Trimester 2 Unit 4

Question 1

Chemical Reaction

Answer 1

The process by which atoms of one or more substances are rearranged to form different substances

Question 2

Reactants

Answer 2

Compounds on the left side of arrow, what we start with

Question 3

Products

Answer 3

Compound on right side of arrow, what is produced

Question 4

Why balance chemical equations

Answer 4

law of conservation of mass

Question 5

Rules for balancing equations

Answer 5

Substricts only apply to the element they are after
Coefficients apply to all elements in the chemical they are attached to

Question 6

Chemical Reaction Examples

Answer 6

burning, rotting, rusting

Question 7

Signs of a chemical reaction

Answer 7

color change, gas formation, energy change, temperature change, precipitate is formed

Question 8

Arrow

Answer 8

means a reaction is taking place

Question 8

Plus sign

Answer 8

separates the different chemicals

Question 9

Exothermic

Answer 9

takes less energy to break the bonds of the reactants than is released when the bonds are formed

Question 10

Endothermic

Answer 10

takes more energy to break the bonds than when the products are formed

Question 11

What are the five types of chemical reactions

Answer 11

Synthesis, Decomposition, Single Replacement, Double Replacement, Combustion

Question 12

Synthesis

Answer 12

A compound is made from simpler materials. A+B=AB

Question 13

Decomposition

Answer 13

A compound is broken down into simpler compounds. AB=A+B

Question 14

Combustion

Answer 14

A compound containing carbon and hydrogen (sometimes oxygen) combines with oxygen gas to produce carbon dioxide and water. CxHy(Oz)+O2=CO2+H2O

Question 15

Single Replacement

Answer 15

One element that starts out by itself replaces another element in a compound, kicking it out. A+BC=B+AC

Question 16

Double Replacement

Answer 16

The positive and negative ions in two compounds switch places. AB+CD=AD+BC