Approximately how much brighter than the star aldebaran is the star betel-
geuse?
(1) betelgeuse is approximately twice as bright as aldebaran.
(2) betelgeuse is approximately 10 times as bright as aldebaran.
(3) betelgeuse is approximately 100 times as bright as aldebaran.
(4) betelgeuse is approximately 10,000 times as bright as aldebaran.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.