Combustion

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 always requires oxygen.

Answer 2

True

Question 3

What are the products of complete combustion of hydrocarbons?

Answer 3

The products are carbon dioxide and water.

Question 4

Fill in the blank: The process of burning wood is an example of __________ combustion.

Answer 4

complete

Question 5

What is incomplete combustion?

Answer 5

Incomplete combustion occurs when there is insufficient oxygen, leading to the production of carbon monoxide and soot.

Question 6

Which gas is a poisonous product of incomplete combustion?

Answer 6

Carbon monoxide

Question 7

What is an oxidising agent?

Answer 7

An oxidising agent is a substance that gains electrons in a chemical reaction and causes another substance to be oxidised.

Question 8

Multiple Choice: Which of the following is NOT a product of combustion? A) Carbon dioxide B) Water C) Oxygen D) Heat

Answer 8

C) Oxygen

Question 9

What is the main component of natural gas used for combustion?

Answer 9

Methane

Question 10

True or False: Combustion can occur in the absence of oxygen.

Answer 10

False

Question 11

What is the balanced equation for the complete combustion of methane (CH₄)?

Answer 11

CH₄ + 2O₂ → CO₂ + 2H₂O

Question 12

Fill in the blank: The process of rusting is a type of __________ reaction.

Answer 12

oxidation

Question 13

What is the role of oxygen in combustion?

Answer 13

Oxygen acts as a reactant that combines with the fuel to release energy.

Question 14

Multiple Choice: Which of the following is a sign of incomplete combustion? A) Clear flame B) Yellow flame C) No smoke

Answer 14

B) Yellow flame

Question 15

What does the term ‘oxidation’ refer to in chemistry?

Answer 15

Oxidation refers to the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.

Question 16

True or False: All combustion reactions are exothermic.

Answer 16

True

Question 17

What is the environmental impact of increased carbon dioxide from combustion?

Answer 17

Increased carbon dioxide contributes to global warming and climate change.

Question 18

What are the two main types of combustion?

Answer 18

Complete combustion and incomplete combustion.

Question 19

Fill in the blank: The energy released during combustion is primarily in the form of __________.

Answer 19

heat

Question 20

What is a common use of combustion in everyday life?

Answer 20

Combustion is commonly used for heating, cooking, and powering vehicles.

Question 21

Multiple Choice: Which of the following is an example of an oxidising agent? A) Hydrogen B) Oxygen C) Carbon D) Nitrogen

Answer 21

B) Oxygen

Question 22

What is the effect of a limited supply of oxygen during combustion?

Answer 22

It leads to incomplete combustion and the production of harmful substances like carbon monoxide.

Question 23

True or False: Combustion reactions can only occur with solid fuels.

Answer 23

False

Question 24

What is the primary difference between combustion and oxidation?

Answer 24

Combustion is a specific type of oxidation that produces heat and light, while oxidation can occur without combustion.

Question 25

Fill in the blank: The emission of __________ is a major concern from fossil fuel combustion.

Answer 25

greenhouse gases

Question 26

What safety measures can be taken to prevent carbon monoxide poisoning?

Answer 26

Ensure proper ventilation and install carbon monoxide detectors.

Question 27

Multiple Choice: Which fuel typically produces the least emissions when combusted? A) Coal B) Oil C) Natural gas D) Wood

Answer 27

C) Natural gas