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3 years ago

Suppose that Biuret reagent turns purple when it is added to an unknown substance. What can you conclude about the substance?

Chemistry

1 answer:

Oksi-84 [34.3K]3 years ago

6 0

Answer:

the unknown substance is a protein

Explanation:

The biuret test is one of the tests for proteins. It can be used to detect peptide linkages. The biuret test is carried out in an alkaline solution. A coordination complex is formed leading to the appearance of a violet color.

Summarily, the biuret method is a colorimetric technique used to test for proteins and peptides. It involves the formation of a purple (violet) complex of Copper salts in alkaline solution.

Hence when the biuret reagent is added to an unknown substance and it turns purple, the unknown substance is a protein

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5. The element copper has naturally occurring isotopes with mass numbers of 63

natali 33 [55]

Answer:

63.616

Explanation:

DATA

1. first atomic mass;m1=63

second atomic mass;m2=65
first percentage;p1= 69.2%
second percentage me;p2=30.8%
average mass;avg= ?

SOLUTION

avg= (m1)(p1) + (m2)(p2)

100

avg= (63)(69.2) + (65)(30.8)

100

avg= 4359.6 + 2002

100

avg= 6361.6

100

avg= 63.616

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3 years ago

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As you have seen in this lab, the density of water is near 1 g/cm3. Anything with a density lower than this will float in water,

hammer [34]

The third answer is the one you want. You have to have an adjustable density. All other things being equal, if the tanks you use for holding just water when filled with water will let the sub sink, because the sub is made of a dense metal like iron or steel.

If on the other hand you fill these tanks with air, the net density will be below one and the sub will rise.

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2 years ago

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scientist has discovered a new molecular compound that is a long chain of 26 carbons bonded together, with a methyl group on one

Lelechka [254]

Answer:

Fatty acid

Explanation:

A fatty acid is a carboxylic acid with a long chain of 12 or more carbons.

If the molecule has no other distinguishing features, the compound is hexacosanoic acid, CH₃(CH₂)₂₄COOH.

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3 years ago

1. Which of the following particles are free to drift in metals?

kotegsom [21]

Answer:

electrons

Explanation:

metals do what is called metallic bond

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2 years ago

What dissolved solid has the highest concentration in the ocean? sodium chloride

jeyben [28]

Answer:

chloride and sodium.

Explanation:

These two make up over 90% of all dissolved ions in seawater.

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2 years ago

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