a. Describe the arrangement and movement of particles in each of the three states of matter. Use diagrams to help you with your explanation. Explain what happens to the particles in a liquid during boiling. separate the dyes in a sample of food colouring. Explain how this method works using appropriate diagrams. road surfaces. Explain why this is done and what effect it has. b. Food colourings contain a mixture of water-soluble dyes. Devise a method to c. When there is a lot of ice in the roads in the UK, tonnes of salt are added to th

a. Describe the arrangement and movement of particles in each of the three states of matter. Use diagrams to help you with your explanation. Explain what happens to the particles in a liquid during boiling. separate the dyes in a sample of food colouring. Explain how this method works using appropriate diagrams. road surfaces. Explain why this is done and what effect it has. b. Food colourings contain a mixture of water-soluble dyes. Devise a method to c. When there is a lot of ice in the roads in the UK, tonnes of salt are added to th

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 4Q

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Filtration of samples A, B, and C show no residue left. After letting them dry in different beakers, SAmple A remains no residues. Sample B shows crystal leftovers, and sample C show brown film on the beaker walls. This means that: a. Two or more samples are heterogenous b. Two or more samples are homogenous c. all sample have 2 or more phases d. all samples are pure
How can you tell that a compound is impure? (or pure?) What are the characteristics considered when taking a melting point? What is recrystallization? What is happening on a molecular level (videos are provided) How are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?
In each of the following situations, what type of filtration device would youuse? (Do not consider centrifugation when answering this question.)a. Remove powdered decolorizing charcoal from 20 mL of solutionb. Collect crystals obtained from crystallizing a substance from about 1 mL of solutionc. Remove a very small amount of dirt from 1 mL of liquidd. Isolate 0.2 g of crystals from about 5 mL of solution after performing acrystallizatione. Remove dissolved colored impurities from about 3 mL of solutionf. Remove solid impurities from 5 mL of liquid at room temperature
Assignment: This is an individual activity. After studying the lesson and watching all the videos, answer the following questions. Answer in not more than 3 sentences per question. 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced?
Real life applications of standardization of NaOH.
In a paper chromotography lab for food dyes, why does a water solvent system make the food dyes travel farther than a salt water solvent system?
Use this video to answer the questions: https://www.youtube.com/watch?v=BocfSXdbaU0
3. You found a weird ceramic material on the street and wonders if it might be ok to use in a medical device. What technique can you use to figure out the chemical composition of the surface? What can you use to see what the surface looks like?
What are pipeline slurry systems? How do they function?
A batch of raw milk was tested and found to contain a bacterial population of 8xl06cfu/ml. It is to be pasteurised at noc for 33 seconds. The average D value at 52°C for the mixed population is 11 min. The z value is 10°C.i)Explain the terms "D value" and "z value".ii)Calculate how many organisms will be left after pasteurisation.iii)Hpw much time will be needed at 62°C to accomplish the same degree oflethality?iv. How much time will be needed at 82°C to achieve the same degree oflethality?
Explain etch process removing copper ferrite chloride? Why a mask used? Why is a negative image required? Why anything black removed and anything white will be copper? If two layers, why does top layer have to be mirrored so that ink surface on tracing paper touches photoresist?
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