Which of the following is a form of stored energy? A) heat energy
B) kinetic energy
C) sound energy
D) chemical potential energy

Part of molten rock at mid-ocean ridges

Consider these four line graphs representing speed in meters/second, where each x-axis is labelled in seconds and each y-axis is labelled in meters. which line graph indicates the greatest speed at 5 seconds?

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.