3 years ago

Which of the following statements is true?

Biology

1 answer:

almond37 [142]3 years ago

8 0

B is the only true statement

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I think the correct answer would be D. In the process of petrification, a tree burning is not included. Petrification is a process that involves organic materials turning into fossils by replacing the original contents of a certain object with minerals.

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3 years ago

Which structure is the arrow pointing to

Vikki [24]

Answer:

Nucleus

Explanation:

It is the unit of heredity and it controls the activities of the cell

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3 years ago

Nitrogen gas reacts with hydrogen gas to form ammonia What are reactants in this chemical reaction?

krek1111 [17]

1 mol 2 mol

84g of N2(g) = 84/28 = 3 mol of N2(g)

From the above reaction 1 mol of N2(g) gives 2 mol 0f NH3(g). So 3 mol of N2(g) should give 6 mol or (6x17) 102 g of NH3(g). But we are getting only 85.0 g of NH3.

Hence %yield of NH3 = 100x85.0/102 = 83.3%

Answer D. is correct.

2. 2HgO (s) --------------------- 2Hg (l) + O2 (g)

2 mol 2 mol 1 mol

4 mol 4 mol 2 mol

As only 1.5 mol of O2 is obtained, so % yield = 1.5x100/2 = 75.0%

Moreover 603 g of Hg = 603/200.59 = 3.00 molof Hg. Considering this also

% yield = 3x100/4 = 75%

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3 years ago

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A student does an experiment for a science fair to study whether temperature affects the timing of a cricket’s chirps. The stude

Oduvanchick [21]

timing of the cricket’s chirps

Explanation:

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3 years ago

Draw and label a segment of dna showing its helix and complementary base pairing

mafiozo [28]

Attached are two images concerning DNA.

The first image is a diagram that illustrates the base paring of DNA. First, there is the ribose-phosphate backbone that keeps the DNA together. Then the bases thymine and adenine are joined together by two hydrogen bonds. On the other hand, the bases guanine and cytosine are joined together by three hydrogen bonds.

The second image shows the helical structure of the DNA.

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3 years ago

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