Unit 5 - Formulae, Equations and Amounts of Substance (9CH0)
Summary
Summary - Unit 5 - Formulae, Equations and Amounts of Substance (9CH0)
8 views 0 purchase
Course
Unit 5 - Formulae, Equations and Amounts of Substance (9CH0)
Institution
PEARSON (PEARSON)
A summary of topic 5, organised so the notes are easy to understand. The notes are on slides, so they can be printed out and used as revision cards or posters, for revision on the go. The notes cross-reference the specification so it is easy to see where each bit of information has come from. They ...
Unit 5 - Formulae, Equations and Amounts of Substance (9CH0)
All documents for this subject (6)
Seller
Follow
laurelgracefell
Content preview
Naming Ionic eq’s:
- IDE = 2 elements 1. Balance
- ATE = 2 elements + oxygen 2. Everything aq split into ions
Common transition metal valencies: 3. Remove spectator ions
Percentage calculations:
% yield = actual yield _ x100
Empirical formula vs molecular formula: theoretical yield
Emp = relative number of atoms of each element present % atom economy = mass of atoms in desired product
Molec = actual number of atoms of each element present x100
To calc molec: mass of atoms in all reactants OR all products
1. Find emp formula % uncertainty = uncertainty of equipment x100
2. Find Mr of emp size of measurement
3. Mr given of molec formule / Mr of emp
4. Emp formula X number from 3. KEY DEFINITIONS
Important equations: Mole = is the amount of substance that contains the same
n = m/Mr number of particles as there are atoms in 12.0 g of carbon-12
n = particles/L L = 6.02 x 10^23 cm^3 →/10^3→dm^3 Molar mass (Mr) = mass of 1 mole of a substance in g/mol
n=cxv dm^3 →x10^3→cm^3
OR mass = c x v dm^3 →/10^3→m^3
Conc = moles/volume (mol/dm^3) mol/dm^3 →xMr→g/dm^3
Conc = mass/volume (g/dm^3) g/dm^3 →/Mr→mol/dm^3
Density = mass/volume (kg/m^3)
Moles = vol(dm^3)/24 or vol(cm^3)/24000
⤷ in gases, Ar = 4g/mol →4g takes up 24dm^3 of space
1 mole of gas takes up 24dm^3 of space at RTP
Ideal gas equation:
2 assumptions:
5. Ideal gas molecules don’t attracts or repel one another
6. Gas molecules themselves take up no volume
PV=nRT T = absolute temp (k)
⤷ kPa = dm^3 R = 8.314J/mol k
⤷ Pa = m^3 n = moles of gas
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller laurelgracefell. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.87. You're not tied to anything after your purchase.
