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Chemistry

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Corbin Jast

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Cards in this guide (14)
What is thermal energy

The total kinetic energy of the particles in a system

What does entropy measure

Entropy is the inclination for things to increase their level of disorder.

eg. If you buy a puzzle in a box and you shake it really hard the pieces become more disorganized, near fall back into their proper place.

APEX ANSWER: Entropy measures the disorder in a system

What does the enthalpy of reaction measure

The amount of energy that is used or released as heat in a reaction.

Which of the following reactions shows that the formation of SO2 releases 296.8 kJ mol

S(s) + O2(g) SO2(g) + 296.8 kJ

What is true of the enthalpy value of an intermediate reaction

It is multiplied by 2 if the intermediate reaction is multiplied by 2

Which of the following describes the entropy change of a gas reaction

If there is an increase in the number of gas molecules, then S > 0.

What most determines the entropy of a solid

The crystalline structure of the solid most determine the entropy of a solid.

How is the H fusion used to calculate the mass of solid that 1kJ of energy will melt

1kj x 1/H fusion x g/mol solid

What does the enthaply of reaction measure

The enthalpy of reaction is the change of the system enthalpy after a chemical reaction.

If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of reaction you use for this in

1410 kJ

How is Hess's law used to measure enthalpy of desired reaction

Intermediate equations with known enthalpies are added together

Would form a spontaneous reaction at 298k

Not B

What does the second law of thermodynamics say apex

The entropy of the universe is increasing

What describes the study of how energy is transferred to different locations and forms

Force

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