This is regarding an earlier post...

1. The powder can be any ammonium salt. I'm going to use ammonium chloride.

a) ammonium chloride. NH4Cl = NH3 + HCl

b) the red one. ammonia gas diffuses faster than HCl due to it's lower Mr.

c) so the gases can dissolve on the paper.

2.

a)
A : Ag2CO3 (silver carbonate)
B: Ca(OH)2 (calcium hydroxide/ limewater)
C: AgCl (silver chloride)
D: CaCO3 (calcium carbonate)

b) E's pH would be higher. F's would be lower.

c) Add acid to each powder. if effervescence is observed, it's calcium carbonate. if not it's silver chloride.


3. Despite mercury having delocalised electrons allowing it to conduct electricity like any other metal, mercury tends to cling on to it's electrons more tightly, now wanting to contribute then to the sea of electrons. thus, it's metallic structure, although there, is not as strong as other metal's. thus, it has a low boiling point.

a) Rubidium.

4. a) atoms of the same element with different number of neutrons.

b) allotrope is the same element in different forms eg. diamond and graphite

c) The average weight of all the atoms of that particular element found in nature.

d) pH is the measure of the concentration of H+ ions in a solution.

5. ammonia does act as a base, dissolving in water to form OH- ions. however, it does not act as a acid, as in this case it is the proton acceptor.

so yeah, these are the answers. some might be wrong though. have fun...

Till next post...