CHEM KINETICS FORMULAS

Question 1

ZERO ORDER

Slope of the line (m)

Answer 1

(𝑚) = 𝐶2 − 𝐶1 / 𝑡2 − 𝑡1

Question 2

ZERO ORDER

Rate constant (k)

Answer 2

(𝑘) = −(𝑚)

usual unit = mg/mL/hr
mg mL-1 hr-1

Question 3

ZERO ORDER formula

Answer 3

C = (-k)(t) + C₀

k = rate constant
t = time
C₀ = initial concentration

Question 4

ZERO ORDER

Half-life (t1/2)

Answer 4

𝑡1/2 = 0.50(𝐶₀) / 𝑘

Question 5

ZERO ORDER

Shelf-life (t90)

Answer 5

𝑡90 = 0.10(𝐶₀) / 𝑘

Question 6

FIRST ORDER

Slope of the line (m)

Answer 6

(𝑚) = ln𝐶2 − ln𝐶1 / 𝑡2 − 𝑡1

Question 7

FIRST ORDER

Rate constant (k)

Answer 7

(𝑘) = −(𝑚)

usual unit = hr-1

Question 7

FIRST ORDER

Half-life (t1/2)

Answer 7

𝑡1/2= 0.693 / 𝑘

Question 8

FIRST ORDER

Shelf-life (t90)

Answer 8

𝑡90 = 0.105 / 𝑘

Question 9

b (y intercept) is also the same with

Answer 9

C₀ = initial concentration

Question 10

ZERO ORDER

b (y intercept) / C₀

Answer 10

C₀ = C₂ + (𝑘)(𝑡₂)

Question 11

FIRST ORDER

b (y intercept) / lnC₀

Answer 11

lnC₀ = ln𝐶2 + (𝑘)(𝑡₂)