* 9/4/12 12.3 - crystal structures crystalline structure: possess rigid and long-range order; its atoms‚ molecules‚ or ions occupy specific positions (Exs. wax ‚ice‚ sugar‚ salt‚ diamond‚ etc.) unit cell: basic repeating structural unit of crystalline solid -there are seven types of unit cells coordination number: number of atoms surrounding an atom in a crystal lattice -higher coordination number --> more tightly packed structure 3 types of cubic unit cells: -primitive cubic (sc) c#:
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S.4Chemistry 2nd Term Project Be a Chemical Analyst-Analysis on ethnoic acid. Objective This experiment aims at determining the percentage by mass of ethanoic acid(CH3COOH) in a commercial vinegar using titration method. Chemical reaction involved: CH3COOH(aq) + NaOH(aq)→ NaCH3COO(aq) + H2O(l) Apparatus: An electronic balance‚ a 10.0cm3 pipette‚ a 25.0cm3 pipette‚ a pipette filler‚ a 250.0cm3 volumetric flask‚ a burette‚ stand and clamp‚ a conical flask‚ a white tile‚ 3 large beakers‚
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ALCOHOLS Alcohols are compounds in which one or more hydrogen atoms in an alkane have been replaced by an -OH group. For the purposes of UK A level‚ we will only look at compounds containing one -OH group. For example: Primary alcohols In a primary (1°) alcohol‚ the carbon which carries the -OH group is only attached to one alkyl group Some examples of primary alcohols include: Secondary alcohols In a secondary (2°) alcohol‚ the carbon with the -OH group attached is joined directly to
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Nuclear Chemistry webquest by Margaret Moore semester 1 Chemistry Part One 1) The term Half-life for a radio-active substance means the time it takes for the substance to decay while decreasing by ½. 2) Spontaneous fission is a type of radioactive decay in heavy elements with unstable nuclei being split into more stable smaller fragments 3) Two important application of neutron radiation are neutron therapy for tumors/cancer and neutron bombs for defense. 4) Ionization radiation is radiation
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Review for First Quarter Exam AP CHEMISTRY List of topics – Chapters: review‚ 1‚ 2‚ 3.1 and 3.2 1. Scientific Method 2. Significant Figures 3. Calculation with significant figures 4. Uncertainty 5. Density problems 6. Density Graphs interpretation 7. Dimensional Analysis 8. States of Matter 9. Classification of matter 10. Separation techniques 11. Structure of the atom a. historical development: Democritus; Aristotle; Dalton (postulates‚ law of definite proportions‚ law of multiple
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Area: Business Permit and Licensing Office Size/Dimension of Area: 181.5 sQm. Location: Municipal City Hall of Bacoor‚ Cavite City (Ground Floor) Area Description: As the name implies‚ this is a place where in Business permits and licenses are dutifully processed. It is located at the ground floor level of the Municipal Hall because it is one of the most visited – therefore‚ one of the busiest – offices in the building‚ hence‚ it was strategically placed on the Ground floor for easy access
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Test Paper Chemistry Section 1 : Multiple choice‚ circle the best choice A‚ B‚ C‚ or D in each questions. Each Question Carries 1 mark 1. Which of the following processes do water molecules gain heat? A. Melted ice cream freezing when put in to refrigerator B. Water droplets forming on outside of a cold can of soda C. Icecube melting when left outside D. Water droplets forming on a window on a cold day 2. Which of the following properties should a sponge have to carry out its functions
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PVR bluO Entertainment Limited (PVR bluO) Presently the Company operates two bowling alley centers at Ambience Mall-I‚ Gurgaon and Ambience Mall-II‚ at Vasant Kunj‚ New Delhi. The Company has made a roadmap for expansion of its business and will accordingly open additional bowling centers in India at Pune‚ Bangalore‚ Chandigarh‚ Ludhiana and Noida. These bowling centers on being operational are expected to enhance the income and profitability of the Company. Industry Structure & Development The
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Majed Al Dhwaihi Chem 151 Lab Prelab Assignment for week 3 Chemical Separation Procedure: Separating the sample: First place a small amount of the spinach provided in the mortar‚ just enough to cover its bottom; combined with the sand provided to break down the call walls. A 1:1 mixture of hexane and acetone was determined to best solvent for this extraction. Knowing this add one mL of the pure hexane and one mL of the pure acetone to the mortar. Grind the contents until the cell walls
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then in professional life that person has a patient waiting for the doctor‚ whereas the doctor doesn’t know what to do???... That is a big responsibility. This is how it becomes a big problem for that someone and the person suffering. People may cheat and pass their exams but in the future they face difficulties. There is no use of education if cheated. People should not be afraid of failing; As Failing is just a step away from success. “It is hard to fail‚ but it is worse never to have tried
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