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NemiM [27]
3 years ago
11

ASAP PLEASE, 25 POINTS!

Chemistry
2 answers:
raketka [301]3 years ago
6 0

The answers D. A carrier

dangina [55]3 years ago
3 0

Hillary is considered to be D. a carrier.

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Calculate the enthalpy of formation of butane, C4H10, using the balanced chemical
melisa1 [442]

Answer:

-125.4

Explanation:

Target equation is 4C(s) + 5H2(g) = C4H10

These are the data equations for enthalpy of combustion

  1. C(s) + O2(g) =O2(g) -393.5 kJ/mol * 4
  2. H2(g) + ½O2(g) =H20(l) = 285.8 kJ/mol * 5
  3. 2CO2(g) + 3H2O(l) = 13/2O2 (g) + C4H10 - 2877.1 reverse

To get target equation multiply data equation 1 by 4; multiply equation 2 by 5; and reverse equation 3, so...

Calculate 4(-393.5) + 5(-285.8) + 2877.6 and you should get the answer.

7 0
3 years ago
Explain specifically how an electron gives off light in an atom.
exis [7]

Answer:

Then, at some point, these higher energy electrons give up their "extra" energy in the form of a photon of light, and fall back down to their original energy level.

Explanation:

When properly stimulated, electrons in these materials move from a lower level of energy up to a higher level of energy and occupy a different orbital.

3 0
2 years ago
Which statements describe seismic waves? Select three options.
Alenkasestr [34]

Answer:

A, C, E

Explanation:

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What adaptations allow a camel and a cactus to survive in warm environments?
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A camel stores fat in its hump, while the cactus stores water in its thick stem.

Explanation:

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Which property of isotopes makes them suitable for determining the dates of ancient artifacts? atomic number of the isotope rate
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Each isotope has a unique rate of decay, making them suitable for determining the dates of ancient artifacts. The answer is "rate of decay of the isotope."
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