Rate Of Reaction

What are the three main methods to collect data on reaction rates?

1. Collecting gas and measuring its volume using a gas syringe. 2. Measuring change of mass during a reaction. 3. Measuring precipitation.

How is gas volume measured in reaction rate experiments?

Using a gas syringe, which provides accurate measurements due to its resolution.

What is a disadvantage of using a stopwatch to measure reaction time?

Human reaction time can reduce accuracy.

What is the most accurate method for measuring the rate of reaction involving gas release?

Measuring change of mass during a reaction on a mass balance.

What is a limitation of measuring mass change in gas reactions?

Gas is released straight into the room, and this method only works for heavy gases like CO2.

How is precipitation measured in reaction rate experiments?

By observing the cloudiness in a solution and timing how long it takes for a mark to disappear.

What is a key drawback of using the precipitation method for measuring reaction rates?

It is subjective and can lead to inaccuracies due to differing opinions on when the mark disappears.

What is a catalyst?

A substance that speeds up a reaction without being used up.

How does a catalyst affect activation energy?

It lowers the activation energy required for a reaction.

What is the collision theory in relation to reaction rates?

For a reaction to occur, reacting particles must successfully collide.

What is activation energy?

The minimum amount of energy that particles must have when they collide in order to react.

How does concentration affect the rate of reaction?

Higher concentration increases the number of reacting particles in a given space, leading to a higher chance of successful collisions.

How does temperature influence reaction rates?

Higher temperatures give particles more energy, causing them to move faster and increasing the chance of successful collisions.

What effect does surface area have on reaction rates?

A larger surface area provides more space for reacting particles to collide, increasing the chance of successful collisions.

What is the relationship between the rate of reaction and the change in mass?

The rate of reaction can be measured by recording the loss of mass over time as gas is formed.

How can the volume of gas produced be measured during a reaction?

By using a gas syringe to record the volume of gas produced over time.

What happens to the solution when a precipitate forms?

The solution becomes milky or cloudy as the insoluble solid is formed.

What is the significance of rate graphs in reaction studies?

Rate graphs are used to follow the course of a reaction and compare the differences in reaction rates.

How can tangents be used in rate graphs?

Tangents can be used to determine the rate of reaction at specific points on the graph.

What is the effect of increased temperature on the number of particles above activation energy?

Increased temperature results in more particles having energy above the activation energy, leading to a faster rate of reaction.

What is the role of light sensors in measuring precipitation?

Light sensors can detect changes in light intensity as the precipitate forms, indicating the rate of reaction.

What is the impact of pressure on reaction rates?

At higher pressure, particles are closer together, increasing the chance of successful collisions and thus the rate of reaction.

working out tangents

1. work out bottom / base of triangle (e.g B = 30-5)

2. work out the length / height (e.g height = 58-20)

3. Ans = H / B (38 / 25)