Chemical Changes

Question 1

Acid+ metal oxide

Answer 1

Salt+water

Question 2

Acid+Metal hydroxide

Answer 2

Salt+Water

Question 3

Acid+ Metal

Answer 3

Salt +Hydrogen

Question 4

Acid+ metal carbonate

Answer 4

Salt+water+carbon dioxide

Question 5

Name 3 salts

Answer 5

Chlorides
Sulphates
Nitrates

Question 6

What is a salt

Answer 6

Ionic compounds formed between metals and non metals

Question 7

What for alkalis release when added to water?

Answer 7

OH- ions

Question 8

Test for carbon dioxide gas?

Answer 8

Bubbling gas through lime water

If carbon dioxide is present it will turn the limewater cloudy

Question 9

Precipitation reactions

Answer 9

Produces a solid from two solutions

This happens because the two solutions contain soluble compounds but they make an insoluble compound (the precipitate)

Question 10

What re the solubility rules

Answer 10

Potassium sodium and nitrate salt are soluble
Most chlorides are soluble except lead and silver chlorides

Most sulphates are soluble except lead, barium and calcium sulfates

Most hydroxides, oxides and carbonates are insoluble except potassium and sodium salts

Question 11

Concentration

Answer 11

Amount of substance divided by the volume