Year 9- Chemistry Test 1

What are polymers more commonly known as?

• Polymers

• Ceramics

• Plastics

• None of the above

Which of the following is a ceramic material?

• steel

• glass

• cement

• polythene

Pottery and china are suitable for making tea pots because they are:

• brittle

• transparent.

• heat insulators

• non-conductors of electricity.

Which of these statements about the formation of solid crystals is correct?

• Rapid cooling produces the largest crystals as the atoms quickly form molecules.

• Slow cooling produces the largest crystals as the atoms have time to form a regular lattice.

• Rapid cooling produces the largest crystals as it allows more bonds to form in the lattice.

• Slow cooling produces the largest crystals as the atoms can form lots of molecules.

Which of the following is a synthetic polymer?

• Sand

• Concrete

• Rubber

• PVC

Some polymerisation reactions are endothermic. What does this mean?

• The polymers are made by burning oil.

• The formation of the polymers transfers heat into the surroundings.

• The polymers are made by breaking up long chain molecules.

• The formation of the polymers makes the surrounding temperature decrease.

Vulcanisation is the process of adding cross-links to sulfur. How does this process change the natural properties of the rubber?

• It makes the rubber softer but it is still easy to melt.

• It makes the rubber harder and easy to melt.

• It makes the rubber harder but it is still elastic.

• It makes the rubber more flexible and easier to melt.

Which of the following shows a substance that would have a high melting point but a brittle structure?

• 
• 
• 
• 

Which is the main source of raw materials for making poly(ethene)?

• Coal

• Crude oil

• Natural Gas

• Iron ore

Nylon and poly(ethene) are examples of a polymer. Which property makes nylon useful in climbing ropes?

• opaque

• good heat insulator

• low melting point

• very strong