The number of electrons, which are present in the nonbonding π molecular orbital of the allyl anion is "0".
Anions, cations, but also allylic radicals have always been frequently mentioned as reaction intermediates. Each one has three adjacent [tex]sp^{2}[/tex]-hybridized carbon centers, and they all rely on resonance for stability. Two resonance structures would be used to present each species, with the charge as well as unpaired electron scattered across both the 1,3 and 0 positions.
The Aufbau principle states that these orbitals would fill up based on the order of stability, therefore a typical pi bond, will have 2 electrons in the Pi orbital as well as zero in the Pi* orbital.
Therefore, the correct answer will be option (d)
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The reaction of hydrogen bromide(g) with chlorine(g) to form hydrogen chloride(g) and bromine(g) proceeds as follows:
2HBr(g) + Cl2(g) -->2HCl(g) + Br2(g)
When 23.5 g HBr(g) reacts with sufficient Cl2(g), 11.8 kJ is evolved.
Calculate the value of △,H for the chemical equation given.
Chemical reactions can be detected by: _________
a) color change from reactants to products
b) the production of a precipitate
c) a change in temperature
d) an increase of surface area
(A) Color changes from reactant to products.
The rate of a chemical reaction is calculated by dividing the rate of change in a reactant or product's concentration by the coefficient from the equation's balanced state.
2N2O5(g) → 4NO2(G) + O2(g)
A change in color and the appearance of bubbles are two indications of a chemical shift.In a chemical process, the makeup of the components changes; in a physical change, the appearance, smell, or straightforward exhibition of a sample of matter changes without changing its composition.
Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. Therefore, from now on, we will simply refer to bodily "reactions" as physical changes.
Physical modifications must only cause a variation in display without altering the composition. Typical modifications include, but are not limited to:
Texture\Color\Temperature\Shape
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How many moles of argon are in 13.9 g of argon?
Answer:
0.348 moles Ar
Explanation:
You can determine the moles of argon (Ar) by multiplying the given mass by the atomic mass of argon. This number gives the mass in grams per 1 mole. It is important to arrange the conversion in a way that allows for the cancellation of units. The final answer should have 3 significant figures to match the sig figs of the given value (13.9 = 3 sig figs).
Atomic Mass (Ar): 39.948 g/mol
13.9 g Ar 1 mole
----------------- x ------------------ = 0.348 moles Ar
39.948 g
What process permanently rearranges the basic structure of curly hair into a straight or smoother form?
Chemical hair relaxing is the process that permanently rearranges the basic structure of curly hair into a straight or smoother form.
Chemical relaxers disrupt disulfide bonds by using chemicals and extremely high heat.
The procedure of permanently altering the fundamental structure of excessively curly hair into a straight shape is known as chemical hair relaxing.
Professionally performed, it leaves the hair straight and in good enough condition to be styled into practically any shape.
Sodium hydroxide, which does not require pre-shampooing, and ammonium thioglycolate, which may require pre-shampooing, are the two main categories of hair relaxers.
Processing, neutralizing, and conditioning are the three fundamental phases in all chemical hair relaxing procedures.
Hence, Chemical hair relaxing is the process that permanently rearranges the basic structure of curly hair into a straight or smoother form.
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Calculate the number of atoms in a 5.31 x 10³ g sample of sodium.
number of atoms:
Answer:
no of atoms = 13.9 x 10^25
Explanation:
No. of moles = mass of compound / molar mass of compound
As ; mass of sodium = 5.3 x 10^3 g
Molar mass of sodium = 22.9 g/ mol
putting values
n = 5.3 x 10^3 / 22.9
n = 231.4 mol
Also; no of mol (n) = no of particles / Avagadros number
so no of particles = n x Avagadros no.
put n = 231.4 and Avagadros no = 6.023 x 10^23
no of particles = 231.4 x 6.023 x 10^23
= 13.9 x 10^25
Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is its formula?
Answer: KMnO4 (subscript 4)
Which term describes this molecular shape?
Answer:
B.) Trigonal planar
Explanation:
This molecule has 3 bonds and no lone pairs. The angles are all 120° and the bonds are within the same plane. These molecules have the molecular shape of trigonal planar.
What volume of H2 gas will be produced if 60 L of ammonia, NH3, is decomposed into H2 and N2, assuming that all conditions are at STP?
a)
30 L
b)
90 L
c)
60 L
d)
120 L
e)
150 L
need answer ASAP!!
Answer:
I think the answer is c I'm not sure but probaly dont put c if your. ot sure try looking up the answers that helps me alot through my word
The volume of H₂ gas produced is approximately 90 L, Option (b) is correct.
To find the volume of H₂ gas produced when 60 L of ammonia (NH₃) is decomposed, we use the balanced chemical equation for the decomposition of ammonia:
2 NH₃(g) → 3 H₂(g) + N₂(g)
According to the equation, 2 moles of ammonia produce 3 moles of hydrogen gas (H₂). At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 liters.
First, calculate the moles of ammonia present in 60 L:
Moles of NH₃ = Volume / Molar Volume at STP = 60 L / 22.4 L/mol ≈ 2.68 moles
Using the stoichiometric ratio, 3 moles of H₂ are produced from 2 moles of NH₃. So, we can calculate the moles of H₂ produced:
Moles of H₂ = (3/2) * Moles of NH₃ ≈ (3/2) * 2.68 moles ≈ 4.02 moles
Now, find the volume of H₂ gas produced:
Volume of H₂ = Moles of H₂ * Molar Volume at STP = 4.02 moles * 22.4 L/mol ≈ 89.9 L
Rounded to one decimal place, the volume of H₂ gas produced is approximately 90 L, which corresponds to option b).
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What is the molar solubility of a saturated solution of magnesium hydroxide, mg(oh)2, in water? the ksp of mg(oh)2 is 1. 2×10^–11
The molar solubility of saturated solution of magnesium hydroxide in water will be 1.4 × [tex]10^{-4}[/tex].
The concentration of such ions in a suitable solvent that will be in equilibrium with both the solid substance is known as the solubility product, or Ksp, of such an ionic compound.
When a chemical substance in the solid form would be in chemical equilibrium with such a solution of that molecule, a solubility equilibrium would be a sort of dynamic equilibrium that develops.
The molar solubility of magnesium hydroxide can be expressed as:
[tex]K_{sp} = [Mg^{2+} ][OH^{-} ]^{2}[/tex]
Let the molal solubility will be S.
[tex]K_{sp} = S(S^{2} )\\1.2 * 10^{-11} = 4S^{3} \\(S)^{3} = 0.3 *10^{-11} \\S = 1.4 *10^{-4}[/tex]
Therefore, the molar solubility of saturated solution of magnesium hydroxide in water will be 1.4 × [tex]10^{-4}[/tex].
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What is regular (specular)
reflection?
A. when all light rays come in at different angles of
incidence
B. when the rays of light reflect at different angles
C. when all light rays reflect at the same angle
D. when all light rays are perpendicular
Answer:
specular reflection reflects all light which arrives from a given direction at the same angles where diffus reflection reflects light in a broad range of direction
What is the C-terminal amino acid in the tetrapeptide
Val-Thr-Phe-Pro?
O threonine
O phenylaline
O valine
O proline
The C-terminal amino acid in the tetrapeptide is valine.
Valine is one of three branched-chain amino acids that enhance energy, increase endurance, and aid in muscle tissue recovery and repair. This group also lowers elevated blood sugar levels and increases growth hormone production.
The cease with a free carboxyl group is called the C-terminal amino acid residue. Peptides are named from the N-terminal acid residue to the C-terminal amino acid.
The C-terminal amino acid may be decided by way of addition of carboxypeptidases, enzymes which cleave amino acids from the C-terminal. A time direction ought to be carried out to look which amino acid is launched first.
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The C-terminal amino acid in the tetrapeptide is c) Valine.
The C-terminal amino acid is direct confirmation of the sequence of C terminal of the proteins that are expressed. It is present at the end of the protein sequence. A free carboxyl group is called the C-terminal amino acid residue.
A tetrapeptide is a chain containing four amino acids producing a Chain of amino acids.
Valine is three branched chain amino acids that is needed for protein synthesis. It enhances:
- Energy
- Muscle Growth
- Muscle Regeneration
- Increase endurance
- Muscle Recovery
Valine lowers elevated blood sugar levels. Also, it increases growth hormone production in the body.
Valine is found through following food:
MeatFishSoyDairyPeptides are named from the N-terminal acid residue present in the start to the C-terminal amino acid present at the end.
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Choose the molecules that contains sphingosine.
a. sphingomyelins molecule
b. molecule
c. molecule
d. a phosphatidylcholine
Answer:
a phosphatidylcholine
The molecule that contains sphingosine is a phosphatidylcholine compound.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a ________ group
The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.
What is the Carboxyl Group ?The carboxyl group is an organic functional group. Carboxyl group contains two functional groups that is carbonyl group (C = O) and hydroxyl group (OH) which attached with single carbon atom. The structural formula for carboxyl group is RCOOH where R is alkyl or aryl group.
Example of Carboxyl group: HCOOH (Methanoic Acid) , CH₃COOH (Ethanoic acid) etc.
Thus from the above conclusion we can say that The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.
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1.50 moles of N2 at 825 mmhg and 303 K are contained in a 34.3 L bottle. What is the pressure of the system if an additional 1.00 mole of gas is added to the bottle and the temperature is reduced to 273 K?
Answer:
1240 mmHg
Explanation:
Since volume is being held constant, we can use the following variation of the Ideal Gas Law to find the new pressure.
[tex]\frac{P_1}{T_1N_1}=\frac{P_2}{T_2N_2}[/tex]
In the equation, "P₁", "T₁", and "N₁" represent the initial pressure, temperature, and moles. "P₂", "T₂", and "N₂" represent the final pressure, temperature, and moles. Your answer should have 3 sig figs to match the sig figs of the given values.
P₁ = 825 mmHg P₂ = ? mmHg
T₁ = 303 K T₂ = 273 K
N₁ = 1.50 moles N₂ = 1.50 + 1.00 = 2.50 moles
[tex]\frac{P_1}{T_1N_1}=\frac{P_2}{T_2N_2}[/tex] <----- Formula
[tex]\frac{825 mmHg}{(303K)(1.50 moles)}=\frac{P_2}{(273 K)(2.50 moles)}[/tex] <----- Insert values
[tex]\frac{825 mmHg}{454.5}=\frac{P_2}{682.5}[/tex] <----- Simplify denominators
[tex]1.815=\frac{P_2}{682.5}[/tex] <----- Simplify left side
[tex]1238.86 mmHg={P_2}[/tex] <----- Multiply both sides by 682.5
[tex]1240 mmHg={P_2}[/tex] <----- Apply sig figs
Answer:1240
Explanation:
Is this equation balanced and in the lowest form? 4NH3 → 2N2 + 6H2
A.
Yes, because there are equal amounts of atoms of each element on both sides.
B.
No, because the coefficients could be reduced to 2,1, and 3.
C.
Yes, because the coefficients are in their lowest whole number ratio.
D.
No, because the coefficients could be reduced to 2, 2, and 4.
Answer:
B.) No, because the coefficients could be reduced to 2,1, and 3.
Explanation:
The equation is not in its lowest molar ratio form. In this case, all of the coefficients can be divided by 2 and still result in whole numbers.
As such, the correct balanced equation is:
2 NH₃ ----> N₂ + 3 H₂
three difference between radicle and plumule
Answer:
1)RADICLE ->It is the embryonic root of the plant.
PLUMULE ->It is the embryonic shoot of the plant.
2)RADICLE ->It grows downwards into the soil.
PLUMULE ->It grows upwards into the air.
3)RADICLE ->Radicle is the first part of the seedling.
PLUMULE -> Plumule grows after the radicle.
4)Radicles are negatively phototropic. Plumule is positively phototropic.
i am glad i helped
A glow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.
A glow stick will glow longer at lower temperatures than at room temperature, one can infer from the observation. Temperature and reaction time are the test variables.
We notice in this reaction that a glow stick stored in the freezer lights for a longer period of time than a glow stick stored at normal temperature. This implies that temperature affects how long a response lasts.
The most straightforward explanation for this observation is that glow sticks glow longer in colder temperatures than they do at room temperature; as a result, glow sticks kept in the freezer are observed to glow longer than glow sticks kept at room temperature.
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What volume will 5.6 moles of sulfur hexafluoride
(SF6) gas occupy if the temperature and pressure of
the gas are 128°℃ and 9.4 atm?
Answer:
19.6 L SF₆
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (0.08206 atm*L/mol*K)
-----> T = temperature (K)
After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation and simplify to find "V".
P = 9.4 atm R = 0.08206 atm*L/mol*K
V = ? L T = 128 °C + 273.15 = 401.15 K
n = 5.6 moles
PV = nRT
(9.4 atm)V = (5.6 moles)(0.08206 atm*L/mol*K)(401.15 K)
(9.4 atm)V = 184.3429
V = 19.6 L
340. ml of a 0. 150 m solution of nh3(aq) is titrated with 0. 100 m hcl. calculate the ph of the solution after 350. ml of hcl has been added. (ka(nh4 ) = 5. 6 x 10-10)
340. ml of a 0. 150 m solution of nh3(aq) is titrated with 0. 100 m hcl. the ph will be 7 of the solution after 350. ml of hcl has been added. (ka(nh4 ) = 5. 6 x 10-10).
What is ph?The ph. of a solution gives information about the concentration of hydrogen ion in the solution or the solution is acidic or basic in nature if the given value is 7 then the solution is neutral or greater then 7 then basic and less then 7 then acidic.
Here, NH3 is a base while adding HCl to it the reaction gets neutralized and known as neutralizatio reaction and attend the ph. of value 7.
After due to the formation of hydronium ion the ph. would be less then 7.
Therefore, the ph. is 7.
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Select the correct boxes. which two elements have the same number of valence electrons?
Carbon and silicon have same number of valance electrons which is 4 electrons
Now, Barium is a 2nd group element. So, it has two valance electrons.
Silicon is a 16th group element and it has 4 valance electrons as does the carbon. This is because they both stay in the same group in the periodic table.
Neon is a noble gas which has 8 valance electrons and stays in the 18th group.
Therefore, carbon and silicon have same number of valance electrons which is 4 electrons.
What are Valence electrons ?The electrons in an atom's outermost shell, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with two in the 2s subshell and four in the 2p subshell.
The number of valence electrons for neutral atoms is the same as the number of the atom's main group. A periodic table element's column can be used to determine its main group number. For instance, carbon, which belongs to group 4, has four valence electrons. Group 6 oxygen contains six valence electrons.Learn more about Valence electrons here:
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Write the mass of a neutron without using scientific notation and powers of ten. Include units in your answer.
{not a bot question} {physical science 1110}
The mass of a neutron without using scientific notation and powers of ten. The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (AMU).
Particle Symbol Mass (amu)
proton p+ 1
electron e− 5.45 × 10−4
neutron n0 1
A neutron is an atom with the atomic number 10. Its atomic mass is 20.179, resulting in 10 neutrons and 10 protons in the nucleus, and 10 electrons outside. Neon; Neon, Ne is a colorless noble gas and also the second lightest noble gas. Neutron and proton masses are 1.0087 amu and 1.0073 amu respectively.
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3. 2.71x1022 molecules of CO2 to atoms I NEED HELP
2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.
What is number of molecules?The number of molecules in an element is the combination of atoms in that element.
The number of molecules of an element can be calculated by multiplying the number of moles of that element by Avogadro's number, which is 6.02 × 10²³.
However, the number of molecules in a substance is equivalent to the number of atoms in that substance.
Therefore, 2.71 x 10²² molecules of CO2 is equivalent to 2.71 x 10²² atoms.
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When nahco3 completely decomposes, it can follow this balanced chemical equation: 2nahco3 → na2co3 h2co3 determine the theoretical yields of each product using stoichiometry if the mass of the nahco3 sample is 3.80 grams. (show work for both) in an actual decomposition of nahco3, the mass of one of the products was measured to be 2.36 grams. identify which product this could be and justify your reasoning. calculate the percent yield of the product identified in part b. (show your work)
Theoretical yield = 2.397
The product could be sodium carbonate
percent yield = 98.456%
When nahco3 completely decomposes, it can follow this balanced chemical equation:
2nahco3 → na2co3 h2co3
If the mass of the NaHCO3 sample is 3.80 g, we must use stoichiometry to calculate the theoretical yields of each of the products.
mass of NaHCO₃ = 3.80 g
molar mass of NaHCO₃ = 84 g/mol
so the no of moles of NaHCO₃ = 3.80/84 = 0.0452 mol
You see, one mole of sodium carbonate and one mole of hydrogen carbonate are produced from two moles of sodium bicarbonate.
so, the no of moles of sodium carbonate = 0.0452/2 = 0.0226 mol
∴ mass of sodium carbonate ( Na₂CO₃) = no of moles of Na₂CO₃ × molar mass of Na₂CO₃
= 0.0226 × 106 ≈ 2.397 g
no of moles of hydrogen carbonate = 0.0452/2 = 0.0226 mol
mass of the hydrogen carbonate ( H₂CO₃) = no of moles of H₂CO₃ × molar mass of H₂CO₃
= 0.0226 × 62 g = 1.401 g
mass of one of the products was measured to be 2.36 g , from above data, we can say it must be sodium carbonate because value is the nearest of 2.397 g.
percentage yield = experimental yield/theoretical yield × 100
here experimental yield of Na₂CO₃ = 2.36 g
and theoretical yield of Na₂CO₃ = 2.397 g
∴ % yield = 2.36/2.397 × 100 ≈ 98.456%
Therefore the percentage yield of the product is 98.456%
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THEIR ANSWER IS RIGTH, ALL THREE PARTS
Theoretical yeild is 2.397, sodium bicarbonate is the possible product I chose, and percent yeild is 98.456
A substance with a high [h ] would likely have which additional characteristics?
Answer:
Is [h] really [H]? What characteristics are mentioned?
Explanation:
A high [H} means high acid concentration.
For the reaction ag2s(s) ⇌ 2ag (aq) + s2−(aq). What happens to the equilibrium position if the amount of silver ion is halved?
The equilibrium shifts to the right.
What is Equilibrium law?According to this law, if a process in equilibrium is subjected to change in the factors that affect equilibrium, then the equilibrium shifts in a specific direction which tends to counteract the effect of change imposed.The common ion effect is a result of this lawFactors affecting equilibrium areChange in concentration of reactants or productChange in temperatureChange in pressureAdding an inert gasAccording to this law,
The concentration of the product is decreased and hence, the equilibrium shifts to the right.
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The external expression of a mineral’s orderly internal arrangement of atoms is referred to as:____.
The external expression of a mineral’s orderly internal arrangement of atoms is referred to as its crystal form
Internally, a mineral's crystal structure, or regular, repeating arrangement of atoms, reflects the chemical makeup of the mineral. A CHEMICAL FORMULA, which only lists the proportions of the various elements and groups of elements in the mineral, can be used to describe the composition of a mineral. For minerals with a narrow range of composition, the latter idea—groups of elements—comes into play. Color, hardness, luster, crystal formations, density, and cleavage are characteristics that aid geologists in determining a mineral's identity in a rock. The atomic structure of a crystal essentially determines its form, cleavage, and hardness. Chemical composition is the main determinant of color and density.
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Which carboxylic acid derivative can be made from another carboxylic acid derivative by a dehydration reaction?
Acid nitric oxide
When a carboxylic acid combines with an acid chloride in the presence of a base, anhydrides are frequently produced.
The Fischer esterification, which involves reacting a carboxylic acid with an alcohol to produce an ester: RCO2H + R′OH RCO2R′ + H2O, is a well-known example of a dehydration reaction. The presence of a dehydrating agent, or a chemical that reacts with water, is frequently necessary for these processes.
Although an ester is produced when an acyl chloride and an alcohol react, this conversion cannot be stopped by adding HCl to the reaction mixture. One of the most popular carboxylic derivatives is esters.
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Which are products of nuclear fusion? check all that apply. energy helium gas high temperatures hydrogen gas low pressure
The products created during nuclear fusion are Energy and Helium Gas
Overall, two positrons, two neutrinos (which convert two of the protons into neutrons), and energy are released along with the fusion of four protons into one alpha particle.
What is Nuclear fission ?Nuclear fission is a nuclear reaction in which low energy neutrons are used to smash the nucleus of an atom into smaller nuclei. In this process, a large amount of energy is released. Nuclear fission reactions are employed in nuclear power reactors due to their simplicity and high energy output.
What is Nuclear fusion ?When two or more atoms come together to produce one heavier nucleus, the process is known as nuclear fusion. This process releases a tremendous quantity of energy, far more than the energy
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What is the daughter nucleus produced when zn63 undergoes electron capture? replace each question mark with the appropriate integer or symbol
The daughter nucleus that is produced is ₂₉⁶³cu.
What is Electron capture?
The process of drawing an electron to the nucleus, where it combines with a proton to create a neutron and a neutrino particle, is known as electron capture.
The daughter nucleus is the nucleus that is made by the parent nucleus. The nucleus that remains after the decay is called the daughter nucleus.
Here is the chemical formula for the reaction that results in the electron capture of the zinc-63 nucleus:
[tex]_A^ZX + e^- = _A^Z_-_1 Y + ye[/tex]
[tex]_3_0^6^3Zn\; + e^- = _2_9^6^3Cu + ye[/tex]
Thus, the daughter nucleus produced when zn63 undergoes electron capture is [tex]_2_9^6^3Cu[/tex].
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Draw the products formed when each ester is treated with lithium hydroxide and water. ch3ch2ch(ch3)oc=och(ch3)2−→−−h2olioh
The products formed when ester is treated with lithium hydroxide and water is given below.
[tex]CH_{3} CH_{2} CH(CH_{3} )OC=OCH(CH_{3} )_{2} +LiOH +H_{2} O[/tex]→[tex]CH_{3} CH_{2} CH(CH_{3} )OH+LiOC=OCH(CH_{3} )_{2} +H_{2} O[/tex]
The products formed when ester is treated with lithium hydroxide and water is alcohol and salt of acid.
The reaction of ester with water in the presence of base is called hydrolysis of ester in the presence of base. The product of hydrolysis of of ester in the presence of base ( lithium hydroxide ) is alcohol and salt of acid.
The hydrolysis of ester is also takes place in the presence of acid and give the product of alcohol and carboxylic acid. Lithium hydroxide is an inorganic base and it is soluble in water and slightly soluble in ethanol. The Lithium hydroxide is less soluble in water as compare to sodium hydroxide due to the anomalous behavior shown by lithium from rest of the family member.
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