Unit 9 Material Changes Quiz

Jeffrey Piggott
Quiz by Jeffrey Piggott, updated more than 1 year ago
Jeffrey Piggott
Created by Jeffrey Piggott over 3 years ago
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Description

Quiz for KS3 Grade 7 Unit 9 Material Changes topic.

Resource summary

Question 1

Question
Two liquids were mixed together in a test tube. Which one of these would NOT show that a chemical reaction had taken place?
Answer
  • A The tube got warm.
  • B Bubbles of gas were given off.
  • C A brightly coloured solid formed in the tube.
  • D One of the liquids floated on top of the other.

Question 2

Question
Which of these changes is a chemical reaction?
Answer
  • A Melting some margarine in a pan
  • B Boiling a kettle of water
  • C Frying an egg
  • D Cooling a drink by putting an ice cube in it.

Question 3

Question
Which statement is true?
Answer
  • A All reactions need energy to start them off.
  • B Some reactions need energy to start them off.
  • C All reactions happen when two chemicals are mixed.
  • D All reactions happen very quickly.

Question 4

Question
A chemical reaction:
Answer
  • A always produces a gas.
  • B is always reversible.
  • C makes new substances.
  • D does not make new substances.

Question 5

Question
The substances that you get at the end of The substances that you get at the end of a chemical reaction are called:
Answer
  • A reactants.
  • B chemicals.
  • C products.
  • D gases.

Question 6

Question
Hydrogen gas:
Answer
  • A burns with a squeaky pop.
  • B makes a glowing splint relight and burn brightly.
  • C puts a glowing splint out.
  • D turns universal indicator solution red.

Question 7

Question
When a fuel burns there is:
Answer
  • A a reversible physical change.
  • B a reversible chemical change.
  • C an irreversible physical change.
  • D an irreversible chemical change.

Question 8

Question
Which of these candles will burn the longest?

Question 9

Question
A mixture is:
Answer
  • A just one substance, like pure salt.
  • B two or more things mixed together, like nuts and raisins.
  • C two things joined together, like flour and sugar in a baked cake.
  • D a lot of the same thing put together.

Question 10

Question
Salt seems to disappear if you stir it into water. Which statement is true?
Answer
  • A The salt dissolves because it is insoluble.
  • B The salt dissolves because it is soluble.
  • C The salt melts because it is soluble.
  • D The salt melts because it is insoluble.

Question 11

Question
When you add salt to water:
Answer
  • A the salt is the solvent.
  • B the water is the solute.
  • C the salt is the solute.
  • D the water is the solution.

Question 12

Question
Filtering cannot be used to separate:
Answer
  • A sand from a mixture of sand and water.
  • B sugar from sugar solution.
  • C tea leaves from a pot of tea.
  • D leaves from a mixture of leaves and pond water

Question 13

Question
Most water has chemicals dissolved in it because:
Answer
  • A it is pure.
  • B rain water has lots of chemicals dissolved in it.
  • C the water dissolves chemicals from rocks it passes through.
  • D the water dissolves chemicals from the pipes it flows through.

Question 14

Question
A solid dissolved in water can be obtained by:
Answer
  • A evaporating the liquid.
  • B using a sieve.
  • C using a filter.
  • D freezing the liquid.

Question 15

Question
Which sentence is not true?
Answer
  • A Rock salt is a mixture of rock and salt.
  • B Rock salt can be used to make pure salt to put on food.
  • C You can get salt from rock salt using a sieve.
  • D You can get salt from rock salt by dissolving, filtering and evaporating.

Question 16

Question
Pure water can be made from inky water by:
Answer
  • A filtering it.
  • B evaporating it.
  • C distilling it.
  • D adding more water to it.

Question 17

Question
The two steps in distillation are: .
Answer
  • A filtering followed by evaporation.
  • B evaporation followed by condensation.
  • C condensation followed by filtering
  • D filtering followed by condensation

Question 18

Question
Distillation can not be used to separate:
Answer
  • A sand from sugar.
  • B petrol from crude oil.
  • C pure water from sea water.
  • D alcohol during the production of whisky.

Question 19

Question
Chromatography is:
Answer
  • A a way of separating different liquids from each other.
  • B a way of separating different dissolved colours from each other.
  • C a way to separate a liquid from a solid which doesn’t dissolve.
  • D a special way to draw a graph.

Question 20

Question
Chromatography will only work if:
Answer
  • A a lot of each chemical is used.
  • B the special paper has been warmed before it is used.
  • C the special paper is moved during the experiment.
  • D the chemicals to be separated dissolve in the liquid used.

Question 21

Question
The diagram shows a chromatogram. Which two chemicals are the same?
Answer
  • A A and B
  • B C and B
  • C D and F
  • D A and G

Question 22

Question
A saturated solution:
Answer
  • A is always cold.
  • B has a lot of water in it.
  • C will not dissolve any more solvent.
  • D will not dissolve any more solute.

Question 23

Question
You can tell if a solution is saturated because:
Answer
  • A it will be transparent.
  • B there will be bits of undissolved solid in it.
  • C it will be coloured.
  • D it will be hot.

Question 24

Question
Only 20 g of a salt will dissolve in 100 g of water at room temperature. If you use hot water instead:
Answer
  • A less than 20 g will dissolve.
  • B only 20 g will dissolve.
  • C more than 20 g will dissolve.
  • D no salt will dissolve.

Question 25

Question
The solubility of a substance is: .
Answer
  • A the mass of solute that will dissolve in 100 ml of water
  • B the mass of solvent that will dissolve in 100 ml of water.
  • C the volume of water that 100 g of solute will dissolve in.
  • D the volume of water that 100 g of solvent will dissolve in.
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