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Chemistry

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Horace Hill

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Cards in this guide (17)
What is Gibbs Free energy

The usable energy released or absorbed by a reaction.

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.

What kind of changes contribute to spontaneity

An increase in entropy.

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.

What does a negative H tell about a reaction

The reaction is exothermic.

What form a spontaneous reaction at 298 K

H = 28 kJ/mol, S = 0.109 kJ/(molK)

What is the value for G at 300 K if H 27 kJmol and S 0.09 kJmolK

G = 0 kJ/mol

What is the name of the field of study with laws that describe how energy is transferred to different locations and forms

Thermodynamics

Which is a statement of the second law of thermodynamics

Entropy tends to increase in a system.

What statement describes the potential energy diagram of an exothermic reaction

The potential energy of the reactants is greater than the potential energy of the products.

What is the main factor in determining the amount of thrust a rocket requires to leave the earths atmosphere

Payload weight

What statements about airplane and rocket flight is true

Only one requires air molecules to generate lift.

A rocket uses an engine that creates thrust through the combustion of a liquid fuel and an oxidizer. What kind of rocket is this

Chemical rocket


What statement describes a reaction at 298 K if H 31 kJmol S 0.093 kJ(molK)

It is not spontaneous.

Would form a spontaneous reaction at 298k

Not B

An aerospace engineer is designing a rocket to have three stages. Which is not a reasonable explanation for this decision

to simplify the design of the rocket.

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