Multiple Choice
What mass of ammonium thiocyanate (NH4SCN) is required to completely react with 6.5 g of barium hydroxide octahydrate (Ba(OH)2·8H2O) in a chemical reaction?
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7. Energy and Metabolism
Chemical Reactions
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Which of the following statements is true for all exergonic reactions?
A
The products have more total energy than the reactants.
B
The reaction proceeds with a net loss of free energy.
C
The reaction goes only in a forward direction: all reactants will be converted to products.
D
A net input of energy from the surroundings is required for the reactions to proceed.
Verified step by step guidance1
Understand the definition of exergonic reactions: Exergonic reactions are chemical reactions that release energy during the process. This means that the energy of the products is lower than the energy of the reactants.
Identify the key characteristic of exergonic reactions: They proceed with a net loss of free energy, which is a fundamental aspect of these reactions.
Evaluate the statement 'The products have more total energy than the reactants': This is incorrect for exergonic reactions, as they release energy, resulting in products with less energy.
Consider the statement 'The reaction goes only in a forward direction: all reactants will be converted to products': While exergonic reactions tend to proceed forward, not all reactants are necessarily converted to products due to equilibrium dynamics.
Analyze the statement 'A net input of energy from the surroundings is required for the reactions to proceed': This describes endergonic reactions, not exergonic ones, as exergonic reactions release energy rather than require an input.
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