Combustion

Question 1

Water extinguisher

Answer 1

Use; Wood, paper and textiles.

Don’t use; Flammable liquids. Live electrical equipment.

Question 2

Test for Oxygen

Answer 2

Light a splint, but only begin the test when it is glowing. When Oxygen is present the splint fire will relight.

Question 3

What is the fire triangle - what is the main purpose of this scientific model?

Answer 3

The fire triangle is a scientific model used to describe the three components of combustion - fuel, heat and oxygen.

Its main purpose is to represent that the removal or lack of any of these components results in no combustion or incomplete combustion.

Question 4

Exothermic definition

Answer 4

A chemical reaction that occurs, which means the reaction transferee energy to its surroundings. This causes the surrounding area and the reaction to feel hot.

Question 5

Law of conservation of mass

Answer 5

The law of conservation of mass refers to the law that during a chemical reaction no mass can be lost or gained. The particles of the reactants rearrange.

Question 6

Chemical reaction for a Metal Oxide

Answer 6

Metal + Oxygen —> Metal Oxide

Question 7

Hydrocarbon definition

Answer 7

A chemical compound which contains only hydrogen and carbon atoms.

Question 8

Carbon Dioxide Extinguisher

Answer 8

Use; Flammable liquids. Live electrical equipment.

Don’t use; In confined spaces.

Question 9

Is Combustion Endothermic or Exothermic?

Answer 9

Combustion is an Exothermic reaction, meaning it transfers energy into the surrounding area.

Question 10

Wet Chemical Extinguisher

Answer 10

Use; Wood, paper and textiles. Cooking oil fires.

Question 11

Coal oxidation

Answer 11

Coal + Oxygen —> Carbon dioxide

Question 12

Combustion equation (when hydrocarbon)

Answer 12

Hydrocarbon + Oxygen —> Carbon dioxide + Water

Question 13

Fuel definition

Answer 13

A chemical substance from which stored energy can be transferred usefully to make things happen.

Question 14

Endothermic definition

Answer 14

A chemical reaction that occurs, which means the reaction takes energy from its surroundings. This causes the surrounding area and the reaction to feel cold.

Question 15

Test for Water

Answer 15

Method 1; Using Cobalt paper, when water is present the paper turn from white to pink.

Method 2; Using Cobalt Chloride crystals, when water is present the crystals turn from blue to pink.

Question 16

Combustion definition

Answer 16

Another name for burning. This is when a fuel reacts with oxygen to release energy - in the forms of heat light or sound.

Question 17

Test for Hydrogen

Answer 17

A lit splint should create a squeaky pop in an environment with high levels of hydrogen.

Question 18

What is the chemical symbol for hydrocarbons?

Answer 18

CH4

Question 19

Metal Oxide definition

Answer 19

A metal oxide is created when a metal chemically combines with oxygen.

Question 20

Forest fire definition

Answer 20

An uncontrolled fire that burns in the wild land vegetation, often in rural areas.

Question 21

Test for Carbon dioxide

Answer 21

Clear lime-water solution at the start. When Carbon dioxide is present the solution will turn cloudy.

Question 22

Incomplete combustion definition

Answer 22

When fuel combusts with little or lack of oxygen.

Question 23

Hydrogen oxidation

Answer 23

Hydrogen + Oxygen —> Water

Question 24

Dry Powder Extinguisher

Answer 24

Use; Wood, paper and textiles. Flammable liquids. Gaseous fires. Live electrical fires.

Question 25

Oxidation definition

Answer 25

When oxygen is a reactant in the chemical equation.

Question 26

Foam Extinguisher

Answer 26

Use; Wood, paper and textiles. Flammable liquids.

Don’t use; Live electrical equipment.

Question 27

Mass definition

Answer 27

The measurement of the amount of matter that an object is made of. Measured in grams (g). Everything with matter has mass.