WS2 - Chem 142 Name _ Worksheet 2: Atoms, Molecules and...

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Chem 142 Summer 2011 Page 1 of 2 Name ________________________________________ Section ________________ Worksheet 2: Atoms, Molecules and Ions 1. A 5.00g sample of magnesium phosphate contains 1.39g of magnesium. How much magnesium would a 1.00 kg sample contain? 2. What mass of sodium is in a 4.6g sample of sodium nitrate? 3. For each of the following statements, classify the statement as true or false and explain. a. Protons, neutrons and electrons all have approximately the same mass. b. Atoms with the same number of protons have identical chemical properties. c. All neutral atoms of an element have the same number of protons, neutrons and electrons. d. A compound cannot be a pure substance. e. Both ionic and covalent bonds are formed by the sharing of electrons. f. An ion is formed by the gaining or losing of electrons. 4. Predict the ion formed by each of the following elements: a. Sr b. P c. Rn d. Ra e. Li f. O 5. Determine the chemical formula and name of the ionic compound formed by each of the following pairs of elements:
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This note was uploaded on 01/19/2012 for the course CHEM 142A taught by Professor Campbell during the Summer '11 term at University of Washington.

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WS2 - Chem 142 Name _ Worksheet 2: Atoms, Molecules and...

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