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- 1. Multiple Choice
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 Choice
the symbol for specific latent heat is
c
L
Q
m
- 3. Multiple ChoiceWhat is the equation to measure change in Thermal Energy?Q=mc∆tQ=mcQ= ∆mctm=QC
- 4. Multiple Choice
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 Choice
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 ChoiceWhat 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 ChoiceWhat unit do you use to measure Thermal Energy?J/Kg ºCKgºCJ
- 8. Multiple Choice
There are four main processes in changing of phase, and they are
Melting
Boiling
Condensation
All the above
- 9. Multiple Choice
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 Choice
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 Choice
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 ChoiceThe 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 ChoiceWhat letter represents boiling?BCDE
- 14. Multiple ChoiceWhat letter represents a liquid being heated?ABCD
- 15. Multiple ChoiceWhat is the latent heat of fusion?4.6 kJ838.4 kJ10.15 kJ3.0 kJ
- 16. Multiple ChoiceWhy 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 ChoiceWhat is labelled "B" on the graph?solidsliquidsgasesa phase change
- 18. Multiple ChoiceAt which point is the substance a solid?ACEB
- 19. Multiple ChoiceDuring a phase change, the temperature...IncreasesDecreasesDoes nothingFluctuates
- 20. Multiple ChoiceLatent 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.
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