fibrown 2 years ago Which of the following describes an exothermic reaction? Thermal energy is absorbed by the system. Thermal energy is absorbed by the surroundings. Thermal energy is not transferred. The initial and final temperatures of the system remains the same What is the specific heat of a substance if 12.6 grams of the substance requires 0.119 kilojoules of heat to increase the temperature by 5.9 degrees Celsius? 1.6 x 100 J/g·°C 1.6 x 10−3 J/g·°C 1.6 x 103 J/g·°C 6.2 x 10−1 J/g·°C Can someone help please !!!

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1. chmvijay

what is exothermic reaction :)

2. fibrown

Im not sure its last minute chemistry work for school . Im getting confused and cant find the answer

3. emcrazy14

An exothermic reaction is one where thermal energy is given out or you could say lost by the system. So option 2 is correct i.e thermal energy is absorbed by surroundings.

4. emcrazy14

For the second question, do you know this formula? $E=mc \Delta \theta$ where E= thermal energy required m= mass c= specific heat capacity $\Delta \theta$= change in temperature Rearranging the equation, you get $c= E/ m \Delta \theta$ Now you can plug in the values to get your answer.

5. mathslover

Good work emcrazy14. And @fibrown : $$\LARGE{\textbf{Welcome to OpenStudy!}}$$

6. emcrazy14

Thank you! :)