Collisions, surface area and rate of reactions

Which of the following statements is correct?

• There are many particles available at the end of the reaction.

• There are many particles colliding at the start of the reaction.

• Reaction slows down when many particles are colliding.

• Reaction is faster when there are few collisions among particles.

• All of the above

Based on the video on collision theory, which of the following is NOT a criterion for a reaction to successfully occur?

• correct orientation

• particles have sufficient energy

• particles must collide

• particles must have large surface area

What happens to the surface area of a solid reactant when it is cut into smaller pieces?

• smaller

• larger

• medium

• all of these

According to the video "Effect of surface area on rate", how is the rate of a chemical reaction determined?

• the sufficient amount of kinetic energy of particles

• the relative sizes of the solid reactants

• the frequency of changing the reactants

• the frequency of successful collisions

According to the "Effect of surface area on rate", the particles can react from within the solid reactant. True or False?

• True

• False. Particles can react entirely.

• False. Particles can only react on its surface.

• False. Reaction cannot be accountable in solids.

According to the video "Effect of surface area on rate", smaller sized blocks have smaller surface area. True or false?

• True

• False. The smaller the blocks, fewer collisions happen.

• False. The smaller the blocks, the larger the surface area.

• False. The smaller the block, it is impossible for reaction to happen.

The graph of a chemical reaction is steeper (higher slope) when it is very fast. If a solid reactant is cut into smaller pieces, what would you expect of its graph?

• horizontal then curve slowly upwards

• vertical then suddenly horizontal

• flat in the beginning and suddenly vertical

• very steep in the beginning and then slowly curves horizontal

Which of the following statements is TRUE?

• The larger the surface area, the fewer collisions exist.

• The smaller the surface area, there would more frequent collisions.

• The larger the surface area, the fewer the number of collisions.

• The larger the surface area, the higher the number of frequent collisions.

Based on the video "Collision Theory", what affects the speed of the particles during collisions?

• The average size of the particles

• The average pressure of the particles

• The average concentration of the particles

• The average kinetic energy of the particles

Based on your reading, which type of carbonate is used in the experiment in Activity 8.3B?

• sodium carbonate

• potassium carbonate

• magnesium carbonate

• calcium carbonate