Explanation:
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single.
The best and most correct answer among the choices provided by the question is the second choice "<span>the moon’s orbital period and distance from Earth"
</span> <span>The Earth's mass is </span>5.9736<span> x 10</span>24<span> kg. That's a big number, so let's write it out in full: 5,973,600,000,000,000,000,000,000 kg. You could also say the Earth's mass is </span>5.9<span>sextillion tonnes. Phew, that's a lot of mass.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
Here are some rules:
1. The oxidation state of a free element (uncombined element) is zero.2. For a simple (monatomic) ion, the oxidation state is equal to the net charge on the ion.3. Hydrogen has an oxidation state of +1 and oxygen has an oxidation state of −2 when they are present in most compounds.
The oxidation number of Fe in Fe(NO3)2 is +3.
Fireworks
An exothermic reaction is one where the products have lower energy than the reactants, so the reaction yields energy. The chemical compounds present in firework fuel release a lot of energy upon oxidation. Photosynthesis is endothermic, settling of silt is not a chemical reaction, it is a physical change. Finally, the bubble formation in soda is not exothermic; otherwise, the sodas would become very hot very fast.