Answer:
Two
Step-by-step explanation:
There are two ways to determine the number sets of equivalent protons in a compound.
(a) By substitution
Replace each H with a different group and see if you get a different compound
For example, the six CH₃ H atoms are an equivalent set, because, if I replace any one of them, I will always get the same compound: 1-chloromethyl-4-methylbenzene (Fig. 1).
Similarly, the four aromatic H atoms are an equivalent set. If I replace any one of them, I will always get the same compound: 2-chloro-1,4-dimethylbenzene (Fig. 2).
Thus, there are two sets of equivalent protons in p-xylene.
(b) By symmetry
Two atoms are equivalent if one can be converted into the other by a symmetry operation on the molecule.
The methyl hydrogens can be interconverted by a combination of reflections about the AB and CD mirror planes and byrotations about the C-C bonds to the ring (Fig. 3).
Similarly, the four aromatic H atoms can be interconverted by a combination of reflections about the AB and CD mirror planes.
Again, we find two sets of equivalent protons.
Answer:In a physical change, atoms are not rearranged and the matter's physical and chemical properties are unchanged. Chemical changes, on the other hand, rearrange the atoms of matter in new combinations, resulting in matter with new physical and chemical properties.
Explanation:
easy
Answer:
The actual answer is compounds from the science notebook
Explanation:
The two compounds present in unpolluted air are carbon dioxide and water. You may think that carbn dioxide is a greenhouse gas, yes it is and at the same time not. There animals in the earth that produces carbon dioxide into the atmosphere, the carbon dioxide too, is also need for plan respiration.
Unpolluted air contains small amounts of various compounds. Examples include Carbon Dioxide (CO2) which is used in the process of photosynthesis and Argon (Ar) which remains chemically inactive.
Unpolluted air primarily consists of nitrogen and oxygen, but it also contains small amounts of other gaseous compounds. Two of these compounds found in unpolluted air are carbon dioxide (CO2) and argon (Ar). Carbon dioxide (CO2), which is produced by animals during respiration and used by plants during photosynthesis, and argon (Ar), a noble gas, which is chemically inert and does not directly affect the climate or living organisms.
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The two gases that cannot be broken down by chemical means are He (helium) and Xe (xenon).
According to the question, we are looking for two gases that cannot be broken down by chemical means. Chemical means refer to chemical reactions that break down compounds into their constituent elements. The options given are (1) CO and He, (2) CO and NH3, (3) Xe and He, and (4) Xe and NH3.
CO and NH3 are both compounds that can be decomposed by chemical means. However, both He (helium) and Xe (xenon) are noble gases that cannot be broken down by chemical means. This is because noble gases have stable electron configurations, making them unreactive and resistant to chemical reactions. Therefore, the correct answer is (3) Xe and He.
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