In an exothermic reaction, what happens to the surroundings? O A. The temperature decreases.
B. The activation energy is restored.
C. The temperature increases.
D. The thermal capacitance is increased.

In an endothermic change, temperature is absorbed from surrounding molecules to continue reacting. If these molecules are losing heat, that means their temperature will drop, resulting in a temperature decrease.

Each calcium ion has a charge of +2, which can also be written as ca2+. if those ions move out of the neuron and no other ions are moving, the neuron would lose the positive charge associated with those ions and become more negatively charged.