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- 1. Multiple-choice1 minute1 pt
This formula is used to find the amount of heat (energy) neccesary when there's a phase change
Q= (h)(ΔT)
Q=(m)(L)
Q=(m)(c)(ΔT)
Q=(k)(A)(dT)
- 2. Multiple-choice5 seconds1 pt
the symbol for specific latent heat is
c
L
Q
m
- 3. Multiple-choice30 seconds1 ptWhat is the equation to measure change in Thermal Energy?Q=mc∆tQ=mcQ= ∆mctm=QC
- 4. Multiple-choice15 minutes1 pt
How much heat must be lost to change of 110 grams of water at 0 ºC to 110 grams of ice at 0ºC? Heat of fusion = 334 kJ/kg; Specific heat of water = 4186 J/kgoC
Q = 110 x 4186
Q = 110000 x 4186
Q = 0.110 x 334
Q = 110 x 334
- 5. Multiple-choice2 minutes1 pt
If the specific heat of water is 4,186 J/kg°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?
Q = 1.2 x 4186
Q = 1.2 x 4186 x 7
Q = 1.2 x 4186 x 17
Q = 0.0012 x 4186 x 17
- 6. Multiple-choice30 seconds1 ptWhat is the formula to calculate heat energy required to raise the temperature of any substance?Q = m Cp ∆TQ = m CpQ = ½ m vm = Q Cp
- 7. Multiple-choice1 minute1 ptWhat unit do you use to measure Thermal Energy?J/Kg ºCKgºCJ
- 8. Multiple-choice10 seconds1 pt
There are four main processes in changing of phase, and they are
Melting
Boiling
Condensation
All the above
- 9. Multiple-choice10 seconds1 pt
The heat absorbed by melting a solid is known as
latent heat of fusion
latent heat of solid
latent heat of liquid
latent heat of vaporisation
- 10. Multiple-choice30 seconds1 pt
The graph shows the cooling curve of a substance. At which stages the specific latent heat released?
AB and CD
BC and DE
AB and EF
BC and CD
- 11. Multiple-choice45 seconds1 pt
Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?
Part I
Part II
Part III
Part IV
- 12. Multiple-choice1 minute1 ptThe graph shows the cooling curve of a substance.
The specific latent heat released at stages?CD and FGDE and EFEF and FGDE and FG - 13. Multiple-choice45 seconds1 ptWhat letter represents boiling?BCDE
- 14. Multiple-choice45 seconds1 ptWhat letter represents a liquid being heated?ABCD
- 15. Multiple-choice3 minutes1 ptWhat is the latent heat of fusion?4.6 kJ838.4 kJ10.15 kJ3.0 kJ
- 16. Multiple-choice30 seconds1 ptWhy does the graph have two flat lines at "b" and "d"?Those are times when we took the water off the hot plateThose are phase changes where temperature doesn't change while adding heatThe line is flat because the water is all in the solid or gas phaseThe line is flat because temperature increases the most at those locations
- 17. Multiple-choice30 seconds1 ptWhat is labelled "B" on the graph?solidsliquidsgasesa phase change
- 18. Multiple-choice45 seconds1 ptAt which point is the substance a solid?ACEB
- 19. Multiple-choice45 seconds1 ptDuring a phase change, the temperature...IncreasesDecreasesDoes nothingFluctuates
- 20. Multiple-choice30 seconds1 ptLatent heat is____the energy required to change temperature.the energy required to make or break intermolecular bonds.represented by a vertical line on a heating curve.ridicules.
