Given the law of conservation of energy, what best explains why heat may be absorbed during a chemical reaction?

a. the energy of the reactants is less than the energy of the products.

b. chemical reactions absorb as much energy from the surroundings as they release.

c. the products of a chemical reaction have a higher temperature than the reactants.

d. chemical reactions require kinetic energy because the reactants contain potential energy.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The answer is d.potassium