The Particle Model (OCR Gateway GCSE Chemistry)

Exam Questions

35 mins19 questions
1a3 marks

Different mixtures can be separated using different methods.

Draw a line from each separation process to the apparatus used.

Use only one line for each process.

q16a-paper-1-june-2019-ocr-gcse-chem

1b1 mark

A student is given a mixture of iron filings and sulfur powder.

Suggest a method that he could use to separate the iron and sulfur.

1c2 marks

The student heated the mixture to form solid iron sulfide. This is an example of a chemical change.

Write down two ways the student will know a chemical reaction has taken place.

1 ......................................................

2 ......................................................

1d3 marks
i)
The particle model shows how particles are arranged and how they move in solids, liquids and gases.
Describe how the particles are arranged in a solid.

[2]

ii)
Describe how the particles move in a solid.
[1]

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1a6 marks

Magnesium is an element. It is solid at room temperature.

i)
Solid magnesium cannot be compressed.

Why?
[1]
ii)
Solid magnesium cannot flow, but liquid magnesium can flow.

Explain why.
[3]
iii)
Magnesium gas completely fills any container it is put in.

Explain why.
[2]
1b2 marks

Magnesium reacts with water. Magnesium hydroxide, Mg(OH)2, and hydrogen, H2, are made.

Write a balanced symbol equation for this reaction.

1c
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1 mark

Magnesium nitrate has the formula Mg(NO3)2.

Calculate the relative formula mass of magnesium nitrate.

Answer = ...................................... 

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