GCSE Chemistry - Rates of Reaction #46

The video tutorial explains the concept of reaction rates, which indicate how quickly reactants turn into products. It covers the variability of reaction rates, from slow processes like rusting to fast ones like explosions. The tutorial details how to measure reaction rates by tracking the consumption of reactants or the formation of products, using equations and units such as grams, centimeters cubed, and moles. It also demonstrates calculating average reaction rates and visualizing them through graphs. Finally, it discusses using alternative units for expressing reaction rates.

Which of the following is an example of a slow chemical reaction?

• Fireworks explosion

• Combustion of gasoline

• The reaction between magnesium and acid

• The rusting of iron

How can the rate of a chemical reaction be expressed mathematically?

• As the quantity of reactants used over time

• As the color change of the reactants

• As the time taken for the reaction to start

• As the temperature change during the reaction

If 180 cm³ of hydrogen is produced in 2 minutes, what is the rate of reaction in cm³ per second?

• 3 cm³/s

• 1.5 cm³/s

• 2 cm³/s

• 0.5 cm³/s

What happens to the rate of reaction as the reactants are used up?

• It decreases

• It increases

• It remains constant

• It becomes zero

Which unit can be used to express the rate of reaction besides grams or centimeters cubed per second?

• Moles per minute

• Kilograms per day

• Liters per hour

• Meters per second