Rusting and Property exceptions

Question 1

What reaction is rusting an example of?

Answer 1

Rusting is a destructive example of an oxidation reaction where the iron oxidizes to form iron oxide.

Question 2

Name some metallic coating methods to prevent rusting.

Answer 2

Alloying - Iron mixed with a small amount of nickel and chromium.
Galvanizing - Coated with zinc by dipping iron sheets in molten zinc.

Question 3

What are the non-metals with good electrical conductivity?

Answer 3

Graphite and gas carbon

Question 4

Which metal has the highest melting point?

Answer 4

Tungsten is a metal with the highest melting point of 3,422 °C.

Question 5

Where is zinc used and why?

Answer 5

Zinc is used in galvanizing iron and in dry cells as it has an electropositive nature which is more than iron and loses electrons easily which prevents iron from reacting and rusting.

Question 6

Why is magnesium used in fireworks?

Answer 6

It burns with a dazzling light.

Question 7

Which are the only two metals which exist at liquid state at room temperature?

Answer 7

Mercury and gallium

Question 8

Which is the best and poorest conductor of heat?

Answer 8

Best - Silver

Poorest - Lead

Question 9

Do metals have high or low densities?

Answer 9

High. Iridium and osmium have the highest densities.

Question 10

Does mercury have a low boiling or melting point?

Answer 10

Low boiling point.