The given element has 18(Ar)+1+5=24 electrons i.e., the element is Cr. Thus the Cr atom has 6 unpaired electrons.
What is electronic configuration?In atomic physics and quantum chemistry, the electron configuration refers to how an atom's or molecule's electrons are arranged in their respective orbitals.
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
The electron configuration is used to describe an atom's ground state orbitals, but it may also be used to depict an atom that has ionised into a cation or anion by making up for any lost or gained electrons in the orbitals after it.
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The given element has 18(Ar)+1+5=24 electrons i.e., the element is Cr.
Thus the Cr atom has 6 unpaired electrons.
What's electronic configuration?
In atomic physics and quantum chemistry, the electron configuration refers to how an atom's or molecule's electrons are arranged in their respective orbitals.The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also referred to as electronic structure or electron configuration.
Why is electronic configuration?Commonly, the electron configuration is employed to describe the orbitals of an atom in its ground state, but it also can be used to represent an atom that has ionized into a cation or anion by compensating with the loss of or gain of electrons in their subsequent orbitals.
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H2PO4 -1 has a pKa of 6.86. If the concentration of H2PO4 -1 is 0.422 mM and the concentration of H1PO4 -2 is 0.068 mM what is the pH of the solution?
The pH of the solution is 6.07.
pKa = 6.86; the acid equilibrium constant
c(H₂PO₄⁻) = 0.422 mM; concentration of the acid
c(HPO₄²⁻) = 0.068 mM; concentration of the salt
Henderson–Hasselbalch equation for the buffer solution:
pH = pKa + log(c(HPO₄²⁻)/c(H₂PO₄⁻))
pH = 6.86+ log (0.068 mM/0.422 mM).
pH = 6.86 + log0.161.
pH = 6.86 - 0.79
pH = 6.07; potential of hydrogen
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.
When pH is less than seven (pH<7), solution is acidic..
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
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state what would be observed if each of the following reagents was added to the solution of aluminum chloride
i) lead (ii) nitrate solution
ii) ammonia solution drop wise until in excess
Answer:
See explanation
Explanation:
1) a precipitate of lead chloride would be observed if the concentrations of both reagents was high enough and the temperature was low enough
2) A gelatinous white-ish precipitate would be observed at first, though i'm not sure what would happen with excess ammonia. The precipitate would likely not dissolve in excess ammonia
Elements a and q form two compounds, aq and a2q3. the mass ratio (mass q)/(mass a) for aq is 0.574. what is the mass ratio (mass q)/(mass a) for a2q3?
The mass ratio (Mass of Q/ Mass of A) of the compound A₂Q₃ is 0.861.
mass ratio is a degree of the performance of a rocket. It describes how a lot greater big the car is with propellant than with out; this is, the ratio of the rocket's moist mass (vehicle plus contents plus propellant) to its dry mass (car plus contents). A extra green rocket layout calls for less propellant to gain a given intention, and would consequently have a lower mass ratio; but, for any given efficiency a better mass ratio usually permits the vehicle to obtain higher delta-v.Given,
The mass ratio (mass Q)/(mass A) for AQ is 0.574
We have to find the mass ratio (mass Q)/(mass A) of A₂Q₃.
The mass ratio for A₂Q₃ is
Mass of Q/ Mass of A = 3 × mass Q/ 2 × mass A
Or, Mass of Q/ Mass of A = (3/2) × (mass Q/ mass A)
Or, Mass of Q/ Mass of A = (3/2) × 0.574
Or, Mass of Q/ Mass of A = 0.861.
Therefore, the mass ratio for (Mass of Q/ Mass of A) for A₂Q₃ is 0.861.
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What was collected in the sample for chemical analysis? what was concluded from the results of this experiment?
Miller performed the chemical analysis experiment and collected samples of several organic compounds ( like formaldehyde and hydrogen cyanide) and other complex molecules like amino acid that were called as hydrocarbons.
Miller concluded from the experiment that the early stage in the origin of life could have been supported by the abiotic synthesis of organic compounds.
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A mixture of water (H2O) and ammonia (NH3):
Answer:
h20 + NH3
Explanation:
water plus ammonia gives or produces a weak qcid
Answer:
The answer is hydrogen bonding
Explanation:
An atom is composed of a central nucleus which is surrounded by which orbiting particles? multiple choice question.
Electron are the orbiting particles, by which an atom is surrounded by.
What is electron?Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
An atom's nucleus is made up of electrons, protons, and neutrons. The positive charge of a proton balances out the negative charge of an electron. An atom is in a neutral state if its protons and electrons are equal in number.
They have a mass that is considerably lower, exist outside of the nucleus, and display both wave- and particle-like properties. Since an electron is also a fundamental particle, it is unreinforced and unbroken.
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The protons located on the unlabeled carbon atom belong to which proton set?
The protons located on the unlabeled carbon atom belong to a proton set.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are the building blocks of matter that cannot be broken down into smaller pieces by chemical processes. Most atoms are made up of three particles: protons, neutrons, and electrons. The defining particle that identifies an atom is the number of protons it contains. A particle without protons is not an atom.
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The most common ions for silver, zinc, and scandium are ag , zn2 , and sc3 . which of these ions have the same number of electrons as a noble-gas element?
Sc3+ ion has the same number of electrons as a noble-gas element.
For example, scandium (Sc) is an element with atomic number 21.
Electron configuration of scandium atom: ₂₁Sc 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹.
Electron configuration of scandium ion 3+: 1s² 2s² 2p⁶ 3s² 3p⁶
Scandium ion Sc³⁺ has the same number of electrons as noble gas argon (Ar).
Silver (Ag) is an element with atomic number 47.
Electron configuration of silver metal: [Kr] 4d¹⁰ 5s¹
Electron configuration of silver ion 1+: [Kr] 4d¹⁰
It does not have same configuration as noble gas.
Zinc a chemical element (the group 12 of the periodic table) with symbol Zn and atomic number 30, which means it has 30 protons and 30 electrons, because atom has neutral charge.
Electronic configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s².
Electronic configuration of zinc ion Zn²⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰
It does not have same configuration as noble gas.
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When water is added to a compound in a chemical equation, a new compound can be formed via?
When water is added to a compound in a chemical equation, a new compound can be formed via hydrolysis.
What is hydrolysis?It refers to any chemical process when a water molecule breaks one or more chemical bonds. When water is the nucleophile, the phrase is used generically to refer to substitution, elimination, and solvation processes.
The cleavage of biomolecules known as biological hydrolysis occurs when a water molecule is consumed in order to cause the division of a bigger molecule into its component parts. Scarification is the process of hydrolyzing a carbohydrate into its individual sugar molecules, as occurs when sucrose is broken down into glucose and fructose.
A condensation reaction, in which two molecules combine to form a bigger one and expel a water molecule, can be reversed by a hydrolysis reaction. Thus, condensation builds up by removing water, but hydrolysis breaks down by adding water.
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Which one of the following pairs of elements would be most likely to share similar properties?
a) n and f
b) b and si
c) cl and br
d) br and kr
e) li and be
Elements that would share similar properties are c) Cl and Br.
Elements chlorine (Cl) and bromine (Br) are both halogen elements.
In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessine (Ts).
They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
Chemical properties of these elements are similar, because they have the same number of valence electrons.
a) Nitrogen(N) and fluorine (F) are not in the same group of Periodic table of elements, so they have different properties.
b) Boron (N) and Si (silicon) are not in the same group of Periodic table.
d) Bromine and Kr (krypton) are different, because krypton is a noble gas.
e) Lithium (Li) and beryllium (Be) are not in the same group of Periodic table.
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How many ions of Na+ and C1- will be present in 30g of NaCl?
Ans fast plis
3.08*10^23 ions of Na+ and Cl- will be present in 30g of NaCl.
Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.
Mathematically, it can be represented as -
1 mol (Na) + 1 mol (Cl)
= 23.0+ 35.5
= 58.5 g/mol
In 58.5 gram of NaCl, there is one mole of Na or 6.02*10^23 ions
In one gram of NaCl, there will be
=6.02*10^23/58.5 sodium ions
In 30 grams of NaCl, the number of sodium ions will be -
(6.02*10^23*30)/ 58.5
=3.08*10^23 ions
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Solid sodium is reacted with 45.0 mL of a 2.00 mol/L H2SO4(aq) and aqueous solutions of hydrochloric acid and sodium sulfate are formed. How many moles of sodium sulfate are produced?
Number of moles of sodium sulfate is 0.633 mol.
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per litre of a solution is known as molarity.A count of a very large number of particles is called the number of moles. The Avogadro number is equal to one mole of any material.Given,
volume of solution= 45mL
molarity of soultion = 2.00 mol/L
we have to find number of moles of sodium sulfate.
Molar mass of sodium sulfate = 142
Number of moles of Na2SO4 = (Molarity of Na2SO4 × volume of the solution) / molecular mass of Na2SO4.
No. of moles of H2SO4 = (2 × 45) / 142 = 0.633 mol
Therefore, number of moles of sodium sulfate in solution is 0.633
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The mass of an atom doesn't include the mass of the electrons because?
a) of their negative charges
b) electrons are so small they don't really add any weight
c) they are outside the nucleus
I'm sure but a or c I'm sure
The energy for the phosphorylation of adp by atp synthase is powered directly by:_____.
The energy for the phosphorylation of ADP by ATP synthase is powered directly by H+ concentration across the membrane holding ATP synthase.
Phosphorylation: A biochemical process involving the addition of phosphate to an organic compound. Examples include the addition of phosphate to glucose to produce glucose monophosphate and the addition of phosphate to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP).
Phosphorylation plays an important role in the regulation of many cellular processes including cell cycle, growth, apoptosis, and signaling pathways. Phosphorylation is the most common mechanism used to regulate protein function and transmit signals throughout the cell. Glucose phosphorylation maintains the downward gradient of glucose metabolism and extramitochondrial glucose flux via the pentose phosphate pathway. Induction of the pentose phosphate pathway and generation of NADPH may also help prevent cell death.
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What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
Answer:
High sodium concentration in the extracellular fluid and high potassium concentration in the cytoplasm
Explanation:
A 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide. how many grams of oxygen was taken up by the reaction? 10.73 g 4.258 g 8.80 g 7.360 g 6.257 g
If a 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide, the grams of oxygen taken up by the reaction was 7.360 g
The balanced equation of chemical reaction is :
C + O₂ → CO₂
Given data is-
Given mass of Carbon- 2.760 g
Amount of carbon dioxide produced- 10.120 g
The molecular mass of carbon dioxide = 44.0 g/mole
To calculate number of moles, equation used is,
Number of moles (n) = Given mass
Molar mass
n = 10.120 g
44.0 g/mole
= 0.23 moles
So, The number of moles of oxygen produced is,
number of moles of O₂ = number of moles of CO₂
n = 0.23 moles.
Now, the molecular mass of oxygen is,
M = (2 × 16.0)g/mole = 32.0 g/mole
Mass of product = number of moles × molecular mass
m = (0.23 × 32.0) g
m = 7.360 g
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explanation on redox reaction
The redox reaction must occur between an oxidizing agent and a reducing agent.
What is redox reaction?From your question, you want me to give you a general idea about redox reaction and that is what I will do. Firstly, a redox reaction is one in which one specie is oxidized and the other is reduced. The both processes have to occur simultaneously.
When we say that the both processes occur simultaneously, we mean that the electron that is lost in one process is gained in another process and all these must happen within the same system not apart from each other.
The oxidation number of one specie increases while the oxidation number of the other specie decreases. Hence, an redox reaction must occur between an oxidizing agent and a reducing agent.
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6. Hydrogen bonds are also known as
Answer:
hydrogen bonds are also known as electrostatic dipole interaction
Is it the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
Yes, it is the power of material evidence that wins.
Evidence used to support or refute a scientific theory or hypothesis is known as material evidence.Evidence is also used by scientists in various contexts, such as when they apply ideas to real-world issues.Whether a person accepts the data as proof depends on their presumptions or views regarding how observations relate to a theory.A creative hypothesis is developed by a scientist and may be refuted by testing it against evidence or established truths.Evidence can refute a hypothesis by demonstrating facts that are at odds with it. In contrast, the presence of evidence does not preclude the possibility of future, undiscovered evidence supporting the idea.Therefore, it is the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
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A hypothetical metal has the bcc crystal structure, a density of 7.24 g/cm3, and an atomic weight of 48.9 g/mol. the atomic radius of this metal is:_______
The atomic radius of this metal is 1.22 × 10⁻⁸ cm.
The atomic radius of a chemical element is a measure of the size of its atom.
d(metal) = 7.24 g/cm³; a density of a metal
M(metal) = 48.9 g/mol; an atomic weight of a metal
Na = 6.022×10²³; Avogadro's number
Z(metal) = 2; number of atom the BCC unit cell
a = ?; the side length of the BCC unit cell
a = ∛Z×M /d×Na
a = ∛(2×48.9 g/mol) ÷ (7.24 g/cm³×6.022×10²³)
a = 2.82 × 10⁻⁸ cm
r = a×√3 / 4; the atomic radius formula
r = 2.82 × 10⁻⁸ cm×√3 / 4
r = 1.22 × 10⁻⁸ cm
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Breaking a(n) _____ of an element into smaller particles will change its properties -- it would no longer be that element.
The answer would be an atom.
Atom : An atom is a tiny piece of a matter that unparalleled defines a chemical element.
An atom comprise of a mid nucleus that is neighbouring by one or more negatively charged electrons. The nucleus is positively charged and consist one or more relatively bulky particles known as protons and neutrons.
It is the littlest unit of an element.
Cannot be made or annul in a chemical reaction.
Atoms of various elements have various masses and chemical attributes.
Atoms merged in the ratio of compact whole numbers to form compounds.
Characteristics of an atom : atomic number, mass number and net charge.
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Resonance structures for a molecule are an indication of overall lower energy for the molecule. True or false?.
This statement is true.
When all of the features of a compound cannot be explained by a single structure, numerous structures of that compound are employed to explain all of the attributes of the given molecule.
This phenomenon is referred to as resonance, and all structures are referred to as resonant structures.
As a result, resonance structures are collections of Lewis structures that explain the delocalization of electrons in a polyatomic ion or molecule, and the larger the extent of electron delocalization, the lower the overall energy in the system. Thus, resonance is known to increase compound stability by lowering energy.
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Gold has a density of 0.01932 kg/cm3. what volume (in cm3) would be occupied by a 22.2 g sample of gold?
A 22.2 g sample of gold with a density of 0.01932 kg/cm3 will occupy a volume of 1.1491 cm3.
Density, denoted by ρ, of a substance is its mass per unit volume. It shows the ratio between a substance mass and the volume it occupies. To solve for density, the formula is given by
ρ = mass / volume
Given a substance density, we can compute for its mass or volume using the same formula and vice versa.
But before inputting the values, convert the mass from g to kg to match the unit of density. (1 kg = 1000g)
mass = 22.2 g = 22.2 / 1000 = 0.0222 kg
To compute for the volume a sample of gold occupies,
volume = mass / ρ
where mass = 22.2 g = 0.0222 kg
ρ = 0.01932 kg/cm3
volume = 0.0222 kg / 0.01932 kg/cm3
volume = 1.1491 cm3
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The energy recommendation that describes the proportions of calories that should come from carbohydrate, fat, and protein are the: ______.
a. ears
b. ais
c. amdrs
d. dris
Explanation:
what are you feeling now I am looking forward
Which of these is a chemical change?
OA lake freezes solid.
O A copper bar is rolled into a flat sheet.
O Gravel, sand, and water are mixed.
O Vinegar bubbles when baking soda is added.
Answer:
Vinegar and baking soda
Explanation:
The others are physical changes, not chemical changes. This is because they do not change chemical properties or undergo a reaction.
However, when vinegar and baking soda are added together, it is a chemical change, because there is not only a reaction, but a change in its properties. Hopefully this helps!
When the concentration of a substance differs from one area to another, this creates a concentration.
The difference in the concentration of a substance between two areas is called the concentration gradient. When a region has a higher particle concentration than another, this is known as a concentration gradient. A concentration gradient will cause particles in passive transport to diffuse down it from higher concentration to lower concentration until they are evenly spaced.
The gradual separation of a region of high density from a region of low density in a solution in terms of the concentration of a dissolved material. Understanding how ions and particles flow randomly in a solution or gas depends on the concentration gradient.
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Which element forms easily into thin sheets?
O carbon
O helium
O gold
O bromine
Which solution is more concentrated: a 100 mm solution of glucose (c6h12o6) or a 0.1 m solution of glucose?
Solute : The minor component in a solution mixed in the solvent. Example - Salt, Sugar, Carbon dioxide (CO2) , Acetic acid etc.
Solvent : The substances that are used to disslove solutes ( this may be in the form of solid, liquid and gases) is known as solvent. Example : Water, Milk, Air , Ethanol, Methanol etc.
Solution : A solution is a homongeneous composition of one or more solutes mixed in a solvent. Example : Salt Water, Sugar mixed in water, Alcohol in water etc.
Types of Solution : Hypotonic , Isotonic, Hypertonic.
According tov question,
100 mm solution of glucose is more concentrated than 0.1 m solution of glucose because when we try to find the molality of 100 mm solution it is 0.617 m hence 100 mm solution of glucose is greater.
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Microscale reactions involve reaction mixtures with volumes___. some benefits of microscale chemistry are:____.
Microscale reactions involve reaction mixtures with volumes of 5 ml or less than 5 ml.
The benefits of microscale chemistry are as :
reduction in time for the experiment.cost-efficient.fewer safety hazards .less waste generation.Microscale reactions, delay with extremely small amounts of reagents and solvents, which reflects in the name, the reactions mainly work with 300 mg of compounds and solvent with volumes of 5 ml or less than 5 ml.
The benefits of such kind of chemistry are such as the first there is the involvement of less time in conducting the procedure, it allows repetition if something fails, second beacuse of usage of less chemical, lesser use of glassware of it is cost efficient, next there is a reduction in safety hazards such as possible explosions, and it efficient as it leads to minimizing in the quantity of waste.
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Convert a speed of 5.70 km/s to units of meter per hour. show the unit analysis by dragging the conversion factors into the unit factor slots
The speed of 5.70 km/s converted into meters per hour would be 20520000 meters/hour.
What is a unit of measurement?
A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
As given the speed is 5.70 km/s
1 km = 1000 m
5.7 km = 5700 m
3600 s = 1 hour
1 s = 1/3600 hour
5.70 km/s = 5700 meters / 1/3600 hour
=20520000 meters/hour
Thus, the speed of 5.70 km/s converted into meters per hour would be 20520000 meters/hour.
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