Q5. the table below shows the melting points and boiling points of four elements
melting point (°c) boiling point (°c)
357
-39
element
mercury
copper
nitrogen
calcium
1085
2562
-210
-196
842
1484
answer the following using the table above. which element in the table is:
(i) a liquid at 0°c?
(ii) a solid at 1000°c?
(iii) a gas at 500°c?
(iv) what state is nitrogen at -200°c?

i. Mercury

ii. copper

iii. Mercury

iv.Nitrogen becomes a liquid at -200°C. Liquid nitrogen looks like water

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.