Be sure to record the weight of a 50-mL beaker that will be used in the step‚ in order to determine the weight of the crude caffeine. Transfer the ethyl acetate liquid into another 50-mL beaker‚ rinse the small one-armed Erlenmeyer flask with another 5 mL of ethyl acetate‚ and transfer the remaining ethyl acetate liquid into the beaker once more‚ to ensure all the caffeine has been gathered and transferred to the beaker. To remove the ethyl acetate solution‚ a blowing procedure will be done
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measured using a triple beam balance. Units used to measure it are grams‚ metric tons ‚ milligrams ‚ and kilograms . Volume is the amount of space enclosed by a shape or object‚ how much 3-dimensional space it occupies. It can be occupied by a solid‚ liquid or gas. The volume can be measured in cubic meters‚ cubic centimeters‚ or liters. Sometime around 250 BCE‚ the Greek mathematician Archimedes was given the task of determining whether a craftsman had defrauded the King of Syracuse by replacing
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immense objects to float in liquid‚ is buoyant force‚ more commonly known as buoyancy. A solid object’s density determines whether or not the buoyant force of a liquid can lift it. The density of an object depends upon its weight and its size. Given two solid objects that are different sizes‚ but weigh the same‚ the smaller‚ more compact object is the denser of the two. Fluids also have density. When an object is placed in the fluid‚ it pushes aside some of the liquid and‚ if its density is greater
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completion. $ 4. Weigh a clean dry evaporating dish. $ 5. Decant the liquid remaining in your test tube into the evaporating dish. $ 6. Pour 2-3 ml distilled or de-ionized water into test tube and rinse any remaining zinc with water and decant the water into the evaporating dish also. If you have no remaining zinc pieces‚ rinse the test tube and decant the liquid into the dish. $ 7. Heat the evaporating dish until there is no more liquid remaining in the dish. The solid remaining will have a puffy and
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Discussion The purpose of the Density Lab was to determine the identity of four unknown solids and two unknown liquids by calculating their densities and comparing them to a density chart‚ taking into account error analysis and finally classifying the substances. In order to calculate this density‚ we first found the mass of the container that was to be holding the substances. We then found the volume of the substance‚ and lastly determined the mass of the container and substance. We subtracted
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Keeping it Liquid Introduction: Phase changes within our world play a key role in how substances can be manipulated‚ and formed. A phase change is‚ “a change from one state (solid or liquid or gas) to another without a change in chemical composition” (Collins Italian Dictionary‚ 2016). Moreover‚ in this experiment‚ the use of tert-butanol was needed to perform phase changes. Tert-butanol is colorless oily with sharp odors‚ mixes with water‚ and has a freezing point of 78 degrees Farenheit (PubChem
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Bato Balani Journal #1 p. 8 1. How was the first quasicrystal discovered? - The quasicrystal was discovered while Daniel Shechtman was experimenting on a chilled molten mixture of aluminium and manganese which revealed a 10-fold symmetry. 2. Compare crystals and quasicrystals. - the crystal‚ the patterns are tightly packed‚ they have no space in between‚ and look the same in whatever angle. And the quasicrystal‚ the atoms exhibit a regular pattern‚ but the pattern is not repeated. 3. What are
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Landolfi Due Date:11/1 Purpose the purpose of this lab is to determine the freezing and melting temperature of water. Freezing temperature‚ the temperature at which a substance turns from a liquid to a solid‚ and melting temperature‚ the temperature at which a substance turns from a solid to a liquid. Hypothesis If the water is at a low temperature then it will freeze. If it is at a high temperature then it will melt. Materials 1.Computer 2.Vernier Computer Interface Logger Pro
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purpose of this lab is to determine an accurate time when the ice completely melts and the water starts to boil. The problem is which type of temperature change will result from heating ice to liquid‚ then boil (steam)? What will happen to the water after the boil? I hypothesise the water heats ice to liquid and then goes to simmer and boil. The independent variable is the hot plate changed to a burner itself. The dependent variable is what we are measuring is the time. The steps in the lab
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Senior Science Half-Yearly Revision 1. Surface tension - A property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface‚ such as that of another portion of liquid. Surface tension is caused by cohesion (the attraction of molecules to like molecules). Since the molecules on the surface of the liquid are not surrounded by like molecules on all sides‚ they are more attracted to their neighbours on the surface. Mercury has a high surface
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