Why is an element considered a pure substance? im i right

An element is considered a pure substance because it is made up of only one type of atom and cannot be broken down into a simpler form.

1-10. need . physics. circular motion. 35 points

If steel is more dense that lake water, why can a boat float

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final