7h Solutions Test Sen 2004

You may write on this sheet

Name ______________________

Tutor Group _________

For questions 1 to 8 circle the correct word from the brackets to make each sentence correct 1.

2.

3.

4.

5.

6.

Salt dissolves in water so the mixture is (soluble/clear/insoluble) after shaking.

Substance

We say salt is (soluble/clear/insoluble) in water.

Water

Sand does not dissolve in water. We say it is (soluble/clear/insoluble).

Substance

Clear

Shake

A liquid that can dissolve another substance is called a (solvent/solution/solute). A substance that can dissolve in a liquid is called a (filtrate/solvent/solution/solute). The warmer a cup of tea is, the more sugar will be able to dissolve in it. We say that the warmer the tea, the greater the (speed/solubility/saturation) of the sugar.

7. If no more sugar can be dissolved in a cup of water, then the solution is said to be (soluble/full/residue/saturated). 8.

9.

If a mixture of chalk and water is filtered using a filter paper and funnel, the clear water that passes through the paper is known as the (residue/solute/filtrate). If 30 grams of salt are dissolved into 120 grams of water to make a salt solution, how much will the salt solution weigh (in grams)? ________________

10.

Without using the word "dissolved" in your answer, describe what has happened to the salt particles in question 9.__________________________________

_____________________________________________________________

11.

Water is not a solvent for grease. This means that grease is ….. (circle the correct answer). A insoluble in water

B soluble in water

C insoluble in anything except water D insoluble in any liquid 12. Which statement is wrong? (circle your answer). A sugar is soluble in water

B sugar dissolves in water

C sugar is the solute in a sugar solution

D sugar melts in water

13. The box contains the names of substances you find in the kitchen. Circle the three that are soluble in water. sugar

salt

jelly

rice

flour

tea

leaves Complete the sentences to answer questions 14 to 16 using the words from the box. distillation

chromatography

evaporation

filtration

.

14. To separate the colours in ink we use a process called ____________________ 15.

To get clear water from salt solution we use a process called _______________

16.

To get clear water from muddy water we use a process called ______________.

17.

To get salt crystals from salt solution we use a process called _______________.

18. Put the following sentences in order to describe how you would get pure salt from rock salt (a mixture of salt and sand). A) We would add hot water to the mixture and stir with a stirring rod. B) We would crush up the rock salt with a mortar and pestle C) We would gently warm the filtrate in an evaporating basin. D) We would carefully filter the mixture using a funnel and filter paper 1st __________

2nd __________

3rd ____________

4th___________

Which one of the following (A, B, C, or D) describes the process of distillation?

Circle the correct answer.

A evaporation followed by condensation B condensation followed by evaporation C evaporation followed by crystallisation D condensation followed by boiling

This diagram shows the results of

Level reached by solvent front

a chromatography experiment to identify an unknown ink mixture. Five different ink dots are drawn on the base line. Answer the questions 20 to 22.

19.

Baseline Ink mixture

Ink 1

Ink 2

Ink 3

Ink 4

What would be a suitable solvent for this experiment? __________________________________________________

21. Why do the ink dots move upwards? _________________________________ ____________________________________________________________ 20. Which of inks 1,2,3 and 4 is the ink mixture made up from? ____________________________________________________________

The diagram shows some apparatus used for the distillation of inky water. For questions 23-25 circle the correct answer. 23. Which label on the diagram shows where the inky water is? A B C D E 24. Which label shows where there is pure water? A B C D E 25. Which label shows where condensation is happening? A B C D E 26. Describe what there is in the round bottom flask at position B. _____________________________________ A pupil measures how much sugar will dissolve in water at different temperatures. These are her results. Temperature (oC)

0

20

40

60

80

Amount of sugar that will dissolve (g)

14

20

29

40

56

27.

At which temperature did the most sugar dissolve? ______________

28.

Describe one thing the pupil must have done to ensure this was a fair test.

______________________________________________________________ 29.

What could the pupil do to be sure these results were reliable?

______________________________________________________________ 30.

Describe the relationship between the temperature of the water and the amount of sugar that will dissolve. __________________________________ ___________________________________________________________

Well done! Now go back and check your work to make sure you haven’t made any silly mistakes.