The rate expression has a negative sign for?
Correct answer: A. Disappearance of reactants
- A. Disappearance of reactants
- B. Formation of products
- C. A given time
- D. All of these options are correct
Explanation
The rate expression has a negative sign for reactants because the rate of a reaction is defined as the change in the concentration of reactants or products per unit time. Since the concentration of reactants decreases over time in most reactions, the rate of the reaction is negative. However, the rate expression can be positive or negative for products, depending on the specific reaction.
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About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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