The orbits of the planets are coplanar because during the Solar System's formation, the planets formed out of a disk of dust which surrounded the Sun. Because that disk of dust was a disk, all in a plane, all of the planets formed in a plane as well.
http://curious.astro.cornell.edu/about-us/57-our-solar-system/planets-and-dwarf-planets/orbits/242-why-do-all-the-planets-orbit-in-the-same-plane-intermediate
Answer:
Option D
Explanation:
Rutherford deduced that the atomic nucleus was positively charged because the alpha particles that he fired at the metal foils were positively charged, and like charges repel. Alpha particles consist of two protons and two neutrons, so they are positively charged. In Rutherford's experiments most of the alpha particles passed straight through the foil without being deflected. However, occasionally the alpha particles were deflected in their paths, and rarely the alpha particles were deflected backward at a 180 degree angle.
Since like charges repel, Rutherford concluded that the cause of the deflections of the positively charged alpha particles had to be something within the atom that was also positively charged. Rutherford concluded from his metal foil experiments that most of an atom is empty space with a tiny, dense, positively charged nucleus at the center that contains most of the mass of the atom.
Answer: A) ionic salt
Explanation: Chlorine has a high electronegativity of 3.0. Copper like most metals has a low electronegativity, So the bonding is ionic making the compound an ionic salt.
1: B
2: B/C
3: D
4: A, if the answer to question two is that they exist because predators prefer dully colored guppies.
5: D
Answer:
14 % (to the nearest percentage)
Explanation:
We must first obtain the molar mass of diethyl ether rom its molecular formula, C4H10O.
relative atomic mass of carbon =12, hydrogen =1 oxygen -16
Hence we have;
(4*12) + (10*1) +16 = 48 + 10 + 16 = 74g/mol
mass percent = total mass of hydrogen/ molar mass of compound * 100
% by mass of hydrogen = 10/74 * 100 = 14 % (to the nearest percentage)