FINAL 07 2020, questions and answers PDF

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Module_1_ Ch_04...

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6/13/2020

Module #1: Ch 04

Module #1: Ch 04 Due: 11:59pm on Thursday, July 1, 2021 You will receive no credit for items you complete after the assignment is due. Grading Policy

Activity: Diversity of Carbon-Based Molecules

Click here to complete this activity. Then answer the questions.

Part A How do these hydrocarbons differ?

ANSWER:

One of these hydrocarbons has a double bond. These hydrocarbons are identical. One of these hydrocarbons is longer than the other. One of these hydrocarbons is branched. One of these hydrocarbons has a ring structure.

Correct The hydrocarbon on the right is longer than the hydrocarbon on the left.

Part B How do these hydrocarbons differ?

ANSWER:

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Module #1: Ch 04

One of these hydrocarbons has a double bond. One of these hydrocarbons is branched. One of these hydrocarbons is longer than the other. These hydrocarbons are identical. One of these hydrocarbons has a ring structure.

Correct The hydrocarbon on the right is branched.

Part C How do these hydrocarbons differ?

ANSWER: One of these hydrocarbons has a ring structure. One of these hydrocarbons is branched. One of these hydrocarbons has a double bond. One of these hydrocarbons is longer than the other. These hydrocarbons are identical.

Correct The hydrocarbon on the right has a double bond.

Part D How do these hydrocarbons differ?

ANSWER:

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Module #1: Ch 04

One of these hydrocarbons has a ring structure. One of these hydrocarbons is branched. The hydrocarbon on the left contains more carbon atoms than the hydrocarbon on the right. These hydrocarbons are identical. One of these hydrocarbons has a double bond.

Correct The hydrocarbon on the right has a ring structure.

Part E How many hydrogen atoms can be attached to carbon A?

ANSWER:

0 3 1 4 2

Correct A carbon atom can form up to four covalent bonds.

Part F How many hydrogen atoms can be attached to carbon B?

ANSWER:

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Module #1: Ch 04

1 2 3 4 0

Correct The carbon atom has 4 valence electrons. Out of these, one is already occupied in the structure in a bond with a carbon. Thus, three places are available for hydrogen to form bond.

Chapter 4 Pre-Lecture Question 4 Part A The large diversity of shapes of biological molecules is possible because of the extensive presence of _____ in the molecules.

Hint 1. Consider the electron configuration of the atoms of the organic molecules found in living systems.

ANSWER:

nitrogen oxygen hydrogen sulphur carbon

Correct With four electrons to share, carbon-based molecules can be multibranching and three-dimensionally variable.

Activity: Functional Groups

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Module #1: Ch 04

Click here to complete this activity. Then answer the questions.

Part A Which one of these is an amino group?

ANSWER:

C A D B E

Correct This is an amino group, NH2.

Part B Which of these is a phosphate group?

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Module #1: Ch 04

ANSWER:

C A F B E

Correct Of the choices, this is the only one that contains phosphorus.

Part C Which of these is a hydroxyl group?

ANSWER:

A C F D E

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Module #1: Ch 04

Correct This is a hydroxyl group.

Part D Which of these is a carboxyl group?

ANSWER:

B A C E F

Correct This is a carboxyl group.

Part E Which of these functional groups is characteristic of alcohol?

ANSWER:

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Module #1: Ch 04

A C D B E

Correct Hydroxyl groups are characteristic of alcohol.

Part F Which of the functional groups behaves as a base?

ANSWER:

B C E A F

Correct The electronegativity of nitrogen means that amino groups tend to pick up hydrogen ions.

Part G Which of these groups is characteristic of thiols?

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Module #1: Ch 04

ANSWER:

D E B A F

Correct Thiols are characterized by the presence of a sulfhydryl group.

Part H Which of these groups plays a major role in energy transfer?

ANSWER:

A E C B D

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Module #1: Ch 04

Correct Phosphate groups are a component of ATP.

Part I Which of these is a carbonyl group?

ANSWER:

A E B F C

Correct This is a carbonyl group.

Part J Which of these functional groups is characteristic of a ketone?

ANSWER:

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Module #1: Ch 04

A B C D E

Correct A carbonyl group in the middle of a carbon skeleton characterizes ketones.

Part K Which of functional groups listed below behaves as an acid?

ANSWER:

C E A F D

Correct By donating hydrogen ions, carboxyl groups act as an acid.

Chapter 4 Pre-Lecture Question 9 Part A Variations in the reactive properties of different organic molecules are most closely associated with _____.

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Module #1: Ch 04

Hint 1. What part of a molecule is most likely to react with other molecules?

ANSWER:

the number of asymmetric carbon atoms present the number of carbon atoms comprising the molecule's skeleton the orientation of the carbon skeleton, as either ringed or linear the presence or absence of double bonds the presence or absence of functional groups

Correct Functional groups are the most common participants in chemical reactions.

Chapter 4 Question 4

Part A Which of the following hydrocarbons has a double bond in its carbon skeleton? ANSWER:

C2H6 C3H8 C2H2 CH4 C2H4

Correct

Chapter 4 Pre-Lecture Question 8 Part A Citric acid makes lemons taste sour. Which of the following is a functional group that would cause a molecule such as citric acid to be acidic?

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Module #1: Ch 04

Hint 1. Consider which of these functional groups is a source of hydrogen ions.

ANSWER:

carbonyl hydroxyl amino hydrocarbon carboxyl

Correct The carboxyl group can release a hydrogen ion when in solution.

Chapter 4 Question 2

Part A Which functional group is not present in this molecule?

ANSWER:

amino carboxyl sulfhydryl hydroxyl

Correct

Score Summary: Your score on this assignment is 95.4%. You received 16.22 out of a possible total of 17 points.

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