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Title: Equations and Units Cheat Sheet for Level 2 Core Chemistry
Description: A cheat sheet of units and equations (basic) for Core Chemistry 2.2- Chemistry of Activated Systems and Radicals. Focuses on rate laws, Arrenhius, etc.
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Equations & Units Help Sheet
πΈπ‘Ž

Using Arrhenius for comparing rate constants: The Arrhenius equation is 𝐴𝑒 βˆ’π‘…π‘‡
...
Then use π‘˜π‘Ÿ(π‘’π‘›π‘π‘Žπ‘‘π‘Žπ‘™π‘¦π‘ π‘’π‘‘) to get a value which
can be used to compare the catalysed and uncatalysed reaction
...

π‘˜1

Working out turnover number (kcat): To work out the turnover number, use the equation
Working out catalytic efficiency (Ξ·): To work out catalytic efficiency, use the equation

π‘‰π‘šπ‘Žπ‘₯

...

π‘˜π‘€

Units:
β€’

Km= The units of Km are going to be the same as your [S] units e
...
mol dm-3 etc
...

What about the slope? The slope is

π‘˜π‘€

...

𝑀

What does the M-M rate law look like? π‘Ÿπ‘Žπ‘‘π‘’ =

π‘‰π‘šπ‘Žπ‘₯[𝑆]

...

[𝑆]

To work out Km when given Vmax, rate, and [S], then use π‘˜π‘€ =
π‘˜ 𝑣

𝑀

...


Enzyme inhibition:
β€’

If Vmax is constant and km increases, then it is competitive inhibition
...
To calculate ki for competitive inhibition, use π‘˜π‘– =
π‘˜π‘€ [𝐼]


...
This means the
y-intercept increases and the slope is constant
...


If Vmax decreases and Km is unchanged then it is non-competitive/mixed inhibition
...
To calculate ki, the use π‘˜π‘– = (π‘‰π‘šπ‘Žπ‘₯βˆ’π‘‰π‘šπ‘Žπ‘₯,π‘Žπ‘π‘)
...
Calculate the energy emitted from the light source by using 𝐸 = 𝑃𝑑
...
Then calculate how much of this energy is actually absorbed by the substance by using
πΈπ‘Žπ‘π‘  = 𝐸 Γ— %π‘Žπ‘π‘ π‘œπ‘Ÿπ‘π‘’π‘‘
...
Then you’ll need to calculate the energy of one of those photons at the specified wavelength
by using 𝐸 =

β„Žπ‘

...
Next you’ll need to calculate the number of photons that were absorbed by using π‘π‘Žπ‘π‘  =
πΈπ‘Žπ‘π‘ 

...
Next you’ll calculate the number of mols decomposed of the absorbing species by using
π‘π‘‘π‘’π‘π‘œπ‘šπ‘π‘œπ‘ π‘’π‘‘ = (π‘Žπ‘šπ‘œπ‘’π‘›π‘‘ π‘‘π‘’π‘π‘œπ‘šπ‘π‘œπ‘ π‘’π‘‘) Γ— (𝑁𝐴 )
...
Lastly, to work out overall quantum yield, use πœ™ =

π‘π‘‘π‘’π‘π‘œπ‘šπ‘π‘œπ‘ π‘’π‘‘
Title: Equations and Units Cheat Sheet for Level 2 Core Chemistry
Description: A cheat sheet of units and equations (basic) for Core Chemistry 2.2- Chemistry of Activated Systems and Radicals. Focuses on rate laws, Arrenhius, etc.
Buy These NotesPreview