1 STUDY OF LIGHTWEIGHT CONCRETE BEHAVIOUR Lightweight concrete can be defined as a type of concrete which includes an expanding agent in that it increases the volume of the mixture while giving additional qualities such as nailbility and lessened the dead weight. It is lighter than the conventional concrete. The use of lightweight concrete has been widely spread across countries such as USA‚ United Kingdom and Sweden. The main specialties of lightweight concrete are its low density and thermal
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to purify individual chemical compounds from mixtures of compounds’ (Wikipedia‚ 2011). This method is similar to thin layer chromatography‚ but the compounds in the mixture are collected separately. Green dye is used in this experiment that consists of blue and yellow constituents. Materials and Methods: As per SCI105 Chemistry laboratory manual 2012‚ Brooks‚ 2012‚ page 12-19. With the following changes: The mass of recrystallization mixture is 10.05g not 10g. Results: Part
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the heat down and just keep it warm. Once your mixture is ready‚ you will need to separate the yolks from 8 eggs. Put the egg yolks in a medium bowl and whisk until they are thickened. While constantly whisking‚ slowly add 1 cup of the hot milk mixture and whisk until it is blended. Then pour the egg mixture back into the pot of hot milk and increase heat to medium. Stir the mixture constantly with a wooden or plastic spoon‚ until the mixture is thickened (like gravy) and registers between 170°F
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Briefing Thin-layer chromatography (TLC) is an extremely valuable analytical technique. It provides a rapid separation of compounds‚ and gives an indication of the number and nature of the components of a mixture. TLC can also be used to identify compounds by comparison with known samples‚ to check the purity of a compound‚ or to monitor the progress of a reaction‚ an extraction‚ or a purification procedure. This experiment will introduce you to the mechanics of TLC‚ and the chemical principles
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There are many different substances that affect the freezing and boiling points of water. This experiment was designed to test the effects of five liquid and five solid substances/mixtures on the freezing and boiling points of water. It was hypothesized that if we tested five liquid and five solid substances/mixtures then the results would show that the solids would have a greater affect. Using these guidelines the experimentation was completed and the data was recorded. It was determined that the
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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 mixture. I obtained .204 grams of the racemic mixture product‚ meaning my percent yield is 66.23%. Percent yield= experimental yield (the amount obtained) =
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1.1.2 Identify the difference between elements‚ compounds and mixtures in terms of particle theory Elements are simplest form substance meaning cannot be decomposed further physically or chemically. They are made up of same type of atoms only e.g. helium‚ oxygen. Compounds are pure and they consist of 2 or more elements bonded chemically (fixed ratio). They can be decomposed chemically. E.g. sodium chloride‚ carbon dioxide Mixtures are the blending (physically combined‚ hence can be separated)
Free Atom Chemical bond
You can create an aloe vera rinse by taking fresh aloe vera gel from a fresh aloe vera plant and placing it in warm water. Blend the gel from the plant with the warm water until the mixture is smooth. You can use the mixture to rinse your mouth after every meal. Allow the mixture to sit in your mouth for a few minutes before rinsing it out. Ginger Rinse Ginger is frequently used for its antiviral and anti-inflammatory properties. If you suffer from gingivitis‚ it can be used
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Solution‚ Suspension or Colloid? Maddison Thorne 9.11.14 Aim: To use first hand and secondary sources to gather‚ process‚ analyse and present information to identify examples of suspensions‚ colloids‚ and solutions and outline one advantage of a mixture being in each form. Materials: Four 250ml beakers 200ml of 0.01m salt solution. 200ml of colloid milk( mix two teaspoons of milk powder in 200ml of water) 200ml of suspension (muddy water‚ diluted water-based paint) Filter paper Filter funnel‚ Retort
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you accurately weigh your sample of acid and titrate to a phenolphthalein (colorless to pink color) end point using an accurately known dilute solution of sodium hydroxide (0.1000 M). If your unknown is soluble in a greater than 50% ethanol/water mixture‚ then use bromothymol blue as the indicator to give a yellow to blue color change. Using an analytical balance‚ accurately weigh out approximately 0.2 g of your unknown acid (measured to 0.001g) and dissolve in 50 – 100mL of water. It may be necessary
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