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Topic 2 Element, compounds and mixtures

Last updated 2 months ago

14 Nsɛmmisa

1

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5.

Which of the mixtures P, Q, R or S contains an undissolved solid?

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6.

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7.

2

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1.

write the method

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2.

write the method

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3.

write the method

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4.

write the method

Pure dry crystals of magnesium nitrate can be obtained from magnesium nitrate solution by crystallisation.

These steps describe the method, but the steps are in the wrong order.

A allow the solution to cool to room temperature

B heat the solution to evaporate some of the water

C pour the mixture of crystals and solution through filter paper

D put the crystals in a warm place to dry

E dip a glass rod into the solution to see if crystals form

Write a letter in each box to show the correct order.

One has been done for you.

_ E _ _ _

This is a description of how the orange colouring can be extracted from rose petals.

Ɣ crush the petals using a pestle and mortar

Ɣ add the crushed petals to some ethanol in a beaker

Ɣ heat to about 60^oC and stir to produce an orange solution

Ɣ separate the orange solution from the petals

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8.

Suggest why ethanol is used instead of water

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9.

Ethanol is a flammable liquid. Suggest how it could be heated safely.

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10.

How could the orange solution be separated from the petals?

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11.

see the image

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12.

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13.

What should be placed in A before the mixture from Step 1 is poured through it?

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14.

What is the solid removed in Step 2?