Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Temperature is a measure of the average ______ energy of the particles in the object.


What determines the speed of atoms and molecules of a particular substance?

Size of the atoms and molecules, temperature of the substance

the kinetic theory states that the higher the temperature, the faster the ______.

particles that make up a substance move

The change of a substance from a solid directly to a gas is called _________.


evaporation refers to the change of state from a ______ to a ________.

liquid, gas

The law of conservation of mass states that mass cannot be ________ or ________.

created, destroyed

Ice floats in water because it is _______.

less dense than water

All matter is made of atoms and molecules that are _________

always in motion

According to the law of conservation of mass, ________

total mass stays the same in changes of state

According to the law of conservation of energy, _________

energy is not created or destroyed in changes of state

when ice melts to form liquid, energy is _______.


A substance changes from a liquid to a gas during evaporation because__________.

energy is absorbed

What happens to the particles of a substance when it condenses?

particles slow down and clump together

Unlike a gas, a plasma _________.

conducts electric current

The kinetic theory helps to explain the differences between _________.

states of matter

According to the new model of the atom, electrons behave like __________.

planets orbiting the sun

Valence electrons determine a atom's

chemical properties

If the atomic mass of carbon is 12 u, 1 mole of pure carbon will have a mass of _____.

12 g

You have 85.5 g of flourine, which has a molar mass of 19 g/mol. How may moles of flourine do you have?

4.5 mol

Decmocritus's original atomic theory was revised because it ________.

did not have a scientific basis

J.J. Thomson created the _________ experiment.

cathode ray

Rutherford did the __________ experiment.

gold foil

Thomson is responsible for discovering that an atom contains a _________.


Whose model determined that an atom's positive charge is concentrated in the atom's center?


What is the mass of 2.5 mol of Ca, which has a molar mass of 40 g/mol?

100.0 g

What is the amount of nickel, which has an average atomic mass of 58.7 u, present in 525 g nickel?

8.90 mol

Avogadro's number is useful for _______.

counting atoms

What is the molar mass of an element with an average atomic mass of 9.012 u?

9.012 g

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?


An element's atomic number is equal to its number of _______.


Two different isotopes of an element have different ________.

numbers of neutrons

What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?


A sodium atom, which has 11 electrons, has __ electron(s) in its third energy level.


An electron jumps to a new energy level when _______.

the atom gains or loses energy

Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and ________.

atoms of different elements could form to join compounds

An element's average atomic mass is a ________ average, so ___________.

weighted, common isotopes have a greater effect than uncommon ones

A mole is an SI base unit that describes the _______ of a substance.


You have 6.50 mol of chromium, which has a molar mass of 52 g/mol. What is the mass in grams of this amount of chromium?

338 g

An atom's mass number equals the number of

protons plus the number of neutrons

Calculate the molar mass of the compound C3H8

44 g/mol

The kinetic theory states that, at the same _______, heavier particles move more slowly than lighter particles.


As energy is added a solid substance, the atoms _________ and move apart.

vibrate faster

For any change of state to occur, ________ must be transferred.


The first person who suggested that matter was made up of atom was the Greek philosopher __________.


A region in which there is a high probability of finding an electron is called a(n) ________.


The number of particles in one mole of a substance is referred to as ___________.

Avogadro's number

The molar mass of krypton is 83.80 g/mol. The mass of 5.00 mol of krypton is ________.

419 g

Thomson's cathode-ray tube experiment supported the theory that _______ exist inside an atom.


Rutherford's gold-foil experiment revealed that an atom's positive charge is concentrated in the atom's ________.


Unit of quantum of light.


Main points of the kinetic theory of matter:

speeds depend on temperature and size, particles are always in motion

Calculate the molar mass of Iron III Oxide Fe2O3

136 g/mol

Calculate the molar mass of Glucose, C6H12O6

132 g/mol

Calculate the molar mass of Sodium Hydroxide, NaOH

40 g/mol

Write the electron configuration of Carbon.

[He] 2s^2, 2p^2

Write the electron configuration of Calcium.

[Ar] 4s^2

Write the electron configuration of Chlorine.

[Ne] 3s^2, 3p^5

If you know element's molar mass, explain how you can determine that mass of a particular amount of the element.

multiply amount of element in moles by its molar mass

Explain why atoms have no electric charge even though they are made up of charged particles.

equal amount of electrons and protons and they equal each other out

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording