1.3 Factors Affecting The Reaction Rate

Which of the following are the factors that affecting the rate of reactions?

• Size of reactants

• Concentration of reactants

• Temperature

• Presence of catalyst

• All of above

Which factor can only affects the rate of reaction when involved gases as the reactant?

• Concentration of reactants

• Pressure

• Temperature

• Size of reactants

Which of the following statement is correct?

• Smaller size of reactants, smaller total surface area, higher reaction rate

• Larger size of reactants, smaller total surface area, higher reaction rate

• Smaller size of reactants, larger total surface area, higher reaction rate

• Larger size of reactants, larger total surface area, higher reaction rate

Does the presence of catalyst will change the amount of product?

• Yes

• No

Grains of sugar have a greater _______ than a solid cube of

sugar of the same mass, and therefore will dissolve quicker in water.

• Surface Area

• Catalyst

• Temperature

• Concentratrion

A catalyst works by

• changing the order of the reaction
• increasing the temperature
• lowering the activation energy
• making the activated complex

Which of the following will lower the rate

of reaction?

• adding an enzyme to the reaction

• decreasing the temperature from 40°C to

  10°C

• breaking a chunk of calcium up into

  smaller pieces

• increasing the amount of solute

  dissolved in a solution

Tags

NGSS.HS-PS1-5

How does temperature increase the rate of a chemical reaction?

• Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

• Increased number of collisions increases the chance of a 'successful collision'

• Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.

• Greater number of 'active sites' available for a reaction to take place (referring to solids)

Tags

NGSS.HS-PS1-5

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy 

What is the activation energy?

• The energy of the products

• The energy of the reactants

• The minimum energy needed by the reactants to initiate the reaction in order to form the products.

• The energy lost in the reaction