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3 years ago

How is a pair of molecular orbitals formed?

Chemistry

2 answers:

Montano1993 [528]3 years ago

3 0

When two atoms combine, the overlap of their atomic orbitals produces molecular orbitals.

Yanka [14]3 years ago

3 0

Answer:

Explanation:

Molecular orbitals are mathematical functions that define the wave behavior of electrons within molecules, always from the point of view of quantum chemistry. Mathematical functions are used to find physicochemical properties, such as the probability of finding the electron in a given space.

So, according to the theory of molecular orbitals, the covalent bonds of the molecules are formed by overlapping atomic orbitals, so that the new molecular orbitals belong to the entire molecule and not to a single atom. During the formation of a bond, the atomic orbitals approach and begin to overlap, releasing energy as the electron of each atom is attracted by the positive charge of the nucleus of the other atom. The greater the overlap, the greater the release of energy and, therefore, the lower the energy of the molecular orbital. If the process of approximation of atoms continues, the atomic nuclei can repel each other, which causes the energy of the system to increase.

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2 years ago

Consider the substances below.

ratelena [41]

Answer:

They have the same number of atoms. = YES

They have different masses. = YES

Explanation:

1 mol of beryllium

• 1 mol of salt

beryllium = Be = Atomic mass: 9.012182

salt = NaCl = Molar mass: 58.44 g/mol

1 mol of water

• 1 mol of hydrogen

water = H2O = Molar mass: 18.01528 g/mol

hydrogen = H = 1g/mole

Which statement is true about these substances?

They have exactly the same mass. = NO

They have different numbers of particles = NO

They have the same number of atoms. = YES

They have different masses. = YES

Avogadro constant means the number of units in one mole of any substance (defined as its molecular weight in grams) is equal to 6.02214076 × $10^{23}$ .

6 0

2 years ago

How many total atoms of each element are presented in the following formula

Scorpion4ik [409]

Answer:

Aluminium (Al): (3*2)+(5*2)=16

Sulphor (S): (3*1)=3

Oxygen (O): (4*3)+(3*1)=15

7 0

2 years ago

Carbon exists in nature as three isotopes. Given the atomic masses and relative abundance of the isotopes, what is the average a

Ivan

The most abundant carbon isotope is carbon-12.

The relative atomic mass of carbon is 12.011, which is extremely close to 12.0. This means that the masses C-13, and C-14 are practically negligible when contributing to the relative atomic mass of carbon.

the C-12 isotope makes up 98.9% of carbon atoms, C-13 makes up 1.1% of carbon atoms, and C-14 makes up just a trace of carbon atoms as they are found in nature.

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2 years ago

An energy of 6.8 x 10^-19 J/atom is required to cause an aluminum atom on a metal surface to lose an electron.

Nana76 [90]

Wavelength of the light is 2.9 × 10⁻⁷ m.

Explanation:

Planck - Einstein equation shows the relationship between the energy of a photon and its frequency, and they are directly proportional to each other and it is given by the equation as E = hν,

where E is the energy of the photon

h is the Planck's constant = 6.626 × 10⁻³⁴ J s

ν is the frequency

From the above equation, we can find the frequency by rearranging the equation as,

ν = $$ \frac{E}{h}$ = $$ \frac{6.8 \times 10^{-19}}{6.626\times10^{-34}} = 1.03\times10^{15} s^{-1}$

Now the frequency and the wavelength are in inverse relationship with each other.

ν × λ = c

It can be rearranged to get λ as,

λ = c / ν

= $$\frac{3\times 10^{8} ms^{-1}}{1.03\times10^{15}s^{-1}} = 2.9\times 10^{-7} m$

So wavelength is 2.9 × 10⁻⁷ m.

6 0

3 years ago