GP Q2 Quiz 8 Name Equations: AQ = mL Q . cmAT Power energy/time latent heat of v
ID: 1875319 • Letter: G
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GP Q2 Quiz 8 Name Equations: AQ = mL Q . cmAT Power energy/time latent heat of vaporization of water- 2.26x 10° 1/kg. latent heat of fusion of ice = 335,000 l/kg Ctm 20001/kg C co 385 1/kg C Row location Seat (as measured from the Periodic Table) Class: 10AM or 12PM Passing steam through a cup of flavored milk makes a hot chocolate drink. Assuming that milk has the same specific heat capacity as water, that the steam is initially at 120 °C, and that the milk warms from 10 °C to 65 °C. 1. Describe changes that result in 40 0(eg, when the milk warms) IDescribe changes that result in 4Q 0 (eg, when the ice warms) Describe changes that result in 4Q 0AT for the changeChanges where AQExplanation / Answer
1. assuming specific heat of milk = specific heat of water, c = 4186 J/kg K
Ts = 120 C
Ti = 10 C
T = 65 C
a. for dQ > 0 ( milk gets warm)
when steam passes through milk, it heats up
dT = 65 - 10 = 55 K
for dQ < 0
steam loses energy
dT cannot be calculated without knowing masses of individial species
2. when ice warms from -10 to 0 C, dQ > 0
when it starts melting at same temperature, dQ > 0
when molten water becomes hotter, dQ > 0
dT = 40 K
dQ < 0 when hot water becomes cold becaus eof ice
dT = 40 K
3. latent heat is hidden as it does not raise temperature of the sample
hence
option A
4. for latent heat of fusion to be -ve, heat is released
so the object is turning from liq to solid
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