Phase Change Worksheet Name:____________________
Date:__________Period:_____
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
(1)_______________ volume and (2)_____________ shape. With each passing minute, (3)_____________ is added
to the substance. This causes the molecules of the substance to (4)____________ more rapidly which we detect by a
(5)________________ rise in the substance. At point B, the temperature of the substance is (6)______°C. The solid
begins to (7)__________. At point C, the substance is completely (8)____________ or in a (9)___________ state.
Material in this phase has (10)_______________ volume and (11)_____________ shape. The energy put to the
substance between minutes 5 and 9 was used to convert the substance from a (12)___________ to a
(13)___________.
Between 9 and 13 minutes, the added energy increases the (14)______________ of the substance. During the time
from point D to point E, the liquid is (15)___________. By point E, the substance is completely in the
(16)__________ phase. Material in this phase has (17)_____________ volume and (18)___________ shape. The
energy put to the substance between minutes 13 and 18 converted the substance from a (19)___________ to a
(20)___________ state.. Beyond point E, the substance is still in the (21)______________ phase, but the molecules
are moving (22)_______________ as indicated by the increasing temperature.
23. Which of these three substances was likely used in this phase change experiment?
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