Question 1

Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?

Accepted Answer

a compound

Answer

an element

Answer

a mixture

Answer

an atom

Question 2

Compounds are different than elements because compounds are __________.

Accepted Answer

A combination of two or more elements.

Answer

made from the same type of atoms

Answer

pure substance, elements are not

Answer

not able to be broken down into parts

Question 3

The chemical formula of the compound __________ is H$_2$O

Accepted Answer

water

Answer

ammonia

Answer

table salt

Answer

methane

Question 4

Water (H2O), is not found on the periodic table because water is a__________.

Accepted Answer

compound

Answer

liquid

Answer

mixture

Answer

atom

Question 5

What two elements make up common table salt?

Accepted Answer

Chlorine and sodium

Answer

Sodium and oxygen

Answer

Sodium and hydrogen

Answer

Chlorine and hydrogen

Question 6

Which of the following substances can be separated into simpler substances only by chemical means?

Accepted Answer

water

Answer

gold

Answer

salt water

Answer

sodium

Question 7

What is the name of the compound with the formula NaCl?

Accepted Answer

sodium chloride

Answer

monosodium monochloride

Answer

chlorine sodiate

Answer

sodium chlorate

Question 8

Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO$_2$. Carbon dioxide gas is

Accepted Answer

a compound of carbon and oxygen atoms.

Answer

a solution made of carbon and oxygen atoms.

Answer

a mixture of carbon and oxygen atoms.

Answer

an element made of carbon and oxygen atoms.

Question 9

Which of the following are considered pure substances?

Accepted Answer

both elements and compounds

Answer

elements

Answer

compounds

Answer

neither elements nor compounds

Question 10

What is electrolysis?

Accepted Answer

The passing of electricity through an electrolyte with the moving of positive and negative ions to the charged electrodes.

Answer

The passing of electricity through an electrolyte with the moving of positive and negative ions to the uncharged electrodes.

Answer

The passing of electricity through an anode with the moving of positive and negative ions to the charged electrodes.

Answer

The passing of electricity through an electrolyte with the moving of uncharged ions to the charged electrodes.

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