5/5/2014 APUS CLE : COLL100 B020 Spr 14 : Tests & Quizzes Number Toggle Minimize Opens of users present: jump users present panel Users Content Tools Sites My Workspace COLL100 B020 Spr 14 MATH110 B005 Spr 14 Logout My Sites Home Announcements Calendar COLL100 B020 Spr 14: Tests & Quizzes Quiz 3: Avoiding Plagiarism Messages Forums Part 1 of 2 - 1.0/ 2.0 Points Syllabus Lessons 0.0/ 0.5 Points Question 1 of 10 All published works are copyrighted
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Left Brain Verse Right Brain Characteristics Takoyia Branham COLL100 American Military University April Wick Left Brain Verse Right Brain Characteristics Have you ever heard anyone say that they are a right brain or left-brain thinker? Over decades there has been extensive research done by psychologists proving that in fact our brain works in two different ways. Researchers have discovered that the two sides of the brain work hand in hand with each other‚ and that one cannot function with
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dewees (vd866) – Exam review – dewees – (24127) This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Elements can be distinguished by their 1. hardness. 2. transparency. 3. dissolves in carbon disulfide 4. density of 2.07 g/ml 005 10.0 points Which of these substances I) table salt II) the liquid called coffee III) mercury is a mixture? 3. brittleness. 1. II and III only 4. density. 2. All
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CHEM 101 – General Chemistry I Chapter 2 Reading Assignment Pages 31 - 60 2.1 – What is Matter Made Of? Who 1st discovered atoms – Democritus where the first person to discover atoms. His followers would often think that there were multiple kinds of atoms and not just plain atoms. 2.2 – How Do We Classify Matter? Elements – A substance that consists of identical atoms. Today there are 116 known elements. Example – C= Carbon; H= Hydrogen Compounds – A pure substance made up of two or more elements
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Chemistry 123 Fall ’14 Exam I (CH I‚ II‚ III) Instructions: Read each problem carefully before you begin. Be certain that you answers are clear and legible: Clearly Circle One Answer Only. Make sure to review you answers before you turn the exam in. Please place your answers on the answer sheet. You should also circle the correct letter for back up purposes. Print your name: ___________________ Sign your name: ___________________ Answer Sheet 1 C 16 A 2 E 17 D 3 B
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Honors Chemistry Final Exam Study Guide Multiple Choice- (51 points @ 1/2 point ea.) Identify the letter of the choice that best completes the statement or answers the question. ____ 1. The pair of elements that forms a bond with the least ionic character is |a. |Na and Cl. |c. |O and Cl. | |b. |K and Cl. |d. |Mg and Cl.
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Test #3 Chapter 2: 1) What is matter? 2) What is mass? 3) Matter that has a uniform and definite composition is called a ______. Give an example. 4) A quality/condition of a substance that can be observed/measured without changing the substance is a ________ __________. Give examples. 5) What are the three states of matter? Put the correct state of matter in each box. 6) What is the difference between gas and vapor? 7) What is a physical change? Give an example. 8) A physical blend
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of water in barium chloride dihydrate. Solution: The formula mass of BaCl2(2H2O is Ba 1 x 137.3 = 137.3 amu Cl 2 x 35.5 = 71.0 amu H2O 2 x 18.0 = 36.0 amu 244.3 amu The theoretical percentage of water is found by dividing the water of crystallization mass‚ 36.0 amu‚ by the hydrate mass‚ 244.3 amu. 36.0 amu x 100 = 14.7 % 244.3 amu Problem 2 – Experimental percentage The experimental percentage of water in a hydrate is found by comparing the
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26 Tantalum-181: Electrons: 73‚ Protons: 73‚ Neutrons: 108 76. Ga-69‚ because its atomic mass is closer to the atomic mass of gallium‚ than Ga-71 is. 78. Cr-50 = 0.0435 x 49.946 amu = 2.17 Cr-52 = 0.8379 x 51.941 amu = 43.52 Cr-53 = 0.0950 x 52.941 amu = 5.03 Cr-54 = 0.0236 x 53.939 amu = 1.27 Total = 51.99 amu 80. When the neutron-to-proton ratios is too big or too small‚ it would cause an element to become radioactive 82. An alpha particle is a helium atom with a 2+ charge‚ a beta particle
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Mass1 = mass of first isotope in amu Abundance1 = abundance of first isotope as a percentage n = number of isotopes of element in calculation For example: The natural abundance for boron isotopes is 19.9% 10B (10.013 amu*) and 80.1% 11B (11.009 amu*). Calculate the atomic mass of boron: Average atomic mass = = 10.811 (note that this is the value of atomic mass given on the periodic table) *amu is the atomic mass unit (u‚ μ or amu)‚ which is defined as 1/12th the
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