Chemical Reactions Quiz 2

When new substances form from old substances, substances might...

• break apart

• rearrange atoms

• stick together

• all answers are correct

Density is calculated...

• D=m x v

• D=m/v

• D=v/m

• all answer choices

Which of these are properties of matter?

• Density

• color

• flammability

• viscosity

• all of the answers are correct

How many different gases are produced when we added electrical energy to water?

• 2

• 3

• 4

• 5

When we added electrical energy to water, what was the most abundant gas produced?

• oxygen

• sulfur

• carbon dioxide

• hydrogen

Boiling water is a _____change.

• Physical

• chemical

Water electrolysis is a _____ change .

• physical

• chemical

Molecules are made of _____.

• gases

• other molecules

• atoms

• solids

All the substances in our world are made of ____ atoms.

• thousands

• very few

• millions

• 50

What is unique to a substance?

• number of atoms

• type of atoms

• arrangement of atoms

• all answers are correct