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OK STATE / Engineering / CHEM 1314 / Is sodium sulfide ionic?

Is sodium sulfide ionic?

Is sodium sulfide ionic?

Description

School: Oklahoma State University
Department: Engineering
Course: General Chemistry
Professor: Jimmie weaver
Term: Winter 2016
Tags: Chemistry
Cost: 50
Name: Chem 1314 Study Guide test 1
Description: Study guide for the first test
Uploaded: 01/30/2016
4 Pages 46 Views 4 Unlocks
Reviews

Rasheed Lebsack (Rating: )

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!



Exam 1 Review


Is sodium sulfide ionic?



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) → Mg3N2 (s)

b) S8(g) + 8O2(g) → 8SO2 (g)

c) 2C6H14(l) + 19O2(g) → 12CO2 (g) + 14H2O(g)

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


What makes potassium flouride ionic?



Don't forget about the age old question of What is the formula of substitution method?

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

5.66 x 10-11 

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


Why does sodium react to water immediately?



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

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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

 Na2SO4

b) iron and bromide (there are 2 possible formulas for this, only write one)  FeBr2  We also discuss several other topics like Does segregation still exist in the united states?

c) carbon and fluorine

 CF4

d) aluminum and sulfur

 Al2S3

e) silver and carbonate

 Ag2CO3

f) nitrogen and oxygen

 NO2

5. Fill the blanks in the table below:  

Name of compound

Formula of compound

Ionic or covalent?

sodium sulfide

Na2S

Ionic

Iron (III) Bromide

FeBr3

Ionic

Phosphorous pentachloride

PCl5

Covalent

Sulfuric Acid

H2SO4(aq)

don’t worry about this one

Potassium Fluoride

KF

Ionic

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Don't forget about the age old question of How do acids and bases affect how we function?

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

7131Ga

40

31

31

6931Ga

38

31

31

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7. Complete each calculation and report the answer to the correct number of significant figures.  a) (3.05 x 1020)/(8.340 x 1024) = 3.66x 10-5 

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  (g/mol)

m, mass of  

sample (g)

n, moles of  

sample

N, number of  

atoms or formula  units

P2O5

142

284

2.00

1.2x1024 f.u

X

95.94

8.478

8.84x10-2

5.32 x 1022atoms

NaBrO3

151

.484

3.21 x 10-3

1.93x1021 f.u

284 (�� ������ 

��������)= 2.00mol 2.00mol (��.����������^���� ������ 

��������)= 1.20x1024 f.u

5.32x1022atoms (�� ������ 

��.����������^���� ������)= 8.84x10-2 mol (��.�������� 

��.����������−��������)= 95.94g  

3.21x10-3mol (�������� 

�� ������)= .484g 3.21x10-3mol (��.����������^���� ������ 

��������)= 1.93x1021 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 x 1023 atoms Au

1 mol Au

a. 3.27 x 10-22 grams 

b. 3.06 x 1021 grams

c. 1.79 x 10-21 grams

d. 1.31 x 10-22 grams

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