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Chemistry PP

Module 3 - Practice Problems

QuestionAnswer
3.1 A chemist uses an experiment similar to Experiment 3.2 to decompose 150.0 grams of water. If the chemist finds that he makes 16.7 grams of hydrogen from the decomposition, how much oxygen must he have produced? 133.3 grams
3.2 A compound is decomposed into its constituent elements of carbon, nitrogen, and hydrogen. If, in the decomposition, 12.0 grams of carbon, 14.0 grams of nitrogen, and 3.0 grams of hydrogen were formed,...
3.2(continued) ...what was the mass of the compound before it was decomposed? 29.0 grams
3.3 Identify the fallowing as metal or nonmetal: I, Y, N, Re. I- nonmetal; Y- metal; N- nonmetal; Re- metal
3.4 In an experiment to make hydrogen peroxide, a chemist mixes 20.0 grams of hydrogen with 20.0 grams of exygen. She finds that 21.3 grams of hydrogen peroxide are produced. In addition, there is a lot of hydrogen left over at the end of the experiment.
3.4(continued) How many grams of hydrogen should have been added to the 20.0 grams of oxygen so that there would be no leftovers at the end of the experiment? 1.3 grams
3.5 In making calcium nitride, 100.0 g calcium plus 100.0 g nitrogen makes 152.5 g of product along with some leftover nitrogen. How much nitrogen and calcium should be added together in order to make 1.0 kg of calcium nitride without any leftovers? 344.3 grams of nitrogen and 655.7 grams of calcium
3.6 What is the chemical formula of a molecule that is made up of 3 carbon atoms, 6 hydrogen atoms, 2 chlorine atoms, and one oxygen atom? C₃H₆Cl₂O
3.7 How many total atoms are in one molecule of C₁₂H₂₄O₁₀S₂? Forty-eight
3.8 Which of the following molecules are covalent? (a.) SO₃ (b.) P₂H₆ (c.) CaSO₄ (d.) KF (a.) and (b.)
3.9 Name the compounds in problems 8a, 8b, and 8d. (8a.) Sodium dioxide (8b.) Diphosphorus hexahydride (8c.) Potassium fluoride
3.10 What are the chemical formulas for the following compounds? (a.) tetranitrogen hexahydride (b.) nitrogen monoxide (a.) N₄H₆ (b.) NO
Created by: LiseBrinkley
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