LT#4: Double Displacement, Complete and Incomplete Combustion Reactions

Question 1

Name the 3 types of proof that a DD reaction has occurred.

Answer 1

1. Precipitate made
2. Gas made
3. Neutralization occured

Question 2

Which 3 compounds fall apart into gases when made in DD reactions?

Answer 2

H₂CO₃

H₂SO₃

NH₄OH

Question 3

How do you tell if No Reaction occurs during a DD?

Answer 3

All product states are aq, and you don’t have a gas forming compound

Question 4

Identify the type of reaction and write the balanced chemical equation including states for Hydroiodic acid and Calcium hydroxide

Answer 4

DDN

HI(aq) + Ca(OH)₂(aq) –> CaI₂(aq) + H₂O(l)

Question 5

Identify the type of reaction and write the balanced chemical equation including states for Ammonium chloride and Zirconium oxide

Answer 5

NR

Question 6

Identify the type of reaction and write the balanced chemical equation including states for Scandium borate and Sodium carbonate

Answer 6

DDP

2ScBO₃(aq) + 3Na₂CO₃(aq) –> Sc₂(CO₃)₃(s) + 2Na₃BO₃(aq)

Question 7

Identify the type of reaction and write the balanced chemical equation including states for Cobalt (II) sulphite and Hydronitric acid

Answer 7

DDG

3CoSO₃(aq) + 2H₃N(aq) –> Co₃N₂(aq) + 3H₂O(l) + 3SO₂(g)

Question 8

Identify the type of reaction and write the balanced chemical equation including states for Nitrous acid and Potassium bromide

Answer 8

NR

Question 9

What are the products of a Complete Combustion?

Answer 9

CO₂(g) and H₂O(g)

Question 10

What are the products of an Incomplete Combustion?

Answer 10

CO₂(g) + H₂O(g) + CO(g) + C(s)

Question 11

What causes an incomplete Combustion to occur?

Answer 11

Not enough O₂ mixed in with hydrocarbon

Question 12

Give an example of a Complete Combustion that does not involve a hydrocarbon.

Answer 12

Burning reactive metals such as Mg

Question 13

How can you tell what type of combustion you have by looking at the flame?

Answer 13

Complete = Clean, blue flame

Incomplete = Dirty orange/yellow flame

Question 14

Why are Incomplete Combustion reactions dangerous?

Answer 14

Makes CO(g) which is a odourless, colourless poisonous gas which can kill you

Question 15

Write the balanced chemical equation including states for the complete combustion of C₇H₁₆

Answer 15

C₇H₁₆(l) + 11O₂(g) –> 7CO₂(g) + 8H₂O(g)

Question 16

Write the balanced chemical equation including states for the incomplete combustion of C₇H₁₆

Answer 16

2C₇H₁₆(l) + 11O₂(g) –> 2CO₂(g) + 16H₂O(g) + 2CO(g) + 10C(s)