Quick answer: Synthetic materials are substances made by people through chemical reactions, usually from natural resources such as crude oil. This grade 8 science test on synthetic materials has 8 questions worth 20 marks, to do in 45 minutes: key words, raw material and density. The mark scheme is on a separate page; free printable PDF.
This grade 8 science test on synthetic materials test works like a real class test, so the mark scheme is on a separate page, so revise with the lesson first.
This test lasts 45 minutes and is also worth 20 marks. Show your working in calculations and also write units. In addition, in the explanation questions, use the words monomer, polymer and density correctly.
Level: Grade 8 science (Year 9 · Class 8) · Curriculum: MS-PS1-3
Synthetic materials test: the test questions
Question 1 Key words (2 marks)
- Firstly, define the term monomer. (1 mark)
- Then name the process that turns monomers into a polymer. (1 mark)
Question 2 Raw material (2 marks)
- Firstly, state the natural resource from which most plastics are made. (1 mark)
- Then name the plant where it is first separated into fractions. (1 mark)
Question 3 Density (3 marks)
A piece of plastic has a mass of 18.4 g and a volume of 16.0 cm³.
- Firstly, calculate its density. (2 marks)
- Then state whether it floats in water of density 1.00 g/cm³. (1 mark)
Question 4 Float or sink (2 marks)
You place two blocks in water.
- Firstly, state which block has the greater density. (1 mark)
- Then explain your answer. (1 mark)
Question 5 Recycling rate (3 marks)
A town collects 640 kg of plastic and then recycles 160 kg.
- Firstly, calculate the percentage recycled. (2 marks)
- Then calculate the mass not recycled. (1 mark)
Question 6 Conservation of mass (2 marks)
- Since 140 g of ethene reacts completely to make polythene, state the mass of polythene formed. (1 mark)
- Then explain your answer. (1 mark)
Question 7 Natural versus synthetic (3 marks)
- Also, explain two reasons why synthetic materials have replaced many natural ones. (3 marks)
Question 8 Environmental impact (3 marks)
- Firstly, state two problems caused by plastic waste. (2 marks)
- Then suggest one action a school could take. (1 mark)
