Collision theory and activation energyIB MYP Chemistry: Mind map

Exam questions on Collision theory and activation energy

1. A class in Kuala Lumpur uses a model in which students walk around a hall as particles. Pairs of students sometimes collide, but only some of the collisions are counted as a reaction.
   State two conditions that must be met for a collision between particles to be successful.2 marks
2. A pupil in Chennai reacts magnesium ribbon with dilute hydrochloric acid. She then repeats the experiment with a more concentrated acid, and later with the original acid warmed to a higher temperature.
   Explain, using ideas about collisions, why the rate of this reaction falls as it proceeds.2 marks
3. A brewery in Dublin uses yeast to convert sugar into ethanol and carbon dioxide at about 30 °C. Yeast cells contain enzymes. The company's chemical plant next door makes other products using metal catalysts.
   Explain how a catalyst increases the rate of a reaction.3 marks