itinuous
6 The table below shows the melting points, boiling
points and densities of substances A to D.
ces listed below are:
but are
Substance Melting point/°C Boiling point/°C Density/gcm-3
1 energ
nts:
each
A
1110
2606
9.1
B.
-266
-252
0.07
til they
C
40
94
1.6
M
cium, argon, water, air,
n, sodium chloride, diamond,
ulfuric acid, sulfur, oil,
D
-14
60
0.9
d move
s
and pressure (rtp), which of
elow is:
lotion.
s with
a Which substance is a gas at room temperature?
b Which substance is a liquid at room temperature?
c Which substances are solids at room
temperature?
d Which substance is most likely to be a metal?
e Which substance will be a liquid at -260°C?
f What is the melting point of the least dense non-
metal
g Which substances are gases at 72°C?
ar
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Answer:
Harleigh placed a beaker of water on a hot plate. When bubbles started coming to the top of the water, she made the first sketch. After 5 min, Harleigh made the second sketch. A lab group placed some ice in a beaker and put the beaker on a hot plate. After they turned the hot plate on, they recorded the temperature and made observations about the contents of the beaker. The following graph shows the results.
A change in state that does not change the chemical composition of a substance is a physical change. Which of these conditions has the greatest effect on how quickly a substance changes from one state to another?
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