Cells And Batteries Flashcards

1
Q

How do we create electricity ?

A

Placing two different metals into an electrolyte then we can produce electricity

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2
Q

What is an electrolyte ?

A

A solution that can conduct electricity for example a solution of an ionic compound

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3
Q

What do you connect to the two metals ?
What does this do ?

A

A volt meter
It allows for an electric current to flow through the wire

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4
Q

What can we use cells for ?

A

Generating electricity

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5
Q

How long can a cell produce electricity so what does this mean ?

A

They can only produce electricity for a certain period of time meaning the chemicals in the cell will run out and the reaction stops

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6
Q

What is the key point with cells in relation to the metals used which allows it to conduct electricity ?

A

The metals have to be different meaning they have different reactivities

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7
Q

What cell would you expect to produce a large voltage ?
A. magnesium and copper
B. Copper and zinc

A

Magnesium and copper
They have a large potential difference in reactivity therefore producing a higher voltage

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8
Q

What is the key fact with the reactivity of the metals used ?

A

The greater the difference between the reactivity of the metals, the greater the potential difference produce

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9
Q

What does the electrolyte affect ?

A

The potential difference

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10
Q

What are the four factors that affect the voltage?

A
  • Type of electrodes
  • type of electrolyte
  • temperature of electrolyte
  • concentration of electrolyte
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11
Q

What is a battery ?

A

Two or more cells connected in a series to produce a greater voltage

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12
Q

If two cells with an individual potential difference of 2.5 are combined, what is the voltage produced ?

A

5v
2.5x 2= 5

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13
Q

What is the rule with the electrolyte ?

A
  • It has to contain ions so an electrolyte of water will produce a voltage of 0 as there are no ions
  • A solution with an electrolyte of sodium chloride will produce a charge
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14
Q

What is the good way of remembering oxidation and reduction ?

A

OIL RIG
oxidation is loss of electrons
Reduction is the gaining of electrons

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15
Q

What are alkaline batteries ?

A

Non rechargeable cells and batteries
Here the chemical reaction stops when one of the reactants is used up so can only be used once

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16
Q

Why are alkali batteries non rechargeable ?

A

They are not reversible

17
Q

What are some examples of rechargeable batteries ?

A

Lithium ion batteries

18
Q

Why are lithium ion batteries rechargeable ?

A

Can be recharged because the chemical reaction is reversed when an external electrical current is supplied

19
Q

What will the more reactive electrode donate to the less reactive electrode ?

A

Electrons