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Chemistry

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Jenifer Carter

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Cards in this guide (16)
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

Where do trees get carbon dioxide

Out of the air. There is a lot of carbon dioxide in the air. You exhale carbon dioxide, because your cells use oxygen and turn it into carbon dioxide.

Which of the following is a statement of Hess's law

The enthalpy of reaction does not depend on the steps taken in the reaction.(Apex)

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 does entropy change in gas reactions

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

Which of the following would most likely be spontaneous

A reaction that produces heat

What does the term spontaneous mean in chemical reactions

Occurring without added energy

What is S in the equation delta G equals delta H minus TdeltaS

S stands for entropy content.

How is the delta H fusion used to calculate volume of liquid

It is not. The density and mass would be used to find the volume.

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

S > 0

What is the purpose of the flame that is lit below a hot air ballon

That flame is the source of heat for the hot air in the hot air balloon.

What conditions make delta G always positive

Delta G is always positive when enthalpy increases and entropy decreases. APEX

What temperature would a reaction with H -220 kJmol and S -0.05 kJ(molK) be spontaneous

-219.95

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

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