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WorksheetsATS KS3 C3: Chemical Reactions
Total questions: 15
Worksheet time: 8mins
True or false? Chemical reactions are easily reversible
True
False
True or false: A change in state is a chemical reaction
True - something melting would be an example of a chemical reaction
False - a change in state is a physical change
In a word equation, the starting chemicals are called...
reactants
products
ingredients
In this chemical reaction, which is the product/s?
Magnesium + Oxygen --> Magnesium oxide
magnesium
magnesium and oxygen
magnesium oxide
oxygen
A material that burns to transfer energy is called a...
compound
wood
fuel
petrol
What is the scientific term given when something burns?
a fuel
flammable
combustion
heating
What does a fuel need in order to burn?
fuel
electricity
oxygen
hydrogen
Sometimes, compounds can be broken down into simpler substances. What type of reaction is this?
combustion
oxidation
decomposition
displacement
In the thermal decomposition of calcium carbonate:
Calcium carbonate --> Calcium oxide + ?
HINT: gas
oxygen
calcium
carbon monoxide
carbon dioxide
What is the conservation of mass?
mass of reactants > mass of products
mass of reactants < mass of products
mass of reactants = mass of products
magnesium + oxygen --> magnesium oxide
If you started with 5g of magnesium and 2.5g of oxygen, what mass of magnesium oxide would be produced?
5g
2.5g
7.5g
10g
When energy is transferred from the substances to the surroundings during a chemical reaction, what type of reaction is this?
endothermic
exothermic
decomposition
combustion
In an endothermic reaction is energy transferred to the surroundings or to the substances?
surroundings
substances
In a chemical reaction, the temperature is measured and it appears to increase. Is this an example of an exothermic or endothermic reaction?
exothermic
endothermic
Which is NOT an example of something you could observe that would suggest a chemical reaction is taking place?
melting
fizzing
smells
temperature change
