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malfutka [58]
3 years ago
15

In any sample of DNA, the amount of adenine (A) equals the amount of _____.

Chemistry
2 answers:
aivan3 [116]3 years ago
8 0
It is equal to amount of thymine
enyata [817]3 years ago
5 0

<u>Answer:</u> The correct answer is thymine.

<u>Explanation:</u>

DNA is known as deoxy ribonucleic acid. This molecule contains 4 nitrogenous bases, which are adenine (A), thymine (T), cytosine (C) and guanine(G). This molecule forms double helix structure.

Adenine formed two hydrogen bonds only with thymine and cytosine forms three hydrogen bonds only with guanine.

Thus, the amount of adenine (A) will be equal to the amount of thymine (T).

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Which of the following pure compounds will exhibit hydrogen bonding?
zimovet [89]

Explanation:

For a compound to show hydrogen bonding it is necessary that the hydrogen atom of the compound should be attached to more electronegative atom like fluorine, oxygen or nitrogen.

For example, CH_{3}CH_{2}OH, CH_{3}NH_{2} and NH_{3} all these compounds contain an electronegative atom attached to hydrogen atom.

Therefore, these pure compounds will exhibit hydrogen bonding.

Thus, we can conclude that out of the given options CH_{3}CH_{2}OH, CH_{3}NH_{2} and NH_{3} are the pure compounds which will exhibit hydrogen bonding.

4 0
3 years ago
Lithium (Li): 1s 2sB<br> A=<br> B=
topjm [15]

Answer:

A = 2

B = 1

Explanation:

The atomic number of lithium is 3.

Its atomic mass is 7 amu.

It is present in group group 1.

It has one valance electron.

Lithium is alkali metal it form salts.

It is silvery soft metal. It has lowest density as compared to all other metals.

It react vigorously with water.

It is used in rechargeable batteries which are used in camera, mobile, laptops etc.

The electronic configuration of Li:

Li₃ = 1s² 2s¹

Thus,

A = 2

B = 1

8 0
2 years ago
Question 5
Dafna11 [192]

The mass percent of oxygen is 32.82%.

<h3>What is a noble gas?</h3>

A noble gas is member of group 18 in the periodic table. The members of this group are known not to be reactive and they do not easily form compounds. However, there have been few compounds of the members of group 18 that have been reported.

Let us now calculate the relative molecular mass of xenon tetraoxide.

Xe + 4 (O)

131 + 4(16) = 195

Given that the mass of oxygen in the compound is 64, the mass  percent of oxygen in xenon tetroxide is obtained from;

64/195 * 100/1

= 32.82%

Learn more about mass percent:brainly.com/question/5394922

#SPJ1

5 0
1 year ago
Point G is the center of the small circle. Point X is the
Dafna1 [17]

Answer:

C

Explanation:

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4 0
3 years ago
A researcher wants to test the solubility (property of being dissolved) of salt in water as the temperature of the water increas
Leya [2.2K]
The researcher may first weight the beaker with water and then start to heat the water to a constant temperature, for example 30 °C and then start adding salt and stirring. He should add salt slowly until solid salt starts to become visible and the solution starts becoming cloudy. When this happens, he should quickly weigh the beaker. The increase in mass is the mass of salt dissolved at that temperature.
The procedure is then repeated but at an increased temperature until 5-6 temperatures have been tested.
3 0
3 years ago
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