HW 1 Atomic Theory - roberts (eer474) Homework 1: Atomic...

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Unformatted text preview: roberts (eer474) Homework 1: Atomic Theory Shear (52375) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. This homework includes some questions that test basic chemistry knowledge. Some may need you to look things up like atomic masses, fundamental constants, and unit con- versions. Here are some that you may need: c = 3 . 00 10 8 m/s h = 6 . 626 10- 34 J s m e = 9 . 11 10- 31 kg N A = 6 . 022 10 23 mol- 1 E = R parenleftbigg 1 n 2 1- 1 n 2 2 parenrightbigg where R =- 2 . 178 10- 18 J n ( x ) = parenleftbigg 2 L parenrightbigg 1 2 sin parenleftBig nx L parenrightBig E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , 001 10.0 points Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to elements? 1. only water 2. iron and silicon 3. radon and ammonia 4. chromium and water 5. water and ammonia correct Explanation: Water (H 2 O) and ammonia (NH 3 ) are com- posed of more than one element and are com- pounds. 002 10.0 points Identify the symbols for the elements phos- phorus, potassium, silver, chlorine, and sul- fur, in that order. 1. Ph, K, Ag, S, Cl 2. K, Ag, Po, Cl, S 3. P, K, Ag, Cl, S correct 4. P, Po, Ag, Cl, S 5. Ph, Po, Ag, Al, S Explanation: The symbol for phosphorus is P, for potas- sium K, for silver Ag, for chlorine Cl, and for sulfur S. 003 10.0 points Convert 45 micrograms to grams. 1. 4 . 5 10 10 g 2. 4 . 5 10 7 g 3. 4 . 5 10- 11 g 4. 0.045 g 5. 45000 g 6. 4 . 5 10- 5 g correct 7. 4 . 5 10- 8 g 8. 4 . 5 10 13 g Explanation: 45 micrograms parenleftbigg 1 g 10 6 g parenrightbigg = 4 . 5 10- 5 g 004 10.0 points Find the molar mass for Ba(OH) 2 . 1. 172.34 g/mol 2. 170.32 g/mol 3. 153.31 g/mol 4. 171.35 g/mol correct roberts (eer474) Homework 1: Atomic Theory Shear (52375) 2 5. 155.33 g/mol Explanation: molar mass of Ba(OH) 2 = ? 1 mol Ba 137.33 g Ba mol Ba = 137.33 g 2 O mol 16.00 g O mol O = 32.00 g 2 mol H 1.01 g O mol H = 2.02 g Molar mass = 171.35 g /mol 005 10.0 points Balance the equation ? CS 2 + ? O 2 ? CO 2 + ? SO 2 What are the coefficients? 1. 2, 1, 2, 1 2. 1, 2, 1, 2 3. 2, 1, 1, 2 4. 1, 2, 3, 1 5. 2, 2, 1, 1 6. 1, 2, 1, 1 7. 1, 3, 1, 2 correct Explanation: C is balanced. O is not balanced, but because it is in both products, we will leave that until the end. Lets start with S. There are 2 S on the left and 1 S on the right so we will add one more S on the right.will add one more S on the right....
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HW 1 Atomic Theory - roberts (eer474) Homework 1: Atomic...

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