Chemistry

Chemistry, 29.09.2019 03:10, russboys3

3. what is the change in temperature when 30g of water is heated
and releases 2130 cal of heat? the specific heat of water is 1.0
cal/g°c.

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Chemistry, 26.08.2019 00:20, heidibode

Calorimetry: 1. calculate the specific heat of an 25.0 gram object that generates 1500 joules of heat when the temperature is raised from 25.0˚ c to 75.0 ˚c. 2. how much heat is released by a 50.5 g sample of sample of water whose temperature was raised from 0.0 ˚c to 58.0 ˚c? (specific heat of water is 4.184j/g ˚c) 3. what mass of water is needed to raise the temperature from 50.0 c to 120.0 c. when it releases 4500.0j of heat

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Physics, 30.08.2019 07:50, leahstubbs

Ahot 0.25-kg piece of iron is placed in a calorimeter containing room temperature water. how much heat is lost by the iron as it cools from 125c to 75c? how much heat is gained by the water? 5. the temperature of 2.500 kg substance rises from 20 oc to 60 oc when it absorbs 23,500 joules of heat. calculate the specific heat capacity of the substance. what is the identity of the substance? 7. using the specific heat capacities of water and steam, explain which would be a better coolant for your car's engine if equal masses of each were used. 8. a cube of lead has a temperature of 18c. a second identical cube of lead is twice as hot. what is the temperature of the second lead cube? 2. for each pair of substances, identify the substance that will take more energy to heat from 20c to 100c and explain why. specific heat for water- 4180 j/kg°c. specific heat for silver- 235 j/kg°c. specific heat for iron- 450 j/kg°c. a. 30 g of water vs. 300 g of water b. 500 g of iron vs. 500 g of silver

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Engineering, 03.10.2019 02:00, andres2865

Astirrer of shaft power 500w is used to stir 100 kg of water that is being heated. the heater output power is 3.5 kw and heat losses are 800w. the initial temperature of the water is 20°c. determine: (a) how long it will take before the water reaches a temperature of 80°c, (b) the internal energy change of the water. neglect the specific heat capacity of the vessel itself and take the specific heat capacity of water to be 4.19 kj/kgk.

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Chemistry, 18.10.2019 17:10, tonimgreen17p6vqjq

Acoffee-cup calorimeter contains 140.0 g of water at 25.1°c . a 124.0-g block of copper metal is heated to 100.4°c by putting it in a beaker of boiling water. the specific heat of cu(s) is 0.385 j/g⋅k. the cu is added to the calorimeter, and after a time the contents of the cup reach a constant temperature of 30.3°c . (a)- determine the amount of heat, in j, lost by the copper block. enter the absolute amount of heat lost by cu, without a minus sign. (b)- determine the amount of heat gained by the water. the specific heat of water is 4.18 j/g⋅k. (c)-the difference between your answers for (a) and (b) is due to heat loss through the styrofoam → cups and the heat necessary to raise the temperature of the inner wall of the apparatus. the heat capacity of the calorimeter is the amount of heat necessary to raise the temperature of the apparatus (the cups and the stopper) by 1 k. calculate the heat capacity of the calorimeter in j/k. expressyour answer using two significant figures. (d)-what would be the final temperature of the system if all the heat lost by the copper block were absorbed by the water in the calorimeter?

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3. what is the change in temperature when 30g of water is heated
and releases 2130 cal of heat...

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