Answer:
The answer is 2.91 atm
Explanation:
How did mossely esablish a more accurate periodic table
Explanation:
arranged by their number of protons rather than their atomic mass
The prophet Isaac was chosen to lead the Israelites after the death of Abraham.
O True
O False
Give reasons for : The empirical and molecular formulas of methane gas (CH4) are
identical.
Answer:
Because in methane atoms of carbon and hydrogen are present in simplest ratio of 1:4 that can not be simplified further in whole number so its Emperical formula is same as molecular formula.
Explanation:
Define covalent bond.
Can someone please help me
Which of the following is NOT one of the four pieces of evidence Wegener
used to validate his continental drift hypothesis?
Current global warming trends
O Apparent fit of the continents as a "puzzle"
O Past climate of the Earth seen in glaciers
O Correlation of fossils
Correlation of rocks and mountains
If you wanted to take a solid nugget of silver and make it flow so that it can be shaped, how could you do it? you could...
Answer:
It should be heated
Explanation:
To change the solid nugget of silver to liquid so that it can be shaped, the solid mass should be heated to the melting point.
This change is a phase change from solid to liquidWhen the melting point of a substance is reached, the fixed lattice structure collapses. This allows for the particles to slide and flow relative to one another.Therefore a phase change from solid to liquid is attained by heating of the solid to melting point.
Which of the following accurate describes the atmospheric conditions required for the formation of clouds
Answer:
To make a cloud, air needs only to be cooled to saturation and beyond. ... Usually the water vapor amounts in air are less that this amount. When this is the case, we describe the air as being unsaturated. If we add more vapor to such air, we could reach the maximum for the temperature
Explanation:
The atmospheric conditions required for the formation of clouds are , air needs only to be cooled to saturation and beyond formation of clouds and precipitation.
What is precipitation?
Precipitation is defined as any liquid or frozen water which forms in the atmosphere and then gets received on Earth.It is one of the most important steps of the water cycle.
Precipitation takes place in form of clouds when water vapor gets accumulated in clouds and they get bigger and heavy, when the clouds become heavy enough they fall to the land in the form of rain.f a cloud is present at higher altitudes , the water present in the clouds freezes and fall to the ground in form of snow,hail.
Precipitation occurs always in case of fresh water because the sea salt does not evaporate with the water.The different types of precipitation are rain, drizzle,snow,snow hail,etc.
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HELP ASAP - How much energy is lost when 80.0 grams of steam at 100.C turns into liquid water at 100.C?
Answer:
Q = 43,000 calories = 180,000 joules = 180 Kilojoules
Explanation:
Heat flow for phase change can be defined as Q = m·ΔHv
ΔHv = Heat of Vaporization for water = 540 calories/gram = 2259 joules/gram = 2.259 Kilojoules/gram
m = mass of object of interest ( in this problem 80 grams steam 100°C converting to 80 grams of water at 100°C
Q = m·ΔHv = 80g x 540 cals/g =43.200 calories x 4.184 joules/cal = 180,748.8 joules (calculator answer) => 180,000 joules (2 sig. figs.) = 180 Kj
What are some molecular compounds that we use in everyday life and their products?
Ex: Kirkland water - dihydrogen monoxide; H2O
Answer:
Water. Chemical Formula: H2O.
Table Salt. Chemical Formula: NaCl.
Sucrose (Sugar) Chemical Formula: C12H22O11.
Soaps. Chemical Formula: RCOO–Na, Where R is a long chain of carbon atoms ranging from 16-18 in number.
Toothpaste. Chemical Formula: CaCO3 or NaF.
Explanation:
ASAP please and Thankyou
Is Aushtin dating Summer please help
Answer:
uhm yes he made her pump go off
Explanation:
mass number is the number of protons and neutrons in the nucleus of an isotope . how many electrons in an oxygen-18 atom ?
Answer:
In neutral oxygen atom 8 electrons are present
Explanation:
Which best describes a compound such as magnesium oxide? an impure substance that is made up of two elements a mixture of two uncommon substances a mixture of two common elements a pure substance that is made up of different elements
Answer:
A pure substance that is made up of different elements
Explanation:
Answer:
D. a pure substance that is made up of different elements
Explanation:
Step-by-step explanation:
There are two types of pure substances: elements and compounds.
Elements are made up of only one type of atom. And compounds are pure substances, that are made up of more than one type of element. Like - magnesium oxide. It is a compound of a metal with a non-metal and is held together with ionic bonds.
Non-living factors in an ecosystem are ______.
A. biotic
B. abiotic
C. antibiotic
PLEASE HELP!!!
Answer:
B. abiotic
Explanation:
in biology and ecology, abiotic components or abiotic factors are non living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.
How does heat transfer work?
Answer:
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
Fill in all the grey boxes including the green box. PLEASE HELP
Answer:
2Na + 2H2O ----> 2NaOH + H2
Explanation:
The number of grams in 2.56 x 1025 molecules of HCl are
Answer:
1569.5g
Explanation:
Given parameters:
Number of molecules = 2.56 x 10²⁵
Unknown:
Mass of HCl = ?
Solution:
To solve this problem, let us find the number of moles first;
Number of moles = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]
So,
Number of moles = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex] = 0.43 x 10² = 43mol
Now;
Mass of HCl = number of moles x molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl = 43 x 36.5 = 1569.5g
Question 4 (2 points)
Photosynthesis takes place in the nucleus of cells. (2 points)
O True
O False
false
Explanation:photosynthesis takes place inside an organelle called a chloroplast. For plants, chloroplast-containing cells exist in the mesophyll.
Which statement best describes how deflating a soccer ball is evidence of matter?
a) The ball changes shape from round to flat.
b) The ball increases size and shape.
c) The mass of the ball has increased.
d) The temperature outside the ball has changed.
Answer:
The temperature outside the ball has changed
What is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrichloric acid andb142 grams of calciym chloride is obtained
Answer:
375 grams
Explanation:
The percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
What is percent yield?Percent yield is defined as the amount of product actually made compared with the maximum calculated yield. It is the ratio of actual yield to the theoretical yield.
Mass of calcium carbonate = 155 g
Mass of HCl = 250g
Mass of calcium chloride product = 142 g
Moles of calcium carbonate = 155 / 100 = 1.55 moles
Moles of HCl = 250 / 36.5 = 6.85 moles
Mass of calcium chloride = Moles x Molar mass
= 1.55 mole x 111 g/ mole
= 172 g /mole
Theoretical yield = 172 g
Actual yield = 142 g
Percent yield = Actual yield / Theoretical yield x 100
= 142 / 172 x 100
= 82.55 %
Thus, the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
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What category of elements is characterized by the filling of d orbitals?
Halogens
Alkali Metals
Transition Metals
Alkaline Earth Metals
Explanation:
Transition Metals are characterized by the filling of d orbitals?
what is the Transfer of energy from one object to another through direct contact?
Answer:]
Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, similar to a game of pool where one moving ball strikes another, causing the second to move.
Explanation:
what reaction type is the followong reaction
Answer:
its the fourth one please mark as brainlest
Explanation:
What happens to ions during bonding to form an ionic compound? O Cations accept electrons and anions give away electrons. O Anions and cations share electrons. O Cations give away electrons and anions accept those electrons.
Answer:
Last one: Cations give away electrons and anions accept those electrons.
Explanation:
Just did it
Answer:
D
Explanation:
"Cations give away electrons and anions accept those electrons."
Elements in period 1 are
Answer:
Hydrogen - - helium..
...
Single celled prokaryotic cells use meiosis to reproduce.
TRUE
FALSE
Answer:
True
Explanation:
Single celled prokaryotic cells use meiosis to reproduce. Its ''TRUE''
What is a Prokaryotic cell ?A prokaryote is a single-celled organism that lacks a nucleus, and other membrane-bound organelles.
Prokaryotic cells are single-celled microorganisms known to be the earliest on earth.
Prokaryotes include Bacteria and Archaea.
The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.
A prokaryotic cell consists of a single membrane and therefore, all the reactions occur within the cytoplasm.
Prokaryotes reproduce through a cell division process called binary fission.
Like mitosis in eukaryotes, this process involves copying the chromosome and separating one cell into two.
Hence, Single celled prokaryotic cells use meiosis to reproduce is a ''TRUE'' statement.
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What are the units for the mass of aluminum sulfide
The units for the mass of aluminium sulphide is g/mol.
What is aluminium sulphide?Aluminium sulphide is a chemical compound with the formula Al2S3 and has the mass of 150.158 g/mol.
What are units?A unit is a standard that are used for making comparisons in measurements.
Unit conversions allow for measurements of a property that have been recorded using different units like centimetres to inches.
Hence, the units for the mass of aluminium sulphide is g/mol.
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Please I'm begging for help. I'll give you ALL MY POINTS. JUST PLEASE HELP.
Worksheet: Balancing Equations
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
Explanation:
A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.
Q1) 4Al + 3O2 ---> 2Al2O3
Q2) C3H8 + 5O2 -----> 3CO2 + 4H20
Q3) P4 + 3O2 -----> 2P2O3
Q4) 2KNO3 -----> 2KNO2 + O2
Q5) 3O2 + CS2 ------> CO2 + 2SO2
Try the rest out and tell me did you understand it?
If the value of mass doubles but the volume stays the same, the value for density will be
Answer:
if the value of volume doubles but the mass stays the same, the value for density will be 1