Amount Of Substance
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What does one mole contain and what is this known as?
6.02x10^23 particles known as Avogadro’s number
Does it matter what the particular are?
No they can be atoms, molecules, electrons, ions, penguins, dinosaurs- anything
Number of particles=
Number of moles x Avogadro’s number
What is 1 mole of a substance mass equal to?
It’s relative molecular mass in grand
How can you work Mr?
Number of moles = Mass of substance/ Mr
What’s the concentration of a solution?
How many moles are dissolved per 1dm3 of solution units are mol dm^(-3)
Concentration equation
Number of moles= concentration (mol dm^(-3)) x volume dm^(-3)
1dm3=
1000cm3
To convert from cm3 to dm3?
divide by 1000
Ideal gas equation?
pV=nRT
How to convert to K
oC+ 273
Units for ideal gas equation
P= (pa) V= (m3) n= number of moles R=8.31 T= K
1cm3 is
1x10^(-6) m3
1dm3 is
1 x10^(-3) m3
Balanced equations have the same?
Number of atoms on both sides
How do you balance an equation rules?
Change number in front DON’T CHANGE NUMBER IN FORMULA
How to balance equation?
Work out number of atoms each side Change according Can use 1/2 at front Check it balances
What else can you write?
Ionic equation for any reaction involving ions happen in solution In ionic equation only reacting particles and products formed included Check charges balance
State symbols
S= solid L= liquid G= gas Aq= aqueous in water
Name two other things equation balancing can be used for?
Work out gas volumes Work out masses
What do you before titration?
Make up standard solution
Explain standard solutions
Any solution you know exact concentration Involved dissolving known amount of solid in known amount of water to create known concentration
How to make standard solution step 1?
Work out number of moles of x you need using Moles=c/v
How to make standard solution step 2?
Work out how many grams of x needed using formula Mass= moles x Mr