Question 1

Which is the BEST example of a pure substance?

Accepted Answer

gold

Answer

air

Answer

peanuts

Answer

milk

Question 2

Which statement BEST explains how periods on the periodic table are organized?

Accepted Answer

increasing atomic number from left to right

Answer

increasing number of neutrons from left to right

Answer

decreasing number of electrons from left to righ

Answer

decreasing atomic mass number from left to right

Question 3

An ice cube is put into a heated pan. What will MOST LIKELY happen to the molecules in the ice as the ice is heated?

Accepted Answer

The molecules will begin to move faster.

Answer

The molecules will begin to condense in the air.

Answer

The molecules will begin to increase in density. '

Answer

The molecules will begin to move slower.

Question 4

Which BEST explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

Accepted Answer

Gases were released to the atmosphere.

Answer

physical change occurred.

Answer

Precipitates were created in the new solution.

Answer

Atoms involved in the reaction lost mass.

Question 5

What happens to water molecules during the boiling process?

Accepted Answer

They move faster and move farther apart as they absorb heat.

Answer

They move faster and remain close together as they absorb heat.

Answer

They move more slowly but move farther apart as they lose heat.

Answer

They move faster and move farther apart as they lose heat.

Question 6

Which pair of elements has the most similar properties?

Accepted Answer

N and P

Answer

Li and B

Answer

I and Ca

Answer

K and He

Question 7

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

Accepted Answer

6 atoms of carbon (C)

Answer

3 atoms of carbon (C)

Answer

12 atoms of carbon (C)

Answer

2 atoms of carbon (C)

Question 8

The table shows properties of several elements. 
Which element would Element X MOST LIKELY be grouped with on the periodic table?

Accepted Answer

potassium

Answer

calcium

Answer

chlorine

Answer

copper

Question 9

Which shows one example of a physical change and one example of a chemical change?

Accepted Answer

freezing water and burning coal

Answer

dissolving powder and shredding paper

Answer

rusting iron and baking a cake

Answer

boiling water and melting wax

Question 10

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Accepted Answer

During a chemical reaction, the total amount of matter stays the same.

Answer

During a chemical reaction, matter is destroyed.

Answer

During a chemical reaction, one or more new substances are formed.

Answer

During a chemical reaction, the total number of atoms increases.

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