Rates of Reactions - Part 1

The video explains the concept of reaction rate, which measures how quickly reactants turn into products. It describes two methods to measure reaction rate: by observing the decrease in reactants or the increase in products. Examples include a reaction between calcium carbonate and hydrochloric acid, where the decrease in mass of reactants or the increase in volume of carbon dioxide is measured. Graphs are used to analyze the rate of reaction, showing that it typically decreases over time. The video concludes with a recap of these concepts.

What is the reaction rate a measure of?

• The speed at which reactants turn into products

• The speed at which products are consumed

• The temperature change during a reaction

• The time it takes for a reaction to start

Which method involves measuring the decrease in reactants?

• Counting the number of bubbles formed

• Calculating the energy released

• Measuring the mass loss of reactants

• Observing the color change

In the reaction between calcium carbonate and hydrochloric acid, what is given off as the reactants lose mass?

• Oxygen gas

• Hydrogen gas

• Carbon dioxide gas

• Nitrogen gas

How can the rate of reaction be determined from a graph of mass of reactants against time?

• By counting the number of peaks

• By measuring the area under the curve

• By finding the gradient of the curve

• By observing the color of the graph

What is an alternative method to measure reaction rates besides observing the decrease in reactants?

• Measuring the decrease in light intensity

• Measuring the increase in temperature

• Counting the number of reactant molecules

• Observing the increase in product volume