Question | Answer |
78% of what gas is found in air | Nitrogen |
21% of what gas is found in air | Oxygen |
The components of air can be _____________ easily | Separated |
The ____________________ of air varies | Composition |
In the experiment to show the amount of oxygen in air, when you pass oxygen over heated copper, what is formed | Copper oxide |
What do you call the paper used to test for water | Cobalt chloride paper |
What colour does the cobalt chloride paper turn if water is present | Blue to pink |
What happens to limewater when carbon dioxide is present | Turns milky |
What do you call a substance which can change the speed of a chemical reaction | Catalyst |
The chemical formula for hydrogen peroxide is what | H2O2 |
The chemical formula for manganese dioxide is what | MnO2 |
Oxygen is a colourless, odourless and __________?gas | Tasteless |
Oxygen is slightly ___________ than air | Heavier |
is oxygen acidic, basic or neutral gas | Neutral |
What happens when you put a glowing splint in oxygen | Relights |
What is formed when magnesium is burned in oxygen | Magnesium oxide |
The chemical formula for calcium carbonate is | CaCO3 |
The chemical formula for Hydrochloric acid is | HCl |
The chemical formula for calcium chloride is | CaCl2 |
Calcium carbonate is more commonly known as what? | Marble chips |
Dilute hydrochloric acid is added to calcium carbonate to make what gas? | Carbon dioxide |
What is added to manganese dioxide to make oxygen gas | Hydrogen peroxide |
Carbon dioxide is odourless, tasteless and what? | Colourless |
Is carbon dioxide acidic, basic or neutral | Acidic |
Does carbon dioxide support combustion | No |
Is carbon dioxide less dense or more dense than air | More dense |
Carbon dioxide dissolves in water to form what acid | Carbonic acid |
Name two uses of oxygen | Breathing , burning |
Name two uses of carbon dioxide | Photosynthesis, fizzy drinks |