Oquizy

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

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

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.
Which conclusion is correct?

More powder means more product Powder reacts slower Powdered reactant increases rate Surface area has no effect on rate

What is the relationship?

Particle size has no effect Powdered CaCO₃ reacts slower Rate increases as surface area increases Surface area decreases rate

Quiz: Chemistry - Rate Of Reactions