WorksheetsLEV KS3 Y7 Chemical Reactions
Total questions: 15
Worksheet time: 8mins
In a chemical reaction, mass will:
Increase
Decrease
Stay the same
What is needed for combustion?
Fuel
Heating
Oxygen
All of the above
What is the correct equation for combustion?
Hydrocarbon + carbon dioxide → water + energy
Hydrocarbon + Oxygen → carbon dioxide + water ( + energy)
Energy + oxygen → Carbon dioxide + water
Hydrocarbon + water → Oxygen + energy
Oxidation is :
The loss of oxygen
The gain of oxygen
When copper carbonate is heated it forms copper oxide and carbon dioxide. What type of reaction is this called?
Oxidation
Reduction
Thermal decompostion
Dispalcement reaction
A reaction that transfers energy to the surrounding is called what?
Endothermic
Exothermic
A reaction that takes in energy from the suroundings is called what?
Endothermic
Exothermic
What is the correct definition for a catalyst?
A substance that slows down a chemical reaction without being changed or used up
A substance that speeds up a chemical reaction but is changed or used up
A substance that speeds up a chemical reaction without being changed or used up
The pH scale ranges from:
0-7
0-14
7-14
1-15
A substance with a pH below 7 is described as :
an alkali
neutral
an acid
A substance with a pH greater than 7 is described as:
an alkali
neutral
an acid
A substance with a pH or 7 is described as:
an alkali
neutral
an acid
An acid will turn universal indicator what colour?
Green
Blue / purple
Red/orange/yellow
Black
An alkali will turn universal indicator what colour?
Blue / purple
Green
Red/ orange/ yellow
black
What colour will pure water turn universal indicator?
Blue / purple
Green
Red / orange / yellow
Black
