Physical change because it's only changing the shape of the gold.
Answer: Ammonium, when heated with aqueous base, will give off NH3 (ammonia) gas, (and depending, water vapor). This will leave the Cr2O3(s). From then on,
it is just adding or subtraction of gases or water vapor. You probably heard “Loss of electrons is Oxidation”, “Gain of Electrons is reduction”. That should help.
Explanation: This isn’t an explanation but an interesting point; Acid-Base and RedOx reactions are useful to the most complex of any Chemistry. Get this down, and Organic Chemistry will be much easier.
ΔLaw of attraction Its correct I did a Usa Test Prep :)Δ
Density is mass and volume
I think the best answer is C. Since the light energy would be the sun and chemical energy being the glucose that feeds the plant.