Matterials: The materials needed to carry out the experiment were: 3 flasks A bottle of water A bottle of sodium bicarbonate‚ A bottle of vinegar‚ 1 tube 1 x data-logging thermometer Standard lab thermometer 3 one-holed stoppers Paper and pencil to record the data Variables: Independent variable The distance the flask from the lamp The amount of sodium bicarbonate The amount of vinegar Dependent variable The change in temperature of the CO and air. Controlled variable
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One way to test a material for the presence of sodium bicarbonate is to take a sample and add HCl (Hydrochloric Acid) and see if a chemical reaction (bubbling‚ releasing Carbon Dioxide) occurs. If this chemical reaction does occur‚ then the material does in fact contain Sodium Bicarbonate. B. All Purpose Cleaner with Bleach – the reaction remained blue from the Bromthymol Blue‚ and then turned clear again after about
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water. The cause of hardness is the precipitation of soap and hence prevents lathering. Hardness of water is of two types: 1. Temporary/Alkaline/Carbonate hardness is due to dissolved bicarbonates of Ca2+ & Mg2+ in water. It is so called since it can be easily removed simply by boiling with bicarbonates readily getting precipitated. Ca(HCO3)2 à CaCO3 + H2O + CO2 Mg(HCO3)2 à MgCO3 + H2O + CO2 Ca(HCO3)2 /Mg(HCO3)2 + 2C17H35COONa à (C17H35COO)2 Ca/Mg + 2 NaHCO3 CaCl2/MgCl2 + 2C17H35COONa
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Title Laboratory Techniques and Measurements Purpose The purpose of this experiment is to determine mass‚ length‚ temperature‚ volume‚ and density of objects and liquids using common measuring devices and algebraic formulas. The metric system‚ the most common set of measurements used in science‚ which includes meters‚ liters‚ Celsius‚ and grams will be used. Procedure The following items were used within the experiment: (1) Metric ruler with centimeter (cm) and millimeter (mm)‚ (1)
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Purpose: The purpose of this experiment is to analyze four drinking water samples from different places using four of the standard drinking water tests required by the EPA. The experiment will be performed by a four person group‚ with each person providing a different water sample. The four tests to be performed are: pH‚ conductivity‚ phenolphthalein and total alkalinity‚ and total and non-carbonate hardness. Data from these four tests will be gathered and analyzed‚ drawing conclusions “about
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Title:Extraction:Extraction with acid and alkaline Objective: 1. To recover benzoic acid and p-dichlorobenzene from its mixture using acid-alkaline extraction. 2. To determine the percentage recovery and melting point of benzoic acid and p-diclorobenzene. Apparatus:Separatory funnel(250mL)‚Buchner funnel‚beaker. Materials:Benzoic acid‚p-dichlorobenzene‚ether‚10% NaOH‚conc.HCl‚distilled water‚ anhydrous CaCl2. Introduction: Organic compounds in an aqueous mixture can be separated
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AP Lab #5 Plant Pigments/Photosynthesis I. Identifying the Effects of Different Variables of Light and Carbon Dioxide on the Rate of Photosynthesis and Observing the Separation of Pigments Through Chromatography II. Introduction Plants have a variety of pigments‚ all of which absorb a different color of light. The three main pigments are chlorophyll a‚ chlorophyll b and carotenoids. Chlorophyll a is the primary plant pigment that absorbs red and blue light‚ which ultimately appears green to the human eye
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Weathering Process Physical Weathering Processes Freeze Thaw (Frost Shattering) Temperatures need to fluctuate above and below freezing. When the temperature drops below 0 degrees‚ water collected in rock cracks freezes and expands. When temperatures rise again the ice melts. Pressure created by expansion results in progressive weakening of the rock. At high altitudes frost-shattered material forms scree slopes. Heating & Cooling Thermal expansion & contraction of rock in response
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soluble‚ my exception was Sodium Iodide and Copper(II) Nitrate. My barium Nitrate combined with Sodium sulfate was insoluble with is correct accourding to the solubility rules. All reactions with Chloride should have been soluble and they were. All Bicarbonate were in soluble‚ these I thought were soluble‚ until I moved it over dark paper. Carbonate and Hydroxides were all insoluble percipitante. Negative Ion (Anions) | Positive Ions (Cations) | Solubility of Compounds | All negative ions are_____with
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1) The mechanical and chemical receptors that control digestive activity are located in the walls of the GI tract organ. (854) 2) The chemical and mechanical processes of food breakdown are called digestion. (852-853) 3) The function of the hepatic portal circulation is to collect absorbed nutrients for metabolic processing and storage. (881) 4) When we ingest large molecules such as lipids‚ carbohydrates‚ and proteins‚ they must undergo catabolic reactions whereby enzymes split these
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