Answers
The answers to the following calculations with the proper number of significant figures and with the correct units are: (a) 8.00 kg, (b) 22.6 g, (c) 3.45 cm³
What is significant figures?
Significant figures are a way to express the accuracy of a measurement. They are the digits that are known accurately plus one last uncertain digit. This last uncertain digit is estimated based on the precision of the measuring instrument. Significant figures are used to communicate the precision of a measurement to other scientists. The number of significant figures in a measurement is dependent on the measuring instrument used.
The answer should have two significant figures, since the least precise measurement, 12.90 kg, has two significant figures. The answer should have three significant figures, since the least precise measurement, 0.64 g, has three significant figures. The answer should have three significant figures, since the least precise measurement, 0.859 cm³, has three significant figures.
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Related Questions
The atmosphere can be compared to a
Answers
In an ecosystem , the atmosphere compares to a global blanket surrounding it.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Which particle will complete this reaction
Answers
The particle that will complete this reaction is an isotope of zinc with 30 protons and 64 neutrons.
What is an isotope?Isotopes are described as two or more types of atoms that have the same atomic number and position in the periodic table, and that differ in nucleon numbers due to different numbers of neutrons in their nuclei.
There are two main types of isotopes and they include:
stable isotopes and unstable (radioactive) isotopes.In conclusion, there are 254 known stable isotopes.
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complete combustion of a 1.05 gram sample of the compound witht he soichiometric amound of oxygen gas
Answers
The pressure of the gas mixture when it is contained in a 3.00 liter flask at 127˚C is 0.926 atm.
To calculate the pressure of the gas mixture produced by the combustion of the compound, we can use the ideal gas law PV = nRT.
Given:
P : ?V : 3.00 Ln : moles of gas producedR : 0.08206 L atm K-1 mole-1T : 127 + 273 = 400KWe can calculate the moles of gas produced by the combustion reaction by using the balanced equation for the combustion of the compound with oxygen.
CxHy + (x+y/4) O2 → x CO2 + (y/2) H2OGiven that 1 mole of CO2 and 2 moles of H2O is produced.
Moles of CO2 produced = 1.05 / 44.01 = 0.024 moleMoles of H2O produced = 0.048 moleTotal moles of gas produced = 0.024 + 0.048 = 0.072 moles
Plugging in the values we get:
P = (n * R * T) / V P = (0.072 * 0.08206 * 400) / 3.00 P = 0.926 atmSo, the pressure of the gas mixture when it is contained in a 3.00 liter flask at 127˚C is 0.926 atm.
This question is incomplete and should be provided as:
Complete combustion of a 1.05 gram sample of the compound with the stoichiometric amount of oxygen gas produces a mixture of H2O(g) and CO2(g). What is the pressure of this gas mixture when it is contained in a 3.00 liter flask at 127˚C?Learn more about combustion reaction here: brainly.com/question/13251946
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rank the following compounds in order of decreasing boiling point: potassium bromide ( kbr k b r ), acetylene ( c2h2 c 2 h 2 ), and iodomethane ( ch3i c h 3 i )
Answers
1. Potassium bromide (KBr)
2. Iodomethane (CH3I)
3. Acetylene (C2H2)
The boiling point of a compound is determined by the strength of the intermolecular forces between its molecules. Potassium bromide has the strongest intermolecular forces, as it is an ionic compound composed of positively charged potassium ions and negatively charged bromide ions. These ions are held together by electrostatic forces, which are stronger than the other types of intermolecular forces.
Iodomethane has a higher boiling point than acetylene because it has a polar covalent bond and can form dipole-dipole interactions between its molecules. Acetylene, on the other hand, is a nonpolar compound and only experiences London dispersion forces between its molecules. These forces are weaker than the dipole-dipole interactions in iodomethane.
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assuming that the ideal brayton cycle begins with isentropic compression, put the remaining processes in order so that they complete the closed-loop brayton cycle.
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Assuming that the ideal Brayton cycle begins with isentropic compression, the remaining processes in order to complete the closed-loop Brayton cycle are:
Isentropic ExpansionHeat AdditionIsothermal ExpansionHeat Rejection.The Brayton cycle is a thermodynamic cycle used to model the operation of a gas turbine engine. In the Brayton cycle, a working fluid is compressed, heated, expanded and cooled in a closed loop. The Brayton cycle is an idealized cycle, and in reality the processes are not completely isentropic, isothermal or adiabatic.
The cycle begins with isentropic compression of the working fluid, where the pressure and temperature of the fluid increase. The working fluid is then heated at constant pressure, and the temperature increases further. The working fluid is then expanded isentropically, converting the heat energy into work. The working fluid is then cooled at constant pressure, and the temperature and pressure decrease. Finally, the working fluid is recompressed isentropically, returning it to the original state. The cycle is then repeated.
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Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table.
Mass of weigh boat 1.411 g
Mass of weigh boat and sample 5.853 g
What is the mass of the solid sample (in g)?
Answers
Answer:
The mass of the solid sample is 4.442 g (5.853 g - 1.411 g).
Explanation:
The mass of the solid sample can be determined by subtracting the mass of the weigh boat from the mass of the weigh boat and sample. This is because the weigh boat is a constant and known value, and it is used as a reference to measure the mass of the sample. To find the mass of the sample, we use the formula:
Mass of sample = Mass of weigh boat and sample - Mass of weigh boat
In this scenario:
Mass of sample = 5.853 g - 1.411 g = 4.442 g
Therefore, the mass of the solid sample is 4.442 g.
How many grams of O2 will be formed from 28.9 moles of KCiO3
Answers
Answer:
28.9 moles of KClO3 x (3 moles O2 / 2 moles KClO3) = 43.35 moles of O2
To convert moles to grams, you'll need to use the molar mass of O2, which is 32 g/mol.
43.35 moles x 32 g/mol = 1387.2 g of O2
So from 28.9 moles of KCiO3 , 1387.2 grams of O2 will be formed.
atch the mineral property with its correct description. instructions crystal shape crystal shape drop zone empty. color color drop zone empty. cleavage cleavage drop zone empty. luster luster drop zone empty. fracture fracture drop zone empty. this is a useful, but not always reliable, property; very easily identifiable, but a single mineral may occur in several varieties of this property. this occurs when a mineral has an atomic arrangement that does not contain cleavage planes along which the mineral breaks. a mineral that grows unobstructed by its surroundings can have a distinctive geometric form. this is the way light bounces off a mineral; may be earthy, pearly, metallic, silky, etc. some minerals break in specific ways (along specific planes) because of their internal arrangement of atoms.
Answers
Crystal shape: A mineral with an unhindered growth environment may have a particular geometric shape.Color is an easy-to-identify but not necessarily dependable quality; a single mineral may exist in several
Color may have a significant effect on how we feel and perceive things. It has the power to arouse emotions of warmth or coldness, harmony or discord, and even to affect our hunger and mood. Color is utilised in both design and art to provide contrast, balance, and focus points. Color may be used in branding and marketing to evoke connections, communicate a message, or express an emotion. Color may be categorised and described in a variety of ways, such as by hue, saturation, and value. Design, art, and psychology all benefit from an understanding of colour theory, which is the study of colour and its effects. Millions of distinct
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nitrogen and carbon cycles webquest answers science
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In the nitrogen cycle, nitrogen moves from one sphere to another whereas, in the carbon, cycle carbon moves from one sphere to another.
How does nitrogen affect the carbon cycle?Photosynthesis and decomposition are important procedures of the carbon cycle. nitrogen cycle Fixation, mineralization, nutrition, and denitrification are the major processes of the nitrogen cycle much of the overlap joining the carbon cycle and the nitrogen cycle occurs in the soil
Faster decomposition of organic carbon makes more nitrogen at hand to plants, helping them take in more CO2 as they grow, lessening the atmospheric levels. This is a negative carbon cycle response. The nitrogen cycle is a repeating cycle of operation during which nitrogen moves through both living and non-living things
So we can conclude that mini atoms of carbon and nitrogen can move around the planet through these cycles.
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97 percent of the world's water supply is difficult, if not impossible, to obtain or to use
because it is in the oceans or in the form of glaciers and ice caps. Scientists are exploring
methods of conserving and protecting the rest of Earth's water supply for the growing
population. According to the information provided, which of the following activities most
directly affects the water supply?
A. flushing toilets and bathing
B. drinking and cooking
C. irrigating field crops
OD. producing energy and manufacturing
OE. growing all types of food
Answers
Answer: C
Explanation:
choose the one best response for why you discard clean broken glassware, melting point capillaries, pipets or glass test tubes in the broken glass box and not in the regular trash can.
Answers
If the shattered glassware is not noticed, there could be potential injury to the janitorial crew. So, clean broken glassware, melting point capillaries, pipets or glass test tubes should always be discarded in the broken glass box. So, option C is correct.
This lab safety advice aims to prevent and/or reduce accidents from broken glass when handling lab glassware.
It is acceptable to collect broken glass that is not contaminated with chemicals, infectious elements, or other dangerous items in certified broken glass bins or 5-gallon buckets with covers.
To reduce the chance of getting hurt, always pick up shattered glass with a brush and dustpan, tongs, or forceps and put it into a receptacle meant for throwing away broken glass. Broken glass must never be handled with care and must never be disposed of in regular trash. There are numerous vendors who sell glass disposal boxes. These containers include a plastic liner for disposing of wet glasses and a lid with a built-in cardboard flap to close the container when it is full.
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The complete question is:
Choose the one best response for why you discard clean broken glassware, melting point capillaries, pipets or glass test tubes in the broken glass box and not in the regular trash can.
a) Glassware could still have chemical residues that need to be properly disposed of.
b) If shattered glass is thrown away with regular trash, the stockroom cannot charge for it.
c) If the shattered glassware is not noticed, there could be potential injury to the janitorial crew.
d) Glasses could still contain chemical traces that need to be properly disposed of.
How to calculate and express my answer in one decimal place
Answers
The temperature of the object as it is given in the other unit is 105.1 °F.
What is temperature?Temperature is a measure of the amount of thermal energy or heat in a system.
Now we know that to convert from the Celsius to the Fahrenheit temperature that we have to be able to use the formula;
(T°C × 9/5) + 32 = T°F
Then we have that;
T°C = 40.6
Thus we now have that;
(40.6 × 9/5) + 32 =
= 105.1 °F
Thus the object that we have in the farm is going to have a new temperature that we obtain as 105.1 °F
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given this information, what structure is most likely part of a larger molecule responsible for increasing the rate of the glycolytic pathway in eukaryotes?
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Enzymes like hexokinase and phosphofructokinase catalyze the conversion of glucose to pyruvate in the glycolytic pathway, which speeds up the metabolism.
What are eukaryotes?Eukaryotes are a class of organisms that have membrane-bound organelles and a genuine nucleus. All multicellular species, including animals, plants, and fungi, as well as some single-celled organisms, such as protozoa and algae, are included in this category.
It is likely that the structure, which is most likely a component of a bigger molecule, is what speeds up the glycolytic pathway in eukaryotes. Enzymes are biological catalysts that speed up chemical reactions by lowering the energy needed for the process to start. Enzymes like hexokinase and phosphofructokinase catalyze the conversion of glucose to pyruvate in the glycolytic pathway, which speeds up the metabolism.
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For about 10 years after the French revolution, the French government attempted to base measures of time on multiples of 10. One week consisted of 10 days, one day consisted of 10 hours, one hour consisted of 100 minutes, and one minute consisted of 100 seconds. (Assume that a French decimal day is the equivalent to a regular day.)
What is the ratio of the French decimal week to the standard week?
Answers
The number of standard days is 2460=86400. There are 86400 seconds in a normal second.
Use consist when when?The verb comprise indicates to be made up of or composed of something and is almost typically associated with the preposition "of." Only "yes" and "no" might be used in a contentious exchange. Consist is the term to use when describing anything that is composed of other things. In a molecule, electrons and their bonds are present.
How would you phrase "consists of"?Consist is not a passive verb. ✗ Never mention, "My family consists of four members." be composed of• You state: "My family is composed of four individuals." • You state: "My family is made up of four persons." by means of the progressive
24×60×=86400sone
[tex]\frac{1}{86400}[/tex] days
So, Ratio = [tex]\frac{Standardsecond}{Frenchsecond}[/tex]= [tex]10^{-5}/\frac{1}{86400}[/tex]
= 0.864
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The compound below exhibits one lone pair. Identify the type of atomic orbital that the lone pair occupies. O ap orbital O an sp3 hybridized atomic orbitalO an sp hybridized atomic orbital O an s orbital O an sp2 hybridized atomic orbital
Answers
The type of atomic orbital that the lone pair occupies is an sp² hybridization atomic orbital.
When two atomic orbitals join to generate a hybrid orbital in a molecule, the energy of the individual atoms' orbitals is redistributed to give orbitals of equivalent energy. We refer to this process as hybridization. The atomic orbitals with equivalent energies are mixed together during the hybridization process, which primarily involves the fusion of two s orbitals, two p orbitals, or the mixing of a s orbital with a p orbital or a d orbital. Hybrid orbitals are the new orbitals that are created in this way. More importantly, hybrid orbitals are very helpful in describing the characteristics of atomic bonds and molecular geometry.
sp hybridization
One s and one p orbital in the same main shell of an atom combine to generate two new equivalent orbitals, which is known as sp hybridization. The newly created orbitals are known as sp hybridised orbitals.
It produces 180° angled linear molecules.To create a new hybrid orbital known as a sp hybridised orbital, one's' orbital and one 'p' orbital of equal energy are mixed together in this sort of hybridization.Diagonal hybridization is another name for sp hybridization.Half of each sp hybridised orbital is made up of s and half of it is made up of p.sp² hybridization
Trigonal hybridization is another name for sp2 hybridization.To create the new hybrid orbital known as sp2, one's' orbital and two 'p' orbitals of equal energy are mixed together.Trigonal symmetry was used to generate a mixture of s and p orbitals, which are kept at 1200.The three hybrid orbitals remain in the same plane and are perpendicular to one another by 120 degrees. Each hybrid orbital produced has an's' character of 33.33% and a 'p' character of 66.66%.The triangular planar molecules have a centre atom that is linked to three other atoms and is sp2 hybridised.sp³ hybridization
These form an angle of 109°28' with one another and are pointed at the four corners of a conventional tetrahedron.The sp3 hybrid orbitals are at an angle of 109.280 degrees.25% s character and 75% p character make up each sp3 hybrid orbital.
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predict products and balance H2SO3 (aq) + KOH (aq)
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Potassium sulfite and water are produced in the reaction between sulfuric acid and potassium hydroxide.
What two h2so3 Koh products result from the reaction?
Potassium hydroxide is a substance that is extremely caustic but incombustible. It is widely used in the production of cleaning products, chemicals, and petroleum refinery. Metals and tissue are both corroded by H2SO3. It has a strong burning sulfuric odor and is a clear liquid.
The net ionic equation, the type of reaction, the product of the reaction between H2SO3 and KOH, and other related topics will all be covered in this article.
H2SO3 + KOH has the following net ionic equation:
OH- = K+ O2 SO32
Follow the procedures listed below to get this net ionic equation:
H2SO3, K2SO3, and KOH, which should be ionized, are strong electrolytes in this reaction.
2K+ + OH- + 2H+ SO32 = 2K+ 2SO32 2H+ 2OH
The net ionic equation should be written down after the spectator ions on both sides have been removed.
Following the cancellation of the spectator ions, the net ionic equation is: OH- = K+ + O2- + SO32-.
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The percent of O in Li3PO4 is___% O. (Round to 2 decimal places).
PLEASE HELP
Answers
The mass percent of oxygen in the compound lithium phosphate Li₃PO₄ is its ratio of mass to the total mass i.e., 56 %.
What is mass percent ?Mass percent is a common term used to express the composition and concentration of a compound. The mass percent of an element in a compound is the ratio of its mass in that compound to the total mass of the compound multiplied by 100.
The molar mass of the compound Li₃PO₄ = 113 g
(P = 31 g/mol, Li= 6 g/mol, O= 16 g/mol .)
Atomic mass of O = 16 g/mol
mass of 4 oxygen = 64 g.
Mass percent of O in the compound = mass of 4 O/total mass
mass % = 64 g/113 g × 100 = 56%.
Therefore, the mass percent of oxygen in the compound is 56%.
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At 25° C and normal atmospheric pressure, the density of air is 1.19 g/L. What is the mass
of air in kilograms of the air in a room that is 28.0 ft x 32.0 ft x 9.5 ft tall?
Answers
The mass of air with the given specification in kilograms of the air in a room is 286.0165 kg/m³.
What is the mass flow of air?A huge volume of atmospheric air that is largely uniform in temperature and moisture is known as an air mass. Air masses can travel tens of thousands of kilometers in any direction and go as high as the stratosphere. The unit of dynamic mass per time known as mass flow is grams per minute (g/min). It is possible to calculate an exact mass flow by comparing a volumetric flow (cm3/min) to its known temperature and pressure.
Given:
Convert the units of feet into meters:
1 foot=12 inches, 1inch-2.54 cm, 100 cm=1m
28.0 feet = 8.5344 m
32.0 feet = 9.753 m
9.5 feet = 2.895 m
Volume= 8.53 × 9.75 × 2.89 or 240.35 m³
mass of air= 1.19g/0.001 m³ × 240.35 or 286.0165 kg/m³
mass of air = 286.0165 kg/m³
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which of the following substituents are meta directors? select all that apply. group of answer choices co2et h nh2 no2 oh cl ch3 cf3
Answers
The substituents that are meta directors are NO₂, Cl and CF₃.
In electrophilic substitution reactions in aromatic compounds, the position of the substituent on the ring can affect the rate and outcome of the reaction. Substituents can be classified as ortho, meta, or para directors, depending on their ability to direct the electrophile to specific positions on the ring. Substituents that are meta directors, like NO₂, Cl, and CF₃, have a moderate effect on directing electrophiles to the meta position (the position adjacent to the substituent) on the ring. They have a weaker effect than ortho-para directors but stronger than ortho directors.
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When determining the specific heat from a given metal in a calorimeter the mass of the water remains constant, but the mass of the metal is increased what would happen to the equilibrium temperaturea. not changeb. increasec. decrease
Answers
When determining the specific heat from a given metal in a calorimeter the mass of the water remains constant, but the mass of the metal is increased and the equilibrium temperature will b) increases.
The metal is able to conduct or transfer the more heat into the water. If we put the higher massed object into the water as compared to the metal and it will more heat than the smaller piece of metal .
The higher the mass of metal, the more will be the heat. The more will be the heat will metal conducted, and it will increase the temperature of the water, this makes the equilibrium temperature increases.
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A student has four pieces of a substance in different shapes and sizes. The student wants to determine the density of the substance. Which of the following procedures would yield the most accurate data?
Place the pieces on a mass balance, one at a time and record the mass of each. Submerge the pieces one at a time in a graduated cylinder filled with a volume of water and record the volume change.
Place a beaker on a mass balance and tare the balance. Place the pieces in the beaker and record the mass, then add just enough water to the beaker to cover the pieces and record the volume of added water.
Fill four beakers with fluids that have different densities. Place a different piece in each beaker and record whether it sinks or floats.
Fill four beakers with fluids that have different densities. Place one of the pieces into each beaker and record whether it sinks or floats. Repeat with the remaining three pieces.
Answers
A student has four pieces of a substance in different shapes and sizes , place the pieces on a mass balance, one at a time and record the mass of each. Submerge the pieces one at a time in a graduated cylinder filled with a volume of water and record the volume change.
A mass balancing is a method of accounting for all of the materials used in a process. The input, output, as well as distribution of a substance amongst streams in such a process or stage are all considered in mass balance.
Mass balancing is a crucial method for phasing out fossil raw materials on a broad scale, with both the goal of achieving a fully transformed chemical industry. Mass balance facilitates a gradual transition to using recycled and/or renewable feed supply.
Therefore, the correct answer will be option (a).
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Which property of matter is conserved in chemical reactions and shown by balanced equations?
mass
volume
density
shape
Answers
Mass is conserved in chemical reactions and shown by balanced equations.
What is mass?
Mass is a property of matter that describes the amount of matter in an object. It is related to the amount of atoms, molecules, or ions that are present in an object. Mass is often measured in kilograms or grams. Different substances have different masses, due to their different chemical compositions. Mass is an important property in chemistry, as it is used to calculate the amount of a certain substance that is present in a given volume.
Therefore, Mass is conserved in chemical reactions and shown by balanced equations.
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Question 12 of 25
Most scientists use scientific methods in which of the following orders?
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Answer:
Observation and description of a phenomenon or group of phenomena
Formulation of a hypothesis to explain the phenomena
Use of experimentation and/or other forms of data collection to test the hypothesis
Analysis and interpretation of the data collected
Development of a theory or revision of the hypothesis based on the evidence
Repeat the experiment to ensure the results are consistent
Communicate the results to other scientists to have them verify the results.
Explanation:
calculate to three significant digits the density of dinitrogen difluoride gas at exactly and exactly . you can assume dinitrogen difluoride gas behaves as an ideal gas under these conditions.
Answers
The density if the dinitrogen difluoride gas at the temperature of 30 °C and the pressure of exactly 1 atm is 2.6 g/L.
Given that :
The temperature = 30 °C
The pressure = 1 atm
The ideal gas equation is given as :
P V = n RT
Density = mass / volume
d = m / V
n = mass / molar mass
P V = (d V / M) R T
d = P M / R T
d = (1 × 66) / ( 0.082 × 303)
d = 2.6 g/L
Thus, the density is 2.6 g/L.
This question is incomplete, the complete question is :
Calculate to three significant digits the density of dinitrogen difluoride gas at exactly 30 °C and exactly 1 atm. You can assume dinitrogen difluoride gas behaves as an ideal gas under these conditions
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your european friends tell you they are pleased because their new car gives them 15 kilometers per liter of fuel. translate this into miles per gallon so you can decide whether to be impressed. use the conversion factors that one mile is 1.6 km and one gallon is 3.8 liters.
Answers
The conversion of 15 kilometers per liter of fuel into miles per gallon is 35.6 miles/ gallon.
Given that :
1 miles = 1.6 km
1 gallon = 3.8 liters
The conversion of 15 kilometers per liter to miles per gallon given as follows:
(15 kilometers / liter) × ( 1 liter / 1.6 gallon)
= (9.375 kilometers / gallon) × ( 3.8 kilometers / 1 mile )
= 35.625 miles / gallon
Thus, the conversion of kilometer in miles is 35.6 miles/ gallon , if Europeans friends tell you that they are pleased because the new car gives them 15 kilometers per liter of fuel.
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an air bubble of 5 cm3 volume is at the bottom of a lake 35 m deep, where the temperature is 4oc. the bubble rises to the surface, which is at a temperature of 20oc. take the temperature of the bubble to be the same as that of the surrounding water and find its volume just before it reaches the surface. you can treat the air in the bubble as an ideal gas.
Answers
The bubble's volume right before it reaches the surface is 23.6 cm³, and let's assume that its temperature is the same as the surrounding water's. You can think of the bubble's air as an ideal gas.
n=p₁V₁/RT₁=(p₀+ρgd)V₁/RT₁
p₁/RT₁=p₂V₂/RT₂
∴V₂=p₁V₁T₂/p₂T₁=(p₀+ρgh)V₁T₂/p₀T₁
= (1.01×10⁵+10³×10×35)(5)(273+20)/1.01×10⁵(273+4)
=23.6 cm³
A theoretical gas called an ideal gas is one that has lots of point particles flying around arbitrarily and not being affected by other particles. The ideal gas notion is advantageous because it complies with the ideal gas law, a condensed equation of state, and is amenable to statistical mechanics analysis. It is frequently possible to loosen the need for zero interaction, for instance, if the interaction is totally elastic or is thought of as point-like collisions.
Many real gases behave qualitatively like an ideal gas, where the gas molecules (or atoms for monatomic gases) take on the function of the ideal particles, under varied conditions of temperature and pressure. Numerous gases, including air mixes and heavier gases including carbon dioxide, nitrogen, oxygen, and hydrogen.
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which of the following are examples of sampling bias? select all that apply. 1 point a national election poll only interviews people with college degrees. a clinical study includes three times more men than women. a survey of high-school-age students does not include homeschooled students. an online marketing analytics firm stores data in a spreadsheet.
Answers
Option 1 , 2 & 3 are examples of sampling bias. Sampling bias refers to a systematic error that occurs when a sample is not representative of the population from which it is drawn.
Sampling bias refers to a systematic error that occurs when a sample is not representative of the population from which it is drawn. This can happen in a number of ways, but in general, it occurs when the sample is not chosen randomly or when certain groups are underrepresented or overrepresented in the sample.It's important to be aware of these types of sampling bias when designing a study and interpreting the results because they can lead to inaccurate conclusions. To minimize sampling bias, researchers should use random sampling techniques and strive to include a representative sample of the population in their study.
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directions: each of the following questions or incomplete statements is accompanied by five suggested answers or completions. select the one that best answers the question or completes the statement.
Answers
A: The biodiversity of the pond has decreased.
B: The species richness
What is BiodiversityBiodiversity is all life on this earth including plants, animals, fungi and microorganisms as well as the various genetic materials they contain and the diversity of the ecological systems in which they live. This includes the relative abundance and genetic diversity of organisms from all habitats, whether on land, sea or other aquatic systems.
Biodiversity can be classified into three levels:
a. Species diversity
Species or types have the meaning, individuals who have morphological, anatomical, physiological similarities and are able to interbreed with each other (inter-hybridization) which produce fertile offspring to continue their generation.
Another example is the diversity of species in coconut trees, palm trees, areca palm trees and also in palm trees.
b. Genetic diversity
Gene diversity is the diversity of individuals within one type of living thing. Gene diversity results in variations between individuals of the same kind. Examples of diversity at this gene level are white roses, red roses, and yellow roses which have differences, namely different in terms of flower color.
c. Ecosystem diversity
Ecosystem can be interpreted as a relationship or mutual interaction between one living thing and another living thing and also between living things and their environment. Every living thing will only grow and develop in a suitable environment.
Your question is incomplete but most probably your full question was:
Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case.
A) A one-hectare pond is sampled in early September. The sample yields 1 small catfish as well as 17 benthic invertebrates that represent 10 species. If the pond is resampled a year later, which of the following would best indicate that the pond had been adversely affected by adjacent development?
B) A one-hectare pond is sampled in early September. The sample yields 1 small catfish as well as 17 benthic invertebrates that represent 10 species. Which of the following can be estimated from the sample for the invertebrates in the pond?
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Move to the safety shower if you spill hazardous chemicals on your ________Stand under the shower and _________ the lever. Remove clothing and continue flushing the area for _________
Answers
Move to the safety shower if you spill hazardous chemicals on your skin. Stand under the shower and pull the lever. Remove clothing and continue flushing the area for at least 20 minutes.
If you get hazardous chemicals on your skin, you should go to the nearest safety shower right away.
In the event of a spill, the safety shower is a device that is specifically designed to flush chemicals from the skin and clothing.
When you reach the safety shower, stand beneath it and pull the lever to turn on the water flow.
It is critical to remove any contaminated clothing while showering to ensure that all of the chemicals are washed away.
Flush the affected area for at least 20 minutes to ensure that all chemicals have been removed. It is critical to follow these procedures to reduce the risk of injury or chemical exposure.
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Sharla finds a container labeled tungsten. She removes the metal and weighs it and determines the mass is 377.64 grams of tungsten. How many moles of tungsten did she find?
Answers
The number of moles in 377.64 grams of tungsten is 2.005 moles.
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass as follows:
no of moles = mass ÷ molar mass
According to this question, Sharla finds a container labeled tungsten. She removes the metal and weighs it and determines the mass is 377.64 grams of tungsten.
Molar mass of tungsten = 183.84g/mol
moles = 377.64g ÷ 183.84g/mol
moles = 2.005 moles
Therefore, 2.005 moles is the number of moles in 377.64g of tungsten.
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