Properties and uses of metals

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

Which two elements make up mild steel?

• aluminium and magnesium

• iron and carbon

• copper and zinc

• tin and lead

(a)   is used in light bulbs and distress flares.

Gold and platinum do not react with oxygen in air.

• TRUE

• FALSE

Iron is considered as the most useful metal but its main disadvantage is that it (a)   .

The metal potassium is stored under oil because it rusts.

• TRUE

• FALSE

The salt produced when zinc reacts with nitric acid is (a)   .

What is a major use of aluminium?

• making brass

• making cutlery

• making electrical wiring

• making food containers

Which object is least likely to contain aluminium?

• a bicycle frame

• a saucepan

• a hammer

• an aeroplane body