The meaning of aromatic hydrocarbons ; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated. Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons. All the carbon atoms and C − C bonds are equivalent in the benzene ring. To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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3. 2. 1. On the graph below, plot the volume of rain in milliliters versus its height in centimeters for the 400 mL beaker. Draw a straight line through the points and label it "400 mL beaker." Volume (mL) 400 350 300 250 200 150 750 mL Florence Volume Versus Height of Water 400 mL beaker 100 50 0 0 2 3 4 5 Height (cm) 6 7 8 9 10 Explain why the data points for the beaker lie roughly on a straight line. What kind of relationship is this? How do you know? (see page 276 text) the design of the beaker is a uniform cylinder the volume of liquid increases evenly with its height resulting in a linear relationship. What volume would you predict for 10.0 cm of water? Explain how you arrived at your answer. Use the data table and the graph to assist you in answering the question. 4. Plot the volume of rain in milliliters versus its height in centimeters for the 250 mL Florence flask on the same graph. Draw a best-fit curve through the points and label it "250 mL Florence flask." oke came

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In the video, we looked at the absorbance of a certain substance and how it varies depending on what wavelength of light we are looking at. Below is a similar scan of a different substance. What color BEST describes how this substance will appear? Absorbance (AU) Violet Blue Green Orange 1.2 1.0- 0.8- 0.6- 0.4- 0.2 0.0 450 500 550 600 650 700 Wavelength (nm) violet indigo blue green yellow orange red Red O Cannot tell from this information In the above graph, what causes -450 nm wavelength of light to have a higher absorbance than light with a -550 nm wavelength? Check all that are true. The distance the light travels is different The different data points are for different substances The concentration is different at different times in the experiment Epsilon (molar absortivity) is different at different wavelengths

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Answer 3

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Answer 4

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction