From equations (i) and (ii): ΔQ = mcΔθ = W x 1 x Δθ. The product of the mass of a substance by its specific heat equal numerically to the mass of water that is equivalent in thermal capacity
What is water equivalent of a substance?
Answer: A substance’s water equivalent is equivalent to the amount of water that is required to consume the same quantity of heat as that substance does for a temperature rise of one degree . The water equivalent of a body is indeed equivalent to the product of its mass and its specific heat.
What is water equivalent in a calorimeter?
The water equivalent of a calorimeter is defined as the mass of water that will absorb or lose as same quantity of heat as the substance for the same change in temperature .
How will you determine the water equivalent of the flask?
Heat absorbed by the flask may be considered as equivalent to the heat absorbed by a certain mass of water for the same change in temperature, assuming the specific heat of water to be 1 calorie per gram . This calculated mass of water is called the water equivalent of the flask.
What is the formula of water equivalent?
From equations (i) and (ii): ΔQ = mcΔθ = W x 1 x Δθ . The product of the mass of a substance by its specific heat equal numerically to the mass of water that is equivalent in thermal capacity
Why is water not a good calorimetric liquid?
The specific heat of water is higher than all other common substances. ... Off all the liquids, mercury has the lowest specific heat due to which it is used as a thermometric liquid .
Is water equivalent and heat capacity same?
The heat capacity and water equivalent of a substance are numerically equal but they have difference units of measurement.
What is the value of specific heat of water?
Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.
What is latent heat of fusion of water?
A total of 334 J of energy are required to melt 1 g of ice at 0°C, which is called the latent heat of melting. At 0°C, liquid water has 334 J g − 1 more energy than ice at the same temperature. This energy is released when the liquid water subsequently freezes, and it is called the latent heat of fusion.
Why do we generally use a calorimeter made of copper?
Since copper is a good conductor of heat
What is water equivalent bomb?
In a specific reaction the quantity of heat that raises the temperature of some substance by some amount, the same quantity of heat can simultaneously raise the same temperature of a certain mass of water assuming the specific heat of water to be 1 calorie per gram . The mass of water is then termed as water equivalent.
Why is it important to stir the water in a calorimeter?
Explanation: Well, so as to prevent hot-spots, and burning on the bottom of the pan. When you do a calorimetric experiment, you have a given mass of water, and you want the temperature rise of this mass to be uniform . So you stir it.
What is a calorimeter experiment?
A calorimeter is an insulated container that is used to measure heat changes . ... In a typical calorimetry experiment, specific volumes of the reactants are dispensed into separate containers and the temperature of each is measured. They are then mixed into the calorimeter, which starts the reaction.
What is Q in Q MC ∆ T?
Q = mc∆T. Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/kg∙K) ∆ is a symbol meaning “the change in”
Why is a bomb calorimeter more accurate?
The temperature increase is measured and, along with the known heat capacity of the calorimeter, is used to calculate the energy produced by the reaction. Bomb calorimeters require calibration to determine the heat capacity of the calorimeter and ensure accurate results.
Why is it a good idea to start with room temperature water in the calorimeter?
It is a good idea to start with room temperature water in the calorimeter because the room temperature water helps to determine the heating up/cooling down because of the environment as the experiment takes place . Because the calorimeter heat is the same as the heat of the water.
