Heat Transfer in Substances Quiz

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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?

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?

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?

Solid, Liquid, Gas Signup and view all the answers

What are the three main curves shown in a phase diagram?

Melting/Freezing, Vaporization/Condensation, Sublimation/Deposition Signup and view all the answers

What are the two important points shown in a phase diagram?

Critical point and triple point Signup and view all the answers

Which of the following statements is true about the effect of heating a substance?

The added heat is used to break attractive forces between particles, with no increase in temperature. Signup and view all the answers

What is the purpose of a heating curve?

To show the relationship between temperature and time during heating. Signup and view all the answers

If the temperature of a substance decreases, which of the following is true?

The kinetic energy of the particles decreases. Signup and view all the answers

What does the specific heat of a substance represent?

The amount of heat needed to raise the temperature of 1 gram of the substance by 1°C. Signup and view all the answers

When a substance undergoes a phase change during heating, what is observed?

No change in temperature. Signup and view all the answers

Which of the following calculations can be performed using the specific heat of a substance?

Finding the amount of heat required to raise or lower the temperature of a given mass by a certain amount. Signup and view all the answers

What is the critical point on a phase diagram?

The point where the liquid and gaseous phases merge into a single phase Signup and view all the answers

What happens to the melting point of water at higher pressures?

It decreases Signup and view all the answers

What is true about the triple point of a substance?

It represents equilibrium between all three phases of matter Signup and view all the answers

Which term describes a phase that exhibits properties of both gas and liquid?

Supercritical fluid Signup and view all the answers

What is the significance of the critical temperature and pressure for a substance?

They define when a supercritical fluid forms Signup and view all the answers

Which phase change occurs when a substance goes from a solid directly to a gas?

Sublimation Signup and view all the answers