Electrolysis First Lesson

8/2/2019 Electrolysis First Lesson

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Today

Re capping the work

so far

Starting a C grade

topic
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Have you all got ..

A level ladder sheet in the front ofbooks

A year 11 explained leaflet

A green sheet stuck on the front ofyour books

Homework task sheet


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Look at the homework sheet

Draw and explain the structure ofHydrogen chloride . Why does this gashave a very low boiling point?

Must be done by

Thursday 5thNovember


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I understand.

I know about. I think I am grade A

at ..

The one thing Ireally enjoyedlearning about was.

I really enjoyed.


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Electrolysis is splitting upsubstances using

electricity

(Lysis is latin for splitting)


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What is electrolysis?

Electric current is used tobreakdown a substance made

up of ions

An electrolyte is the name forthe substance being broken

down


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Electrolysis set up

Cathode(-ve electrode)

Anode(+ve electrode)

Electrolyte: thisis what will beelectrolysed

d.c. powersupply


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Positive

Anode

Negative

Is

Cathode

Dont get stressed

in the exam:Remember PANIC


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Learning check in

Write down2 things you

have learntso far this

lesson


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Electrolysis of Molten NaCl

+ -

-+

CATHODEANODE

Na+

Cl-

Na+

Cl-

Na+

Cl-Na+

Cl-


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+ -

Zn+

Zn+Zn+

Zn+Zn+

Zn+

Zn+

Cl-

Cl-

Cl-

Cl-

Cl- Cl-

Cl-

Cl-

Zn+

positive electrode

(anode)

negative electrode(cathode)

molten zincchloride (ions free

to move)


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+ -

Zn+

Zn+

Zn+

Zn+

Cl-

Cl-

Cl-

Cl-

Cl-

Zn+

The negativelycharged

chloride ions

are attracted tothe positiveelectrode


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Compound Anode Cathode

SodiumBromide

PotassiumIodide

CalciumFluoride

MagnesiumOxide

LithiumChloride


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Anod

e

Catho

de

= bromide ion

= lead ion


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O.I.L.R.I.G.Oxidation is loss

of electrons

Reduction is gainof electrons


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Anod

e

Catho

de

= bromide ion

= lead ion

At the cathode:Pb+ gains electrons to form

lead metal.

It is REDUCED.

At the anode:Br- loses electrons to formbromine gas.

It is OXIDISED.


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Cathode

Negative

Anode

Positive

Positive ions

attracted

Negative ions

attracted

REDUCTIONhappens here (

positive ions gainelectrons)

OXIDATIONhappens here

(negative ionslose electrons


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Stand up sit down

1. One person names a topic.2. All pupils write a key word to do with the

topic on a whiteboard3. The person who chose the topic has 30

seconds to name as many key words to dowith the topic as they can.4. If the word the pupil has written down is

said they have to sit down.

5. The aim for the topic chooser is to geteveryone to sit down.6. The aim for the pupils writing down a word

is to out fox the topic chooser with arelevant but obscure word.
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Electrolysis First Lesson

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