Gases

Question 0

Oxygen formula

Answer 0

O2

Question 1

What is the test for hydrogen gas?

Answer 1

Pop test

Question 2

Properties of oxygen

Answer 2

Colourless 
Odourless
Reasonably soluble (dissolves well in water)
About the same density as air
Supports combustion

Question 3

Equation for the preparation of oxygen

Answer 3

Mn02

H2O2(ag) → H2O(l) + O2(g)

Question 4

Equation for testing oxygen

Answer 4

C6H12O6 + 6O2 → 6CO2 + 6H2O (+ energy)

Question 5

Test for oxygen

Answer 5

Burning splint test

Question 6

How is oxygen made

Answer 6

using hydrogen peroxide (H2O2) with MnO2 catalyst (speeds up reaction)

Question 7

Properties of hydrogen gas

Answer 7

Colourless
Odourless
Less dense than air
Explosive

Question 8

Formula for hydrogen

Answer 8

H2

Question 9

Preparation for hydrogen gas

Answer 9

Hydrogen gas can be prepared by reacting and acid such as Hydrochloric Acid (HCl) with a metal like Zinc (Zn) or Magnesium (Mg).

Question 10

Preparation equation for hydrogen

Answer 10

Zn(s) + HCl(aq) → H2 (g) + ZnCl2 (g)

Question 11

Test for hydrogen

Answer 11

Pop test

Question 12

Reaction equation for hydrogen

Answer 12

H2 (g) + O2 (g) → H2O (g)

Question 13

What energy does the reaction release

Answer 13

heat, light and sound

Question 14

Properties of carbon dioxide

Answer 14

Colourless
Odourless
Denser than air

Question 15

Formula of carbon dioxide

Answer 15

CO2

Question 16

More properties of carbon dioxide

Answer 16

Carbon Dioxide exists as a gas at room temperature and has boiling point of -78°C.
It exists only as a gas and a solid (called Dry Ice) and changes state directly between these

Question 17

What is carbon dioxide used for

Answer 17

fire extinguishers, fizzy drinks, wine-making, as a refrigerant, and in welding.

Question 18

What is carbon dioxide used for

Answer 18

Photosynthesis:
Light
Water + Carbon Dioxide  Glucose + Oxygen

Question 19

What is carbon dioxide produced by

Answer 19

Respiration:
Glucose + O2  H2O + CO2 + Energy
Fermentation:
Glucose  Alcohol + CO2 + Energy
Combustion:
Fuel + O2  H2O + CO2 + Energy

Question 20

Carbon dioxide preparation equasion

Answer 20

CaCO3 + HCl  H2O + CO2 + CaCl2

Question 21

Carbon dioxide test

Answer 21

Limewater test

Question 22

Uses of hydrogen

Answer 22

Balloons