of increasing atomic number with the elements having similar properties placed in vertical columns is known as periodic table. MATERIALS/REAGENTS AND EXPERIMENTAL PROCEDURE For the Group IA & IIA Elements‚ each small amount samples ofLi2CO3‚ Na2CO3‚ K2CO3‚ MgCO3‚ CaCO3 and BaCO3 was place in the different test tubes. After placing them in the test tubes‚ we identified the physical state‚ color‚ and appearance of each. Then we test the solubility of each sample by using water. For the Group IVA
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was observed in the reaction(actual yield)‚ divided by the mass of the precipitate that was hypothesized in the calculations (theoretical yield). This number was multiplied by a hundred to determine the percent yield (equation 4). Equation 1: Na2CO3 (aq) + Ca(NO3)2 (aq) CaCO3 (s) + 2NaNO3 (aq) Equation 2: n = OR mole = Equation 3: Percent Yield = × 100 Hypothesis: The law of conservation of mass states that the mass of the reactants must be equal to the mass
Free Stoichiometry Chemical reaction Sodium
DESIGN OF AN ABSORBER Problem statement To design an absorber (packed tower) for the absorption of 785.15 kg/h of sodium metabisulphite (Na2S2O5) at an average temperature of 68˚C and Y atm pressure with sulphur dioxide gas counter-currently reacting with Na2SO3 rich feed. Introduction Absorbers are vertical towers used in distillation‚ gas absorption and liquid-liquid extraction processes. Absorbers can be operated co-currently or counter currently. In the former‚ both fluids involved are fed
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representative samples of each food group under different conditions‚ such as increased/decreased pH and presence of other substances‚ were observed. A pancreatin solution was first prepared from a hog pancreas and was completely neutralized using 0.5% Na2CO3. Afterwards‚ 3 mL each of the neutral pancreatin solution was placed in 7 test tubes and were further added with other specified reagents. The test tubes containing HCl were not effective in digesting the biomolecules since pancreatin is only active
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contains four sections‚ SECTION A to SECTION D. Instructions: Answer all questions in SECTION A - SECTION D. Make sure that the section heading is included and your answers are correctly numbered. The assignment must have a completed cover sheet. It must be placed in the drop-box on or before the deadline. st SECTION A ELECTRONIC STRUCTURE & IONIZATION ENERGY 1. 2. Write the electronic structure in s‚p‚d notation of the following: O‚ Na‚ Na+‚ Al‚ Cl- and Co
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Materials: • Test tubes • Test tube rack • Test tube holder • 10 mL graduated cylinder • 100 ml beaker • Bunsen burner • Nichrome wire • Magnesium ribbon • Litmus paper(red) • Stirring rod • Crucible tong Procedures: We placed a pinch of NaCl‚ Na2CO3‚ and K2CO3 in
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Chemical Reactions Lab Introduction Four different types of chemical reactions were observed in this lab. Synthesis reactions occur when two different elements or compounds form a more complex compound as shown by equation (1). Single replacement occurs when one element replaces another to form a new compound as shown in equation (2). Double replacement occurs when two different atoms in different compounds trade places with one another to form two new compounds as shown in equation (3).Combustion
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determines solubility of ionic compounds. This demonstration is beneficial to use in both the Solution and Solubility‚ and Chemical Reactions units. | Materials | distilled water – saturated sodium bicarbonate (NaHCO3) – 20% sodium carbonate solution (Na2CO3) - phenolphthalein indicator – saturated barium chloride (BaCl2) – sodium dichromate crystals – concentrated hydrochloric acid – water glass – wine glass – milk glass – beer mug | Safety | All chemicals must be handled carefully and with respect
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|Barfoed’s reagent | |conc. HCl |Orcinol reagent | |solid Na2CO3 |conc. HNO3 | |dilute NaOH |
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We were employed (used from) other organic or inorganic bases such as piperidine‚ 1‚8-diazabicyclo[5.4.0]undec-7-ene (DBU)‚ NEt3‚ KHCO3‚ NaHCO3‚ K2CO3 and Na2CO3‚ in instead of morpholine for the first step of reaction‚ followed by ??equivalent of morpholine in acetonitrile (entries 2-8). We observed the best yield of thiophene 4a was obtained‚ when NEt3 used as the base of the first step of reaction (entry
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