How many unpaired electrons are present in a ground-state atom from each of the following groups?
(c) 1A(1)
Answers
For 1A(1)
Electronic configuration \(ns^1\)
So, there is 1 unpaired electron present in group 1A(1).
What are Unpaired Electrons?An unpaired electron is an electron that doesn't form part of an electron pair when it occupies an atom's orbital in chemistry.Each of an atom's three atomic orbitals, designated by the quantum numbers n, l, and m, has the capacity to hold a pair of two electrons with opposing spins.Unpaired electrons are extremely uncommon in chemistry because an object carrying an unpaired electron is typically quite reactive. This is because the production of electron pairs, whether in the form of a chemical bond or as a lone pair, is frequently energetically advantageous.They play a crucial role in describing reaction pathways even though they normally only appear momentarily during a reaction on a thing called a radical in organic chemistry.To learn more about unpaired electrons with the given link
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Related Questions
20 points!! Please help me! Will mark Brainliest!! complete the following word equations:) also write the balanced equation, full ionic equation, and net ionic equation. Also include the states:)
a) zinc nitrate + calcium sulphide—>
b) potassium + calcium chloride—>
Answers
Answer:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.
The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.
a) zinc nitrate + calcium sulphide \(\rightarrow \) zinc sulphide + calcium nitrate
balance equation : \(Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)\)
total ionic equation :
\(Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)\)
net ionic equation :
\(Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)\)
b) potassium + calcium chloride \(\rightarrow \) potassium chloride + calcium
balance equation : \(2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)\)
total ionic equation :
\(2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca\)
net ionic equation: \(2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca\)
What is the pH of a buffer solution prepared by mixing 20.0 mL of 0.0800 molL−1NaOH with 20.0 mL of 0.130 molL−1 cacodylic acid?
Answers
Answer:
pH = 6.20
Explanation:
The pKa of cacodylic acid is 6.
To solve this question we must use Henderson-Hasselbalch equation:
pH = pKa +log [A⁻] / [HA]
Where pKa is the pKa of the weak acid = 6
And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.
The moles of the NaOH added to the solution of the weak acid are = Moles A⁻
And moles HA = Initial moles HA - Moles NaOH added
Initial moles HA:
0.0200L * (0.130mol / L) = 0.00260 moles
Moles NaOH:
0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]
Moles HA =
0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]
pH = 6 +log [0.00160 moles] / [0.00100 moles]
pH = 6.20The pH of the resulting solution is 1.6.
Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;
HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)
Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles
Number of moles of HA = 20.0/1000 × 0.130 = 0.0026 moles
We can see that the HA is in excess, Number of moles of excess acid =
0.0026 - 0.0016 = 0.001 moles
Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L
Molarity of excess acid = 0.001 moles/0.004 L = 0.025 M
pH = -log[H^+]
pH = -log[0.025 M]
pH = 1.6
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define a shadow plz help
Answers
Answer:
A shadow is that thing that follows you everywhere when the sun is out. It's creepy!
Explanation: Hope I helped!
Answer:
A shadow is a dark form that you cannot touch, hear, feel, or taste. It's simply formed when an object blocks a source of light.
How many electrons, protons, and neutrons are in a neutral atom of the following isotope of calcium?
Answers
There are a number of subatomic particles in Calcium. The number of electrons, protons and neutron in a neutral atom of the Calcium (Ca) is 20,20 and 20.
Calcium (Ca) is the one of the chemical compound in periodic table. Calcium comes from minerals that needed by body. The atomic mass in calcium is equal to 40,078 u. Calcium has an atomic number of 20. This means that all calcium atoms contain 20 protons. Since a stable atom has a net charge of 0, it must have 20 electrons. The number of neutrons will be the same as the number of protons which is 20.
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Which of these statements is true about heat?
Answers
Answer:
Explanation:
what are the statments i can't help till i have the posable answers
What is the density of an object with volume of 5.36 mL and mass of 58.3
g?
O 10.9 g/mL
O 10.8 g/mL
O 10.87 g/mL
O 10.88 g/mL
Answers
Answer:
option d is correct
Explanation:
Baking soda is sodium bicarbonate, NaHCO3, and vinegar is primarily acetic acid, HC2H3O2. When baking soda is added to vinegar, the resulting reaction produces a tremendous amount of gas, as shown in this video. NaHCO3(s) + HC2H3O2(aq) rightarrow Complete this equation for the reaction of NaHCO3(s) with HC2H3O2(aq). Include phase symbols. NaHCO3(s)+ HC2H3O2(aq) rightarrow
Answers
NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)
This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate.
The balanced equation for the reaction of NaHCO3(s) with HC2H3O2(aq) including phase symbols is
NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)
Baking soda, also known as sodium bicarbonate, is a white, crystalline powder with the chemical formula NaHCO3. It is an alkaline substance that neutralizes acids.
Vinegar is mostly composed of acetic acid, HC2H3O2, which is a weak acid. Vinegar has a sour flavor and a strong smell due to the presence of acetic acid.
NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq) This equation represents the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid) to generate carbon dioxide gas, water, and sodium acetate. When the baking soda and vinegar are combined, a chemical reaction occurs, causing carbon dioxide gas bubbles to form. This is due to the reaction between the acid and base in the mixture, which generates carbon dioxide gas as a byproduct. This reaction is commonly used in baking as a leavening agent to make cakes, muffins, and other baked goods rise.
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how much does carbon cost?
Answers
Answer:
50 pero tom so 50 dollares
In Niels Bohr’s model of the atom, how are electrons configured?
Answers
In Niels Bohr’s model of the atom, electrons are configured in a series of concentric shells around the nucleus. The shells are numbered, with the shell closest to the nucleus being numbered one, and each succeeding shell numbered two, three, and so on.
The electrons in the innermost shell have the lowest energy, while those in the outermost shell have the highest energy. Each shell can hold a certain number of electrons. The first shell can hold up to two electrons, the second shell up to eight electrons, and the third shell up to 18 electrons. Electrons fill the shells in a specific order, following the Aufbau principle. The principle states that electrons will occupy the lowest available energy level before filling higher levels. Electrons in the same shell have the same energy. Electrons in different shells have different amounts of energy, which corresponds to the distance of the shell from the nucleus. When an electron absorbs energy, it can move to a higher energy level. When an electron loses energy, it can move to a lower energy level. Electrons can also move between atoms, which is the basis of chemical reactions.For such more question on concentric shells
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what is the ph of a solution obtained by dissolving two extra-strength aspirin tablets, containing 470 mg of acetylsalicylic acid each, in 270 ml of water?
Answers
The ph of a solution obtained by dissolving two extra-strength aspirin tablets of mass 470 mg of acetylsalicylic acid is 2.58.
What is mass?Mass refers to the amount of matter in the physical body. It is also a measure of body inertia, resistance to acceleration when a net force is applied.An object's mass also determines the strength of gravity on other objects. The SI unit of mass is Kg. Mass (symbol m) is a dimensionless quantity that describes the amount of matter in a particle or object. The standard unit of mass in the international system is "SI". Kilograms (kg). The terms mass and weight are often used interchangeably, but they have very different meanings. The mass is the same wherever one goes in space. Weight, on the other hand, varies from place to place.Each tablet has a mass of 470 mg. The mass of 2 tablets is 2 × 470 mg = 940 mg = 0.940 g
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a sample of 1.7×10^23 molecules of silicon is ____ moles.
Answers
Answer:
0.28moles of silicon
Explanation:
Given parameters:
Number of molecules of silicon = 1.7 x 10²³molecules
Unknown:
Number of moles of the silicon = ?
Solution:
A mole of any substance contains the Avogadro's number of particles.
1 mole of a substance contains 6.02 x 10²³molecules;
So;
1.7 x 10²³molecules contains \(\frac{1.7 x 10^{23} }{6.02 x 10^{23} }\) = 0.28moles of silicon
How many moles are represented by 9.34 x 1021 sodium atoms
a. 1.25x10^2 moles
b. 1.55x10^3 moles
c. 1.55x10^2 moles
d. 1.55 moles
Answers
Answer:
1.55×10⁻² moles of sodium
Explanation:
Given data:
Number of atoms of sodium = 9.34×10²¹ atoms
Number of moles of sodium = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
9.34×10²¹ atoms × 1 mol / 6.022 × 10²³ atoms
1.55×10⁻² mol
Assuming that the pauli exclusion principle remains valid in the distant universe, what is the maximum number of electrons that can populate a given orbital there?.
Answers
The maximum number of electrons that can populate a given orbital is two assuming that the pauli exclusion principle remains valid.
What is pauli exclusion principle and what is the maximum number of electrons that can populate a given orbital there?Pauli exclusion principle which was discovered by pauli states that no two electron in the same atom can have same values for the quantum numbers.Here the question is asked of the maximum number of electrons that can populate a given orbital there.Assuming that the pauli exclusion principle remains valid in the distant universe the maximum number of electrons that can populate a given orbital is 2 .Pauli exclusion principle also states that no two electrons in a solid have same energy states.Hence there are two electrons maximum that can populate the orbital assuming the pauli exclusion principle remains valid.To know more about electrons visit:
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draw the product for the hydroxylation of a mixture of cis- and trans-3-methyl-2-hexene.
Answers
A mixture of cis- and trans-3-methyl-2-hexene is hydroxylated, as shown in the diagram below. The most common definition of hydroxylation in chemistry is a chemical process.
A hydroxyl group is added to an organic molecule as a result (OH).The degree of hydroxylation refers to how many OH groups are present in a given molecule (ii). the process of hydroxylation. A hydrocarbon utilised in organic chemistry is hexene, which has the chemical formula C6H12. A chemical with two carbon atoms joined by a double bond is known as an alkene, and the prefix "-ene" denotes its presence. The word "hex" comes from the fact that the molecule has six carbon atoms in it.
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2
Next →
Physical Changes Versus Chemical Changes: Mastery Test
Submit Test
2
Select the correct answer.
The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. This simple process is
which kind of a change?
ОА a physical change
B. a chemical change
ca nuclear change
OD. an lonic change
Answers
Consider the coordination compound [Cu(H2O)4]NO3. What is the geometry of the complex ion?
A) square planar
B) trigonal planar
C) tetrahedral
D) octahedral
Answers
The geometry of the complex ion \([Cu(H_2O)_4]NO_3\) is C) tetrahedral. In this complex, the central copper ion (Cu) is surrounded by four water (\(H_2O\)) ligands, arranged in a tetrahedral geometry.
A coordination compound is formed between a metal ion and one or more ligands. The metal ion in a complex is also known as the central atom or cation, and the surrounding atoms or molecules are known as ligands. A complex is an ion or molecule consisting of a central metal ion and ligands attached to it. Ligands are molecules or ions that can donate a pair of electrons to the central atom. Ligands bond to the central atom through coordination bonds, also known as dative covalent bonds.
In \([Cu(H_2O)_4]NO_3\), copper(II) ion, Cu²⁺, is the central atom, which is coordinated to four water molecules, \(H_2O\), acting as ligands. It is a tetrahedral coordination compound, as copper(II) ion is bonded to four water molecules that are arranged around it in a tetrahedral geometry.
Hence , The nitrogen-containing anion, \(NO_3^-\), is not directly bonded to the metal ion, Cu²⁺, but it is present in the structure as a counterion. Therefore, the correct answer is option C - tetrahedral.
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The diagram of a water molecule above has the bond between the hydrogen and the
oxygen labeled. Why does the hydrogen atom and the oxygen atom bond?
A. atoms bond because there is just an attraction between atoms. There is nothing made of matter that holds them together
B. atoms Bond because they produce some thing that makes them stick together. The thing that holds them together is a substance made up of matter
C. atoms bond because the structure of an atom has a part that connects it to another atom that is made of matter
D. Atoms do not bond
Answers
Answer: A
Explanation: because of its positive and negative charges
What vale is represented by the symbol Mr
Answers
the answer for this question is Mister
An element contains only one kind of
A. particle. B. property. C. protein. D. raw material.
Answers
Answer:
A
Explanation:
an element contains only one kind of particle
Read the passage.
The central conflict in the story can best be described as
struggle between
A
the boss and Schmitty.
;
5
B
the narrator and the newsies.
's
С
the newsies and the older gentleman buying a pape
ar
D the boss and Rothlisberger.
Answers
Answer:
the narrator and the newsies
Which is one source of the sediments that form sedimentary rocks?
Answers
Answer:
Sandstone, limestone, and shale
Explanation:
The rocks are most likely to start as sediments carried in rivers and end up in lakes and oceans
Answer:
D - materials dissolved in solutions
Explanation:
EDGE 2021
Help please ! Need by tomorrow
Answers
M is equal to (molar mass) (molar volume) (density).
Let's first translate the temperature into Kelvin:
T = 25°C + 273.15 = 298.15 K
The pressure will now be converted to an atm:
760 mm Hg equals 1 atm
Pressure is equal to 740 mm Hg times 760 mm Hg/atm, or 0.9737 atm.
Let's use the ideal gas law equation to determine the molar volume now:
PV = nRT
V is equal to (RT) / P is equal to (0.0821 L atm/mol K) (298.15 K) / (0.9737 atm).
V ≈ 24.93 L/mol
Now, using the provided density, let's get the molar mass:
M = (5.8 g/L) (24.93 L/mol) = (density) (molar volume)
M ≈ 144.394 g/mol
The gas's molar mass is therefore most closely associated with 144.394 g/mol.
The empirical formula for the gas, CH2, reveals the proportional proportion of hydrogen to carbon atoms in the gas. The computed molar mass, however, is considerably more than the molar mass of the empirical formula. This implies that the gas's true molecular composition must have more atoms.
We determine that the ratio is around 3.33 by comparing the molar mass of the empirical formula (14.03 g/mol) to the molar mass of the gas (46.61 g/mol). This suggests that a multiple of the empirical formula makes up the gas' molecular formula.
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HELP PLEASE , ITS DUE BY 6 ❤️10. If temperature were increased at the same rate for all four substances, which substance
would turn into a gas first?
Answers
Answer:
Dependant
Explanation:
Depending on the kind of substance you have (since ur answer of what substances was vauge) you would want to look at the molecular structure of the substances.
Understanding intermolecular bonds are key here (research this)
For example, Bromine is found as Br2 and only exerts London dispersion forces as there is no difference in polarity. And because this force is weaker, it has a lower boiling point
Another example being something like Hydrochloric acid (HCl). This is where Hydrogen acts as the positive atom while chlorine is the negative atom. This creates a stronger force and thus, a higher boiling point than Br2
Finally, there is Something like H2O where the force in play is Hydrogen bonding as Nitrogen, Oxygen, Fluorine where the bonds are strongest due to the electronegativity is at the greatest difference between these and Hydrogen. and thus having a higher boiling point.
So depending on the substance's bond, that will help determine the boiling point. If they fall under the same group, go based on the greatest difference in electronegativity.
I don't know if this is what you're looking for but, hope this helps. :)
what volume of ammonia gas at 553 k553 k and 1.74 atm1.74 atm can be produced from the reaction of 1.46 kg1.46 kg of hydrogen gas and 1.46 kg1.46 kg of nitrogen gas?
Answers
The volume of ammonia gas is 2,720.95 liters.
Given
T = 553 Kp = 1.74 atmMass of hydrogen gas = m1 = 1.46 kg = 1,460 gramsMass of nitrogen gas = m2 = 1.46 kg = 1,460 gramsThe reaction to form ammonia gas
3H₂ (g) + N₂ (g) → 2NH₃ (g)
Calculate the molar mass
Molar mass of hydrogen gas = M₁ = 1 +1 = 2Molar mass of nitrogen gas = M₂ = 14+14 = 28Calculate the number of moles
Before reaction\(n_1 = \frac{m_1}{M_1} = \frac{1,460}{2}\)
n₁ = 730 mol
\(n_2 = \frac{m_2}{M_2} = \frac{1,460}{28}\)
n₂ = 52.14 molIn reaction
Not all hydrogen gas reacted but all nitrogen gas reacted.
Hydrogen gas that reacted
n₁' = 3 x n₂ = 3 x 52.14 = 156.42 mol
Ammonia gas that formed
n₃ = 2 x n₂ = 2 x 52.14 = 104.28 mol
According to the ideal gas equation
pV = nRT
The pressure of the ideal gas = p (atm or Pascal)The volume of the ideal gas = V = (liters or m³)The amount of moles = n (mol)The universal gas constant = R = 0.0821 L atm/mol K = 8.314 L/Joule mol KThe temperature = T (K)Calculate volume of ammonia gas
\(V = \frac{n_3 RT}{p}\)
\(V = \frac{104.28 \times 0.0821 \times 553}{1.74}\)
\(V = \frac{4,734.45}{1.74}\)
V = 2,720.95 L
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Please actually help me.
Thank you!
Answers
Answer:
I say 20 is ur best option
what does Le châteliers principle state?
Answers
Hope this helps!
a board measures 212 inches how many feet is this?
Answers
Answer: 17.7 feet, Its rounded up since the six repeats.
calculates the equivalent mass of calcium chlorate CA (CI03) 2
Answers
Answer:
207g
Explanation:
Given compound:
Ca(ClO₃)₂
The equivalent mass can be derived by summing the molar masses of each atom
Molar mass of Ca = 40
Cl = 35.5
O = 16
Now solve;
Molar mass = 40 + 2(35.5 + 3(16)) = 207g
An unknown compound has a density in the gas phase of 1.14 g/L at 125 0C and 175 Torr pressure. What is the molar mass of this compound
Answers
To find the molar mass of the unknown compound, we can use the ideal gas law: PV = nRT, therefore, the molar mass of the unknown compound is 50.4 g/mol.
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to convert the density to moles per liter. We can use the formula: density = molar mass * (pressure)/(R*temperature)
Rearranging the formula to solve for molar mass: molar mass = density * (R*temperature)/pressure
Plugging in the given values:
density = 1.14 g/L
pressure = 175 Torr = 0.23 atm (since 1 Torr = 1/760 atm)
temperature = 125°C = 398 K
R = 0.08206 L atm/(mol K)
molar mass = 1.14 g/L * (0.08206 L atm/(mol K) * 398 K)/0.23 atm
molar mass = 50.4 g/mol
Therefore, the molar mass of the unknown compound is 50.4 g/mol.
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1) Which New York State landscape region is located at 42 N, 75 W?
A) Erie-Ontario Lowlands
B) Hudson-Mohawk Lowlands
C) the Catskills
D) Tug Hill Plateau
Answers
Answer:C) the Catskills
Explanation: