Which statement about enthalpy is true?a. Heat is given off to the surroundings in endothermic reactions.b. Some substances have a negative specific heat capacity.c. Specific heat capacity is the same for all liquids.d. The sign of ∆H is always negative in exothermic reactions.

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What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed?a. ∆H has the same numerical value, and the sign changes.b. ∆H has the same numerical value, and the sign remains the same.c. ∆H is the reciprocal of the original value, and the sign changes.d. ∆H is the reciprocal of the original value, and the sign remains the same.
As energy is added to a substance, the temperature remains constant. How may the substance be changing?a. From a gas to a solidb. From a liquid to a gasc. From a liquid to a solidd. In the amount of kinetic energy
Which of the following processes is exothermic?a. Ether evaporatingb. Ice meltingc. Steam condensingd. Water decomposing
Which statement correctly describes an endothermic chemical reaction?a. The products have higher potential energy than the reactants, and the ∆H is negative.b. The products have higher potential energy than the reactants, and the ∆H is positive.c. The products have lower potential energy than the reactants, and the ∆H is negative.d. The products have lower potential energy than the reactants, and the ∆H is positive.

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Which statement is true for the combustion of ethanol?C2H5OH (l) + 3O2(g) → 2CO2 (g) + 3H2O(l) ∆H = -1370 kJa. The enthalpy change would be the same is gaseous water were produced.b. The potential energy of the products is less than the potential energy of the reactants.c. The products of the reaction occupy a larger volume than the reactants.d. The reaction is endothermic.
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Physics: Principles and ProblemsElliott, Haase, Harper, Herzog, Margaret Zorn, Nelson, Schuler, Zitzewitz
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