Science Term 2 - Quiz 1 (9G1)

Ceramics are ___________ materials

• metallic

• non-metallic

Porcelain is an electrical insulator. What does this mean?

• It does not allow flow of electricity through it.

• It allows the flow of electricity through it.

• It can conduct electricity.

Select a property of ceramics that is not so useful in the making of test tubes.

• unreactive

• heat resistant

• brittle

• hard

Which new compounds are formed when clay is heated?

• Glass and porcelain

• Porcelain and china

• Bricks and glass

• Silicon and china

On which factor does the size of crystals formed in ceramics depends on?

• temperature

• chemicals in the ceramics

• catalysts used in reactions

• speed of cooling

Porcelain X has much smaller crystals in it than porcelain Y. Suggest a reason for this. (select all the correct answers that applies to the question)

• Porcelain X was cooled down slowly.

• Porcelain Y was cooled down slowly.

• Porcelain X was cooled down faster.

• Porcelain Y was cooled down faster.

Why ceramics are stiff and hard?

• they have molecules made of long chains of repeated atoms.

• they have many atoms bonded to each other with strong bonds in a rigid structure.

• they have high melting points.

Glass is made by melting ____________ at high temperatures.

• sand

• clay

• silicon

• quartz

Choose two raw materials in the below options that can be used to make ceramics.

• sand

• calcium carbonate

• clay

• silicon dioxide

• quartz

Why ceramics have high melting points?

• due to high strength of the bonds between atoms/molecules.

• due to the chemical elements that make up the ceramics.

• due to the long chain of molecules of repeated atoms.