Retrieval: Separating Mixtures
Suggest what separation technique should be used in the following scenarios:
Identify the dyes used to colour foods
Obtain pure crystals of compounds used in medicines
Obtain fresh water from seawater
Separate crude oil into different fuels
Remove solids before waste water is purified
Challenge: Explain why a substance will dissolve faster if you increase the temperature of the solvent it is being dissolved in
Chromatography
Crystallisation
Distillation
Fractional Distillation
Filtration
Challenge: At higher temperatures, the particles in the solvent have more kinetic energy and move around quicker, which means the substance dissolves faster
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Chromatography
Chromatography is a separation technique that can be used to separate a mixture of substances dissolved in a solvent
It can also be used to assess the purity of a substance, as we looked at last lesson.
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Learning Check – Key Words
Match the term to its definition:
Solution
Aqueous Solution
Non-aqueous Solution
Solute
Solutions where the solute is dissolved in a solvent that isn’t water (e.g ethanol)
Solutions where a solute is dissolved in water
A solute dissolved in a solvent
A liquid in which chemicals dissolve to make a solution
Solvent
A substance that is dissolved in a solvent
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Chromatography Process
Chromatography is able to separate mixtures because the substances in them have differing attractions to the different phases.
The substance that is the most soluble in the solvent moves the further. Any insoluble substances remain on the reference line.
The stationary phase is the paper
The mobile phase is the solvent
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Paper Chromatography: Method
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Learning Check: Chromatography Method
Ink will move up the chromatography paper along with the substance being tested
The substance being tested will dissolve into the substance into the beaker, and not travel up the chromatography paper
To minimise evaporation of the solution
To make sure different substances do not mix together, which will affect the results
The stationary and mobile phase used
How long the mobile phase is allowed to travel through the paper
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Analysing Chromatograms
Pure & Impure Substances:
A pure substance will only produce one spot on a chromatogram. Impure mixtures will produce several spots as they contain more than one substance
Distance moved by solute
Distance moved by solvent
Rf =
Known & Unknown Substances:
We can compare the distance moved by an unknown mixture to known substances to ascertain what substance the mixture contains
Rf Values:
Retention factor (Rf) values are a way to compare the distances moved by different substances
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Calculating Rf Values
Calculate the Rf value of each of the spots:
Red:
Purple:
Blue:
2
10
6
10
8
10
= 0.2
= 0.6
= 0.8
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Learning Check – Chromatography Extension
A medicine comes in a 5.0g sachet. It contains 120mg of paracetamol per 5.0g, along with other ingredients.
Calculate the Rf value for propyl paraben. Give your answer to 3 significant figures.
4. The Rf value for butyl paraben, which is not found in the medicine, is 0.52. Calculate the distance moved by butyl paraben on the chromatogram.
Mark the position on figure 1.
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Chromatography
Tuesday, 10th November 2020
Learning Outcomes |
Grade 8 Explain the process that causes chromatography to separate substances dissolved in solvents |
Grade 6 Calculate the Rf value on various chromatograms |
Grade 6 Describe how to correctly carry out paper chromatography and Identify the apparatus needed |
HOT Question:
Explain how paper chromatography can be used to ascertain whether a substance is pure or impure
Starter | Activity 1 | Learning Check | Activity 2 | Learning Check | Activity 3 | Learning Check | Activity 4 | Learning Check |
Planets, Orbits and Satellites
Friday, 31 January 2020
Learning Outcomes |
Grade 8 Explain the direction of the different forces on an orbiting body in a circular orbit |
Grade 6 Describe how the velocity of a satellite changes during orbit |
Grade 6 Compare and contrast artificial and natural satellites, and give examples of both |
HOT Question:
Suggest how the role of an artificial satellite is dependent on it’s orbit type