Year 9 materials

Which of the following are properties of ceramics?

• malleable

• brittle

• low melting point

• good conductor of electricity

Why are ceramics brittle?

• The molecules are not bonded to each other strongly

• Their atoms are held in a rigid structure

• They are made from natural materials

• They are manmade

Why do ceramics have high melting points?

• Because lots of weak bonds need to be broken

• Because they are elastic

• Because lots of strong bonds need to be broken

• Because they are not biodegradable.

Which of the following is an example of a ceramic material?

• Glass

• PVC

• Copper

• GRP

What are polymers formed from?

• Polythene

• Aggregates

• Monomers

• Potatoes

What is used to vulcanise rubber?

• Sodium

• Sulfur

• Carbon

• Water

Which type of reaction transfers energy from reactants to their surroundings?

• Exothermic

• Endothermic

What is formed during thermal decomposition of calcium carbonate?

• Calcium oxide and oxygen

• Calcium oxide and carbon dioxide

• Calcium and carbon dioxide

• Calcium carbonate and oxygen

Which of the following is a composite material used to make boats?

• Concrete

• GRP

• Safety glass

• Kevlar

Which of the following can conduct electricity?

• Starch

• Vulcanised rubber

• Copper

• Pottery