Calculations Flashcards

1
Q

Speed of light =

A

wavelength x frequency

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2
Q

Energy of a photon =

A

planck constant x frequency

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3
Q

Percentage yield =

A

experimental yield / theoretical yield x100

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4
Q

Percentage uncertainty =

A

uncertainty / measured quantity x100

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5
Q

Moles (titre) =

A

concentration x volume

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6
Q

Moles (other) =

A

mass / Mr

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7
Q

Ideal Gas Equation =

A

pressure x volume = gas constant x temperature x number of moles

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8
Q

Q =

A

mass x specific heat capacity x change in temperature

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9
Q

Enthalpy change =

A

Q / mol

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10
Q

Kc =

A

products / reactants (to the power of moles)

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11
Q

Volume = (gas)

A

moles x 24

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12
Q

Density =

A

mass / volume

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13
Q

Atom economy =

A

formula mass of desired product / formula mass of all reactants x100

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14
Q

Rate of reaction =

A

change / time taken

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15
Q

Gradient =

A

y / x

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16
Q

Rate =

A

k [A] [B]^2

17
Q

Arrhenius equation =

A

Rate constant = collision frequency x e -(activation enthalpy/gas constant x temperature)

18
Q

lnk =

A

lnA -Ea/RT or -Ea/R x 1/T + lnA

19
Q

Half life =

A

t x 1/2

20
Q

E cell =

A

E° reduction - E° oxidation

21
Q

pH of a strong acid =

A

-log10[H+(aq)]

22
Q

pH of a weak acid =

A

Ka = [H+] [A-] / [HA]

23
Q

pH of a strong alkali =

A

Kw = [H+][OH-]

24
Q

pH of a buffer =

A

Ka = [H+] x [salt] / [acid]

25
Q

Ksp =

A

[product][product]

26
Q

Kpc =

A

component in stationary phase / component in mobile phase

27
Q

Entropy change =

A

total of products - total of reactants

28
Q

Total entropy change =

A

Change of surroundings (-enthalpy change / temperature) + change of system

29
Q

ΔH =

A

total bonds broken - total bonds made

30
Q

Volumes of gas (dm3) =

A

Moles x 24

31
Q

Volumes of gas (cm3)

A

Moles x 24000