*Topic 2-reactions Part 1 Flashcards
What is gases is air a mixture of
Nitrogen Oxygen Carbon dioxide Water vapour Noble gases
Name the % of each gas in the air
Oxygen- 21%
Nitrogen-78%
Argon-0.9%
Carbon dioxide-0.037%
Name uses of Oxygen
Welding torches
Rocket fuel
Breathing apparatus in hospitals
Name uses of carbon dioxide
Fizzy drinks
Fire extinguisher
Dry ice
Name 3 physical properties of oxygen
Colourless odourless gas, not very soluble in water, same density as air
Give 2 physical properties of carbon dioxide
Gas
Colourless and odourless
Describe preparation of oxygen in the lab using manganese dioxide and hydrogen peroxide
Hydrogen peroxide->water+oxygen
Wear eye protection
Causes serious eye irritation
Harmful by inhaling and if swallowed
What does a catalyst do
A chemical that speeds up a reaction without being used up itself
What are enzymes
Biological catalysts
Describe the outcome of the test for oxygen
Glowing splint will re-light
Recall the preparation of hydrogen by reacting a metal with acid
Magnesium+Hydrochloric Acid->magnesium chloride+Hydrogen
How do you test for Hydrogen gas
A lit splint will burn with a squeaky pop
What mixture of gases is explosive
H2 and O2
Explain safety precautions for preparing/using hydrogen
Wear eye protection
It’s flammable
Causes burns
Recall the preparation of carbon dioxide from the reaction of marble chips
Calcium carbonate +hydrochloric acid -> calcium chloride +water + carbon dioxide
Bubbles of gas
Calcium carbonate disappears
