CHEMISTRY HIGH SCHOOL

The wave-mechanical model of the atom is required to explain the(1) mass number and atomic number of an atom
(2) organization of atoms in a crystal
(3) radioactive nature of some atoms
(4) spectra of elements with multielectron atoms

Answers

Answer 1
Answer: Answer: option (4) spectra of elements with multielectron atoms.


Explanation:


1) The spectrum is the set of electromagnetic wave frequencies emitted by the atoms.


2) Such emssions are explained by the wave-mechanical model of the atom as the release of energy (photons, which is the same that light) when an excited electron jumps into a lower energy level.


3) As per the wave-mechanical model of the atom, the electrons are not able to occupy any position around tha atom, but some specific energy levels, and it is the change of energy level (jump of the electrons from one level to other) what produces the spectrum.
Answer 2
Answer:

Final answer:

The wave-mechanical model of the atom explains the spectra of elements with multielectron atoms by describing electrons as wave-like particles with discrete energy levels. This leads to the unique patterns of spectral lines observed for different elements.

Explanation:

The wave-mechanical model of the atom is used to explain the spectra of elements with multielectron atoms. The model, also known as the quantum mechanical model, describes electrons as wave-like particles with discrete energy levels. These energy levels give rise to the unique spectral lines observed for different elements.

For example, when an electron in an atom absorbs energy, it jumps to a higher energy level. When it returns to its original energy level, it releases the absorbed energy in the form of light. Each element has its own set of energy levels, leading to a unique pattern of spectral lines.

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Given the equation representing a closed system:N2O4(g) <=> 2NO2(g)Which statement describes this system at equilibrium?
(1) The volume of the NO2(g) is greater than the volume of the N2O4(g)
(2) The volume of the NO2(g) is less than the volume of the N2O4(g)
(3) The rate of the forward reaction and the rate of the reverse reaction are equal
(4) The rate of the forward reaction and the rate of the reverse reaction are unequal

Answers

Answer: The correct option is (3).

Explanation:

N_2O_4(g)\rightleftharpoons 2NO_2(g)

An equilibrium in a reversible chemical reaction is a state in which concentration of reactants and products do not change with time. At equilibrium the rate of forward reaction is equal to the rate of backward reaction.

So, from the given statements the correct statement describing the given system at equilibrium is statement numbered '3'
3., the equation is balanced so the forward and reverse reactions are equal

(adapted)According to this passage, those who adopted this
pledge believed that
(1) religion had no place in national politics
(2) Congress should repeal Prohibition
(3) alcohol consumption was damaging to society
(4) only the government can solve social
problems

Answers

According to this passage, those who adopted this pledge believed that alcohol consumption was damaging to society. The answer is number 3.

The volume of a gas decreases from 15.7 m3 to 11.2 m3 while the pressure changes from 1.12 atm to 1.67 atm. If the initial temperature is 245 K, what is the final temperature of the gas

Answers

The final temperature of the gas is 260.01 K.

 The final temperature can be calculated by using the equation as follows:-

(P_(1)V_(1) )/(T_(1)) =(P_(2)V_(2) )/(T_(2))........(1)

Here, P_1 and P_2  is the pressure of this gas before and after the changes.

V_1  and V_2 is volume of this gas before and after the changes.

T_1 and T_2 is the temperature (in degrees Kelvins) of this gas before and after the changes.

Given values:-

P_1=1.12\ atm, P_2=1.67\ atm\n\nV_1=15.7\ m^(3) , V_2=11.2\ m^(3)\n\nT_1=245\ K.T_2=?

Substitute all the values in the equation (1) as follows:-

(1.12\ atm*15.7\ m^(3))/(245\ K ) =(1.67\ atm*11.2\ m^(3))/(T_2 )\nT_2=(1.67\ atm*11.2\ m^(3)*245\K)/(1.12\ atm*15.7\ m^(3) )\n=260.60\ K

Hence, the final temperature of the gas is 260.60 K.

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Explanation:

The data is given as follows.

P_(1) = 1.12 atm,              P_(2) = 1.67 atm

V_(1) = 15.7 m^(3),           V_(2) = 11.2 m^(3)

T_(1) = 245 K,                  T_(2) = ?

Therefore, calculate the final temperature using the relation as follows.

    (P_(1)V_(1))/(T_(1)) = (P_(2)V_(2))/(T_(2))

    (1.12 atm * 15.7 m^(3))/(245) = (1.67 atm * 11.2 m^(3))/(T_(2))

 T_(2) = (1.67 atm * 11.2 m^(3) * 245 K)/(1.12 atm * 15.7 m^(3))

                  = (4582.48 K)/(17.584)

                  = 260.605 K

                  = 260.61 K (approx)

Thus, we can conclude that final temperature is 260.61 K.

If you were asked to describe metals and magnetism you could say. A. non–paired electrons spin in opposite directions in all metals, creating a magnetic field. B. metals are magnets because they have more electrons than non–magnetic materials. C. metals can become magnetic if they have many spinning electrons that create magnetic fields. D. the electrons in some metals pair up to create a magnetic field.

Answers

Answer : Option D) the electrons in some metals pair up to create a magnetic field.


Explanation : Most of the metalsare magnetic in nature including some exceptions. When the unpaired electrons get aligned with the magnetic field they posses magnetism. Also there are some paired electrons in metals which align themselves according to the magnetic field and create magnetism in them.

The correct answer is C;  Metals can become magnetic if they have many spinning electrons that create magnetic fields.

Further Explanation;

As long as there are many spinning electrons anything metal will become magnetic. Ferromagnetic is when there are only some certain types of metals that are attracted to magnetic. If you were to make an electromagnet, you would only need to take an insulated wire and wrap it around the metal that has ferromagnetic properties.

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Which elements are included in Group 5A?

Answers

Answer : The elements include in group 5A are, Nitrogen, phosphorous, arsenic, antimony and bismuth.

Explanation :

According to the modern periodic table, the group 5A is known as group 15. And it is also known as nitrogen family.

The elements present in group 5A are, nitrogen (N), phosphorous (P), arsenic(As), antimony(Sb) and bismuth (Bi).

The general electronic configuration of group 5A elements is, ns^2np^3

The number of valance electrons present in group 5A elements are, 5

Hence, the elements include in group 5A are, Nitrogen, phosphorous, arsenic, antimony and bismuth.

Final answer:

Group 5A, also called Group 15 in the modern IUPAC system, contains the elements Nitrogen, Phosphorus, Arsenic, Antimony, Bismuth, and the synthetic element Moscovium. Each of these elements has a p3 configuration in their valence shell.

Explanation:

The elements present in Group 5A (Group 15 in IUPAC system) are known as the pnictogens. This group includes Nitrogen (N), Phosphorus (P), Arsenic (As), Antimony (Sb), Bismuth (Bi) and the unconfirmed synthetic element Moscovium (Mc). These elements, each with a p3 configuration in their valence shell, form compounds with a wide range of properties and uses.

Nitrogen is a common gas in the Earth's atmosphere, deeply involved in biological processes. Phosphorus is key in DNA and energy processes in living beings. Arsenic, Antimony, and Bismuth are metalloids used in various industrial applications. Moscovium is a synthetic element not found naturally and its properties are being studied.

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[17]. Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trinix 10/50 has a total pressure of 2.07 x 10^4 kPa, then what is the partial pressure of nitrogen? a). 1.04 x 10^4 kPa
x b). 8.3 x 10^3 kPa
c). 2.07 x 10^3 kPa
d). 2.07 x 10^4 kPa

Answers

The answer is B. 8.3x10^3 kPa. The partial pressure of a specific gas in a gas mixture is equivalent to product of its mole fraction and total pressure of the mixture. Since it was stated that the mixture is 10% oxygen, 50% helium, and the rest nitrogen, it can be determined that nitrogen is 40% of the mixture. So 40% of 2.07x10^4 kPa is 8.3x10^3 kPa.

Answer:

A) 1.04 x 10^4 kPa

Explanation:

I'm not exactly sure how but I took the test and this was the correct answer. My calculations said it was B as well but I guess not...
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