Metals

Question 1

describe metals

Answer 1

-metals have higher densities , melting / boiling points
(exceptions are grp 1 and mercury )
-good conductor of heat , electricity and are ductile and malleable

Question 2

describe alloys

Answer 2

• mixture of metal and 1 or more elements

- presence of atoms of different sizes therefore is harder than pure metals

Question 3

reaction of potassium with water

Answer 3

react violently with cold water , hydrogen gas ignites and explodes

Question 4

reaction of sodium with water

Answer 4

react violently with cold water , hydrogen gas may catch fire

Question 5

reaction of calcium with water

Answer 5

reacts moderately with cold water

Question 6

reaction of magnesium with water

Answer 6

reacts slowly ,hot magnesium reacts violently with steam nd burns with a white glow

Question 7

reaction of aluminium with water

Answer 7

reaction with steam slows down due to formation of protective oxide layer

Question 8

reaction of zinc with water

Answer 8

hot zinc reacts readily with steam , zinc oxide produced is yellow when hot and white when cold

Question 9

reaction of Iron wit water

Answer 9

hot iron reacts slowly with steam

Question 10

tendency of metals reacting

Answer 10

metals that are more reactive have a higher tendency of forming ions compared to metals that are less reactive