– Units 3-4 Review Honors Chemistry Unit 3

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Honors Chemistry – Units 3-4 Review
Answer the following questions on a separate sheet of paper.
Unit 3
1.
a)
b)
Identify the place(s) in the graph where energy stored thermally is
constant.
Identify the place(s) the graph where energy stored in the arrangement
(phase) is constant.
2.
If a solid object is cooling down, what happens to the energy stored thermally
in the object? What happens to the energy stored thermally in the object’s
surroundings? What does this do to the temperature of the object’s
surroundings?
3.
If a liquid is boiling, what happens to the energy stored thermally? What
happens to the energy stored thermally in the boiling liquid’s surroundings?
What does this do to the temperature of the boiling liquid’s surroundings?
4.
A sample of ethanol is boiling. What is inside the bubbles that form?
Use a particle diagram to aid your explanation.
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5.
Sketch a temperature-time graph for the following situation: A sample
of water vapor condenses and then cools to room temperature (23oC).
For each of the situations described in Questions 6 and 7, use energy bar charts and
flow diagrams (LOL’s) to represent the ways that energy is stored in the system and
flows into or out of the system.
6.
A sample of paraffin melts at 56oC and then its temperature rises to 100oC.
7.
A fork is placed in the freezer.
Use the following constants and equations to solve questions 8 and 9. Be sure to
show all your work, including units, and express your answers with appropriate
significant figures.
334 J/g
2260 J/g
2.10 J/g˚C
4.18 J/g˚C
Heat of fusion (Hf) (melting or freezing)
Heat of vaporization (Hv) (evaporating or condensing)
Heat capacity (C) of solid water
Heat capacity (C) of liquid water
Q = CmT
Q = Hm
8.
A pot originally contains 250 mL of water. After several minutes of boiling,
200. kJ of energy has been transferred to the water. What volume of water
has been vaporized? Remember that the density of water is 1.00 g/mL
9.
A 60.0 g sample of liquid water at 0.0˚C ends up as ice at –15.0˚C. How
much energy is involved in this change?
10.
What effect will the energy change you calculated above have on the
temperature of the surroundings? Explain.
Unit 4
11.
Define and give at least two examples of each of the following terms: matter,
substance, mixture, element, compound, metal, metalloid, nonmetal,
molecular compound, ionic compound, heterogeneous mixture, homogeneous
mixture.
12.
Create a flow chart or concept map/web diagram that includes all of the
terms introduced in Question 11.
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13.
How does distillation work to separate substances in a mixture? How does
filtration work?
14.
Identify the following as physical or chemical properties: density,
flammability, boiling point, opacity, toxicity, odor
15.
Identify the following as physical or chemical changes: crumpling paper,
freezing water, burning wood, silver tarnishing, burning steel wool,
dissolving sugar in iced tea
16.
List several physical properties and at least three chemical properties of
iron.
Use the diagram below to answer Questions 17-19.
17.
What model of the atom is represented above? Explain why this model
was a necessary replacement for Dalton’s model, the “featureless sphere.”
18.
What part(s) of the model above are mobile? How does this explain the
existence of charge?
19.
Use the model above to explain how something can be neutral but can be
attracted to both positively and negatively charged objects.
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20.
Describe the contents of each cell.
21.
Below left is a 2-D array that represents an ionic lattice. At right is a 2-D
array that represents a molecular solid. In what ways are they similar? In
what ways are they different?
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U3-4 review 2015