The reason as to why the use of a 50:50 mixture of water and ethylene glycol is used as an antifreeze and coolant in automobile engines is to be stated. Concept introduction: Antifreeze or coolant is used in car radiators to avoid heating. Although, antifreeze is a common chemical, but it is very harmful and should be handled with care.

Question

A small amount of acetonitrile (CH3CN) is dissolved in a large amount of formaldehyde (H₂CO). Imagine separating this process into the four stages sketched below. (These sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.) B CH₂CN H₂CO Use these sketches to answer the questions in the table below. The enthalpy of solution AH is positive when soln CH3CN dissolves in formaldehyde. Use this information to list the stages in order of increasing enthalpy. Would heat be absorbed or released if the system moved from Stage C to D? What force would oppose or favor the system moving from Stage C to D? Check all that apply. 8 48000 ed O absorbed O released O neither absorbed nor released Onone ionic bonding force O covalent bonding force metal bonding force Ⓒhydrogen-bonding force dipole force Oion-dipole force dispersion force 0.0.. solution

Answer 1

Question

Chapter 7, Problem 7.38E

Interpretation Introduction

Interpretation:

The reason as to why the use of a 50:50 mixture of water and ethylene glycol is used as an antifreeze and coolant in automobile engines is to be stated.

Concept introduction:

Antifreeze or coolant is used in car radiators to avoid heating. Although, antifreeze is a common chemical, but it is very harmful and should be handled with care.

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A small amount of acetonitrile (CH3CN) is dissolved in a large amount of formaldehyde (H₂CO). Imagine separating this process into the four stages sketched below. (These sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.) B CH₂CN H₂CO Use these sketches to answer the questions in the table below. The enthalpy of solution AH is positive when soln CH3CN dissolves in formaldehyde. Use this information to list the stages in order of increasing enthalpy. Would heat be absorbed or released if the system moved from Stage C to D? What force would oppose or favor the system moving from Stage C to D? Check all that apply. 8 48000 ed O absorbed O released O neither absorbed nor released Onone ionic bonding force O covalent bonding force metal bonding force Ⓒhydrogen-bonding force dipole force Oion-dipole force dispersion force 0.0.. solution

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