Unit 3 - Chemical Reactions

Question 1

Clues of a Chemical Reaction

Answer 1

• Colour change
• NRG released/absorbed (heat, light)
• Precipitate forms
• Gas made

Question 2

Gas Tests

Answer 2

• O2 = glowing splint test
• H2 = burning/flaming splint test
• CO2 = limewater test

Question 3

Non-metal oxides

Answer 3

• React w/H2O to make acids
• Acidic oxides

Question 4

Metal Oxides

Answer 4

• React w/H2O to make bases
• Basic Oxides

Question 5

Acidic Oxides and Basic Oxides

Answer 5

• React w/each other to make oxyanion salt

Question 6

Acids (H) decompose into

Answer 6

H2O + acidic oxide

Question 7

Bases (OH) decompose into

Answer 7

H2O + basic oxides

Question 8

Oxyanion salts (Anion + O) decomposes into

Answer 8

acidic oxide + basic oxide

Question 9

Heavy Metal Nitrate (NO3 + Ca+) decomposes into

Answer 9

O2 + NO2 + metal oxide

Question 10

Acidic Oxide

Answer 10

NM + O

Question 11

Basic Oxide

Answer 11

M + O

Question 12

Base

Answer 12

OH

Question 13

Acid

Answer 13

H

Question 14

When Carbonates reacts w/acid

Answer 14

Ionic Compound + Water + CO2

Question 15

When Sulfites react w/acids

Answer 15

Ionic Compound + Water + SO2

Question 16

When ammounium salts react w/bases

Answer 16

Ionic Compound + Water + NH3

Question 17

Neutralization Reaction

Answer 17

Acid + Base = Salt + H2O

Question 18

When metals reacts w/acid

Answer 18

• Only element higher than H will displace
• Salt + H2

Question 19

When metal reacts w/H2O

Answer 19

• Only 1st 5 elements displace H in H2O
• M + H2O = M(OH) + H2

Question 20

When halogen reacts w/halidide

Answer 20

Uses order of group in periodic table

Question 21

Halidide

Answer 21

Binary compound w/element + group 7

Question 22

When Sulfide (Just S) reacts w/acids

Answer 22

Salt + Hydrogen sulfide