Answer:
Mass of the water = 0.1kg is 100g
Explanation:
Mathematically;
Quantity of heat = mass of water * specific heat capacity * temperature change
From the question, we identify the following;
Quantity of heat = 6.3 KJ
1 KJ = 1000 J, so 6.3 KJ = 6.3 * 1000 = 6300 J
Mass of water = ?
Specific heat capacity = 4200
Temperature change is the difference between the final and initial temperature. = 75-60 = 15
6300 = m * 15 * 4200
63 = m * 15 * 42
63 = 630 m
m = 63/630
m = 0.1 kg
The density of ice is 917 kg/m3. The density of salt water is 1029 kg/m3. A mass of ice is 2.55 x 1013 kg. Calculate the volume of salt water that has the same mass as 278 km3 of ice.
Answer:
247 km3
Explanation:
Density =mass /volume
Volume =mass /density
Mass=density * volume
278km3 =2.78*10 5 m3
917 * (2.78*10 5) = 254,926,000
=2.54926 *10 8 kg
(2.54926 * 10 8)/ 1029 kg/m3
=2477414966m3
247.74 km3
2.4774 * 10 2 km3
A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound?
Answer:
mass of carbon = 0.438g
Explanation:
mass percentage = 0.00438%
Answer :
43.8% on edge
hope this helps and good luck!
What biological sample do home pregnancy tests use to detect pregnancy?
Answer:
The biological sample that pregnancy tests use to detect pregnancy is urine
Answer:
yes
Explanation:
the urine in the the tester will find hormones to determine if pregnant or not
what happens to water as it freezes? i know the answer is either b or c, but i’m not sure which one it is :(
Answer:
The answer is B
Explanation:
When water freezes, the temperature decreases and therefore, the average kinetic energy will decrease as well.
which elements gain electrons more easily and why?
Answer: Elements that are close to noble gas configuration (basically meaning elements w/ high electronegativity)
Explanation:
For Example: Elements in Group 17(halogens) because they are highly electronegative, meaning it would gain electrons easily. All elements want to be a "noble gas" in terms of getting a full valence shell, therefore, the answer is so.
Look at Seaweedtea's answer, more in depth
Answer:
Non-metal elements (such as oxygen, nitrogen, fluorine, chlorine etc, *except noble gas) gain electrons more easily compared to metals and semi-metals.
All groups from Group IV to Group VIII gain electrons, specifically, group VII (7) gain electrons most easily. This group is called halogens, which includes fluorine, chlorine, bromine etc.
Atoms of elements tend to become octet by having 8 outermost shell electrons, (or 2 if there's only 1 electron shell- which is called duplet), because thats where they are the most stable. Since non-metals can become octet/duplet easier by gaining fewer electrons rather than losing more of the already existing electrons, they have a higher tendency to gain electrons.
In halogens, they already have 7 outermost shell electrons, so they only need 1 more to have 8, so they gain electrons more easily. They would not lose 7 electrons.
Same for oxygen, for example. The atoms have 6 outermost shell electrons already, so they only need to gain 2 to become octet.
We would like to make a golden standard kilogram in the shape of circular cylinder. The density of gold is 19.32 g/cm3. a) Find the volume of the kilogram standard of gold in cubic meter. b) In order to minimize the effect of surface contamination, the height of this golden standard kilogram is equal to its diameter. Find the height of this golden standard kilogram in mm.
Explanation:
a) Using the provided information about the density of gold, the sample size, thickness, and the following equations and comersion factors, find the area of the gold leaf:
[tex]V=l \cdot w \cdot h=A \cdot h\\m=\rho \cdot V[/tex]
Gold [tex]_{\rho}=19.32 \mathrm{g} / \mathrm{cm}^{3}[/tex]
[tex]1 \mu=10^{-6} \mathrm{m}[/tex]
First, find the volume of the sample and then find the area of the sample.
[tex]V=\frac{m}{\rho}=\frac{27.6 \mathrm{g}}{19.32 \mathrm{g} / \mathrm{cm}^{3}} \cdot\left(\frac{0.01 \mathrm{m}}{1 \mathrm{cm}}\right)^{3}[/tex] [tex]=\frac{1.429 \times 10^{-6} \mathrm{m}^{3}}[/tex]
[tex]V=A \cdot h \rightarrow A=\frac{V}{h}=\frac{1.429 \times 10^{-6} \mathrm{m}^{3}}{10^{-6} \mathrm{m}} \approx 1.429 \mathrm{m}^{2}[/tex]
b. Using the provided information from part [tex]a[/tex] ), the radius of the cylinder, and the following equation for the volume of a cylinder, find the length of the fiber :
[tex]V=\pi r^{2} h \rightarrow h=\frac{V}{\pi r^{2}}[/tex]
[tex]h=\frac{1.429 \times 10^{-6} \mathrm{m}^{3}}{\pi \cdot\left(2.5 \times 10^{-6} \mathrm{m}\right)^{2}} \approx 72778 \mathrm{m}[/tex]
For each of the compounds, find the length of the longest carbon chain in the box provided.
CH,
CH3 -CH2-CH2-CH2-CH-CH2-CH2 - CH2 - CH3
CH,CH,CH,
HC
CH-CH2-CH3
CH,CH.CHCCH,CH,CH,
1
CH2
H.C CH.CH
CH3
<
Answer:
In First compound the longest chain contains 7 C atoms.
In the Second compound the longest chain contains 9 C atoms.
In the Third compound the longest chin contains 7C atoms.
Explanation:
In first compound the longest chain contains 7 carbon atoms.In the second compound the longest chain contains 9 carbon atoms.In the third compound the longest chin contains 7 carbon atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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A flexible container at an initial volume of 6.13 L contains 6.51 mol of gas. More gas is then added to the container until it reaches a final volume of 18.3 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
Answer:
the final mole of the flexible container = 12.92 moles
Explanation:
Given that :
initial volume of a flexible container = 6.13 L
initial mole of a flexible container = 6.51 mol
final volume of a flexible container = 18.3 L
final mole of a flexible container = ???
Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
Therefore,
[tex]n= \dfrac{V_2*n_1}{V_1}[/tex]
[tex]n= \dfrac{18.3*6.51}{6.13}[/tex]
n = 19.43
[tex]n=n_1+n_2[/tex]
19.43 = 6.51 + n₂
n₂ = 19.43 - 6.51
n₂ = 12.92 moles
Thus; the final mole of the flexible container = 12.92 moles
A 75 lb (34 kg) boy falls out of a tree from a height of 10 ft (3 m). i. What is the kinetic energy of the boy when he hits the ground? Round your answer to the nearest joule. ii. What is the speed of the boy when he hits the ground? Round your answer to two significant figures. iii. Using the conversion factors of 1 m = 1.094 yd and 1 mi = 1760 yd, calculate the speed of the boy in miles per hour when he hits the ground.
Answer:
Kinetic energy of boy just before hitting the ground is [tex]\approx[/tex]1000 J.
Speed of boy just before hitting the ground is 7.67 m/s
or 17.16 mi/hr.
Explanation:
Given that:
Mass of boy = 75lb = 34 kg
Height, h = 10ft = 3m
To find:
Kinetic energy of boy when he hits the ground.
As per law of conservation of energy The potential energy gets converted to kinetic energy.
[tex]\therefore[/tex] Kinetic energy at the time boy hits the ground = Initial potential energy of the boy when he was at the Height 'h'
The formula for potential energy is given as:
[tex]PE = mgh[/tex]
Where m is the mass
g is the acceleration due to gravity, g = 9.8 [tex]m/s^2[/tex]
h is the height of object
Putting all the values:
PE = [tex]34 \times 9.8 \times 3 \approx 1000\ J[/tex]
Hence, Kinetic energy is [tex]\approx[/tex]1000 J.
Formula for Kinetic energy is:
[tex]KE = \dfrac{1}{2}mv^2[/tex]
where m is the mass and
v is the speed
Putting the values and finding v:
[tex]1000 = \dfrac{1}{2}\times 34 \times v^2\\\Rightarrow v^2 = 58.82\\\Rightarrow v = 7.67\ m/s[/tex]
Given that:
1 m = 1.094 yd and 1 mi = 1760 yd
[tex]\Rightarrow 1609\ m = 1\ mi[/tex]
Converting 7.67 m/s to miles/hour:
[tex]\dfrac{7.67 \times 3600}{1609}=17.16\ mi/h[/tex]
copper is heated in air it reacts with oxygen of air to form a black compound copper oxide in chemical equation
Answer:
Yes
Explanation:
copper is heated in air it reacts with oxygen of air to form a black compound
Two oxide of sulphur,A and B were analyzed and the results obtained showed that in oxide A,3.50g of sulphur combined with 6.00g of oxygen and in oxide B,2.80g of sulphur combined with 9.55g.Show that this result illustrate the law of multiple proportion
Answer:
See Explanaton
Explanation:
The law of multiple proportions states that when two same elements form more than a compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers.
Oxide A
3.50g of sulphur combined with 6.00g of oxygen
Oxygen:Sulphur = 6 : 3.5
Oxide B
2.80g of sulphur combined with 9.55g
Oxygen : Sulphur = 9.55 : 2.8
Therefore:
The ratio of Oxygen to Sulphur in Oxides A and B is:
[tex]\dfrac{\text{Oxygen}}{\text{Sulphur}} \implies \dfrac{6}{3.5}:\dfrac{9.55}{2.8} = \dfrac{1.7}{1}:\dfrac{3.4}{1}=1:2[/tex]
Ratio of Oxygen=1:2
There is exactly twice in Oxide B as in Oxide A.
This result illustrates the law of multiple proportions.
HELP Which statement describes an effect of large asteroid and comet impacts? They may cause continents to move. They may cause small craters on Earth’s surface. They may cause changes limited to within the crater. They may kick up dust and pollute Earth’s atmosphere.
Answer: D
Explanation:
The statement that describes the effect of large asteroid and comet impacts is they may kick up dust and pollute Earth’s atmosphere. The correct option is D.
What are asteroids?
Asteroids are the small, big rocks that are made up of dust, and rocks. They orbit the sun and are smaller than a planet. An asteroid hits the earth like 65 million years ago. When asteroids and comets hit the earth's surface, they create large or small craters.
Comets are small or large snowy balls of gases. They are made up of rocks, and dust, and they orbit the sun. They orbit the sun. A comet has three parts, a nucleus, a comma, and a tail. When it comes near the sun, it converts into a burning ball of gases.
Thus, the correct option is D. They may cause small craters on Earth’s surface.
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which acid is the strongest
Answer:
carborane
Explanation:
Carborane acid is the strongest acid in the word. It is minimum 1 million times stronger or harder than 100% sulfuric acid with respect to Hammett acid feature
The pH value of the carborane is -18. Plus it is noncorrosive as it would be handled with bare skin
Therefore in the given case, the carborane is the strongest acid among all available ones
Which is one way that analyzing ice benefits scientists who study ancient climates? Scientists can analyze frozen volcanic dust to help predict eruptions. Scientists can drill deep into the ice to collect ice cores. Scientists can use pollen grains in ice to make inferences about the climate area. Scientists can study tree rings in ice to learn more about past climates.
Answer:
The correct option is;
Scientists can drill deep into the ice to collect ice cores which contain trapped atmospheric gases
Explanation:
The study of past climates also known as paleoclimatology, is accomplished by acquiring information from proxy data sources which are physical environment characteristics that are preserved through time to remake the conditions of past climate
Past physical environmental characteristics, from which information about ancient climate can be gained are stored in nature's climate variability records including, ice cores, rings in tree stems, fossil pollen, sediments found in the waters of the ocean
The proxy sources provide a means of understanding the conditions of ancient climate before advent of climate measurement.
Therefore, one way that analyzing ice benefits scientists who study ancient climates is that scientists can drill deep into the ice to collect ice cores which contain trapped atmospheric gases from past climates.
Answer: B: Scientists can study the layers of ice cores to gather information about past atmospheric composition.
Explanation: Got it right on a test!
which of the following us not a property of salt in the ionic and covalent properties lab
Explanation:
I think Low melting point
because NaCl (salt has mp 801 degC)
Water has mp 0 degC
what is the molar mass of magnesium tartrate
Answer:
172.385 g/mol
Explanation:
Magnesium Tartrate is C4H4MgO6
C - 12.01 g/mol
H - 1.01 g/mol
Mg - 24.305 g/mol
O - 16.00 g/mol
12.01(4) + 1.01(4) + 24.305 + 16(6) = 172.385 g/mol
Answer:
172.38
Explanation:
[tex]C_4H_4MgO_6\\C=12.01\\H=1.01\\Mg=24.30\\O=16.00\\\\4(12.01)+4(1.01)+24.30+6(16.00)\\48.04+4.04+24.30+96\\=172.38[/tex]
C = 12.01
H=1.01
Mg=24.30
O =16.00
4(12.01)+4(1.01)+24.30+6(16.00)
48.04 +4.04+24.30+96
=172.38
What was done to the linear parent function, f(x) = x, to get the function
g(x) = 1/6 x
Answer:
Vertically Shrunk by a factor of 1/6
Explanation:
Parent Formula: f(x) = a(bx - c) + d
a - vertical shrink/stretch and x-reflections
b - horizontal shrink/stretch and y-reflections
c - horizontal movement left/right
d - vertical movement up/down
Since we are only modifying a, we are dealing with vertical shrink/stretch:
Since a < 1 (1/6 < 1), we are dealing with a vertical shrink of 1/6.
Since a > 0 (1/6 > 0), we do not have a reflection over the x-axis.
Answer:Vertically compressed by a factor of 6
Explanation:
While hiking in the mountains, a scientist sees a unique flower. What is the
best way for the scientist to share this observation with another scientist for
the purpose of identifying the plant?
O
A. The scientist can memorize the flower's appearance.
B. The scientist can take and email a photograph of the flower.
C. The scientist can cut off a tiny piece of the flower to examine
using a microscope.
O
D. The scientist can use a tape measure to make precise
measurements of the flower.
Answer:
B or C seem most appropriate
Explanation:
Memorising the apperaranve of a unique flower, is not the best easy to prove something, because you could have just seen the description in a book, and it is least likely you will be believed.
Its B for apex users 100% correct
If a substance undergoes electrolysis and a brown solid forms on one electrode and a gas on the other, from this we can conclude the original substance must have been: a. An element b. A compound c. A mixture
Answer:
b. a compound.
Explanation:
Electrolysis is described as a mechanism in which ionic compounds are decomposed into their elements by transmitting a direct electric current via the compound in a liquid state. At the cathode, the cations are reduced and anions at the anode are oxidized. There is an exchange between ions and atoms in the electrolysis process caused by the addition or removal between electrons from the external circuit. As per the question, the original substance is a compound because the electrolysis method is used to obtain pure elements from their respective compound.
Which is one way that a short-term environmental change will most likely affect organisms within an ecosystem? A)It will lead to larger populations. B)It will lead to speciation. C)It will lead to adaptation. D)It will lead to forced migration.
Answer:
D)It will lead to forced migration.
Explanation:
Forced migration is an involuntary, sudden movement of organisms from one geographical location to another. This is often in response to short term environmental changes such as drought, famine, etc
When an ecosystem suddenly comes under stress due to these short term environmental changes, organisms may not be left with any other choice but to move or go to new locations in the quest for survival. The organisms may not have left the ecosystem in the absence of such short term ecological stress. This is what is meant by forced migration.
Answer:
D forced migration
Explanation:
Balance the chemical equations
Answer:
Explanation:
1). Ca(NO₃)₂ + KI → CaI + K(NO₃)₂
This equation is incorrect.
When Ca⁺⁺ reacts with I⁻, final product is CaI₂
And when K⁺ react with NO₃⁻, final product is KNO₃
Hence the equation will be,
Ca(NO₃)₂ + KI → CaI₂ + KNO₃
Now we have to balance this equation.
Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃
↓
Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃
2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂
This equation is incorrect,
Since the reaction of Ca⁺⁺ with OH⁻ gives the final product Ca(OH)₂
And final product of K⁺ and NO₃⁻ is KNO₃
Therefore, the equation will be,
Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃
Now we will balance this equation by changing the coefficients of the molecules until the number of atoms on both the sides become equal.
Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃
↓
Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃
3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂
This equation is incorrect,
Since the reaction of Na⁺ and NO₃⁻ gives the final product NaNO₃.
Therefore, the correct equation will be,
Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃
This equation is in the balanced form.
which of the following is an indication that Bill is listening carefully during his conflict resolution process ?
A) He is taking lot’s of notes .
B) He is listening passively .
C) He is correcting mistakes immediately .
D) He is avoiding eye contact studiously .
Answer:
A) He is taking lot’s of notes.
Explanation:
Conflict resolution refers to the process that helps the two parties involved in a communication to turn towards a peaceful resolution when a dispute arises. Conflicts are very obvious to occur among the people working together. Around the professional world, conflicts may emerge among the co-workers, supervisors, and among the management team. The process that helps to resolve the issues is termed to be the conflict resolution process.
In the given situation, the conflict resolution process of resolving the issue would be option A. All the other options would lead towards the emergence of conflict or misunderstanding respectively.
Answer:
A.
He is taking lots of notes.
Explanation:
I took the practice on edge.2020
The amount of stored chemical energy is what determines the temperature of a substance.
Answer:
False
Explanation:
Temperature is also heat energy, so chemical energy has no affect over it.
Answer:
False
Explanation:
The chemical energy in a substance is determined by the potential energy of the bonds of the products formed when it reacts.
Identify the correct statement regarding the strength of chemical bonds.
Weak bonds require more surface area to form than strong bonds.
A weak bond forms from a smaller change in energy compared to a strong bond.
Strong bonds occur with high temperature and weak bonds with low temperature.
Weak bonds require more heat to form than strong bonds.
Answer:
B.
Explanation:
A weak bond forms from a smaller change in energy compared to a strong bond.
Which title is most appropriate for this table? ANSWERS: Uses of Functional Groups Involving Oxygen Natural Sources of Functional Groups Involving Oxygen Uses of Functional Groups Involving Halides and Amines Natural Sources of Functional Groups Involving Halides and Amines
Answer:
Uses of Functional Groups Involving Oxygen
Explanation:
From the table given above, we obtained the following:
1. The functional group of each compound contains oxygen.
2. The table shows the uses of each compound.
From the observations made above, we can say that the most appropriate title for the table is:
Uses of Functional Groups Involving Oxygen.
Answer:
A.Explanation:
first guy is right give him brainliest
Draw the structure of
CH3CH2CH2CH2CH2CHCH2
Explanation:
the last CH2 should CH3
because the first and last carbons are bonded to three hydrogens
Phloem contains specialized cells that move sugars and other nutrients both
up and down in plants. Which object is the best model of one of these cells?
A. Water balloon
Answer:Drinking straw
Explanation: my quiz said so
The object that represents the best model of one of the phloem cells is the drinking straw.
What is Phloem?Phloem may be defined as a type of vascular tissue in plants that significantly conducts the passage of sugars and other metabolic products from the leaves to the roots. This mediates the migration of sugar which is synthesized in the leaves during photosynthesis.
Apart from this, the phloem also regulates the movement of nutrients from the roots to the upper part of the body. This function of phloem cells shares homology with the object known as a drinking straw that mediates the transport of any fluid in both directions.
Therefore, a drinking straw is an object that represents the best model of one of the phloem cells.
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Your question seems incomplete. The most probable complete question is as follows:
Can openerWater balloonDrinking StrawKitchen strainerA 0.200 g sample of unknown metal x is dropped into hydrochloride acid and realeases 80.3 mL of hydrogen gas at STP using ideal Gas law the number of miles of the unknown is
Answer:
The number of mole of the unknown metal is 3.58×10¯³ mole
Explanation:
We'll begin by calculating the number of mole hydrogen gas, H2 that will occupy 80.3 mL at stp.
This is illustrated below:
Recall:
1 mole of any occupy 22.4L or 22400 mL at stp.
1 mole of H2 occupies 22400 mL at stp.
Therefore, Xmol of H2 will occupy 80.3 mL at stp i.e
Xmol of H2 = 80.3/22400
Xmol of H2 = 3.58×10¯³ mole
Therefore, 3.58×10¯³ mole of Hydrogen gas was released.
Now, we can determine the mole of the unknown metal as follow:
The balanced equation for the reaction is given below:
X + 2HCl —> XCl2 + H2
From the balanced equation above,
1 mole of the unknown metal reacted to produce 1 mole of H2.
Therefore, 3.58×10¯³ mole of the unknown metal will also react to produce 3.58×10¯³ mole of H2.
Therefore, the number of mole of the unknown compound is 3.58×10¯³ mole.
mention gay-lussac's law of combining volumes
Answer:
When volume is kept constant (kept the same), Gay-Lussac's law states that the pressure of gas varies directly with the temperature of the gas. The equation would be [tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex], Where P is the pressure (in atm) and T is the temperature (in K°).
Explanation:
Answer:
When volume is kept constant (kept the same), Gay-Lussac's law states that the pressure of gas varies directly with the temperature of the gas. The equation would be , Where P is the pressure (in atm) and T is the temperature (in K°).
Explanation:
Explain the work energy theorem including the direction energy moves and how it relates to positive and negative work
Answer and Explanation:
The working-energy theorem defines work as the energy change brought on by the velocity change. The environment has acted on the object and it increases the energy of the object. When an object's velocity decreases, the object has worked on the world, and the object's energy decreases.
Unless the displacement is in the reverse direction and the force applied, then the work performed is negative. If the displacement is in the same direction and the force applied, then the work performed is positive.
Answer:
Work is the change in energy brought about by a change in velocity.
When the velocity of an object increases, the environment has done work on the object and the energy of that object is increased.
When the velocity of an object decreases, the object has done work on the environment and the energy of the object is decreased.
Explanation: