Rections Flashcards
What are the physical properties of oxygen?
Colourless
Odourless
Gas
What is the composition of air?
Oxygen - 21%
Nitrogen - 78%
Argon - 0.9%
CO2 - 0.37%
What is the word equation for respiration?
Sugar + Oxygen -> Carbon Dioxide + Water(+Energy)
What is the chemical test for water?
Use the chemical anhydrous copper sulfate which changes colour from white to blue in prescience of water
What is combustion?
When a fuel reacts with oxygen to release energy
What are the uses of oxygen?
Welding torches
Breathing apparatus in hospitals
Rocket fuel
What is the word equation for the preparation of oxygen?
Manganese dioxide
Hydrogen peroxide -> water + oxygen
What chemicals are required for the preparation of oxygen?
Hydrogen peroxide Manganese dioxide (catalyst)
What is the test for oxygen?
Relights a glowing splint
What is a catalyst?
A chemical which speeds up reaction with out being used up itself
What are 3 examples of an industrial catalyst?
Iron
Platinum
Vanadium oxide
What are enzymes?
Soluble protein molecules that can speed up chemical reactions in cells
What chemical reactions are enzymes involved in?
DNA replication
Protein synthesis
Digestion
What are the uses of hydrogen?
Making margarine
Clean fuel
Rocket fuel
What is the equation for hydrogen?
Magnesium + hydrochloric acid -> magnesium chloride + hydrogen
What chemicals are required in the preparation of hydrogen?
Magnesium
Hydrochloric acid
What is the test for hydrogen?
Using a lighted splint you will hear a squeaky pop
What are the uses of carbon dioxide?
Fizzy drinks
Fire extinguisher
Dry ice
What is the equation for carbon dioxide?
Calcium carbonate + hydrochloric acid -> calcium chloride + water + carbon dioxide
What chemicals are required for the preparation of carbon dioxide?
Calcium carbonate
Hydrochloric acid
What is the test for carbon dioxide?
Turns limewater milky
What are two observations when calcium carbonate is added to hydrochloric acid?
Bubble of gas
Metal carbonate disappears to give a clear solution
What are two physical properties of carbon dioxide?
Colourless
Gas
What is an exothermic reaction?
Gives out heat
What is an endothermic reaction?
Takes in heat
What is oxidation?
Occurs when a chemical reacts with oxygen
What is reduction?
The opposite of oxidation and occurs when a substance looses oxygen
What is a redox reaction?
When REDUCTION and OXIDATION take place together.
What colour is copper?
Black
What colour is copper oxide?
Black
What is thermal decomposition?
The breaking down of a chemical using heat
What is a reducing agent?
Substance that reduces another substance
