exam questions

Question 1

why does silver nitrate need to be acidified in the test for halide ions

Answer 1

to remove carbonate ions which could give a false positive

Question 2

what is the conjugate acid base pairs in this reaction
CH3COOH + HCOOH -> CH3COOH2+ + HCOO-

Answer 2

CH3COOH + HCOOH -> CH3COOH2+ + HCOO-
base (gains H+) acid (loses H+) conjugate acid conjugate base

Question 3

Give a reason why the student added a small pinch of calcium carbonate to the acid
before starting the reaction.

Answer 3

to stop CO2 from dissolving in solution

Question 4

what structure and bonding does silicon form

Answer 4

giant covalent
contains covalent bonds
require a lot of energy to overcome

Question 5

what structure and bonding does chlorine form

Answer 5

simple molecular
contains weak London forces
require little energy to overcome

Question 6

Some alcohols react with concentrated phosphoric acid to form alkenes.
What is the type of this reaction?

Answer 6

elimination