Pure
Substances
- A pure substance and a mixture
could be confused because they are both homogeneous in appearance.
- They are both the same because
they are made of the same particles. Many factors can be tested but their
results will always behave the same no matter where they come from.
- b) Jewelry is not pure gold because
pure gold is a very soft. The necklaces the can be bought at a store are a
mixture of gold and something else to make it stronger (an alloy). Karats
are a measure of the purity of the gold; 24 karats is the highest purity
for jewelry.
- If the shirt has a label with
100% cotton then this is not a pure substance because there cotton is a
plant, not an atom or molecule. A shirt is made up of a variety of things
including the dye in the shirt which also makes it a mixture.
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