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Chemistry

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Garnet Zemlak

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Cards in this guide (20)
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 specific heat capacity

specific heat capacity of a substance is defined as the QUANITY OF HEAT REQUIRED to raise the temperature of 1 Kg of the substance through 1K ( kelvin ) .

however it obtained the unit of J/kg/k

The specific heat capacity is the energy required to raise the temperature of 1 kg of material by 1 degree Celsius.

_____________________

Apex: The energy needed to change the temperature of a substance The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

What is the nuclear decay equation for an example of alpha decay

The equation for the alpha decay of 239Pu is: 94239Pu --> 92235U + 24He

where 24He represents the alpha particle, which is a Helium nucleus.

A cat with two kittens are sleeping or A cat with two kittens is sleeping.

'with two kittens' describe the cat. So, you should write 'is sleeping'. But if you mean that all three of them are sleeping, write 'A cat and his two kittens are sleeping'.

What does it mean for heat to be transferred by radiation

Energy is transferred when molecules absorb electromagnetic waves.

How does temperature affect the spontaneity of a reaction

if H and S have the same sign the temperature will determine spontaneity

What would cause entropy to increase in a reaction

The products becoming more spread out.

What does it mean for heat to be transferred by convection

Energy is transferred through moving currents of warmer air or liquid.

How does the ocean affect coastal climate

the specific heat keeps the ocean temperatures more even

What is the value for G at 100 K if H 27 kJ mol and S 0.09 kJ molK

G=18 kJ/mol

What would cause entropy to decrease in a reaction

The products becoming more ordered than the reactants

What does thermal energy refer to

The kinetic energy within a system

How can an unknown Hreaction be determined using Hess's law

Enthalpies from reaction steps are added to determine an unknown Hreaction

What information does Gibbs free energy give about a reaction

It tells if the reaction will process spontaneously or not

How is stoichiometry used to calculate energy released when a mass of liquid freezes

Grams liquid × mol/g × Hfusion

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 can be determined from the frequency and wavelength in a wave

the velocity of the wave -apex

What can be said about a reaction with triangle H 620 kJmol and triangle S -046 kJ(mol.K)

it is never spontaneous

What statement best describes the second law of thermodynamics

How energy changes or moves

What volume of water can be boiled by 3 kJ of energy

1.3 ml

(Apex's answer)

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