When a solution of sodium lactate,
ch3ch(oh)coona, is mixed with an aqueous copper(ii)
solution, it is possible toobtain a solid salt of copper(ii)
lactate as a blue-green
hydrate,(ch3ch(oh)coo)2c xh2o.
elemental analysis of the solid tells us that the solid is 22.9%
cuand 26.0% c by mass. what is the value for x in the formulafor
the hydrate?

Use the following answers for questions 1 - 2. (1984 - #8 & 9)

(A) A network solid with covalent bonding

(B) A molecular solid with zero dipole moment

(C) A molecular solid with hydrogen bonding

(D) An ionic solid

(E) A metallic solid

1. Solid ethyl alcohol, C2H5OH (C)

2. Silicon dioxide, SiO2 (A)

Use these answers for questions 3-6 (1989 #11 – 14)

(A) hydrogen bonding (B) hybridization (C) ionic bonding

(D) resonance (E) van der Waals forces (London dispersion forces)

3. Is used to explain why iodine molecules are held together in the solid state (E)

4. Is used to explain why the boiling point of HF is greater than the boiling point of HBr (A)

5. Is used to explain the fact that the four bonds in methane are equivalent (B)

6. Is used to explain the fact that the carbon-to-carbon bonds in benzene, C6H6, are identical (D)

Use the following diagram for questions 7-8

(1989 - #49&51)

7. The normal boiling point of the substance

represented by the phase diagram above is

(A) -15 °C (B) -10 °C

(C) 140 °C (D) greater than 140 °C

(E) not determinable from the diagram

8. For the substance represented in the diagram,

which of the phases is most dense and which is

least dense at - 15 °C.

Most Dense Least Dense

(A) Solid Gas

(B) Solid Liquid

(C) Liquid Solid

(D) Liquid Gas

(E) The diagram gives no information