Chem

stuff to memorize

Rf value

distance travelled by solute/solvent front

speed of light (c)

fλ

(f = frequency, λ = wavelength)

energy in one electron

hf —> h(c/λ)

where h (plack’s constant = 6.626×10^-34)

percentage yield of a product

= (experimental yield/theoretical yield) x 100

n (no. of moles)

mass/molar mass

moles in a gas at STP

volume/22.4

moles in a gas at RTP

V/24

moles in a liquid

concentration × volume

atom economy

^{(mass of desired product}/_{mass of total reactants})×100

relative atomic mass

[Σ(mass of isotope * percentage abundance)]/100

how many subshells in an atom shell?

same as the shell number from the nucleus

shell no. n has n subshells

how many orbitals in a SHELL

n² orbitals in shell n

no. of orbitals in each subshell (s, p, d, f)

in odd number order

s: 1

p: 3

d: 5

f: 7

how many electrons in each orbital

2

exceptions to the normal elextronic configuration?

copper (Cu) and chromium (Cr)

alkane formula

C_ⁿH_²ⁿ⁺²

alkene

C_nH_2n

alkyne formula

C_nH_2n-2

boyle’s law

P₁V₁ = P₂V₂

alcohol formula

C_nH_2n-1OH

how to remember alkane/ene/yne formulae?

alphabetical order, subtract two hydrogens from H_2n+2

charle’s law

V₁/T₁ = V₂/T₂

gay-lussac’s law

P₁/T₁ = P₂/T₂

avogadro’s law

V₁/n₁ = V₂/n₂

when P and T are constant