Answer:
The structure for the compound elucidated (4-Ethylbenzoic acid) is attached below.
Explanation:
Degree of Unsaturation = 
(where n = no of moles)
= 
= 9 - 6+1 = 4
⇒ 2 ring. 3 double bonds.
From the 1H NMR data given (peaks labeled A-E)
A. 1.2 (3H, t) ⇒ -CH3
B. 2.6 (2H, q) ⇒ -C=C-H or Aromatic-CH3
C. 7.3 (2H, d) ⇒ Aro.-H
D. 8.0 (2H, d) ⇒ Aro.-H
E. 11.0 (1H, s) ⇒ -COOH
Answer: Carbon-12 and Carbon-14 both have the atomic number of 6.
Explanation: They are both isotopes of one another. This means they have different amount of neutrons, resulting in different atomic masses.
Answer:
The atmosphere protects living things on earth from the sun's harmful ultraviolet radiation.
Explanation:
keeping the earth warm, the atmosphere contains gases that enable the "Greenhouse effect", (it means that they are able to trap the heat that is reflected from the surface of the earth.)
The idea that atoms are unstable would have been strengthened because the orbiting electron would lose energy and fall into the nucleus.
Water is made of 2 hydrogen and 1 oxygen atoms. The molecular weight for water should be 1+ 1+ 16= 18. Then the amount of water molecule in 11.4 gram of water should be: 11.4g/18= 0.63 moles.
Since 1 water means 2 hydrogen atoms, then the amount of hydrogen atom should be: 2/1 * 0.63= 1.26 moles of hydrogen
