Which of these is true of chemical reactions? A.) all of these are true

B.) In a chemical reaction, one or more substances undergo a change in state.

C.) In a chemical reaction, one or more new substances are formed from one or more other substances.

D.) In a chemical reaction, the substances that are combined always form a gas.

i'm pretty sure its b i might be wrong though!

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може ли да зареждате повече информация, моля

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.