GCSE Chemistry - How to Calculate the Rate of Reaction - Measuring Rate of Reaction #48

The video tutorial explains how to use graphs to measure both the mean and instantaneous rates of a chemical reaction. It covers calculating the mean rate by dividing the volume of hydrogen produced by time and determining the instantaneous rate by finding the gradient of a tangent to the curve on a graph. The tutorial also discusses using alternative graphs to analyze the amount of magnesium remaining over time.

What is the main limitation of calculating the average rate of a reaction over a fixed period?

• It is only applicable to reactions at room temperature.

• It can only be used for reactions involving gases.

• It requires complex mathematical calculations.

• It assumes the reaction rate is constant throughout.

What does a steep curve on a reaction rate graph indicate?

• A completed reaction

• A constant rate of reaction

• A high rate of reaction

• A low rate of reaction

How do you find the mean rate of reaction over a specific period using a graph?

• By calculating the total volume of gas produced

• By measuring the steepness of the curve

• By finding the intersection of the curve with the X-axis

• By dividing the total volume of gas by the time period

What is the first step in determining the rate of reaction at a specific time?

• Measuring the steepness of the curve

• Drawing a tangent to the curve

• Finding the point on the X-axis

• Calculating the total volume of gas

What is a tangent in the context of reaction rate graphs?

• A line that is parallel to the X-axis

• A line that is perpendicular to the Y-axis

• A line that intersects the curve at multiple points

• A straight line that touches the curve at one point

How is the gradient of a tangent related to the rate of reaction?

• It is always greater than the rate

• It is inversely proportional to the rate

• It is equal to the rate of reaction

• It has no relation to the rate

What should you do if your tangent is slightly off when calculating the rate?

• Recalculate using a different method

• Adjust the tangent to be steeper

• Use the tangent as is, as small errors are acceptable

• Ignore the tangent and use the average rate