Lab #4 Emission Spectroscopy and Flame Test Date of Lab: 10/24/13 OBJECTIVE To observe a continuous spectrum‚ emission spectrum‚ and an absorption spectrum‚ and be able to distinguish among the three. To be able to identify metal ions by doing a flame test and looking at a spectrum. At the same time increasing the ability to use and understanding of lab equipment‚ in this case‚ a spectroscope. To be able to calculate the frequency and energy of certain frequencies of light. PROCEDURE
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Determining the value of molar mass of chosen compound Marta Dürrigl 1mmA Chemical reaction: b.) CaCO3 (s) + 2HCl (aq) ----------- CaCl2 (aq) + CO2 (g) + H2O(l) AIM: The aim of this investigation is to experimentally determine the molar mass of carbon dioxide (CO2) by measuring its volume and calculating its mass. CO2 which we will measure will arise as a product of a chemical reaction between Calcium Carbonate (CaCO3) and Hydrochloric acid (HCl) as it is shown in the chemical
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Solubility‚ Crystallization and Melting Point Determination Post-Lab Discussion Guidelines: Part 2A and 2C: Draw tables (as in textbook) showing which combinations were soluble/miscible and which were insoluble/immiscible. Explain why this is so. Why are certain chemicals soluble/miscible when others are not? Part 3A: Calculate % recovery (this is not the same as % yield – see handout from the first day of lab if you’re confused)‚ and determine melting point of your product. Discuss % recovery
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Avogadro’s Number and Molar Mass Handout Key 1. What is the coefficient for oxygen when the following equation is balanced using the lowest‚ whole numbered coefficients? ____ C3H8O(g) + ____ O2 (g) ____ CO2 (g) + ____ H2O(g) a) 3 b) 5 c) 7 d) 9 2. What is the sum of the coefficients when the following equation is balanced using the lowest‚ whole numbered coefficients? _____ PH3 (g) + _____ O2 (g) _____ P4O10 (s) + _____ H2O(g) a) 10 b) 12 c) 19 d) 22 3. What is the sum of the coefficients when
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Post Partum Depression Most women expect to feel elated after their child is born. Nine months of anticipation are coming to an end. Relatives and friends have all provided their support and words of encouragement to help you pass the time of carrying the child more pleasurable and easier. Who would have thought that there is now another obstacle to overcome? But the question would remain to most new mothers what this new task would be. And the answer would quickly become visible. Post Partum Depression
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Multiple Choice Questions: (3 points each = 30 points) 1) A graduated cylinder is filled with 25.0 mL of water. A solid sample is dropped into the graduated cylinder and the 3 water rises to the 37.6 mL mark. What is the mass of the solid if its density is 2.81 g/cm ? A) 9.79 g B) 106 g C) 0.223 g D) 70.3 g E) 35.4 g ____________________________________________________________________________ 2) A mass of methanol occupies 0.200 L. What volume would an equal mass of hexane occupy? The density
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Lab Report for Chemical Changes and Conservation of Mass Lab Previous to the reaction‚ the magnesium appeared to be a solid‚ white‚ black‚ and grey substance with many small dark particles within the substance. The hydrochloric acid was a clear liquid that looked like water It weighed 42.2 grams in total. During the reaction‚ the two substances produced bubbles‚ creating smoke and became warm with a smell that is irritating to the human nose. After the reaction‚ it appeared to be a clear‚ bubbly
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The Ka and Molar Mass of a Monoprotic Weak Acid Chemistry Lab 152 Professor: James Giles November 7‚ 2012 Abstract: The purpose of this experiment was to determine the pKa‚ Ka‚ and molar mass of an unknown acid (#14). The pKa was found to be 3.88‚ the Ka was found to be 1.318 x 10 -4‚ and the molar mass was found to be 171.9 g/mol. Introduction Acids differ considerable as to their strength. The difference between weak and
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Using a Dumas method‚ you are asked to identify the unknown pure liquid by comparing the molar masses of the given possible substances (ethanol‚ methanol‚ isopropanol‚ acetone). Introduction Dumas Method allows us to measure the molar mass of the substance‚ using the Ideal Gas Law. The Ideal Gas Law‚ PV=nRT‚ explains the behaviour of the gases that are near 100kPa and in the room temperature. This equation shows the product of the pressure(P) and volume(V) equals to the product of the number of moles(n)
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CORROSION LAB REPORT THE CHANGE IN MASS(±0.005g) OF VARIOUS TYPES OF CORROSIVE METALS WHEN PLACED IN A SOLUTION OF 1 MOLAR CONCENTRATION OF HYDROCHLORIC ACID OVER A PERIOD OF 8 DAYS AT AN AVERGAE ROOM TEMPERATUR OF 24 DEGRESS CELCIUS. Research Question: Does the mass(±0.005g) of various types of corrosive metals (iron‚ nickel‚ zinc‚ copper and tin) change when placed in a solution of 1 molar hydrochloric acid over a period of 8 days at an average room temperature of 24 degrees Celsius? Aim:
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