The diagram shows a roller-coaster track. Assume that the system is closed. At point E, the roller-coaster has just exited the vertical loop.
B
D
с
E
A
Which chart best shows the relative amounts of potential and kinetic energy
of a roller-coaster car at point E?

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.

The fact that the total amount of energy in a system remains constant is a(n)