Name: __________________________________ Date: ___________________ P___R___S___
Lab Partner’s Name(s): ________________________________________________________
Honors Chemistry / CPA Chemistry
Beaker
Materials:
 Thermometer – 0 to 100C
 Beaker – 250 mL
 Hot plate
 Ice
 Tap water
 Graph Paper
 25 ml graduated cylinder
Thermometer
Hot Plate
Procedure:
 Prepare a data table like the example below that has Time on one side and Temperature
on the other side until the time is 5 minutes:
Time Temperature
(sec)
(C)
0
30
60
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Fill the beaker with ice, then add a small amount of water (about 25 mL).
Record the temperature of the ice water in the table. This is the temperature at “0
minutes.”
Place the beaker on the hot plate with the hot plate TURNED OFF.
Measure the temperature every 30 seconds until the water begins to boil.
Do not let go of the thermometer.
Do not let the thermometer touch the beaker sides or bottom.
Turn on the hot plate to about half-way.
Collect temperature measurements every 0.5 minutes (30 seconds).
Also watch carefully and note the time when all the ice has melted and also when the water
begins to boil by making a mark in your data table “when water begins to boil.”
Stir the beaker constantly but gently.
When the ice has completely melted, turn the hot plate to HIGH.
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Continue to collect temperature measurements every 0.5 minutes until the water has been
boiling for about 5 minutes or you have collected 8 (eight) temperature measurements that
are within 0.5 degrees of each other.
Do not let the beaker go dry. Stop the experiment, turn off the hot plate and notify the
teacher if your beaker is close to going dry.
Turn off the hot plate and pour the water down the sink.
Graph your data, x –axis as time and y-axis as temp. Use the whole piece of graph paper.
Questions:
1. Label your graph to indicate the different phases of water.
2. What is happening to the water during the “flat” areas in the graph?
3. What is happening to the water during the slanted areas in the graph?
4. In what areas of the graph is there more than one phase of water present?
5. What is happening to the heat from the hot plate when the water is changing from ice (solid) to
water (liquid)?
6. What is happening to the heat from the hot plate when the water is a water (liquid) only?
7. Why do you think that the slope of the graph is not a straight line?
8. If the water used is a double amount, what do you think the graph looks like? Explain your
reason.