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Leno4ka [110]
3 years ago
14

While hiking in the woods, you see a brown, rotting apple lying on the ground. What changes is the physical properties of the ap

ple are signs that a chemical reaction has occurred?
Chemistry
1 answer:
mojhsa [17]3 years ago
3 0

Answer:

The change in color.

Explanation:

The apple turn brown in color because of the oxidation process. When the oxygen and water molecules in air react with it, oxidation take place. The oxidation process is very efficient in ambient temperature.

For example, if the peal off apple is placed into the refrigerator it take a time to got oxidize and turn brown, but if it is placed in room temperature it quickly turn brown.

when oxygen is react with peel off apple , it trigger the polyphenol oxidase enzyme to oxidize the phenolic compound and quinones are formed which then react with amino acids and produced brown color.

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What amount of heat is released when the temperature of 450.0 g of a
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Answer:

\boxed {\boxed {\sf 4038.48 \ Joules}}

Explanation:

Since we are given the mass, specific heat, and change in temperature, we should use this formula for heat:

q=mc\Delta T

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m= 450.0 \ g \\c= 1.264 \ J/g \textdegree C\\\Delta T= 7.1 \ \textdegree C

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q= (450.0 \ g)(1.264 \ J/g \textdegree C)(7.1 \ \textdegree C)

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Multiply again. This time, the degrees Celsius cancel out.

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<u>4038.48 Joules</u> of heat energy are released.

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Describe how you could use two LB/agar plates, some E. coli, and some ampicillin to determine how E. coli cells are affected by
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If the ampicillin affects negatively E. coli colonies, we are going to observe that in plate 1 (control plate) there are E. coli colonies growing, but in plate 2, there is no E. coli colonies or, at least, there is a fewer number of colonies on it. If ampicillin doesn't affect E.coli, plate 1 (control) and plate 2 (ampicillin experiment) are going to be similar in number of colonies.

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