Reaction Flashcards
(28 cards)
What percentage is oxygen in the air
21%
What % is nitrogen in the air
78%
What % is argon in air
0.9%
What % is carbon dioxide in the air?
0.037
3 properties of oxygen
Colourless
Odourless
Gas
Not very soluble in water
Same density as air
Slightly denser than water
melting point of -219°C and a boiling point of -183°C
3 uses of oxygen
Wielding torches
Rocket fuel
Breathing apparatus in hospitals
Word equation for respiration
Sugar + oxygen = carbon dioxide + water (+energy)
Chemical test for water?
Use the chemical anhydrous copper sulfate which changes colour from white + blue in presence of water
Equation for preparation of oxygen
Manganese dioxide
Hydrogen peroxide = Water + oxygen
Test for oxygen
Relights with a glowing splint
What’s a catalyst
It’s a chemical that speeds up a chemical reaction without being used up itself
3 examples of industrial catalysts
Vanadium (V) oxide
Platinum
Iron
Equation for preparation of hydrogen
Magnesium + hydrochloric acid = magnesium chloride + hydrogen
What are the chemicals required for oxygen?
Hydrogen peroxide
Catalyst manganese dioxide
What are the chemical required for hydrogen
Hydrochloric acid
Magnesium ribbon
Test for hydrogen
Worth a lighted splint and you’ll hear a squeaky sound
Air is a mixture of what gases?
Oxygen, nitrogen, argon, water vapour and noble gases
Properties of carbon dioxide
It is a colourless and odourless gas.
It is denser than air.
It has a melting point of -56C and has a boiling point of -79C.
Properties of nitrogen
colorless, odorless, and tasteless gas.
It is a non-poisonous gas
melting point –210°C; boiling point –196°C;
Uses for hydrogen
Making margarine
Rocket fuel
Clean fuel
Uses for carbon dioxide
Fizzy drinks
Dry ice
Fire extinguishers
Endothermic reactions
A reaction that takes in heat
Exothermic reactions
Gives out heat
Examples of endothermic reactions
Melting ice cubes
Evaporating liquid
Splitting gas molecules
