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To calculate the energy involved in a phase change We
uSe the formula
Q = nH
h = quantity of heat or enerqgy involved
= number of moles of substance to be considered
mi
Q = the amount of energy required or released when one
mole of the substance changes phase at the phase
change temperature
Phase Change Questions:
1. Calculate the amount of energy required to convert 100 g of
ice at 0.00*C to water at 0.00?C. (33.4
Iい=- らら ol
2. Calculate the amount of energy involved when 250 g of
steam at 100?C is condensed to water at 100?C. (-564
3.150 kJ are required to melt 20.0 moles of a solid at itS
melting temperature. Calculate the molar heat of fusion of
the solid. (50 kJの
(6必
1. What are the three phases Of matter ? (states of matter)
2. What is a phase change? (Chang@e of state)
* Please note: 4 Dase の72796 6 p7ys/cg/7 C77796, 707 る
ce/7/Cg/ C77g7706.
3. (a) What is the boiling point of water 0
(b) What is the freezing point of water の
4. (a) What happens to the temperature of water while it iS
boiling ?
(b) What happens to the temperature of steam while it iS
condensind ?
(c) What happens to the temperature of ice while it iS
melting ?
(d) What happens to the temperature of water while itiS
freezing ?
