The relative atomic mass of an element R with two isotopes 63R and 65R is 63.64.
How to calculate relative atomic mass?Relative atomic mass is the ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon-12 atom.
The relative atomic mass (RAM) of an element with two isotopes can be calculated by multiplying the mass of each isotope by its respective percentage abundance as follows:
63R = 68%65R = 32%RAM = (63 × 0.68) + (65 × 0.32)
RAM = 42.84 + 20.8
RAM = 63.64
Therefore, 63.64 is the relative atomic mass of the element R.
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The angular momentum of an electron will be:
The angular momentum of an electron is the product of its mass, velocity and radius of orbit mvr. This is equivalent to nh/2π.
What is angular momentum ?Angular momentum is the rotational analogue of linear momentum. The momentum of a moving object is the ability to bring the force acting on it make the maximum displacement.
Momentum is the product of mass and velocity. According to Bohr theory of atom, the angular momentum , that is the momentum associated with an object moving through a circular path is the product of radius of the path and linear momentum.
Linear momentum = mv
angular momentum = mv r.
Hence, the angular momentum of an electron is mvr.
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Answer:
Perpendicular to its orbit
Explanation:
The angular momentum of an object in circular motion, whether an electron or a macroscopic object, will be perpendicular to the plane of circular motion.
A group of covalently bonded atoms that has an overall electrical charge is called a(n):a. ionic compoundb. anionc. polyatomic iond. catione. molecule
Answer:
polyatomic ion
Explanation:
Answer and Explanation: A group of covalently bonded atoms that has an overall electrical charge is called a polyatomic ion, which is the choice c.
Why is trapped air a good insulator?
A It stops heat transfer.
B It is actually a poor insulator.
C It increases heat transfer.
D It reduces heat transfer.
The reason why trapped air is a good insulator is that; It reduces heat transfer. Option D
What is a thermal insulator?It is important that we must be able to explain what we mean by the term insulator. When we are talking about an insulator what we mean is the kind of substance that can be shown that its temperature does not easily chnage when heat is applied. In other words, we know that the insulator does not easily allow heat to pass through it as it were.
There are many examples of the thermal insulators that we have such as the plastics, rubber as well as wood and some types of glass to a large extent.
Let is also be know that air does not allow heat to be able to pass through it so easily hence we can say that trapped air is an example of an insulator.
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when 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, what is the maximum number of grams of water that can be formed? In other words, what is the theoretical yield of H2O?
a. 36.0 G
b. 58.0 G
c. 18.0 G
d. 20.0 G
e. 28.9 G
The maximum number of grams of water that can be formed is 28.9 g.the moles of C2H6 and O2
1. Calculate the moles of C2H6 and O2:
Moles of C2H6 = 20.0 g / (2*12.011 g/mol) = 1.665 mol
Moles of O2 = 60.0 g / (2*15.999 g/mol) = 2.50 mol
2. Calculate the mole ratio of C2H6 to O2:
Moles of C2H6 / Moles of O2 = 1.665 mol / 2.50 mol = 0.666
3. Calculate the moles of H2O and CO2 that can be formed:
Moles of H2O = 0.666 * 2.50 mol = 1.665 mol
Moles of CO2 = 0.666 * 1.665 mol = 1.110 mol
4. Calculate the theoretical yield of H2O:
Theoretical yield of H2O = 1.665 moles * (2*1.008 g/mol) = 28.9 g
The maximum number of grams of water that can be formed is 28.9 g.
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hi, what are the specific body parts that land animals and water animals use to efficiently and effectively used to survive on land and in water?
get free 10 points
Answer:
REWORD THIS
If this help please set brainly brainliest.
Land animals and water animals have evolved different physical characteristics to enable them to survive and thrive in their respective environments.
For land animals, some important adaptations include strong legs and paws to enable movement on solid ground, and a streamlined body shape to reduce drag while running. Water animals, on the other hand, have evolved fins, flippers, and other appendages to help them swim through the water. They may also have gills or other specialized organs to allow them to breathe underwater.
Some examples of specific body parts that are adapted for living on land or in water include:
- Land animals: paws, hooves, claws
- Water animals: fins, flippers, gills, scales
- Both: Lungs
It's worth noting that some animals, such as amphibians and reptiles, are adapted for both land and water environments, and may have a combination of these physical characteristics.
Answer:
lungs
Explanation:
animal on land use lungs to breathe, the animals in the water use lungs to breath also
Does an exothermic absorb or release energy?
Answer:
An exothermic releases the heat.
Answer:
to answer your question, an exothermic reaction releases energy.
Explanation:
An exothermic reaction is a chemical reaction that releases energy in the form of heat, light, or sound. It is a reaction that releases energy to the surroundings.:)
Which of the following is an example of a compound?
Multiple Choice
O O2
O CI
O H2
O C6H1206
2. How many molecules of ammonia can be created when four molecules of nitrogen are combined with four molecules of hydrogen
The number of molecules of ammonia formed are: 8/3
Explanation:
The number of Nitrogen molecules is 4.
The number of Hydrogen molecules is 4.
The balanced chemical equation for formation of ammonia is:
N2 + 3H2 ----- 2NH3
According to the above equation, 3 molecules of H2 require one molecule of N2.
So, 4 molecules of H2 will require 4/3 molecules of N2
Hydrogen acts as a limiting reagent. This means that the number of ammonia molecules produced depends only on the number of hydrogen molecules.
Therefore, for 4 molecules of Hydrogen, the number of ammonia molecules produced is 8/3
A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation.
A student sets up and solves the following equation to solve a problem in solution stoichiometry. The missing units are moles/L.
When requested to assess the division's units, we must consider that the units on the other side of the division will be canceled. In this case, considering the following dimensional analysis operation:
(0.63 mol) (1 mL/10⁻³ L)/(7.2mol/L) = 88. mL
Since they are used as both denominators and numerators, we can see that milliliters cancel each other out, resulting in moles/L as the final units.
Therefore, the missing units of equation (0.63 mol) (1 mL/10⁻³ L)/(7.2_) = 88. mL is moles/ L
Your question is incomplete but most probably your full question was
A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. (0.63 mol) (1 mL/10⁻³ L)/(7.2_) = 88. mL
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3. Calcium + water yields calcium hydroxide+ hydrogen Balanced:
Complete Ionic:
Net Ionic:
Question: In Part C, #2 and #3, did your observations concerning the flaming wooden splint agree with the reactions you wrote for this part? Explain.
Calcium reacts with water results in formation of calcium hydroxide and the balanced equation for it is
Ca(s) + H2O = Ca(s) + 2H2O(l) = Ca(OH)2(s) + H2 (g)
Balanced Ca(s) + H2O = Ca(s) + 2H2O(l) = Ca(OH)2(s) + H2 (g)
Ca(s) + 2H2O(l) to Ca(OH)2(s) + H2: complete ionic equation
net-ionic equation
Ca(s) plus 2H2O(l) becomes Ca(OH)2(s) plus H2 (g)
Calcium sinks in water, which causes a less vigorous reaction that leads to the formation of a turbid calcium hydroxide solution and the release of hydrogen gas. In all the instances where the release of H2 has occurred, which agrees with the reaction we wrote here, flaming wood splint burned with a hotter flame.
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How do lungs work? (animals)
Task: Performance Task
Answer:
On the first inhalation, air flows from the trachea to the rear air sacs. On the first exhalation, air flows from the posterior air sacs to the lungs. On the second inhalation, air flows from the lungs to the front air sacs. On the second exhalation, air flows from the front air sacs out through the trachea.
amides having fewer than __________ carbons are generally water soluble.
Explanation:
gas breath ofo ut by people and animal amount other different
1. Examine the IR spectrum of cis-norbornene-5,6-endo-dicarboxylic anhydride, (Fig.48.8, pp. 630): what do the signals at 1750 cm-1 and 1838 cm-1 indicate?2. Explain the following questions regarding the possible contamination of the final isolated product with dicyclopentadiene (the cyclopentadiene dimer).a. Since "cracked" cyclopentadiene can spontaneously dimerize back to dicyclopentadiene, could the dimer be formed as an unwanted "by-product" during the experiment?b. How does the experimental procedure minimize contamination of the final isolated (desired) product with this (undesired) "by-product"?
The IR spectrum of cis-norbornene-5,6-endo-dicarboxylic anhydride typically shows signals at 1750 cm-1 and 1838 cm-1. The signal at 1750 cm-1 is typically associated with the carbonyl stretch of the anhydride functional group, while the signal at 1838 cm-1 is typically associated with the C=C stretch of the conjugated double bond.
a. Yes, it is possible that the dimer, dicyclopentadiene, could be formed as an unwanted "by-product" during the experiment if the cyclopentadiene is "cracked" or thermally degraded.
b. To minimize contamination of the final isolated product with this "by-product", the experimental procedure should include measures such as:
Using a low reaction temperature to prevent thermal degradation of the cyclopentadiene Using a large excess of the starting material to minimize the formation of the dimer Using a high purity of the starting material to minimize the presence of impurities that could lead to the formation of the dimer Using a column chromatography to separate the desired product and the by-product Using a NMR, IR or mass spectrometry to confirm the purity of the final isolated product.What is IR spectrum?The IR spectrum is a powerful analytical tool that can be used to identify and confirm the presence of specific functional groups in a molecule. In the case of cis-norbornene-5,6-endo-dicarboxylic anhydride, the signals at 1750 cm-1 and 1838 cm-1 are characteristic of the anhydride and conjugated double bond functional groups, respectively.
The signal at 1750 cm-1 is associated with the stretching of the carbonyl bond of the anhydride functional group, which is a strong absorption band. The signal at 1838 cm-1 is associated with the stretching of the C=C double bond of the conjugated double bond, which is also a strong absorption band.
Therefore, Regarding the contamination of the final isolated product with dicyclopentadiene, it is important to note that cyclopentadiene can spontaneously dimerize back to dicyclopentadiene, especially at high temperatures.
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3. Find the period 2 elements (atomic numbers #3-10) and the period 3 elements (#11 - 18). Do period 2 and period 3 have the same trend?
Period 2 elements are Lithium (Li), Berillium (Be), Boron (B), Carbon (C), Nitrogen ( N), Oxygen (O),
Fluorine (Fe), Neon (Ne). Period 3 elements are Sodium (Na), Magnesium (Mg), Aluminum (AI), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (CI, Argon, (Ar)
do period 2 and period 3 have the same trend ? (if they do can you explain a bit ?)
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Period 2 elements are Lithium (Li), Berillium (Be), Boron (B), Carbon (C), Nitrogen ( N), Oxygen (O), Fluorine (Fe), Neon (Ne).
Period 3 elements are Sodium (Na), Magnesium (Mg), Aluminum (AI), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (CI, Argon, (Ar)
Define periodic table.
All identified chemical elements are arranged in rows (referred to as periods) and columns (referred to as groups) in the periodic table of chemical elements, also known as the periodic table, in ascending order of atomic number.
Period 3 elements have a tendency toward being hard (APART FROM Group 1), glossy, and having a metallic shine. They are also solids at room temperature and pressure (apart from mercury, which is a liquid metal), and they are good electrical conductors.
All elements in period 2 experience a decrease in atomic radius, an increase in electronegativity, and an increase in ionization energy as their atomic number rises. Only two metals (lithium and beryllium) are present in Period 2, which is fewer than any other period in terms of both quantity and proportion.
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15.0 l of an ideal gas at 298.0 k and 3.36 bar are heated to 350.0 k with a new pressure of 5.00 bar. what is the new volume in litres?
In accordance with the posed question, the new volume is 10.44 L.
What makes it a "ideal gas"?The phrase "ideal gas" describes a fictitious gas made up of molecules that adhere to the following principles: No attraction or repellence exists between the molecules of ideal gases. The sole interaction between molecules of an ideal gas would be an elastic impact when they collided or an athletic collision with the container walls.
Given data
Initial pressure (P₁): 3.36 bar
Initial volume (V₁): 15.0 L
Initial temperature (T₁): 298 K
Final pressure (P₂): 5.00 atm
Final volume (V₂): ?
Final temperature (T₂): 350 K
Step 2: Convert P₁ to atm
We will use the conversion factor 1 atm = 1.01325 bar.
3.36 bar × (1 atm / 1.01325 bar) = 3.32 atm
Step 3: Calculate V₂
We will use the combined gas law.
P₁ × V₁/T₁ = P₂ × V₂/T₂
V2 = P1 V1 T2/T1 P2
V₂ = 3.32 atm × 15.0 L × 350 K/298 K × 4.40 atm
V₂ = 10.44 L
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How do I balance this equation counting atoms S + O₂->SO3
1 times 2 that will give us 2 and then the oxygen since we need to have 6 we can put a 3 right here is the coefficient. 2 times 3 that equals 6. And we're done this equation is balanced the trick
What is a equation example?In its simplest form in algebra, the definition of an equation is a mathematical statement that shows that two mathematical expressions are equal. For instance, 3x + 5 = 14 is an equation, in which 3x + 5 and 14 are two expressions separated by an 'equal' sign.
What is a simple equation?A mathematical equation which represents the relationship of two expressions on either side of the sign. It mostly has one variable and equal to symbol.
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The mixture of oil and water is an example of ___.
A. a saturated solution
B. two miscible
C. two immiscible
D. a supersaturated solution
Answer:
C. two immiscibleExplanation:
if it helps pls like or comment b thanks youCalculate the mole fraction of benzene in a solution containing 30% by mass in carbon tetrachlooride
Answer:
To calculate the mole fraction of benzene in a solution containing 30% by mass benzene, you will need to know the molar mass of benzene and the mass of the solution.
First, calculate the mass of the benzene in the solution. If the solution is 30% by mass benzene, then the mass of the benzene is 30% of the total mass of the solution. Let's say the mass of the solution is 100 grams. The mass of the benzene in the solution would be 100 g * 30% = 30 g.
Next, calculate the moles of benzene in the solution. You can use the following formula to do this:
Moles = Mass / Molar mass
The molar mass of benzene is 78.11 g/mol, so the number of moles of benzene in the solution is:
Moles = 30 g / 78.11 g/mol = 0.385 moles
To calculate the mole fraction of benzene, you will need to divide the number of moles of benzene by the total number of moles in the solution. To find the total number of moles, you will need to convert the mass of the carbon tetrachloride to moles using the molar mass of carbon tetrachloride. Let's say the mass of the carbon tetrachloride is 70 g. The number of moles of carbon tetrachloride in the solution is:
Moles = 70 g / 153.82 g/mol = 0.455 moles
The total number of moles in the solution is the sum of the moles of benzene and the moles of carbon tetrachloride:
Total moles = 0.385 moles + 0.455 moles = 0.840 moles
To find the mole fraction of benzene, divide the number of moles of benzene by the total number of moles:
Mole fraction of benzene = 0.385 moles / 0.840 moles = 0.457
This means that the mole fraction of benzene in the solution is approximately 45.7%.
Explanation:
The answer is 0.461
step by step explanation:
Let the mass of solution be 100 gm
Mass of Benzene =30 gm
Mass of CCl4 =70 gm
Moles of Benzene =
30/78=0.385
Moles of Ccl4=
70/154=0.45 moles
Mole fraction (Benzene) =
0.385/0.385+0.45
=0.461
What volume of 0.0400 M calcium hydroxide is required to neutralize 32.50 mL of 0.0500 M nitric acid
The volume of 0.0400 M of calcium hydroxide is required to neutralize the 32.50 mL of the 0.0500 M nitric acid is 20.3 mL
The reaction is given as :
Ca(OH)₂ + 2HNO₃ ---> Ca(NO₃) + 2H₂O
molarity of the nitric acid = 0.0500 M
volume of the nitric acid = 32.50 mL = 0.0325 L
moles of nitric acid = molarity × volume
= 0.0500 × 0.0325
= 0.001625 mol
moles of calcium hydroxide = 0.001625 / 2 = 0.0008125 mol
volume of calcium hydroxide = moles / molarity
= 0.0008125 / 0.0400
= 0.0203 L = 20.3 mL
Thus, volume of the calcium hydroxide is 20.3 mL.
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HELP
Can someone explain what this is and what it means?
These are energy levels in an atoms. There are four energy levels - s, p, d, f in an atom.
The majority of an atom's mass is made up of electrons, which move in set orbits around the nucleus. They are not permitted to move freely or modify their random positions as they orbit the Earth. This is as a result of their particular level of energy.
Therefore, the fixed distance between an atom's nucleus and its electrons is known as its energy level. They go by the name "electron shells" as well. The initial few-electron shells are L, M, and N.
If the necessary energy is there, it will force the electrons to absorb it and move from the lower level of energy to the higher level.
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what mass of naoh must be added to enough water to make 1.50 l of solution having ph of 12.80?
Explanation:
a branch of technology that are less than 100nanometerlong
four aluminum samples are each reacted with separate 1m copper sulfate solutions under the same conditions of temperature and pressure. which aluminum sample would react most rapidly
Four aluminum samples are each reacted with separate 1m copper sulfate solutions under the same conditions of temperature and pressure.So all aluminum sample will react with same rate.
The following factors affect rate of reaction.
concentration of reactants, Pressure, Temperature, Catalyst, Nature of reactants, exposure of reacting species, Surface area, Intensity of light.
If all sample of aluminum are reacted with copper sulfate solution under same conditions, then all samples will react with same rate.
In general, adding the attention of a reactant in result, adding the face area of a solid reactant, and adding the temperature of the response system will all increase the rate of a response. A response can also be sped up by adding a catalyst to the response admixture.
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All of the following are homogeneous mixtures except A. hydrogen gas and chlorine gas.
B. sodium chloride and potassium chloride.
C. mercury-zinc solution.
OD. hydrochloric acid solution.
E. sodium chloride and potassium chloride solution.
Answer:C I think it is C
Explanation:
zn(s)+pb(no3)2(aq)→zn(no3)2(aq)+pb(s) net ionic equation
Given reaction
Zn(s)+Pb(NO3)2(aq)→Pb(s)+Zn(NO3)2(aq)Zn(s)+Pb(NO3)2(aq)→Pb(s ) +Zn(NO3 )2(aq)
The equilibrium net ionic equation is
Zn(s)+Pb(aq)2+→Pb(s)+Zn(aq)2 +Zn (s) +Pb(aq )2+ →Pb(s) +Zn(aq)2+
During the reaction,
Zn(s) is oxidized to the reducing agent and
Pb(NO3) 2(aq) is reduced to the oxidizing agent. Become.
The balanced half-reactions of oxidation and reduction are: half-reaction)
Pb(aq)2++2e−→Pb(s)Pb(aq)2+ +2e−→Pb(s) (reduction half-reaction)
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Beryllium can be extracted from beryllium chloride. Beryllium chloride is heated with potassium to produce beryllium and potassium chloride. Complete the equation for the reaction
The complete chemical equation of the chemical reaction in which Beryllium chloride is heated with potassium to produce beryllium and potassium chloride is as follows:
BeCl₂ + 2 K ---> Be + 2 KClWhat is a chemical equation?Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.
Chemical equations use the symbols of the elements, ions, or compounds that are involved in the reaction to represent the reaction.
The given reaction describes how Beryllium can be extracted from beryllium chloride.
The chemical reaction is as follows: Beryllium chloride is heated with potassium to produce beryllium and potassium chloride.
The chemical equation of the reaction is as follows:
BeCl₂ + 2 K ---> Be + 2 KCl
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Please Help Quick ASAP Hurry Chemistry Unit 4 Review Sheet
3. Refer to the equation below of the reaction of Nitrogen with hydrogen. If 16.7 grams of Nitrogen react, then:
N2(g) + 3H2(g) → 2NH3(g)
a. How many moles of NH3 are produced?
Work:
Ans:__________
Thank you I'm from K12 online School
Taking into account the reaction stoichiometry, an amount of 1.193 moles of NH₃ are produced.
Reaction stoichiometryIn first place, the balanced reaction is:
N₂ + 3 H₂→ 2 NH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the amounts of moles of each compound that participate in the reaction is:
N₂: 1 moleH₂: 3 molesNH₃: 2 molesThe molar mass of the compounds is:
N₂: 28 g/moleH₂: 2 g/moleNH₃: 17 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
N₂: 1 mole ×28 g/mole= 28 gramsH₂: 3 moles ×2 g/mole= 6 gramsNH₃: 2 moles ×17 g/mole= 34 gramsMass of NH₃ formedThe following rule of three can be applied: if by reaction stoichiometry 28 grams of N₂ form 2 moles of NH₃, 16.7 grams of N₂ form how many moles of NH₃?
moles of NH₃= (16.7 grams of N₂× 2 moles of NH₃)÷ 28 grams of N₂
moles of NH₃= 1.193 moles
Finally, 1.193 moles of NH₃ are formed.
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Which of the following is broken when water evaporates?
O Nonpolar Covalent bonds
O Hydrogen bonds
O Polar Covalent bonds
O lonic bonds
For water to evaporate, the hydrogen bonds inside it must be broken. These bonds are formed when the highly electronegative oxygen atom in water interacts with the more electroneutral hydrogen atom in water.
Since hydrogen bonds must be broken for water molecules to fly off as gas, a lot of heat is needed to raise the temperature of liquid water, and the same is true to evaporate the same amount of water. Hydrogen bonds are weak due to the fact that they are ionic interactions between molecules with unequal charges. Heat absorption causes hydrogen bonds to be broken, allowing water molecules to move about uninhibited. Hydrogen bonds develop in water at lower temperatures, releasing substantial energy.
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Q: Predict the product, if any, of reaction between methyl propanoate and Li(Ph)2Cu in ether.
* Draw only the product derived from the acyl portion of methyl propanoate.
* You do not have to consider stereochemistry.
* If no reaction occurs, draw the organic starting material.
The product of the reaction between methyl propanoate and Li(Ph)2Cu in ether would be ethyl propanoate.
The acyl portion of methyl propanoate (the methyl group attached to the carbonyl) would be replaced by an ethyl group. The reaction mechanism would involve the deprotonation of the carboxylic acid followed by the nucleophilic addition of the carbanion to the carbonyl group. Finally, the intermediate compound will go through a deprotonation step, releasing the ethyl propanoate and regenerating the Li(Ph)2Cu reagent. The product of the reaction between methyl propanoate and Li(Ph)2Cu in ether would be ethyl propanoate. The acyl portion of methyl propanoate (the methyl group attached to the carbonyl) would be replaced by an ethyl group.
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Which choice explains why
ionic compounds do not
conduct electricity in the
solid phase?
A. Solid ionic compounds do conduct electricity and the question is
false.
B. The electrons are shared equally between the metal and non-
metal atoms.
C. The electrons are transferred from the metal to the non-metal
atom.
D. The electrons are trapped in the crystal lattice structure and
cannot move.
Answer:
D. The electrons are trapped in the crystal lattice structure and cannot move.
Explanation:
Ionic compounds are compounds that consist of positive and negative ions that are held together by the electrostatic forces of attraction. In the solid phase, these ions are arranged in a regular, repeating pattern known as a crystal lattice. The ions are held in place by the electrostatic forces of attraction, and the electrons are trapped within the crystal lattice structure. Because the ions and electrons are unable to move freely, ionic compounds do not conduct electricity in the solid phase.
Draw structural formulas for each of the following:
A) 3-methyl-2-butanol
B) 2-fluoro-3-methyl-3-pentanol
The structural formula,3-methyl-2-butanol is [tex]C_5H_{12}O[/tex]
Structural formulas 2-fluoro-3-methyl-3-pentanol [tex]C_6H_{11}FO[/tex]
3-methyl-2-butanolThe chemical molecule known as sec-isoamyl alcohol and designated by the IUPAC as 3-methyl-2-butanol, Structural formula [tex]C_5H_{12}O[/tex]. It is employed in the production of other compounds as an intermediary and a solvent.
A more stable carbocation can be created by rearranging the intermediate carbocation that is created when an alkene receives a proton. We are not shocked to find that rearrangement substitution product exist as SN1-mediated substitution reactions generate carbocation intermediates.
For instance, when 2-Bromo-3-methyl butane reacts with water, it undergoes an SN1 reaction and produces 2-methyl-2-butanol rather than the intended result, 3-methyl-2-butanol.
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