Chemical
and Physical Changes Lab
Purpose : To determine
whether certain changes in matter are chemical or physical, and to describe the
changes in detail using observational skills.
Procedure
:
Change
1 :
- Fill a test tube about
½ full of water, and place it in the test tube rack.
- Add a small scoop of
sodium bicarbonate (baking soda) to the test tube.
- Stopper the tube, and
shake it carefully to dissolve the sodium bicarbonate.
- Add about 2 mL of
acetic acid solution (vinegar).
Write down your observations.
- Discard your solution
into the SOLUTIONS waste container
Change
2 :
- Get about a 2.5 cm
piece of calcium carbonate (chalk).
- Use a mortar and pastel
to crush the chalk, Write down your observations.
- Discard the remains
into the garbage can.
Change 3 :
- Add about 1 mL of
acetic acid to a test tube, and place it in the test tube rack
- Add 1 drop of
phenolphthalein (FEEN-ALL-THAL-EEN).
- Write down your
observations and save this solution for Change 4.
Change
4 :
Add sodium hydroxide 1
drop at a time to your solution from Change 3.
- Once a noticeable
change occurs, write down your observations.
- Discard your solution
into the SOLUTION waste container.
Change
5 :
- Get a test tube and
fill it ¼ full of tap water.
- Add a small scoop of
sucrose (sugar) to the test tube.
- Stopper the test tube
and shake it gently to dissolve the sucrose. Write down your observations.
- Pour the solution down
the drain, and rinse the test tube out.
Change
6 :
- Get a DRY test tube and
add a small scoop of sulfur to it.
- Add a small scoop of
iron filings in with the sulfur.
- Stopper the test tube
and gently shake the test tube, and write down your observations.
- Discard this mixture
into the WASTE SULFUR container.
Materials
:
