Number 9 adding oil lubricates the chain making it easier to pedal. Also the oil prevents rusting
Examination by a test; experiment, as in chemistry, metallurgy, etc.
Answer:
Mitosis
Explanation:
you scrape your knee and the skin repairs itself
Answer:
Option B. 10
Explanation:
If 1 mol of butanol contains 6×10²⁴ atoms of H, let's calculate the amount of H.
(number of atoms / NA)
6.02 x 10²³ atoms ___ 1 mol
6×10²⁴ atoms will occupy (6×10²⁴ / NA) = 9.96 moles
H, has 10 moles in the butano formula.
