Test 1 Solutions

Test 1 Solutions - 1. Since the species has 17 protons, it...

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1. Since the species has 17 protons, it must be chlorine; the protons of an atom never change. There is one more electron than the total protons, so the species has a negative 1 charge. Therefore, Cl - is the answer (B) 2. Bromine is a halogen, and halogens exhibit a 1 - charge as ions. (E) 3. 97.9g Li / 6.04 g/mol * 6.022*10 23 atoms/mol = 8.49 * 10 24 (B) 4. According to the solubility rules, Pb 2+ is insoluble when combined with a halogen, including Iodine. (B) 5. There is 10.0g of each species, so the only aspect you must compare is the molar mass of each. The lower the molar mass a species has, the more the atoms will be in that 10.0g. For instance, Helium has a molar mass of 4.003g/mol, whereas Kr has a molar mass of 83.80 g/mol. Therefore, it takes less Kr atoms than He in order to obtain 10.0g of Kr, being bigger than He. He, having the least molar mass, is the answer (A). 6. Only choice A shows a change in the oxidation states. Mg (s) goes from a 0 oxidation state to +2, and hydrogen goes from +1 to 0. 7.
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This note was uploaded on 04/09/2008 for the course PSYC 101 taught by Professor Nosek during the Fall '07 term at UVA.

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Test 1 Solutions - 1. Since the species has 17 protons, it...

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