A flame test is conducted when an element is burned and the flame produces a color different the starting flame color. When the coffee stirrer was put into the flame‚ the element’s atoms (from the solution of the stirrer) left the original level of energy. When the atoms fell back to ground level‚ they released photons in the form of colored flame. Using the flame test‚ unknown compounds can be identified when they are burned since each element has a specific color. (Douma‚ 2008). The color
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Which of these compounds is most likely to be covalent? A. Rb2S B. SrCl2 C. CS2 D. CaO E. MgI2 4. Which of these compounds is most likely to be covalent? A. CsOH B. NF3 C. Sr(NO3)2 D. CaO E. LiF 5. The Lewis dot symbol for the chloride ion is A. B. C. D. E. 6. Which of these ionic solids would have the largest lattice energy? A. NaCl B. NaF C. CaBr2 D. CsI E. CaCl2 7. Which of these solids would have the highest melting point? A. NaF B. NaCl C. NaBr
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Lab 20: Flame Tests Purpose/Objective: The ground state is the normal electron configuration of atoms or ions in an element. When atoms or ions in ground state are heated to a higher temperature‚ some electrons absorb enough energy to move them to higher energy levels. This is known as the excited state. However‚ the excited configuration is unstable‚ and the electrons must return back to their positions in the lower energy level. As they return‚ the energy that was previously absorbed is now emitted
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|Question 1 | |A client has been hospitalized after an automobile accident. A full leg cast was applied in the emergency room. The most important reason for| |the nurse to elevate the casted leg is to | |
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Leibermann-Burchard Test i. Objectives: To determine the presence of unsaturated sterols‚ in this test‚ cholesterol in the given sample. ii. Results Sample Observations Residue C Blue green solution Vegetable Oil Emerald Green solution iii. Discussion Cholesterol is a member of a large group of substances called steroid‚ which include vitamin D. Cholesterol is an essential component of cell membrane‚ brain and nerve cells‚ and bile‚ which helps the body absorb fats and fat soluble vitamins. The
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Self-assessment practice tests Test 1 – Material from Chapters 2–4 | 45 minutes 1 The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter. 1 2 3 What are the three states shown? 1 A B C D 2 gas liquid solid liquid 2 liquid gas liquid solid 3 solid solid gas gas The graph shows the heating curve for a metal that is solid at room temperature (25
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The Evaluation of TOEFL test Xiajie Tang TOEFL stands for Test of English as a Foreign Language. The test is not a test for business or professional purposes. That is‚ the TOEFL test is not intended for students of a particular subject or major. The purpose of TOEFL is to assess English proficiency of persons especially for international students whose native language is
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EXPERIMENT No.25BACILLUS: Diagnostic Tests | | ASCOLI’S THERMOPRECIPITIN TEST Purpose: used to identify anthrax bacilli in animal hides and meat. Principle: This test was designed to detect B. anthracis antigens in the tissues of animals being utilized in animal by-products and thereby to reveal when these products contained ingredients originating from animals that had died of anthrax. The thermostable antigens involved are common to other Bacillus species so the test depends on the fact that the
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Test-driven development cycle A graphical representation of the development cycle‚ using a basic flowchart The following sequence is based on the book Test-Driven Development by Example.[1] 1. Add a test In test-driven development‚ each new feature begins with writing a test. This test must inevitably fail because it is written before the feature has been implemented. (If it does not fail‚ then either the proposed "new" feature already exists or the test is defective.) To write a test‚ the
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Dan Eble PSYC 105 G Dr. Waterstreet Test Reliability and Validity Correlations are important in establishing test reliability and related test validity. Test reliability has four methods of testing. The first is the test-retest method‚ which is when the same test is given to students at two different occasions and the scores are then correlated for production. The second is the alternate form test‚ which is when two forms of the same test is given to students and the scores are then correlated
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