CHEM 1311, Chapter 1-3 Questions With Complete Solutions

What is Planck's constant represented as? correct answer: h What is the value of Planck's constant? correct answer: 6.63 x 10^-34 Js How is the principal quantum number symbolized? correct answer: n How is angular momentum quantum number symbolized? correct answer: l How is magnetic quantum number symbolized? correct answer: m or mℓ How is spin quantum number symbolized? correct answer: s or ms In quantum mechanics, how many quantum numbers are needed to describe electron density distribution? correct answer: 3 What does principal quantum number (n) indicate? correct answer: Size of orbital What are the possible values for n? correct answer: greater than or equal to 1 - infinity What is angular momentum number (l) related to? correct answer: shape of orbital What are the possible values for l? correct answer: greater than or equal to 0 - (n-1) Which letter is designated to l=0? l=1? l=2? l=3? l=4? correct answer: s, p, d, f, g Rules for Counting Significant Figures correct answer: -all nonzero digits are significant -zeros between nonzero digits are significant -leading zeros aren't significant, they're to locate the decimal -trailing zeros are significant IF the number contains a decimal point -trailing zeros are NOT significant if the number doesn't contain a decimal How many significant figures are in 34,200? correct answer: 3 How many significant figures are in 1.23 E-3? correct answer: 3