Topic 4 = Chemical Changes

Question 1

Reactivity Order

Answer 1

Potassium
Sodium
Lithium
Calcium
Magnesium
Zinc
Iron
Copper
Silver
Gold

Question 2

What does OIL RIG stand for?

Answer 2

Oxidation Is Lose

Reduction Is Gained

Question 3

3 Ways to make a Soluble Salt

Answer 3

Acid + Base —> Salt+ Water
Acid + Alkali——> Salt+ water
Acid+ Metal——-> Salt+ Hydrogen

Question 4

What are strong acids?

Answer 4

strong acids fully dissociate into ions when dissolved.no molecules left of original and its not reversible

Question 5

What are weak acids?

Answer 5

weak acids don’t fully dissociate.only some dissociate and change is reversible

Question 6

What is a concentrated solution?

Answer 6

have high number of molecules dissolved per dm. a high concentration of h+ mean lows PH

Question 7

What is a dilute solution?

Answer 7

have low number of molecules dissolved per dm. lower concentration of h+ means higher PH - more neutral

Question 8

What is electrolysis?

Answer 8

The breaking down of a molten or Aqueous ionic compound using electricity.