Natural Sciences and Technology Grade 6-A - Thunderbolt Kids

DID YOU KNOW?
Water purification
tablets can be used in
emergencies such as a
flood or earthquake
when you do not have
access to clean water.
The tablets remove
microscopic impurities
and chemicals that
could harm you.
How can water be cleaned?
Imagine you are in aplace without clean water. The only water
around is amuddy stream. How can the dirty water be made clean
enough to drink? When thinking about how to purify water, we
need to consider what it is that we need to do to separate the
contaminating particles from the water. The muddy water is
actually amixture of sand and water, and possibly other
contaminants.
QUESTIONS
1. Do you remember in the beginning of the term we looked
at dierent ways to separate out mixtures? What are
some of these ways?
2. Which methods do you think would be useful to separate
the large impurities from the dirty water?
3. Which methods would be useful to remove the soluble
impurities from the dirty water?
Let's investigate some dierent ways to clean water at home or at
school.
190 Matter and Materials