CHM 1020 Final: Chapter 3 Short Study Guide

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Chemistry and Biochemistry
CHM 1020

Chapter 3 Molecules, Compounds, and Chemical Equations Short Study Guide What is mass percent composition? Why is it useful? The mass percent is the elements percentage of the compounds total mass. It is one way to express how much of an element is present in a given compound. What kind of chemical formula can be obtained from experimental data showing the relative masses of the elements in a compound? The chemical formula that can be obtained from the experimental data is empirical formula that converts data from grams to moles by dividing it in smallest whole numbers. What is the difference between an alkane, an alkene, and an alkyne? Alkanes are hydrocarbons that contain single bonds only, while alkenes contain double bonds, and alkynes contain triple bonds. Determine the number of each type of atom in each formula: a. Ca(NO 2 2 atom of Ca, 2 atoms of N, and 4 atoms of O. b. CuSO 1 atom of Cu, 1 atom of S, and 4 atoms of O. 4 c. Al(NO 3 3 atom of Al, 3 atoms of N, and 9 atoms of O. d. Mg(HCO )3 2atom of Mg, 2 atoms of H, 2 atoms of C, and 6 atoms of O. Write the name from the formula or the formula from the name for each hydrated ionic compound. a. Cobalt(II) phosphate octahydrate: Co (P3 ) 4 2 8H 2 b. BeCl22H 2: Beryllium Chloride Dihydrate c. chromium(III) phosphate trihydrate: CrPO 3H O 4 2 d. LiNO H O: Lithium Nitrite Monohydrate 2 2 Name each acid. a. HI(aq) hydroiodic acid b. HCIO(aq) chlorous acid c. HSO(aq) sulfuric acid Calculate the mass (in kilograms) of chlorine in 25 kg of each chlorofluorocarbon (CFC). 1000 2 2 1 2 2 2 35.45 a. CF C2 :225kg CF C2 x2 1 x 120.91 x 1 x 1 x 2 2 2 2 2 2 1 1000 = 15kg Cl
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