Select all that apply. Consider this system: CH3COOH(aq) H+(aq) + CH3COO- Ka = 1.8 x 10-5
What will happen to the equilibrium as OH- ions are added?
A) H+ will combine with OH- to form water.
B) [CH3COOH] will increase.
C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.
E) The reaction will move to the left.
Answers
The equilibrium as OH- ions are added;
A) H+ will combine with OH- to form water.
C) The acid will dissociate to supply more H+.
D) The reaction will move to the right.
Answer : The correct options are, (A), (C) and (D)
Explanation :
Le-Chatelier's principle : It states that if any change in the variables of the reaction, then the equilibrium will shift in that direction where the effect will be minimum.
The balanced equilibrium reaction will be,
As the concentration of are decreased, the equilibrium will shift in a direction where concentration of
is increasing and thus the dissociation of acid will increase to supply more of
ions. During this process the reaction will move to the right direction.
In the given equilibrium reaction when the are added then the
ion will combine with
ion to form water.
Hence, the correct options are, (A), (C) and (D)
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Answers
Answer is: (3) 2–8–17–6.
1) This is ground state of sodum atom.
Electron configuration of sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
Atomic number of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.
2) This is ground state of sulfur atom.
Sulfur electron configuration: ₁₆S 1s²2s²2p⁶3s²3p⁴.
Sulfur has six valence electrons (3s²3p⁴), in 3s orbital, two electrons are paired, in 3p orbital, two electrons are paired and two are unpaired.
4) This is ground state of arsenic atom.
Electron configuration of arsenic atom:
₃₃As 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³.
Electron configuration represents an excited state : (3) 2–8–17–6
Further explanation
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
- s: 2 electrons
- p: 6 electrons
- d: 10 electrons and
- f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Determination of electron configurations based on principles:
- 1. Aufbau: Electrons occupy orbitals of the lowest energy level
- 2 Hund: electrons fill orbitals with the same energy level
- 3. Pauli: no electrons have the same 4 quantum numbers
According to Niels Bohr, electrons surround the nucleus of an atom on a path called the electron shell. Each shell has an energy level. The further from the core, the higher the energy level
Maximum electrons of shells :
- K shell: 2 electrons
- L shell: 8 electrons
- M shell: 18 electrons
- N shell: 32 electrons
- O shell: 50 electrons
- P shell: 72 electrons
The maximum number of electrons in each shell can be formulated = 2n² (n = shell number)
Electrons can move the shell up or down by releasing energy or absorbing energy
Excited electrons show higher electron transfer to the shell by absorbing energy
So it can be concluded that there are 2 conditions :
Ground state is the state of electrons filling skins with the lowest energy levels.
Excited state is the state of electrons which occupy a higher energy level
The state of excited electrons can be seen from the presence of electrons which do not fill the skin completely but fill the skin afterwards
From the electron configuration , option 3 shows the excitation of one electron in the M shell towards the N shell, which should have a configuration in the ground state:
2–8–18–5
Learn more
element X
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Keywords: electron configurations, the shell of atoms, excited state
Answers
The given value is
Since, so:
=
Since, so:
Hence, 9.7 kilometers per liter of gasoline is .
Answers
Tetra phosphorous octa bromide is the compound name for P4Br8.
What is compound?
A substance is from a combination of two or more different chemical elements. They are pure chemical substances found in nature.
- The smallest unit of a compound is molecule.
- Both phosphorous and bromide are on the right side of the periodic table.
- Both phosphorous and bromide form covalent bond.
- Atomic weight of phosphorous is 30.97 and atomic number is 15.
- Atomic weight of bromine is 79.9 and atomic number is 35.
The name is tetra because there are 4 phosphorous and octa means there is 8 bromide.
The ratio of phosphorous and bromide is 4:8.
Tetra phosphorous octa bromide is the compound name for P4Br8.
Learn more about compounds here:
#SPJ6
Hope that helps!
Answers
Answers
Answer:
no
Explanation:
it is not endothermic reaction
Physical
Both
Answers
Answer:
Chemical
Explanation: