2022 Chemistry Mistakes

Question 1

Give one observation that a base in excess

Answer 1

Base will no longer disappear into solution and dissolve

Question 2

Why is excess base used rather than excess acids

Answer 2

Base removal is much easier as it can be filtered off

Question 3

Give a observation to show a metal is more reactive than another

Answer 3

More vigorous bubbling

Question 4

What type of particles can pass through the mesh of a electrolysis

Answer 4

Ions

Question 5

What alkaline solution is produced during the aqueous electrolysis sodium chloride. Why?

Answer 5

Sodium hydroxide - at the cathode hydrogen ions are reduced and hydrogen is released, at the anode chlorine ions are oxidised and are discharged as chlorine atoms leaving sodium ions from compound and hydroxide ions present

Question 6

If something is solid why is it’s thermal conductivity zero

Answer 6

No ions free to move

Question 7

Why does adding more barium hydroxide enable thermal conductivity of mixture to increase

Answer 7

Mixture now contains barium and hydroxide ions that are free to move