Leila Espinal Grade 8 O.L.C.A. November 20‚ 2013 Lab Report 1. Problem: To find the density of a Hershey chocolate bar. 2. Hypothesis: I think the chocolate bar will gradually decrease in density as it gets smaller. 3: Materials: 1 whole Hershey chocolate bar‚ ruler‚ triple balance beam‚ tray‚ calculator. 4. Procedure: First‚ find the mass‚ volume‚ and density of an entire Hershey Bar. Then‚ systematically‚ break off one section at a time to calculate the
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STANDARDISATION OF HYDROCHLORIC ACID REPORT Aim: To standardize an unknown solution of hydrochloric acid Method: See INSTRUCTIONS for practical 6.2 & 6.3 Results: Attempt No. | Titre (mL) | | 1 | 20.9 | Rough Titration | 2 | 20.5 | | 3 | 20.7 | Concordant Titres | 4 | 20.7 | | 5 | 20.7 | | (1) Tabled Results (2) Concordant Titrations Results 20.7 mL | 20.7 mL | 20.7 mL | Average of Concordant: (20.7 + 20.7 +20.7) 3= 20.7 mL Calculations:
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introduce the use of basic laboratory measuring devices; to demonstrate different methods of manipulation of numerical quantities. DENSITY AND SPECIFIC GRAVITY Materials and Methods Part 1: Density of an Unknown Solid 1. We first were asked from our laboratory instructor to attain an unknown solid and were asked to note down the number of the solid. 2. Determine the mass of the unknown solid to the nearest 0.001 g and record it in the data table in the back of the laboratory workbook
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and calculate the resonance frequency in different ways. Meanwhile‚ there is a requirement to use the apparatus proficiently. For the last part of the experiment‚ there is a demand to analyze the phenomenon and get a better understanding. Moreover‚ from this experiment‚ we can understand the principle of this experiment and learn some circuit knowledge. Background/ Theory In the experiment‚ in an LRC circuit‚ a resistor(R)‚ an inductor (L) and a capacitor (C) are required to connect in series
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essential oil from the fruits of Solanum erianthum‚ a species extensively used in traditional medicine. The essential oil from fruits was extracted by hydrodistillation and the chemical composition of the essential oil was analyzed by gas chromatography-mass spectrometry (GC-MS). The yield of essential oil based on the dry weight of the plant was 0.05 % (v/w). Twenty two compounds accounting for 99.2 % of the total oil were identified. The main compounds were 9‚ 12-Octadecadienoic acid (Z‚ Z)-
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signaled an incomplete reaction between the cations and HCl. The next objective was to separate the lead(II) ion from the mixture. The test tube with all three solids precipitated at the bottom was heated‚ which allowed the PbCl2 to dissolve. The supernatant fluid containing the Pb(II) ions was then separated from the solid mercury(I) ions and solid silver ions decanting‚ adding a drop of acetic acid to the supernatant fluid‚ and also adding two drops of K2CrO4 to the test tube. A milky yellow mixture was
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The Virtual Lab – ELISA Test Lab: Immunology 09/04/2013 Instructors: Dr. Charlie Wilson Written by: Dipen Patel I. Objective: The purpose of the lab was to learn the procedure of performing an ELISA test to determine whether a particular antibody is present in a patient’s blood sample. ELISA is an abbreviation for “Enzyme-linked Immunosorbent Assay." II. Introduction: The interaction of antigen and antibody outside the body can be used to determine if patient
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References: a) http://en.wikipedia.org/wiki/Reynolds_number b) http://www.engineeringtoolbox.com/reynolds-number-d_237.html c) http://www.engineeringtoolbox.com/laminar-transitional-turbulent-flow-d_577.html d) http://www.slashdocs.com/prqt/lab-report-osbourne-reynolds-apparatus.html APPENDIX The Reynolds Apparatus that was used during the experiment.
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I.Purpose The purpose of this lab is to show how potential energy and kinetic energy is shown and transferred using a model rollercoaster. This lab also demonstrates the Law of Conservation of Energy. II.Introduction Potential and Kinetic energy have a very big relationship. The Law of Conservation of Energy states that “Energy cannot be destroyed or created‚ but can be transformed or transferred.” This lab will help demonstrate this law and show the conversion between Kinetic and Potential
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number of potassium (3919K) is_19_. This means that a potassium atom has _19 protons and 19_ electrons. 7. What is the atomic mass of K? ___39________. 8. The atomic mass represents the number of _protons_ and _neutrons. 9. The isotope 14C differs from 12C in that 14C has (pick one of the following) more; less; same) neutrons. 10. Electrons are arranged in electron shells. The electron shell closest to the nucleus has a maximum capacity of _2___ electrons‚ whereas the second shell holds a maximum
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