Based on the thermodynamic calculations, the boiling point of hydrogen peroxide was determined to be 418.69 K.
The liquid's boiling point can be given as :
Boiling point =ΔH / ΔS
The table below lists the enthalpy and entropy values for both liquid and gaseous hydrogen peroxide.
The following is the value of the change in enthalpy ( ΔH ) for boiling hydrogen peroxide:
ΔH = ΔH(gas) - ΔH(liquid)
ΔH = - 136.3 - ( - 187.8 )
ΔH = - 136.3 + 187.8
ΔH = 51.5 KJ/mol
The following is the value of the change in entropy ( ΔS ) for boiling hydrogen peroxide:
ΔS = ΔS(gas) - ΔS(liquid)
ΔS = 233 - 110
ΔS = 123 J/mol.K
The formula for hydrogen peroxide's boiling point is:
Boiling point = [tex]\frac{ 51500 J/mol}{ 123 J/mol.K}[/tex]
Boiling point = 418.69 K
Based on the thermodynamic calculations, the boiling point of hydrogen peroxide was determined to be 418.69 K.
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how much water remains unfrozen after 50.2 kj is transferred as heat from 260 g of liquid water initially at its freezing point?
109 g of water remains unfrozen after transferring 50.2 kj of heat from 260 g of liquid water.
What is freezing point?A liquid turns into a solid at the freezing point. Increased pressure typically causes the freezing point to rise, just like it does for the melting point. Combinations and some organic substances, such as fats, have a freezing point that is lower than their melting points.Every substance has a freezing point, which is the point at which it changes from a liquid to a solid. Since the liquids can be rapidly chilled below their freezing points, they don't solidify until temperatures considerably below freezing.Here given ,
The volume of frozen water is m.
m = LFQ
= 333 kJ/kg x 50.2 kJ
= 0.151 kg
= 151 g.
Consequently, the volume of water that is still liquid is :
260 g − 151 g
= 109 g.
Therefore 109 g of water remains unfrozen.
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after the reactions are complete, suppose you have found that the reaction with 2-fluoro-5-nitropyridine was faster than the reaction with 2-bromo-5-nitropyridine. what is the most likely explanation for this observation?
The intermediate is stabilised by fluorene electronegativity, which removes the electrons from the meisenheiner complex's negative charge, allowing the process to proceed more quickly.
What is fluorene ?The chemical molecule known as fluorene, also known as 9H-fluorene, has the formula (C6H4)2CH2. It produces white crystals with a distinctive, aromatic smell akin to naphthalene. Its name comes from the violet fluorescence it emits. It is made from coal tar for commercial use.Because the Meisenheiner complex, a tetrahedral-like intermediate with a negative charge on the nitrogen of the pyridine ring, is produced by the nucleophilic attack of the benzyl amine. By stabilising the intermediate and removing the electrons from the meisenheiner complex's negative charge, fluorene electronegativity speeds up the reaction.Fluorene can cause skin and eye irritation and burns. White crystalline plates make up fluorene. It serves as a chemical intermediary as well as being employed in resinous goods and colours. Because HHAG and EPA have mentioned fluorene, it is listed on the Hazardous Substance List.To learn more about fluorene refer :
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which of the following is a product of the light reactions of photosynthesis? view available hint(s)for part a which of the following is a product of the light reactions of photosynthesis? glyceraldehyde-3-phosphate high-energy photons water and co2 nadp and rubp oxygen, atp, and nadph
The calvin cycle uses ATP and NADPH, the byproducts of photosynthesis' light reactions.
What elements of the photosynthesis process are used in the Calvin cycle?
NADPH and ATP are the byproducts of the light reactions of photosynthesis that are used in the Calvin cycle. Sunlight raises the energy level of photosystem II electrons during the light reactions. As the electrons move along the electron transport chain, a gradient of hydrogen ions is produced.
Each produces a triose phosphate (C₃H₇O₆P) molecule after consuming one ATP and one NADPH molecule.
Therefore, the calvin cycle generates triose phosphates, of which one-sixth is used in pathways for the synthesis of carbohydrates and the remaining triose phosphates are retained and go through the regeneration phase.
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What are the advantages of I bonds?.
I bonds' primary advantage is that they shield your money's purchasing value from inflation. The amount that a dollar can buy decreases as prices rise throughout the economy. Does inflation remain high
what is An economy is exactly ?An economy is a system of related production and consumption activities that ultimately determine how resources are divided within a society. The entirety of the goods and services produced and consumed satisfies the needs of those who live and work there.
Exactly why is the economy important?Most of the following important life situations include economics: how policy is decided by the government. purchasing real estate prospects and monitoring the situation of the home market. being able to decide on a budget with knowledge
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Complete each nuclear fusion reaction. 226 88 ra → d e rn 4 2 he d: e: 238 92 u → f g th 4 2 he f: g:
D represents 222, E represents 86, F represents 234 and G represents 90.
These two chemical processes are an example of an alpha decay process. The process of heavier nuclei decaying into lighter nuclei and producing an alpha particle is known as alpha decay. The alpha particle also referred to as a helium nucleus, has a charge of +2 units.
[tex]\frac{A}Z} X=\frac{A-4}{Z-2} Y + \frac{4}{2} He[/tex]
The isotope that was created has an atomic mass that is 4 units less and an atomic number that is 2 units less.
In the chemical equations, then:
[tex]\frac{86}{226}Ra =\frac{84}{222} Rn + \frac{4}{2} He[/tex]
D stands for 222, and E for 86.
[tex]\frac{92}{238}U =\frac{90}{234}Rn + \frac{4}{2} He[/tex]
F represents 234 and G represents 90.
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How long is a TABC license valid in Texas?.
TABC declared your seller training certification will be valid for two years from the date of issue.
The Texas Alcoholic Beverage Commission, or TABC, is a state agency in Texas that regulates, inspects, and taxes the production, sale, and consumption of alcoholic beverages in the state. The agency was established in 1935 and is headquartered in Austin. TABC certification provides you with the knowledge and skills you need to avoid the most common alcohol service violations, as well as peace of mind for employers, knowing they are helping to keep Texans safe.
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in a gas mixture, the partial pressures are nitrogen 423 torr , oxygen 149 torr , and helium 255 torr . part a what is the total pressure, in torr, exerted by the gas mixture? express your answer to three significant figures and include the appropriate units
827.0 torr is the total pressure, in torr, exerted by the gas mixture
The partial pressures of the individual gases make up the total pressure of the gas mixture.
Total pressure= sum of all partial pressure
Total pressure=423+149+255
Total pressure= 827.0 torr
Pressure is defined as force/area. To illustrate the pressure from snow on a roof, divide the weight of the snow by the surface area of the roof. Gases are a typical pressure source in chemistry. A "vacuum" is used to describe the absence of pressure. Humans have long held the belief that vacuums are both improbably rare and unnatural because "nature abhors a vacuum." Actually, this is not the case.
The number of pressure units is ridiculous. It's common to use the torr or mmHg unit. This discussion is solely focused on the height of a mercury column. The atmosphere contains 760 torr, or mmHg. You might also look at mmH2O, which makes use of a related idea.
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suppose a current of .680 ma flows through a copper wire for minutes. calculate how many moles of electrons travel through the wire.be sure your answer has the correct unit symbol and the correct number of significant digits.
The wire is traversed by 1.27 10-2 moles of electrons. A copper wire experiences a 0.680 ma current flow for several minutes. The electron is a subatomic particle with a negative electric charge.
Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to be elementary particles.
The mole is a unit of measurement or the starting point for determining how much of a substance is present in a sample. A mole is the avagadro number of molecules.
q = i×t
The terms "charge," "current," and "time" are used here.
I = 680 mA 1 A / 1000 mA
I = 0.680 A
(60 sec. / 1 min.) = 30.0 minutes
t =1800 sec
q = I + t q = 0.680 A 1800 s q = 1224 A sec
q = 1224 Amp.sec
q = 1224 C ( coulomb = ampere × second)
Charge = moles of electrons × charge of an electron
Charge of an electron = 96500 C/mol of e-
1224 C = moles of electrons × 96500 C/mol of e-
Moles of electrons = 1224 C / (96500 C/mol of e-)
Moles of electrons = 1.27×10^-2 moles of e-
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A subunit of an organic compound that confers particular chemical and physical properties is termed.
A functional group, a subunit of an organic compound that confers particular chemical and physical properties is termed. Correct answer: letter C.
Since, functional groups are responsible for the formation of chemical bonds between molecules and atoms, and play an important role in the physical and chemical properties of the organic compounds of which they are a part.
Origin of functional groupsThe term ‘functional group’ was first coined in 1883 by German chemist Hermann Kolbe, and it is used to refer to a specific group of atoms within an organic compound that has a distinct chemical structure and identity.
Functional groups are often referred to as “active sites”, as they are the main sites of chemical activity within an organic compound.
Functional groups contain atoms that are held together by covalent bonds, which are strong chemical bonds that form when electrons are shared between atoms.
A subunit of an organic compound that confers particular chemical and physical properties is termed ________
A) A monomer.
B) An oligomer.
C) A functional group.
D) A synthetic unit.
E) An isomer.
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When performing a subcutaneous injection the needle tip is positioned?.
When performing a subcutaneous injection the needle tip is positioned at an angle of 45- to 90-degree.
What is Subcutaneous injection?This is referred to as a type of injection which is used to administer medications or drugs into the body through the fatty tissues which are present beneath the skin so as to ensure that the adequate treatment oif the diseased individual is achieved.
The angle is based on the amount of subcutaneous tissue present and they have an inverse relationship such that shorter needles are positioned at a 90-degree angle.
On the other hand, longer needles are positioned at a 45-degree angle which is therefore the reason why 45- to 90-degree was chosen as the correct positioning for the needle tip of a subcutaneous injection.
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ch4: which of these would not be an effective way to procure accurate and unbiased results from a fan intercept survey conducted during a sporting event?
These would not be an effective way to procure accurate and unbiased results from a fan intercept survey conducted during a sporting event, Ensure that those collecting surveys are attired in team gear.
In order to understand populations as a whole, surveys are a means of collecting data from a sample of people using pertinent questions. Everyone involved in the information economy, including corporations, the media, governments, and academics, can benefit from surveys' data and insights. Four different surveying techniques are frequently employed.
Personal interviews
Call-based polls
Paper questionnaires that participants fill out themselves
computerized self-administered polls (typically online)
There are several elements that all surveys have in common, despite the fact that survey methods differ greatly. Survey methodologists, psychologists, statisticians, and many other researchers have thoroughly examined several of these characteristics data.
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What are the two main classes in conflict according to Marx?.
The dynamic between the capitalists, or "bourgeoisie," and the working class, or "proletariat," as Marx terms them.
A definition of conflict, for instance.A persistent disagreement between parties with fundamentally different principles or opinions: He frequently disagreed with his father. The policy caused numerous disagreements inside the party as a result of how unpopular it was. Because of his strong ideas, he and the president frequently had disagreements.
What conflicts a story in what ways?In literature, these problems are referred to as conflicts. Conflict is a better word to describe frustrated, endangered, or competing desire. In essence, it happens when a character strives to achieve a goal but is hampered by outside factors. The character can have a want that is unattainable.
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what is the vapor pressure of a solution prepared by dissolving 0.750 moles of c6h12o6 in 5.50 moles of water at 25oc? the vapor pressure of water at 25oc is 23.8 mmhg.
The ratio of partial pressure of the solute to the total pressure will be equal to its mole fraction by which, the partial pressure obtained for C₆H₁₂O₆ is 3.24 mmHg.
What is partial pressure ?Partial pressure of a component in a mixture is the pressure contributed by the component to the total pressure of the mixture. Thus, the partial pressure of a solute contributes to the total pressure in solution.
The mole fraction of a component A in a mixture containing A and B is equal to the ratio of the its partial pressure to the total pressure.
nA / (nA + nB) = pA / pA + pB.
Let pA be the partial pressure of C₆H₁₂O₆ and partial pressure of water is given 23.8 mmHg, then pA is calculated as :
0.750 /(5.50 + 0.750 ) = pA / (pA + 23.8 mmHg)
0.12 = pA / (pA + 23.8 mmHg)
pA = 0.12 pA + 2.856
pA = 3.22 mmHg.
Therefore, the partial pressure of C₆H₁₂O₆ is 3.22 mmHg.
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what mass of cu(s) is electroplated by running 11.0 a of current through a cu2 (aq) solution for 4.00 h ?
The mass of copper that is electroplated by running 11.0 A of current is calculated to be 52.11 g
The reaction for electroplating, in this case, can be given as;
[tex]Cu^{2+} + 2e^{-} --- > Cu[/tex]
As the current, I = 11 A and the time given is 4 hours, we first convert the time into seconds as follows;
t = 4 hours = 4 × 60 × 60 = 14400 seconds
We know that, F = Faraday constant = 96485.33 C/mol and
Molar mass of copper = 63.546 g/mol
Now we determine the charge by using the following formula;
Q = I × t
Q = 11 × 14400
Q = 158,400 C
Moles of electrons can be calculated as follows;
Q/F = 158400 ÷ 96485.33 = 1.64 moles
Now moles of copper can be calculated as follows;
1/2 × Q/F = 1/2 × 1.64 = 0.82 moles
Now the mass of copper can be determined as follows;
Moles × Molar mass of copper = 0.82 × 63.546
Mass of copper = 52.11 g
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the substance oxidized causes the other substance to be reduced and is called the: group of answer choices reducing agent oxidizing agent private agent the oxidizer
The oxidised substance reduces the other substance and is known as reducing agent.
what is reducing agent ?
A reducing agent is a chemical species that "donates" an electrons to an electron receiver (called the oxidising agent, oxidant, oxidizer, or electron acceptor). Earth metals, formic acid, oxalic acid, and sulfite compounds are examples of common reducing agents.
Reducers contain additional electrons in their pre-reaction states (that is, they are themselves reduced), whereas oxidizers lack electrons (that is, they are by themselves oxidized). This is often stated in terms of their oxidation states. The oxidation state of an agent specifies the degree of electron loss, with the higher the oxidation state having fewer electrons.
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What happens on an atomic level when a reaction between two elements such as sodium and chlorine results in two oppositely charged ions?.
The sodium atom loses an electron to the chlorine atom. The sodium atom becomes positive ion. The chlorine atom then becomes the negative chloride ion.
On an atomic level when the reaction takes place between two elements such as sodium and the chlorine result in two oppositely charged ions is they combine to form the an ionic compound, sodium loses its one electron to chlorine so chlorine gains the one electron.
A white, crystal-like ionic compound called the sodium chloride (NaCl) is used to flavor the food.
It is composed of a chloride anion (Cl-) and a sodium cation (Na+).
Due to the fact that it is made up of two substances with distinct electronegativities, it is categorized as an ionic compound.
It forms a chloride ion and forms the ionic compound sodium chloride.
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7. When one thing in a circuit stops working, the whole circuit stops working. O parallel O series
When one component of a circuit in series stops, the entire circuit also comes to an end.
A series circuit will be disrupted and no longer allow electricity to flow if one component is taken out or disconnected. Take a series circuit made up of a number of Christmas tree lights as an illustration. The power cannot pass through to the next bulb if one of the bulbs breaks.All components in a parallel circuit connect to the same electrical nodes. Since all parallel components share the same voltage, the overall current is equal to the sum of all the branch currents.
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when the equation above is balanced and all coefficients are reduced to lowest whole-number terms, what is the coefficient for h3po4(l) ?
The following equation can be balanced by multiplying the appropriate integers on either side:
Ca₃(Po₄)₂ + 4H₃PO₄ ⇒ 3Ca(H₂PO₄)₂
In a balanced chemical equation describing a reaction, all of the reactants and products are represented in precise stoichiometric ratios, where the amounts of each element must match on both sides.
The example that is given serves as a combo reaction example. The phosphate group can be balanced by multiplying by 4 with H3PO4, and the number of calcium in the product side of the equation can be balanced by multiplying by 3.
As a result, the balanced chemical equation above has 6 phosphate groups, 3 calcium ions, and an equal number of hydrogens on each side. H3PO4 has a coefficient of 4.
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if photons of light with a wavelength of 189.1 nm illuminate the surface of a metal, what will the kinetic energy of the electron be, in j? (note: this question depends on your answer to part 1. your final answer to this question must be submitted after you've submitted your final answer to part 1)
The kinetic energy of the electron be, in j is 4.1766 × 10⁴⁹.
Kinetic energy is the power an object has because of its motion. If we want to boost up an object, then we must follow a force. making use of force requires us to do paintings. After work has been accomplished, energy has been transferred to the object, and the object might be moving with a new consistent speed.
Calculation:-
wavelength = 189.1 nm
= 189.1 × 10⁻⁹ m
c = λf
f = 189.1 × 10⁻⁹ m / 3 × 10⁸
= 63.033 × ⁻ ¹⁷
kinetic energy = hf
= 6.626 × 10⁻³⁴ × 63.033 × ⁻ ¹⁷
= 417.66 × 10⁻⁵¹
= 4.1766 × 10⁴⁹
The kinetic energy of an item is the electricity that it possesses because of its motion. it is defined because the work needed to boost up a frame of a given mass from relaxation to its stated pace. Having gained this energy for the duration of its acceleration, the frame maintains this kinetic electricity except for its pace changes.
Potential energy saved energy that relies upon the relative position of numerous components of a gadget. A spring has greater potential energy when it is compressed or stretched. A steel ball has extra capability strength raised above the ground than it has after falling to Earth.
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what noble-gas configurations and charge are the following elements likely to attain in reactions in which they form ions?
If the elements achieve following ions then they are likely to attain noble-gas configurations. The example of the elements attaining ionic forms are given below:
[Ne], N³⁻
[Ar], Ca²⁺
[Ar], S²⁻
[Kr], Br⁻
The noble gas configuration refers to the symbol of last Nobel gas and the configuration of the remaining electrons of atom preceding that particular Nobel gas. According to Nobel gas configuration, if an atom has 8 electrons inside the valence shell then it becomes most stable atom.
All noble gases have the eight electrons inside their outermost shells making them most stable and inert elements of periodic table.
For example, the Neon symbol refers to standard Nobel gas configuration thus making noble gas configuration for sodium [Ne]3s¹
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Your question is incomplete, for the full question please refer below:
what noble-gas configurations and the charge are the following elements likely to attain in the reactions in which they form ions?
N³⁻
Ca²⁺
S²⁻
Br⁻
How the properties of a compound and the properties of its component compare
The properties of compounds are different from the properties of the elements that form them because elements in a compound combine and become an entirely different substance with its own unique properties.
What are compounds?A compound is described as a material formed by chemically bonding two or more chemical elements.
When elements combine in a any specific ratio, compounds are formed. These compounds are totally different from the elements that compose them.
As these elements combine to form compounds, the individual properties of the combining elements are no longer observed. Only the properties of the compound formed is now observed.
In conclusion, we can say that the physical properties of any compound are often quite different to the physical properties of the elements that made them up.
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What are user-defined details about a file that describe its content and origin called?.
Document properties are user-defined details about a file that describe its content and origin.
They are also called metadata because they are data that describe other data for structure and organization. These details commonly refer to the title, the author or editor's name, the subject, and those keywords that give identity to the document's content.
There are four types of Document Properties, and with the help of Microsoft, we can list them:
- Standard properties: refer to details such as author, title, and subject
- Automatically updated properties: these are defined automatically and refer to file system properties, including the file size and dates of creation or modification. Also, involve statistics properties such as the number of characters or words in a file.
- Custom properties: are additional details that the user can define, like the numeric value o text time.
- Document library properties: indicate the properties of the document in a public website or folder
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for which properties can a student design an investigation of the electrostatic forces between molecules in a substance?
The melting point, boiling point, surface tension, and vapor pressure of a substance are the properties that a student can use to design an investigation of the electrostatic forces between molecules.
What is melting?The method that will help you measure the melting point temperature of ice is to mix ice and water until equilibrium is reached, but some ice is left that is still melting.When atoms, molecules, or ions are close to one another, there may be intermolecular forces that work to repel or attract them.For the measurement to be accurate, the melting point's modest heating rate is crucial.When ice is heated, its temperature frequently increases, but once it begins to melt, the temperature remains constant.It is common for the temperature of ice to rise when it is heated, but once the ice begins to melt, the temperature remains constant until all of it has melted.To Learn more about melting point refer to:
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Answer:
1. melting point, boiling point, surface tension and vapor pressure
2. deciding on the appropriate equipment
3. it ensures that results are accurate
4. the students should take the average of the results from all four trials
5. surface tension
Explanation:
electrical bonding investigation evidence quick check
a sample of a gas has a volume of 30.0 ml at a pressure of 6.50 psi. determine the volume of the gas in milliliters at a pressure of 11.0 psi.
Therefore the volume of the gas at a pressure of 11.0 psi is 30.0 milliliters.
What is volume of the gas?The volume of a system is a crucial comprehensive parameter for defining its thermodynamic state in thermodynamics. The specific volume, a strong characteristic, is the volume of the system per unit of mass. The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas. It is identified as a "V." The amount of 3-dimensional space a gas occupies is referred to as its volume. The volume of a gas inside a closed container will match the volume of the container.
How to calculate the volume of a gas?At ambient temperature and atmospheric pressure, one mole of any gas occupies a space of 24 dm3. Given the number of moles of any gas we have, we can use this to compute its volume as follows: Molecule volume equals 24 dm3/mole.
Briefing:A sample of helium has a 325 mL volume & a 655 mmHg pressure.
y = -28.873 (30.0) + 1539.3 (30.0) = 673.1 mmHg
673.1 mmHg for x = 30.0 mL.
As a result, the pressure is 673.1 mmHg Q4 when the gas volume is 30.0 mL.
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if the central atom in a molecule is sp3 hybridized, how many different electronic geometries can it have?
Tetrahedral molecular geometry is the only one that can exist for sp3 hybridized center atoms.
Which chemical contains an sp3 hybridized central atom?An atom that is bound and a nonponding pair of electrons are the two different kinds of electron domains.All bonded atoms count as one electron domain on the center atom, regardless of whether they are connected by a single, double, or triple bond.There are five fundamental geometries for electron domains. The core oxygen atom in the water molecule has six valence electrons.The 6 valence electrons of oxygen are arranged in hybridized sp3 orbitals, resulting in 2 paired and 2 free electrons.One s orbital and three p orbitals combine to generate four sp3 orbitals, each of which has a 25% s character and a 75% p character. This process is known as sp3 hybridization.An example of CO2 can be used to illustrate how lone pairs of electrons make up an SP3 hybrid orbital.We are only able to count bond pairs or lone bonds.To learn more about sp3 refer
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determine whether each change represents oxidation or reduction. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. oxidation reduction
The change represents oxidation or reduction are :
CH₃CH₂OH to CH₃CH₃ = reductionCu to Cu²⁺ = oxidation NO₃⁻ to NO₂⁻ = reduction2Ag⁺ to 2Ag = reductionFe³⁺ to Fe²⁺ = reductionC₆H₁₂O₆ to CO₂ = oxidationThe removal of hydrogen is oxidation and increases in oxidation number is called as the oxidation reaction. the oxidations are given as :
Cu to Cu²⁺ = oxidationC₆H₁₂O₆ to CO₂ = oxidationThe removal of oxygen is called as reduction and the decrease in oxidation number is called as the reduction. the reductions are given as follows :
CH₃CH₂OH to CH₃CH₃ = reductionNO₃⁻ to NO₂⁻ = reduction2Ag⁺ to 2Ag = reductionFe³⁺ to Fe²⁺ = reductionTo learn more about oxidation or reduction here
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If there was a high concentration of acetylcholine within the synaptic cleft, but little to no response at the motor end-plate, you would expect ________________ to be the responsible neuromuscular-blocking agent.
curare
If there was a high concentration of acetylcholine within the synaptic cleft, but little to no response at the motor end-plate, you would expect curare to be the responsible neuromuscular-blocking agent.
Curare is a paralyzing agent that causes weakness in the skeletal muscles. When taken in a sufficient dose, it can also cause death by asphyxiation because the diaphragm is paralyzed. Curare poisoning can be indicated by paralysis. It doesn't tend to alter the state of consciousness, but since every voluntarily controlled muscle in the body is paralyzed, the person suffering from curare poisoning can't confirm their consciousness. From the outside, curare poisoning looks very similar to the locked-in syndrome.
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five pellets of a metal have a total mass of 1.25 g and a total volume of 0.278 ml. what is the density of the metal? show your work.
A metal has a value of 1.25 g overall, a density = 0.348 g/mL, and a volume of 4.5 g mL in five pellets.
What is density and example?Depending on its density, "stuff" can occupy a certain amount of space. For instance, there are more people in just about any piece of harder, light element silver than there are in any block of the heaviest element lead. Styrofoam blocks are not as dense as bricks. Mass per unit of area serves as its definition.
What is density and how is it measured?To calculate the density of an item or substance, use the following formula: Each meter cubed equals a kilogram of concentration when the volume is divided by the mass (p = m/v).
Briefing:In the above equation,
density=mass/volume
where,
m=1.25g
v=0.278ml
therefore,
= 1.25/0.278
=4.5gmL
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consider the titration of 10.00 ml of a monoprotic weak acid with 0.1234 m naoh. if the equivalence point volume of naoh was determined to be 15.4 ml, what is the initial concentration of the unknown acid? group of answer choices 0.0951 m 0.248 m 0.190 m 1.90 m 2.48 m
The initial concentration of the unknown acid is 1.9 M.
Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.
Calculation:-
C₁ =
V₁ = 10.00 ml = 0.01 L
C₂ = 0.1234 M
V₂ = 15.4 ml = 0.0154 L
C₁ = C₂V₂/V₁
= 0.1234 M × 0.0154 / 0.01
= 1.9 M
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.
The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
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according to dr. al-khalili, why were scientists interested in atomic theory in the mid nineteenth century?
Scientists interested in atomic theory in the mid nineteenth century because of steam.
The scientific theory known as "atomic theory" states that atoms are the basic building blocks of matter. Atomism, a prehistoric intellectual movement, is where the atomic hypothesis had its start. This notion held that if a lump of stuff were divided into ever-smaller parts, one would ultimately reach a point where the smaller components could not be divided any further. These fictitious fundamental elements of substance were given the Greek term atomos, which means "uncut," by the ancient thinkers.
John Dalton, a chemist, observed that, in the early 1800s, chemical compounds appeared to mix and decompose into other substances in weight proportions that suggested that each chemical element is ultimately composed of minute, indivisible particles of constant weight.
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