Comprehensive Review: Change of State and Transfer of Heat

A comprehensive review covering heat of fusion, heat of vaporization, and the three methods of heat transfer: conduction, convection, and radiation.

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QUESTION OF

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Views #: 118

Questions #: 13

Time: 25 minutes

Pass Score: 80.0%

Style

Step

List

Mode

Exam

Practice

Freezing 5 Grams of Water

2 pts

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How many calories of heat must be removed from 5 grams of water at 0°C to change it into ice at 0°C?

Answer = (1)

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Heating and Vaporizing 5 Grams of Water

3 pts

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How much heat is needed to change 5 grams of water at 90°C to steam at 100°C?

Answer = (1)

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Explanation

What Happens at the Molecular Level When Ice Melts?

2 pts

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When heat is added to ice to change it into water, what happens at the molecular level?

The molecules move faster while staying in fixed positions

The molecules lose kinetic energy

The molecules stop vibrating entirely

The energy breaks the bonds holding molecules in fixed positions

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Why Amorphous Solids Have No Fixed Melting Point

2 pts

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Why does an amorphous solid not have a definite melting point or a true heat of fusion?

It has no molecular bonds at all

Its molecular bonds vary in strength and break at different temperatures

Its molecules are identical to a liquid's

It absorbs no heat when warmed

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Explanation

Why Vaporization Takes So Much More Heat Than Fusion

2 pts

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Why is the heat of vaporization of water so much greater than its heat of fusion?

Water vapor has a higher specific heat than ice

Fusion requires more energy per molecule

Vaporization happens at a lower temperature

Vaporization requires completely breaking molecules free from one another, not just loosening their bonds

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Explanation

Select the Three Methods of Heat Transfer

2 pts

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Select every method by which heat can be transferred from one place to another.

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Explanation

Match the Heat Transfer Method to an Example

3 pts

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To complete the line match

Click on an item in the first group
Click on an item in the second group
To delete a match, double click on a line

Method

Radiation

Conduction

Convection

Example

A metal spoon left in hot soup becomes hot to the touch

Standing near a fire you feel warmth even without touching it

Warm air near a heater rises and circulates around a room

Match each method of heat transfer on the left with a real-world example on the right.

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Explanation

Which Metal Conducts Heat Best?

1 pts

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Which is the best conductor of heat: iron, silver, or copper?

Iron

Silver

Copper

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Explanation

Heat Flow Through an Iron Rod

3 pts

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An iron rod (k = 0.16 cal/cm·s·C°) has a cross-sectional area of 1 square centimeter and is 100 cm long. One end is held in a fire at 700°C and the other in water at 50°C. Using \(H = \frac{k \cdot t \cdot A \cdot \Delta T}{d}\), how much heat flows through the rod in 1 minute?

Answer = (1)

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Is Gold Crystalline or Amorphous?

1 pts

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Gold melts at a sharply defined 1063°C. Is gold a crystalline or an amorphous solid?

Amorphous

Crystalline

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Explanation

Why White Lines Feel Cooler Than Asphalt

2 pts

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White lines are often painted across asphalt streets in beach areas. Why are these lines cooler to walk on than the surrounding asphalt?

They absorb less thermal radiation from the sun than the dark asphalt

They have a lower specific heat than asphalt

They conduct heat away from your feet faster

They reflect sound instead of heat

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Explanation

Why Iron Feels Cooler Than Wood at the Same Temperature

2 pts

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If a wooden bench and an iron post are both at -5°C on a cold morning, why does the iron post feel cooler to the touch?

Iron radiates more heat into the air

Iron conducts heat away from your hand much faster than wood does

Wood has a higher thermal conductivity than iron

Iron has a lower temperature than the wood

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Sort True or False: Fusion vs. Vaporization

3 pts

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Amorphous solids have a definite heat of fusion

The heat of fusion of water is 80 calories per gram

The heat of vaporization of water is 80 calories per gram

Vaporizing water requires more heat per gram than melting ice

True

False

Sort each statement as True or False

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Explanation

Year 11 Year 12

Freezing 5 Grams of Water

Correct Answer

Explanation

Heating and Vaporizing 5 Grams of Water

Correct Answer

Explanation

What Happens at the Molecular Level When Ice Melts?

Correct Answer

Explanation

Why Amorphous Solids Have No Fixed Melting Point

Correct Answer

Explanation

Why Vaporization Takes So Much More Heat Than Fusion

Correct Answer

Explanation

Select the Three Methods of Heat Transfer

Correct Answer

Explanation

Match the Heat Transfer Method to an Example

Method

Example

Correct Answer

Explanation

Which Metal Conducts Heat Best?

Correct Answer

Explanation

Heat Flow Through an Iron Rod

Correct Answer

Explanation

Is Gold Crystalline or Amorphous?

Correct Answer

Explanation

Why White Lines Feel Cooler Than Asphalt

Correct Answer

Explanation

Why Iron Feels Cooler Than Wood at the Same Temperature

Correct Answer

Explanation

Sort True or False: Fusion vs. Vaporization

Sort each statement as True or False

Sort each statement as True or False

Correct Answer

Explanation

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