Experiment no. 2 Classification of Matter Morillo‚ Mary Jane J. Nidua‚ Maria Angelene Group no. 2/Chemistry Lab./Engr. Ma. Jeanette U. Obias Abstract The classification of matter was demonstrated through simple activities of mixture‚ heating and magnetic attraction describing its physical state ‚ its chemical reactions and its separation to other substances. Simple reagents such as Iron filings and Sulfur powder in our experiment were considered as elements‚ while solid mixtures such
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Subject: Chemistry SL Title: Preparation of a salt (lead iodide) by using precipitation method. Aim: To produce 1.50 g of lead iodide‚ PbI2‚ assuming 100 % conversion‚ using 1.00 g solid potassium iodide‚ KI‚ and 0.1 M lead nitrate‚ Pb(NO3)2 solution of volume 30 cm3 and hence calculate percentage yield. Calculations: 2KI(s) + Pb(NO3)2( aq) —> PbI2 (s) + 2KNO3 (aq) Mass of PbI2 to be produced = 1.5 g Moles of PbI2 = = 0.003 Moles of KI = 0.003*2 = 0.006 Mass of KI = 0.006*166 = 1.00 g
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Physical and Chemical Change Objective: Recognize and distinguish between chemical and physical changes. Materials: - lab balance - microspatula - lab burner - dropper pipet - 5 test tubes - mortar and pestle - test tube rack - magnet - test tube holder - insulating pad - watch glass - safety goggles - glass square - lab apron or coat - copper sulfate pentahydrate - iron fillings - sodium chloride - magnesium ribbon - hydrochloric acid - paper
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Nick Sarris‚ April 3‚ 2013‚ D-Bell Biology Virtual Electrophoresis Lab – Genetic Science Learning Center Use the link to complete the following lab. Submit through edline when you are finished http://learn.genetics.utah.edu/units/biotech/gel/ Title‚ name‚ date and bell (8 pts) Place your answer below the question and skip between questions (2 pts) Each question is worth 3 points 1. Why can’t DNA be sorted physically‚ using a microscope?- They are so tiny that they are unable to be
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Determining the Acceleration Due to Gravity with a Simple Pendulum Quintin T. Nethercott and M. Evelynn Walton Department of Physics‚ University of Utah‚ Salt Lake City‚ 84112‚ UT‚ USA (Dated: March 6‚ 2013) Using a simple pendulum the acceleration due to gravity in Salt Lake City‚ Utah‚ USA was found to be (9.8 +/- .1) m/s2 . The model was constructed with the square of the period of oscillations in the small angle approximation being proportional to the length of the pendulum. The model was supported
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Potentiometric Titrations Accuracy The accuracy of a potentiometric analysis is limited by the measurement error for the cell’s potential. Several factors contribute to this measurement error‚ including the contribution to the potential from interfering ions‚ the finite current drawn through the cell while measuring the potential‚ differences in the analyte’s activity coefficient in the sample and standard solutions‚ and liquid junction potentials. Errors in accuracy due to interfering ions
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will have a weaker concentration than the potato‚ and the water molecules travel through a partially permeable membrane by osmosis. In a case where the potato is in a solution with a high concentration of salt‚ the potato mass will decrease because the potato is less concentrated than the salt solution‚ and the water will move through the partially permeable membrane into the stronger solution. On the other hand‚ if the potato mass remains the same after the
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During the operation of sand washing machine‚ customers may encounter some problems‚ such as the amount of washed asnd is decreasing‚ the sand is leaking‚ the damage of sand net‚ bolt ollseness‚ vibration of sand making machine‘s fixing frame‚ the sudden raised noise of transmission part‚ gear damage due to its lack of lubrication‚ etc. Here are some tips about sand making machine’s damage and resolution. 1). As to its bearing‚ the usual damage is lubrication shortage and seal ring breakdown
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The Power of Success The Long March of Mao Zedong and the Salt March by Gandhi have many similarities yet many differences. Both historic marches were similar in that they were started by men who wanted to change their country and went on to have great influence and power in their country. Both marches were similar in that they involved many people and were unconventional ways of seeking power and change. However‚ the marches were different because one was violent and the other was peaceful.
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Types of Mixtures Lab Purpose • To classify types of mixtures • To determine the polarity of substances Background Information: Polarity In the middle of the night of March 24‚ 1989‚ the giant oil tanker Exxon Valdez veered out of the shipping lanes in Alaska’s Prince William Sound and struck a reef. The side of the tanker was ripped open‚ and 11 million gallons of crude oil flowed out into Alaska’s clear blue waters. Because petroleum oil is insoluble (does not dissolve) in water and less
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