Solution: According to the question, mass of ice is mice= 200 g Time (t1) for ice to melt is 1 min, or 60 s Mass of water is mw = 200 g Temperature change of water is ΔT = 200 C Heat exchange occurs...

Specific heat capacity of ice = 2100 J kg-1 K-1, Specific heat capacity of water is 4200 J kg-1 K-1. Solution: According to the question, 1 kg of ice at -10oC is completely converted into water at...

Specific heat capacity of ice = 2.1 J g-1 K-1, specific heat capacity of water = 4.2 J g-1 K-1, specific latent heat of fusion of ice = 336 J g-1. Solution: According to the question, 100 g of ice...

Given: Specific heat capacity of water = 4200 J kg-1 K-1, specific latent heat of ice = 336 × 103 J Kg-1. Solution: According to the question, 2 kg of ice melts when water at 100oC is...

Solution: According to the question, ice of mass 40 g is added to 200 g of water at 50oC. WE have to calculate the final temperature when all the ice has melted. Let this final temperature of the...

Solution: According to the question, 10 g of ice at -10oC is mixed with 10 g of water at 10oC. And, heat capacity of ice = 2.1 J g-1 K-1, specific latent heat of ice = 336 J g-1, and specific heat...

Solution: According to the question Mass of ice (m1) is 17 g Mass of water m2 is 40 g Change in temperature is given by 34 – 0 = 34 K We know that the specific heat capacity of water is 4.2 J...

Solution: According to the question, mass of water is 100g at 20 degrees C is converted to ice at -10 degrees C in 73.5 mins. We will first calculate the heat energy by using the following...

(a)What is the specific latent heat of the metal? (b) If the specific heat capacity of metal is 200 J kg-1 K-1, how much additional heat energy will the metal give out in cooling to – 50oC?...

Solution: According to the question, mass of water m is 5.0 g Specific heat capacity (c) of water is 4.2 J g-1 K-1 Specific latent heat of fusion (L) of ice is 336 J g-1 In order to calculate the...

Solution: According to the question, Mass of ice = 10 g = 0.01 kg Amount of absorbed heat energy is Q = 5460 J We have to find the specific latent heat of fusion of ice. We are given that the...

(a) 80 cal g-1 (b) 2260 J g-1 (c) 80 J g-1 (d) 336 J kg-1 Solution: The correct option is (a). The specific latent heat of fusion of water is 80 cal g-1

(a) cal g-1 (b) cal g-1 K-1 (c) J kg-1 (d) J kg -1 K-1 Solution: The correct option is (c). The S.I. unit of specific latent heat is J kg-1

Solution: Temperature Time Graph

(a)What do parts AB, BC, CD and DE represent? (b) What is the melting point of the substance? (c) What is the boiling point of the substance? Solution: (a) The AB section depicts the solid's...

(i) The surroundings become pleasantly warm when water in a lake starts freezing in cold countries. (ii) The heat supplied to a substance during its change of state, does not cause any rise in its...

Solution: Ice has a sufficiently high specific latent heat of fusion of 336 J g-1. Before freezing, the water in lakes and ponds must release a considerable amount of heat into the atmosphere. The...

Solution: The reason for this is that the heat energy needed to defrost the frozen lake is absorbed from the atmosphere. As a result, the temperature of the environment drops, and it becomes...

Solution:...

Solution: To melt 1 g of ice into water at 0 C, it needs 336 J of heat energy from the drink. As a result, the bottle loses 336 J more heat energy to 1 g ice at 00 C than it does to 1 g ice-cold...

Solution: (a) At 0 degrees Celsius, 1 g of ice requires extra heat because ice requires more heat energy equal to the latent heat of melting.(b) At 0 degrees Celsius, 1 g of ice absorbs 336 J of...

Solution: At 0 degrees Celsius, 1 g of water has more heat than 1 g of ice. This is due to the fact that ice at 0°C absorbs 360 J of heat energy to convert to water at 0°C.

Solution: 1 g ice at 0o C melts to form 1 g water at 0o. Because ice requires heat to melt, it will absorb heat in the form of latent heat and maintain a constant temperature until it melts.

Solution: The specific latent heat of fusion of ice is 336 J g-1. This implies that 1 g of ice at 00 C absorbs 336 J of heat energy in order to convert into water at 00 C.

Solution: The approximate value of specific latent heat of ice is 336000 J kg-1

Solution: The thermal energy required to melt a unit amount of ice at 0 degrees C to water at 0 degrees C without changing the temperature is known as the specific latent heat of fusion of ice.

Solution: The latent heat is the heat energy absorbed or released during a phase shift that is not externally expressed as a rise or fall in temperature.

(a) Volume of ice …………. when it melts. (b)Decrease in pressure over ice ………….. its melting point. (c)Increase in pressure ………..the boiling point of water. (d)A pressure cooker is based on the...

Solution: At high altitudes, atmospheric pressure is low. As a result, the boiling point of water drops, and it is unable to give the necessary thermal energy to its contents for cooking. As a...

Solution: The water boils at about 1200 C to 1250 C in a pressure cooker.

Solution: With increasing pressure, the boiling point of a liquid rises and falls with decreasing pressure. Pure water has a boiling point of 1000 degrees Celsius at one atmosphere of pressure....

Solution: The boiling point of a liquid increases with the increase in pressure. Explanation - The energy required for the liquid molecules to expand to the gas phase increases as the pressure...

Solution: When you add salt to water, it raises its boiling point. When ordinary salt is added to water, it boils at over 1000 degrees Celsius. Cooking becomes easier and faster as the salt in the...

Solution: When water boils at 100°C, its volume increases dramatically and its condition changes from liquid to steam. Although the temperature does not change during boiling, the volume expands due...

Solution: Boiling is the transition from a liquid to a gas phase due to the absorption of heat at a constant temperature.The boiling point of a liquid is defined as the temperature at which it...

Solution: The melting point of ice decreases as pressure increases. For every one atmosphere increase in pressure, the melting point of ice drops by 0.00720 C.

Solution: When impurities are present in a substance, its melting point drops.This is used to make a freezing combination by combining salt with ice. Kulfis are made with the freezing mixture.

Solution: (a) Molecules' average kinetic energy remains constant.(b) Molecules' average potential energy rises.Explanation: When a substance is heated to a constant temperature, i.e., during its...

Solution: (i) The average kinetic energy of molecules increases with the increase in temperature. (ii) Average potential energy of molecules increases with a change in its phase.

a. Name the process. b. What name is given to heat observed by the substance. c. How does the average kinetic energy of the molecules of the substance change. Solution: (a) This...

(b)Is there any change in temperature during the change of phase? (c)Does the substance absorb or liberate any heat during the change of phase? (d) What is the name given to the energy absorbed...

Solution: We know that the Heat energy = Power × time Also we can write in the following manner - Heat energy = mc(change in temperature) Therefore, we can write => mc(change in temperature) = Power...

Solution: According to the question, Mass of hot water (m1) is 300 g Temperature (T1) is 500 C Mass of cold water (m2) is 600 g Change in the temperature of cold water (T – T2) is 150 C Let the...

Solution: According to the question, Mass of hot water (m1) is 200 g Temperature of hot water (T1) is 800 C Mass of cold water (m2) is 300 g Temperature of cold water (T2) is 100 C We have to find...

Solution: According to the question, Mass of water (m1) is 45 g Temperature of water (T1) is 500 C Mass of copper (m2) is 50 g Temperature of copper (T2) is 180 C We have to find the final...

Solution: According to the statement, mass of the metal is 50g and the change in temperature is equal to (150 – 20) Then using the expression for heat energy, we have - Heat lost by metal = m × s ×...

Solution: According to the question, Change in temperature = 30 – 5 = 25 K We know that the expression for heat energy is => △Q = mc△T Substituting values, we get △Q = 0.5 × 4200 × 25 = 52500 J Heat...

(i) the heat capacity of 4.0 kg of liquid, and (ii) the specific heat capacity of liquid Solution: According to the statement, Power (P) of heater is 600 W Mass (m) of liquid is 4.0 kg Change in...

Solution: According to the question, we have - Specific heat capacity (c) of the material is 960 J kg-1 K-1 Change in temperature becomes △T = (38 – 18)0 C = 200 C or, △T = 20 K (temperature...

Solution: According to the question, Heat energy supplied is 1300 J and the mass of lead is 0.5 kg Also the change in temperature is (40 – 20)0 C = 200 C Expression for specific heat capacity of...

Solution: According to the question, Mass of copper m is 100 g = 0.1 kg Change of temperature is △t = (70 – 20)0 C = 500 C Also the specific heat capacity of copper is 390 J kg-1 K-1 Expression for...

(i) Heat energy needed to warm it by 15oC, and (ii) Its specific heat capacity in S.I unit. Solution: (i) We know that the heat energy required is given by the product of heat capacity and...

(b)How much heat energy will be required to increase the temperature of the vessel in part (a) from 25oC to 35oC? Solution: (a) According to the question, Mass of copper vessel is 150 g, or 0.15 kg...

Solution: One degree on the Kelvin scale is the same size as one degree on the Celsius scale. As a result, the temperature difference or change is the same on both the Kelvin and Celsius scales. As...

(a) 4200 J kg-1 K-1 (b) 420 J g-1 K-1 (c) 0.42 J g-1 K-1 (d) 4.2 J kg-1 K-1 Solution: The correct option is (a). The specific heat capacity of water is 4200 J...

(a) J kg-1 (b) J K-1 (c) J kg-1 K-1 (d) kcal kg-10C-1 Solution: The correct option is (c). The S.I. unit of specific heat capacity is J kg-1 K-1

(a) J kg-1 (b) J K-1 (c) J kg-1 K-1 (d) cal 0C-1 Solution: The correct option is (b). The S.I. unit of heat capacity is J K-1.

Solution: The base of a cooking pan is thick and heavy because it has a large heat capacity, which allows it to heat up slowly and impart sufficient heat energy to the food for proper cooking. It...

(b)Name the material of which it is made of. Give two reasons for using the material stated by you. (c) Out of the three metals A, B and C of specific heat 900 J kg-1 °C-1, 380 J...

Solution: Because liquid X has a higher specific heat capacity than liquid Y, the temperature rise for X will be smaller than for Y for the same mass and heat energy. (i) As a coolant in automotive...

Solution: (i) Water is used as a coolant in automotive radiators and generators. (ii) To prevent wine and juice bottles from freezing, water is employed as a heat reservoir.

Solution: The heat energy from heated sections of a machine is eliminated by allowing water to flow in pipes surrounding them. Because of its high specific heat capacity, water in pipes may extract...

Solution:...

Solution: Water has an extremely high specific heat capacity, around five times that of sand. As a result, the heat energy required to raise the temperature by a given mass of water is roughly five...

Solution: If the air temperature drops below 0 C on a cold winter night, water in the fine capillaries of plants freezes. It causes the veins to burst due to the increase in volume of water caused...

Solution: According to the statement, a mass m1 of a substance A having specific heat capacity c1 at temperature T1 is mixed with a mass m2 of other substance B having specific heat capacity c2 at a...

Solution: The amount of heat energy lost by the hot body is equal to the amount of heat energy absorbed by the cool body. This is known as the principle of the method of mixture. The principle of...

Solution: Let Cp and Cq denote the specific heat capacities of blocks P and Q respectively According to the question, the mass ratio of P and Q is 2:1. Therefore, if mass of Q is m then the mass of...

Solution: The temperature rises quickly and dramatically when a substance has a low specific heat capacity. As a result, liquid A has a lower heat capacity than liquid B.

Solution:...

Solution: The heat energy absorbed by a body is determined by three parameters. (i) Body mass: The amount of heat energy required is directly proportional to the object's mass. (ii) Increase in body...

Solution: Such factors on which the heat energy liberated by a body upon cooling depends are as follows: (i) Mass of that body (ii) Specific heat capacity of that body (iii) Temperature of that...

Solution: Substance B has a lower specific heat capacity than substance A. As a result, given the same mass and heat energy, B's temperature rise will be greater than A's. The lower a substance's...

(i) The heat capacity of a body is 50 JK-1? (ii) The specific heat capacity of copper is 0.4 J g-1 K-1? Solution: (i) According to the statement, the heat capacity of a body is 50 JK-. This...

Solution: The specific heat capacity of water is approximately 4200 J kg-1 K-1. Water is the liquid with the highest specific heat capacity. The amount of heat that one gram of a substance needs...

Solution: Water has the highest specific heat capacity. Explanation : The high heat capacity of water is due to hydrogen bonding between water molecules. Hydrogen bonds are destroyed when heat is...

Solution: Heat Capacity (a) The quantity of heat energy necessary to elevate the temperature of the entire body by 10 degrees Celsius is known as heat capacity.(b) It is determined by the body's...

Solution: The equation that links a body's heat capacity to its substance's specific heat capacity is Mass x Heat Capacity = Specific Heat Capacity

Solution: The amount of heat energy essential to raise the temperature of a unit mass of a substance by 10C (or 1 K) is known as the specific heat capacity of that substance. Joule per kilogram per...

Solution: The amount of heat energy required to raise its temperature by 10C or 1 K is termed as the heat capacity of a body. The S.I. unit of heat capacity is joule per kelvin (JK-1).

Solution: Calorimetry is the measurement of the quantity of heat.

Solution - Heat Heat is a type of internal energy created when molecules in a substance move randomly and attract each other.The joule is the SI unit of heat (J).The principle of calorimetry is used...

Solution: When two bodies of differing temperatures come into contact. Then the temperature is the quantity which dictates the direction of heat flow. Kelvin is the SI unit of temperature (K).

Solution: The heat energy essential to raise the temperature of 1 kg of water from 14.50 C to 15.50 C is known as One kilo-calorie.

Solution: The thermal energy required to increase the temperature of 1 g of water from 14.50 C to 15.50 C is equal to one calorie. The S.I. unit joule is related to the calorie in the following way:...

Solution: Heat is defined as the internal energy of the molecules that make up the body. When two bodies are kept in contact, it flows from the hot one to the cold one. Joule is the S.I. unit of...

Solutions: Heat is defined as the internal energy of the molecules that make up the body. When two bodies are kept in contact, it flows from the hot one to the cold one.