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Chemical testing for Ions OCR SCIENCE – UNIT 1 BEST PRACTICE Prior learning Chemicals can react together and change colour Key words React, precipitate,

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Presentation on theme: "Chemical testing for Ions OCR SCIENCE – UNIT 1 BEST PRACTICE Prior learning Chemicals can react together and change colour Key words React, precipitate,"— Presentation transcript:

1 Chemical testing for Ions OCR SCIENCE – UNIT 1 BEST PRACTICE Prior learning Chemicals can react together and change colour Key words React, precipitate, colour change, identify, Cations, Anions

2 I am learning to: identify cations and anions in different solutions by their colour change I will be successful if I can: Describe the term cation and anion and explain the test to be carried out Carry out a practical activity safely (having completed a risk assessment) to confirm the presence of different cations an anions Complete a table to show results of practical tests Conclude, Evaluate and comment on reliability of the test Outcome: I can identify unknown ions in a given solution. TO ACHIEVE A MERIT: 1.Add DETAIL to your report by explaining what is happening in each step using the guidance sheets. 2.Relate the results of the test back to the scenario of students becoming ill having played on the playing fields. 3.Complete an aim, prediction and method in handwritten form to add to your testing notes. Any of these can be completed at home or with Ms C’s help at break, lunch or after school. OCR SCIENCE – UNIT 1 BEST PRACTICE

3 Introduction: what are ions? I am learning to:identify cations and anions in different solutions by their colour change Ions are charged particles. Positively charged particles are called CATIONS (because they are attracted to the negative electrode called the cathode which are usually metals) Negative Ions are called ANIONS because they are attracted to the anode these are usually non-metals

4 Reference I am learning to:identify cations and anions in different solutions by their colour change IonTestResult ChlorideAdd Silver nitrate SolutionWhite precipitate SulphateAdd acidified Barium chloride solution White precipitate CarbonateAdd dilute acid and test gas with limewater Milky white precipitate Copper (Cu ++ )Add Sodium hydroxide solutionBlue precipitate IronAdd Sodium hydroxide solutionBrown precipitate

5 Reference I am learning to:identify cations and anions in different solutions by their colour change Copper Cations Iron Cations Sodium hydroxide

6 Reference I am learning to:identify cations and anions in different solutions by their colour change Carbonate Anions Chloride Anions Silver Nitrate Acid

7 Reference I am learning to:identify cations and anions in different solutions by their colour change Sulphate Anions Barium Chloride

8 Risk Assessment I am learning to:identify cations and anions in different solutions by their colour change x What is the overall level of risk? (Tick appropriate box – if risk is high further steps must be taken to minimum the risk of the procedure) Department: Science Room Number: R4 Brief summary of activity: Chemical tests for chlorides, sulphates and carbonates List hazardous procedures and the hazards) relating to them Procedure Using squirt bottles & glass Hazard Chemical in eye, broken glass cuts List the substances hazardous to health and the hazards) relating to them Substance chemicals Hazard Irritant, harmful and corrosive Risk and Safety phrases Wear goggles List who might be exposed to the hazard substance(s). (e.g. staff, students, visitors, cleaners) Staff & pupils Assessing the level of risk How severe is any injury or health effect likely to be? Medium How likely is exposure to the hazard? Medium High Medium Low Emergency Procedures(first aid actions, fire actions, spill action) Wash hands under cold water Wipe up any spills Brush up broken glass and put in glass bin Disposal requirements Technician to dispose of waste in prep room Date: Name: Signature :

9 Results I am learning to:identify cations and anions in different solutions by their colour change TestSamples Add Silver nitrate solution Add acidified Barium chloride solution Add dilute acid and bubble gas through limewater Add Sodium hydroxide Sample ion A BSoil CWater

10 Results I am learning to:identify cations and anions in different solutions by their colour change TestSamples 123watersoil Add Silver nitrate solutionyesXXYesX Add acidified Barium chloride solution XYesXXX Add dilute acid and bubble gas through limewater XXXXX Add Sodium hydroxidexXyesX Sample ionchloridesulphatecopperchlorideIron

11 Conclusion of findings Conclusion of findings: _______________________________________________________________ _______________________________________________________________ I am learning to:identify cations and anions in different solutions by their colour change

12 Reliability 1.Do qualitative tests tell you how much of a substance is present? No, just if the substance is present 2. If the test substance is a mixture will one get clear results? No more than one result may show 3. Will the tests work if the substance is insoluble?no 4. Is there an amount of substance needed to get a positive test? Small amounts of each substance should work 5. Can your test substances be contaminated? Yes if clean pipettes are not used I am learning to:identify cations and anions in different solutions by their colour change

13 HOMEWORK Complete the associated worksheet on Chemical tests Approx. 10mins I am learning to: view samples using a microscope and test samples for metals using flame tests

14 I am learning to: identify cations and anions in different solutions by their colour change I will be successful if I can: Describe the term cation and anion Carry out a practical activity safely to confirm the presence of different cations an anions Complete a table to show results of practical tests Outcome: I can identify unknown ions in a given solution. OCR SCIENCE – UNIT 1 BEST PRACTICE

15 Summary – draw the colour changes of each test on plain paper I am learning to:identify cations and anions in different solutions by their colour change Copper Cations Iron Cations Sodium hydroxide


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