ELECTROLYSIS Decomposition using an electric current.

Slides:

Advertisements

Similar presentations

Can you think of some uses for aluminium?

Advertisements

Electrolysis of solutions solutions can be electrolysed; gases are usually produced gases produced can be collected in test tubes; identified later by.

contents Electrolysis of molten compounds Electrolysis of solutions

Science PowerPoint: William Freddy Curle. Definitions Electrode n. 1. A solid electric conductor through which an electric current enters or leaves an.

We have learnt that ionic compounds conduct electricity when molten or aqueous. When an electric current passes through such compounds, the compounds.

PRESENTER MS FARZANA MEHBOOB Head of the Science department

Electric cells  a simple electric cell consists of two different metal electrodes placed in an electrolyte  metals high up in the reactivity series give.

Electrolysis Electrolysis breaks down ionic substances into simpler substances by using electricity!

ELECTROLYSIS OF AQUEOUS SOLUTIONS

6. Electrochemistry Candidates should be able to: (a)Describe and explain redox processes in terms of electron transfer and/or of changes in oxidation.

1 Negative Ions - Bromine Negative ions are attracted to the positive electrode. The positive electrode is called the anode. Negative ions are called anions.

Electrolysis project Electrode: Is an electrical conductor that is used to pass current through an electrolyte.

Chemistry 1011 Slot 51 Chemistry 1011 TOPIC Electrochemistry TEXT REFERENCE Masterton and Hurley Chapter 18.

C5. Electricity and chemistry

Electrolysis ‘splitting up compounds using electricity’

Chemicals of the Natural Environment. C5 Lesson 8.

Yr 10 Electrolysis project. Yr 10 Electrolysis project.

Name the main gases in air, give the formula of each one and state their relative proportions. Use ideas about bonding and forces between molecules to.

Do now! Can you read through the blast furnace equations?

Electrolysis. –A redox reaction that is made to occur by passing a direct electric current through an electrolyte Electrolyte –is a liquid that conducts.

Extraction of Aluminium I know how aluminium is extracted from its ore. L.O.

Write down the Reactivity Series from Potassium to Gold.

APPLICATIONS of REDOX REACTIONS. ELECTROPLATING Electroplating is the use of electrolysis to apply a thin layer of one metal over another.

Extraction of Aluminium Aluminium is extracted using electrolysis because it is too reactive to be extracted using carbon.

Explain the process of electrolysis and its uses

Electrolysis To revise electrolysis of molten compounds: aluminium oxide To revise electrolysis of aqueous solutions: brine and copper sulfate.

Splitting up ionic compounds (F) Molten compounds

Chapter 21.  Two types: ◦ Voltaic cell: electrons flow spontaneously ◦ Electrolytic cell: electrons are forced to flow.

Electrolysis Decide on the answer(s) then click and a rectangle will surround the correct answer(s).

METALS. Introducing metal extraction 1.First, substances other than the metal compound are removed (concentration). 2.Next, the metal itself is extracted.

Chemical effect of electric current How things work.

Electrolysis L.O: To be able to describe the uses and predict the products of electrolysis.

We have learnt that ionic compounds conduct electricity when molten or aqueous. When an electric current passes through such compounds, the compounds.

One plus, two plus, three plus, NO Three minus, two minus, one minus, NO.

Electrolysis – background

Making aluminium.

Electro Chemistry. Conductors pass electricity (metals and ionic compounds (melted or in solution)) Insulators do not pass electricity (Plastics, wood,

Electrolysis Noadswood Science, 2012.

Electrolytic Cells. Endothermic.Use electricity to force a nonspontaneous reaction to occur. Endothermic. Electrolytic cells can be identified by the.

Title: Lesson 6 Electrolytic Cells Learning Objectives: – Describe electrolytic cells – Identify at which electrode oxidation and reduction takes place.

Chapter 16.  the chemical principles, half-equations and overall equations of simple electrolytic cells; comparison of electrolytic cells using molten.

Extracting metals. Methods of extracting metals The Earth's crust contains metals and metal compounds such as gold, iron oxide and aluminium oxide, but.

Electrolytic Cells Section 9.2. Vocabulary Electrolysis: electrical energy used to bring about a non-spontaneous redox reaction Electrolyte: any substance.

Electrolysis  Section Electrolysis Occurs in an electrolytic cell Can be the molten salt, or ions in solution Cations are attracted to the cathode.

Conductors and non-conductors Conductors are materials that conduct electricity. Non-conductors or insulators are materials that do not conduct electricity.

Electrolysis. What is electrolysis? Electrolysis means “breaking up a compound with electricity” From the Greek Electro – electricity Lysis – breaking.

9.2 Electrochemical cells. Two types of electrochemical cells Voltaic cell Spontaneous Chemical  Electrical Uses activity differences between two metals.

definitions of terms uses of electrolysis learn to predict products of electrolysis –molten compounds –aqueous solutions construct ionic equations for.

AQA GCSE C2.7.  When an ionic substance is melted or dissolved in water (to make a solution) the ions become free to move.  Electrolysis can then be.

3.17 Uses of electrolysis Purification of copper:

Chapter 17.  Which metals were discovered earliest?  Gold, copper, silver = less reactive metals  Found “native” ie. as pure metal  More reactive.

The ionic compound is called an electrolyte.

Starter Under what conditions do ionic compounds conduct electricity?

Chemistry AS – Redox reactions

C3.4 – Electrolysis and cells

Impure copper is purified by electrolysis using the apparatus shown.

Electrolysis ??? Electrolysis is the break-down (decomposition) of a substance by electricity.

20/11/2018 nrt.

Make sure you revise the following:

Electrolytic processes EDEXCEL TOPIC 3: CHEMICAL CHANGES 2 Acids

extraction of metals extraction of aluminium -

An electrolytic cell uses electricity to do a chemical reaction.

Chemistry 4: Chemical Changes

Chemistry Chapter 4 – Chemical changes – reactivity series, reduction and oxidation Write the reactivity series in order from most reactive to the least.

Presentation transcript:

ELECTROLYSIS Decomposition using an electric current

Electrolysis Cell Battery – provides power to start reaction Wires – carry the current Electrodes – carry the electric current into the electrolyte, does not react Cathode – negative electrode, attracts positive ions Anode – positive electrode, attracts negative ions Electrolyte – molten ionic salt, is decomposed by the current

Electrolysis of molten lead bromide

Electrolysis of molten lead bromide Lead bromide = lead + bromine Fume cupboard – toxic bromine fumes Carbon electrodes Heated to melt salt – allows ions to move Silver beads of lead formed at the cathode (-) Orange fumes of bromine form at the anode (+)

Extraction of aluminium

Aluminium oxide = aluminium + oxygen Cryolite is added to reduce the melting point of aluminium oxide Carbon electrodes are used Aluminium metal is formed at the cathode Oxygen gas is formed at the anode Oxygen reacts with the carbon anode wearing it away, the anode has to be replaced

Purification of Copper

Impure copper is placed on the anode (+) Pure copper is placed on the cathode (-) Copper sulphate solution is the electrolyte No colour change occurs in the electrolyte