Science - Combustion and Oxidisation

Question 1

What is combustion?

Answer 1

Combustion is a chemical reaction that occurs when a substance reacts with oxygen to produce heat and light.

Question 2

True or False: Combustion requires oxygen.

Answer 2

True

Question 3

Fill in the blank: The products of complete combustion of hydrocarbons are _____ and water.

Answer 3

carbon dioxide

Question 4

What is oxidation?

Answer 4

Oxidation is a chemical process where a substance loses electrons, often involving the reaction with oxygen.

Question 5

Which of the following is NOT a product of combustion? A) Carbon Dioxide B) Water C) Oxygen D) Heat

Answer 5

C) Oxygen

Question 6

What is the main fuel source in combustion reactions?

Answer 6

Hydrocarbons

Question 7

True or False: Incomplete combustion produces carbon monoxide.

Answer 7

True

Question 8

What is the formula for complete combustion of methane?

Answer 8

CH4 + 2O2 → CO2 + 2H2O

Question 9

Fill in the blank: Combustion reactions are usually _____ reactions.

Answer 9

exothermic

Question 10

What is a common use of combustion?

Answer 10

Heating, cooking, and powering engines.

Question 11

True or False: Oxidation can occur without combustion.

Answer 11

True

Question 12

What is a catalyst?

Answer 12

A substance that speeds up a chemical reaction without being consumed in the process.

Question 13

Fill in the blank: Combustion in engines is often controlled to improve _____ efficiency.

Answer 13

fuel

Question 14

What is the term for the flame produced during combustion?

Answer 14

Fire

Question 15

What happens to the temperature during combustion?

Answer 15

It increases significantly.

Question 16

True or False: All combustion reactions produce smoke.

Answer 16

False

Question 17

What is the role of oxygen in combustion?

Answer 17

Oxygen acts as an oxidizer that enables the combustion reaction.

Question 18

Which gas is produced during incomplete combustion?

Answer 18

Carbon monoxide

Question 19

Fill in the blank: The process of rusting is a form of _____ reaction.

Answer 19

oxidation

Question 20

What is the main difference between complete and incomplete combustion?

Answer 20

Complete combustion produces carbon dioxide and water, while incomplete combustion produces carbon monoxide and soot.

Question 21

What physical state do most fuels exist in for combustion?

Answer 21

Liquid or gas

Question 22

True or False: Combustion can only occur in air.

Answer 22

False

Question 23

What is a fire triangle?

Answer 23

A model that illustrates the three elements needed for combustion: fuel, oxygen, and heat.

Question 24

What type of reaction is combustion classified as?

Answer 24

Exothermic reaction

Question 25

Fill in the blank: The energy released during combustion is often used to _____.

Answer 25

do work

Question 26

What is a common example of a combustion reaction in everyday life?

Answer 26

Burning wood in a fireplace.

Question 27

What is the environmental impact of combustion?

Answer 27

It can produce pollutants and contribute to climate change.