Advertisements
Advertisements
Questions
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C? [c = 1 kcal/kg°C]
Advertisements
Solution
Given: Mass (m) = 5 kg, specific heat of water (c) = 1 kcal/kg °C
Change in temperature (ΔT) = 100 − 20
= 80°C
According to the principle of heat exchange,
Energy supplied to water = Energy gained by water
= Mass of water × specific heat of water × rise in the temperature of water
Q = mc ΔT
Q = 5 × 1 × 80
= 400 kcal
The heat energy necessary to raise the temperature of the water is 400 kcal.
APPEARS IN
RELATED QUESTIONS
A geyser heats water flowing at the rate of 3.0 litres per minute from 27 °C to 77 °C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 4.0 × 104 J/g?
What do you understand by the following statements:
The heat capacity of the body is 60JK-1.
A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.
What do you mean by the following statement?
The specific heat capacity of copper is 0. 4 Jg-1 K-1?
Ice cream appears colder to the mouth than water at 0℃. Give reason.
A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg°C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg°C. If we drop a piece of ice of mass 10 g at 0°C, What will be the temperature of the mixture?
Give two reasons as to why copper is preferred over other metals for making calorimeters.
Ice-cream at 0°C feels colder than water at 0°C. Give reason for this observation.
A piece of iron of mass 2.0 kg has a thermal capacity of 966 J/°C. What is its specific heat capacity in S.I. units?
Write a short note.
Specific heat capacity
Explain how heat capacity of a solid can be determined by the method of mixture.
Consider the statement given below and choose the correct option.
Assertion: Radiation is a form of heat transfer which takes place only in vacuum.
Reason: The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.
The value of 'γ' for a gas is given as `gamma = 1 + 2/"f"`, where 'f ' is the number of degrees of freedom of freedom of a molecule of a gas. What is the ratio of `gamma_"monoatonic"//gamma_"diatomic"`?
Diatomic gas consists of rigid gas molecules
Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.
Conductors have generally high specific heat capacities and insulators have low specific heat capacities.
Match the following
| 1. | Specific heat capacity | a. | Dewar bottle |
| 2. | Calorimeter | b. | Lavoisier and Simon |
| 3. | Vacuum flask | c. | J Kg-1 K-1 |
| 4. | Ice – calorimeter | d. | Heat capacity |
A metal ball of heat capacity 50J/°C loses 2000 J of heat. By how much will its temperature fall?
Find the odd one out:
A block of ice of mass 120 g at temperature 0°C is put in 300 gm of water at 25°C. The xg of ice melts as the temperature of the water reaches 0°C. The value of x is ______.
[Use: Specific heat capacity of water = 4200 Jkg-1K-1, Latent heat of ice = 3.5 × 105 Jkg-1]
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cv is equal to ______.
