Reactions Flashcards
What percentage of the air is nitrogen?
78%
What percentage of oxygen is in the air?
21%
What percentage of the air is Argon?
0.9%
In the air how much carbon dioxide is there?
0.037%
Three physical features of Oxygen are?
Gas, colourless, odourless
Three uses of oxygen are?
Welding torches, rocket fuel, breathing apparatus in hospitals
The word equation for respiration is?
Sugar+oxygen->Carbon dioxide+water(+energy)
Candle wax is made up of substances containing carbon and hydrogen. What are the two products of the reaction.
Carbon dioxide+water
Describe the chemical test for water.
Use the chemical anhydrous copper sulphate which changes colour from white to blue in presence of water
What’s the word equation for Oxygen?
Manganese dioxide
Hydrogen peroxide———————->water+oxygen
What are the chemicals required for the test for oxygen?
Hydrogen peroxide and catalyst+manganese dioxide
The test for oxygen?
Relights a glowing splint
What is a catalyst, and what does it do?
A chemical that speeds up the chemical reaction without being used up
Examples of industrial catalyst.
Iron, platinum and vanadium (V) oxide
What is an enzyme, and what does it do?
Is a soluble protein molecules that speed up chemical reactions in cells
Name some of the chemical reactions that enzymes are involved in.
DNA replication, protein synthesis, and digestion
What is the word equation for the hydrogen test?
Magnesium+hydrochloric acid->magnesium chloride+hydrogen
The chemicals required for the test for hydrogen are.
Hydrochloric acid and magnesium
The test for hydrogen.
Using a lighted splint, you will hear a squeaky pop
The word equation for the test of carbon dioxide is.
Calcium carbonate+hydrochloric acid->calcium chloride+water+carbon dioxide
The chemicals required for the test for carbon dioxide are.
Hydrochloric acid and calcium carbonate
The test for carbon dioxide.
When carbon dioxide is bubbled through limewater, it turns milky
Three uses for carbon dioxide is.
Fizzy drinks, fire extinguisher, dry ice
Observations when calcium carbonate is added to hydrochloric acid are.
Metal carbonate disappears to give a clear solution, Limewater turns milky
Physical properties of carbon dioxide are.
colourless and odourless
What is an exothermic reaction?
They give out heat
What is an endothermic reaction?
They take in heat
What is oxidation?
An oxidation reaction occurs when a chemical reacts with oxygen.
What is reduction?
Reduction is the opposite of oxidation and occurs when a substance loses oxygen.
What is a redox reaction?
A substance which reduces another substance.
