Please answer question 2 & 3 I have already answered question 1. CH 110 Pre-Lab

Question

Please answer question 2 & 3 I have already answered question 1. CH 110 Pre-Lab revised Fall 2017 HESS LAW AND THE FIRST LAW OF THERMODYNAMICS 1. (a) IN YOUR OWN WORDS, explain how Hess' Law (of constant heat summation) applies to the 3 chemical reactions that will be studied in this experiment. (Note: answers copied from any source will NOT receive credit (b) Is energy released or absorbed for an exothemic reaction? (c) what is the sign (ositive or negative) for the AH of an exothermic reaction ? (d) Use the heat capacity of the calorimeter given and the equation in the middle of p. 38 to calculate the heat gained by the calorimeter if the T for a reaction was 5.86 'C. 2. Describe the procedure for this experiment. This can be in an outline format or a flow chart or (This should be between ½ paragraph format. It should not be copied directy from the manual. and one page. you may use the back of the page.) 3. Briefly discuss the safety precautions related to this experiment (chemical and equipment related)

Explanation / Answer

Ans. (a) According to hess law of constant heat summation states that enthalpy change for the given reaction is constant or same either it takes one step or more steps.

Ans (b) In case of exothermic reaction, heat is released during the course of the reaction.

Ans (c) for an exothermic reaction, dH = -ve

Ans (d) dH = m c dT

m = mass of substance, c = specific heat of substance, dT = change in temp.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---