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 _____________ in water.

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

Sand is ____________ 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 ____________.

The solid substance trapped by the filter after filtration is called ______________.

Filtered water is not safe to drink because it still contains ____________________.

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

To remove small insoluble impurities, the method of purifying water called ____________ can be used