Reactions Flashcards
What is air made up of
Oxygen 21%
Nitrogen. 78%
Argon. 0.9%
Carbon dioxide 0.032%
3 physical properties of oxygen
Colourless
Odourless
Gas
(Not very soluble in water, some density as air)
What is the word equation for respiration
Sugar+ oxygen+ carbon dioxide+ water (+energy)
What is the test for oxygen
Relights a glowing splint
What chemicals do you need to test for oxygen
Hydrogen peroxide
Catalyst manganese dioxide
What is a catalyst
A chemical that speeds up chemical reactions without being used up itself
What are some examples of industrial catalysts
Iron
Plantium
Vanadium oxide
What is the equation when testing for oxygen
Manganese dioxide
Hydrogen peroxide——————————————-> water + oxygen
What is the test for hydrogen
With a lighted splint and you will hear a squeaky pop
What chemicals do you need when testing for hydrogen
Hydrochloric acid
Magnesium
What is the equation when testing for hydrogen
Magnesium + hydrochloric acid ——————> magnesium chloride + hydrogen
What is the test for carbon dioxide
After you bubble gas into limewater, the limewater turns from colourless to milky white
What is the equation for testing for carbon dioxide
Calcium carbonate + hydrochloric acid—————-> calcium chloride + water + carbon dioxide
What chemicals do you need when testing for carbon dioxide
Hydrochloric acid
Marble chips ( calcium carbonate)
What are 3 uses of carbon dioxide
Fizzy drinks
Fire extinguisher
Dry ice
2 physical properties of carbon dioxide
Gas
Colourless
Odourless
2 observations when calcium carbonate is added to hydrochloric acid
Fizzing/bubbles of gas
Calcium carbonate disappears
List 3 uses of oxygen
Welding torches.
Rocket fuel.
Breathing apparatus in hospitals.
Name the 2 products of the reaction when candle wax combusts
Carbon dioxide and water
What does exothermic mean?
A reaction that gives out heat
(Temp drops)
Why does endothermic mean
A reaction that takes in heat
What happens when zinc is added to copper?
The blue copper sulphate solution turns to a colourless liquid .
The zinc powder turns to brown sludge.
This is exothermic as the temp increases during the reaction
What are 3 pieces of evidence to tell us that a chemical reaction is taking place?
When zinc is added to copper
Rise in temperature.
Powder disappears.
Liquid changes from blue to colourless
What is oxidation
An oxidation reaction occurs when a chemical reacts with oxygen. (The adding of oxygen)
What is reduction
The opposite of oxidation and occurs when a substance loses oxygen. (Removal of oxygen)
What is a redox reaction?
A reaction where REDuction and OXidation takes place together. (Oxidation and reduction both taking place)
Decide what part has been oxidised and reduction
Calcium+magnesium oxide— calcium oxide+ magnesium
Magnesium oxide was reduced to magnesium.
Calcium was oxidised to calcium oxide
Decide what part has been oxidised and reduction
Zinc oxide+ hydrogen— zinc + water
Zinc oxide was reduced to zinc.
Hydrogen was oxidised to water.
Decide what part has been oxidised and reduction
Aluminium oxide + potassium— aluminium + potassium oxide
Aluminium oxide was reduced to aluminium.
Potassium was oxidised to potassium oxide.
Decide what part has been oxidised and reduction
Aluminium + iron oxide— iron+ aluminium oxide
Iron oxide was reduced to iron.
Aluminium was oxidised to aluminium oxide.
Decide what part has been oxidised and reduction
Copper oxide+ carbon— copper + carbon dioxide
Copper oxide reduced to copper.
Carbon oxidised to carbon dioxide.
Tell me about a thermite reaction.
In the Thermite reaction, the two reactants are iron oxide and Aluminium. The Thermite reaction is a very exothermic reaction as it gives out lots of heat. The reactant iron oxide is reduced to molten iron. This reaction was used to weld train tracks together.
