2.2-2.4 Revision Exercise - Fill in the blanks and MCQ

In a salt solution, the salt seems to disappear! In fact, the salt is broken into very small pieces. We say that the salt is (a)   in water.

As water can dissolve many different substances, it is often called a (a)   solvent.

Sand is (a)   in water.

The rate of dissolving decreases when the temperature of the solvent is ____________.

• high.

• low.

The rate of dissolving increases when the surface area of the solute is ____________.

• larger

• smaller

The process in which large solid particles in a liquid settle at the bottom of a container is called (a)   .

The solid substance trapped by the filter after filtration is called (a)   .

Filtered water is not safe to drink because it still contains (a)   .

Name THREE methods that are commonly used to kill microorganisms in water.

(a)  

To remove small insoluble impurities, the method of purifying water called (a)   can be used