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Chemistry Unit 2 Stage 8

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Chemistry Unit 2 Stage 8

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About this activity

Lower Secondary

Created by

Safinatus Sabrina
Safinatus Sabrina
Indonesia

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Chemistry Unit 2 Stage 8
 

Chemistry Unit 2 Stage 8Online version

Lower Secondary

by Safinatus Sabrina
1

a liquid that other substances will dissolve in

2

a substance that is dissolved

3

a substance that will not dissolve

4

Choose the correct one

5

Sofia and Zara are planning to investigate the solubility of two different substances, A and B, in water. They want to find out which is the most soluble. Tick (✓) the correct statements that will help them to get the most accurate results. (choose 2)

Choose one or more answers

6

Choose the correct statement (choose 2)

Choose one or more answers

7

Which one is solution. (choose 2)

Choose one or more answers

8

A green powder was placed into a beaker of water. After it was stirred, the water looked cloudy and lumps of powder could still be seen. Has a solution been formed?

9

Choose the correct statements (choose 2)

Choose one or more answers

10

Marcus has added 50 cm3 water to a solution of sodium chloride. He has ____________________________ the solution.

11

36 gram of sodium chloride can be dissolved in 100 gram of the solvent at 20 C. How much sodium chloride would dissolve in 200 gram water at 20 °C?

12

Mia has a solution of copper sulfate labelled X. How she can make up a 100 cm3 solution of copper sulfate that is a quarter as concentrated as solution X.

13

If you have 100 cm3 of water, you would be able to dissolve a lot of sodium chloride in it, but only a tiny amount of lead chloride. Which one has the grater solubility.

14

Variable that we keep the same

15

Variable that we change

16

Variable that we measure, affected by the change that we do on purpose

17

a way of separating coloured substances dissolved in a solution, using special paper

18

a way of separating a solid from a liquid by passing the mixture through a special paper

19

separated colours as the result of chromatography

20

How paper chromatography works: As the water moves up the paper, it carries the ink particles with it. The different kinds of ink particles are carried different distances before they are left behind on the paper. This is because ......

21

Choose the correct statement about how to analyze chromatogram (choose 3)

Choose one or more answers

22

Choose the colours in the purple food colouring (choose 2)

Choose one or more answers

23

Which coloured dyes are present in the food colouring? (choose 2)

Choose one or more answers

24

Choose the subtance in the drink that is not permitted.

25

____________ describes a material through which light can pass.

Written answer

26

Something that is ___________ does not allow light pass through it.

Written answer

27

Choose the correct statements about dissolving (choose 2)

Choose one or more answers

28

When 20 g of salt is added to a beaker containing 100 g of water the salt dissolves and seems to disappear as a solution is formed.

29

Nickel sulfate is a green solid which is soluble in water. Which colour will nickel sulfate solution be?

30

Choose the correct statements. (choose 2)

Choose one or more answers

31

Which one is not the way to increase the rate of dissolving of sugar?

32

Sugar is a white solute that can dissolve in water. Sugar solution would look like a .....

Feedback

They have to carry out the investigation using water at the same temperature to make the test fair. Because the higher the temperature, the more of the substance will dissolve.

milk and blood are mixture

the solution should be transparent. but it is not transparent because there are lumps and it is cloudy. also the green powder was insoluble.

More concentrated --> more solute particles dissolve Diluted solution --> more solvent added, ratio of solute particles getting smaller Dilute solution --> less concentrated

36 x 2 = 72 g

1/4 (quarter) of 100 = 25 g (solute) Solvent = 100 - 25 = 75

more dissolving --> higher solubility

Look at the column labeled "purple" and check which spots (colours) line up horizontally with the pure colour columns. Brown is not included because it is a mixture (several spot)

yellow and green spots match the dyes in the food colouring

Choose the one that not exist in the chromatogram of the permitted chemicals.

- when we dissolve substances, solution formed, No mass has been lost. The mass has been conserved. - Dissolving is physical change, not chemical.

100 + 20 = 120

green solute makes a green solution

higher temperature --> more energy for particle to move solid and liquid --> particle become easier to spread --> more soluble (solubility increase) gas --> particles will escape, instead of dissolve --> less soluble.

 
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