logging in or signing up Redox Reactions nandakumargoud Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 4682 Category: Education License: All Rights Reserved Like it (3) Dislike it (1) Added: January 02, 2009 This Presentation is Public Favorites: 0 Presentation Description about Comments Posting comment... By: Chemist2010 (10 month(s) ago) Very interesting, can i download it? Saving..... Post Reply Close Saving..... Edit Comment Close By: studentworld16 (17 month(s) ago) gooog abnfgdy Saving..... Post Reply Close Saving..... Edit Comment Close By: gode (19 month(s) ago) good Saving..... Post Reply Close Saving..... Edit Comment Close By: vishwas12 (19 month(s) ago) gud idia Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Redox Reactions. : Redox Reactions. Oxidation Reduction Visit www.worldofteaching.com For 100’s of free powerpoints This Powerpoint is hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number 4 Experiments: : 4 Experiments: Burning magnesium Copper in silver nitrate solution Chlorine solution and potassium iodide solution Exploding hydrogen Word equation Balanced symbol equation 2Mg(s) + O2(g) ? 2MgO(s) : 2Mg(s) + O2(g) ? 2MgO(s) Oxidised – gains oxygen Must be a redox! Mg ? Mg2+ O ? O2- Put the e- in. +2e- +2e- Oxidised – loss of e- Reduced – gain of e- Cu(s) + 2AgNO3(aq) ? Cu(NO3 )2(aq) + 2Ag(s) : Cu(s) + 2AgNO3(aq) ? Cu(NO3 )2(aq) + 2Ag(s) Ag+ ? Ag Cu ? Cu2+ Complete the half-equations +e- +2e- Oxidised? Reduced? Oxidised – loss of e- Reduced – gain of e- Try Question 1. : Try Question 1. H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number Oxidation Numbers : Oxidation Numbers The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O2. Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of C in CO2? ? – 4 = 0 ? = +4 Put the +! Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of Mg in MgCl2? +2 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of N in NH3? -3 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in SO42-? ? – 8 = -2 ? = +6 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in S2-? -2 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of N in NH4+? -3 Try Question 2. : Try Question 2. H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. +1 0 -2 0 O H H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) +1 0 -2 0 O H Oxidised? H – increase in oxidation number Reduced? O – decrease in oxidation number Try Question 3. : Try Question 3. Oxidation Numbers and names : Oxidation Numbers and names To avoid any confusion when an element can have several oxidation numbers, the oxidation number is usually mentioned in the compound’s name. In names like “elementate(X)”, the number refers to “element” and not the associated oxygens. So if we look at some examples , we get the following names:- KMnO4 potassium manganate(VII) NaClO3 sodium chlorate(V) POCl2F phosphorus(V) oxydichlorofluoride NaH2PO3 sodium dihydrogenphosphate(III) K2Cr2O7 potassium dichromate(VI) Check the numbers. Try any 3 in Question 7. : Try any 3 in Question 7. Slide 24: Well done! You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Redox Reactions nandakumargoud Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 4682 Category: Education License: All Rights Reserved Like it (3) Dislike it (1) Added: January 02, 2009 This Presentation is Public Favorites: 0 Presentation Description about Comments Posting comment... By: Chemist2010 (10 month(s) ago) Very interesting, can i download it? Saving..... Post Reply Close Saving..... Edit Comment Close By: studentworld16 (17 month(s) ago) gooog abnfgdy Saving..... Post Reply Close Saving..... Edit Comment Close By: gode (19 month(s) ago) good Saving..... Post Reply Close Saving..... Edit Comment Close By: vishwas12 (19 month(s) ago) gud idia Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Redox Reactions. : Redox Reactions. Oxidation Reduction Visit www.worldofteaching.com For 100’s of free powerpoints This Powerpoint is hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number 4 Experiments: : 4 Experiments: Burning magnesium Copper in silver nitrate solution Chlorine solution and potassium iodide solution Exploding hydrogen Word equation Balanced symbol equation 2Mg(s) + O2(g) ? 2MgO(s) : 2Mg(s) + O2(g) ? 2MgO(s) Oxidised – gains oxygen Must be a redox! Mg ? Mg2+ O ? O2- Put the e- in. +2e- +2e- Oxidised – loss of e- Reduced – gain of e- Cu(s) + 2AgNO3(aq) ? Cu(NO3 )2(aq) + 2Ag(s) : Cu(s) + 2AgNO3(aq) ? Cu(NO3 )2(aq) + 2Ag(s) Ag+ ? Ag Cu ? Cu2+ Complete the half-equations +e- +2e- Oxidised? Reduced? Oxidised – loss of e- Reduced – gain of e- Try Question 1. : Try Question 1. H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number Oxidation Numbers : Oxidation Numbers The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O2. Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of C in CO2? ? – 4 = 0 ? = +4 Put the +! Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of Mg in MgCl2? +2 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in a compound add up to zero. Oxidation state of N in NH3? -3 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in SO42-? ? – 8 = -2 ? = +6 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in S2-? -2 Oxidation Numbers : Oxidation Numbers The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of N in NH4+? -3 Try Question 2. : Try Question 2. H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. GCSE : GCSE Oxidation: Gain of oxygen Loss of electrons Reduction: Loss of oxygen Gain of electrons Increase in oxidation number Decrease in oxidation number H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) Covalent! No H+ or OH- Need a new definition. +1 0 -2 0 O H H2(g) + ½ O2(g) ? H2O(g) : H2(g) + ½ O2(g) ? H2O(g) +1 0 -2 0 O H Oxidised? H – increase in oxidation number Reduced? O – decrease in oxidation number Try Question 3. : Try Question 3. Oxidation Numbers and names : Oxidation Numbers and names To avoid any confusion when an element can have several oxidation numbers, the oxidation number is usually mentioned in the compound’s name. In names like “elementate(X)”, the number refers to “element” and not the associated oxygens. So if we look at some examples , we get the following names:- KMnO4 potassium manganate(VII) NaClO3 sodium chlorate(V) POCl2F phosphorus(V) oxydichlorofluoride NaH2PO3 sodium dihydrogenphosphate(III) K2Cr2O7 potassium dichromate(VI) Check the numbers. Try any 3 in Question 7. : Try any 3 in Question 7. Slide 24: Well done!