43
A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?
- A. S dissolves in the solution
- B. crystals of R are precipitated
- C. there is no observable change
- D. R and S react to generate heat
44
The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?
- A. Mg+
- B. K+
- C. CO22-
- D. HCO3
45
Which of the following statements is NOT correct?
- A. The average kinetic energy of a gas is directly proportional to its temperature
- B. At constant temperature, the volume of a gas increases as the pressure increases
- C. The pressure of a gas is directly proportional to the density.
- D. The temperature of a gas is directly proportional to its volume