"Melting point urea" Essays and Research Papers

Sort By:
Satisfactory Essays
Good Essays
Better Essays
Powerful Essays
Best Essays
Page 7 of 50 - About 500 Essays
  • Good Essays

    freezing point or melting point of water is the temperature at which water changes phase from a liquid to a solid or vice versa. The freezing point describes the liquid to solid transition while the melting point is the temperature at which water goes from a solid (ice) to liquid water. In theory‚ the two temperatures would be the same‚ but liquids can be super cooled beyond their freezing points so that they don’t solidify until well below freezing point. Ordinarily the freezing point of water is

    Premium Sodium chloride Water Melting point

    • 703 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    chemistry

    • 360 Words
    • 2 Pages

    generally high melting points‚ are loose and flexible with their electrons‚ conduct electricity well‚ and have low solubility in water. Ionic compounds are generally crystals‚ have a high melting point‚ and usually have high solubility in water and conduct electricity well when dissolved in water. Covalent compounds have individual molecules‚ have a low melting point‚ and do not conduct electricity‚ and their solubility in water depends on the type of covalent bond. In the melting point test‚ the

    Free Ionic bond Chemical bond Electron

    • 360 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Part A.3. Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high‚ too low‚ or unaffected? Explain. -The freezing point will be higher because the loss of solvent means that the molarity of solute is too high. The melting point will be lower than expected. 5. Part B.2. The solute dissociates slightly in the solvent. How will the slight dissociation affect the reported molar mass

    Free Melting point Chemistry Solution

    • 319 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Systhesis of Dulcin

    • 620 Words
    • 3 Pages

    temperature be raised when determining a melting point? When can the temperature be raised more quickly? 2) If there is an Impurity present in a sample‚ what is the effect on the melting point? 3) Explain why a) salt‚ spread on roads in the winter‚ helps prevent icing in‚ for instance‚ southern Ontario‚ and b) salt is useless on the much colder roads of Manitoba. 1) You would have to slowly raise the temperature up when determining the melting point due to the sensitivity of the dulcin being

    Premium Temperature Melting point Water

    • 620 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Preparation of Dibenzalacetone by the Aldol condensation David o Neill Date of experiment: 14/12/2011 Apparatus Steam bath‚ ice bath‚ Buchner funnel‚ beaker‚ conical flask‚ filter paper‚ TLC apparatus‚ Melting point apparatus Materials / chemicals Benzaldehyde‚ acetone‚ ethanolic sodium hydroxide‚ ethanol Introduction The synthesis of dibenzalacetone is formed from an Aldol condensation reaction. An Aldol condensation reaction is a very effective way of forming a carbon – carbon bond reaction‚ in

    Premium Aldehyde Thin layer chromatography Carbonyl

    • 1496 Words
    • 6 Pages
    Powerful Essays
  • Better Essays

    drug. The identity of the drug was determined through melting point‚ percent recover‚ and Rf values. The comparable data for acetaminophen from the manufacturer is 500mg of active ingredient. After conducting the experiment-extraction‚ distillation‚ and evaporation- 451mg of active ingredient. This relates to a 68.1% recovery. The melting point was between 158 and 165 degrees Celsius‚ which is almost ten degrees lower than the published melting point of acetaminophen. After conducting a TLC plate‚ the

    Premium Paracetamol Solvent Acetic acid

    • 1180 Words
    • 4 Pages
    Better Essays
  • Good Essays

    Recrystallization

    • 604 Words
    • 3 Pages

    claim). -The Salicylic acid that I obtained had a melting point range around 157-158 degrees Celsius for Part A. For Part B the melting point range was 156-157.5 degree Celsius. Part B‚ I would say the sample is less pure because of the notion that impurities lower the melting point. Since part A ‘s melting point was higher and closer to the melting point of the pure sample‚ it was more pure. The pure Salicylic acid that I got the melting point for had a range from 158-159 degrees Celsius. The impure

    Premium Temperature Purity Celsius

    • 604 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Melting Ice * Salt is routinely used to make icy roads and sidewalks safe in the winter. As soon as the salt comes in contact with the ice‚ the surface of the ice starts to melt. This only works‚ however‚ if the temperature outside is at or near freezing. If it is too cold outside‚ the ice itself becomes very dry and salt is not as effective in melting it. Salt Reduces Freezing Temperature of Water * Salt works by lowering the freezing temperature of water. Salt water needs to reach a colder

    Premium Water Melting point Snow

    • 639 Words
    • 3 Pages
    Good Essays
  • Good Essays

    recrystallized to form a solid‚ clear‚ crystal- like product. The melting was taken from the recrystallized product to determine what had been obtained. The melting point was found to be 130.5°C-133.7°C. Concluding that the product formed from the addition of bromine was a mixture of the erythro-2‚ 3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 204°C‚ and threo-2‚3-dibromo-3-phenylpropanoic acid‚ which has a known melting point of 95°C. Meaning the recrystallized product was a racemic

    Premium Water Solid Liquid

    • 547 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Chemistry Lab 22

    • 534 Words
    • 3 Pages

    98075 Dear Mrs. Sylva‚ After days of research‚ I have come upon one of the substances that will be the ideal compound for the glaze. I conducted a test to analyze the solubility of the substance in water and alcohol‚ the conductivity‚ and melting point. Some substances came very close to passing all the tests‚ but only one substance was able to pass all of them. I recommend using sodium carbonate as your substance. Of all the substances‚ only two were covalent and two were ionic. The ionic

    Premium Water Melting point Sodium chloride

    • 534 Words
    • 3 Pages
    Satisfactory Essays
Page 1 4 5 6 7 8 9 10 11 50