Physical properties: Melting Points&Boiling Points
Name ___________________ Date ____________ Class ____________
Use the table on page 597 to find the melting points and boiling points of the
substances.
Substance Melting
point
Boiling
C
o
Point oC
State at
-5 oC
State at
State at
50 oC
150 oC
Water
Ammonia
Sodium
chloride
Using Thermometers To Display The States Of Different Substances
Note: all information in oC but the thermometers have different scales
JS
Steps:
1. Put the name of the substance under the thermometer.
2. Mark on the melting point and boiling point, remember the thermometer
can have any scale that works for your data.
3. Mark on where that substance would be a solid (below the melting
point), liquid (between the melting point and boiling point) and a gas
(above the boiling point.)
4. Put the required temperatures on the thermometers.
5. Look on the thermometer to see what state the substance would be at
the required temperatures.
Physical Properties Homework
Name ___________________ Date ____________ Class ____________
1. (a) The melting point for oxygen is
-218.4 oC and its boiling point is -183
o
C. Add this data to the
thermometer and mark in the
temperatures oxygen is a solid, liquid
and gas. There is one mark for
showing each highlighted item.
(5 marks)
(b) Use this information to complete
the table.
(3 marks)
Temperature /
o
state
C
-250
-200
-100
0
+100
+200
Density Question
2. You will need to use the information on
table 2, page 597 to answer this question.
JS
a) Which substance is the least dense and what state is it in at room
temperature?
Substance __________________ state at room temperature ________________
(2 marks)
b) A student carries out an experiment to find the density of one of the
substances in the table. They find it has a mass of 7.8g and a volume of
3 cm3.
Calculate the density of the item. Show your working and give the
(i)
units.
(3 marks)
The density the student finds does not exactly match any of the values in
the table, but their teacher assures them they have been using a substance
listed on the table.
(ii) Use the table to name the substance. ________________________
(1
mark)
(iii) Explain why the value they obtain is slightly different from that listed
on the table.
__________________________________________________________________________
(1 mark)
Physical changes: Melting Point
Name ___________________ Date ____________ Class ____________
JS
Wax melting is a physical change – a change that is easy to reverse because
when liquid wax cools it turns back to solid wax.
Method:
1. Collect a boiling tube with the wax and the thermometer.
2. Place the boiling tube in the water bath. This is the start of your
experiment.
3. Complete the table.
4. When the solid has completely melted – stop recording your results.
Time
Temperature
(minutes)
(°C)
Observations
1 minute
2 minutes
3 minutes
4 minutes
5 minutes
6 minutes
7 minutes
8 minutes
9 minutes
10 minutes
(2 marks)
Draw and label a diagram of the experimental set up.
(2 marks)
Draw a line graph of time vs temperature (use graph paper provided)
JS
Remember to include: heading, labels for both axis, units for both axis,
an accurate and appropriate scale for both axis, use a SHARP pencil for
all lines and a ruler. Use DOTS to show where the points are and connect
the dots with straight lines using a RULER. Please work neatly.
(6 marks)
JS