Exam I formulas

Question 1

Charles’ Law

Answer 1

V/T (initial) V/T (after)

• as temperature increases, volume increases
• direct relationship (linear graph)

Question 2

Boyle’s Law

Answer 2

PV (initial) = PV (after)

• as volume decreases, pressure increases
• inverse relationship (curve)

Question 3

Avogadro’s Law

Answer 3

V/n (initial) = V/n (after)

• as volume increases, moles increase
• direct relationship (linear graph)

Question 4

Ideal Gas Law

Answer 4

PV = nRT

Question 5

Density

Answer 5

p = (MW * P)/(RT)
number density: p = n/V
mass density: p = m/V

Question 6

molecular weight

Answer 6

MW = (pRT)/P

Question 7

Kinetic energy

Answer 7

E(k) = (3/2)RT = (1/2)mv^2

Question 8

Vrms

Answer 8

v(rms) = sqrt (3RT/M)

Question 9

Gay-Lusaac’s Law

Answer 9

P/T (before) = P/T (after)

direct relationship

Question 10

Difficult to do this law

Answer 10

nT = nT

Question 11

comparing velocities at the same temp

Answer 11

v1/v2 = sqrt M2/M1

Question 12

Van der Waals Law

Answer 12

(P+ an^2/v^2)(V-nb) = nRT