Question

Solubility of most substances increases with an increase in temperature.
against
EXERCISES
A. Choose the most appropriate answer.
read
Enly
erties
1. Most of the substances we see around us are
a. pure elements b. pure compounds. c. impure elements.
d. mixtures.
2. A solution of salt in water is a
a. compound
b. homogeneous mixture.
c. heterogeneous mixture.
d. element.
3. The property used in separating a mixture of two solids by winnowing is
a difference in colour
b. difference in size.
c. difference in weight.
d. attraction by magnet.
4. The process of settling down of particles of a solid in a liquid is
a decantation b. sublimation
c. sedimentation. d. filtration
5. Which method is used to obtain a pure liquid from a solution?
a. distillation b. condensation c. filtration
d. loading
6. The temperature of a saturated solution of sugar in water is raised by 10 °C. Which of these
statements is now true?
a. It will continue to be saturated.
b. It will become unsaturated.
c. Whether it remains saturated or becomes unsaturated depends on the amount of water taken.
d. It will continue to be saturated, but if the temperature is increased beyond 10 °C it
will become unsaturated.
7. Which of the following can dissolve in water?
b. only solids and liquids
d. only liquids
c., solids, liquids and gases
ole-
a. only solids​

Answer 1

Explanation:

1- mixture

2-heterogeneous mixture

3-diifference in size

4-decantation

5-filtration

7-only solids

Answer 2

Answer:

becauce the inter molecular force become week by temperature,as atoms vibrat and bond become week