Homework 2-solutions - Version 101 Homework 2 Walker...

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Unformatted text preview: Version 101 Homework 2 Walker (53970) 1 This print-out should have 38 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 1.0 points A factor of 1 . 10- 6 corresponds to the prefix 1. micro. correct 2. milli. 3. mega. 4. nano. Explanation: Micro refers to 1 . 10- 6 . 002 1.0 points The prefix centi means 1. one thousandth parenleftbigg 1 1000 parenrightbigg . 2. one hundred (100). 3. one thousand (1000). 4. one hundredth parenleftbigg 1 100 parenrightbigg . correct Explanation: Centi means parenleftbigg 1 100 parenrightbigg . 003 1.0 points Which set of units is in order of increasing magnitude? 1. nL < mL < dL correct 2. mg < dg < cg 3. mW < kW < cW 4. mA < A < cA 5. Mm < km < cm Explanation: 10- 9 (nL) < 10- 3 (mL) < 10- 1 (dL) 004 1.0 points About how many different elements have been discovered? 1. 1000 2. 100 correct 3. 50 4. 200 Explanation: According to the Periodic Table of Ele- ments, there have been 100 elements discov- ered. 005 1.0 points All of the following elements are composed of diatomic molecules under normal conditions, except 1. neon. correct 2. iodine. 3. fluorine. 4. oxygen. 5. nitrogen. Explanation: Ne is a Noble gas and as such is very sta- ble in atomic form. Under normal conditions Ne does not form diatomic molecules. I, N, O and F are halogens with 7 valence electrons. All that they need to attain a stable noble gas electronic configuration is to gain one elec- tron. They are very unstable in atomic form and are often called free radicals because they are so reactive. 006 1.0 points What is 0.00397 in scientific notation? 1. 3 . 97 10 3 2. 3 . 97 10 5 Version 101 Homework 2 Walker (53970) 2 3. 3 . 97 10- 3 correct 4. 39 . 7 10- 5 Explanation: 0.00397 = 3 . 97 10- 3 (move decimal 3 places to right) 007 1.0 points When coding a number in scientific notation, if you move the decimal point to the left you must multiply by a (negative, positive) power of 10. 1. negative 2. positive correct Explanation: Moving the decimal to the left in scien- tific notation (making the number smaller) requires you to multiply by a positive expo- nent of ten to get back to the original value. 008 1.0 points Which of the following is NOT a true state- ment about gases? 1. Gases have no definite shape. 2. Gases are not compressible. correct 3. Gases have no definite volume. 4. Gas volume decreases with increasing pressure. Explanation: Gases are easily compressed to smaller vol- ume by the application of modest pressure. 009 1.0 points What is NOT true of a gas? 1. A gas exerts pressure continuously and in all directions on the walls of a vessel in which it is contained....
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Homework 2-solutions - Version 101 Homework 2 Walker...

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