Factors Affecting Reaction Rates

The video tutorial explains the analysis of reaction rate graphs using calcium carbonate and hydrochloric acid as an example. It covers how to measure and plot the rate of reaction, emphasizing the initial rate and how it changes over time. The tutorial compares different reaction conditions, such as varying concentrations and volumes, and their effects on the rate and volume of gas produced. It concludes with a detailed analysis of graphs to illustrate the impact of concentration on reaction rates.

What is plotted on the y-axis in a rates of reaction graph?

• Temperature

• Time

• Volume of CO2

• Concentration of reactants

How is the initial rate of reaction determined from a graph?

• By drawing a tangent at time equals zero

• By measuring the final volume of gas

• By calculating the area under the curve

• By measuring the steepest point of the curve

Why does the rate of reaction decrease over time?

• The concentration of reactants decreases

• The volume of gas decreases

• The temperature decreases

• The pressure increases

In the comparison of two reactions with different volumes of hydrochloric acid, why is the initial rate the same?

• The volume of gas is the same

• The temperature is the same

• The concentration of acid is the same

• The pressure is the same

What determines the total volume of gas produced in a reaction?

• The temperature of the reaction

• The initial rate of reaction

• The concentration of reactants

• The number of moles of reactants

How does the concentration of hydrochloric acid affect the initial rate of reaction?

• Lower concentration increases the initial rate

• Concentration has no effect on the initial rate

• Higher concentration increases the initial rate

• Higher concentration decreases the initial rate

In a reaction with 100 cm³ of 2 mol/dm³ hydrochloric acid, how many moles of CO2 are produced?

• 0.05 moles

• 0.15 moles

• 0.10 moles

• 0.20 moles

What is the effect of using 200 cm³ of 1 mol/dm³ hydrochloric acid compared to 100 cm³ of 2 mol/dm³?

• The initial rate is faster

• Less gas is produced

• The initial rate is slower

• The same volume of gas is produced

Why do both the blue and red curves produce the same volume of gas in the final comparison?

• They have the same volume of acid

• They have the same number of moles of CO2

• They have the same initial rate

• They have the same concentration of acid

What is the main factor affecting the initial rate of reaction in the final graph comparison?

• Volume of acid

• Concentration of acid

• Temperature

• Pressure