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

• metal + acid $\rightarrow$ salt + hydrogen

• metal + acid $\rightarrow$ metal hydroxide + hydrogen

• metal + acid $\rightarrow$ metal oxide + hydrogen

• metal + acid $\rightarrow$ metal oxide

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

Tags

NGSS.MS-ETS1-2

Which two elements make up mild steel?

• aluminium and magnesium

• iron and carbon

• copper and zinc

• tin and lead

Gold and platinum do not react with oxygen in air.

• TRUE

• FALSE

Which object is least likely to contain aluminium?

• a bicycle frame

• a saucepan

• a hammer

• an aeroplane body

Which property do all metals have?

• Their boiling points are low.

• Their densities are low.

• They conduct electricity.

• They react with water.

An alloy is the mixture of metals with metals only.

• TRUE

• FALSE

The gas produced in the reaction of metal carbonate and acid is ______________

• Oxygen

• Carbon Dioxide

• Hydrogen

• Nitrogen

Aluminium and Copper is mixed together to make an alloy which is used for making aeroplane bodies and alloy wheels. What is the name of the alloy?

• Duralumin

• Bronze

• Steel

• Brass

It is the steel which does not rust.

• Fibre
• Stainless
• Plasticine
• Clay