Unit 9 Material Changes Quiz

Descripción

Quiz for KS3 Grade 7 Unit 9 Material Changes topic.
Jeffrey Piggott
Test por Jeffrey Piggott, actualizado hace más de 1 año
Jeffrey Piggott
Creado por Jeffrey Piggott hace más de 6 años
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Resumen del Recurso

Pregunta 1

Pregunta
Two liquids were mixed together in a test tube. Which one of these would NOT show that a chemical reaction had taken place?
Respuesta
  • 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.

Pregunta 2

Pregunta
Which of these changes is a chemical reaction?
Respuesta
  • 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.

Pregunta 3

Pregunta
Which statement is true?
Respuesta
  • 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.

Pregunta 4

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

Pregunta 5

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

Pregunta 6

Pregunta
Hydrogen gas:
Respuesta
  • 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.

Pregunta 7

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

Pregunta 8

Pregunta
Which of these candles will burn the longest?

Pregunta 9

Pregunta
A mixture is:
Respuesta
  • 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.

Pregunta 10

Pregunta
Salt seems to disappear if you stir it into water. Which statement is true?
Respuesta
  • 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.

Pregunta 11

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

Pregunta 12

Pregunta
Filtering cannot be used to separate:
Respuesta
  • 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

Pregunta 13

Pregunta
Most water has chemicals dissolved in it because:
Respuesta
  • 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.

Pregunta 14

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

Pregunta 15

Pregunta
Which sentence is not true?
Respuesta
  • 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.

Pregunta 16

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

Pregunta 17

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

Pregunta 18

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

Pregunta 19

Pregunta
Chromatography is:
Respuesta
  • 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.

Pregunta 20

Pregunta
Chromatography will only work if:
Respuesta
  • 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.

Pregunta 21

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

Pregunta 22

Pregunta
A saturated solution:
Respuesta
  • 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.

Pregunta 23

Pregunta
You can tell if a solution is saturated because:
Respuesta
  • 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.

Pregunta 24

Pregunta
Only 20 g of a salt will dissolve in 100 g of water at room temperature. If you use hot water instead:
Respuesta
  • 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.

Pregunta 25

Pregunta
The solubility of a substance is: .
Respuesta
  • 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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