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Questions and Answers
What formula should be used to calculate the amount of energy needed to heat 346 grams of liquid water from 0°C to 182°C, given that the problem indicates no change in temperature and involves a liquid phase?
What formula should be used to calculate the amount of energy needed to heat 346 grams of liquid water from 0°C to 182°C, given that the problem indicates no change in temperature and involves a liquid phase?
- q = m ΔHfus
- q = m ΔHvap (correct)
- q = m ΔT
- q = m c ΔT
What is the amount of energy (in kJ) needed to heat 346 grams of liquid water from 0°C to 182°C, given that the specific heat of water is 4.184 J/g°C and the Δhvap of water is 40.79 kJ/mol?
What is the amount of energy (in kJ) needed to heat 346 grams of liquid water from 0°C to 182°C, given that the specific heat of water is 4.184 J/g°C and the Δhvap of water is 40.79 kJ/mol?
- 1,470.65 kJ
- 11,777.24 kJ
- 5,888.62 kJ (correct)
- 2,941.30 kJ
How can the effect of a heating curve be achieved using CO2 or dry ice?
How can the effect of a heating curve be achieved using CO2 or dry ice?
- By heating the dry ice to its critical point and then its triple point.
- By cooling the dry ice to its sublimation point and then its deposition point.
- By heating the dry ice to its melting point and then its boiling point.
- Because carbon dioxide cannot exist as a liquid at atmospheric pressure, the dry ice sublimates and instantly produces a gas, condensing water vapor, and creating a thick white fog. (correct)
What are the three main areas shown in a phase diagram?
What are the three main areas shown in a phase diagram?
What are the three main curves shown in a phase diagram?
What are the three main curves shown in a phase diagram?
What are the two important points shown in a phase diagram?
What are the two important points shown in a phase diagram?
Which of the following statements is true about the effect of heating a substance?
Which of the following statements is true about the effect of heating a substance?
What is the purpose of a heating curve?
What is the purpose of a heating curve?
If the temperature of a substance decreases, which of the following is true?
If the temperature of a substance decreases, which of the following is true?
What does the specific heat of a substance represent?
What does the specific heat of a substance represent?
When a substance undergoes a phase change during heating, what is observed?
When a substance undergoes a phase change during heating, what is observed?
Which of the following calculations can be performed using the specific heat of a substance?
Which of the following calculations can be performed using the specific heat of a substance?
What is the critical point on a phase diagram?
What is the critical point on a phase diagram?
What happens to the melting point of water at higher pressures?
What happens to the melting point of water at higher pressures?
What is true about the triple point of a substance?
What is true about the triple point of a substance?
Which term describes a phase that exhibits properties of both gas and liquid?
Which term describes a phase that exhibits properties of both gas and liquid?
What is the significance of the critical temperature and pressure for a substance?
What is the significance of the critical temperature and pressure for a substance?
Which phase change occurs when a substance goes from a solid directly to a gas?
Which phase change occurs when a substance goes from a solid directly to a gas?
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