Why does every chemical reaction require a certain amount of activation energy?
a.
energy is released when the reactants begin to react.
ob. energy lost to the environment during the reaction must be replaced.
c.
d.
e.
forming the activated complex requires energy.
the products have more potential energy than the activated complex.
the reactants have less potential energy than the products.

possibly, yes.

explanation:

the amount of sugar you take in is dangerously high, risk of heart disease, high risk of diabetes, and etc.

it takes on an electronical energy

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

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.