Four students collect the gas produced from the reaction of calcium carbonate with dilute hydrochloric acid. Each student records the time taken to collect a volume of gas. Which results show the highest average rate of reaction?
A.
\(15 \mathrm{~cm}^{3}\) of gas collected in 20 seconds
B.
\(50 \mathrm{~cm}^{3}\) of gas collected in 40 seconds
C.
\(75 \mathrm{~cm}^{3}\) of gas collected in 80 seconds
D.
\(90 \mathrm{~cm}^{3}\) of gas collected in 100 seconds
Exam No：0620_w24_qp_11 Year：2024 Question No：15
Answer:
B
Knowledge points:
6.2.1.1. changing the concentration of solutions
6.2.1.2. changing the pressure of gases
6.2.1.3. changing the surface area of solids
6.2.1.4. changing the temperature
6.2.1.5. adding or removing a catalyst, including enzymes
6.2.2. State that a catalyst increases the rate of a reaction and is unchanged at the end of a reaction
6.2.3. Describe practical methods for investigating the rate of a reaction including change in mass of a reactant or a product and the formation of a gas
6.2.4. Interpret data, including graphs, from rate of reaction experiments
6.2.5.1. number of particles per unit volume
6.2.5.2. frequency of collisions between particles
6.2.5.3. kinetic energy of particles
6.2.5.4. activation energy
6.2.6.1. changing the concentration of solutions
6.2.6.2. changing the pressure of gases
6.2.6.3. changing the surface area of solids
6.2.6.4. changing the temperature
6.2.6.5. adding or removing a catalyst, including enzymes using collision theory
6.2.7. State that a catalyst decreases the activation energy
6.2.8. Evaluate practical methods for investigating the rate of a reaction including change in mass of a reactant or a product and the formation of a gas
Solution:
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