Post on 26-Mar-2015
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Elements of the sea
What do we think about with the title elements of the sea?
Remember we’re in chemistry
Atoms and Ions
Ions in solution
Group 7
Manufacturing
Dipoles
Bonding
Halogenoalkanes
Elements of the sea
Ionic Formulae
Content
Process
Benefit
• Ionic solids• Concentrations in solution• Precipitation reaction
• Demo an reaction• Calculations
• Understand how particles interact
What is an ion?• A charged particle
• If positive they are called ?• How do they become positive?• If negative they are called?• How do they become negative?• Draw an ionic structure (label it)• How are they held together?
What is an ion?• A charged particle
• If positive they are called ? Cation• How do they become positive? Lose an e-• If negative they are called? Anion• How do they become negative? Gain an e-• Draw an ionic structure (ionic lattice)• How are they held together?
Electrostatic forces
Ionic Lattice
Ions in solution
Precipitation reaction
• Creating a solid • Ions that are not involved in the reaction
(spectator ion) can be removed• Summarise into ......
• Ionic equation – state symbols important!• Ionic precipitation
Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq)
AgCl(s) + Na+(aq) + NO3-(aq)
Ag+(aq) + Cl-(aq)
AgCl(s)
Precipitation reaction• Rules for ionic precipitation (learn)
• All nitrates are soluble
• All chlorides; except AgCl and PbCl2
• Most sulfates are soluable except for BaSO4, PbSO4 and SrSO4
• All Na/K/NH4+ salts are soluble
• All carbonates are insoluble (except NH4+ + gp 1 elements)
• Ions that are not involved in the reaction (spectator ion)• Summarise into ......
• Ionic equation – state symbols important!• Ionic precipitation
Solution Concentration• Concentration = Conc. (gdm-3)
(moldm-3) molar mass ( gmol-1)
• No. of moles = Conc. (moldm-3) x Vol (dm-
3)
n
c v
n= moles (mol)c= conc. (moldm-3)V= vol (dm-3)
1000 cm3=1dm3
Chemical Ideas 1.5• Concentration = Conc. (gdm-3)
(moldm-3) molar mass ( gmol-1)
• No. of moles = Conc. (moldm-3) x Vol (dm-
3)
n
c v
n= moles (mol)c= conc. (moldm-3)V= vol (dm-3)
1000 cm3=1dm3
Try this – table vs tableNaOH - which goes
where?
Make up your own card sort of a compound – with at least 3 concentrations/volumes/moles
Exam question
Make up your own card sort of a compound – with at least 3 different concentrations/volumes + moles
Best Choice – Salters A level / ES Formula, equations, amount / Concentration
Finish CI1.5CI5.1
CS ES1