Physical Science Unit 4 Review

What is a chemical reaction?

• A process that produces a chemical change, in which substances are not changed into new substances.

• A process that produces a chemical change, in which substances are changed into new substances.

• A process that produces a physical change, in which substances are not changed into new substances.

• A process that produces a physical change, in which substances are changed into new substances.

What is NOT an example of a chemical reaction you see everyday?

• Rusting

• Burning (AKA combustion)

• Cooking

• Ice melting

Let's say you mix two unknown chemicals.

Which of the following could be a sign that a chemical reaction has occurred?

• Change in color

• Bubble formation

• Release of light

• Change in temperature

• All of the above

If a car began with 1000 grams of gasoline and oxygen, how much water and carbon dioxide do you think would be produced from the gasoline and oxygen?

• 0 g

• 500 g

• 1000 g

• 15000 g

What are the reactants in this chemical equation?

• CO

What are the reactants in this chemical equation?

How many atoms of hydrogen are on the product side of this chemical equation?

• 1

• 2

• 4

• 8

Products are located on _____ of the arrow in a chemical equation.

• the right side

• the left side

• both sides

• none of the above

Reactants are located on _____ of the arrow in a chemical equation.

• the right side

• the left side

• both sides

• none of the above

The law of conservation of mass states that matter cannot be ____________ or ____________, only ____________ into new substances.

• rearranged, destroyed, created

• created, destroyed, rearranged

• rearranged, created, destroyed

• rearranged, transferred, turned