0.9 0.8 0.7 Absorbance 0.6 0.5 0.4 0.3 0.2 0.1 0 400 450 500 550 600 650 700 750 λ max 500 nm 550 nm • • Make sure you understand the directions for using the spectrophotometer and have them written in your manual. Complete the questions on the prelab page. Introduction: There are many different chemical methods that can be used to determine the concentration of a solution. You have already used one method, titration, to find the concentration of Ca+2 ions in a sample of water, and another, density, in finding the concentration of ethanol. In this lab you will use a method called visible spectroscopy to determine the concentration of a solution of CoCl2.
Copper Cycle Lab Purpose: In this experiment the student will gain familiarity with basic lab procedures, some chemistry of a typical transition element, and the concept of percent yield. Equipment: Balance (2) 250 mL beakers Evaporating dish Stirring rod Hotplate 100 mL grad cylinder Weighing paper Materials: 0.5 g of copper wire 2.0 M H2SO4 (aq) Acetone Conc. HNO3 (aq) 3.0 M NaOH Granular zinc Introduction: Understanding the type of reaction taking place is an important part of predicting the products of a reaction. Common chemical reactions can be described as synthesis, decomposition, single replacement, double replacement, combustion, or oxidation and reduction reactions. Each of these types of reactions behaves in a similar fashion.
Keep track of which mineral you are working with as you record your observations. 2. Record your observations of each test in Part 1 of this worksheet. Help: Refer to the job aids in the upper right corner of the test screens to help you interpret what you observe. 3.
SEPARATION OF A MIXTURE OF SUBSTANCES LAB Purpose: Every chemical has a set of defined physical properties, and when combined they present a unique fingerprint for that chemical. When chemicals are present in a mixture, these unique physical properties can be utilized to separate the chemicals into their pure states. This experiment will give you experience in separating the components in a three-compound mixture; ammonium chloride, sodium chloride (table salt), and silicon dioxide (sand). Background: Because there are 3 components in our mixture, we will need several techniques to separate them. For this particular exercise, you should be familiar with the following: • Sublimation: Many chemicals will sublime (phase change from solid state to gas state) provided the right conditions.
Compare the efficiencies of the two distillation methods in your lab notebook. Postlab questions: 1,3 on p. 65. Please include the answers in the appropriate section of your lab report. (Results and Discussion or Conclusions) Sept. 11-17 Prelaboratory
Experiment#2 “Separating the Components of a Ternary Mixture” By Mohammad Bazargan Lab partners: Aaron Radtke, Kevin Campbell, Austin Gilchrist Instructor: Professor Mundell Section #: 12 Sep/14/2011 Abstract In this laboratory, we used physical and chemical properties to separate the components of a ternary (three substances) mixture. We also determine the percentage of each substance in the mixture. The percentages are the following,38.2% NaCl, 40.45% SiO2, and 72.84% CaCO3.The mentioned substances were all separated using methods such as filtration, evaporation and reaction with other chemicals which will be explained throughout this report. Intro Mixtures are \ physical combinations of two or more substances where each substance keeps its own chemical identity. Mixtures can be classified as either homogeneous or heterogeneous.
Graded Assignment Physical Science Foundations (Sem2) | Nature of Matter | Lessons 5 and 6 Graded Assignment—Physical Science Foundations, Unit 1, Lessons 5 and 6 Lab Report: Viscosity Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. (3 points) Score 1. Write the goal of the lab or the question you tried to answer. Answer: you will investigate how temperature influences viscosity by methodically racing quantities of honey down a cookie sheet.
Experiment and Observation: Please note that this procedure was adapted from the “Anions, Cations, and Ionic Reactions” LabPaq Lab manual (Hands-On Labs Version 42-0304-82-00-01, 2015) Please reference this manual for further information on the lab experiments. The first experiment was to perform a qualitative anion test. This was done by observation of chemical reactions and recording the results in Data Table 1. Using the information from the reactions we were able to identify unknown substances and recorded the results in Data Table 1. Data Table 1: Anion Confirmation Tests Chemical | Anion | Addition of AgNO3 | Addition of HCl | NaBr | Bromide | Cloudy white thin solution | Clear with sedimentation | Na2CO3 | Carbonate | Clear with white sedimentation | Bubbles, sedimentation combined to one formation | NaCl | Chloride | Milky white, white sedimentation | No visible change | Nal | Iodide | Pale green cloudy, sedimentation | Sedimentation dispersed to smaller pieces, solution clears in color | Na2SO4 | Sulfate | No visible changes noted | Milky white | Na2S | Sulfide | Clear with amber sedimentation | No visible Change noted | Unknown #103 | CarbonateNa2CO3 | Cloudy white thin solution | Bubbles, Sedimentation combined to one
They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble. This would make us lean toward pentane but we felt strongly that ethyl ether because of the density was a much better test because there is much less human error and the we asked about how do you decide if something is insoluble
Identify the acid-base reactions from the reactions shown on this worksheet. 23. Think about the reactions for which we have written ionic equations. Which category of reactions would they best fit in to? Explain your answer.