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Nadya [2.5K]
3 years ago
6

What are the first 2 elements?

Chemistry
2 answers:
frutty [35]3 years ago
7 0
If you mean the first 2 elements in the periodic table, they are the Hydrogen H and the Helium He. The periodic table is always read horizontally.

Just for more information, Hydrogen is used in rocket fuels and hydrogen bombs, and the Helium is commonly used for filling balloons (And yes that's the element that gives you a funny voice if you inhale it :p )

Hope this Helps! :)
Zepler [3.9K]3 years ago
4 0
Hydrogen and Helium are the first 2 elements
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Two common methods to generate an aldehyde is by oxidation of an alcohol and through ozonolysis.
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<u>a</u><u>.</u><u> </u><u>True</u><u>.</u>

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Only primary and secondary alcohols can oxidise to give an aldehyde. But a weak oxidizing agent must be used to prevent formation of a carboxylic acid or ketone.

weak oxidizing agents: Chromyl chloride, silver/oxygen/500°C

take an example of <u>e</u><u>t</u><u>h</u><u>a</u><u>n</u><u>o</u><u>l</u><u>:</u>

<u>{ \bf{CH _{3} CH_{2}OH \:  \:  \frac{Ag/O_{2} }{500 \degree C}  >  \:  \:CH _{3} CHO}}</u>

<u>{ \sf{CH _{3} CHO \:  \: is \: ethanal}}</u>

<u>B</u><u>y</u><u> </u><u>o</u><u>z</u><u>o</u><u>n</u><u>o</u><u>l</u><u>y</u><u>s</u><u>i</u><u>s</u><u>:</u>

Here, reactants are Ozone gas, Carbon tetrachloride at a temperature (<20°C), ethanoic acid, zinc and water.

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if it undergoes ozonolysis, it gives ethanal and methanal.

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