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Question 1

Choose the member of each set that best matches the label.

More covalent N2O, Na2O

Highest electronegativity O, S, Br

1. N2O, Br

2. N2O, O

3. Na2O, S

4. Na2O, O

5. Na2O, BrBottom of Form

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Question 2

Which of the following bonds would be the most polar without being considered ionic?

1. Mg-O

2. C-O

3. O-O

4. Si-O

5. N-OBottom of Form

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Question 3

Which of the following compounds contains one or more covalent bonds?

1. SO2

2. NaBr

3. Rb2O

4. MgBr2

5. MgO

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Question 4

Would NaBr be classified as ionic or covalent?Bottom of Form

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Question 5

Rank the following bonds from least polar to most polar:

Si-Cl, P-Cl, Mg-Cl, and S-Cl

1. S-Cl < P-Cl < Mg-Cl < Si-Cl

2. P-Cl < S-Cl < Si-Cl < Mg-Cl

3. Mg-Cl < Si-Cl < P-Cl < S-Cl

4. Mg-Cl < S-Cl < P-Cl < Si-Cl

5. S-Cl < P-Cl < Si-Cl < Mg-ClBottom of Form

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Question 6

Which of the following elements has the lowest electronegativity?

6. Cs

7. Na

8. Be

9. Se

10. BrBottom of Form

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Question 7

Draw the Lewis electron structure for the sulfur atom.Bottom of Form

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Question 8

Would SF4 be classified as ionic or covalent?Bottom of Form

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Question 9

Write the electron configuration for Al3+.Bottom of Form

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Question 10

Which of the following molecules has a trigonal planar structure?

1. CH4

2. NO3-

3. CO2

4. CO

5. H2

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Question 11

Which of the following has primarily ionic bonding?

1. N2O3

2. Na2O

3. CO2

4. CCl4

5. none of these

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Question 12

True or false? Ionic bonding occurs between atoms with small differences in electronegativities.Bottom of Form

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Question 13

Consider the molecule SO2. Answer the following.

What is the electron arrangement around the central atom?

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Question 14

A oxygen atom needs to gain _____ electrons to achieve a noble gas configuration.

1. 2

2. 1

3. 3

4. 4

5. 5

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Question 15

True or false? N2 is an example of a covalent bond.Bottom of Form

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Question 16

Draw the Lewis structure for SiH4.Bottom of FormTop of Form

Question 17

Draw the Lewis electron structure for the Cl2 molecule.

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Question 18

Which of the following molecules has only nonpolar covalent bonds?

1. N2

2. CO

3. HI

4. CCl4

5. NaCl

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Question 19

Would K2O be classified as ionic or covalent?

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Question 20

Which of the following covalent molecules has a linear structure?

1. SO2

2. CO2

3. OF2

4. SCl2

5. NH2

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Question 21

Which has a trigonal pyramid structure?

1. SO32-

2. CO32-

3. SO3

4. NO3-

5. CH4

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Question 22

True or false? The F- and O2- ions have the same electron configuration.Bottom of Form

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Question 23

1 Point

This molecule contains a carbon atom with trigonal planar geometry.

1. CH3CHO

2. CO2

3. CH3Cl

4. C2H6

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Question 24

Use the following choices to describe the molecular structure of each of the following molecules or ions.

a. linear

b. trigonal planar

c. tetrahedral

d. pyramidal

e. V-shaped

OCl2Bottom of Form

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Question 25

Which element or ion listed below has the electron configuration 1s22s22p63s23p6?

1. S

2. Ne

3. Cl

4. S2-

5. none of these

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Question 26

Which of the following molecules has more than one reasonable resonance structure?

1. CH4

2. CO2

3. PH3

4. HF

5. HCl

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Question 27

Use the following choices to describe the molecular structure of each of the following molecules or ions.

a. linear

b. trigonal planar

c. tetrahedral

d. pyramidal

e. V-shaped

PF3

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Question 28

Which of the following element or ion has the electron configuration 1s22s22p63s23p6?

1. Cl

2. Br-

3. Se

4. Ca2+

5. Two of theseBottom of Form

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Question 29

Draw the Lewis structure for CCl4.Bottom of Form

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Question 30

Consider the molecule SO2. Answer the following.

How many lone pairs of electrons are around the central atom?

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31-Consider the following processes:

2ClF+O2-> Cl2O+F2O	167.4
2ClF3+2O2->Cl2O+3F2O	341.4
2F2+O2->2F2O	–43.4

Calculate enthalpy for the reaction:

ClF3->ClF+F2

1. +217.5 kJ/mol

2. +130.2 kJ/mol

3. +108.7 kJ/mol

4. –217.5 kJ/mol

5. None of these

6.

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Using the following data, calculate the heat of reaction for the reaction,

1/2 Cl2(g) + 1/2 I2(g) → ICl in kJ/mol:

	ΔH° (kJ/mol)
Cl2(g) → 2Cl(g)	242.3
I2(g) → 2I(g)	151.0
ICl(g) → I(g) + Cl(g)	211.3
I2(s) → I2(g)	62.8

1. –211 kJ/mol

2. –14.6 kJ/mol

3. 16.8 kJ/mol

4. 245 kJ/mol

5. 439 kJ/mol

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33-For the reaction

H2+1/2O2->H2O ΔH°=286 kJ/mol

Calculate the enthalpy change when 2.44 g of water is produced.

1. 117 kJ

2. 698 kJ

3. –698 kJ

4. 38.7 kJ

5. –38.7 kJ

34-For the reaction of ethene, C2H4(g), with oxygen(g) to form carbon dioxide(g) and water(g), what number of moles of carbon dioxide can be produced by the reaction of 5.00 mol ethene and 10.2 mol oxygen?

1. 15.3 mol

2. 10.2 mol

3. 6.80 mol

4. 10.0 mol

5. None of these

35-Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. If 3.65 mol of magnesium and 3.65 mol of hydrochloric acid are reacted, how many moles of hydrogen gas are produced?

1. 7.30 mol

2. 1.83 mol

3. 3.65 mol

4. 5.65 mol

5. None of these

36-For the reaction

CaCO3+2HCl->CaCl2+CO2+H2O

how many grams of CaCl2 can be obtained if 43.5 g HCl is allowed to react with excess CaCO3?

1. 132 g CaCl2

2. 265 g CaCl2

3. 0.597 g CaCl2

4. 66.2 g CaCl2

5. none of these

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Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. If 3.75 mol of magnesium and 3.75 mol of hydrochloric acid are reacted, how many grams of excess reactant are left over?

1. 1.88 g

2. 91.2 g

3. 68.4 g

4. 1.37x10^2g

5. 45.6 g

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