During a certain chemical reaction, energy is transferred from the reaction system to its surroundings. Which statement is true in this situation?
O A. The kinetic energy of the particles in the system and its
surroundings are the same.
O B. The particles in the reaction system have more kinetic energy.
O C. The particles differ in potential energy instead of kinetic energy.
O D. The particles in the surroundings have more kinetic energy.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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