Oquizy

This is the energy graph for Haber Process. Iron catalyst is used. Which statement is true?

Catalyst affects equilibrium position Catalyst reduces activation energy Catalyst speeds up both forward and backward reactions Iron catalyst lowers yield in Haber process

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

Xinyi is testing rate of reaction for an unknow solid. She uses sample A (powdered solid) and sample B (same mass, large lumps) and obtains this graph.
What does the disappearing cross indicate?

Sulfur is forming and blocking the view The pH is increasing The rate of gas production The reaction has ended completely

Quiz: Chemistry - Rate Of Reactions