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bearhunter [10]
3 years ago
8

A teacher is teaching a lesson on energy transformations. Which explanation is the best at comparing the amount of energy contai

ned in a granola bar you eat for breakfast and the amount of mechanical energy used to walk to school. A. the amount of chemical energy in the granola bar is equal to the mechanical energy B. the amount of chemical energy in the granola bar is less than the mechanical energy C. the amount of chemical energy in the granola bar is greater than the mechanical energy D. the energy amounts cannot be compared
Chemistry
2 answers:
LenKa [72]3 years ago
4 0
I believe it’s b though not sure
poizon [28]3 years ago
4 0

Answer:

D

Explanation:

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For the answer to answer above, <span>O - Ordered structure </span>
<span>H - maintain Homeostasis with the environment </span>
<span>S - respond to Stimuli from the environment </span>
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4 years ago
In an experiment, a compound was determined to contain 68.94% oxygen and 31.06% of an unknown element by weight. The molecular w
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Answer is: the compound is B₂O₃.

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ω(O) = 0.6894; percentage of oxygen in the compound.

ω(X) = 31.06% ÷ 100%.

ω(X) = 0.3106; percentage of unknown element in the compound.

If we take 69.7 grams of the compound:

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n(compound) = 69.7 g ÷ 69.7 g/mol.

n(compound) = 1 mol.

n(O) = (69.7 g · 0.6894) ÷ 16 g/mol.

n(O) = 3 mol.

M(compound) = n(O) · M(O) + n(X) · M(X).

n(X) = 1 mol ⇒ M(X) = 21.7 g/mol; there is no element with this molecular weight.

n(X) = 2 mol ⇒ M(X) = 10.85 g/mol; this element is boron (B).

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Answer:

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Explanation:

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Are you referring to DNA? 
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