chemistry specification part 4

Question 1

what is a strong acid?

Answer 1

an acid that ionises almost completely in solution to release hydrogen ions

Question 2

how does changing the concentration of acid affect its ph?

Answer 2

if the concentration of H+ ions increases by a factor of 10 then the ph decreases by 1.
If the concentration of H+ ions decreases by a factor of 10 then the ph increases by 1.

Question 3

what do acids and metal oxide produce?

Answer 3

salt and water

Question 4

what do acids and metal hydroxides produce?

Answer 4

salt and water

Question 5

what do acids and metals produce?

Answer 5

metal salts and hydrogen

Question 6

what is the chemical test for hydrogen?

Answer 6

lit splint makes a squeaky pop sound

Question 7

what do acids and metal carbonates produce?

Answer 7

salt and water and carbon dioxide

Question 8

what is the chemical test for carbon dioxide?

Answer 8

bubbling the gas through limewater and if it turns cloudy, carbon dioxide is present

Question 9

are common carbonates and hydroxides soluble or insoluble in water?

Answer 9

insoluble

Question 10

what does dilute mean?

Answer 10

an acid with a small number of acid molecules compared to the volume of water