according to the band theory as applied to metallic bonding, what set of these statements is true? i) the bonds between neighboring metal atoms can be described as localized electron pair bonds ii) the valence electrons of representative metals are free to move within the solid leading to thermal conductivity iii) the electrical conductivity of metallic solids decreases with increasing temperature
Answers
The valence electrons of representative metals are free to move within the solid leading to thermal conductivity. The correct answer is option ii).
According to the band theory, valence electrons in metallic solids are delocalized and form a "sea" of mobile electrons that can move freely throughout the solid. This delocalization of electrons is responsible for the high thermal conductivity exhibited by metals, as the mobile electrons can transfer thermal energy efficiently. Statement (i) is false because metallic bonds are not localized electron pair bonds. Statement (iii) is also false since the electrical conductivity of metallic solids generally increases with increasing temperature due to enhanced electron mobility. Hence The correct answer is option ii).
To know more about band theory, here
brainly.com/question/14414252
#SPJ4
Related Questions
How much heat must be removed from 357 g of water at 76.9C in order to cool it down to 18.1C?
Answers
Answer:
58.8C of heat
Explanation:
76.9C is the current heat temperature, to decrease it to 18.1C we have to subtract the both and later find our answer
Balance the following chemical equation by adding in Coefficients to the blanks
___Al2(SO4)3 +___ZnCl -->___AlCl3+ZnSO4
Answers
Answer:
Explanation:
The sum of the coefficients is 1 + 3+ 2+ 3 = 9
Answer:
There is no answer. This equation is unbalancable.
Explanation:
The numbers for Al always throw off the entire equation!
the tendency of a mineral to break and produce smooth, curving, shell-shaped surfaces is termed:
Answers
The tendency of a mineral to break and produce smooth, curving, shell-shaped surfaces is termed "conchoidal fracture." This characteristic is observed in certain minerals due to their specific atomic structure and bonding patterns. Minerals with this property exhibit a predictable breakage pattern, creating distinctive curving surfaces that resemble the shape of a seashell or a conch.
Conchoidal fracture is commonly seen in minerals with strong covalent or ionic bonds, such as quartz and obsidian. These minerals lack distinct cleavage planes, so when they break, they tend to form these smooth, curved surfaces. The absence of cleavage planes is a result of the uniform distribution of bonds throughout the mineral, which causes them to fracture in a more random manner, creating the curving shape.
In summary, the term "conchoidal fracture" refers to the tendency of a mineral to break and produce smooth, curving, shell-shaped surfaces. This property is observed in minerals with strong covalent or ionic bonds and a lack of distinct cleavage planes, such as quartz and obsidian. The unique breakage pattern is due to the uniform distribution of bonds within the mineral's structure, resulting in a random, curved fracture pattern.
Learn more about Conchoidal fracture here: brainly.com/question/30444209
#SPJ11
deduce the structure of an unknown compound using the data. molecular formula: c10h12o2 ir: 1690 cm−1, 1612 cm−1 nmr: ???? 1.4 (3h, t, ????
Answers
1) Molecular Formula: C10H12O2
The molecular formula provides information about the number and types of atoms present in the compound. In this case, the compound contains 10 carbon atoms, 12 hydrogen atoms, and 2 oxygen atoms.
2) Infrared (IR) Spectroscopy:
IR spectroscopy is used to identify functional groups present in a compound based on the absorption of infrared radiation. The given IR peaks are at 1690 cm^−1 and 1612 cm^−1.
The peak at 1690 cm^−1 suggests the presence of a carbonyl group (C=O) in the compound. This absorption is typically observed for aldehydes, ketones, and carboxylic acids.
The peak at 1612 cm^−1 could indicate the presence of an aromatic ring or an alkene functional group. However, without additional information, it's challenging to definitively assign this peak.
3) Nuclear Magnetic Resonance (NMR):
The NMR data is incomplete, as the chemical shift (δ) and coupling constant (J) values are missing. The information provided is "1.4 (3H, t, ????)."
The chemical shift value is necessary to determine the type of proton environment, while the coupling constant provides information about neighboring protons and the connectivity in the molecule.
Overall, based on the given information, we can deduce that the compound has a molecular formula of C10H12O2 and likely contains a carbonyl group (C=O).
Learn more about molecular formula here : brainly.com/question/29435366
#SPJ11
what is upthrust? name the factor that affect the upthrust.
Answers
The upthrust keeps a ship afloat. The upthrust keeps swimmers on top of the water. Things weigh less in water.
The upward force exerted on a body by the fluid in which the body is submerged is called the upthrust or buoyant force. The property of liquid to exert an upward force on a body immersed in it is called buoyancy. Being a force upthrust is measured in newton or kgf in the system of international units. Examples Pushing an empty can into water experiences the buoyant force. Pushing a cork into water into water experiences the buoyant force. Reason for Upthrust The thrust ating on on the sides of walls of the body get neutralised because they are equal in magnitude and opposite in the directions. There is a pressure difference between the lower and upper faces of block. Since force is the product of pressure and area, The difference in pressure due to liquid is on th two faces of causes a net upward force called upthrust on the body immersed in the fluid.
Answer: upthrust an upward force exerted by a fluid that opposes the weight of an immersed object.It is the force that pushes an object up. ... the upward force that a liquid or gas exerts on a body floating in it.
When a body is placed in water, Up thrust = V x d x g
From the above formula we can say that the following are the factors that affect up thrust:
Acceleration due to gravity - (g)
Density of the liquid - (d)
Volume of the body submerged in the liquid - (V), or volume of the liquid displaced (v)
Explanation:
describe the essential practical details for the preparation of
pure magnesium chloride
Answers
Start with high-quality chemicals: Ensure that the magnesium oxide or magnesium hydroxide and hydrochloric acid used in the reaction are of high purity and quality.
Prepare the reaction mixture: Add a calculated amount of magnesium oxide or magnesium hydroxide to the hydrochloric acid in a reaction vessel. The reaction is exothermic, so it is important to add the magnesium oxide or magnesium hydroxide slowly to avoid overheating.
Stir the mixture: The reaction mixture should be stirred continuously using a magnetic stirrer to ensure uniform mixing and prevent the formation of lumps.
Heat the mixture: The reaction mixture should be heated using a heating mantle or hot plate to speed up the reaction. The temperature should be maintained below 100°C to prevent the formation of magnesium oxychloride.
Monitor the progress of the reaction: The reaction is complete when all the magnesium oxide or magnesium hydroxide has dissolved, and the solution is clear.
Filter the solution: The solution is then filtered to remove any insoluble impurities or byproducts.
Concentrate and crystallize the solution: The solution is concentrated by evaporation to increase the concentration of magnesium chloride. The solution is then allowed to cool slowly to room temperature to allow the formation of pure magnesium chloride crystals.
Dry and store the magnesium chloride: The crystals are then filtered, washed with cold water, and dried in an oven. The pure magnesium chloride can then be stored in airtight containers for future use.
Overall, the preparation of pure magnesium chloride involves careful attention to detail, including the use of high-quality chemicals, controlled heating and stirring, and monitoring the progress of the reaction to ensure the production of high-quality crystals.
Manganese(IV) sulfate
O Mn(SO4)2
O MnSO4
O MgSO4
DONE
Answers
Answer:
A
Explanation:
give reason unit of volume is a derived unit
Answers
Answer:
A derived unit is defined as the unit that is created from a product of SI base units. Volume is an example of derived unit because it is not possible to measure volume directly using any measuring device For eg., Volume of water in bucket is can not be measured using rule, or scale, or any other measuring device.
Hence, volume is a derived unit.
Drag each tile to the correct image.
Match each alkane name with its structure.
octane
decane
propane
butane
heptane
CHE
IGH
CHE
Reset
Next
Answers
Answer:
The first one is Propane
The second one is HEPTANE
The third one is octane
The 4th is butane
the 5th is decane
The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.
The following structures has been given as:
The structure has 3 carbon atoms with the presence of 8 hydrogen. The molecular formula has been \(\rm C_3H_8\). It has been the structure of propane.The structure has 7 carbon and 16 hydrogen. The structure has been the representation of heptane with molecular formula \(\rm C_7H_{16}\).The structure has molecular formula \(\rm C_8H_{18}\) with 8 carbon and 18 hydrogen. It has been named Octane, according to IUPAC.The structure with 4 carbon and 10 hydrogen with molecular formula \(\rm C_4H_{10}\) has been named according to IUPAC as butane.The structure with molecular formula \(\rm C_{10}H_{22}\) has presence of 10 carbon and 22 hydrogen. It has been named as Decane.The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
For more information about structure of hydrocarbons, refer to the link:
https://brainly.com/question/8049265
What is the percent composition of sulfur in H2SO4?
2.1%
B)
65.2%
C)
98.1%
D)
32.7%
Answers
Answer:
D (32.7%)
Explanation:
Answer:D (32.7%)
Explanation:
An example of decomposer??
Answers
An example of decomposer
fungi and bacteria
both the main examples
Drag the handle on the left and adjust the length of the box to 5 nm. (Because no other dimensions of the box change, its length can be used as a substitute for volume. ) Pump the pump handle once fully. This should add 40 to 50 gas molecules to the container. The pressure gauge will fluctuate a little bit, so watch it for a minute to estimate an average value. Record the pressure in the table.
In the Constant Parameter menu, select Temperature. Then drag the handle of the box to change its length to each of the other values in the data table. Record the pressure for each length
Answers
Gay-Law Lussac's explains how the molecules are related to one another. According to the legislation, the relationship between system's absolute temperature and pressure has always been direct.
The pressure rises as a result of gas molecule collisions. The system's pressure was between 7.2 and 8.2 atm as the temperature rose. The system's pressure ranged from 3.6 to 4.1 atm as the temperature dropped. Gay-Law Lussac's explains how the molecules are related to one another. The ideal gas equation for gaseous molecules provides the link between temperature and pressure. The temperature and the temperature have been directly proportionated. When a result, as pressure has increased, so has temperature and vice versa. The energy that raises temperature has been released as a result of the gas molecules' contact with the wall. The temperature rising reflects the pressure rise.
Learn more about Gas molecule collisions here:
https://brainly.com/question/18689977
#SPJ4
how many moles of silver, ag, can be formed from 91.8 moles of calcium, ca, and 41.2 moles of silver nitrate, agno3?
Answers
The moles of Ag formed from 91.8 moles of calcium and 41.2 moles of silver nitrate. The balanced formula: Ca(NO3)2 + 2AgCl = 2AgNO3 + CaCl2.
In the balanced equation, the reaction between 2 moles of AgNO3 and CaCl2 yields 2 moles of AgCl.
AgNO3 and AgCl have a molar ratio of 1:1.
The amount of AgCl generated is 18 moles if there are 18 moles of AgNO3 for the reaction with CaCl2.
In this case 41.2 moles of silver nitrate will give,
41.2 ×2
= 82.4 moles of Ag
In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample.
For more information on moles kindly visit to
https://brainly.com/question/20486415
#SPJ4
when placed at the same temperature, compare the entropy of 10 mole of ar(g) at 10.0 atm and 10 mole of ar(g) at 0.5 atm. which system has a higher entropy? group of answer choices 10 mole of ar(g) at 10.0 atm 10 mole of ar(g) at 0.5 atm there is not enough information. they are the same in entropy.
Answers
When placed at the same temperature, the entropy of 10 mole of Ar(g) at 10.0 atm and the 10 mole of Ar(g) at 0.5 atm. The system has a higher entropy is 10 mole of Ar(g) at 0.5 atm.
The entropy is the measure the randomness of the of the system. the measure of the system's thermal energy per unit the temperature that is not available for doing the useful work.
The Entropy will increases with temperature at the constant pressure. The pressure increases leads to the higher degree of the order in the molecular arrangement. so, the entropy decreases with the increasing pressure.
To learn more about entropy here
https://brainly.com/question/13999732
#SPJ4
The driver of an 1,840 kg race car applies the brake to come to a complete stop. If the car
accelerates at -3.4 m/s2 what is the net force acting on the race car?
a) -541 N
b) 630 N
c) -1.8 N
d) -6,256 N
Answers
Push and pull subjected to an object is called force and is given in newtons. The net force acting on the race car is -6,256 N.
What is force?Force is the product of the mass of the object in kg and the acceleration in meters per second square. It is given by the formula:
\(\rm F = m \times a\)
Given,
Mass of the race car = 1,840 kg
Acceleration of the race car = -3.4
Substituting values in the above equation:
\(\begin{aligned} \rm F &= \rm m \times a \\\\&= 1840 \times -3.4\\\\&= -6,256 \;\rm N \end{aligned}\)
Therefore, option D. -6,256 N is the force acting on the car.
Learn more about force here:
https://brainly.com/question/16085992
explain why adding a slight excess of hydrochloric acid insures more complete precipitation of the group a cations, but a large excess should not be used.
Answers
When a large excess of hydrochloric acid is used, the complex formed may dissolve in excess of the HCL acid.
What is the reaction of hydrochloric acid with cations?The addition of hydrochloric acid causes precipitation of group 1 cation as milky white suspension.
The precipitates can be separated by gravity filtration, but more effective separation can be achieved by subjecting the suspension to centrifuge in a test tube.
So when adding a slight excess of hydrochloric acid, it insures more complete precipitation of the group a cations, such as group 1 cations.
The examples of group 1 cations include;
Silver ion (Ag⁺)lead (Pb²⁺)mercury (Hg²⁺)Thus, when a large excess of hydrochloric acid is used, the complex formed may dissolve in excess of the HCL acid.
Learn more about test for cations here: https://brainly.com/question/25414393
#SPJ4
Which best explains how fiber-optic technology benefits the field of medicine?
O It allows doctors to view internal body structures to help them diagnose illnesses.
O It helps surgeons make more accurate repairs to broken blood vessels.
O It allows doctors to magnify cells so they can identify unhealthy cells that cause cancer.
O It helps surgeons make cuts that are smaller and less painful than traditional methods.
Answers
Answer:
A. It allows doctors to view internal body structures to help them diagnose illness.
Explanation:
The statement, that describes fiber-optic technology benefits the field of medicine is "it allows doctors to view internal body structures to help them diagnose illnesses."
What is fiber-optic technology?Fiber optics is a technology that transmits information as light pulses across great distances using strands of glass or plastic fibre. Fiber-optic cables use light pulses that travel quickly to convey data.
Internal organs and tissue can be viewed through bodily orifices because to the flexible yet hard multi-fibers. Endoscopes are used by doctors to explore symptoms such as nausea and gastrointestinal pain, confirm diagnosis through biopsies, and provide medical therapy.
Medical fibre optics are an important medical technology that is employed in a variety of medical professions. They are chemically inert, sterile, malleable, and non-toxic to the human body. Fiber optic technology enables surgeons to repair organs, diagnose joint problems, and remove sick tissues, resulting in a faster recovery period for the patient than more intrusive surgical approaches.
Hence the correct answer is it allows doctors to view internal body structures to help them diagnose illnesses.
Learn more about fiber-optic technology here
https://brainly.com/question/10062531
#SPJ2
when the [nadph]/[nadp ] ratio in plants is high, photophosphorylation is primarily cyclic. what is/are the major product(s) of photophosphorylation in this circumstance
Answers
when the [nadph]/[nadp ] ratio in plants is high, photophosphorylation is primarily cyclic. c) ATP is/are the major product(s) of photophosphorylation in this circumstance .
The oxygenic photophosphorylation process, which is essential to photosynthesis, is the reason why electrons do not return to the photosystems. The method by which plants obtain their energy is called photosynthesis. This process comprises a number of stages in order to convert light energy into the sugar and ATP chemical energy that plants require to exist. The oxygenic photophosphorylation step is one of many significant and difficult processes used in this process. One of the fundamental mechanisms of photosynthesis is oxygenic photophosphorylation. It uses photosystems one and three, which are found in the thylakoid membrane of plant cells, to generate NADPH and ATP.
when the [nadph]/[nadp ] ratio in plants is high, photophosphorylation is primarily cyclic. what is/are the major product(s) of photophosphorylation in this circumstance
A) NADPH
B) ATP and NADPH
C) ATP
D) O2 and NADPH
E) oxygen (O2)
Learn more about photophosphorylation here:
https://brainly.com/question/25193635
#SPJ4
a noncovalent interaction between two molecules is known as
Answers
A non-covalent interactions between molecules are van der Waal's forces and hydrogen bonds.
What are non-covalent interactions?
Non-covalent interaction is an interaction which does not involve sharing of electrons and in this aspect it differs from covalent bond.It rather involves dispersed variations of electromagnetic interactions which are present between the molecules or within the molecule.
The energy released during the formation of these interactions is of the order of 1-5 kcal .They are classified as electrostatic, pi effects , van der waals forces and hydrophobic effects.
They are important in maintaining the three dimensional structure of large molecules such as proteins ,nucleic acids ,etc.They are also involved in biological processes . They heavily influence drug design process and design of materials.
Learn more about non-covalent interactions,here:
https://brainly.com/question/10736477
#SPJ2
which extinguishment method involves foam creating a barrier between the fuel gases and any possible ignition sources?
Answers
The extinguishment method is Smothering
What is smothering?The technique of smothering involves denying the fire the oxygen it needs to continue burning. Applying fire extinguishing products that block the chemical chain reaction at the molecular level is called interference. Restricting oxygen by keeping air from reaching the fire's center so that the combustion process can lower the amount of oxygen in the enclosed space until the fire extinguishes itself. The foam smothers the flames by covering the fuel surface. The foam covering keeps the fuel surface and the flames/ignition source apart. Foam cools the fuel as well as any nearby metal surfaces. The foam blanket prevents combustible vapors from escaping and mixing with the air. Foam (Class A and B) extinguishes fires in solids and liquids, but not in gases.
The extinguishment method involves foam creating a barrier between the fuel gases and any possible ignition sources is smothering.
To know more about smothering visit the link below,
https://brainly.com/question/1302988
#SPJ4
The average density of human blood is 1060 kg/m². What is the mass of blood in a person who has a
blood volume of 0. 00443 m3? Report your answer in units of kilograms and in units of pounds.
Answers
The mass of blood in a person is approximately 10.31 pounds. The mass of blood in a person can be calculated by multiplying the blood volume by the average density of human blood.
Given that the blood volume is 0.00443 m³ and the average density is 1060 kg/m³, we can find the mass as follows:
Mass = Volume x Density
Mass = 0.00443 m³ x 1060 kg/m³
Mass = 4.6858 kg
Therefore, the mass of blood in a person is approximately 4.6858 kilograms.
To find the mass of blood, we need to multiply the blood volume by the average density of human blood. The blood volume is given as 0.00443 m³. The average density of human blood is 1060 kg/m³. By multiplying these values together, we get the mass of blood in kilograms.
In this case, the mass of blood is approximately 4.6858 kilograms.
To convert this mass to pounds, we can use the conversion factor that 1 kilogram is equal to 2.20462 pounds. By multiplying the mass in kilograms by this conversion factor, we can find the mass in pounds.
Learn more about human blood: https://brainly.com/question/29414596
#SPJ11
The normal boiling and freezing points of argon are 87.3 K and 84.0 K. The triple point is at 82.7 K and 0.68 atmosphere. Use the data above to draw a phase diagram for argon. In the diagram, label the spots where the solid, liquid, and gas phases are stable as well as show the position of the normal boiling point.
Answers
INFORMATION:
We know that:
- The normal boiling and freezing points of argon are 87.3 K and 84.0 K
- The triple point is at 82.7 K and 0.68 atmosphere.
And we must draw a phase diagram for argon using the data
STEP BY STEP EXPLANATION:
To draw the diagram, we must graph first the triple point since it is the common point for the three states of the argon
Then, we need to use that the normal boiling and freezing points of argon are 87.3 K and 84.0 K to divide he states of the argon in the graph
Finally, we need to show the position of the normal boiling point
So, we obtain the next graph
ANSWER:
L is the midpoint of VC
LV = 9 find VC
Answers
Answer:
VC = 18
Explanation:
Since L is the midpoint and you have LV, you know that LC is also 9.
a sample of pure fe2o3 contains 14.8 g of oxygen atoms. calculate the total grams of fe2o3. the molar mass of fe2o3 is 159.69 g/mol.
Answers
The total grams of Fe2O3 are 49.2 g Fe2O3.
What is gramme?
The gramme is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogramme. It was originally known as the gramme.
The inorganic substance with the formula Fe2O3 is known as iron(III) oxide or ferric oxide. It is one of the three primary oxides of iron, the other two being the rare iron(II) oxide (FeO) and the naturally occurring iron(II,III) oxide (Fe3O4) found in the mineral magnetite. The primary iron source for the steel industry is Fe2O3, which is the mineral hematite. Acids easily penetrate Fe2O3. Rust is frequently referred to as Iron(III) oxide, and to some extent this term is helpful because of the similarities in composition and a number of its features; nevertheless, in chemistry, rust is a poorly defined substance that is defined as Hydrous ferric oxide.
? g Fe2O3 = 14.8 g O ×1 mol O/15.9994 g O×1 mol Fe2O3/3 mol O×159.69 g Fe2O3/1 mol Fe2O3
= 49.2 g Fe2O3
To learn more about ferric oxide https://brainly.com/question/14611617
#SPJ4
Which is a general representation of a secondary amine? An N is bonded to two electron dots above; with a dotted triangular line to an H, a solid triangular line to an H, and single line to an H; it is noted that the angle between the last 2 H atoms is 107 degrees. An N with 2 electron dots is linked to an R 1 group with a single line, an H with a triangular line, and and H with a dotted line. An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and and H with a dotted line. An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and an R 3 with a dotted line.
Answers
Answer:
B is wrong the answer is C on edge
Explanation:
!need actual answers 7 questions need help !!!!! take your time!! will check soon this is my homework practice please check my screenshot for the a,b,c and d answer choices. just a bit out of it today to do them thanks... :)
1 How many moles of Boron is 1.25 x 10²³ atoms of Boron?
2 How many moles of Al is 4.21 x 10²⁴ atoms of Al? *
3 How many moles of Ar is 2.53 x 10²⁴ atoms of Ar
4 How many moles is 2.80 x 10²⁴ atoms of Hydrogen?
5 How many atoms are in 3.69 moles of Na?
6 How many atoms are in 3.69 moles of Na?
7 How many atoms are in 8.27 x 10⁻⁶ moles of Co?
Answers
Answer:
1. 0.207 moles
2. 6.99 moles
3. 4.20 moles
4. 4.65 moles
5. 2.221 × 10²⁴ atoms
6. 2.221 × 10²⁴ atoms
7. 4.979 × 10^18 atoms
Explanation:
The number of moles and atoms can be calculated using the Avagadro's number, which is 6.02 × 10^23 atoms.
mole = number of atoms ÷ Avagadro's number.
1. Mole = 1.25 x 10²³ ÷ 6.02 × 10^23
mole of Boron = 0.207 × 10(23-23)
= 0.207 × 10^0
= 0.207 moles
2. Mole = 4.21 x 10²⁴ ÷ 6.02 × 10^23
mole of Aluminum = 0.699 × 10(24-23)
= 0.699 × 10^1
= 6.99 moles
3. Mole = 2.53 x 10²⁴ ÷ 6.02 × 10^23
mole of Argon = 0.420 × 10(24-23)
= 0.420 × 10^1
= 4.20moles
4. Mole = 2.80 x 10²⁴ ÷ 6.02 × 10^23
mole of Hydrogen = 0.465 × 10(24-23)
= 0.465 × 10^1
= 4.65 moles
5. Number of atoms of Na = 3.69 × 6.02 × 10²³
= 22.21 × 10²³
= 2.221 × 10²⁴ atoms
6. Number of atoms of Na = 3.69 × 6.02 × 10²³
= 22.21 × 10²³
= 2.221 × 10²⁴ atoms
7. Number of atoms of Co = 8.27 x 10⁻⁶ moles × 6.02 × 10²³ atoms
= 49.79 × 10^17
= 4.979 × 10^18 atoms
What would happen if we didn't have mercury (the element)
Answers
Which particle is NOT made up of quarks?
A: a proton
B: a neutron
C: an electron
Answers
Answer: C: an electron
Explanation:
Answer:
C: electrons
Explanation:
3. Given the following equation: CH4(g) + 2 O2(g) > CO2(g) + 2 H2O(l) AH = -890.4 kJ a. How much energy is given off when 5.00 moles of CH4 are burned? And How much energy is released when 85.6 grams of CH4 are burned?
Answers
Answer:
-4452 kJ is given off from 5.00 moles of CH4.
-4763.64 kJ is given off from 85.6 grams of CH4.
Explanation:
First, let's write the equation:
\(CH_4+2O_2\rightarrow CO_2+2H_2O,\text{ }\Delta H=-890.4\text{ kJ.}\)a. We want to know how much energy is given off when 5.00 moles of CH4 are burned, so if we 'multiply' all the coefficients by 5.00 moles, the enthalpy change (ΔH) will also be multiplied by 5.00, so we're going to have:
\(\Delta H\cdot5=-890.4\text{ kJ}\cdot5=-4452\text{ kJ.}\)-4452 kJ is given off from 5.00 moles of CH4.
Now, to find how much energy is released when 85.6 g of CH4 are burned, we have to find the number of moles using the molar mass of CH4 which is 16 g/mol (you can calculate the molar mass of a compound using the periodic table). The conversion will look like this:
\(85.6\text{ g CH}_4\cdot\frac{1\text{ mol CH}_4}{16\text{ g CH}_4}=5.35\text{ moles CH}_4.\)We have 5.35 moles of CH4, so we have to follow the same steps that we did before:
\(\Delta H\cdot5.35=-890.4k\text{ kJ}\cdot5.35=-4763.64\text{ kJ.}\)-4763.64 kJ is given off from 85.6 grams of CH4.
according to molecular orbital theory, where is the charge of the allyl carbocation below associated?
Answers
The delocalization energy as the difference between the total energy of the π electrons and the energies of the individual π bonds: an electron in one π bond has the energy of α+β.
MO theory and Resonance
- in MO theory, the entire molecule is treated as one entity, and all of the electrons in the entire molecule occupy regions of space called molecular orbitals.
- Two electrons are placed in each orbital, starting with the lowest energy orbital, until all electrons occupy orbitals.
- According to MO theory, the three p orbitals no longer exist. Instead, they have been replaced by three MOs, in order of increasing energy. Notice that the lowest energy MO, called the bonding molecular orbital, has no vertical nodes. The next higher energy MO, called the nonbonding molecular orbital, has one vertical node. The highest energy MO, called the antibonding molecular orbital, has two vertical nodes.
- The π electrons of the allyl system will fill these MOs, starting with the lowest energy MO.The allyl carbocation has only two π electrons, rather than three, because one of the carbon atoms bears a positive formal charge indicating that one electron is missing. The two π electrons of the allyl system will occupy the lowest energy MO (the bonding MO). If the missing electron were to return, it would occupy the next higher energy MO, which is the nonbonding MO. Focus your attention on the nonbonding MO.
There should be an electron occupying this nonbonding MO, but the electron is missing. Therefore, the colored lobes are empty and represent regions of space that are electron deficient. In conclusion, MO theory suggests that the positive charge of the allyl carbocation is associated with the two ends of the system, rather than just one end.
To know more about Resonance :-
brainly.com/question/29547999
#SPJ4