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katrin [286]
3 years ago
15

The discoveries of Niels Bohr were: A. orbits of electrons. B. charge on the electron. C. quantum energy emissions. D. static el

ectricity
Chemistry
2 answers:
Mumz [18]3 years ago
8 0
I think its A.. Hope it helps you
Delicious77 [7]3 years ago
4 0

The correct answer are A. orbits of electrons and C. quantum energy emissions.

Neil Bohr was the first who explained that electrons moves around the nucleus in the separate orbits or shells in an atom. He also discovered that electrons can only be in a particular orbits of fixed energy and when electrons allowed to jump from one orbit to another, they absorbed or emitted electromagnetic radiation.

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Two compounds are standing at the same temperature. Compound "A" is evaporating more slowly than compound "B." According to the
frosja888 [35]

Answer:

Option D) Compound B may have a lower molecular weight.

Explanation:

Compound A and B are standing at the same temperature yet compound A is evaporating more slowly than compound B.

This simply indicates that compound B have a lower molecular weight than compound A.

This can further be seen when gasoline and kerosene are placed under same temperature. The gasoline will evaporate faster than kerosene because the molecular weight of the gasoline is low when compared to that of the kerosene.

4 0
3 years ago
For molecules with more than one ionizable groups, such as glycine, which of the following statements is true? For molecules wit
tester [92]

Answer: Option (a) is the correct answer.

Explanation:

The isoelectric point (pI) is actually the pH where a particular amino acid exists as a neutral molecule. This means that if pH equals pI then there will be no electric charge on the molecule.

Therefore, the statement at pH near the pI, nearly all the molecules carry no net charge, is true.

A buffer is composed of a solution of weak acid or base and salt of weak acid/base.So, when pH equals pI then there occurs no net charge. Hence, there will be no existence of conjugate acid-base pair.

Therefore, the statement when the pH is near the pI, the solution is near its maximum buffering ability, is false.

It is known that when pH is less than pI then there will be a net positive charge on the amino acid.

Hence, the statement at a pH near the pI, nearly all the molecules carry a net positive charge, is false.

When pH is greater than pI then amino acid will have a net negative charge. Hence, the statement at a pH near the pI, nearly all the molecules carry a net negative charge, is false.

Thus, we can conclude that out of the given options the statement at pH near the pI, nearly all the molecules carry no net charge, is true.

5 0
3 years ago
Which of these elements is a noble gas? hydrogen (H) barium (Ba) nitrogen (N) krypton (Kr) bromine (Br)
ruslelena [56]
Krypton...it is based off of its location on the periodic table
8 0
3 years ago
Read 2 more answers
Electron Lender or borrower?
rjkz [21]

all metal borrows......................
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3 years ago
Can someone please help ?????
Digiron [165]
1 valence electron, are called alkali metals, are metals, react with water
8 0
3 years ago
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