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Chemistry

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Reese Lebsack

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Cards in this guide (19)
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 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.

How does entropy change in gas reactions

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

What could make G become negative at a given enthalpy and entropy

Changing the temperature

What determines how fast a reaction happens

Kinetics

What would happen to the rate of a reaction with rate law kNO2H2 if the concentration of NO were doubled

the rate would be four times larger. apex

How much energy is generated from freezing 2.5 g water

2.5 g 1 mol/18.02 g (-285.83) kJ/mol

What describes the difference between the mechanics of airplane flight and rocket flight

The difference is that you are a mamaguevo y yo se lo meto a tu hermana.

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.

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 the H fusion used to calculate the energy released when a mass of liquid freezes

grams liquid x mol/g x H fusion

What temperature is the reaction at equilibrium

The temperature will depend on the reaction that is under consideration.

How is temperature affect the spontaneity of a reaction with positive H and S

∆G = ∆H - T∆S and ∆G has to be negative for the reaction to be spontaneous. So, ultimately the effect of temperature will depend on the value of ∆H. If ∆H is negative, and ∆S is positive, then temperature won't matter, and reaction will be spontaneous. If ∆H is positive, and ∆S is positive, then a high temperature will favor spontaneity. If ∆H is negative and ∆S is negative, then a low temperature will favor spontaneity. So, the answer to your question is the higher the temperature the more likely the reaction will occur spontaneously.

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

Intermediate equations with known enthalpies are added together

The size of a rocket's cargo determines the amount of thrust the engine must create to carry the rocket into outer space. What is another term for this cargo

Payload (apex)

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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