The reaction 2 Cu + O2 ? 2 CuO has long been called an oxidation-reaction. Copper also reacts with chlorine: Cu + Cl2 ? CuCl2. In such a reaction:. a. Copper is also oxidized even though no oxygen is present. b. Chlorine is oxidized. c. Oxidation occurs, but reduction does not. d. There is no change in oxidation numbers.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

answer seismograph;