GASES, LIQURDS AND SOLL Understanding concept A small amount of acetonitrile (CH
ID: 571207 • Letter: G
Question
GASES, LIQURDS AND SOLL Understanding concept A small amount of acetonitrile (CH,CN) is dissolved in a large amount of formaldehyde (H,co). 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.) CHCN H2CO solution Use these sketches to answer the questions in the table below The enthalpy of Solution // soln is positive when CH3CN dissolves in formaldehyde. Use this information to list the stages in order of increasing enthalpy absorbed Would heat be absorbed or released if the system moved from Stage A to B? released ionic boning force covalent bonding foroe metal bonding force What force would oppose or favor the system moving from Stage A to B? Check all that apply dipole force Oion-dipole force CheckExplanation / Answer
From stage A to B what has happened is a small portion of A is taken in Stage B and amount of B remains same. The two substances are not mixed yet which is done in stage D.So till now no reaction or mixing of the substances has occurred.However energy will be required to seperate the solute molecules from the rest portion from which it is seperated.So heat will be absorbed.
The forces of attraction are dipole forces as CH3CN is polar and has a net dipole due to strong electronegative N atom in it.Also there may be some london dispersion forces of attraction.So answer is dipole force and dispersion force.
Comment in case of any doubt.
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