Physical And Chemical Changes
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Ann Sims Dyett Middle School
555 East 51st Street
Chicago, IL 60615
The student will
1. define the terms; physical change and chemical change.
2. identify the different changes as they relate to matter.
For each group of three students:
1. candle, matches, modeling clay
2. 3 sheets of paper, watch glass
3. hot plate, apron, table salt
4. 2-test tubes, dropper bottle of 0.1M silver nitrate
5. magnesium ribbon (1 cm long), 1M hydrochloric acid
6. construction paper, household bleach
1. Make pictures using bleach on construction paper as a P/A.
2. Place a candle on a small piece of modeling clay, so that it is well
supported. Light the candle and allow it to burn while you continue with the
rest of the investigations. Record your observations.
3. Tear one sheet of paper into strips. Wet another sheet of paper. Tear
the third sheet into small pieces and place them on the watch glass. Light the
pieces on the watch glass with a match. Let them burn completely. Record your
observations of the three sheets of paper.
4. Add a small scoop of table salt to a test tube that has been half-filled
with tap water. Place your thumb over the top of the test-tube and shake to
dissolve the salt. Record your observations. Using the dropper, add five (5)
drops of silver nitrate to the salt water solution. Record your observations.
Add a scoop of salt to a half filled test-tube of tap water, heat over the hot
plate for twenty minutes. Record your observations.
5. Place a small piece of magnesium ribbon in a test-tube. Add five (5)
drops of hydrochloric acid to the test-tube. Touch the bottom of the test-tube
with your fingertips. Record your observations.
The two kinds of changes that occur in matter are physical and chemical. In
a physical change, no new substance is formed. However, physical properties
such as size, shape, color or phase may change. In a chemical change, one or
more new substances with new and different properties are formed. Burning and
rusting of iron are examples of chemical changes.