Chemical Equations and Formulas 8th Grade

Question 1

Subscript

Answer 1

Written below and to the right of each element. Tells the number of atoms of each element in the compound/molecule. No subscript written indicates one atom of that element.

Question 2

Coefficient

Answer 2

represents the number of units of each substance taking part in a reaction.

Question 3

reactant

Answer 3

to the left of a chemical formula. substances that are about to react in a chemical reaction.

Question 4

product

Answer 4

substances that are produced from a chemical reaction. to the right of the arrow.

Question 5

Law of conservation of matter/mass

Answer 5

matter cannot be created nor destroyed, but can be transformed from one form to another.

Question 6

PRACTICE BALANCING EQUATIONS

Question 7

How many types of reactions are there?

Answer 7

5

Question 8

Nickname for synthesis reaction

Answer 8

CHEMICAL MARRIAGE

Question 9

Synthesis reaction

Answer 9

2 or more substances chemically combine to form one substance.

Question 10

Nickname for decomposition reaction

Answer 10

CHEMICAL DIVORCE

Question 11

decomposition reaction

Answer 11

one substance chemically breaks down into 2 or more simpler substances.

Question 12

nickname for single displacement reaction

Answer 12

I’VE MET SOMEONE ELSE. I’M LEAVING YOU

Question 13

single displacement reaction

Answer 13

one element replaces another in a compound.

Question 14

nickname for double displacement reaction

Answer 14

TRADING SPOUSES

Question 15

double displacement reaction

Answer 15

the positive ion of one compound switches with the positive ion of the other compound.

Question 16

combustion reaction

Answer 16

any reaction where a reactant combines with oxygen gas to produce water and carbon dioxide. We commonly call this reaction burning.

Question 17

balanced chemical equation

Answer 17

an equation where the number of atoms of each element is the same on both sides of the equation.