Examples of chemical reactions Flashcards
What is combustion
Combustion is burning in oxygen
What 3 things are needed for combustion?
Fuel
Heating
Oxygen
What are hydrocarbons?
Fuels that contain only hydrogen and carbon
COMBUSTION EQUATION FOR HYDROCARBON
Hydrocarbon + oxygen =
carbon dioxide + water + energy
What is oxidation?
It is the gain on oxygen
When a substance reacts with oxygen, it’s called an oxidation reaction
Give examples of oxidation
Combustion
Rusting
Write a word equation for rusting
iron + oxygen —> iron oxide
Which one is the oxidation reaction: neutralisation, thermal decomposition or combustion?
combustion
What is thermal decomposition?
It is when you heat a substance and it breaks down
Thermal decomposition
Write a word equation if you heat copper carbonate
Which of the following reactions is also a combustion reaction: bike rusting, extracting a metal from a metal oxide or a bonfire
Bonfire
The picture shows a candle burning in oxygen. What type of reaction occurs when something burns in oxygen?
Thermal decomposition
Combustion
Rusting
Combustion
Heat
Light
What 2 gases are released when a candle burns?
Carbon dioxide
Water vapour
Chemical reactions result in a transfer of energy.
Compare the amount of energy stored in the products and reactants in an exothermic reaction
The products have less energy than the reactants
Which of the following types of reaction is an example of an endothermic reaction?
Tick one box.
Combustion
Oxidation
Neutralisation
Thermal decomposition
Thermal decomposition
How can you tell the reaction is endothermic?
3
During a reaction between solutions of citric acid and sodium hydrogencarbonate, the temperature of the surroundings went down.
3.1 How can you tell the reaction is endothermic?
The temperature of the surroundings goes down
During a reaction between solutions of citric acid and sodium hydrogencarbonate, the temperature of the surroundings went down.
Where is the energy transferred from in an endothermic reaction?
From the surroundings
.3 What happens to the amount of energy in the universe after the reaction?
It stays the same
What happens when Ethene burns in oxygen?( what is ethene)
What are precipitation reactions?
Chemical reactions where solutions react to form insoluble products are known as precipitation reactions.
What is meant by insoluble?
Lime scale forming in a kettle is an example of a precipitation reaction.
This is caused by the thermal decomposition of Calcium Bicarbonate in tap water turning into insoluble Calcium Carbonate - limescale.
