Chemistry Unit Test Review

Question 1

A block has a volume of 10 cm3 and a mass of 50 g. What is the density of the block?

Accepted Answer

5 g/cm3

Question 2

How many different elements are used to make water (H2O)?

Accepted Answer

2

Question 3

Elements on the periodic table are arranged by atomic number and:

Accepted Answer

similar reactions / properties

Question 4

Evaporation occurs when a liquid changes into a gas. This is an example of:

Accepted Answer

an endothermic reaction

Question 5

How many molecules of water are represented by the formula 4H2O?

Accepted Answer

4

Question 6

Is this a balanced equation? 2H2 + O2 --> 2H2O

Accepted Answer

yes

Question 7

The pull of gravity on the basketball is the basketball's

Accepted Answer

weight

Question 8

Which of these is a chemical change?

Accepted Answer

iron rusting

Question 9

Sodium is represented by the following chemical symbol:

Accepted Answer

Na

Question 10

Which of the following is not made of molecules?

Accepted Answer

light

Question 11

The total number of protons and neutrons in the nucleus determines the atom’s

Accepted Answer

atomic mass number

Question 12

True or False: Atoms in a gas state are closer together and slower than atoms in a solid state.

Accepted Answer

False

Question 13

What are the products in 2HCl + Zn --> H2 + ZnCl2?

Accepted Answer

H2 + ZnCl2

Question 14

Electrons have a _________________________ charge.

Accepted Answer

negative

Questions 14