EXPERIMENTAL INVESTIGATION 14.2 How do the melting points of various substances differ?
Equipment Graduated cylinder Water Beaker
Boiling tube Thermometer Bunsen burner Tripod stand Wire gauze Retort stand and clamp
Method 1. Measure 150 cm3
Suggested
substances to test Candle wax Butter
Chocolate Cheese Ice
SAFETY • Wear safety goggles.
• Tie back hair.
• Ensure the workspace is clear of flammable materials.
• Make sure equipment has cooled down before touching it.
of water in the graduated cylinder and transfer it to the beaker.
2. Place the substance being tested into the boiling tube and place the thermometer into the substance.
3. Using the retort stand and clamp, place the boiling tube in the beaker of water. 4. Heat the beaker of water over a Bunsen burner on the tripod and wire gauze. 5. Observe the material being tested until all the solid is in the liquid state. 6. Record the temperature at which the solid melted to a liquid.
Thermometer
Boiling tube Beaker
Retort stand and clamp
Substance being tested
Wire gauze
Tripod stand Bunsen burner
)Fig. 14.12 To measure the melting point of various solids
j Go to page 35 of your Experimental Investigations Log to write up this investigation. 142 Elements of Science