Chemistry Practice Problems Types of Chemical Reactions Practice Problems Solution: Neurotransmitters are molecules that are released ...

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Solution: Neurotransmitters are molecules that are released by nerve cells to other cells in our bodies, and are needed for muscle motion, thinking, feeling, and memory. Dopamine is a common neurotransmitter in the human brain.Predict what kind of reaction dopamine is most likely to undergo in water: redox, acid-base, precipitation, or metathesis?

Problem

Neurotransmitters are molecules that are released by nerve cells to other cells in our bodies, and are needed for muscle motion, thinking, feeling, and memory. Dopamine is a common neurotransmitter in the human brain.

The structure of benzene is a six-carbon hexagon arranged with its points up and down.  The sides of the hexagon are alternating double and single bonds, with the left side being the first double bond.  The top and bottom point and lower right vertex are all single bonded to H.  The upper and lower left vertices are single bonded to OH.  The upper right vertex is single bonded to C, which is single bonded above and below to H and right to C.  That C is single bonded above and below to H and right to N, which is single bonded to two Hs.

Predict what kind of reaction dopamine is most likely to undergo in water: redox, acid-base, precipitation, or metathesis?

Solution

We’re asked to predict what kind of reaction dopamine is most likely to undergo in waterredox, acid-base, precipitation, or metathesis.


Recall the different types of reactions:

  • redox reactions → reactants undergo reduction and oxidation in a single reaction:
    • one reactant undergoes oxidation (loss of electrons) → reducing agent
    • another reactant undergoes reduction (gain of electrons)  oxidizing agent
  • methathesis → a double displacement reaction where ions from each reactant (ionic compounds) swap ions with each other
    • acid-base reaction → a type of double displacement reaction also known as neutralization reaction where an acid reacts with a base to form an ionic salt and water
    • precipitation reaction double displacement reaction that forms an insolube ionic compound (precipitate) as a product


First, we need to determine if dopamine is an ionic compound


Recall that ionic compounds contain a positive ion (cation) from a metal and a negative ion (anion) from a nonmetal.

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