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Chemistry

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Doris Carter

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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 is the latent heat of fusion

It is the amount of heat that is required to melt something, and the amount of heat that it gives off when it freezes. (They are the same amount.)

Why does temperature stay constant during a phase change

To put it in simple terms, all of the energy that would normally increase the temperature of the object, is being used to convert the object from one phase to another.

Once the object has completely changed to the new phase, the energy is not needed for phase change and raises the temperature of the object.

Because energy is being used to overcome intermolecular forces(apex)

How much energy is required to raise the temperature of 3 kg of iron from 20C to 25C

1935 J

What does a positive H look like on a potential energy diagram

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

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 does entropy change in gas reactions

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

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

What phase has the lowest entropy

solid-apex

What is heat included in the equation of an endothermic reaction

The heat in an endothermic reaction is included as a reactant on the left side of the equation, and has a positive value.

What equation shows how rate depends on concentrations of reactions

The equation is called the rate law equation. For the reaction aA+bB =>cC+dD the rate law would be rate = k[A]^m[B]^n where k is the rate constant and m and n are the "order" with respect to each reactant. m and n must be determined experimentally and may or may not be the same as the coefficients a and b.

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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