Chemistry 101

Final Examination Practice Questions

[8] 1.a) Supply the missing name or formula:

cadmium phosphide _____________________

mercury (I) chlorate _____________________

_____________________ TlCH₃COO

_____________________ HBrO(aq)

b) Write a balanced molecular equation and a net ionic equation where

appropriate for each of the following reactions. If no reaction occurs, write

“no reaction”. Show all phases for the reactants and products.

i) Solid boron oxide is added to water.

ii) Solid calcium oxide is added to a concentrated aqueous

solution of perchloric acid.

iii) A solid sample of mercury (II) oxide is strongly heated under vacuum.

[5] 2. Answer the following five questions by filling in each blank with

the appropriate answer:

i) Which atom has the greater Z_eff, Si or S? __________

ii) Which ion has the largest radius, K⁺, Cl^-, Sc³⁺ or

S^2-?_____________________.

iii) Exothermic reactions have _____________ (larger/smaller) K_p when temperature
is increased?

iv) Lewis bases donate ________________? (2 words)..

v) Arrange the following atoms in order of decreasing atomic radius:

In, Te, Sn, Kr ___________________________________.

[3] 3. a) Arrange the following binary compounds in order of increasing acid strength:

HI, PH₃, H₂Se, CH₄

b) In one clear sentence, explain why HF is a weak acid whereas HCl is a strong acid.

[6] 4. Liquid pentaboron nonahydride (B₅H₉) reacts with water to form solid boric

acid (H₃BO₃) and molecular hydrogen gas.

a) Write a balanced equation for the reaction.

b) Classify the reaction as either redox or metathesis.

c) If 3.00 g of liquid water were added to 2.50 g of B₅H₉ (l), how many litres of molecular hydrogen gas, measured at 750.0 mmHg and 20.0^oC, would be produced? Assume the reaction goes 100 % to completion.

[14] 5. Explain the following observations in one or two sentences:

a) aluminum trichloride (AlCl₃) reacts vigorously with ammonia

b) carbon tetrachloride is completely non-polar

c) titanium tetrachloride is a liquid at room temperature, even though the electronegativity difference between the elements is large

d) dinitrogen has a lower boiling point than carbon monoxide

e) pure water is a poor conductor of electricity

f) oil and water do not mix

g) graphite is a good lubricant whereas diamond is not

[6] 6. Write down the electronic configuration for each of the following ions

and classify each as a noble gas ion, a pseudonoble gas ion or an inert pair

ion.

i) Cs^-

ii) Sn²⁺

iv) Tl³⁺

7. Determine if aqueous solutions of the following ionic compounds are acidic , basic or neutral. Include the equations for any hydrolysis reactions that take place.

i) AlCl₃

ii) NH₄CN