A student adds excess magnesium ribbon to $$$10 \mathrm{~cm}^{3}$$$ of $$$0.5 \mathrm{~mol} / \mathrm{dm}^{3}$$$ sulfuric acid. The hydrogen gas produced is collected and its total volume is measured every 10 seconds. The experiment is repeated with $$$5 \mathrm{~cm}^{3}$$$ of $$$0.5 \mathrm{~mol} / \mathrm{dm}^{3}$$$ sulfuric acid added to $$$5 \mathrm{~cm}^{3}$$$ of water using the same mass of magnesium ribbon. Which line on the graph shows the results of the second experiment?

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_22 Year：2024 Question No：13

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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