EQUATIONS

Question 1

equation for speed of light, wavelength and frequency

Answer 1

speed of light= wavelength (m) x frequency(s-1)

Question 2

speed of light constant

Answer 2

3.00 x10^8 ms-1

Question 3

equation for energy of a photon, planks constant and frequency

Answer 3

energy(J)=Planks constant(js) x frequency (s-1)

Question 4

planks constant

Answer 4

6.63x10^-34 (Js)

Question 5

moles, mass, mr

Answer 5

mass (g)= mr x n (mol)

Question 6

moles, concentration, volume

Answer 6

n(mol)= concentration (moldm-3) x volume (dm3)

Question 7

Avogadro’s number

Answer 7

6.02 x10^23

Question 8

ideal gas equation

Answer 8

Pv= NRT

Question 9

pv=NRT

Answer 9

p= pressure (Pa)
v=volume (m3)
n=(moles)
r=8.31441 (J K-1 mol-1).
t=temperature in K

Question 10

Kpa to Pa

Answer 10

times by 1000

Question 11

K to C (TEMP)

Answer 11

add 273

Question 12

1 m3 = ? dm3 = ? cm3

Answer 12

1 m3 = 1000 dm3 = 1 000 000 cm3

Question 13

equation for relative atomic mass

Answer 13

A r = ∑ (Isotopic mass × Abundance)

Question 14

moles, volume of gas at RTP

Answer 14

V = n \times 24

Question 15

Percentage yield

Answer 15

(actual yield/theoretical yield)/100

Question 16

atom economy

Answer 16

atom economy = (mass of desired product)/(total mass of products} (times 100 )

Question 17

enthalpy change from a temperature change

Answer 17

Q = mc Δ T

Question 18

Q = mc Δ T

Answer 18

Q=energy in J
M= mass in cm3
C=specific heat capacity (4.18) J g-1K-1
Δ T= temperature change in K

Question 19

enthalpy change=(-Q/1000)/n

Answer 19

Q=energy in J
n= moles

Question 20

Equilibrium substitutions

Answer 20

C and D is the products c and d is the moles
A and B are the products a and b are the moles

Question 21

rate of reaction