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- 1. Multiple Choice
The dependent variable is the variable that will be changed during an investigation.
True
False
- 2. Multiple Choice
In which step of the scientific method do we want to use graphs?communicate resultsasking questionsanalyze datamake a hypothesis - 3. Multiple Choice
A student uses the apparatus shown in the diagram below to measure the volume of carbon dioxide gas made when different masses of marble chips are added to 25cm3 of dilute hydrochloric acid. Which other items of apparatus are needed?
funnel and balance
funnel and stopwatch
measuring cylinder and balance
measuring cylinder and stopwatch
- 4. Multiple Choice
A student measures the rate of two reactions.
In one reaction, there is a change in mass of the reactants during the reaction. In the second reaction, there is a change in temperature during the reaction. Which piece of apparatus would be essential in both experiments?
balance
clock
pipette
thermometer
- 5. Multiple Choice
Part of the instructions in an experiment reads as follows. Quickly add 50 cm3 of acid. What is the best piece of apparatus to use?
a burette
a conical flask
a measuring cylinder
a pipette
- 6. Multiple Choice
A student was provided with only a thermometer, a stopwatch and a beaker. What could the student measure?
10.5 g solid and 24.8 cm3 liquid
10.5 g solid and 25 °C
24.8 cm3 liquid and 45 seconds
25 °C and 45 seconds
- 7. Multiple Choice
A student takes 2 g samples of calcium carbonate and adds them to 20 cm3 samples of dilute hydrochloric acid at different temperatures. She measures how long it takes for the effervescence to stop.
Which apparatus does she use?A
A
B
C
D
- 8. Multiple Choice
Which two methods can be used to separate a salt from its solution in water?
1 crystallisation
2 decanting
3 distillation
4 filtration
1 and 2
1 and 3
2 and 3
3 and 4
- 9. Multiple Choice
Mixture 1 contains sand and water. Mixture 2 contains salt and water.
Which method of separation could be used to obtain each of the required products from each mixture?
A
B
C
D
- 10. Multiple Choice
A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. He adds magnesium carbonate until no more reacts.
Which process should he use for the next stage?
crystallisation
evaporation
filtration
neutralisation
- 11. Multiple Choice
A student separates salt from a mixture of salt and sand. What is the correct order of steps for the student to take?
filter → evaporate → shake with water
filter → shake with water → evaporate
shake with water → evaporate → filter
shake with water → filter → evaporate
- 12. Multiple Choice
During a reaction, the following changes take place.
1 The temperature rises.
2 A gas is given off.
Which apparatus is required to measure the rate of this reaction?
balance and burette
balance and gas syringe
gas syringe and burette
gas syringe and stopclock
- 13. Multiple Choice
A method used to make copper(II) sulfate crystals is shown.
1 Place dilute sulfuric acid in a beaker.
2 Warm the acid.
3 Add copper(II) oxide until it is in excess.
4 Filter the mixture.
5 Evaporate the filtrate until crystals start to form.
6 Leave the filtrate to cool.
What are the purposes of step 3 and step 4?
A
B
C
D
- 14. Multiple Choice
An experiment, S, is carried out to measure the volume of hydrogen produced when excess dilute sulfuric acid is added to zinc.
A second experiment, T, is carried out using the same mass of zinc but under different conditions.
The results of the two experiments are shown.
Which changes in the conditions between experiments S and T give curve T?
A
B
C
D
- 15. Multiple Choice
The results of two separate reactions between excess calcium carbonate and hydrochloric acid are shown.
Which statement explains the differences between the reactions?
More calcium carbonate was used in the second reaction.
The same volume of more concentrated acid was used in the second reaction.
The second reaction was allowed to react for longer.
The temperature was higher in the second reaction.
- 16. Multiple Choice
Magnesium is reacted with a dilute acid.
The hydrogen gas is collected and its volume measured. The results are shown on the graph.
Between which times was the reaction fastest?
0 and 1 minute
1 and 2 minutes
2 and 3 minutes
7 and 8 minutes
- 17. Multiple Choice
The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction changes with temperature.
The reaction is endothermic.
The reaction is exothermic.
The reaction produces a gas.
The reaction produces an acid.
- 18. Multiple Choice
Powdered marble reacts with hydrochloric acid using the apparatus shown. The gas syringe fills in 36 seconds.
The experiment is repeated using marble chips in place of powdered marble. How long does it take to fill the gas syringe in this experiment?
9 seconds
18 seconds
36 seconds
72 seconds
- 19. Multiple Choice
The diagram shows an experiment to measure the rate of a chemical reaction.
Which change decreases the rate of reaction?
adding water to the flask
heating the flask during the reaction
using more concentrated acid
using powdered metal
- 20. Multiple Choice
Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?
A
B
C
D
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