Chem exam tips
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Never forget what?
Units of k , Kc and
What has to be taken into account when working out enthalpy from Born-Haber cycles?
Multiplying by 2 if there are two of the species.
Always remember to do what with species like Ca(OH)2 when working out pH ?
Times the concentration of the species by 2 to find the OH- concentration.
What must always be done when explaining a buffer solution?
- Writing an equation to explain the equilibrium.
- eg .
- HOCH2COOH ⇌ H+ 2COO-
- H2CO3 ⇌ H+ + HCO3 -
When working out Kc what must always be done?
- Volumes converted into mol dm-3eg. 4.00 mol NO2 in a container with a volume of 2.00 dm3There moles are 2.00 mol dm-3
In half equations what must balance
What would you like to do?
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