3. A 4.00 gram sample of solid gold was heated from 274K to 314K. How much energy was involved?
1 answer:
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The kinetic energy and the physical state of water depend strongly on the temperature;
- Firstly, The kinetic energy of water on a hot stove is higher than that on the counter in the freezer; that the kinetic energy is directly proportional to the temperature according to the relation:
; where R is the universal gas constant, T is the temperature and NA is Avogadro number.
As the temperature increases, the speed of colliding molecules increases and the kinetic energy increases.
- Secondly, The physical state of water depends on the temperature; water has three states (gas, liquid and solid) depends on the temperature.
- If a glass of water is putt on the counter in the freezer, it will be converted to the solid state (ice).
- And, as if it is putt on a hot stove, it will be vapor (gaseous state).
Answer:
17.41°C is the change in temperature of the aluminum block.
Explanation:
Latent heat of fusion water = 334 J/g
Heat required to freeze 1 gram of water = -334 J
Heat required to freeze 2.58 grams of water = Q
Heat lost by water will be equal to heat gained by the aluminum block
Formula used to calculate heat absorbed by substance:
Where:
Q = heat absorbed by substance
c = specific heat of substance
m = Mass of the substance
ΔT = change in temperature of the substance
We have :
Mass of aluminum block= m= 55 g
Heat capacity of aluminum = c = 0.9 J/g°C
Change in temperature of the aluminum block= ΔT = ?
Heat absorbed by the aluminum = Q'
17.41°C is the change in temperature of the aluminum block.