HE im bout to fail 8th grade and i-d-k what to do, everyone is saying it like it's that easy i just want to go into highschool

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules

Why is it that 85.48 rounded to two significant figures is 85 and not 86?