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Chemistry

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Reese McDermott

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Cards in this guide (12)
What is thermodynamics

the study of the movement of energy and heat.

or

Thermodynamics is the branch of physics concerned with the conversion of different energy forms.

•DeltaG (rxn) = DeltaG (pdts) - DeltaDG (rcts) •DeltaG°(rxn) = -R T ln K •

What does hess's law state

The Enthalpy of a reastion is the sum of the enthalpies of intermediate reactions

How is an endothermic reaction identified

It requires heat as a reactant.

What defines an exothermic reaction

A reaction that produces heat

What is true of the enthalpy value of an intermediate reaction

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

What is specific heat a measure of

The amount of energy it takes to change the temperature of a substance by a certain amount.

How much energy it takes to heat a substance ~APEX

How is the Hfusion used to calculate the energy required to vaporize a volume of liquid

Liters liquid 1000ml/1L g/ml mol/g Hfusion

What most determines the entropy of a solid

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

What does a negative change in entropy indicate

The system has become more ordered.

What does a negative H tell about a reaction

The reaction is exothermic.

A solid fuel designed for a rocket has air pocket inside what is the danger of this

The rocket might explode from the added pressure when the combustion reaction hits the air.

Which of the following is the best thermal insulator APEX

Air

(Explanation): water has a high specific heat capacity, but it can boil. stone (😂) also is a good thermal insulator, but it can get really hot. Metal is a very good thermal conductor, so it is definitely not that. Therefore, air is the best (its also really hard to boil).

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