Oxygen

Question 1

What are the 3 parts of the fire triangle?

Answer 1

Oxygen heat and fuel

Question 2

If one of the elements of the fire triangle are removed, then what happens to the fire?

Answer 2

The entire fire goes out

Question 3

Complete combustion

Answer 3

When a substance burns in sufficient oxygen

Question 4

What are the products of complete combustion?

Answer 4

CO2, water energy

Question 5

What is the word equation for complete combustion?

Answer 5

Material + oxygen => carbon dioxide + water (+ energy)

Question 6

Oxidation

Answer 6

When a substance gains oxygen

Question 7

Incomplete combustion

Answer 7

When a substance burns in insufficient oxygen

Question 8

What are the products of incomplete combustion?

Answer 8

Carbon monoxide, carbon

Question 9

What does the copper look like before it’s burned in oxygen?

Answer 9

Orange and shiny

Question 10

What does the copper look like after it’s been burned?

Answer 10

Black flaky powder on the surface of the copper + mass increased due to the layer of copper oxide

Question 11

What is the word equation for the oxidation reaction of copper?

Answer 11

Copper + oxygen => copper oxide

Question 12

What is the balanced symbol equation for the oxidation reaction of copper?

Answer 12

2Cu + O2 => 2CuO

Question 13

What happened in the burning copper experiment?

Answer 13

A small amount of copper was placed inside a suspended tube over a Bunsen burner, and syringes of air were placed on either sides. O2 was passed over the copper as it was heated, and the colour changed from shiny + orange to black and grey. After 10 passes of air , the experiment finished. The volume of air at the start was 100ml, but this changed to 79ml at end, demonstrating that there is 21% of O2 in the atmosphere.

Question 14

What is the test for carbon dioxide?

Answer 14

Turns limewater cloudy when bubbled into it.

Question 15

What is the test for water?

Answer 15

Blue cobalt chloride paper turns pink in the presence of water.

Question 16

What happened in the burning phosphorus experiment?

Answer 16

A glass rod was heated on Bunsen burner and was placed on top of a bit of phosphorus in an evaporating dish floating on water in a bell jar. Phosphorus sets alight and the water level begins to rise. The water stops rising above the 20% line. This demonstrates that the % of oxygen is 21%

Question 17

Are non-metal oxides acidic or alkaline?

Answer 17

Acidic

Question 18

Do metal oxides exist as solids or gasses?

Answer 18

Solids

Question 19

Do non-metal oxides exist as solids or gasses?

Answer 19

Gasses

Question 20

When non-metals are burned in oxygen, the result is a ……… ………. …………..

Answer 20

Non-metal dioxide

Question 21

When metals are burned in oxygen, the result is a …….. ……

Answer 21

Metal oxide

Question 22

Word equation for incomplete combustion

Answer 22

Material + oxygen => carbon monoxide + water

Question 23

Word equation for complete combustion

Answer 23

Material + oxygen => Carbon dioxide + water

Question 24

What colour flame did sodium have when burned in oxygen?

Answer 24

Bright orange

Question 25

What colour flame did sulphur have when burned in oxygen?

Answer 25

Bright blue

Question 26

What colour flame did magnesium have when burned in oxygen?

Answer 26

White