Chemical changes

Question 1

Acids and alkalis

Answer 1

Acids = PH 1-6
Neutral = PH 7
Alkaline = PH = more than 7

Question 2

How are salts made?

Answer 2

Acids react with metals or ammonium. Salt is formed by replacing hydrogen ions in the acids with metal ions.

Question 3

SALT WORD PROCESS

Answer 3

Acid + metal = salt + hydrogen

Question 4

Strong acid

Answer 4

ALL ions dissociate into H+ ions

Question 5

Why are all Alkali’s bases but not all bases are Alkali’s?

Answer 5

All alkali’s are soluble in water

Question 6

Cation

Answer 6

Positive ion

Question 7

Anion

Answer 7

Negative ions

Question 8

Which electrode do anions and cations go to

Answer 8

Cations go to anode
Anions go to Cathode
OPPOSITES ATTRACT

Question 9

What occurs at each electode?

Answer 9

Cations gain electrons

Anions lose electrons

Question 10

During the electrolysis of water what happens?

Answer 10

Small proportion of molecules dissociate into ions. H+ ions go to cathode - become hydrogen gas.
OH- ions go to anode - become Oxygen gas.

Volume of hydrogen is 2x the amount of oxygen given off

Question 11

What are electrolytes?

Answer 11

Ionic compounds in a molten state or ones dissolved in water.