1. How much heat energy is lost by 3 kg of water when it cools from 80 degrees C to 10 degrees C?

2. A 300 g piece of aluminum is heated from 30 degrees C to 150 degrees C. What amount of heat energy is absorbed?

3. Determine the temperature change in each of the following.
(a) 10 kg of water loses 232 kJ of heat energy.
(b) 500 g of copper gains 1.96 kJ of heat energy.

4. After 2 kg of mercury gained 2.52 x 10^4 J of heat energy, its final temperature was 130 degrees C. What was its initail temperature?

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. recall that heat absorbed or released is given by
    Q = mc(T2 - T1)
    m = mass (in kg)
    c = specific heat capacity (in J/kg-K)
    T = temperature (in C or K)
    *note: Q is (+) when heat is absorbed, and (-) when heat is released.

    #1. we just substitute. the c for water is equal to 4.184 J/kg-K (you can google this or look for this in books):
    Q = mc(T2-T1)
    Q = 3*4.184*(10-80)
    Q = -878.64 J
    *note that it is negative since it cooled, and thus released heat.

    #2,3 and 4: just substitute the given values and solve for the unknown. be careful with units.

    hope this helps~ :)

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  2. 7 8

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  3. Nice but somewhat you would have included the step of all the problems

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  4. #1-877,590 J

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  5. #1=-877,590 J

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics repost bobpursley

    The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what?

  2. science

    Study the scenario.A small container of water with a low temperature is poured into a large container of water with a higher temperature. Which choice correctly explains what happens to the thermal energy of these systems? A)The

  3. Science

    1. What would happen if earth absorbed all of the heat from the sun? A. Earth would become too cold. B. Earth would be too hot. C. Earth would eventually stop recieving heat. D. Earth would lose all of it's own heat.

  4. Science

    When 3.0 kg of water is cooled from 80.0C to 10.0C, how much heat energy is lost?

  1. Chemistry

    CH4 + 2 O2 --> CO2 + 2 H2O + heat This reaction is exothermic because more energy is released when the products bond than is required to break the bonds of the reactants. The potential energy of the products (not including the

  2. Chemistry

    Calculate the heat released when 10.0 g of water at 25.0°C cools to ice at 0.0°C. The specific heat of water is 1.00 cal/(g × °C); the heat of fusion is 80.0 cal/g; and the heat of vaporization is 540.0 cal/g.

  3. chemistry

    LP gas burns according to the exothermic reaction: C3H8(g) + 5 O2(g) right arrow 3 CO2(g) + 4 H2O(g) ΔHrxn° = −2044 kJ What mass of LP gas is necessary to heat 1.2 L of water from room temperature (25.0°C) to boiling

  4. Physics -- check answers please

    1. Which of the following best shows the transfer of heat by radiation? my answer: c 2. Which of the following best shows the transfer of heat by convection? my answer: b 3. Water has specific heat of 4200 J per kilogram per

  1. chemistry

    What will be the final temperature of the water in an insulated container as the result of passing 5.00 g of steam [H2O(g)] at 100.0°C into 195.0 g of water at 20.0°C? (?H°vap = 40.6 kJ/mol H2O) The best way to do these

  2. Physics- LOST!

    If the air temperature is the same as the temperature of your skin (about 30.0 C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During

  3. Chemistry

    how many joules of heat are lost by 3580kg granite as it cools from 41.2c to -12.9c?

  4. Chemistry-Dr.Bob

    An unknown piece of metal weighing 100. g is heated to 90.0 degrees Celcius. It is dropped into 250 g of water at 20.0 degrees Celcius. When equilibrium is reached, the temperature of both the water and piece of metal is 29.0

View more similar questions or ask a new question.