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Marina86 [1]
3 years ago
6

What two substances are indicated by the cobalt chloride and the lime water tests? is it possible that other substances are prod

uced when the candle burns?
Biology
2 answers:
shutvik [7]3 years ago
7 0
The cobalt chloride and lime water test is a test to identify the products of combustion.

Two substances that are indicated by the cobalt chloride and lime water tests are water and carbon dioxide. In this test, the clear lime water turns milky that proves the presence of carbon dioxide. The blue cobalt chloride paper turns pink that proves the presence of water.

No, it is not possible to produce any other substances while burning a candle in this test. When the candle is burning, the substances produced are carbon dioxide and water.
yawa3891 [41]3 years ago
4 0
<span>The two substances indicated with cobalt chloride and lime water tests are carbon dioxide and water. If there is carbon dioxide, the lime water will go cloudy. And to prove the water, if the flask of another water tube is wrapped in cold water, drops of condensed water will form on the outside of the flask. The blue cobalt paper will turn pink with water present.</span>
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If acetyl-CoA is labeled with 14C at its methyl group, how many rounds of the cycle are required before 14CO2 is released?
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14 CO₂ will be released in the second turn of the cycle

Explanation:

<u>Complete question goes like this</u>, "<em>The CO2 produced in one round of the citric acid cycle does not originate in the acetyl carbons that entered that round. If acetyl-CoA is labeled with 14C at the carbonyl carbon, how many rounds of the cycle are required before 14CO2 is released?</em>"

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  • The labeled Acetyl of Acetyl-CoA becomes the terminal carbon (C4) of succinyl-CoA (which becomes succinate that is a symmetrical four carbon diprotic dicarboxylic acid from alpha-ketoglutarate).
  • Succinate converts into fumarate. Fumarate converts into malate, and malate converts into oxaloacetate. Because succinate is symmetrical, the oxaloacetate can have the label at C1 or C4.
  • When these condense with acetyl-CoA to begin the second round of the cycle, both of these carbons are discharged as CO2 during the isocitrate dehydrogenase and alpha-ketoglutarate dehydrogenase reactions (formation of alpha-ketoglutarate and succinyl-CoA respectively).

Hence, 14 CO₂ will be released in the second turn of the cycle.

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