Chemistry Exam 2

1 atm in mm of Hg

760 mm Hg

Measuring pressure in a manometer

P_gas=P_h+P_atm where Pgas is the pressure of the gas, Ph is the height of the fluid column, and Patm is the atmospheric pressure. Patm is only considered in an open system

Combined gas laws

P₁V₁/n₁T₁=P₂V₂/n₂T₂

What is STP

Standard temperature and pressure

Molecular speed

v=squrt((3RT)/M)

Comparing speeds and molar masses and rates

r₁/r₂=v₁/v₂=squrt(M₂/M₁)

Formula for kinetic energy

1/2mv²

Types of potential energy

Chemical and electrostatic

Exothermic

heat is released

endothermic

heat is absorbed

Conversition of energy formula

E=q+w where q is heat and w is work

Equation for work related to pressure and volume

w=-P(change in V)

Equation for change in heat

change in heat=(change in energy)+P(change in volume)

Equation for specific heat ( c)

q=mc(change in temperature) where q is heat, m is mass, and c is specfic heat

Equation for heat capacity (C)

q=C(change in temperature)

Phase change liquid to gas

vaporization

Phase change solid to liquid

melt (fusion)

Phase change solid to gas

sublimation

Phase change gas to liquid

condensation

Phase change liquid to solid

freezing

Phase change gas to solid

deposition

Equation for the heat of a phase change

q=n(change in temperature)

Boiling point and melting point of water

Boiling point (100 degrees C) Melting point (0 degrees C)

What are substances in standard state

The substance is in its natural form and does not contribut to change in heat

Speed of a wave (speed of light)

u=wf where u is speed, w is wavelength, and f is frequency also speed of light

Equation for energy base of waves

E=hf where h is planks constant

Equation of energy of lines in spectra

E=R_h((1/n_i²)-(1/n_f²)) where R_h is a constant and n is orbit occupied

What happens as n values increase in emission series

the energy change gets smaller

What is a node

the point where the amplitude of a wave is zero