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Grade 12 Chemistry Review

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The oxidation number of N in (NH4)3PO4 (ammonium phosphate) is:

-3

5

The oxidation number of Fe in K3Fe(CN)6 is:

+3

10

In the following chemical reaction the oxidizing agent is 1. 5H2O2 + 2MnO4 – + 6H+ → 2Mn2+ + 8H2O + 5O2

O2

H2O2

Mn2+

MnO4 –

15

Identify the reducing agent in the following chemical reaction. Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2

Cd

25

Which one of the following is a redox reaction? a) 2KBr(aq) + Pb(NO3 )2 (aq) → 2KNO3 (aq) + PbBr2 (s) b) 2Al(s) + 3H2SO4 (aq) → Al2 (SO4 )3 (aq) + 3H2 (g) c) CaBr2 (aq) + H2SO4 (aq) → CaSO4 (s) + 2HBr(g) d) H+ (aq) + OH– (aq) → H2O(l)

b) 2Al(s) + 3H2SO4 (aq) → Al2 (SO4 )3 (aq) + 3H2 (g)

20

How many carbons are there in methyl butanoate

5

Which of the following would you expect to have the highest boiling point? ethanol, ethyl ethanoate, ethanoic acid, ethane, ethene, ethyne, ethanal or chloroethane?

ethanoic acid - has the most hydrogen bonding therefore it takes more ENERGY to break those intermolecular bonds. Therefore it should have highest boiling point

10

What is the name of this compound?

2-bromo-1,3-dimethylbenzene

15

Is cyclopentanol a primary secondary or tertiary alcohol?

secondary alcohol ( 2 carbons attached to the adjacent carbon of alcohol)

20

What is the major product when 2-methylprop-1-ene is treated with HBr at room temperature?

2-bromo-2-methylpropane

25

For the reaction: Ag+ (aq) + Cl-(aq) <--> AgCl(s) ΔH = -127kJ/mol In which direction does the equilibrium shift as a result of adding NaCl?

to the right

5

For the reaction: 2HI (g) <--> H2 (g) + I2 (g). If the Ksp is 0.020 and the Qsp is 0.34, the reaction will proceed which direction?:

Proceed to the left

10

Given the equilibrium: AgBr(s) <--> Ag+ (aq) + Br-(aq) Ksp = 3.3 x 10-13 If [Br-(aq)] = 0.50 mol/L, what is [Ag+ (aq)]?

6.6 x 10^-13

20

Which of the following is NOT a strong base?

Li2O

Be(OH)2

NaOH

CaO

15

The air pollutant NO is produced in automobile engines from the high temperature reaction: N2 (g) + O2 (g) D 2NO(g) Keq = 1.7 x 10-3 at 2300K. If the initial concentration of N2 (g) and O2 (g) at 2300K are both 1.40M, what is the concent

1.372 mol/L

25

When an electron falls to a lower energy level it:

Emits light

5