Which of the following is true about chemical reactions. a. they are accompanied by changes in energy. b. they form new substances with new properties. c. both a & b
d. neither a nor b

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Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

The conventional equilibrium constant expression (kc) for the system below is: 2icl(s) ⇄ i2(s) + cl2(g) [cl2] ([i2] + [cl2])/2[icl] [i2][cl2]/[icl]2 none of the listed answers are correct [i2][cl2]/2[icl]