Video Transcript
When a reaction mixture is heated,
the particles collide more frequently. Which of the following is the best
explanation of this effect? (A) The particles get closer
together. (B) The particles move faster. (C) The particles get larger. (D) The particles break apart. (E) The particles exert stronger
attractive forces.
Say we have a box containing gas
particles at room temperature. The gas particles move around,
colliding with each other and the walls of the box. If we heat the gas to a higher
temperature, the particles in the container will move faster. This is because heating increases
the kinetic energy of the particles. If the particles are moving more
quickly, there will be more collisions between particles. This is important because reactant
particles must collide to form the products. This means that if a reaction
mixture is heated, the reaction will occur more quickly because there are more
collisions occurring between particles. In other words, the rate of
reaction is greater when a reaction mixture is heated.
Though we used an example of a gas
here, it’s worth noting that this also applies to solids, liquids, and aqueous
solutions. When a reaction mixture is heated,
the particles collide more frequently because the particles are moving faster. So, answer choice (B) is the
correct answer.
