3 years ago

What are sister chromatids

1 answer:

4 0

Sister chromatids are two identical copies of a single chromosome that are connected by a centromere. They occur as a result of a chromosome that duplicated during the S phase of the cell cycle.

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2 years ago

Determine the mass in grams of 4.69 x 1021 atoms of barium. (The

Virty [35]

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1.07 g Ba

Explanation:

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In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:

$4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa$

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3 years ago

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valentinak56 [21]

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Option A. The polar solvent molecule surrounds the positive sodium ions and the negative chloride ions.

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When a salt say NaCl dissolved in water, the solvent molecules surround both the Na+ and Cl-. The Na+ are surrounded by OH- and the Cl- are surrounded by H+.

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