697054
Description
Flashcards by bella.calonje, updated more than 1 year ago
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Created by bella.calonje
over 12 years ago
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| Question | Answer |
| what is oxidation | Oxidation is loss of electrons |
| what is reduction | reduction is gain of electrons |
| what are the exception of Oxygens usual oxidation state | H202 -1 and OF2 +2 |
| What are the exception of Hydrogens usual oxidation state | metal hydrides (NaH) -1 |
| What are the exceptions of Cl usual oxidation state | -1 when combined with O or F |
| Oxidation is an.... | increase in oxidiation number |
| reduction is when.... | there is a decrease in oxidation number |
| Name the reactivity series of metals (from strongest reducing agent to weakest) | Mg, Al, Zn, Fe, Pb, Cu, Ag |
| Halide reactivity series (from strongest oxidizing agent to weakest) | F, Cl, Br, I |
| what occurs at the anode ? | Oxidation |
| What occurs at the cathode? | Reduction |
| which way do electrons flow in a voltaic cell? | flow from the anode to the cathode |
| What is the purpose of a salt bridge? | It enables the negative charge to be carried in the opposite direction to that of the electrons- which neutralizes any build up of charge and maintains the potential difference |
| Define standard electrode potential | the standard electrode potential of a half cell is its electrode potential relative to a hydrogen half-cell measured under standard conditions |
| standard hydrogen electrode conditions | H2 gas at 298 and 100 kPa, platinum electrode, acid solution containing 1.0 mol dm -3 H+ |
| standard electrode potential conditions | concentrations of 1.0 mol dm-3 all gases with a pressure of 100 kPa all substances must be pure temp of 298K/25 c if the half cell does not contain metal then platinum electrode |
| In a voltaic cell which half cell is the cathode? | the half cell with the more positive electrode potential |
| In a voltaic cell which half-cell is the anode? | the half cell with the more negative cell potential |
| How to calculate Ecell? | E halfcell where reduction occurs - E half cell where oxidation occurs |
| Spontaneity of positive Ecell values | Spontaneous |
| Spontaneity of Ecell negative | Non-spontaneous as written- reverse reaction is spontaneous |
| electroplating features? | an electrolyte containing the metal ions which are to be deposited the cathode made of the object to be plated anode made of the same metal which will be coated |
| what factors affect the amount of product in electrolysis | the charge on the ion the current the duration of the electrolysis |
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