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Luden [163]
3 years ago
12

Two identical sister chromatids are held together at what

Chemistry
1 answer:
Svet_ta [14]3 years ago
6 0
  • After DNA duplication, the chromosome becomes composed of two identical structures, called sister chromatids, which are joined at the centromere area.

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Why is rusted iron an example of an oxidation–reduction reaction? electrons are exchanged?
rodikova [14]
Electrons are exchanged, yes.
7 0
4 years ago
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A crime lab received a 235-gram sample. The sample had a molecular mass of 128.1 grams and the empirical formula is CH2O. How ma
kvv77 [185]

Explanation:

Given parameters:

Mass of sample = 235g

Molecular mass of sample = 128.1g

Empirical formula = CH₂O

Unknown:

Mass of each element in the sample = ?

Solution:

To solve this problem, we must know that the empirical formula of any compound is the simplest ratio of the atoms it contains. This is not the true formula of the compound.

      Molecular formula = (Empirical formula)ₙ

Let us find the molecular mass of the sample;

      CH₂O = 12 + 2(1) + 16 = 30g

   

      128.1  = (30)n

          n = 4

The molecular formula of the compound is;    (CH₂O)₄  = C₄H₈O₄

Now to find the grams of each element in the sample;

Express the molecular mass of each element and that of the compound as a fraction and multiply with the given mass;

    For C;

              \frac{4 x 12}{128.1}   x   235\\  = 88.06g

          H; \frac{8 x 1}{128.1}  x  235  = 14.68g

          O: \frac{4 x 16}{128.1} x 235 = 117.41g

learn more:

Mass composition brainly.com/question/3018544

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7 0
3 years ago
An ionic compound is a chemical compound dissociated into positive and negative ions, but globally neutral (it is a bond that us
Firdavs [7]

True

Explanation:

Ionic compounds are chemical compounds that dissociates into positive and negative ions and are globally neutral due to the charge balance. They are made up of metals and non-metals.

  • Ionic bonds are formed between two kinds of atoms having a large electronegativity difference.
  • It is usually between metals and non-metals.
  • The formation of this bond type involves the transfer of electrons from the less electronegative atom such that the two kinds of atoms now have completely filled outer shell like the noble gases.
  • This transfer makes the metal positively charged while the non-metal becomes negatively charged.
  • The atoms forms ions that are oppositely charged.
  • The charges are balanced out leaving a net neutral compound.
  • The electrostatic force of attraction between these ions is the ionic or electrovalent bond.

learn more:

Ionic compound brainly.com/question/6071838

#learnwithBrainly

6 0
3 years ago
Can somebody plz help answer this science questions (only 1-2 sentences is good thx !
Mrac [35]
I believe it’s because they are trying to find other things that won’t pollute the environment as much, and they are also doing this because we are trying to reduce green house gas. Sorry if i’m wrong :(
8 0
3 years ago
The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
Gemiola [76]

Answer:

1

Explanation:

there is only one sulphur (S) atoms in the formula for sodium sulphate

5 0
3 years ago
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