Testing and Uses of Gases

Question 1

How to prepare oxygen

Answer 1

Manganese dioxide + hydrogen peroxide = Water + Oxygen. The water produced could be separated by evaporation.

Question 2

How to Prepare Carbon Dioxide (Method 1)

Answer 2

Calcium carbonate + Hydrochloric Acid = Carbon Dioxide +Calcium Chloride + Water

Question 3

How to Prepare Carbon Dioxide (Method 2)

Answer 3

Calcium Carbonate (HEAT) Calcium Oxide + Carbon Dioxide

Question 4

How to Prepare Hydrogen

Answer 4

Magnesium + hydrochloric acid = Magnesium chloride + hydrogen

Question 5

Why is Carbon Dioxide Used in Carbonating Drinks

Answer 5

It is used in carbonate (fizzy) drinks because it dissolves in water under pressure and when you open the bottle/can, the pressure falls and the gas bubbles out of the solution.

Question 6

Why is Carbon Dioxide Used in Fire Extinguishers

Answer 6

It is used in fire extinguishers because it is a dense gas, denser than oxygen and can displace it, basically pushing it out of the way so that no more oxygen reaches the fire. Thereby putting it out.

Question 7

Describe Carbon Dioxide’s Solubility and Density

Answer 7

Carbon dioxide is a colourless, odourless gas, denser than air and slightly soluble in water.