3.3 Physical and Chemical Chang
1.
List the two types of changes that can affect matter.
Type ofChange
Description
a. Involves only changes to the appearancs
ofa
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b. Involves the formation or breaking of bonds between atoms.
2.
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Give two specific examples for both chemical and physical changes.
Chemical Change Examples
Physical Change Examples
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Endothermic or Exothermic:
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I)etermine whether the following involves a chemical change, physical change, or both,
when cooking a simple curry.
Type of Change(s)
Kitchen Process
a. Slicing onion, crushing garlic.
b. Getting onion vapour in eyes (causes stinging).
e. Tasting the curry to check the flavour.
Science 9
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Chemistryo Assignment
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5. Each of the following involves both chemical
and physical changes. IdentiS both in
each of the examples.
a.
b.
Flattening a flower in a book and leaving it
there for a few weeks.
Leaving a banana to become overripe and then
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c. Slicing a loaf of bread and leaving it until
mould begins to
d.
Making
a hard-boiled egg
for breakfast.
Explain why liquid water changing into
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7. A white crystal is ground up into a fine powder and then placed into a beaker full of
water. The mixture is stirred until the white powder disappears. After two weeks, the
water is gone and a number of white crystals are crusted onto the inside of the beaker.
Make a brief list of the physical changes that occurred.
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Two cleai and colourless solutions are drixed together and stirred. Almost immediately,
the mixfure becomes cloudy white. After a while, a white powder settles out on the
bottom of the beaker. Explain whether the process of forming a white powder was likely
to be a physical change or a chemical change.
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Science 9
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Chemistryo Assignment
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Page 2
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