What is it called when there is a difference between what one expects to happen and what actually happens?

Do amazon give you real apple products

Your state government is planning to stop the payment of registration fee for senior school certificate.write a letter to the governor giving at least three reasons why the state should continue with the gesture of goodwill

Write short answers to a series of questions about elie wiesel's "the perils of indifference." you'll reference the speech directly to describe how its language and structure contribute to its tone, purpose. and overall meaning.