5.6.1 Rates of reaction KS4

What happens to the rate of reaction when the surface area to volume ratio of a reacting solid is increased?

• The rate of reaction decreases
• The rate of reaction cannot be determined
• The rate of reaction increases
• The rate of reaction remains the same

What does the frequency of successful collisions depend on?

• Mean energy of the particles
• Temperature of the reaction
• Pressure of the reaction
• Concentration of reactants

What is the rate of a reaction?

• The change in volume of a reactant or product during a reaction
• The measure of how quickly a reactant is used up or a product is formed
• The amount of energy needed for a collision to be successful
• The units for rate are usually g/s or g/min

What is the purpose of a catalyst in a reaction?

• Increases the rate of a reaction
• Does not affect the reaction
• Decreases the frequency of collisions
• Changes the overall chemical equation

What happens to the surface area to volume ratio when a large lump is divided into a powder?

• The surface area to volume ratio increases
• The surface area to volume ratio decreases
• The area of exposed surface decreases
• The total volume increases

What happens to the surface area to volume ratio when a large lump of a solid is ground into a powder?

• The surface area to volume ratio increases
• The surface area to volume ratio stays the same
• The surface area to volume ratio becomes zero
• The surface area to volume ratio decreases

What happens to the proportion of collisions which are successful when the temperature of the reaction mixture is increased?

• The proportion of collisions which are successful increases
• The proportion of collisions which are successful cannot be determined
• The proportion of collisions which are successful remains the same
• The proportion of collisions which are successful decreases

What is the function of a catalyst in a reaction?

• Changes the overall chemical equation
• Increases the frequency of collisions
• Does not affect the reaction
• Decreases the rate of a reaction

What is the role of a catalyst in biological reactions?

• Increases the rate of a reaction
• Does not affect the reaction
• Alters the products of the reaction
• Is chemically changed or used up at the end of the reaction

What happens to the rate of reaction when the concentration of a reacting solution is increased?

• The rate of reaction stays the same
• The rate of reaction decreases
• The rate of reaction increases
• The rate of reaction becomes zero