The two factors which must be held constant for density to be a constant ratio are: Mass and Volume
As we know, the density of a material is simply defined as the ratio of mass to volume.
In essence, Density = Mass/VolumeConsequently, To obtain a constant ratio for density, the mass and volume of the material in discuss must be kept constant.
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pliz answer 1 & 2 .... I'll tag best answer brainliest .... no spamming
1,chlorine ions
2,sodium chloride
why do you think that sodium chloride has to be heated to 800c before melting, but candle wax will start to melt at 50c?
Answer:
Sodium chloride is an ionic compound which makes it stronger and have a higher melting and boiling point. Candle wax is a covalent compound so it has a low melting point.
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!A gas under constant pressure has a volume of 30.57 m and a
temperature of 59.0 K. A change in temperature caused the
volume to change to 21.14 m². Based on the relationship
between volume and temperature, what must have happened to
the temperature?
Considering the relationship between volume and temperature, a gas under constant pressure can only have its volume reduced as a result of a decrease in its temperature.
According to Charles law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Thus:
V1/T1 = V2/T2 where V1 = intial volume, V2 = final volume, T1 = initial temperature, and T2 = final temperature.
In this case, T1 = 59.0, V1 = 30.57, and V2 = 21.14
T2 = 21.14 x 59/30.57
= 20.05 K
It can be seen that the temperature of the gas has reduced from 59.0 K to 20.05K.
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How many grams of Fe can be produced when 6.10 g of Fe2O3 reacts?
As per the balanced reaction, two moles or 319.4 g of Fe₂O₃ gives 4 moles or 223.4 g of Fe. Thus 6.10 g gives 4.22 g of Fe.
What is ferric oxide?
Ferric oxide is an ionic compound formed from iron and oxygen in which iron is in +3 oxidation state. It is also called iron oxide which decomposes to form molecular oxygen and iron.
The balanced equation giving Fe and oxygen from ferric oxide is written below:
[tex]\rm 2Fe_{2}O_{3} \rightarrow 4Fe + 3O_{2}[/tex].
The molar mass of ferric oxide is 159.7 g/mol. Thus two moles weighs 159.7 × 2 = 319.4 g. Atomic mass of Fe is 55.85 hence, 4 moles is 223.4 g.
As per the balanced reaction, 319.4 g of ferric oxide gives 223.4 g of iron. Thus mass of iron , Fe produced from 6.10 g of ferric oxide is calculated as follows:
mass of Fe = (223.4× 6.10 ) /319.4
= 4.226 g
Hence, 4.22 g of Fe will be produced from 6.10 g of Fe₂O₃.
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is this statement true or false? the chinese knew how to produce silk by about 2700 b.c.
Answer:
its true
Explanation:
I took the test
Jasmin is planning to attend a softball game today. She is watching the weather forecast and notices a large "L" on the weather map for her area. What prediction can be made about the weather?
Its Science
Answer:
The softball game will still go on because the "L" symbolizes a low pressure system which usually brings sunny weather.
Explanation:
Please help with chemistry!
Answer:
name is Ian symbol is spices mass number is 100
Explanation:
#
a) What is the role of neutrons in an atom?
b) How do we determine how many neutrons are in an atom?
Answer:
numer 1:Neutrons are required for the stability of nuclei, with the exception of the single-proton hydrogen nucleus. Neutrons are produced copiously in nuclear fission and fusion. They are a primary contributor to the nucleosynthesis of chemical elements within stars through fission, fusion, and neutron capture processes.
number 2:The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).let me know if i helped
How many Joules of energy are needed melt 40.0 g of ice?
answer: 334 J
explain: A total of 334 J of energy are required to melt 1 g of ice at 0°C, which is called the latent heat of melting.
Neon consists of three isotopes: Neon-20 with a mass of 19.992 amu and an abundance of 90.48%, Neon-21with a mass of 20.994 amu and an abundance of 0.27%, and Neon-22 with a mass of 21.991 amu and an abundance of 9.25%. Determine the average atomic mass of Neon:
How many grams of H2O is needed to produce 0.75 moles of HCL ?
2 moles of HCl solution reacts with one mole Calcium Hydroxide
Ca
(
O
H
)
2
One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.
One mole of Ca
(
O
H
)
2
has mass 74.1 g
as per equation; 73 g of HCl reacts with 74.1 g of Ca
(
O
H
)
2
1g of HCl reacts with 74.1g / 73 of Ca
(
O
H
)
2
1g of HCl reacts with 1.015 g of Ca
(
O
H
)
2
10/4/2021
the total number of protons and neutrons in the nucleus
of an atom
a) atomic mass unit
b) mass number
c) atomic number
d) atomic mass
Answer:
atomic number
Explanation:
the mixing of which pair of reactants will result in a precipitation reaction?
Answer:
NH4Br and NH4I are both soluble in water, and they don't react with each other. So this pair will not form precipitation.
NaClO4 and (NH4)2S are both soluble in water. While in water, they dissociate into Na+, ClO4-, NH4+ and S2- ions, which don't react with each other. So this pair will not form precipitation.
Ni(NO3)2 and Na2CO3 are both soluble in water. When the 2 solutions combine, NiCO3 forms. NiCO3 is not soluble in water, so it will precipitate out from the solution. This pair will result in precipitation.
K2SO4 and Cu(NO3)2 are both soluble in water. While in water, they dissociate into K+, SO42-, Cu2+ and NO3- ions, which don't react with each other. So this pair will not form precipitation.
Explanation:
Hope this helps...
What law states that matter cannot be created nor
destroyed, even in a chemical reaction?
A
Newton's Laws of Motion
B
Law of Conservation of Mass
Answer:
I believe it would be Law of conservation of mass (sorry if I'm incorrect)
5.
The weight of an object is the force of attraction between the object
and the Earth
TRUE
FALSE
Answer: True
Explanation:
If you’ve seen a baseball game, you’ve probably also experienced the sight of a ball going up and up, until you begin to wonder when it’s going to come down! Yet every time, the ball does fall back to earth. Why? Gravity is an attractive force that exerts a pull between two objects, such as a baseball and the earth.
PLEASE ANWSER CORRECTLY!! I WILL MARK BRAINIEST!! LOOK AT PICURE!!
cacs hạt cấu tạo nên hầu hết cac nguyên tử là
De quien es el modelo matemático
Answer:
si
Explanation:
what is change in science??
Answer:
A transition from one accepted theory to another or from one employed method to another.
Explanation:
please what is the formula for finding mole and give a worked example
Answer:
see explanation
Explanation:
number of moles = mass ÷ relative formula mass
e.g.
Calculate the number of moles of carbon dioxide molecules in 22 g of CO2.
Ar (relative atomic mass) of C = 12, Ar of O = 16
Mr (relative formula mass) of carbon dioxide = 12 + 16 + 16 = 44
number of moles = 22 ÷ 44 = 0.5 mol
what is the name of the ionic compound made of beryllium and chlorine?
Answer:
beryllium chloride
Explanation:
Therefore a compound made from beryllium and chlorine will be named beryllium chloride.
solar powered cars use energy use energy form the sun to work. a panel on the car absorbs light energy from the sun, which then generates a electric current. this electric current, in turn allows this car to move. which shows the correct order of energy transformations that take place in a solar-powered car? A. electrical, chemical, kinetic B. electrical, kinetic, radiant C. radiant, chemical, electrical D. radiant, electrical, mechanical. i will brainliest to fastest answer
Answer:
The answer is
D)
radiant, electrical, mechanical
Explanation:
What is the charge of Cl2?
Answer:
Cl2 does not have any charge
Explanation:
But when it is present in its ionic form then chlorine have -1 charge on it. But charge on chlorine varies from -1 to +7
how many stereoisomers are possible for 2,4-heptadiene?
Answer:
Total of 4 isomers of hepta-2,4-diene are given
Explanation:
pls mark brainliest
hope this helps <3
During photosynthesis,blank energy is transformed into blank energy
Answer:
I am also beginners I don't know I am only completing this answer and sorry!!!!!!
Answer:
Solar Energy and Chemical energy
Explanation:
Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false
Answer:
what do you mean?
Explanation:
Studying the brightness of a star can indeed help scientists determine what part of the life-cycle a star is in. The brightness of a star is directly related to its stage in the life cycle.The statement is true.
During the early stages of a star's life, it is formed from a cloud of gas and dust. As the star contracts under its own gravity, it starts to heat up and emits light. This is known as the protostar stage.
As the star continues to contract, it reaches a point where the core temperature becomes hot enough for nuclear fusion to occur. At this stage, the star enters the main sequence phase, where it will spend the majority of its life. The brightness of the star in this phase is determined by its mass. More massive stars are brighter than less massive ones.
As the star ages, it exhausts its hydrogen fuel in the core and begins to evolve. Depending on its mass, a star can become a red giant, a white dwarf, a neutron star, or even a black hole. Each of these stages has a different brightness profile.
By observing the brightness of a star over time, scientists can gather information about its age, mass, and evolutionary stage. This can provide insights into the star's life cycle and help in understanding the processes occurring within it.
Thus, studying the brightness of a star is an important tool for scientists to determine what part of the life cycle a star is in. By analyzing its brightness profile, scientists can gain valuable information about the star's age, mass, and evolutionary stage.The statement is true.
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What are two or more atoms linked/bonded together called?
Answer:
Molecule
Explanation:
Two or more atoms linked/bonded together is called a molecule.
The atomic number of oxygen is 8. The mass number of an atom of oxygen is 17. Describe the number and type of particles in the nucleus of this atom.
Answer:
protons: 8
neutrons: 9
Explanation:
the atomic number tells you how many protons are in a element. The mass is the number of protons + neutrons.
17 - 8 = 9 neutrons
There are 8 protons and 9 neutrons in the nucleus of the oxygen atom.
What is the atomic number and mass number of an atom?The atomic number of an atom is the number of protons in atom of an element.
It can also be defined as the number of electrons in a neutral atom of an element.
The mass number is the number of protons and neutrons in the nucleus of an atom of an element.
The proton number of the oxygen atom is 8
The neutron number is 17 - 8 = 9
Therefore, in the nucleus of the oxygen atom, there are 8 protons and 9 neutrons.
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atoms from different element combine to form
Answer:
new substances
Explanation:
Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
earth has two movements in space what are they called ?
