L7 - Ionic Compounds

Question 1

what are ionic compounds?

Answer 1

metal + non-metal

Question 2

what is a compound?

Answer 2

when different elements join or bond together

Question 3

What is ionic bonding?

Answer 3

when ions are held together by electrostatic attraction

Question 4

How are ions formed?

Answer 4

when 1 or more electrons are transferred from one atom to another

the simplest ions are simple atoms which have either lost or gained electrons so they have a full outer shell

Question 5

what are the 5 compound ions + their formulas?

Answer 5

Sulfate - SO4 *2-

hydroxide - OH *-

Nitrate - NO3 *-

Carbonate - CO3 * 2-

Ammonium - NH4 *+

Question 6

What is the structure of an ionic compound?

Answer 6

a giant lattice composed of positive and negative ions with electrostatic attractions between them

Question 7

What properties do ionic compounds have?

3

Answer 7

high melting/boiling points

conduct electricity when dissolved or molten

brittle

Question 8

Why do ionic compounds have a high melting/boiling point?

Answer 8

because they have strong electrostatic bonds, lots of energy needed to break

Question 9

Why can ionic compounds conduct electricity when dissolved or molten?

Answer 9

Because the ions that carry the current are free to move in liquid state

Question 10

Why are ionic compounds brittle?

Answer 10

Because the lattice is alternating positive + negative ions

so a blow makes them move next to ions with the same charge