How many unpaired electrons are present in a ground-state atom from each of the following groups?
(b) 7A(17)
Answers
For 7A(17) :
Electronic configuration \(ns^2 np^5\)
So, there are 5 unpaired electrons present in group 7A(17).
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
What is the equation to determine the MA of a wedge?
MA= length - width
MA= Length+ width
MA= Length * width
MA= Length/ wisth
Answers
Answer:
length/width
Explanation:
Answer:
Length/Width
Explanation:
I did the module 10 exam so I know it is length/width
What does weight measure?
Answers
Answer: Weight is the measure of the force of gravity
Explanation:
Weight is a measure of the force of gravity on a physical object and is measured in newtons. The weight of a bird of mass 15 g varies with the magnitude of the gravitational force acting on it and would be considerably different if measured on the Moon, for example, instead of on Earth.
help me pleaseeee, ty if you doo:))
Answers
Answer:
9 is the correct answer
Which is a difference between plant and animal cells?
Question 7 options:
An animal cell can produce energy, because it has mitochondria.
A plant cell has a well defined shape, because it has a cell wall.
A plant cell can store genetic information, because it has a nucleus.
Molecules can only pass into an animal cell because it has a cell membrane.
Answers
Answer:A plant cell has a well defined shape, because it has a cell wall.
Explanation:
Which of the following is an example of a mixture?
A. CO2 + H2 + O2
B. NaCl
C. C6H12O6
D. Ca
Answers
Explanation:
hey my name is barsha CO2 + H2 + 02
which one of these elements is a liquid at room temperature.
B
Sr
Hg
Sb
Answers
Please help! I need the answers! you’ll get 25 points!!
Answers
Answer:
183918551670's1665....
glucose can be classified as an aldohexose. name the following monosaccharide to indicate its carbonyl group and the number of carbon atoms.
Answers
Glucose can be classified as an aldohexose Ketopentose.
Glucose is an easy sugar with the molecular method C₆H₁₂O₆. Glucose is universally the maximum plentiful monosaccharide, a subcategory of carbohydrates.
Hyperglycemia approach there's an excessive amount of sugar within the blood because the frame lacks sufficient insulin. associated with diabetes, hyperglycemia can purpose vomiting, immoderate starvation and thirst, speedy heartbeat, imaginative and prescient issues, and other signs and symptoms. Untreated hyperglycemia can result in severe fitness problems.
Ingredients evidently excessive in pure glucose include honey, agave, molasses, dried fruit, fruits, fruit juices, and candy corn. these foods are healthful, in moderation, as a part of a balanced food plan, especially clean fruits. foods that typically have quite a little brought glucose consist of sauces, salad dressings, pies, and sugary drinks.
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What is crisscross method for lead (ii) sulphide (need picture)
Answers
The crisscross method is a technique used to determine the chemical formula of a compound, including lead (II) sulphide.
How is this so?In this method, the charges of the ions involved are crossed over and used as subscripts for the opposite ion.
For lead (II) sulphide,the lead (II) ion has a charge of +2, and the sulphide ion has a charge of -2.
When crisscrossing the charges, the formula forlead (II) sulphide becomes PbS.
The crisscross method is important because it allows us to accurately determine the chemical formula of a compound, providing essential information about the composition and ratio of elements present.
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A solution was found to have a 15. 6 % transmittance at 500 nm, its wavelength of maximum absorption, using a cell with a path length of 5. 00 cm. Calculate the absorbance of the solution in a 1. 00 cm cell at 500 nm.
Answers
The correct answer is 0.161.
Solution:
Percentage transmission (%T) of the sample = 15.6
Therefore, Absorbance (A) 2 – log (%T) = 2 – log (15.6) = 0.8069
Use Beer’s law:
A = ε*c*l where ε = molar absorptivity of the solution, c = concentration of the solution, and l = path length of the solution.
Given A = 0.8069 and l = 5.00 cm, we must have
0.8069 = ε*c*(5.00 cm)
ε*c = 0.16138 cm-1
For the next part, assume that ε*c remains constant and we have
A’ = ε*c*l’ where l = 1.00 cm.
Plug in values and write
A’ = (0.16138 cm-1)*(1.00 cm) = 0.16138
Absorption measures the amount of light of a particular wavelength that a particular substance blocks from passing. The two main factors that affect absorption are substance concentration and optical path length. The net Absorption Rate is calculated using the formula of the total vacant area at the beginning of the period plus square feet.
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40 units of regular Humulin insulin in 100 mL 0.9% NS were to infuse at 10 mL/hr. How many units per hour will be delivered
Answers
When infusing 40 units of regular Humulin insulin in 100 mL of 0.9% NS at a rate of 10 mL/hr, 4 units of insulin will be delivered per hour.
To determine the number of units per hour that will be delivered when infusing 40 units of regular Humulin insulin in 100 mL of 0.9% NS (normal saline) at a rate of 10 mL/hr, we can set up a proportion.
Given that 40 units of insulin are diluted in 100 mL of solution, we can calculate the concentration of insulin in units per milliliter (units/mL) as:
Concentration of insulin = 40 units / 100 mL = 0.4 units/mL
Next, we need to determine the number of units delivered per hour. Since the infusion rate is 10 mL/hr, we can multiply the concentration of insulin by the infusion rate to find the units delivered per hour:
Units per hour = Concentration of insulin * Infusion rate
= 0.4 units/mL * 10 mL/hr
= 4 units/hr
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The substance oxidized causes the other substance to be reduced and is called the:.
Answers
Answer:
Reducingagent
Explanation:
Hope this helps you :)
Pls mark brainliest :P
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Tori
Which of the following is characteristic of non-metals?
A)
They're always solids at room temperature.
B)
They're strong conductors of electricity.
C)
They tend to be denser than metals.
D)
They tend to gain electrons in chemical reactions.
Answers
Answer:
B
Explanation:
Non metals do not conduct electricity
Answer:
D.
Explanation:
I saw it in the textbook
what is δg∘ for the half-reaction below? clo3–(aq) + 6h+(aq) → 0.5cl2(g) + 3h2o(ℓ) e° = +1.47
Answers
The ΔG° for a half-reaction can be calculated using the equation ΔG° = -nFE°, where n is the number of electrons transferred and F is the Faraday constant. In this case, the half-reaction involves the transfer of 6 electrons, so n = 6. The value of E° is given as +1.47 V. The Faraday constant is 96,485 C/mol.
Plugging these values into the equation, we get:
ΔG° = -6 x 96,485 C/mol x 1.47 V
ΔG° = -862,871 J/mol
Converting this value to kilojoules and rounding to 3 significant figures, we get:
ΔG° = -863 kJ/mol
Therefore, the ΔG° for the given half-reaction is -863 kJ/mol. This negative value indicates that the reaction is spontaneous and can proceed in the forward direction under standard conditions.
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NEED THIS NEED TO GET OFF ITS MY BRO BDAY NEED IT FOR A BIG GRADE NEed it SO BAD
Answers
Answer:
he is right, top right
Explanation:
1. The standard reduction potential for the Cu2+/Cu redox couple is +0.34 V; that for H20/H2, OH- at a pH of 7 is -0.41 V. For the electrolysis of a neutral 1.0 M CuSO4 solution, write the equation for the half-reaction occurring at the cathode at standard conditions. 2. In an electrolytic cell, a. reduction occurs at the (name of electrode) b. the anode is the (sign) electrode c. anions flow toward the (name of electrode) d. electrons flow from the (name of electrode) to (name of electrode) e. the cathode should be connected to the (positive/negative) terminal of the dc power supply
Answers
Therefore, the answers are:
a. Reduction occurs at the cathode.
b. The anode is the positive electrode.
c. Anions flow toward the anode.
d. Electrons flow from the anode to the cathode.
e. The cathode should be connected to the negative terminal of the DC power supply.
The half-reaction occurring at the cathode during the electrolysis of a neutral 1.0 M CuSO₄ solution at standard conditions can be determined by considering the reduction potentials.
The reduction potential for the Cu²⁺/Cu redox couple is +0.34 V, indicating that Cu²⁺ can be reduced to Cu. On the other hand, the reduction potential for the H₂O/H₂, OH⁻ redox couple at pH 7 is -0.41 V, indicating that H⁺ ions can be reduced to H₂.
Comparing the reduction potentials, we can see that H⁺ ions have a more negative reduction potential than Cu²⁺ ions. Therefore, at the cathode, H⁺ ions will be reduced to H₂.
The equation for the half-reaction occurring at the cathode during the electrolysis of a neutral 1.0 M CuSO₄ solution at standard conditions is:
2H⁺ (aq) + 2e⁻ -> H₂ (g)
Now, let's address the statements regarding electrolytic cells:
a. Reduction occurs at the cathode.
b. The anode is the positive electrode.
c. Anions flow toward the anode.
d. Electrons flow from the anode to the cathode.
e. The cathode should be connected to the negative terminal of the DC power supply.
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True or False? when combining a strong acid with water to dilute it, you should add the acid to the water.
Answers
When diluting a strong acid with water, it is recommended to add the acid to the water and not the other way around. The statement is true.
This is because adding water to the acid can cause a rapid and exothermic reaction, leading to splattering and potential injury.
When the acid is added to the water, the heat generated is absorbed by the water, reducing the potential for splattering. Additionally, adding the acid to water allows for better mixing and reduces the risk of creating concentrated acid pockets that can be dangerous.
Overall, it is important to follow safe laboratory practices when working with acids and to consult with a trained professional if you are unsure about the proper procedures.
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which type of bond is found in many carbon-to-carbon bonds in canola oil?
Answers
Answer:
Double bonds
Explanation:
Which rule or principle does this violate?
A. Aufbau Principle
B. Pauli Exclusion Principle
C. Hunds rule
Answers
Answer:
Hunds rule is violated here.
Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.
Identify the following as an example of a physical or chemical. Olive oil, vinegar, salt, and pepper are shaken together together to make salad dressing
Answers
Answer:
Chemical Change
Explanation:
Mixing these elements together creates a chemical change
Making of a salad dressing is a physical change as there is no change in the chemical composition.
What is a physical change?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
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Gold has an FCC structure and a lattice constant of 0.40788 nm. Calculate the atomic radius in nanometers
Answers
the atomic radius is 0.144 nm.
Given:
FCC structure. Lattice constant = a = 0.40788 nm.
Atomic radius = r.
According to the definition of the FCC structure, there are 4 atoms per unit cell.
So, the length of the face diagonal can be found as follows:
a√2 = 0.40788 nm√2a = 0.40788 nm/√2a = 0.288 nm
From this, the radius can be calculated:
r = a/2r = 0.288 nm/2r = 0.144 nm
Therefore, the atomic radius is 0.144 nm.
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How many grams of LiF are needed to make 87 g LiF solution into a
34.5% solution?
solution?
answer options:
30 g LIF
0.01 g LIF
45.8 g LIF
0.02 g LIF
Answers
Answer: 30 g LiF
Explanation:
Which of these choices describes a segment of
DNA that determines a specific trait in a person,
such as attached earlobes?
A. a gene
B. a phenotype
C. a chromosome
D. a characteristic
Please help ..
Answers
Given the balanced equation:
2 Al + 6 NaOH --------> 2 Na3AlO3 + 3 H2
What mass, in grams, of Na3AlO3 is produced when 6 x 10^23 molecules of NaOH is consumed?
explain
a) 240 b) 80 c) 64 d) 9.6 e) 48
Answers
47.78 grams of Na₃ AlO₃ is produced when 6 × 10²³ molecules of NaOH are consumed.
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and the total charge for each component of the reaction.
The balanced equation:
2 Al + 6 NaOH --------> 2 Na₃ AlO₃ + 3 H₂
We have 6 × 10²³ molecules of NaOH.
So, the mass of Na₃ AlO₃ will be:
= 6 × 10²³ molecules NaOH × ( 1 mol NaOH / 6.023 × 10²³ molecules NaOH ) × ( 2 mol Na₃ AlO₃ / 6 mol NaOH) × ( 143.9 g Na₃AlO₃ / 1 mol Na₃ AlO₃ )
= 47.78 g Na₃ AlO₃
The mass of Na₃ AlO₃ produced when 6 × 10²³ molecules of NaOH are consumed is 47.78 grams.
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Give one example of an element and one compound.
Can someone help me with this pls
Answers
Element: Helium, Oxygen
Compound: H2O, CO2
Is this statement true or false?
A compound is a substance made of two or more elements joined in a chemical reaction.
true
false
Answers
The correct answer is False.
number the steps for balancing equations:
Use coefficients to increase the atoms on each side.
Check to make sure you have the same number of each type of atom on each side.
Count the atoms on each side.
ldentify the atoms on each side.
Answers
Answer:
identify the atoms on each side.
Count the atoms on each side.
Use coefficients to increase the atoms on each side.
Check to make sure you have the same number of each type of atom on each side.
Explanation:
The concept behind balancing chemical equations is to ensure that they comply with the law of conservation of matter. This helps to make chemical equations quantitatively meaningful.
First, identify the atoms on each side of the expression. Then count these atoms. Assign appropriate numeric coefficient to the species. Then check to make sure there are equal number of each type of atoms on each side.The subscript of the formula must not be changed in an attempt to balance a chemical equation.
Which of the following is an example of a substance changing its state of matter?
Crumpling paper
Ink added to water
Breaking a chair into pieces
Water collecting on a cold glass
Answers
Breaking a chair into pieces is an example of a substance changing its state of matter ,therefore option (c) is correct.
What do you mean by the states of matter ?There are three state of matter which includes solid, liquid and gases.
A solid is, in most cases, rigid and holds a definite shape. Solids do not change shape at room temperature. They retain the same shape.
A liquid typically flows and, when inside a contained, takes its shape, although the upper surface remains flat or slightly curved.
Gases do not have any definite shape nor have any specific volume. Gases fill the entire space available to them. They can be compressed under pressure.
Breaking a chair into pieces is an example of a substance changing its state of matter ,hence option (c) is correct.
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Answer:
Its (D) Water collecting on a cold glass
Explanation:
Got it right on my quiz.
Condensation, in this case the water vapor turns into a liquid causing a change of its state of mater.
The atomic theory describes _____ because ____, ___ and ____
Atomic theory shows a ____, because ___,___,___
Answers
The atomic theory describes Dalton's theory because electron, proton and neutron.
The first a part of his theory states that every one matter is product of atoms, which might be indivisible. The second one part of the concept says all atoms of a given element are equal in mass and houses. The element says compounds are combos of two or extra distinctive forms of atoms.
One of the maximum essential merits of Dalton's atomic idea is the truth that the idea does no longer violate numerous fundamental laws of chemical combination consisting of the regulation of precise proportions, the regulation of multiple proportions, and the regulation of conservation of mass.
In 1803 Dalton located that oxygen mixed with both one or volumes of nitric oxide in closed vessels over water and this pioneering remark of fundamental more than one proportions supplied vital experimental proof for his incipient atomic thoughts.
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What mass of titanium chloride reacts with 460 g of sodium?
Answers
Answer:
771.15g of TiCl4
Explanation:
460 grams of sodium=20 mol
equation of the reaction is TiCl4+4NA=4NaCl+Ti
1 mol of titanium chlroide reacts with 4. that means there are 5 mols of titanium chloride
titanium chloride has a molar mass of 154.23 g.
mutiply that by 5 and we have 771.15 g
To react with 460 g of sodium, 949 g of titanium chloride are required.
Let's consider the following balanced equation.
TiCl₄ + 4 Na ⇒ Ti + 4 NaCl
We can calculate the mass of titanium chloride that reacts with 460 g of sodium considering the following relationships.
The molar mass of Na is 22.98 g/mol.The molar ratio of TiCl₄ to Na is 1:4.The molar mass of TiCl₄ is 189.68 g/mol.\(460 g Na \times \frac{1molNa}{22.98gNa} \times \frac{1molTiCl_4}{4molNa} \times \frac{189.68gTiCl_4}{1molTiCl_4} = 949gTiCl_4\)
To react with 460 g of sodium, 949 g of titanium chloride are required.
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