Questions

Explanations

11 According to Table F, which substance is most soluble in water?

(1) AgCl                (3) Na₂CO₃

(2) CaCO₃             (4) SrSO₄

12 Given the equation representing a reaction:

H  + H → H₂

Which statement describes the energy change in this reaction?

(1) A bond is broken as energy is absorbed.

(2) A bond is broken as energy is released.

(3) A bond is formed as energy is absorbed.

(4) A bond is formed as energy is released.

13 Which sample of matter is a mixture?

(1) air                  (3) manganese

(2) ammonia       (4) water

14 Paper chromatography can separate the components of a mixture of colored dyes because the components have differences in

(1) decay mode

(2) thermal conductivity

(3) ionization energy

(4) molecular polarity

stationary phase is usually polar and attracts the polar components

15 At standard pressure, the boiling point of an unsaturated NaNO₃(aq) solution increases when

(1) the solution is diluted with water

(2) some of the NaNO₃(aq) solution is removed

(3) the solution is stirred

(4) more NaNO₃(s) is dissolved in the solution