The minimum amount of energy required to overcome the energy barrier in a chemical reaction is the
a. heat of reaction.
b. activation energy.
c. kinetic energy of the reactants.
d. enthalpy of the products.

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.