General Chemistry Questions

Post ID: 2591820

True

False

Question at position 2

2 points

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Question at position 2

What is the molar mass of water, H₂O?

Answer not shown

18 g/mol

26 g/mol

3 g/mol

Question at position 3

2 points

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Question at position 3

What is the molar mass of water, CO2?

18 g/mol

Answer not shown

26 g/mol

44 g/mol

Question at position 4

4 points

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Question at position 4

Please select all values that equal to 1 mol (select all that apply)

44 grams of CO₂

12.044 * 10²³atoms of oxygen in a sample of oxygen gas

6.022 * 10²³molecules of water

18 grams of H₂O

Question at position 5

4 points

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Question at position 5

Find the mass, in grams of H₂O, of 0.1372 moles of H₂O

Please type just the number in standard notation with the correct# of SF's without the unit below.

Find the mass, in grams of H₂O, of 0.1372 moles of H₂O

Please type just the number in standard notation with the correct# of SF's without the unit below.

Question at position 6

4 points

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Question at position 6

Find the number of moles of H₂O of 2.65 * 10²²molecules of H₂O

Please type just the number in standard notation with the correct# of SF's without the unit below.

Find the number of moles of H₂O of 2.65 * 10²²molecules of H₂O

Please type just the number in standard notation with the correct# of SF's without the unit below.

Question at position 7

4 points

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Question at position 7

Find the mass, in grams of CO₂, of 8.08 x 1023 molecules of CO2

Please type just the number in standard notation with the correct# of SF's without the unit below.

Find the mass, in grams of CO₂, of 8.08 x 1023 molecules of CO2

Please type just the number in standard notation with the correct# of SF's without the unit below.

Question at position 8

4 points

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Question at position 8

Find the number of molecules of NH₃, of 7.53 grams of NH₃

Please type just the number in scientific notation with the correct# of SF's without the unit below.

Write your scientific notation exponent as 10^23 (e.g. 1.49*10^23)

Find the number of molecules of NH₃, of 7.53 grams of NH₃

Please type just the number in scientific notation with the correct# of SF's without the unit below.

Write your scientific notation exponent as 10^23 (e.g. 1.49*10^23)

Question at position 9

4 points

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Question at position 9

A sample contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. The molar mass is 90 g/mol.

The empirical formula isQuestion Blank 1 of 1

Question at position 10

4 points

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Question at position 10

A sample contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. The molar mass is 90 g/mol.

The molecular formula isQuestion Blank 1 of 1

Question at position 11

2 points

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Question at position 11

Consider the following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

Please draw the 5 lewis structures above and upload this to the last question of the exam!

In the Lewis structures ofQuestion Blank 1 of 1

the central atom has one lone pair of electrons.

Question at position 12

2 points

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Question at position 12

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

In the Lewis structures ofQuestion Blank 1 of 1

the central atom has no lone pairs of electrons.

Question at position 13

2 points

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Question at position 13

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

In the Lewis structures ofQuestion Blank 1 of 1

the central atom has three bonds.

Question at position 14

2 points

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Question at position 14

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

In the Lewis structures ofQuestion Blank 1 of 1

the central atom has four bonds.

Question at position 15

2 points

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Question at position 15

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

In the Lewis structures ofQuestion Blank 1 of 1

the molecular VSEPR shape is tetrahedral.

Question at position 16

2 points

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Question at position 16

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

In the Lewis structures ofQuestion Blank 1 of 1

the molecular VSEPR shape is trigonal pyramidal.

Question at position 17

2 points

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Question at position 17

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

Question Blank 1 of 1

are polar molecules.

Question at position 18

2 points

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Question at position 18

Consider the same following species when answering the questions that follow:

(i) PF3 (ii) CH2F2 (iii) BH3 (iv) CF4 (v) NH3

Question Blank 1 of 1

are nonpolar molecules.

Question at position 19

10 points

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Question at position 19

Explain how to name an ionic compound that has a transition metal that can have multiple charges.

Your answer should contain (1) the name and formula of the compound and (2) reasoning for the writing the name and formula as such

You may upload a video or essay with audio (the formulas and names must be written)

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Explain how to name an ionic compound that has a transition metal that can have multiple charges.

Your answer should contain (1) the name and formula of the compound and (2) reasoning for the writing the name and formula as such

You may upload a video or essay with audio (the formulas and names must be written)

12pt

Paragraph

0 words

Question at position 20

10 points

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Question at position 20

Explain how to calculate the number of oxygen atoms (not molecules) in a sample that contains 46.2 grams of oxygen.

Your answer must contain an explanation as to how you calculate the problem, including what conversion factors you used, and the final answer with units and the correct number of significant figures.

You may upload a video/audio/essay.

There is a word count below the text area.Display keyboard shortcuts for Rich Content Editor

Explain how to calculate the number of oxygen atoms (not molecules) in a sample that contains 46.2 grams of oxygen.

Your answer must contain an explanation as to how you calculate the problem, including what conversion factors you used, and the final answer with units and the correct number of significant figures.

You may upload a video/audio/essay.

12pt

Paragraph

0 words

Question at position 21

10 points

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Question at position 21

Please state both the VSEPR shapes and polarity for (1) BF3 and (2) NF3

Your answer should have the lewis structure drawn for both structures, with the VSEPR electronic and molecular geometries, along with the polarity of the molecule as well as the bond polarities.

You may upload an essay/video/audio with a photo (JPEG or PDF) of the lewis structures

There is a word count below the text area.Display keyboard shortcuts for Rich Content Editor

Please state both the VSEPR shapes and polarity for (1) BF3 and (2) NF3

Your answer should have the lewis structure drawn for both structures, with the VSEPR electronic and molecular geometries, along with the polarity of the molecule as well as the bond polarities.

You may upload an essay/video/audio with a photo (JPEG or PDF) of the lewis structures

12pt

Paragraph

0 words

Question at position 22

10 points

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Question at position 22

This is your last question before you need to upload your scratch work.

Please select one molecule that has resonance and do the following:

1. Write the formula and name of the compound (molecule you selected)

2. Draw out the resonance lewis structures

3. Explain why the compound has resonance

You may upload a essay/video/audio with a photo (JPEG or PDF) of the lewis structures.