Chemistry - June 2011

36 Which compound becomes less soluble in water as the temperature of the solution is increased?

(1) HCl    (3) NaCl
(2) KCl    (4) NH4Cl

38 Given two formulas representing the same compound:

Which statement describes these formulas?

(1) Formulas A and B are both empirical.
(2) Formulas A and B are both molecular.
(3) Formula A is empirical, and formula B is molecular.
(4) Formula A is molecular, and formula B is empirical.

40 In a laboratory where the air temperature is 22C, a steel cylinder at 100.C is submerged in a sample of water at 40.C. In this system, heat flows from
(1) both the air and the water to the cylinder
(2) both the cylinder and the air to the water
(3) the air to the water and from the water to the cylinder
(4) the cylinder to the water and from the water to the air

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