Answer:
1.26 m
Explanation:
The molality equation looks like this:
Molality = moles solute / mass solvent (kg)
In this case, sulfuric acid is the solute and water is the solvent. To calculate the molality, you need to (1) convert grams solute to moles solute (via molar mass), then (2) convert grams solvent to kilograms solvent, and then (3) calculate the molality.
(Step 1)
Molar Mass (H₂SO₄): 2(1.008 g/mol) + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (H₂SO₄): 98.073 g/mol
24.4 grams H₂SO₄ 1 mole
----------------------------- x ------------------------ = 0.249 moles H₂SO₄
98.073 grams
(Step 2)
198 grams H₂O 1 kg
------------------------- x ---------------------- = 0.198 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass solvent
Molality = 0.249 moles H₂SO₄ / 0.198 kg H₂O
Molality = 1.26 m
What physical property is used to separate cyclohexanone from any unreacted cyclohexanol?
Answer:
I think it involves the use of extractive distillation but I'm not sure.
Still hope it helps:-)
The physical property is used to separate cyclohexanone from any unreacted cyclohexanol is distillation.
The process for separating cyclohexanone from cyclohexanol comprises the following steps
1. reacting a mixture of ketone and alcohol with an organometallic compound M(X)n to form compound HX, wherein M is chosen from aluminium, titanium and boron, where n is the valance of a M, X denotes equal or different organic group chosen from alkyl group and electric group having up to 10 carbon atom
2. liberating the newly formed compound HS from the reaction mixture by distillation
3. separating the ketone from the organometallic compound formed by reaction between M(X)n and the alcohol in the mixture.
Thus, we concluded that above compound is seprated by forming organometallic compound.
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Can someone provide a answer with explanation for this question? Thanks!
Answer:
Explanation:
B
The acid dissociation constant ka for hcn is approximately 1 × 10−9. what is the value of the pkb?
Answer:
pKb = 5
Explanation:
To find the pKb, you need to (1) calculate the pka (using the pKa equation) and then (2) calculate the pKb (using the relationship between the pKa and pKb).
(Step 1)
pKa = -log (Ka)
pKa = -log (1 x 10⁻⁹)
pKa = 9
(Step 2)
pKa + pKb = 14
9 + pKb = 14
pKb = 5
Explain the impact that changing the temperature has on a system in a state of dynamic equilibrium. what will happen when the temperature of an exothermic reaction mixture at equilibrium is increased?
An endothermic reaction is favored by raising the temperature of a system in dynamic equilibrium. The mechanism absorbs the increased heat to offset the alteration you made. An exothermic reaction is favored by a system's temperature falling while it is in dynamic equilibrium.
Which of these reactions is endothermic?Any chemical process that takes heat from its surroundings is said to be endothermic. The reaction's activation energy comes from the energy that was absorbed. This kind of reaction is characterized by its icy sensation.
How does an exothermic reaction work?An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.
What kind of reaction is an exothermic reaction?Materials like hydrocarbons reacting with oxygen to produce combustion products like water and carbon dioxide is an example of an exothermic process.
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If the freezing point depression for a solution is 2.5°c and kf = 4.5°c/m, what is the molality of the solution?
If the freezing point depression for a solution is 2.5°c and kf = 4.5°c/m, the molality of the solution is
m= 0.56m
What is molality?While molecular weight (MW) and molecular weight (MW) may be used to measure concentration, molecular weight (MW) and molecular weight (MW) is used to measure molecular weight and concentration, respectively.
What is the molality of the solution?Generally, the equation for of freezing point of depression with molality is mathematically given as
[tex]\Delta T_{f} = k_{f} *m[/tex]
Therefore
m = 2.5/4.5
m= 0.56m
In conclusion, the molality of the solution is 0.56m
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The _______________________________ css3 property can be used to create multiple columns of text within a single element.
The column count property can be used to create multiple columns of text within a single element.
As heat records across europe became toast, england topped what torturous temp for the first time?.
England topped what torturous temp for the first time of 40°C
For the first time ever, Britain experienced temperatures on Tuesday of over 40 degrees Celsius, or 104 degrees Fahrenheit, as a fierce heat wave moved northwest, causing raging wildfires, fatalities, and forced home evacuations throughout a Europe that was terrifyingly unprepared to deal with the new reality of extreme weather.
What is heat wave ?A heat wave is a period of very hot weather that may also be accompanied by significant humidity, especially in nations with maritime climates. While there are several definitions, a heat wave is typically assessed in relation to the local climate and the average temperatures for the time of year.
Heat waves begin when high pressure in the atmosphere moves in and pushes warm air toward the ground. That air warms up further as it is compressed, and we begin to feel a lot hotter.Learn more about Heat wave here:
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Liquid acetaminophen for children is labeled 180 mg 3 ml. what is the strength expressed as grams per ml?
Liquid acetaminophen for children is labeled 180 mg 3 ml. The strength expressed as grams per ml is 0.060.
What is acetaminophen?
Acetaminophen is a medicine that is used to treat all kind of pains. Headache, menstrual pain, stomach ache, etc. It also used to reduce fever and cold/cough.
Liquid acetaminophen for children is labeled as 180 mg/ 3ml
The 180 mg will be divided by 3 ml
180 mg/ 3ml = 60 mg/ml
The amount will be multiplied by 1 /1000 to get the quantity equal.
60 mg/ml x 1g / 1000 g
60 x 1/ 1000 mg/ml = 0.060
Thus, the strength expressed as grams per ml is 0.060.
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what is the importance of metal reactivity series
Answer:
The reactivity series allows us to predict correctly how metals will react. Another importance is that so we can use displacement. We can spot a more reactive metal allowing us to displace a less reactive metal from a compound or an equation.
Hope this helped! Marking me brainliest will be very helpful!
Please comment below if you require more assistance from me! :)
Importance of Metal Reactivity Series are:
Metal Reactivity Series are used in Displacement reaction.It is used in the reaction between water and metals.In the reaction between metals and acids.What are metal reactivity series?
Metal reactivity series is a chart of listing the metals in the order of decreasing reactivity.
As in Displacement reaction less reactive metal is displaced by more reactive metal. By metal reactivity series we came to know which metal is displaced by another metal.When the metals from Potassium and Calcium react with cold water it will release Hydrogen gas.See the below reaction:
K(s) + [tex]H_2O[/tex] → KOH(aq) + 1/2 [tex]H_2[/tex] (g)
Potassium water Potassium Hydroxide Hydrogen
Metals like Lead and others which are more reactive than Lead can react with HCl and [tex]H_2SO_4[/tex] to form salts. We can predict the reaction by reactivity series.Lets see the reaction between Lead with Hydrochloric acid and Sulphuric acid.
Pb (s) + 2HCl (aq) → [tex]PbCl_2[/tex] (aq) + [tex]H_2[/tex] (g)
Lead Hydrochloric acid Lead chloride Hydrogen
Pb (s) + [tex]2H_2SO_4[/tex] → [tex]PbSO_4[/tex] + [tex]SO_2[/tex] + [tex]H_2O[/tex]
Lead Sulphuric acid Lead Sulphate Sulphur dioxide water
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Treatment of tetrahydrofuran with excess hbr results in the formation of what major organic product?
The treatment of tetrahydrofuran with excess HBr results in the formation of 1,4-dibromobutane as a major organic product .
THF which is tetrahydrofuran is reated with excess of HBr at 373 K .The product is 1,4-dibromobutane as a major organic product .
In the mechanism proton having positive charge is attack on electron rich oxygen and protonated it then bromine anion attack at adjacent carbon and break carbon - protonated oxygen bond and in he final step the hydroxyl group is protonated and remove as a water with attack at bromine anion .
Therefore , on treatment of tetrahydrofuran with excess HBr results in the formation of 1,4-dibromobutane as a major organic product .
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The conductivity of the solution in a reaction can be used to measure rates of reactions involving?
The conductivity of the solution in a reaction can be used to measure rates of reactions involving aqueous electrolytes. The correct option is D.
What is conductivity?Conductivity is a property that tells if a material can pass heat and light through it. Conductor are hose material that pass the heat and plight through it. Those material that do not transfer the heat are called non-conductor.
The conductivity of a solution in a reaction. To measure the change in the rates of a solution that involve the aqueous electrolyte, the conductivity of the solution is measured.
Thus, the correct option is D. aqueous electrolytes.
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The question is incomplete. Your complete question is given below:
These are the options:
Gaseous substances
brightly colored substances
organic compounds
aqueous electrolytes
QUESTION 1 Consider the following diagram that shows liquid water evaporating to form water vapour. Evaporation 1.1. Use chemical formulae to represent the process in the diagram above and indicate the phases of the substance undergoing this process (2) 1.2. Give three separation methods that can be used to reverse a physical change. (3)
The process of evaporation by which liquid water changes to vapor is shown by a chemical formulae as follows:
H₂O (l) → H₂O (g)Three separation methods that can be used to reverse a physical change include:
EvaporationCrystallizationFiltrationWhat is evaporation?Evaporation is the process by which liquids changes to vapor or gas spontaneously.
The rate of evaporation of a liquid increases with increase in temperature of the liquid. The rate of evaporation also increases with increase in surface area of the liquid exposed as well as with increase in wind speed.
The process by which liquid water changes to vapor can be represented by chemical formulae as follows:
H₂O (l) → H₂O (g)
In the equation above, the liquid phase of water, l, is undergoing change to gaseous phase, g.
b. Separation techniques are techniques which are used to separate mixtures of substances.
Three separation methods that can be used to reverse a physical change include:
Evaporation - used to separate a mixture of salt and waterCrystallization - used to separate a crystal solute from solutionFiltration - used to separate a solute from its suspensionIn conclusion, physical changes are those changes that are easily reversible and which no new products are formed.
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A quantity of an ideal gas is compressed to half its initial volume. the process may be adiabatic, isothermal or isobaric. the greatest amount of work is required if the process is?
the greatest amount of work is required if the process is adiabatic.The correct option is adiabatic.
The process in which heat is constant is called adiabatic process.
The The process in which temperature is constant is called isothermal process.
The process in which pressure is constant is called isobaric process.
The P-V diagram for adiabatic , isothermal and isobaric process is given below.
Work done in process = area encloses by P-V diagram axis . Since area under the curve is maximum for adiabatic process which is shown in the above diagram. So, work done by the gas will be maximum for adiabatic process.
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A gas sample occupies 10. 28 l at 8. 34 atm. its volume at 6. 98 atm (assuming constant temperature conditions) is:____.
a. 12. 28
b. 8. 60
c. 15. 61
d. 5. 66
12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.
What is ideal gas?Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.
In the limit of low pressures and high temperatures, where the molecules of the gas move almost independently of one another, all gases obey an equation of state known as the ideal gas law:
PV = nRT,
P is pressure of gas (atm)T is temperature of gas (K)where n is the number of moles of the gas R is the universal gas constant, 8.3145 joules/K.When Temperature is constant so, it follow Boyle's law:
P1 V1 = P2 V2
P1 = 8.34atm, V1 = 10.28 L, P2 = 6.98atm
V2 = P1 V1 / P2
V2 = 8.34atm x 10.28 / 6.98atm
V2 = 12.28 L
12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.
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Calculate the ph after 10. 0 ml of 0. 40 m naoh is added to 20. 0 ml of 0. 50 m hcl.
The pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .
Calculation ,
[ [tex]OH^{-}[/tex] ] = [tex]M_{1} V_{1} -M_{2} V_{2} /V_{1} +V_{2}[/tex]
where M is molarity and V is the volume .
[ [tex]OH^{-}[/tex] ] = 0. 50 M × 20. 0 ml - 0. 40 M × 10. 0 ml / 10. 0 ml +20. 0 ml
[ [tex]OH^{-}[/tex] ] = 6/30 = 0.2
pOH = -㏒[ [tex]OH^{-}[/tex] ] = -㏒ 0.2 = 0.7
pH = 14 - pOH = 14 - 0.7 = 13.3
Therefore , the pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .
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2H2O2 → 2H2O+O2+196.6 kj.
Hydrogen peroxide decomposes according to the reaction above. How much heat is released during the reaction when 5.0 moles of H2O2 decompose?
2mol of Hydrogen peroxide releases 196.6KJ heat
1mol releases
196.6/298.35mol releases
5(98.3)491.5KJAnswer: 491.5
Explanation:
Hope this helps :)
Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure between the locations. Diffusion occurs until ___________
Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.
What is the gas exchange in bloodstream?The gas exchange refers to the process by which oxygen is absorbed by red blood cells and carbon dioxide is removed through the respiratory system.
The process of gas exchange is carried out due to the differential diffusion rates of gases in the bloodstream (O2 and CO2), which facilitates the transference of these gases.
In conclusion, each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.
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Hypothesis: How will molecular size affect the rate of evaporation and how will this correlate
with temperature change? Why does molecular size affect evaporation rate?
A molecular size affects the rate of evaporation when the larger the intermolecular forces in a compound, the slower the evaporation rate and this correlates with temperature change.
Molecular size seems to have an effect on evaporation rates in that the larger a molecule gets or grows from a base chemical formula, its evaporation rate will get slower.
What is the molecular size?This is a measure of the area a molecule occupies in three-dimensional space as this relates to the physical size of an individual molecule.
Hence, we can see that a molecular size affects the rate of evaporation the larger the forces, the lower the rate.
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Write an equation that gives the relationship between the cross-sectional area (a), the volume (v), and the thickness of a cylinder.
On a distance-time graph, at 2 hours the graph is at a height of 20 meters, and at 3 hours it is at a height of 100 meters. What is the average speed for the interval?
Answer:
80 m/hr
Explanation:
Changes from 20 to 100 meters in ONE Hour
changes 80 meters in one hour = 80 m/hr
How many moles of sodium bromide can be produced from the reaction of 1. 03 moles of bromine gas with 0. 650 moles of sodium? 2 na(s) br2(g) ® 2 nabr(s)
There are 0. 650 moles of sodium bromide can be produced from the reaction of 1. 03 moles of bromine gas with 0. 650 moles of sodium .
Calculation ,
To find the number of moles of sodium bromide we have to write balanced chemical equation first .
[tex]2Na (s)+ Br_{2}(g)[/tex] → 2NaBr (s)
from the equation we can conclude that 2 moles sodium react with one mole of bromine to form 2 mole of sodium bromide .
But 1. 03 moles of bromine gas ( that is equal to the number of moles required in the equation) with 0. 650 moles of sodium ( that is half of required mole ) is given .
So, sodium is present as limiting reactant .
So , the number of sodium bromide formed is equal to the number of moles of sodium atom.
Hence , the number of sodium bromide formed = 0. 650 moles
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24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
pH of the solution after 24. 00 ml of the hcl has been added is 12.87
millimoles NaOH = mL x M = 24.00 mL x 0.25 M = 6.00
millimoles HCl = 24.00 mL x 0.10 M = 2.40
total volume = 48.00 mL
.................................NaOH + HCl ==>NaCl + H2O
initial.........................6.00.........0............0.........0
added.....................................2.40............................
change.................... -2.40......-2.40.........+2.40.... +2.40
equilibrium.................3.60.........0..............2.40.......2.40
The NaCl contributes nothing to the pH of the final solution. The pH is determined by the excess of NaOH present. (NaOH) = millimoles/mL = 3.60/48.00 = 0.075 M = (OH^-)
pOH = -log (OH^-). Then
pOH = -log (0.075)
pOH =1.1249
As we know,
pH + pOH = pKw = 14.00
pH=14-pOH
pH=14-1.1249
pH=12.87
What is pH?pH is a logarithmic measure of an aqueous solution's hydrogen ion concentration. pH = -log[H+], where log is the base 10 logarithm and [H+] is the concentration of hydrogen ions in moles per liter.
The pH of an aqueous solution describes how acidic or basic it is, with a pH less than 7 being acidic and a pH greater than 7 being basic. A pH of 7 is regarded as neutral (e.g., pure water). pH values typically range from 0 to 14, though very strong acids may have a negative pH and very strong bases may have a pH greater than 14.
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A grating has 470 lines/mm. how many orders of the visible wavelength 538 nm can it produce in addition to the m = 0 order?
Three complete orders on each side of the m=0 order can be produced in addition to the m = 0 order.
The ruling separation is
d=1 / (470mm −1) = 2.1×10⁻³ mm
Diffraction lines occur at angles θ such that dsinθ=mλ, where λ is the wavelength and m is an integer.
Notice that for a given order, the line associated with a long wavelength is produced at a greater angle than the line associated with a shorter wavelength.
We take λ to be the longest wavelength in the visible spectrum (538nm) and find the greatest integer value of m such that θ is less than 90°.
That is, find the greatest integer value of m for which mλ<d.
since d / λ = 538×10⁻⁹m / 2.1×10 −6 m ≈ 3
that value is m=3.
There are three complete orders on each side of the m=0 order.
The second and third orders overlap.
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Write an equation to represent the following reaction:
Al2O3 is heated with NaOH solution
Answer:
Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O
Explanation:
This is a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.
It is important that the new products have an overall charge of 0. To do this, some compounds must have more than 1 atom of each ion.
1.) Al(OH)₃
-----> Al³⁺ and OH⁻
-----> +3 + (-1) + (-1) + (-1) = 0
2.) Na₂O
-----> Na⁺ and O²⁻
-----> +1 + 1 + (-2) = 0
An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these values are unequal, you can add coefficients to modify the amounts of particular compounds.
The unbalanced equation:
Al₂O₃ + NaOH -----> Al(OH)₃ + Na₂O
Reactants: 2 aluminum, 4 oxygen, 1 sodium, 1 hydrogen
Products: 1 aluminum, 4 oxygen, 2 sodium, 3 hydrogen
The balanced equation:
Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O
Reactants: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen
Products: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen
PLEASE HELP, OVERDUE ASSIGNMENT.
The following observations were made about a substance.
I. reacts with magnesium to produce hydrogen gas
II. has a pH of 4.3
III. turns red litmus blue
IV. conducts electricity
Which of the above observations does not seem fit with the rest of the
observations?
Select one:
A. III
B. I
C. IV
D. II
3rd statement about this acidic reaction is not true
In acidic reactions, Litmus paper is available in red and blue varieties and is typically more trustworthy. To determine whether a solution is normal or acidic, use litmus paper. The acid or basic strength is not precisely outlined in Litmus's paper. Thus, Base causes red litmus to turn blue.
The pH scale has numbers 0 through 14. Seven is the neutral pH. Over 7 is a base, and anything below 7 is acidic.
H+ ions are present in all acidic reactions. As a result, whether mineral or organic, all acid solutions transmit electricity. They allow an electric current to flow through them.
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The primary sources of the acidity in acid rain are the gases ________. o3 and vocs o3 and so2 so2 and nox nox and n2o h2so4 and no
The primary sources of acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex] So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]
A chemical process that starts when gases like sulphur dioxide and nitrogen oxides are discharged into the atmosphere leads to acid rain. These substances have the ability to ascend very far into the sky, where they combine and react with oxygen, water, and other chemicals to produce acid rain, an additional form of acidic pollution.
Acidic particles corrode metal and hasten the deterioration of paint and stone. Power plants are the primary sources of SO[tex]_{2}[/tex] . Burning fossil fuels produces nitrogen dioxide (like gasoline). Cars, lorries, and power plants are the biggest producers of NO[tex]_{2}[/tex].
Therefore, The primary sources of the acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex].So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]
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When the ph of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is.
Answer:
decreased by a factor of 10
Explanation:
pH is defined in such a way that;
pH= −log10(H)
Where H represents the concentration of Hydronium or Hydrogen ions
Given that pH is changed from 1 to 2,
By rearranging the above formula , we get 10−pH = H
if pH=1,H=10−1=0.1Mif pH=2,H=10−2=0.01MTherefore, 0.1/0.01 = 10 and 0.1 > 0.01
Hence, the concentration of hydronium ions in the solution is decreased by a factor of 10
What is the best method to convert styrene, c6h5ch=ch2, to 2-phenylethanol with minimal side product formation?
Styrene is an organic chemical used to make rubber, latex, resins, etc. It can be best converted using the anti-Markovnikov rule by (1) BH₃ - THF and (2) H₂O₂, NaOH. Thus, option B is correct.
What is anti- Markovnikov rule?The anti-Markovnikov rule defines the attachment of the substituent group to the least substituted carbon than the more substituted groups. This is due to the induction and hyperconjugation effect.
To convert styrene, the alcohol group from sodium hydroxide must be added to the least substituted carbon of the compound using other reagents like BH₃ - THF and hydrogen peroxide.
Therefore, option B. (1) BH₃ - THF and (2) H₂O₂, NaOH can be used to convert styrene.
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Your question is incomplete, but most probably your full question was, What is the best method to convert styrene, C₆H₅CH=CH₂, to 2-phenyl ethanol with minimal side product formation?
H₂O, H₂SO₄(1) BH₃ - THF and (2) H₂O₂, NaOH(1) HBr (2) KOH, H₂O(1)HBr, peroxides (2) NaOH, H₂OWhat atomic or hybrid orbitals make up the sigma bond between c2 and h in ethylene, ch2ch2?
Explanation:
According to orbital hybridization theory, in ethene the C atoms are using sp2 hybrid orbitals. This leaves one unhybridized p orbital available to form the second bond (Pi bond) in the C-C double bonds.
One sp2 hybrid orbital from each C atom overlap to form one sigma bond between the two carbon atoms. One p orbital from each C atom then overlap to form a pi bond that completes the C-C double bond. The H atoms are bonded via sigma bonds to the C atoms when the H s orbitals overlap with the remaining sp2 hybrid orbitals from each C.
Alkali metals nitrates on heating give the corresponding __ and oxygen.
Alkali metals nitrates on heating give the corresponding nitrogen dioxide and oxygen.
What are alkali metals?These are the metals which forms alkali when dissolved in water. They are any of the soft, light, reactive metals of Group 1 of the periodic table.
Some examples of alkali metals are as follows:
LithiumSodiumPotassiumCesiumrubidiumfranciumA periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same column.
So therefore, alkali metals nitrates on heating give the corresponding nitrogen dioxide and oxygen.
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