Which statement describes the exothermic reaction represented by this graph?
Potential energy
Reaction progress
A. The amount of potential energy remains constant.
Ο Ο
B. Energy is absorbed during the reaction.
C. Energy is given off by the reaction.
O
D. Energy is first given off and then absorbed.

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

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Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?