Is o2 an element or not?

Is a pencil falling to the floor anon contact force, a force, or a contact force

Astudent uses universal ph paper to find the ph of three solutions . solution a has a ph of 5 solution b has a ph of 11 and solution c has a ph of 7 identify which solution is acidic which solution is neutral and which solution is basic

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