Chemistry - Cells (+fuel cells) and Batteries

What is an electrolyte?
Solution that can conduct electricity
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If two different __ were placed in electrolyte, we can produce electricity
Metals
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Why do cells only produce electricity for certain period of time?
Chemical in cell runs out and reaction stops
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Cells only produce electricity if we use metals with different...
Reactivities
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The smaller the reactivity, the smaller the potential difference produced by the cell. Is the potential difference big or small in reaction with zinc and tin?
Small potential difference / reactivity (close to each other in reactivity series)
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What about between Copper and magnesium?
Large potential difference
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The ___ also effects the potential difference
Electrolyte
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A battery contain two/more __ connected in __ to produce a greater voltage
Cells connected in series
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In an alkaline battery, reactants run out meaning...
No more electricity can be produced
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These reactions cannot be ___ so these are non chargeable batteries
Reversed
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When the reaction is reversible it means...
Battery can be recharged
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How would we reverse the reaction?
Apply electrical current
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In a fuel cell we react a fuel (e.g. hydrogen) with...
Pure oxygen/air
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Chemical reaction takes place inside fuel cell producing an...
Electric current
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For a hydrogen fuel cell the only waste product is...
Water
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In a fuel cell, hydrogen (H2) uses energy from a ___ to break apart into 2 protons and 2 electrons
Catalysts
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Why does this happen?
Hydrogen needs to get from the anode to cathode to combine with O2, but is too big to pass through electrolyte
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The __ can then fit passed the electrolyte to where the oxygen is
Protons
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The electrons have to go around the electrolyte (along a wire) because...
They're too big to go through it
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The protons and electrons then...
Reform into the H2 again
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Electricity is formed by the movement of the ___ along a wire
Electrons
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The hydrogen can now combine with oxygen to form...
H2O (water)
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To summerise, fuel cells produce ___ and use movement of ___ from anode to cathode to generate
Produce water. Movement of electrons. Generate electricity
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Other cards in this set

Card 2

Front

If two different __ were placed in electrolyte, we can produce electricity

Back

Metals

Card 3

Front

Why do cells only produce electricity for certain period of time?

Back

Preview of the front of card 3

Card 4

Front

Cells only produce electricity if we use metals with different...

Back

Preview of the front of card 4

Card 5

Front

The smaller the reactivity, the smaller the potential difference produced by the cell. Is the potential difference big or small in reaction with zinc and tin?

Back

Preview of the front of card 5
View more cards

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