Answers SY2026-27 - 2003340 Chemistry 1 Sem 2 CRLab: Enthalpy

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Consider the intermediate chemical reactions.The final overall chemical equation is . When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

is halved and has its sign changed.

is halved.

has its sign changed.

is unchanged.

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If a chemical reaction is reversed, what happens to the enthalpy of the reaction?

The enthalpy of the reaction becomes zero.

The enthalpy of the reaction doubles.

The sign of the enthalpy of the reaction reverses.

The enthalpy of the reaction is halved.

A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?Use .

8.46 kJ

16.1 kJ

27.7 kJ

47.8 kJ

When an object falls toward the ground due to gravity, what type of energy becomes kinetic energy?

chemical

electromagnetic

potential

thermal

What is the final chemical equation from the following intermediate chemical equations?

Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).

Upper P subscript 4 upper O subscript 6 (s) plus 8 upper O subscript 2 (g) right arrow 2 upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).

Upper P subscript 4 upper O subscript 6 (s) plus 15 upper O subscript 2 (g) right arrow upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).

Upper P subscript 4 upper O subscript 6 (s) StartFraction 5 over 3 EndFraction upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).

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