Rate of reaction is the speed with which a chemical reaction takes place, measured by the amount of a reactant used or amount of product formed in a given time.

Volume is how much 3D space matter occupies. It is usually measured in cm³.

Accurate measurements are those that are close to the true value.

Precise measurements have very little spread from the mean value. They are values that lie close to each other.

Appropriate equipment for measuring the rate of a reaction

Combined science

In the Industrial Chemistry unit, pupils will build on their knowledge of reaction rates to learn about the industrial processes involving chemical reactions and the factors that affect them.

In the Energy Changes in Reactions unit, pupils learned about bond breaking, bond making, and reaction profiles.

Rate of reaction

Which equipment is suitable for measuring the percentage of light transmitted through a reaction producing a precipitate?

when the reaction produces small volumes of gas rapidly

when the reaction produces large volumes of gas at a slow rate

when the gas needs to be collected over water

When is an upturned measuring cylinder suitable for measuring gas volumes in a reaction?

it should be smaller than expected to save space

it should be larger than expected to avoid overflow

it should be close to the expected volume of gas produced

it should be adjustable to accommodate different reactions

What should be considered when selecting the size of measuring equipment for gas volumes?

 they are less expensive than other equipment

they have small graduations and are designed to prevent gas escaping

they can measure gases at high temperature

Why are gas syringes considered ideal for measuring small volumes of gas with high precision?

the temperature change of the reaction mixture

the decrease in mass of the reaction mixture over time

the increase in volume of the reaction mixture

If a reaction in an open system produces a gas, what can be measured to determine the rate of reaction?

In a reaction that produces a gas, what happens to the volume of gas produced per second as the reaction progresses?

If a reaction effervescences, what does this tell us about the state of one of the products made?

If a product in a chemical reaction is a gas, how can we measure the volume of gas produced in a given time?

When a chemical reaction takes place in a closed system, which of the following may be observed?

divide the change in temperature by the change in time

multiply the initial concentration of reactants

divide the change in volume of reactants by the change in time

subtract the final concentration of reactants

How can we calculate the rate of reaction?

using the same method to obtain the same/similar results again

another person uses the same method to obtain the same/similar results

Match the key terms to the correct definition.

A reaction produces 5 cm³ of gas in 10 seconds. What is the rate of reaction?

Starter Quiz