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Ad libitum [116K]
4 years ago
12

The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitro

gen?
(A) The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14.
(B) The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7.
(C) The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams.
(D) The nitrogen atom has a mass number of 7 grams and an atomic number of 14.
(E) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
Chemistry
1 answer:
bagirrra123 [75]4 years ago
4 0

Answer:

Statement (E) is correct.

Explanation:

Both mass number and atomic mass are integer. Both are unit less.

Atomic mass is approximately equal to mass number of an atom with an unit of daltons or amu or u.

Mass number = number of protons + number of neutrons

So mass number of N = 7 +7 =14

So, atomic mass of n atom = 14 daltons

Hence statement (E) is correct.

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The entropy for the process:

Cu(s) (350°C and 2.5 atm) → Cu(s) (450°C and 2.5 atm) decreases. The sign of entropy is negative.

<h3>What is Entropy? </h3>

Entropy is defined as the measure of the thermal energy of a system per unit temperature which is unavailable for doing useful work. As the work is obtained from ordered molecular motion, therefore the amount of entropy is also gives a measure of the molecular disorder, or randomness, of a system.

<h3>Effect of Temperature</h3>

There is increase in the Entropy as temperature increases. An increase in the temperature results that particles of substance have greater kinetic energy. The fast moving particles have more disorder than particles which are moving slowly at the given lower temperature.

<h3>Effect of Pressure</h3>

The entropy increases with increases in the pressure on the substance.

Since the temperature of given reaction decreases. So, entropy also decreases.

Thus, we concluded that the entropy for the process:

Cu(s) (350°C and 2.5 atm) → Cu(s) (450°C and 2.5 atm) decreases. So, the sign of entropy is negative.

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Explanation:

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Answer:

a. Remaining at rest requires the use of ATP.

Explanation:

The resting membrane potential is maintained by the sodium-potassium pump. The sodium potassium pump does this by actively pumping sodium ions out of the cell and potassium ions inside the cell in a ratio of 3:2. This movement of ions by the sodium-potassium pump is against their concentration gradient. In a neuron at rest, there are more sodium ions outside the cell than there are inside the cell. Also, there are are more potassium ions inside the cell than there are outside the cell. However, there are ion channels through which these ions enter and leave the cell. Sodium ion channels allow sodium to enter the cell following its concentration gradient, whereas, potassium ion channels allow potassium to leave the cell following its concentration gradient. However, more potassium ions leave the cell than do sodium ions enter the cell because of the higher permeability of the cell to potassium ions.

In order to maintain the resting membrane potential, the sodium potassium pump powered by the hydrolysis of an ATP molecules pumps sodium ions out of the cell and potassium ions into the cell.

<em>Therefore, the correct option is A, as ATP is needed by the sodium-potassium pump in order to maintain the resting membrane potential.</em>

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