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Unformatted text preview: Version 161 – Homework 2 – Walker – (53970) 1 This printout should have 38 questions. Multiplechoice 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. milli. 2. micro. correct 3. nano. 4. mega. Explanation: Micro refers to 1 . × 10 6 . 002 1.0 points The prefix centi means 1. one thousand (1000). 2. one hundredth parenleftbigg 1 100 parenrightbigg . correct 3. one thousandth parenleftbigg 1 1000 parenrightbigg . 4. one hundred (100). Explanation: Centi means parenleftbigg 1 100 parenrightbigg . 003 1.0 points Which set of units is in order of increasing magnitude? 1. mg < dg < cg 2. Mm < km < cm 3. mA < μ A < cA 4. nL < mL < dL correct 5. mW < kW < cW Explanation: 10 9 (nL) < 10 3 (mL) < 10 1 (dL) 004 1.0 points About how many different elements have been discovered? 1. 100 correct 2. 200 3. 1000 4. 50 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. iodine. 2. fluorine. 3. oxygen. 4. neon. correct 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 correct 2. 39 . 7 × 10 5 3. 3 . 97 × 10 3 Version 161 – Homework 2 – Walker – (53970) 2 4. 3 . 97 × 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. Gas volume decreases with increasing pressure. 3. Gases have no definite volume. 4. Gases are not compressible. correct 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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This homework help was uploaded on 03/19/2008 for the course CH 304k taught by Professor Walker during the Spring '08 term at University of Texas.
 Spring '08
 walker
 Chemistry

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