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3 years ago

What is the main exception in the atomic radius? Explain.

Chemistry

1 answer:

yarga [219]3 years ago

7 0

Answer:

The atomic radius of atoms generally decreases from left to right across a period. There are some small exceptions, such as the oxygen radius being slightly greater than the nitrogen radius. Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level.

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To completely convert 9. 0 moles of hydrogen gas (h2) to ammonia gas, how many moles of nitrogen gas (n2) are required?

evablogger [386]

To completely convert 9. 0 moles of hydrogen gas (h2) to ammonia gas, 3.0 moles of nitrogen gas (n2) are required.

<h3>What are moles?</h3>

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

<h3 />

The given reaction is $\rm N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$

By the stoichiometry rule of ratio hydrogen: nitrogen

3 : 1

The reacted moles of nitrogen is equals to H/3 moles of reacted hydrogen

So, moles of nitrogen

$\rm Moles\; of\; nitrogen = \dfrac{9.0 }{3} =3.0\;mol$

Thus, 3.0 moles of nitrogen gas (n2) are required.

Learn more about moles

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2 years ago

This is the speed at which molecules or atoms move dependent on temperature and state of matter.

Lynna [10]

Molecular Motion is the speed at which molecules or atoms move dependent on temperature and state of matter.

Explanation:

All molecules are in constant motion. Molecules of a liquid have a lot of freedom of movement than those in an exceedingly solid. Molecules in an exceedingly gas have the best degree of motion.

Heat, temperature and also the motion of molecules area unit all connected. Temperature could be a life of the common K.E. of the molecules in an exceedingly material. Heat is that the energy transferred between materials that have completely different temperatures. Increasing the temperature will increase the travel motion of molecules Energy is expounded to temperature by the relationship.

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3 years ago

Read 2 more answers

1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus,

postnew [5]

<h3>1. Answer;</h3>

a. the strong nuclear force is much greater than the electric force.

<h3>Explanation;</h3>

For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently.
Therefore, an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.
Small atoms are stable; this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together.

<h3>9. Answer;</h3>

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will change into a different element altogether.

<h3> Explanation;</h3>

Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
Uranium-238 is an example of such atom, which may undergo decay to achieve stability.
Alpha decay is one of the types of decays, others being beta decay and gamma decay. In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.
Therefore, Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234.

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3 years ago

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The heat of vaporization of water is 540 cal/g. How much heat is needed to change 4.28g of water to steam?

damaskus [11]

Answer:

2311.2 cal

Explanation:

540 cal / g * 4.28 g = 2311.2 cal

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2 years ago

A store has notebooks worth $1.60. The store adds a 30% markup. How much is the markup?

Hoochie [10]

Answer: $0.48

Explanation: $1.60×0.30= 0.48

6 0

3 years ago