Review - Chemical Equations

What does the Law of Conservation of Mass say? It says,

"During a chemical reaction, mass is neither _______ or destroyed."

• burned

• created

• melted

The substances that go into a reaction are called the _______.

• products

• reactants

An ENDOTHERMIC reaction would feel ______ to the touch, while an EXOTHERMIC reaction would feel ______ to the touch.

• hot ; cold

• cold ; hot

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Determine the coefficients to make the following equation balanced?

__N₂ + __O₂--> __NO

• 1, 1, 1

• 1, 1, 2

• 2, 2, 2

• 1, 2, 2

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

How many Oxygens are in this molecule? 
(OH)₂

• 4
• 1
• 2
• 3

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Element or compound?
H₂O

• element
• compound