Cambridge Secondary (7-9). Stage 8. MCE Science. Workbook - Unit 5: Mixtures and Solubility

Question 1

You have read that mixing iron and carbon (both pure substances) creates steel with properties different from each of the substances it is made up of. What other examples of mixtures with helpful combined properties can you think of?

Question 2

Circle the correct answer for each substance.

salt water

pure substance / mixture

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Question 3

Circle the correct answer for each substance.

iron

pure substance / mixture

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Question 4

Circle the correct answer for each substance.

air

pure substance / mixture

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Question 5

Circle the correct answer for each substance.

cake batter

pure substance / mixture

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Question 6

Choose words from the box to complete the sentences.

Words: simplest; saturated solution; chemical; compounds; physical; mixture; pure substance.

A __________ is made up of only one type of element or compound, while a __________ contains more than one element or compound.

Question 7

Choose words from the box to complete the sentences.

Words: simplest; saturated solution; chemical; compounds; physical; mixture; pure substance.

Elements are the __________ building blocks of matter, while __________ are formed from two or more elements that are chemically joined together.

Question 8

Choose words from the box to complete the sentences.

Words: simplest; saturated solution; chemical; compounds; physical; mixture; pure substance.

A mixture can be separated into its components using __________ methods, but a compound can only be separated by __________ methods.

Question 9

Describe the difference between a homogeneous mixture and a heterogeneous mixture. Give an example of each type of mixture.

a homogeneous mixture

Question 10

Describe the difference between a homogeneous mixture and a heterogeneous mixture. Give an example of each type of mixture.

b heterogeneous mixture

Question 11

Can a pure substance be separated into its components by physical means like filtration or evaporation? Explain your answer.

Question 12

Air is a mixture. How is air different from a compound, such as water?

Question 13

Complete the diagram to show how matter can be classified.

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Question 14

You have a bowl of mixed candy containing large chocolate pieces, jelly sweets and small candy-coated chocolate balls. Describe how you would separate this mixture using at least two different techniques.

Question 15

Draw lines to match the technique with its description.

Techniques: filtration; magnetic separation; evaporation.

Descriptions:
- Uses a magnet to attract certain materials
- Separates a liquid from a solid using filter paper
- Allows a liquid to change into a gas, leaving behind the dissolved solid