Electrons are shared between two ions in covalent bonds. Hydrogen bonding isn't a 'true' bond, as electrons aren't shared or exchanged. Instead, the hydrogen on one atom is strongly attracted to a highly electronegative atom (like F, O, N) on an adjacent molecule. The result is a strong attractive force between the adjacent atoms.
FYI - this explains why a low molecular weight polar substance like water (H2O) has a significantly higher boiling point than other nonpolar molecules of similar molecular weight. More energy has to be added to the system to overcome the attractive forces between the molecules of water.
Answer:
A
Explanation:
Energy is absorbed because the product has more energy than the reactants have.
Answer:
B
Explanation:
I think that the anserw is B.
Answer:
1.94 L
Explanation:
21°C = 21 +273 = 294 K
27°C = 27 + 273 = 300 K
T1/V1 = T2/V2
294 K/1.9 L = 300 K/x L
x = (1.9*300)/294 ≈ 1.94 L
Answer:
Josue
Explanation:
J.J Thompson proposed the plum pudding model of the atom. In his proposition, the atom is a sphere of positive charges into which negative charges were embedded. This model of the atom did not significantly contribute to our present day understanding of atomic structure.
On the other hand Ernest Rutherford laid out the foundation for a more accurate understanding of atomic structure in his nuclear model of the atom. According to Rutherford, the atom consists of a positively charged massive core called the nucleus around which electron move in orbits. His idea was akin to the solar system with the sun at it's core and planets moving around the sun in orbits.
This his idea of the nuclear theory was held as fundamentally correct by Neils Bohr's model of the atom. Hence, his nuclear theory of the atom was a significant milestone in our present day understanding of atomic structure.
