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Mapa Mental por Omar Amura, actualizado hace más de 1 año
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Creado por Omar Amura
hace más de 11 años
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Chemistry Unit 1
- Formulae, Equations and Amount of
Substance ALWAYS LOOK AT THE
SYMBOL GIVEN (g OR dm³, etc.)
- Empirical Formula:
%/ram = x for each
element, x/smallest
value, then ajust
- Ionic Equations: Write
out full molecular
formula, balance,
separate into ions, look
if soluble or not, then
cancel spectator ions
and re-write
- Moles = mass/molar mass
OR n=m/Mr
- For Gases: moles= volume(dm³)/Molar
volume(24) OR n= v/Mv (24dm³molˉ¹)
- 4 Solutions:
moles=concentration(moldmˉ³)Xvolume(dm³)
OR n=cv REARRAGE: c(moldm³)=n/v
WATCH OUT 4 CONVERTIONS
cm³->dm³ 1cm³->0.001dm³ 1dm³->1000g
- For Gases: moles= volume(dm³)/Molar
volume(24) OR n= v/Mv (24dm³molˉ¹)
- Calculations based on reactions
- To get Mass B from Mass A:
mass A -> moles A -> moles B ->
mass B
- Moles A -> Moles B: moles A x ratio B/A
- Moles A -> Moles B: moles A x ratio B/A
- To get Mass B from Mass A:
mass A -> moles A -> moles B ->
mass B
- Calculation of No. of Particles: No.
molecules = Moles x Avogadro
=>no. MOLECULES=nx6.02x10²³
=>no. IONS=no.molecules x No. of
ions in the formula
- Concentration of Solutions:
- amount of solute(moles)/volume(dm³) = moldmˉ³
- amount of solute (grams)/volume(dm³) = gdmˉ³
- [amount of solute (grams) / amount of solution
{solute + solvent} (grams)x10^6] x 10^6/10^6=ppm
TRY N WORK IT OUT SYSTEMATICALLY! USE X IF
NEED BE!
Nota:
- video with explaining ppm in greater depth: http://www.youtube.com/watch?v=d6MxhXPmyes
- amount of solute(moles)/volume(dm³) = moldmˉ³
- Gas Volume Calculations
- To get Volume B from Mass A:
mass A -> moles A -> moles of gas
B -> volume of GAS B
- Moles A -> Moles B: moles A x ratio B/A
- Moles of gas B -> Volume of GAS B: moles B x molar volume
- Moles of gas B -> Volume of GAS B: moles B x molar volume
- Moles A -> Moles B: moles A x ratio B/A
- Calculations for GASES
ONLY: ratio B/A x mass A =
volume of GAS B
Nota:
- For Calculations involving gases only, you can skip using the molar mass or volume because you divide and then multiply the same number. So: ratio B/A x Mass A = volume of gas Bis all the working that is needed!
- To get Volume B from Mass A:
mass A -> moles A -> moles of gas
B -> volume of GAS B
- Percentage yield (%) = (actual yield/theoretical yield) x 100
- Atom economy = (Mr of product
[that you want!!] x No. of
formulae of it in the equation x 100)
/ sum of Mr of all reactants
- Empirical Formula:
%/ram = x for each
element, x/smallest
value, then ajust
- Introduction to Organic Chemistry
- Atomic Structure and The Periodic Table
- Energetics
- Exothermic reaction = bond breaking ∴ loses
heat energy to surroundings ∴ change in
enthalpy is negative (-ΔH)
- Endothermic reaction = bond making ∴ gains
heat energy from surroundings ∴ change in
enthalpy is positive (+ΔH)
- The activation energy
is the energy required
by certain chemicals to
undergo a reaction
- E=mcΔT
Nota:
- E=mcΔT E- Energy transfered m- mass c- specific heat capacity ΔT- change in temperature (Specific Heat Capacity- The energy in joules (j) needed to raise the temperature of 1Kg of a substance by 1 Kelvin)
- ENTHALPY OF REACTION: is when the molar quantities as written in the equation react under standard conditions (1atm pressure + a stated temp of 298K)
- ENTHALPY OF FORMATION: is the enthalpy change when 1 mole of a compound is formed from its elements under standard conditions
- ENTHALPY OF COMBUSTION: is the enthalpy change when 1 mol of a substance if burnt completely in oxygen under standard conditions
- ENTHALPY OF NEUTRALISATION: is the enthalpy change when an acid and base react to form 1 mol of water under standard conditions
- HESS'S LAW: Law which states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reacti
- Exothermic reaction = bond breaking ∴ loses
heat energy to surroundings ∴ change in
enthalpy is negative (-ΔH)
- Bonding
- Weak Points
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