Chapter 15.1

Question 1

What is a chemical change resulting from a collision between atoms or molecules?

Answer 1

Chemical reaction

Question 2

What is the original substance that undergoes the chemical reaction?

Answer 2

Reactants

Question 3

What is the new substance produced by the chemical reaction?

Answer 3

Products

Question 4

What is an expression that uses chemical symbols to represent a chemical reaction?

Answer 4

Chemical equation

Question 5

What is the number before the chemical formula that indicates how many molecules or formula units of that substance are included in that reaction?

Answer 5

Coefficient

Question 6

What states that the total mass of reactants is equal to the total mass of the products?

Answer 6

Law of conservation of mass

Question 7

What is the term for a chemical equation that has the same number of atoms of each element on each side of the arrow?

Answer 7

Balanced

Question 8

What element in an equation should be balanced first?

Answer 8

The element with the largest subscript

Question 9

What is a chemical reaction in which two or more substances combine to form a new substance?

A+B—>AB

Answer 9

Combination reaction

Question 10

What is a chemical reaction in which a compound breaks down to form different substances?

AB—>A+B

Answer 10

Decomposition reaction

Question 11

What is a chemical reaction in which an element in a compound is replaced by another element?

A+BC—>B+AC

Answer 11

Single-displacement reactions

Question 12

What is a chemical reaction in which two compounds exchange atoms or ions?

AB+CD—>AD+CB

Answer 12

Double-displacement reactions