Phase Change Worksheet Name:_________________________
Date:_______________Period:_____
1
The graph was drawn from data collected as a
substance was heated at a constant rate.
Use the graph to answer the following
questions 1-23.
1. – 22. At point A, the beginning of observations, the substance exists in a solid state. Material in
this phase has _______________ volume and _____________ shape. With each passing minute,
_____________ is added to the substance. This causes the molecules of the substance to
____________ more rapidly which we detect by a ________________ rise in the substance. At point
B, the temperature of the substance is ______°C. The solid begins to __________. At point C, the
substance is completely ____________ or in a ___________ state. Material in this phase has
_______________ volume and _____________ shape. The energy put to the substance between
minutes 5 and 9 was used to convert the substance from a ___________ to a ___________.
Between 9 and 13 minutes, the added energy increases the ______________ of the substance. During
the time from point D to point E, the liquid is ___________. By point E, the substance is
completely in the __________ phase. Material in this phase has _____________ volume and
___________ shape. The energy put to the substance between minutes 13 and 18 converted the
substance from a ___________ to a ___________ state.. Beyond point E, the substance is still in the
______________ phase, but the molecules are moving _______________ as indicated by the
increasing temperature.
23. Which of these three substances was likely used in
this phase change experiment?
Substance
Melting point
Boiling point
Bolognium
20 °C
100 °C
Unobtainium
40 °C
140 °C
Foosium
70 °C
140 °C
