Chemical Reaction Rates and Factors

The video tutorial explains the factors affecting the rate of chemical reactions, including the nature of reactants, concentration, temperature, and catalysts. It discusses how ionic reactions are faster due to fewer bonds breaking, and how increased concentration leads to more collisions, thus increasing reaction rates. Temperature generally increases reaction rates for both exothermic and endothermic reactions. Catalysts can either speed up or slow down reactions. The rate equation is introduced to show the mathematical relationship between reaction rate and reactant concentration.

Which type of reaction involves the exchange of ions and occurs quickly?

• Covalent reaction

• Ionic reaction

• Endothermic reaction

• Exothermic reaction

Why is the reaction between nitrogen gas and oxygen gas faster than the reaction involving methane and oxygen?

• It is an exothermic reaction

• It involves fewer bond breakages

• It involves more bond breakages

• It is an endothermic reaction

According to the law of mass action, the rate of a reaction is directly proportional to what?

• Temperature of the reactants

• Pressure of the system

• Product of molar concentrations of reactants

• Volume of the container

What happens to the reaction rate when the concentration of reactants is increased?

• It becomes zero

• It increases

• It remains the same

• It decreases

How does temperature generally affect the rate of a reaction?

• Decreases the rate

• Increases the rate

• Stops the reaction

• Has no effect

What is the effect of a positive catalyst on the rate of a reaction?

• Increases the rate

• Decreases the rate

• Has no effect

• Stops the reaction

What is the role of a negative catalyst in a chemical reaction?

• Has no effect

• Stops the reaction

• Decreases the rate

• Increases the rate

In the rate equation, what does the constant 'K' represent?

• Temperature of the system

• Order of reaction

• Rate constant

• Concentration of reactants

What does the order of reaction indicate in a rate equation?

• The power to which the concentration of a reactant is raised

• The speed of the reaction

• The temperature dependence

• The type of catalyst used

Which of the following is an example of a general reaction used to explain the rate equation?

• A + B → C + D

• 2H2 + O2 → 2H2O

• CH4 + 2O2 → CO2 + 2H2O

• N2 + 3H2 → 2NH3