The rate and extent of chemical change: Practice Questions

• a.It increases the kinetic energy of the particles, which increases the rate.
• b.It increases the surface area to volume ratio, which increases the rate.
• c.It decreases the surface area, which decreases the rate.
• d.It lowers the activation energy of the reaction, which increases the rate.

• a.It lowers the pressure of the system, allowing particles to move more freely.
• b.It increases the frequency of collisions and makes the collisions more energetic.
• c.It decreases the activation energy required for the particles to react.
• d.It increases the surface area of the reactants, providing more sites for collision.

• a.Divide the total mass of product formed by the total time taken.
• b.Draw a tangent to the curve at that specific time and calculate its gradient.
• c.Find the y-intercept of the curve and divide it by the x-value.
• d.Calculate the average gradient from the start of the reaction to the end.

• a.\(cm^{3} \cdot s\)
• b.\(g \cdot s\)
• c.\(cm^{3}/s\)
• d.\(s/g\)

• a.There are more particles in the same volume, increasing the frequency of collisions.
• b.The particles are spread further apart, allowing more space for collisions.
• c.The activation energy is lowered, so more collisions are successful.
• d.The particles have more kinetic energy and collide more energetically.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.