Questions and Answers
What is the definition of chemical equilibrium?
Chemical equilibrium is the point at which the rate of the forward reaction equals the rate of the reverse reaction.
Does a chemical reaction actually stop once equilibrium is reached?
False
Which reaction will make more products: Reaction A with an equilibrium constant equal to 1213 M or Reaction B with an equilibrium constant equal to 0.344 M²?
Reaction A will make more products.
What is wrong with the statement that some chemical reactions are equilibrium reactions and some are not?
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Why do we ignore solids in the equilibrium constant when using Le Chatelier's principle?
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Why are acid ionization reactions important in chemistry?
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What is the range of the pH scale?
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Which is (are) the acidic solution(s) among the following: Solution A (pH = 1), Solution B (pH = 10), Solution C (pH = 7)?
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Which solution is made with the acid that has the lowest ionization constant among the following: Solution A (pH = 1), Solution B (pH = 4), Solution C (pH = 6)?
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Where does acid rain come from?
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Study Notes
Chemical Equilibrium
- Chemical equilibrium occurs when the forward and reverse reaction rates are equal.
- Reactions do not completely stop at equilibrium; they continue to occur in dynamic balance.
Equilibrium Constants
- Reaction A: equilibrium constant = 1213 M, signifies a predominance of products.
- Reaction B: equilibrium constant = 0.344 M², indicates fewer products compared to Reaction A.
Misconception About Reaction Arrows
- All chemical reactions are equilibrium reactions, regardless of notation with single or double arrows.
- Single arrows are often used for reactions with very high equilibrium constants, implying negligible reactants.
Solids in Equilibrium
- Solid concentrations do not change during a reaction, making them irrelevant in the equilibrium constant calculations.
Acid Ionization
- Acid ionization reactions are crucial for determining an acid's strength.
pH Scale
- The pH scale ranges from 0 (high acidity) to 14 (high alkalinity).
- A pH of 7 is neutral.
Acidic Solutions
- Among solutions with pH values provided, Solution A (pH = 1) is classified as acidic.
Ionization Constants in Acids
- In three acid solutions of equal concentration, Solution C (pH = 6) has the lowest ionization constant, indicating it is the weakest acid.
Sources of Acid Rain
- Acid rain results from pollutants such as sulfur trioxide and nitrogen dioxide that react with water, forming various acids.
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Description
Test your understanding of chemical equilibrium concepts with this quiz based on Module 15. Explore definitions, reactions, and the nature of chemical processes as you assess your knowledge on this essential topic in chemistry.
