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Chem 1314 Study Guide test 1

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by: Morgan Walker

Chem 1314 Study Guide test 1 Chem 1314

Marketplace > Oklahoma State University > Chemistry > Chem 1314 > Chem 1314 Study Guide test 1
Morgan Walker
OK State
GPA 3.2

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Study guide for the first test
General Chemistry
Dr. Jimmie Weaver
Study Guide
50 ?




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1 review
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"If Morgan isn't already a tutor, they should be. Haven't had any of this stuff explained to me as clearly as this was. I appreciate the help!"
Rasheed Lebsack

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This 4 page Study Guide was uploaded by Morgan Walker on Saturday January 30, 2016. The Study Guide belongs to Chem 1314 at Oklahoma State University taught by Dr. Jimmie Weaver in Winter 2016. Since its upload, it has received 88 views. For similar materials see General Chemistry in Chemistry at Oklahoma State University.

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If Morgan isn't already a tutor, they should be. Haven't had any of this stuff explained to me as clearly as this was. I appreciate the help!

-Rasheed Lebsack


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Date Created: 01/30/16
Exam 1 Review CHEM 1314 Spring 2016 1. Write the chemical formula(s) of the product(s) and balance all of the following reactions. Identify all products phases as either (g)as, (l)iquid, (s)olid or (aq)ueous a) 3Mg(s) + N2(g) → Mg N3(2) b) S8(g) + 8O2(g) → 8SO (2) c) 2C6H14(l) + 19O2(g) → 12CO (g2 + 14H O(2) d) 2K(s) + Cl2(g) → 2KCl (s) 2. Perform the following conversions. Be sure your answer has the correct number of significant figures. a) 400. cm3 to liters 400cm3 1mL 1L .400L 1cm3 1000mL b) the volume of a ball is 2.00 ft3. Convert to km3. (use at least 3 conversions factors.) 2.00ft3 (12 in)3 (2.54cm)3 (1 meter)3 (1 km)3 (1ft)3 (1 inch)3 (100cm)3 (1000meters)3 -11 5.66 x 10 c) What is 10.0 Kelvin on the Fahrenheit scale? 10k= celcius+ 273.15 celcius= 10K=273.15 =-263.15C F= 9/5 * -263.15+32 = -441.8 F 3. A particular homogeneous mixture of ethanol (C2H6O) and water has a density of 0.945 g · ml-1. This ethanol solution is also 36.0% (by mass) ethanol. The density of pure ethanol is 0.789 g · ml-1. a) A sample of this ethanol solution has a mass of 250. g, calculate the volume of the solution. 250g ethanol 1mL ethanol 265 mL of ethanol .945g ethanol b) How many grams of water and ethanol are in the sample in a)? 250g ethanol 36.0g pure ethanol 90g pure ethanol 100 g ethanol solution 250g ethanol solution-90g pure ethanol=160g of water 4. Predict a reasonable formula for the compound formed from each of the following combinations of elements or polyatomic ions. a) sodium and sulfate Na 2O 4 b) iron and bromide (there are 2 possible formulas for this, only write one) FeBr 2 c) carbon and fluorine CF 4 d) aluminum and sulfur Al2S3 e) silver and carbonate Ag2CO 3 f) nitrogen and oxygen NO 2 5. Fill the blanks in the table below: Name of compound Formula of compound Ionic or covalent? sodium sulfide Na 2 Ionic Iron (III) Bromide FeBr3 Ionic Phosphorous pentachloride PCl 5 Covalent Sulfuric Acid H 2O (4q) don’t worry about this one Potassium Fluoride KF Ionic 6. The relative weighted average atomic mass of gallium is 69.723 u. Gallium has two naturally occurring isotopes. One of those isotopes has a mass of 70.9247 u and a percent abundance of 39.89%. 1-.3989= .6011 a) Calculate the mass of the other isotope of gallium. X=68.93u 69.723u= (70.9247u)(.3989)+x(.6011) 69.723u=28.292+x(.6011) -28.292 41.431u=x(.6011)/(.6011) b) How many neutrons, protons and electrons are in each of the isotopes of gallium? isotope Neutrons Protons Electrons 71 31Ga 40 31 31 6931Ga 38 31 31 7. Complete each calculation and report the answer to the correct number of significant figures. 20 24 -5 a) (3.05 x 10 )/(8.340 x 10 ) = 3.66x 10 b) (1/65) + (1/1234) = .016 .1538+.00081037 c) (8.34 · 0.450) – (2.001/ 0.83) = 1.3 3.753-2.4108 8. Complete the table: Formula M, Molar mass m, mass of n, moles of N, number of (g/mol) sample (g) sample atoms or formula units P2O5 142 284 2.00 1.2x10 f.u -2 22 X 95.94 8.478 8.84x10 5.32 x 10 atoms NaBrO3 151 .484 3.21 x 10 -3 1.93x10 f.u 284 (???? ????????)= 2.00mol 2.00mol ( ????.????????????????????^???????? )= 1.20x10 24f.u ???????????????? ???????????????? ???? ???????????? ????.???????????????? 5.32x10 atoms ( ????.????????????????????^???????? ???????????? 8.84x10 mol ????.????????????????????????????????????)= 95.94g -3 ???????????????? -3 ????.????????????????????^???????? ???????????? 21 3.21x10 mol ???? ????????????= .484g 3.21x10 mol ( ???????????????? )= 1.93x10 f.u 9. Which of the following metals reacts with water immediately? a. Sodium b. Aluminum c. Mercury d. Copper e. Gold 10. What is the mass of one atom of gold? 1 atom Au 1 mol Au 196.97g Au 6.022 x10 atoms Au 1 mol Au a. 3.27 x 10-22grams b. 3.06 x 10 grams -21 c. 1.79 x 10 grams d. 1.31 x 10-22grams


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