The most reasonable first step to take would be to, In a highly heterogeneous class, a teacher should give everyone the same assignment because it will help him/her be able to track student progress efficiently.
What is heterogeneous?
A predication that means composed of different ingredients or dissimilar factors is called heterogeneous.
What is Reasonable?
A generic and relative one and applies to that which is suitable for a particular condition is called reasonable.
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A lab assistant wants to prepare 0.2 mol dm-³ of potassium chloride solution. What is the volume of distilled water needed to dissolve 2.98 g of potassium chloride? [Molar mass of potassium chloride = 74.5 g mol-¹]
Answer:
Explanation:
Molarity given = 0.2 mol dm ^ -3
wieght of potassium chloride = 2.98g
molar mass of potassium cloride = 74.5
let us assume vol. of water needed= x
molarity = weight * 1000 / molar mass * volume
0.2 = 2.98 * 1000 / 74.5 * x
0.2 = 2980 / 74.5x
74.5x = 2980 / 0.2
74.5 x = 14900
x = 200
hence, volume required is 200 ml
a sample of nitrogen gas collected at stp occupies a volume of 45.1 l. how many moles of gas does the sample contain?
The number of moles that the sample which occupies a volume of 45.1 L at STP contains is 1.2 moles.
At STP,
P = 1atm
T = 273 K
Given,
V = 45.1 L
R = 0.0831 kJ/mol K
By ideal gas law,
PV = nRT
Substituting the values and solve the equation to obtain the value of n,
45.1 × 1 = n × 0.0831 × 273
⇒ n = 45.1/22.6863
⇒ n = 1.2 moles
Hence, the number of moles of the gas is 1.2 moles.
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a solid has a mp of 133-137 oc. what can one conclude about the sample? the sample is one of four possible compounds the
A solid sample has a MP of 133 - 137°C. one can conclude about the sample is It is relatively impure.
the temperature at which a compound completely melts is called as melting point but generally we don't observe a melting point rather a range is observed if range more than 20 C is observed generally it's said that it's impure an impure solid melts over a wide range and at a temperature lower than that of the pure solid. so since the last value 139 0 C must be the reported value when you must have seen it completely melting so it's melting point should be this only .
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calculate the volume of solution in liters, l, needed to prepare a 0.650 m solution from 180.0 g of magnesium chloride, mgcl2. the molar mass of mgcl2 is 95.21 g/mol.
800 ml of water should be used to dissolve 203.3 g of MgCl2 • 6H2O. Using water, adjust the volume to 1 liter. Create aliquots and autoclave to sterilize. It should be noted that MgCl2 is highly hygroscopic.
Therefore, the given mass is equal to the number of moles divided by the given mass will be equal to the number of moles multiplied by molar mass, so the number of moles was 250 multiplied by 10 to the power minus 6 multiplied by molar mass, which is given in the question, so mass required, will be 0.0149 gram.
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A wave has a frequency of 53Hz and a wavelength
of 4 meters. What is it's wasvespeed?
Answer:
[tex] \huge{\boxed{212 \: \text{m/s}}} [/tex]
Explanation:
The speed of the wave given it's frequency and wavelength can be found by using the formula;
[tex] \bold{v = f \times \lambda}[/tex]
where f is the frequency in Hz and [tex] \lambda [/tex] is the wavelength in m
From the question
f = 53 Hz
[tex] \lambda [/tex] = 4 m
[tex] \large{v = 53 \times 4 = 212}[/tex]
We have the final answer as
212 m/sIf 60 g of a radioactive substance naturally decays to 15 g after 16 hours, what is the half-life of the radioisotope?.
If 60 g of a radioactive source voluntarily declines to 15 g within 16 hours, the radioisotope's half-life is 8 hours.
What are radioisotopes and how are they measured for radioactivity?The quantity of protons with in atomic nuclei of component atoms of the same chemical is the same, but the neutron count varies. The radioactive materials of an element are called radioisotopes. They can alternatively be described as atoms with excess electricity in their nucleus or unstable neutron-proton combinations. Actual radiation levels are reported using the Contributes to the ongoing (Bq), the global unit, or the Cobalt (Ci), official machine in the U. S.. Alternative photodiode varieties may be used instead of gamma counters, which are widely used to measure environmental parameters.
Briefing:Half life = total life/2
Half life = 16/2
Half life = 8 hours
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Which of the following messages is most likely to lead to a power struggle rather than to effective communication?Lecturing and criticizingOrdering and threateningMoralizing and ridiculingAnalyzing and withdrawing
Moralizing and ridiculing are both behaviors that can lead to a power struggle rather than effective communication.
The moralizingWhen someone moralizes, they are trying to dictate the morality of a situation and put their own values above others. This can lead to feelings of superiority and can make the other person feel like they are being judged or judged unfairly.
Similarly, when someone ridicules someone else, they are attempting to make the other person feel inferior and belittled. This can make the other person feel attacked and can lead to a power struggle as they attempt to regain their sense of power and control.
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solid calcium carbonate is obtained by the reaction of solid calcium oxide and carbon dioxide gas .write a balanced chemical equation for this reaction.
The balanced equation in a reaction involving the Combination reaction of solid calcium oxide and carbon dioxide gas into solid calcium carbonate would be:
[tex]CaO(s)+Co_{2}(g) -- > CaCo_{3}(s)[/tex]
Equation of reactions contains ;
-Solid calcium carbonate goes by the chemical formula : CaCO3 (s)
-Solid calcium oxide goes by the chemical formula: CaO (s)
-Carbon dioxide gas goes by the formula: CO2 (g)
Putting everything together in a single reaction and balancing out the number of atoms on each side of the equation will give;
[tex]CaO(s)+Co_{2}(g) -- > CaCo_{3}(s)[/tex]
What is combination reaction ?
A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is: A+B→AB. One combination reaction is two elements combining to form a compound.
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aqueous solutions of the following reactants are mixed. after the reaction goes to completion, calculate the concentration (in mol/l) of silver ions in solution. 167.7 ml of 3.50 m agno3 are mixed with 150.0 ml of 1.50 m cacl2 do not include units in your answer. if you round during your calculation, be sure to keep at least three (3) decimal places. report your answer to two (2) decimal places.
Concentration of sliver ions in the solution= 175.3ml*1L/10³*3.50/1L
Concentration of sliver ions in the solution= 0.6135
1) Percent concentration: This is the quantity of solute that dissolves in 100 g of solvent. If a solution's concentration is 20%, we know that there are 20 g of solute in every 100 g of solution. As an illustration, a solution is made by mixing 10 g of salt and 70 g of water. by % mass, determine the solution's concentration.
The Latin argentum and Sanskrit argunas, both meaning "bright," are where the word "Ag" originates. Even in the Stone Age, silver was used. Silver use dates back at least 5000 years, according to archeological findings.
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balance the reaction equation describing the biological formation of glucose (c6h12o6) with the lowest set of whole number coefficients. what is the coefficient (d) of o2(g)? a co2(g) b h2o(l) → c c6h12o6 (aq) d o2(g)
The given reaction equation for photosynthesis whereby, in the presence of light energy from the Sun and chlorophyll, plants synthesize glucose from carbon dioxide and water. As water is present as a reactant, it doesn’t also appear on the ’products’ side of the equation. So:
Water + carbon dioxide > glucose + oxygen.
As glucose contains 6 carbon atoms, these must be obtained from 6 molecules of CO2. So, overall:
6CO2(g) + 6H2O(l) > C6H12O6(aq) + 6O2(g).
What is photosynthesis?
Photosynthesis is the process plants and other organisms use to convert light energy into chemical energy, which is later released through cellular respiration to power the activity of the organism.
Therefore, This is the equation for photosynthesis whereby, in the presence of light energy from the Sun and chlorophyll, plants synthesize glucose from carbon dioxide and water.
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which cyber protection condition establishes?
Cyber protection condition establishes CPCON 2 (High: Critical and Essential Functions)
CPCON 1 (Very High: Critical Functions)
CPCON 3 (Medium: Critical, Essenti.al, and Supp0rt Functions)
CPCON 4 (Low: All Functions)
CPCON 5 (Very Low: All Functions)
Protecting your systems, apps, and networks from cyberattacks is known as cybersecurity. The following are only a few examples of cybersecurity types:
Using methods like remote access management and two-factor authentication, network security protects internal networks from illegal access (2FA)
Application security guards against theft and unauthorized use of data and code in mission-critical software, both in use and in development. Examples of this include penetration testing and encryption.
User education: educating staff members and clients on the best practices to follow when avoiding cyberattacks such malware and phishing scams
The difference between cybersecurity and cyber protection is how they handle data. Data protection is not the main emphasis of cybersecurity; rather, it is the protection of the systems that enable data access, storage, transmission, and authentication. Bypassed or rendered inoperable by unidentified threats,
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green plants use light from the sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose and oxygen gas. calculate the moles of carbon dioxide needed to produce 0.075 mol of glucose. be sure your answer has a unit symbol, if necessary, and round it to significant digits.
0.45 moles of carbon dioxide are needed to produce 0.075 mol of glucose.
6CO2 + 6H2O ===> C6H12O6 + 6O2 ... balanced equation
0.075mol glucose x 6 mol CO2/1 mol glucose = 0.45 moles CO2 needed (2 large figures).
At some stage in photosynthesis, vegetation absorb carbon dioxide (CO2) and water(H2O) from the air and soil. In the plant cellular, the water is oxidized, which means it loses electrons, even as the carbon dioxide is decreased, which means it gains electrons.
Photosynthesis converts radiant or suns electricity into chemical energy. The productivity of agricultural crops without delay depends upon the rate of photosynthesis. It presents oxygen in the environment for all living organisms.
Photosynthesis is a natural system by using which trees and flowers use energy from the sun and carbon dioxide from the air to make the food they want to live and develop.
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n each reaction box, place the best reagent and conditions from the list.
You are currently in a labeling module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Answer Bank
NH3NaBH4, CH3CH2OH
PBr3, pyridine
NaNH2Br2, FeBr3CH3NH2H2SO4Mg, Et2OZn(Hg), HClCH3CNCH3MgBrNaCN
H2, Pt
In each reaction box, place the best reagent and conditions from the list.
You are currently in a labeling module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Answer Bank
CH3CNCH3NH2NaBH4, CH3CH2OH
PBr3, pyridine
CH3MgBrNaNH2Mg, Et2OH2SO4H2, PtNH3NaCNZn(Hg), HCl
Br2, FeBr3
Three stages are required to transform benzaldehyde into 2-phenyl acetonitrile.
A benzene ring with a formyl substituent makes up the chemical molecule known as benzoaldehyde. It is both the most readily used industrially and the most straightforward aromatic aldehyde. A benzene ring with a formyl substituent makes up the chemical molecule known as benzoaldehyde (C6H5CHO). It is both the most readily used industrially and the most straightforward aromatic aldehyde. It is a clear liquid with a distinct almond-like scent.
In addition to batteries, acetonitrile is used to create perfumes, rubber goods, insecticides, acrylic nail removers, and medications. Fatty acids are also extracted from both vegetable and animal oils using this method. Employees should receive safe handling and storage instructions prior to working with acetonitrile.
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A student conducts a titration to determine the molarity of a hydrochloric acid solution, HCl(aq), by reacting it with a standardized stock solution of sodium hydroxide, NaOH(aq). The student uses 10 ml of the unknown acid and titrates to the end point of the indicator. The student calculates the percent error of the molarity of the acid to be 35%. Which of the following could account for the large percent error? A) The reaction between sodium hydroxide and hydrochloric acid is a neutralization reaction B) The molarity of the sodium hydroxide is known while the molarity of the hydrochloric acid is unknown. The endpoint of the indicator may not have occurred at the equivalence point of the reaction D) The student used a 25 ml buret instead of a 50 ml buret I
The acetic acid in vinegar has a molar concentration of 0.530 M.
How much molar concentration is there?
When the chemical formula and molecular weight of the drug are known, the concentration can be calculated. Any substance's molar concentration in a solution can be simply calculated.
Molar concentration is the measurement of a solution's concentration as the No. of moles of a solute inside a liter of a solution.
The following equation can be used to compute the concentration or volume of the solutions:
M₁V₁ = M₂V₂
where M1, V1, M2, and V2 represent the volume and concentration of the concentrated & diluted solution, respectively.
Given a NaOH concentration, M1 = 0.1931 M (which should be necessary to apply the broth dilution),
and to calculate the molar concentration of acetic acid)
The volume of NaOH, V1, is 27.48 mL.
V2 = acetic acid volume in milliliters
In equation (1), substitute the values of V1, M1, and V2 as well as volume:
(0.1931) X (27.48) = (10) X (V₂)
V₂ = 0.530 M
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Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of radon-218 to decay from 99 grams to 0. 50 grams? the half-life of radon-218 is 35 milliseconds.
In 2.6*10² ms, a sample of radon-218 will deteriorate from 99 grams to 0.50 grams. The half-life of radon-218 is 35 milliseconds.
How crucial is nuclear power? What is a good nuclear example?The only significant, carbon-free energy resource that the nation can extensively expand to produce significant amounts of power is nuclear energy. When fossil fuels are burned to produce the same number of electricity, nuclear power plants avoid producing a sizable amount of emissions. One of the best instances of nuclear fusion seems to be the sun. Helium is created when hydrogen nuclei combine inside the sun, producing thermal energy which warms the Earth..
Briefing:t = 2.303/R log A₀/A
Hence, R = 0.693/t/2
t = 2.303/0.693*35 log 99/0.5
t = 267ms
= 2.6*10² ms
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Which of these statements best describes the cause of this expansion?
A. Conductuion of heat from the mantle is expanding the crustal plates that hold the Alantic ocean
B. Convection within the mantle is bringing magma up to the crust in the middlw of the Atlantic Ocean,building new sea floor
C. As the crustal plates that hold the mainland of North America and Europe get older, they sink, causing the Atlanic Ocean to spread
D. At the mid-Atlantic Ridge, the crustal plates hold North America and Eurioe are colliding together, causing volcanic activivty and earthquakes
*I HAVE 6 DAYS UNTIL THIS IS DUE*
Answer:
B. Convection within the mantle is bringing magma up to the crust in the middlw of the Atlantic Ocean,building new sea floor. Do you have mrs cogliati?
Explanation:
i have it 4 mrs.cogliati
What are two changes of state that are endothermic?
Answer:
fusion, vaporization, sublimation
a 47.2-ml sample of naoh is titrated with 0.624 m hbr. 27.4 ml of the acid are required to reach the equivalence point. what is the molarity of the base?
The molarity of the base would be 0.36 M.
What is Molarity?
The number of moles of dissolved solute per litre of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per millilitre of solution by dividing the number of moles and the volume by 1000. A precise 1.000 mole of KCl (74.55 g) must be dissolved in a quantity of water or another solvent to produce a precise 1.000 litre of solution in order to create a 1.000 M solution of KCl.
In actuality, this concentration unit is frequently abused. Since KCl is totally dissociated, the solution, for instance, with water as the solvent, is exactly 1.000 M in K+ and 1.000 M in Cl.
Recall that: mole = molarity x volume
Also; molarity = mole/volume
Mole of 0.624 M, 27.4 mL HBr = 0.624 x 27.4/1000
= 0.017 mol
If the mole of HBr is 0.017 mol, the equivalent mole of NaOH will also be 0.017 mol.
0.017 mol of 47.2 mL (0.0472 L) NaOH would molarity of:
0.017/0.0472 = 0.36 M
In other words, the molarity of the NaOH is 0.36 M.
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what is the molecular geometry of a molecule with 2 outer atoms and 1 lone pair on the central atom?
This molecule has been bent. The shape of angular molecules, also known as bent or V-shaped molecules, is non-linear.
Take water (H2O), for instance, which has an angle of roughly 105°.
Two double bond units and one lone pair make up the structure, which will take the form of a trigonal planar arrangement. SO2 is referred to be bent or V-shaped because the lone pair is ignored when describing the shape.
Therefore, if two electron pairs are paired but are not utilised in chemical bonding, they are referred to as lone pairs. As a result, the amount of valence electrons surrounding an atom is equal to the sum of the electrons in lone pairs and those in bonds.
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Explain how water can wear down the earth's surface at scales that are large and small in size or short and long in duration.
Water can wear down the earth's surface at scales that are large and small in size or short and long in duration by carrying away bits of soil and sand and slowly wash away the sediment.
What is Weathering?Weathering is referred to as the breaking or wearing down of rocks as a result of certain factors such as rain, glacier etc. They also form cracks in the rocks after which disintegration sets in after a while.
Water as an important factor has the ability to wear down the earth's surface at scales that are large and small in size or short and long in duration which is known as erosion. It involves carrying away bits of soil and sand and slowly washing away the sediment which are therefore the ways in which it occurs and is the correct choice.
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A car engine fueled by gasoline uses which kind of energy?
OA. Electric
OB. Nuclear
O C. Potential
OD. Chemical
Answer:
A.electric
Explanation:
electric is very useful in ingines
Answer: A.
Explanation:
when aqueous solutions of magnesium nitrate and sodium carbonate are mixed together what will happen
When sodium carbonate and magnesium nitrate solutions are combined, a precipitate is created as a result of a double-displacement process. As you balance the chemical equation, make predictions about the reaction's byproducts.
What occurs when magnesium sulfate and sodium carbonate are combined?A solid may form when the solutions of two soluble salts are combined. Salts that are insoluble are created during precipitation processes. When magnesium sulfate and sodium carbonate are combined, magnesium carbonate, an insoluble salt, results.
What happens when hydrochloric acid and sodium carbonate interact?What takes place when sodium carbonate and hydrochloric acid interact? When sodium carbonate is added to hydrochloric acid, a double displacement reaction takes place, resulting in the formation of sodium chloride, water, and carbon dioxide. The sodium carbonate and the two moles of HCl combine to generate carbonic acid.
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If 60 g of a radioactive substance naturally decays to 15 g after 16 hours, what is the half-life of the radioisotope?.
The half-life of the radioisotope is 8 hours.
What do you mean by half-life?
Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive.
How do you calculate half-life decay?
The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T1/2, and the decay constant is given by T1/2 = 0.693/λ.
The half-life of the radioisotope is 8 hours.
Half life=total life/2
Half life=16/2
Half life=8 hours
Thus, the half-life of the given radioisotope is 8 hours.
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HELP PLEASE!! BRAINLIEST TO BEST ANSWER!
2. Here is a chemical equation:
CH4 + O2 → CO2 + H2O
• Balance this chemical equation.
• State what type of chemical reaction this is.
• What will accompany the products as a result of this
reaction?
• Discuss how your balanced chemical equation agrees
with the law of conservation of mass.
Answer:
HERE:
Explanation:
The balance equation is what it is already: CH₄ + 2O₂ → CO₂ + 2H₂O
The type of chemical reaction is combustion reaction.
Light and energy will accompany the product as a result of this reaction.
The law of conservation of mass makes sure the masses of the
molecules are same on both sides of the equation. Therefore, the mass of each element on both sides must be equal.
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what is the relationship between the products formed from (z)-3-methylhex-3-ene and those formed from (e)-3-methylhex-3-ene?
The products formed from (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene in hydroboration oxidation are the same; the only difference is that the stereochemistry of the products will be different.
The (z)-3-methylhex-3-ene will produce a product with the hydrogens on opposite sides, while the (e)-3-methylhex-3-ene will produce a product with the hydrogens on the same side. They are diastereomers.
The hydroboration oxidation reaction involves the addition of a borane (BH₃) and an oxidant (usually H₂O₂) to an alkene. The borane adds to the alkene double bond to create a new carbon-boron bond, and the oxidant adds oxygen to the boron, forming a boroxine and releasing a proton.
The product of this reaction is alcohol. Since both (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene are the same alkene, the reaction mechanism and products are the same; the only difference is the stereochemistry.
The (z)-3-methylhex-3-ene will produce a product with the hydrogens on opposite sides, while the (e)-3-methylhex-3-ene will produce a product with the hydrogens on the same side.
In summary, the products formed from (z)-3-methylhex-3-ene and (e)-3-methylhex-3-ene in hydroboration oxidation are the same, but the stereochemistry of the products is different.
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the absorbance of a 2.50 x 10-3 m solution in a 5.00 cm pathlength cell is 0.589 at a wavelength of 450 nm. what is the molar absorptivity of the solution in units of m-1cm-1?
The molar absorptivity of the solution is 47.12 M⁻¹ cm⁻¹.
According to Beer-lamberts law absorbance (A) is directly proportional to path length (l) and concentration of the solution (C) .
It is given by the formula:
A = e x l x C ..........(1)
Where, e = molar absorptivity constant .
In the question we are given :
A = 0.589
C = 2.50 x 10⁻³ M
l = 5.00 cm
Putting these values in equation 1 we get:
0.589 = e x (2.50 x 10⁻³ M x 5 cm)
Or, e = (0.589 / (1.25 x 10⁻²) M⁻¹ cm⁻¹
Or, e = 47.12 M⁻¹ cm⁻¹ .
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if the equilibrium constant of a given reaction is 2.54, what is the equilibrium constant of its reverse reaction?
The reciprocal of the forward reaction's Keq,
Keq = 1/2.54
Keq = 0.394 for the reverse reaction, is the equilibrium constant for the reverse reaction.
The forward reaction rate constant divided by the reverse reaction rate constant gives the equilibrium constant.
What does K equating to 1 at equilibrium mean?
The concentration of the reactants is high at equilibrium if Keq is a small number (Keq1). In this instance, the reaction is in favour of reactants forming. Keq 1 indicates that there are considerable amounts of both reactants and products at equilibrium.
R's value is dependent on the units used, however it is typically expressed in S.I. units.
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what simple rule works quite often for predicting the number of bonds a nonmetal wants to form in order to satisfy the octet rule?
For the bond formation rule to be met, the octet rule, which calls for 8 electrons in the outermost shell, must be present.
What is octet rule?
According to the "octet rule," an atom is the most stable when it has a complete valence (outer) shell (typically 8 electrons, but hydrogen and helium only have two). As a result, the atoms involved in covalent (nonmetal to nonmetal) bonding often have eight valence electrons following the bond.
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As bond number increases (double bonds rather than single, triple rather than double etc. ), bond length and bond energy.
As bond number increases (double bonds rather than single, triple rather than double etc. ), bond length decreases and bond energy increases
Reason-Charges that are spaced apart are described by a dipole moment. There are two critical criteria that must be taken into account when assessing if a molecule has a dipole moment. It must first possess polar covalent bonds. The individual dipoles must not cancel out in the molecular structure, which is the second requirement. Because Br2 is not a polar molecule, it lacks a polar covalent bond.A bond number is a simple addition of two numbers that total the sum. Using number bonds, one can quickly determine the answer without performing any calculations. We can see from the example that when we see a number bond, we know the answer without having to calculate.
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a mixture of xe, kr, and ar has a total pressure of 6.69 atm. what is the mole fraction of kr if the partial pressures of xe and ar are 1.92 atm and 2.99 atm, respectively.
The mole fraction of the krypton is 0.27.
What is mole fraction?We know that in this case there is a mixture of gases and the gases that are mixed here are krypton gas and xenon gas. There are different number of moles of each of the gases that can be found in the mixture.
Now we have the idea that;
Total pressure of the gases = 6.69 atm
Partial pressure of Kr = ?
Partial pressure of Ar = 2.99 atm
Partial pressure of Xe = 1.92 atm
Partial pressure of Kr = 6.69 - (2.99 + 1.92)
= 1.78 atm
Partial pressure = Mole fraction * Total pressure
Mole fraction = Partial pressure/Total pressure
Mole fraction = 1.78 atm/6.69 atm
= 0.27
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