Electrochemistry A - level Chemistry ,./ ,./ ,./ ,./
Why must a high resistance voltmeter used in
,./ ,./ ,./ ,./ ,./ ,./ ,./
electrochemical cells to measure the potential difference? - ,./ ,./ ,./ ,./ ,./ ,./ ,./
correct answer ✔ ✔
,./ ,./ ,./
The voltmeter needs to be of very high resistance to stop the
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
current from flowing in the circuit. In this state it is possible
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
to measure the maximum possible potential difference (E).
,./ ,./ ,./ ,./ ,./ ,./ ,./
The reactions will not be occurring because the high
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
resistance voltmeter stops the current from flowing.
,./ ,./ ,./ ,./ ,./ ,./
Oxidising agent - correct answer ✔ ✔ ,./ ,./ ,./ ,./ ,./
Accepts electrons and gets reduced. ,./ ,./ ,./ ,./
Reducing agent - correct answer ✔ ✔ ,./ ,./ ,./ ,./ ,./
Donates electrons and becomes oxidized. ,./ ,./ ,./ ,./
Disproportionation - correct answer ✔ ✔ ,./ ,./ ,./ ,./
A redox reaction in which the same species is both oxidized
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
and reduced.,./
, Why do electrochemical cells require a salt bridge? -
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
correct answer ✔ ✔
,./ ,./ ,./
The salt bridge allows ions to flow between the solutions to
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
complete the circuit, keeping the balance of positive and
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
negative ions in each half cell without them mixing together.
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
The salt bridge is often a piece of filter paper or agar gel
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
soaked in potassium nitrate which is will not react with either
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
of the solutions in the half cells).
,./ ,./ ,./ ,./ ,./ ,./
What is electromotive force? - correct answer ✔ ✔
,./ ,./ ,./ ,./ ,./ ,./ ,./
There is a potential difference between the two electrodes. If
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
there was a bulb in the circuit instead of a high resistance
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
voltmeter a current would flow as because of the potential
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
difference chemical energy is converted to electrical energy.
,./ ,./ ,./ ,./ ,./ ,./ ,./
The voltmeter takes measurements when there is zero-current
,./ ,./ ,./ ,./ ,./ ,./ ,./
which means the measurements is the maximum possible
,./ ,./ ,./ ,./ ,./ ,./ ,./
potential difference between the two half cells and this is
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
called the e.m.f. ,./ ,./
Why must a high resistance voltmeter used in
,./ ,./ ,./ ,./ ,./ ,./ ,./
electrochemical cells to measure the potential difference? - ,./ ,./ ,./ ,./ ,./ ,./ ,./
correct answer ✔ ✔
,./ ,./ ,./
The voltmeter needs to be of very high resistance to stop the
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
current from flowing in the circuit. In this state it is possible
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
to measure the maximum possible potential difference (E).
,./ ,./ ,./ ,./ ,./ ,./ ,./
The reactions will not be occurring because the high
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
resistance voltmeter stops the current from flowing.
,./ ,./ ,./ ,./ ,./ ,./
Oxidising agent - correct answer ✔ ✔ ,./ ,./ ,./ ,./ ,./
Accepts electrons and gets reduced. ,./ ,./ ,./ ,./
Reducing agent - correct answer ✔ ✔ ,./ ,./ ,./ ,./ ,./
Donates electrons and becomes oxidized. ,./ ,./ ,./ ,./
Disproportionation - correct answer ✔ ✔ ,./ ,./ ,./ ,./
A redox reaction in which the same species is both oxidized
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
and reduced.,./
, Why do electrochemical cells require a salt bridge? -
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
correct answer ✔ ✔
,./ ,./ ,./
The salt bridge allows ions to flow between the solutions to
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
complete the circuit, keeping the balance of positive and
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
negative ions in each half cell without them mixing together.
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
The salt bridge is often a piece of filter paper or agar gel
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
soaked in potassium nitrate which is will not react with either
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
of the solutions in the half cells).
,./ ,./ ,./ ,./ ,./ ,./
What is electromotive force? - correct answer ✔ ✔
,./ ,./ ,./ ,./ ,./ ,./ ,./
There is a potential difference between the two electrodes. If
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
there was a bulb in the circuit instead of a high resistance
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
voltmeter a current would flow as because of the potential
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
difference chemical energy is converted to electrical energy.
,./ ,./ ,./ ,./ ,./ ,./ ,./
The voltmeter takes measurements when there is zero-current
,./ ,./ ,./ ,./ ,./ ,./ ,./
which means the measurements is the maximum possible
,./ ,./ ,./ ,./ ,./ ,./ ,./
potential difference between the two half cells and this is
,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./ ,./
called the e.m.f. ,./ ,./
