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Questions and Answers
State what happens to the sodium sulfate in step 1.
State what happens to the sodium sulfate in step 1.
dissolves in water
State what is removed from the filtrate in step 3.
State what is removed from the filtrate in step 3.
water
Describe what must be done after the filtrate has been heated in step 3 to obtain a larger amount of sodium sulfate crystals.
Describe what must be done after the filtrate has been heated in step 3 to obtain a larger amount of sodium sulfate crystals.
leave it to cool
State what must be done to the residue before it is allowed to dry in step 4 to obtain pure copper(II) carbonate.
State what must be done to the residue before it is allowed to dry in step 4 to obtain pure copper(II) carbonate.
Identify the substance removed from the copper(II) carbonate in (d)(i).
Identify the substance removed from the copper(II) carbonate in (d)(i).
Complete the expected observations. The student carries out a flame test on solid T.
Complete the expected observations. The student carries out a flame test on solid T.
State the colour change. The student adds the first portion of solution T to a test-tube containing acidified aqueous potassium manganate(VII).
State the colour change. The student adds the first portion of solution T to a test-tube containing acidified aqueous potassium manganate(VII).
Identify the gas produced. The gas produced turns filter paper soaked in acidified aqueous potassium manganate(VII) white.
Identify the gas produced. The gas produced turns filter paper soaked in acidified aqueous potassium manganate(VII) white.
To the solution produced in (c)(i), the student adds aqueous barium nitrate. Observations.
To the solution produced in (c)(i), the student adds aqueous barium nitrate. Observations.
Identify two cations that the tests and observations in Table 3.1 show could be in solid U.
Identify two cations that the tests and observations in Table 3.1 show could be in solid U.
Describe an additional test that the student could do to confirm which one of the two cations identified in (d) is in solid U. Give the expected result for one of the cations. Test.
Describe an additional test that the student could do to confirm which one of the two cations identified in (d) is in solid U. Give the expected result for one of the cations. Test.
Describe an additional test that the student could do to confirm which one of the two cations identified in (d) is in solid U. Give the expected result for one of the cations. Cation
Describe an additional test that the student could do to confirm which one of the two cations identified in (d) is in solid U. Give the expected result for one of the cations. Cation
Identify the anion in solid U.
Identify the anion in solid U.
Plan an experiment to find how many water-soluble coloured compounds there are in a beetroot.
Plan an experiment to find how many water-soluble coloured compounds there are in a beetroot.
Suggest why the measuring cylinder is inverted several times after the aqueous barium nitrate is added.
Suggest why the measuring cylinder is inverted several times after the aqueous barium nitrate is added.
Suggest why the measuring cylinder is left to stand before the level of the precipitate is recorded.
Suggest why the measuring cylinder is left to stand before the level of the precipitate is recorded.
Give a reason why burettes are used rather than measuring cylinders.
Give a reason why burettes are used rather than measuring cylinders.
Suggest why burettes are used rather than volumetric pipettes.
Suggest why burettes are used rather than volumetric pipettes.
Sketch the graph obtained if all of the experiments are repeated using aqueous barium nitrate of half the concentration used in Experiments 1 to 8.
Sketch the graph obtained if all of the experiments are repeated using aqueous barium nitrate of half the concentration used in Experiments 1 to 8.
Flashcards
Copper(II) Carbonate
Copper(II) Carbonate
An insoluble chemical compound used in experiments, often forming a solid residue.
Sodium Sulfate
Sodium Sulfate
A soluble salt that dissolves in water and forms a solution.
Filtration
Filtration
A process used to separate solids from liquids by passing through a filter.
Crystallization
Crystallization
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Residue
Residue
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Filtrate
Filtrate
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Precipitate
Precipitate
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Flame Test
Flame Test
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Barium Sulfate
Barium Sulfate
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Chromatography
Chromatography
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Gas Tests
Gas Tests
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Sulfur Dioxide
Sulfur Dioxide
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Nitric Acid
Nitric Acid
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Dilution
Dilution
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Ion Tests for Cations
Ion Tests for Cations
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Ammonium Ion Test
Ammonium Ion Test
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Color Change in Reactions
Color Change in Reactions
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Potassium Manganate
Potassium Manganate
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Societal Use of Barium
Societal Use of Barium
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Precipitate Formation
Precipitate Formation
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Analyzing Colored Compounds
Analyzing Colored Compounds
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Sulfate Test
Sulfate Test
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Acidified Silver Nitrate Test
Acidified Silver Nitrate Test
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Measurement Accuracy
Measurement Accuracy
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Chemical Reaction Observations
Chemical Reaction Observations
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Potassium Hydroxide Reaction
Potassium Hydroxide Reaction
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Flame Color Identification
Flame Color Identification
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Study Notes
Examination Information
- Examination: Cambridge IGCSEâ„¢
- Subject: Chemistry
- Paper: Paper 6 Alternative to Practical
- Date: October/November 2024
- Time allowed: 1 hour
- Candidate Number: 0620/61
- Total marks: 40
- Instructions: Answer all questions, using a black or dark blue pen. Do not use an erasable pen or correction fluid. You may use a calculator. Show all working and use appropriate units.
Practical Chemistry Procedure
- A student mixed copper(II) carbonate powder and sodium sulfate crystals.
- Step 1: Added distilled water to the mixture and stirred.
- Step 2: Filtered the mixture.
- Step 3: Heated the filtrate until crystals formed.
- Step 4: Left the residue to dry in a warm place.
Chemical Reactions and Observations
- Sodium sulfate dissolved in water.
- Water from the filtrate was removed in Step 3.
- Leaving the filtrate to cool would produce more sodium sulfate crystals.
- Washing the residue before drying removes any sodium sulfate present.
Further Experiments
- Experiments 1-8 involved investigating the reaction between aqueous magnesium sulfate and aqueous barium nitrate
- Specific volumes of each reagent were used in each experiment.
Data Analysis
- Table 2.1 shows the results of the eight experiments.
- The level of precipitate formed at various volumes was recorded.
- The relationships between volumes were plotted on a graph.
Additional Tests and Observations
- Flame test on solid T resulted in a red flame colour.
- Solid T (lithium sulfite) in solution, acidified with Potassium Manganate(VII), caused a colour change from purple to colourless.
- A different portion of the solution, treated with nitric acid and then silver nitrate, produced a yellow precipitate.
- Adding chlorine to the solution turned it brown.
- Further tests identified iron and chromium ions in solid U.
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