Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor.
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Calcium belongs to the alkaline earth metal group. Within a group, the melting point decreases from top to bottom. This is because the as the atomic radii increases the outer valence electrons are shielded by the inner electrons and experience a lower nuclear attraction. As a result the bonds can be broken easily which lowers their melting point.
The three elements below Calcium ib Group II A which have a lower melting point are: Strontium (Sr), Barium (Ba) and Radium (Ra)
The process scientists use is simple: dig, brush, repeat. Fossils can be found in areas that once had living organisms, like lakesides and lake bottoms. To protect them they use a chemical coating.
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Answer:
c. they carry energy is the answer
Answer:
The answer is attached
Explanation:
ach of the following reactions has been reported in the chemical literature and gives a single organic product in high yield. Identify the product in each case.
a. 3-Benzyl-2,6-dimethylphenol treated with bromine in chloroform.
b. 4-Bromo-2-methylphenol treated with 2-methylpropene and sulfuric acid.
c. 2-1sopropyl-5-methylphenol (thymol) treated with sodium nitrite and dilute hydrochloric acid.
d. p-Cresol treated with propanoyl chloride and aluminum chloride.
The answer is attached
