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Chemistry

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Emmanuel McKenzie

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Cards in this guide (16)
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

Which is true of the enthalpy of a reaction

Its value does not depend on which reactions are added.

What happens to the entropy in the reaction I2s I2g

Entropy increases in the reaction.

What is the entropy of a solid based on

The arrangement of the atoms

What most determines the entropy of a solid

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

How does entropy change in gas reactions

Reactions that increase the moles of gas will increase in entropy.

How is Hess's law applied in calculating enthalpy

All the reactions in a path are added together.

What happens when a glass of water is set in the sun until the water evaporates

Entropy increases.

What would cause entropy to decrease in a reaction

The products becoming more ordered than the reactants

How does the H reaction relate to the Hf of molecules involved in a reaction

Hreaction = Hf products - Hf reactants

What factors generally determine whether a reaction happens or not

Enthalpy and entropy.

Which of the following has the highest entropy Water Ice Water solution or Water vapor

water vapor

Which is a statement of the second law of thermodynamics

Entropy tends to increase in a system.

What describes the entropy change as a solution is made from a liquid to a solid

S > 0

What statements about airplane and rocket flight is true

Only one requires air molecules to generate lift.

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