CHEM CH 8: part 1

Question 1

Chemical Reactions and Equations

A chemical change is also known as a ___.

Answer 1

Chemical reaction

Question 2

Chemical Reactions and Equations

A chemical reaction can be described by either a __ or through the use of a ____.

Answer 2

sentence

chemical equation

Question 3

Chemical Reactions and Equations

__ __: a shorthand method of representing what happens in a chemical reaction. It consists of element symbols, compound formulas and special symbols to help describe the reaction.

Answer 3

Chemical equation

Question 4

Chemical Reactions and Equations

Since atoms cannot be created or destroyed in a chemical reaction, equations must reflect this fact by being ___.

Answer 4

Balanced.

Question 5

Chemical Reactions and Equations

Balanced means:

Answer 5

1. All element symbols and compound formulas must be written correctly.
2. The number of atoms of each element involved in the reaction must be the same before the reaction and after the reaction. (equalizing)

Question 6

Chemical Reactions and Equations

arrow represents:
left side of arrow represents:
right side of arrow represents:

Answer 6

chemical reaction
before chemical reaction
after chemical reaction

Question 7

Chemical Reactions and Equations

Equalizing is done by the placing of ____ in front of the element symbols and or compound formulas.

Answer 7

multipliers= coefficient