Possible Questions

Question 1

Explain why lake and seawater are good conductors of electricity while pure water is not.

Answer 1

Seawater and lake water are good conductors of electricity because they contain many ions. Pure water does not contain the ions

Question 2

Why do some substances have no odour, and what relation does this have with the attraction of the particles?

Answer 2

Substances with no odour consist of particles with very strong attraction. When the particles are tightly compacted, the odour can’t escape/

Question 3

If a substance:
-has a high melting point
-is hard
-is able to form electrolytes
-is soluble,
then is it ionic or covalent? Provide an explanation.

Answer 3

This is an ionic compound because these are all characteristics that a ionic compound consists of.

Question 4

What is the Law of Conservation of Mass

Answer 4

In any given chemical reaction, the total mass of the reactants equals to the total mass of the products.