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Questions and Answers
Which substance will condense first when cooled to low temperatures?
Which substance will condense first when cooled to low temperatures?
- Substance X
- Substance Y (correct)
- Substance W
- Substance Z
What is the boiling point of substance X?
What is the boiling point of substance X?
- -161.5 °C
- 0 °C
- 42.1 °C (correct)
- -187.7 °C
How many kilocalories of heat are needed to melt 20 grams of ice at 0°C to water at 40°C?
How many kilocalories of heat are needed to melt 20 grams of ice at 0°C to water at 40°C?
- 2,400
- 1.8
- 1,800
- 2.4 (correct)
What is the melting point of substance W?
What is the melting point of substance W?
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In terms of boiling points, which substance has the highest boiling point?
In terms of boiling points, which substance has the highest boiling point?
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Study Notes
Boiling and Melting Points of Gases
- W has a melting point of -182.5°C and a boiling point of -161.5°C
- X has a melting point of -187.7°C and a boiling point of 42.1°C
- Y has a melting point of -218.8°C and a boiling point of -183°C
- Z has a melting point of -183.5°C and a boiling point of -88.5°C
Melting Ice
- 20 grams of ice at 0°C requires 2.4 kilocalories of heat to melt to water at 40°C
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