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olya-2409 [2.1K]
3 years ago
14

The nitrogenous bases cytosine and thymine are

Chemistry
1 answer:
mr_godi [17]3 years ago
7 0
Purines are adenine and guanine. So the answer should be D (Pyrimidines). besides, phosphate group and pentose sugar are a part of a nucleotide.
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Convert 6.93 x 1024 atoms of carbon to moles of carbon.
Aleksandr [31]

Answer: 11.5 moles of carbon

Explanation:

Based on Avogadro's law:

1 mole of any substance has 6.02 x 10^23 atoms

So, 1 mole of carbon = 6.02 x 10^23 atoms

Z moles = 6.93 x 10^24 atoms

To get the value of Z, cross multiply:

(6.93 x 10^24 atoms x 1mole) = (6.02 x 10^23 atoms x Z moles)

6.93 x 10^24 = (6.02 x 10^23 x Z)

Z = (6.93 x 10^24) ➗ (6.02 x 10^23)

Z = 1.15 x 10

Z = 11.5 moles

Thus, there are 11.5 moles of carbon.

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3 years ago
Which observation indicates that the kinetic-molecular theory has limited use for describing a certain gas? Gas particles are ac
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My answer to the question is "Gas particles are acting like tiny,solid spheres".

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The animal kingdom is large and diverse. Scientists discover new species all the time, and they need a way to classify them. The
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The answer is D, because "Animals without a backbone are invertebrates."

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3 years ago
Why are valence electrons important
koban [17]

Explanation:

The electrons in the outermost shell of an atom are the valence electrons. These electrons are the most loosely held in an atom.

The energy required to remove these electrons are not as great as those of the inner shell electrons.

  • Atoms of some elements show no tendency to combine with other  atoms because they have completely filled outer energy levels.
  • Their outermost shell, valence shell and the electron numbers are complete for them. These are the noble gases.
  • other atoms share or exchange their valence electrons in order to have a stable configuration.
  • The valence electrons are involve in inter-atomic bond formation and interactions
  • Also the distribution of these electrons determines inter-molecular interactions between molecules.

Learn more:

valence electrons in metalloids brainly.com/question/3023499

#learnwithBrainly

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Calculate the number of atoms
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D.....................
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