1372 review 2a - 1 General Chemistry 4th edition Hill...

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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 1
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 2
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 3 isotopic properties The element antimony has an atomic weight of 121.757 amu and only two naturally occurring isotopes. One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu. What is the mass of the other isotope?
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 4 There are two isotopes of Element X. Their percent abundances and atomic masses are: X-20, 62.96% X-21, 37.04% Calculate the weighted average atomic mass in amu.
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 5 What is the wavelength (nm) of a photon emitted by a hydrogen atom when its electron falls from n = 9 to 1? Calculate to 1 decimal place and do not include units.
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 6 How many chlorine atoms are present in 14.3 g of chloroform, CHCl 3 ?
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 7 How many molecules of H 2 O are present in 407.4 g of H 2 O?
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 8 Which of these has the fewest lone pairs in its most important Lewis dot structure? a. H 2 O 2 b. carbonate ion c. nitrite ion d. nitrate ion e. boron trichloride
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 9
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 10 Choose the correct Lewis electron- dot symbol for the atom below. Ba
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 11 How many moles of oxygen are needed to completely combust 4.50 moles of butane, C 4 H 10 ? a. 4.50 b. 58.5 c. 29.3 d. 0.69 e. 6.50
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 12 Combustion analysis of 9.564 g of C 4 H 10 will yield _______ g of CO 2 . a. 0.1646 b. 28.97 c. 3.739x10 -3 d. 7.242
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 13 The skeletal structure shows the arrangement of atoms. Hydrogen atoms are terminal atoms (bonded to only one other atom). The central atom of a structure usually has the lowest electronegativity. In oxoacids (HClO 4 , HNO 3 , etc.) hydrogen atoms are usually bonded to oxygen atoms. Molecules and polyatomic ions usually have compact, symmetrical structures. Writing Lewis Structures: Skeletal Structures Review
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 14 VSEPR Notation and Strategy In the VSEPR notation used to describe molecular geometries, the central atom in a structure is denoted as A , terminal atoms as X , and the lone pairs of electrons as E . Applying the VSEPR method: 1. Draw a Lewis structure of the molecule or ion; 2. Determine the number of electron groups; 3. Identify the electron-group geometry; 4. Identify the molecular geometry.
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