Powdered magnesium carbonate is added to excess dilute hydrochloric acid. The total volume of gas produced is measured over time. A graph of the results is shown. The experiment is repeated but the concentration of the hydrochloric acid is doubled. All other conditions are kept the same. Which statements about the second experiment are correct? 1 The final volume of gas is $$$360 \mathrm{~cm}^{3}$$$. 2 The reaction finishes before 90 seconds. 3 The activation energy of the reaction is lower.

1 and 2

1 and 3

2 and 3

2 only

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_21 Year：2024 Question No：18

Answer:

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

Answer:

Knowledge points:

Solution:

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