12220336
Descripción
Test por Jeffrey Piggott, actualizado hace más de 1 año
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Creado por Jeffrey Piggott
hace casi 7 años
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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
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A The tube got warm.
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B Bubbles of gas were given off.
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C A brightly coloured solid formed in the tube.
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D One of the liquids floated on top of the other.
Pregunta 2
Pregunta
Which of these changes is a chemical reaction?
Respuesta
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A Melting some margarine in a pan
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B Boiling a kettle of water
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C Frying an egg
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D Cooling a drink by putting an ice cube in it.
Pregunta 3
Pregunta
Which statement is true?
Respuesta
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A All reactions need energy to start them off.
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B Some reactions need energy to start them off.
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C All reactions happen when two chemicals are mixed.
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D All reactions happen very quickly.
Pregunta 4
Pregunta
A chemical reaction:
Respuesta
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A always produces a gas.
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B is always reversible.
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C makes new substances.
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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
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A reactants.
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B chemicals.
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C products.
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D gases.
Pregunta 6
Pregunta
Hydrogen gas:
Respuesta
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A burns with a squeaky pop.
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B makes a glowing splint relight and burn brightly.
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C puts a glowing splint out.
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D turns universal indicator solution red.
Pregunta 7
Pregunta
When a fuel burns there is:
Respuesta
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A a reversible physical change.
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B a reversible chemical change.
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C an irreversible physical change.
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D an irreversible chemical change.
Pregunta 8
Pregunta
Which of these candles will burn the longest?
Respuesta
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Image:A 150 (binary/octet-stream)
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Image:B 200 (binary/octet-stream)
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Image:C 150 (binary/octet-stream)
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Image:D 100 (binary/octet-stream)
Pregunta 9
Pregunta
A mixture is:
Respuesta
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A just one substance, like pure salt.
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B two or more things mixed together, like nuts and raisins.
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C two things joined together, like flour and sugar in a baked cake.
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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
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A The salt dissolves because it is insoluble.
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B The salt dissolves because it is soluble.
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C The salt melts because it is soluble.
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D The salt melts because it is insoluble.
Pregunta 11
Pregunta
When you add salt to water:
Respuesta
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A the salt is the solvent.
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B the water is the solute.
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C the salt is the solute.
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D the water is the solution.
Pregunta 12
Pregunta
Filtering cannot be used to separate:
Respuesta
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A sand from a mixture of sand and water.
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B sugar from sugar solution.
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C tea leaves from a pot of tea.
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D leaves from a mixture of leaves and pond water
Pregunta 13
Pregunta
Most water has chemicals dissolved in it because:
Respuesta
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A it is pure.
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B rain water has lots of chemicals dissolved in it.
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C the water dissolves chemicals from rocks it passes through.
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D the water dissolves chemicals from the pipes it flows through.
Pregunta 14
Pregunta
A solid dissolved in water can be obtained by:
Respuesta
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A evaporating the liquid.
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B using a sieve.
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C using a filter.
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D freezing the liquid.
Pregunta 15
Pregunta
Which sentence is not true?
Respuesta
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A Rock salt is a mixture of rock and salt.
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B Rock salt can be used to make pure salt to put on food.
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C You can get salt from rock salt using a sieve.
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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
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A filtering it.
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B evaporating it.
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C distilling it.
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D adding more water to it.
Pregunta 17
Pregunta
The two steps in distillation are:
.
Respuesta
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A filtering followed by evaporation.
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B evaporation followed by condensation.
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C condensation followed by filtering
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D filtering followed by condensation
Pregunta 18
Pregunta
Distillation can not be used to separate:
Respuesta
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A sand from sugar.
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B petrol from crude oil.
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C pure water from sea water.
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D alcohol during the production of whisky.
Pregunta 19
Pregunta
Chromatography is:
Respuesta
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A a way of separating different liquids from each other.
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B a way of separating different dissolved colours from each other.
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C a way to separate a liquid from a solid which doesn’t dissolve.
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D a special way to draw a graph.
Pregunta 20
Pregunta
Chromatography will only work if:
Respuesta
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A a lot of each chemical is used.
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B the special paper has been warmed before it is used.
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C the special paper is moved during the experiment.
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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
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A A and B
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B C and B
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C D and F
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D A and G
Pregunta 22
Pregunta
A saturated solution:
Respuesta
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A is always cold.
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B has a lot of water in it.
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C will not dissolve any more solvent.
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D will not dissolve any more solute.
Pregunta 23
Pregunta
You can tell if a solution is saturated because:
Respuesta
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A it will be transparent.
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B there will be bits of undissolved solid in it.
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C it will be coloured.
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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
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A less than 20 g will dissolve.
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B only 20 g will dissolve.
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C more than 20 g will dissolve.
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D no salt will dissolve.
Pregunta 25
Pregunta
The solubility of a substance is:
.
Respuesta
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A the mass of solute that will dissolve in 100 ml of water
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B the mass of solvent that will dissolve in 100 ml of water.
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C the volume of water that 100 g of solute will dissolve in.
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D the volume of water that 100 g of solvent will dissolve in.
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