chem hmwrk 1 - armagon (aa28888) – Homework 1 – cowley...

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Unformatted text preview: armagon (aa28888) – Homework 1 – cowley – (89959) 1 This print-out should have 51 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points How many oxygen atoms are present in a formula unit of calcium acetate? 1. 3 2. 2 3. 5 4. 4 5. 1 002 10.0 points A vat of hydrogen peroxide (H 2 O 2 ) contains 455 grams of oxygen atoms. How many molecules of (H 2 O 2 ) are in the vat? 1. 1 . 71 × 10 25 molec 2. 484 molec 3. 2 . 19 × 10 27 molec 4. 2 . 52 × 10 23 molec 5. 4 . 28 × 10 24 molec 6. 8 . 56 × 10 24 molec 003 10.0 points Which of the following species has the greatest number of electrons? 1. Ca 2+ 2. Cu 2+ 3. Mn 4. Ni 3+ 5. Ti 2- 004 10.0 points What is the correct order of increasing en- ergy? 1. microwaves, visible light, ultraviolet light, x-rays, γ-rays 2. ultraviolet light, visible light, microwaves, x-rays, γ-rays 3. x-rays, γ-rays, microwaves, visible light, ultraviolet light 4. microwaves, ultraviolet light, visible light, x-rays, γ-rays 5. microwaves, x-rays, γ-rays, visible light, ultraviolet light 005 10.0 points How many moles of hydrogen are contained in 3.00 moles of ethanol (CH 3 CH 2 OH)? 1. 6 . 02 × 10 23 mol 2. 3 . 00 × 10 23 mol 3. 6.00 mol 4. 3 . 00 × 3 . 61 × 10 24 mol 5. 3 . 61 × 10 24 mol 6. 1.00 mol 7. 3 . 00 × 6 . 02 × 10 23 mol 8. 18.00 mol 9. 3.00 mol 10. 1 . 00 × 10 23 mol 006 10.0 points An element that is considered to be unreactive because it has a filled outer energy level is 1. hydrogen. armagon (aa28888) – Homework 1 – cowley – (89959) 2 2. silver. 3. helium. 4. lithium. 007 10.0 points Consider the reaction CaCN 2 + 3 H 2 O → CaCO 3 + 2 NH 3 . How much CaCO 3 is produced if 47.5 moles NH 3 are produced? 1. 0.950 g 2. 0.238 g 3. 2380 g 4. 4750 g 5. 23.8 g 6. 9500 g 008 10.0 points A substance has a molar mass of 60 g/mol with 40.0 percent carbon, 6.7 percent hydro- gen, and 53.3 percent oxygen. What is its empirical formula? 1. C 2 HO 2. CHO 2 3. C 2 H 4 O 2 4. CH 2 O 5. C 2 H 2 O 3 6. C 3 H 3 O 2 7. C 2 H 3 O 2 8. CHO 9. C 3 H 2 O 2 009 10.0 points Which is NOT true about light? 1. X-rays and visible light both travel at the same speed. 2. It can behave like either particles or waves. 3. The energy of a photon is directly propor- tional to its wavelength. 4. As the frequency of light increases, the wavelength decreases. 010 10.0 points The reaction of 9 . 7 grams of fluorine with excess chlorine produced 3 . 9 grams of ClF 3 ....
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This note was uploaded on 07/20/2009 for the course CH 90262 taught by Professor Mccord during the Summer '09 term at University of Texas.

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chem hmwrk 1 - armagon (aa28888) – Homework 1 – cowley...

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