# A.2 Heat Curves Phase diagram Worksheet Key ```[Type text]
HEATING CURVES QUESTIONS
PART A – HEATING CURVES. Use the heating curve to the right to answer the following questions:
1. What is the melting point of the substance?
B/ 5 C
2. What is the boiling point of the substance?
D/ 15 C .
3. Which letter represents heating of the solid?
A .
4. Which letter represents heating of the gas?
E.
5. Which letter represents melting of the solid?
B.
6. Which letter represents boiling of the liquid?
D .
7. At points b and d why doesn’t the temperature
change even though heat energy is added?
The Substance must absorb enough heat/ kinetic energy
to Escape the intermolecular actions/ bonds (i.e.
hydrogen bonds) that Keep them their current phase/
state
Refer to the phase diagram below when answering the
questions on this worksheet
PART C – PHASE DIAGRAMS. Use the phase diagram for
water below to answer the following questions.
8. What is the state of water at 2 atm and 50?
LIQUID
9. What phase change will occur if the temperature is
lowered from 80C to -5C at 1 atm?
FREEZING
10. You have ice at -10C and 1 atm. What could you do in order cause the ice to sublime?
Descrease the pressure to less than 0.060 atm
Predict the physical state of each of these substances at the indicated temperature.
Use the melting point and boiling point data from the table below.
a.
b.
c.
d.
e.
f.
Liquid
Gas
Liquid
Gas
Solid
Solid
NAME
Use Table 2.1 to answer questions below. State refers to the state the substance would be in at room
temperature (24 degrees Celsius)
1. Which substances in the table are in the liquid state at 125&deg;C?
Sulfur, Mercury
2. Which substances are in the gas state at 80 &deg;C?
Neon, Oxygen, Chlorine, Ethanol, Bromine
3. Which substances are a solid at 1000&deg;C?
Copper, gold
Use the table below to answer the questions below.
1. Which colorless substance is a liquid at −30&deg;C?
[Type text]
Ethanol
2. Which colorless substance is a gas at 60&deg;C?
Neon
3. Which substance is a solid at 7&deg;C?
Sulfur
4. As the temperature rises, which solid will melt before mercury boils?
Everything
5. Use the arrangement of particles in solids and gases to explain why solids are not as easy to compress
as gases.
Particles are too close together and can not be pushed/ compressed closer
```