Some chemistry questions please help...

whoever answers the most of them or all if you can :) will get the 10 points. the ! are really arrows that dont show up right on this thankss for the help

Which of the following metals or nonmetals
are expected to displace Fe or Br (respec-
tively) from FeBr2?
1. I should displace Br.
2. Au should displace Fe.
3. Cl should displace Br.
4. Cu should displace Fe.

Which response includes all of the following
Z1) LiO2 + CO2 ! Li2CO3
Z2) Cl2 + 2NaBr ! Br2 + 2NaCl
Z3) HNO3 + KOH ! KNO3 + H2O
Z4) SO3 + H2O ! H2SO4
that are combination reactions, and none that
are not combination reactions?
1. Z1 and Z2 only
2. Z1 and Z4 only
3. Z1, Z3 and Z4 only
4. Z1, Z2 and Z4 only
5. Another reaction or another combination

Select one metal which will displace Sn from
a compound and form metallic tin (Sn).
1. Hg
2. Cu
3. Ag
4. Cr

What is one of the possible products of a
solution if CaI2 is mixed with a solution of
NaNO3?
1. CaNa
2. Ca(NO3)2
3. CaNO3

The observed product from the reaction of
FeCl2 and K2CO3 is
1. There is no reaction.
2. KCl electrolyte.
3. CO2 gas.
4. FeCO3 precipitate.
5. Cl2 gas.


Identify the type of the reaction
CaO + H2O ! Ca(OH)2
1. combustion
2. combination
3. displacement
4. dissociation
5. oxidation-reduction
6. acid/base neutralization


Which reaction is both a redox and a decom-
position reaction?
1. Zn + 2HCl ! ZnCl2 + H2
2. NH3 + HCl ! NH4Cl
3. Br2 + 2 I−
! I2 + 2Br−
4. 2KClO3 ! 2KCl + 3O2
5. BaCO3 ! BaO + CO2

1. this requires an activity series. any metal above Fe on this chart will replace Fe.
for gases, F2 > Cl2 > Br2 > I2. the lower the gas, the least likely it will replace the gas above it.
C. Cl will replace Br

2. 1 and 4, synthesis reactions

3. 4, Cr

4. 3, Ca(NO3)2

5. FeCO3

6. synthesis/combination

7. 3 is a redox rxn but it most likely is a single replacement
4 is redox and decomp