Chemical Reactions

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

The left side of the equation below is called

• Products
• Reactants

The right side of the equation below is called the

• products
• reactants

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

• Coefficient
• reactant
• subscript
• product 

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

Which of the following answers will balance the equation below?
__K + __Br₂ --> __KBr

• 2, 1, 1
• 2, 3, 2
• 2, 1, 2
• 1, 2, 3

How many Carbons are present on the reactant side?

• 1

• 2

• 3

• 4

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

• 1

• 2

• 3

• 4

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

• 1

• 2

• 3

• 4

Which is the correct word equation for photosynthesis?

• water + glucose + oxygen ---> energy + carbon dioxide

• energy + oxygen + carbon dioxide ---> water + glucose

• water + carbon dioxide + energy ---> glucose + oxygen

• glucose + oxygen ---> water + carbon dioxide + energy