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Oxana [17]
2 years ago
8

Mrs. Rosales performed a demonstration of a chemical reaction for her science students. In a well-ventilated room, she added a s

ulfuric acid solution to a beaker containing granulated sugar. The mixture immediately became very hot and released water vapor into the air. The sugar appeared to burn and was transformed into a rapidly growing column of solid black material. The experiment also produced a foul-smelling odor. Which observation about the demonstration does not provide evidence of a chemical reaction? A. The mixture immediately became very hot B.Water vapor was released into the air. C.The mixture released a foul-smelling odor. D.The sugar was transformed into a solid black material​
Biology
1 answer:
Andrej [43]2 years ago
6 0

Answer:

D

Explanation:

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You dilute an unknown sample of bacteria to 1 x 10-6 and plate out 10 onto a Petri dish. The next day you count 64 colonies. The
Sveta_85 [38]

Answer:

b

Explanation:

The correct answer would be 6.4 x 10^6 cells/ul.

For 1 x 10-6 dilution, the plating factor is 10^6. To find the number of bacteria in the original sample, the plating factor is multiplied by the colony count per ul.

<em>Number of viable bacteria = plating factor x colony count/ul</em>

Since 10 ul gives 64 colonies.  1 ul will give:

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Therefore, the viable bacteria in the original sample = 6.4 x 10^6 cells/ul

The correct option is b.

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3 years ago
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Furkat [3]

Answer:

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The energy needed for body's internal activities when at rest is your Active Metabolic Rate.
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