Separating Mixtures

1. PICTURE ANALYSIS

5. Short
Review
Q1. What would you need to separate a
mixture of sand and water?
Q2. When would magnets be useful to
separate things?
Q3. What is the difference between the
processes of evaporation and filtering?

6. Short Review
Q1. What would you need to separate a
mixture of sand and water? You would need
something like a sieve or a strainer.

7. Q2. When would magnets be useful to
separate things? Magnets would be
useful to separate small things made of
metal from other solids or liquids.

8. Q3. What is the difference between the
processes of evaporation and filtering?
The difference is that in evaporation you need to
heat the liquid so that it evaporates from the
mixture and leaves the solid behind, whereas in
filtering, the solid is removed from the mixture
when you pour the mixture through a filter paper
and the solid stays behind in the filter paper.

12. OBJECTIVES
1.Enumerate techniques in separating
mixtures such as decantation, evaporation,
filtering, sieving and using magnet; and
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2.Differentiate homogeneous from
heterogeneous mixtures.
3.Discuss evaporation, filtering, sieving and
magnification.

13. Lets do this!
Complete the flow diagram by filling in the blank boxes marked A
and B in the table below.

14. ANSWER:
ASK A QUESTION OR AIM
WHAT IS MEASURED OR RESULT

15. What’s in the bucket?
A group of high school students were
playing on the beach and found a
small bucket of some interesting
materials. The students found that
the bucket contained a lot of sand but
also some small nails, some large
broken shells, and some white
crystals.
The students wanted to find out what
the white crystal are. Their problem
was to separate the mixture of
materials in the bucket down to the
white crystals. They started by picking
out the large shells by hand. The
students drew the following
flowchart to help them work out
what to do next.

16. Q1. What piece of equipment did the
students need to do STEP 1?
Q2. What two things did the students
have to do in STEP 2?
Q3. How would the students be able to
separate the white crystals from the
water?

17. Q1. What piece of equipment did the
students need to do STEP 1? The students
needed a magnet to separate out the nails
from the rest.
Q2. What two things did the students
have to do in STEP 2? The students
would need to add water and then filter
the sand out.

18. Q3. How would the students be able to
separate the white crystals from the
water? The students would need to
heat the solution of white crystals to
drive off the water and then they would
be left with the white crystals.

20. Q1. What equipment did the students need for
STEP 3?
Q2. What three processes of separation did the
students use in their experiment to separate out
all the different materials in the bucket?
Q3. What if the students mixed up the steps and
did STEP 2 instead of STEP 1 to begin their
experiment? How could they fix up their
mistake?
Lets go deeper in our study

21. Q1. What equipment did the students need for
STEP 3? They would need a Bunsen or
something to heat up the mixture, or they
would need an evaporating basin or dish to
heat.
Q2. What three processes of separation did the
students use in their experiment to separate out
all the different materials in the bucket? They
used the processes of filtration, evaporation,
and the use of a magnet.

22. Q3. What if the students mixed up the steps and
did STEP 2 instead of STEP 1 to begin their
experiment? How could they fix up their
mistake? If the students added the water in
STEP 1, then they could still filter out the
sand and the nails but the nails would
probably tear the filter paper. They would still
have to use the magnet to get rid of the nails.

23. Let us summarize your learning.
Q1. Has this lesson helped you to better
understand the use of flow diagrams? If
so, how?
Q2. Has this lesson helped you to recall a
number of different separation
techniques? If so, how?

24. Great Job!