Properties of Metals and Alloys

Brass is a mixture of

• copper and zinc

• silver and gold

• zinc and iron

• carbon and copper

Why do jewelers not create jewelry with pure gold, silver, or copper?

• It is a soft metal, so it will rub or scratch away over time.

• It will not be shiny.

• It is impossible to find a pure form of these metals.

• It is too hard to shape into a design.

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Which of these objects are manufactured from metals?

• 
• 
• 
• 
• 

Why are cords for toasters, televisions, and phone chargers made of metal wires?

• metals are shiny

• metals are good conductors of heat

• metals are good conductors of electricity

• metals are magnetic

This is the structure of alloys.

• TRUE

• FALSE

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Which of the following is an alloy?

• Aluminium

• Brass

• Air

• Sodium chloride

Which of the following alloy is made up of copper and tin?

• bronze

• brass

• stainless steel

• pewter

Why is alloy hard and strong?

• due to strong metallic bond between the elements

• atoms are regularly arranged and can act as lubricant

• it is made up of mixture of metals

• due to mismatched size of atoms and these atoms cant slide past each other

Which of the following equation is correct when metals react with acids?

Which metal would be suitable for all of the following uses?
# Making aircraft bodies
# Making food containers
# Making overhead power cables

• aluminium

• mild steel

• gold

• pure iron

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