Chemical Reactions and Balancing

Question 1

Chemical reaction

Answer 1

• substances interact to form one or more different substances with new properties
• chemical reaction has happened with heat, gas, production, color, change, light, precipitate

Question 2

chemical equation

Answer 2

Represents a reaction

Question 3

reactants

Answer 3

Chemicals added together

Question 4

“arrow” and double arrow meaning

Answer 4

means produces, double arrow indicate “ reversible reaction”

Question 5

products

Answer 5

Chemicals that are made

Question 6

State symbols

Answer 6

s= solid
l= liquid
g= gas
aq= aqueous (dissolve in water)

Question 7

catalyst

Answer 7

-substance that makes a chemical reaction occur faster without being consumed
-usually included above the arrow in an equation

Question 8

heat

Answer 8

• represented by triangle
• Can be used to speed up a reaction, but is not considered a catalyst because it is a condition, not a chemical

Question 9

word equation

Answer 9

Includes names of reactants products, and catalyst

Question 10

skeleton equation

Answer 10

Reactants and products represented by chemical formulas, and relative quantities are not included

Question 11

balanced chemical equation

Answer 11

Coefficients are added to skeleton equation so number of atoms is the same on both sides, typically include states

Question 12

counting atoms

Answer 12

Molecules/formula units may have brackets to indicate number of atoms

Question 13

steps for balancing chemical equations

Answer 13

1) write the skeleton equation
2) balance, metal ions
3) balance, nonmetal atoms except for O and H
4) balance O atoms
5) balance H atoms
6) check your answer by counting atoms