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Air. O2 + CO2

Science Junior Cert

QuestionAnswer
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
Created by: gcu science
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