Advertisements
Advertisements
Question
State two impacts of global warming on the life on earth.
Solution
(i) It is responsible for the climate changes in different parts of the world and it has forced people to migrate from one place to the other.
(ii) It has affected blooming season of the different plants.
APPEARS IN
RELATED QUESTIONS
Define calorimetry ?
What is a calorimeter?
Describe an experiment to show that there is absorption of heat energy when the ice melts.
Fig 11. 11 shows the variation in temperature with time when some wax cools from the liquid phase to the solid phase.
(i) In which part of the curve, the wax is in liquid phase?
(ii) What does the part QS of the curve represent?
(iii) In which part of the curve, the wax will be the in the liquid as well as solid phase?
(iv) In which part of the curve, the wax is in solid phase?
A piece of copper of mass 1 kg is dropped into 2 kg of water at 15°C. If the final temperature of the mixture is 40°C, calculate the intial temperature of copper.
Some heat is given to 120 g of water and its temp. rises by 10 K. When the same amount of heat is given to 60 g of oil, its temp. rises by 40 K. The Sp. heat of water is 4200 J/kgK. Calculate:
(a) The amount of heat in joules given to water,
(b) The specific heat capacity of the oil.
What mass of ice at 0°C will be required to cool 0.9 kg of water from 35°C to 0°C? Assume all the ice used melts. The specific heat capacity of water is 4.2 x 103 J/kgoC and specific latent heat of fusion of ice is 336 x 103 J/kg.
40g of ice at 0°C is used to bring down the temperature of a certain mass of water at 60°C to 10°C. Find the mass of water used.
[Specific heat capacity of water = 4200 J kg-1 °C-1]
[Specific latent heat of fusion of ice = 336 × 103 J kg-1]
Write one characteristic property of the material chosen for making a calorimeter.