Edexcel CC14: Rates of reaction

Rate of chemical reaction means

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

7.4: Which factors increase the rate of a reaction.

• increasing temperature

• increasing concentration

• increasing surface area

• all of these

7.3: Increase in temperature of the reactants can do one of the following

• Slow collision frequency

• Allow less effective collision between the particles

• Neutralise the reaction

• increase collision between the particles thus increasing the rate.

7.4: Why does a catalyst increase the rate of reaction?

• it produces extra energy for the reactants

• it increases the speed of the reactant particles

• it increases the frequency of particle collisions

• it reduces the activation energy of the reaction

7.4: Which of the following increase the reaction rate?

• less surface area

• lower temperature

• an inhibitor

• increased concentration

7.3: Why don't all collisions between particles cause a reaction?

• the particles also need to collide with a catalyst

• not all the particles collide with enough energy

• not all the particles collide at a high enough temperature

• the particles need to collide with each other twice

7.4: Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions

• it only increases the frequency of particle collisions

• it only increases the energy of particle collisions

• it reduces the activation energy of the reaction

7.7: B represents

• energy absorbed

• energy released

• activation energy

7.7: C represents

• energy absorbed

• energy released

• activation energy

7.4: To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water

• Place the products in ice bath

• Place the reactants in a ice bath

• Keep stirring the reactants with a stirring rod