In the reaction between marble chips and hydrochloric acid, the rate can be followed by measuring
Correct answer: A. the mass of the flask, which falls as carbon dioxide escapes
- A. the mass of the flask, which falls as carbon dioxide escapes
- B. the colour of the acid
- C. the temperature of the marble
- D. the mass of the flask, which rises as gas is produced
Explanation
Carbon dioxide leaves the open flask, so the total mass decreases steadily and the loss per unit time is a direct measure of the rate. The alternative method is to collect the gas in a syringe and record its volume at fixed intervals. Mass could never increase, since nothing is entering the flask from outside.
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About Rate of Reaction
Reaction rate measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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