Test
Unit 9 Material Changes Quiz
Preguntas del test (25)
1Two liquids were mixed together in a test tube. Which one of these would NOT show that a chemical reaction had taken place?
- AA The tube got warm.
- BB Bubbles of gas were given off.
- CC A brightly coloured solid formed in the tube.
- DD One of the liquids floated on top of the other.
2Which of these changes is a chemical reaction?
- AA Melting some margarine in a pan
- BB Boiling a kettle of water
- CC Frying an egg
- DD Cooling a drink by putting an ice cube in it.
3 Which statement is true?
- AA All reactions need energy to start them off.
- BB Some reactions need energy to start them off.
- CC All reactions happen when two chemicals are mixed.
- DD All reactions happen very quickly.
4 A chemical reaction:
- AA always produces a gas.
- BB is always reversible.
- CC makes new substances.
- DD does not make new substances.
5 The substances that you get at the end of
The substances that you get at the end of a chemical reaction are called:- AA reactants.
- BB chemicals.
- CC products.
- DD gases.
6Hydrogen gas:
- AA burns with a squeaky pop.
- BB makes a glowing splint relight and burn brightly.
- CC puts a glowing splint out.
- DD turns universal indicator solution red.
7When a fuel burns there is:
- AA a reversible physical change.
- BB a reversible chemical change.
- CC an irreversible physical change.
- DD an irreversible chemical change.
8Which of these candles will burn the longest?
- A
- B
- C
- D
- A
9A mixture is:
- AA just one substance, like pure salt.
- BB two or more things mixed together, like nuts and raisins.
- CC two things joined together, like flour and sugar in a baked cake.
- DD a lot of the same thing put together.
10Salt seems to disappear if you stir it into water. Which statement is true?
- AA The salt dissolves because it is insoluble.
- BB The salt dissolves because it is soluble.
- CC The salt melts because it is soluble.
- DD The salt melts because it is insoluble.
11 When you add salt to water:
- AA the salt is the solvent.
- BB the water is the solute.
- CC the salt is the solute.
- DD the water is the solution.
12 Filtering cannot be used to separate:
- AA sand from a mixture of sand and water.
- BB sugar from sugar solution.
- CC tea leaves from a pot of tea.
- DD leaves from a mixture of leaves and
pond water
13 Most water has chemicals dissolved in it because:
- AA it is pure.
- BB rain water has lots of chemicals dissolved in it.
- CC the water dissolves chemicals from rocks it passes through.
- DD the water dissolves chemicals from the pipes it flows through.
14A solid dissolved in water can be obtained by:
- AA evaporating the liquid.
- BB using a sieve.
- CC using a filter.
- DD freezing the liquid.
15Which sentence is not true?
- AA Rock salt is a mixture of rock and salt.
- BB Rock salt can be used to make pure salt to put on food.
- CC You can get salt from rock salt using a sieve.
- DD You can get salt from rock salt by dissolving, filtering and evaporating.
16Pure water can be made from inky water by:
- AA filtering it.
- BB evaporating it.
- CC distilling it.
- DD adding more water to it.
17 The two steps in distillation are:
.- AA filtering followed by evaporation.
- BB evaporation followed by condensation.
- CC condensation followed by filtering
- DD filtering followed by condensation
18 Distillation can not be used to separate:
- AA sand from sugar.
- BB petrol from crude oil.
- CC pure water from sea water.
- DD alcohol during the production of whisky.
19 Chromatography is:
- AA a way of separating different liquids from each other.
- BB a way of separating different dissolved colours from each other.
- CC a way to separate a liquid from a solid which doesn’t dissolve.
- DD a special way to draw a graph.
20Chromatography will only work if:
- AA a lot of each chemical is used.
- BB the special paper has been warmed before it is used.
- CC the special paper is moved during the experiment.
- DD the chemicals to be separated dissolve in the liquid used.
21The diagram shows a chromatogram.
Which two chemicals are the same?
- AA A and B
- BB C and B
- CC D and F
- DD A and G
22A saturated solution:
- AA is always cold.
- BB has a lot of water in it.
- CC will not dissolve any more solvent.
- DD will not dissolve any more solute.
23You can tell if a solution is saturated because:
- AA it will be transparent.
- BB there will be bits of undissolved solid in it.
- CC it will be coloured.
- DD it will be hot.
24Only 20 g of a salt will dissolve in 100 g of water at room temperature.
If you use hot water instead:- AA less than 20 g will dissolve.
- BB only 20 g will dissolve.
- CC more than 20 g will dissolve.
- DD no salt will dissolve.
25The solubility of a substance is:
.- AA the mass of solute that will dissolve in 100 ml of water
- BB the mass of solvent that will dissolve in 100 ml of water.
- CC the volume of water that 100 g of solute will dissolve in.
- DD the volume of water that 100 g of solvent will dissolve in.
Información
- Descripción
- Quiz for KS3 Grade 7 Unit 9 Material Changes topic.
- Autor
- Jeffrey Piggott
- Idioma
- English
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