B. Resuelve los ejercicios (60%) 1. ¿Cuántos electrones se necesitan para

formar una carga de –38 µC, sabiendo que la

carga de un solo electrón es −1.6 X10−19 C?

2. ¿Cuál es la magnitud de la fuerza que ejerce

una carga de 12 µC sobre otra carga de 25

mC si están separadas 28 cm?

3. ¿Cuál es la fuerza eléctrica de repulsión entre

dos protones separados 4.5 X10−15 m uno de

otro en el núcleo atómico? Recuerda que la

carga del protón es la misma que la del

electrón solo que de signo positivo.​

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.