Chemical Classification

Question 1

What are the atoms of elements in a compound held together by?

Answer 1

Chemicals bonds

Question 2

How do the ionic bonds form?

Answer 2

Metal atoms lose one or more electrons to form positive ions - non metal atoms gain electrons to form negative ions they form when a metal reacts with a non metal.

Question 3

How do simple and giant molecular covalent form?

Answer 3

Atoms share electrons to get a full outer shell - covalent bonds holds atoms together in molecules. Covalent bonds form between atoms of non-metal elements.

Question 4

Give an example of an ionic, simple and giant molecular covalent bond

Answer 4

Ionic, sodium chloride.
Simple molecular covalent, water and oxygen
Quartz (main mineral in sand).

Question 5

What is the relative melting and boiling points for ionic, simple molecular covalent and giant molecular covalent?

Answer 5

Ionic - high, solids at room temperature
Low - most simple molecular covalent substances are liquids or gases at room temperature
Giant molecular covalent - high solids at room temperature.

Question 6

What is the relative solubility of ionic, simple and giant molecular covalent bonds?

Answer 6

Ionic - many dissolve in water
Simple - some dissolve in water
Giant - insoluble in water

Question 7

What is the relative conductivity of electricity in ionic, simple and giant molecular covalent bond?

Answer 7

Ionic, conduct electricity when molten or in a solution - do not conduct when solid.
Simple, do not conduct electricity
Giant, do not conduct electricity except graphite which is a conducter

Question 8

How are elements and compounds classified?

Answer 8

Ionic, simple molecular covalent, giant molecular covalent, metallic