Knowee
Questions
Features
Study Tools

Name at least three types of chromatography.2. What are the two phases of chromatography and how do they work to separate molecules?3. Name two uses for chromatography4. List the cautions and dangers of the lab exercise

Question

Name at least three types of chromatography.2. What are the two phases of chromatography and how do they work to separate molecules?3. Name two uses for chromatography4. List the cautions and dangers of the lab exercise

🧐 Not the exact question you are looking for?Go ask a question

Solution

  1. Name at least three types of chromatography.

    • Thin Layer Chromatography (TLC)
    • Gas Chromatography (GC)
    • High-Performance Liquid Chromatography (HPLC)

  2. What are the two phases of chromatography and how do they work to separate molecules?

    • The two phases of chromatography are the stationary phase and the mobile phase. The stationary phase is a solid or a liquid supported on a solid, while the mobile phase is a liquid or a gas that flows through the stationary phase. Molecules in the mixture interact differently with the stationary and mobile phases, causing them to move at different rates and thus separate from each other.

  3. Name two uses for chromatography.

    • Chromatography is used in pharmaceuticals to purify compounds and to test the purity of substances.
    • It is also used in environmental testing to detect pollutants in water and soil samples.

  4. List the cautions and dangers of the lab exercise.

    • Always wear appropriate personal protective equipment (PPE) such as gloves, goggles, and lab coats to protect against chemical exposure.
    • Be aware of the potential hazards of the chemicals being used, including flammability, toxicity, and reactivity. Ensure proper ventilation and use fume hoods when necessary.
    • Handle all equipment carefully to avoid breakage and potential injury. Follow all safety protocols and guidelines provided by the laboratory.

This problem has been solved

Similar Questions

What is chromatography?a.A technique used to separate molecules on the basis of differences of solubility and adsorption properties.b.A simple technique used to separate solvent from solution.c.A simple technique used to separate solution of different concentration.d.A technique used to separate molecules on the basis of colour.Clear my choice

In which type of chromatography the stationary phase held in a narrow tubea.Liquid Chromatographyb.Paper chromatographyc.column Chromatographyd.Thin layer chromatographyClear my choice

What is chromatography used to separate?An insoluble solid from a liquidTwo or more liquids with different boiling pointsDifferent substances dissolved in a liquidTwo or more different gases2Which of the following statements about paper chromatography is not true?Less soluble substances travel further up the paperSubstances are separated based on how attracted they are to each phaseThe stationary phase is the paperThe mobile phase is the solvent3What are Rf values useful for?To determine how much solvent to use in the chromatography procedureTo calculate how much paper to useTo identify unknown samples by comparing them with known samplesTo determine the number of different substances in a solvent4How is the Rf value of a substance calculated?Distance moved by substance divided by distance moved by solventDistance moved by solvent minus distance moved by substanceDistance moved by solvent divided by distance moved by substanceDistance moved by substance multiplied by distance moved by solvent5In the core practical ‘Paper chromatography to investigate the composition of ink’, a line is drawn at the bottom of the paper onto which spots of known ink colourings plus an unknown sample are placed. There are several key points to remember when setting up this practical. Which of the following is incorrect? The line must be above the water levelThe line must be in penThe sides of the paper must not touch the beakerThe sample spots should not spread out too far6On a paper chromatogram only one spot is produced. What does this tell you? The paper was not large enoughThe substance being separated is an impure substanceToo much solvent was usedThe substance being separated is a pure substance

V. Questions:1. What are the different methods of preparing emulsions? Describe each.2. What causes emulsions to crack or cream?3. Differentiate creaming from coalescence.

Explain how a pathogen causes a fever.2. Explain why pyrexia, but not hyperthermia, is considered the second line of defence.3. What is a febrile seizure?4. Explain how the interferons and complement proteins participate in the destruction of pathogens and fight infection.

1/1

Upgrade your grade with Knowee

Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.