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Sindrei [870]
3 years ago
8

Il give brainliest question in the picture

Chemistry
2 answers:
Licemer1 [7]3 years ago
5 0

Answer:

Nitrogen and Argon

Explanation:

These gases are part of a class of "noble" gases because they don't react with anything.

Alina [70]3 years ago
3 0
CO2 and n2 because they are in the air most the time so nothing bothers them other than oxygen
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How many molecules of H20 are in 2.0 moles
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Hi There! :)

<span>How many molecules of H20 are in 2.0 moles
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12.044*10^23 or 6.022⋅1023 <span>atoms</span>
4 0
4 years ago
How many neutrons are in the radioactive isotope 40/19? A. 40 B. 19 C. 21 D. 20
Olin [163]
The answer is B. 19 <span>✔

Its 19 because h</span><span> (atomic mass is4.02643(11) u) contains one proton and three </span>neutrons<span> in its nucleus. It is a highly unstable </span>isotope<span> of hydrogen. It has been synthesised in the laboratory by bombarding tritium with fast-moving deuterium nuclei.</span>
5 0
3 years ago
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When was the periodic table of elements first published?
Travka [436]
I think this answer is D or C
4 0
3 years ago
The formulas for ethane, ethene, and ethyne are C 2 H 6 C2H6 , C 2 H 4 C2H4 , and C 2 H 2 C2H2 , respectively. Rank these compou
Anuta_ua [19.1K]

Answer:

Ethane (1.09 A) > Ethene(1.076 A) > Ethyne(1.06 A)

Explanation:

The types of bonds present are:

a) Ethane : single bond

b) Ethene : double bond (one sigma one pi)

c) Ethyne: triple bond (one sigma and two pi bonds)

More the number of bonds lesser the bond length.

Thus the order of bond length of carbon-carbon bond will be:

Ethane (1.09 A) > Ethene(1.076 A) > Ethyne(1.06 A)

6 0
4 years ago
A correct name for the following compound is:_________.a) 4-bromo-3,8-dimethylbicyclo[5.2.2]nonane b) 3,8-dimethyl-4-bromo-bicyc
mixer [17]

Answer:

e) 4-bromo-3,8-dimethylbicyclo[5.2.0]nonane

Explanation:

The missing image of the the  compound we are to name is attached below.

Before we can name an organic compound; It is crucial we know the guiding rules in naming them.

1. Select the longest continuous carbon chain as the root hydrocarbon and name according to the number of carbon atoms it contains, adding appropriate suffix to indicate the principal substituent group.

2. Number the carbon atoms in the root hydrocarbon from the end which gives the lowest number to the substituents.

3. If the same substituent is present two  or more times  in a molecule; the number of this substituent is indicated by the prefix di -(2), tri - (3) , tetra - (4) etc attached to the substituent name.

4. If there is more than one type of substituent in the molecule ; the substituents are named according to the alphabetical order but where  there are mixed substituents ; the inorganic are named first.

5. In selecting and numbering the longest continuous chain, the functional groups are given preference over substituents., i.e the functional group is given the smallest possible number.

In the light of the above guiding rules; we were able to name the given compound because the compound contains nine carbons in the ring form which result to root name nonane. The two methyl are on the third and eight carbon; bromine is on the fourth carbon ; there are two cyclic ring present in the compound where we have 5 carbons in one structure, another 2 carbons in the second structure and zero carbon in the bridge structure which eventually result to the correct  name:

4-bromo-3,8-dimethylbicyclo[5.2.0]nonane

5 0
3 years ago
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