Grade 7 5.3 Metal Mixtures

What is an alloy?

• A metal that rusts
• A metal that is pure
• A mixture of metals
• A type of compound

Which metal is mixed with copper to make bronze?

• Tin
• Zinc
• Copper
• Iron

Why is steel stronger than pure iron?

• It melts easily
• It has carbon
• It is more colourful
• It conducts better

Which alloy is used in hip replacements?

• Duralumin
• Steel
• Titanium alloy
• Aluminium

Why are coins made from alloys instead of pure metals?

• They are heavier
• They look better
• They are softer
• They are expensive

What property makes shape memory alloys useful for glasses?

• Hardness
• Flexibility
• Shape memory
• Transparency

Which two metals make brass?

• Copper and tin
• Copper and zinc
• Zinc and lead
• Aluminium and copper

What does 24 carat gold mean?

• All gold
• It is soft
• 24 parts pure gold
• 18 parts pure gold

Why do we not use pure aluminium for aircraft?

• Too expensive
• Too weak
• Too strong
• Heavier

What is the main property of Nitinol?

• Super strong
• Shape memory
• Magnetic property
• Elasticity