appliances and is used in commercial kitchens. Fires involving cooking fats and oils (classified as class K (US) or F (Australia/Europe/Asia)) burn hotter than flammable liquids‚ rendering a standard class B extinguisher ineffective. Flammable liquids have flashpoints under 100 degrees Fahrenheit. Cooking oil is a combustible liquid since it has a flashpoint over 100 degrees. Such fires should be extinguished with a wet chemical extinguisher. Extinguishers of this type are designed to extinguish cooking
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we are immensely interested in solutions‚ especially liquid solutions. Solutions are defined as homogeneous mixtures of pure substances in which no precipitation or settling occurs. We often think of solutions as liquids‚ but we can have solutions of solids (alloys)‚ gases (air is a solution of nitrogen‚ oxygen‚ carbon dioxide‚ and a number of other gases)‚ and a combination of states such as liquid and solid metals (amalgams) and liquids and gases (nitrogen in the blood‚ carbonated beverages)
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negative oxygen is attracted to the positive parts * “Like dissolves like” – describes whether one substance will dissolve in another. Water for example can’t dissolve nonpolar substances Concentrations on Solutions * Solvent: The liquid in which a solute is dissolved to form a solution. * Solute: The minor component in a solution‚ dissolved in the solvent. * The ratio of the amount of solute versus the amount of solvent is the concentration of the solution. * Solutions
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Experiment 2&3 Recrystallization and Melting Points Determinantion of Benzoic Acid Abstract In experiment 2‚ recrystallization was used to purify the crude benzoic acid extracted from a mixture during experiment 1. Then a percent recovery for this recrystallization process was calculated. In experiment 3‚ the melting point ranges of the crude and purified benzoic acid were both determined by using Melt Temp Apparatus. Introduction Recrystallization is a purification technique for non-volatile
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(g/mL) for liquid samples of matter. For that reason if the volume is known of a liquid‚ determining its density is easily determined by weighing it accurately. Density can also be used as a tool for finding the concentration of solutions in some cases. The density is different in a substance when a substance is added to a pure liquid to when both the solute and solvent were separate all together. There are many ways to determine density. This method determined the density of a liquid by weighing
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2-methylaniline > 2-chloroaniline From Table 3‚ the negative κsE values suggest that the structure-forming tendency dominant over to the structure-breaking tendency due to the hetero molecular interaction between the component molecules of the binary liquid mixtures. The magnitude of sE shows the following the sequence: 2-methoxyaniline > 2-methylaniline >
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the thrust exerted on the large plunger? (400 N) c) How much work is done by the operator‚ if the smaller plunger moves down 0.1 m? (2J) 4. In a given U-tube open at left end and closed at right end‚ if the pressure above the liquid in the right arm is p‚ find the value of p. Given d2 = 2 x 13.6 g/cm3 d1 = 13.6 g/cm3. Atmospheric pressure pa = 76 cm of Hg. 5. What will be the length of mercury column in a barometer tube when the atmospheric pressure is 75 cm of mercury and
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relation between precipitation state % precipitating conditions 3. To learn the way to examine whether reactants are fully precipitated 4. To learn the principals of powder material synthesizing through room temperature solid phase method & liquid phase method directional growing crystal form of precipitation Experiment Principals 1.the process of precipitation forming constitutive crystal ion accumulating growing forming nuclei sediment particals amorphous precipitation crystal nuclei
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temperature of the Paradichlorobenzene every 30 seconds and of the water every 30 seconds. 15. When the temperature of the Paradichlorobenzene is within 3-5 degrees of the temperature of water‚ stop recording and remove the thermometer from the liquid‚ then remove the test tube from the water bath. 16. Clean up as
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Singapore Polytechnic School of Chemical and Life Sciences Basic Mathematics [MS2125] Active Learning Assignment Part I Submitted by: Yap Xin Yi (1416237) Yjasmin Yvette Morales Naquila (1452129) DCHE/FT/1A/06 Date of submission: 18 July 2014 Q1. Fill in the table below: (The table below is to help you in your brain-storming; you do not need to be specific or accurate at this stage‚ but try to think divergently.) (5 marks) What do we know about this problem? (i.e. what information is
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