First Semester Exam

Question 1

Why do we balance equations?

Answer 1

So that they will follow the law of mass conservation.

Question 2

When do we use paraenthasies in equations?

Answer 2

When there is more than one polyatomic ion in a formula.

Question 3

What are three ways you can tell chemical reaction has happend?

Answer 3

When properties of the chemical change. (ex. Formation of a gas, a change in color, or the release of heat or light.)

Question 4

What is a substance that changes a reaction rate without being permanently changed by the reaction?

Answer 4

Catalyst

Question 5

What symbol is someines used to indicate a solid product?

Answer 5

Question 6

What symbol is used to indicate a liquid product or reactant?

Answer 6

(l)

Question 7

Identify the type of reactant.

Answer 7

Synthesis Reaction

Question 8

Identify type of reactant.

Answer 8

Decomposition Reactant

Question 9

Identify type of reactant.

Answer 9

Double Replacement Reactant

Question 10

Identify type of reaction.

Answer 10

Single replacement reaction

Question 11

What symbol indicates that heat must be supplied to reactant before a reaction?

Answer 11

Question 12

Balance Chemicals

Answer 12

https://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html