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Determine the phase changes that carbon dioxide undergoes as the pressure changes if the temperature is held at −50 °C? If the temperature is held at −40 °C? At 20 °C?
- 8.1: Heating Curves and Phase Changes
The heat needed to change the temperature of a given...
- 8.7.7: Phase Change and Latent Heat
There is no temperature change until a phase change is...
- 8.1: Heating Curves and Phase Changes
The heat needed to change the temperature of a given substance (with no change in phase) is: q = m × c × ΔT (see previous chapter on thermochemistry). The heat needed to induce a given change in phase is given by q = n × Δ H .
Explain changes in heat during changes of state, and describe latent heats of fusion and vaporization; Solve problems involving thermal energy changes when heating and cooling substances with phase changes
If there were a change in the phase of matter (solid $\Leftrightarrow$ liquid or to liquid$\Leftrightarrow$ gas) read the following page to learn more: Solved problems on latent heat of fusion. Solved Problems on latent heat of vaporization.
ANSWERS – Phase Changes and Latent Heat 1. What is latent heat? The amount of energy (enthalpy) required to change the phase of matter for a substance. 2. Why does the temperature of H 2 O not increase when it is melting? Explain your answer by drawing a heating/cooling curve for water. The temperature does not increase because all the
Determine the result of adding 500 J of heat to the water in this state. [Hint: The latent heat of vaporization of water is 2260 J/g.] Learn Latent Heat & Phase Changes with free step-by-step video explanations and practice problems by experienced tutors.
There is no temperature change until a phase change is complete. Latent heat is measured in units of J/kg. Both \(L_{\mathrm{f}}\) and \(L_{\mathrm{v}}\) depend on the substance, particularly on the strength of its molecular forces as noted earlier. \(L_{\mathrm{f}}\) and \(L_{\mathrm{v}}\) are collectively called latent heat coefficients.
