Answers ChemistryThermochemical Equations

Thermochemical Equations — Quiz Answers

5 verified answers1 views

Which graph represents an exothermic reaction?

Image with description A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts halfway up the vertical axis and runs parallel to the horizontal axis for a short distance. The line then peaks and returns to the same level as A plus B and continues parallel to the horizontal axis; this segment is labeled C.

Image with description A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts low on the vertical axis and runs parallel to the horizontal axis for a short distance. The line then rises sharply and levels off; this level section is labeled C. A double-headed arrow extends from the level of A plus B to that of C.

Image with description A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line segment labeled A plus B starts low and runs parallel to the horizontal axis. The line then curves up sharply, peaks, and falls a short distance to run parallel to the horizontal axis; the final segment is labeled C. A double-headed arrow extends from A plus B to C.

Image with description A graph has Reaction progression on the horizontal axis and energy on the vertical axis. A line starts about halfway up the vertical axis and travels a short distance parallel to the horizontal axis; this segment is A plus B. The line then curves up sharply, peaks, and falls sharply to run parallel to and near the horizontal axis; the final segment is C. A double-headed arrow extends from A plus B to C.

Free Preview

How is enthalpy used to predict whether a reaction is endothermic or exothermic?

When the enthalpy change of the reaction is positive, the reaction is exothermic.

When the enthalpy change of the reaction is positive, the reaction is endothermic.

When the enthalpy of the products is higher than the enthalpy of the reactants, the reaction is exothermic.

When the enthalpy of the reactants is higher than the enthalpy of the products, the reaction is endothermic.

Which statement is true if the Δ⁢H_rxn of a reaction is positive?

There is more reactant than product.

There is more product than reactant.

The reaction is exothermic.

The reaction is endothermic.

Which statement is true for most chemical reactions?

The internal energy of the system increases during a reaction.

An energy change occurs during the breaking and forming of bonds.

Energy is released during the formation of reactants.

The enthalpy of the products is higher than the enthalpy of the reactants.

The Δ⁢H_rxn of formation of carbon dioxide is negative. Which statement is true?

The amount of carbon dioxide is less than the amount of reactants.

The reaction is endothermic.

The reaction is exothermic.

The amount of carbon dioxide is more than the amount of reactants.

Did you find these answers helpful?

Thermochemical Equations — Quiz Answers

More from this Course

TRY EDGENUITY HACKS