Oquizy

What does this bar graph of volume of gas produced against concentration demonstrate?

Higher concentration increases rate of reaction Lower concentration gives more gas Rate increases with decreasing concentration Reaction yield increases with concentration

Which conclusion is correct?

MnO₂ decomposes H₂O₂ to a new product MnO₂ increases oxygen yield MnO₂ increases reaction rate MnO₂ raises activation energy

What does this show?

Activation energy is lower at higher temperature Fewer particles have energy to react at higher temperature Higher temperature increases activation energy More particles have enough energy to react at higher temperature

In the iodine clock experiment, a fixed amount of sodium thiosulfate and starch is added to acidified hydrogen peroxide and potassium iodide. The time taken for the solution to turn blue is recorded.
How is the rate of reaction determined in this experiment?

Measuring how much iodine is produced Measuring the final temperature Measuring the pH change of the solution Measuring the time taken for blue-black colour to appear

What is the correct interpretation?

At higher temperature, less gas is produced At higher temperature, rate of reaction is slower Gas solubility increases at higher temperature Higher temperature increases reaction rate

From the graph, which is true if volume is the same?

X used more concentrated acid X was done at a lower temperature Y is more reactive Y used a catalyst

Quiz: Chemistry - Rate Of Reactions