The same atoms make up tautomers, which are isomers with various electrical and molecular configurations. The associated tautomeric form is the most reliable.
Describe tautomery.
Tautomery is a specific type of isomery caused by a shift in one or more atoms' positions inside the molecule. The molecule electronic distribution and, consequently, the molecular structure are altered by this shift in location.
Tautomerization, the constant interconversion, is what gives equilibrium to the isomeres known as tautomers in solution. The same kind and number of atoms are present in both molecules.
The item in the suggested example has the chemical formula C10H16O3. In isomeric molecules, 6C, 16H, and 3O are essential. The distribution of these atoms, however, fluctuates, changing the structure of the resultant molecule.
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in one experiment, 23.91 ml of the 0.1403-m ce4 solution is required to react completely with 20.00 ml of the fe2 solution. calculate the concentration of the fe2 solution.
The concentration of the Fe²⁺ solution in the experiment is 0.16772 M.
Here, we provide two solutions together with their volume and concentration.
Accordingly, the formula for calculating concentration is
M₁V₁ = M₂V₂
let M₁ = Fe²⁺'s molarity
V₁ = the volume of Fe²⁺
M₂ = Ce⁴⁺'s molarity
V₂ = the volume of Ce⁴⁺
now,
M₁ X 20 = 0.1403 x 23.91
M₁ = 0.1403 X 23.91 / 20
M₁ = O.16772
Hence, the concentration of Fe²⁺ is 0.16772 M.
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In general, a lone pair repels bonding electron pairs _____ than bonding pairs repel each other. A lone pair will therefore _____ the bond angle between bonding pairs. A double bond has a similar effect because a double bond has a _____ electron density than a single bond.
Bonding electron pairs tend to reject one another more than single electron pairs do. As a result, a loan pair will make the bond angle between bonding pairs smaller. Because a double bond has a higher electron density than a single bond, it has a comparable result.
When referring to a pair of valence electrons that are not shared by another atom in a covalent connection, a lone pair is also referred to as an unshared pair or a non-bonding pair. The outerm0st electron shell of an atom is where lone pairs are discovered. With the use of a Lewis structure, they can be located. As a result, when two electrons are coupled but aren't utilized in chemical bonding, they are referred to as lone pairs. The total number of valence electrons surrounding an atom is therefore equal to the sum of the number of lone pair electrons and the number of bond electrons.
In the VSEPR theory, which describes how molecules take on their various forms, the idea of a lone pair is used. Additionally, Lewis' chemistry makes reference to them.
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there are 20 common, naturally occuring amino acids. modify the given ompies of compund 1 to draw the stuctures of 2 and 3
Antimarkkorvnikov product is formed when HBr addition occurs to the double bond in the presence of photochemical conditions, and the products formed will be diastereomers.
In the addition reaction, step one is the homolytic cleavage of the HBr Bond which forms the H radical and Bromine radical also the alkene will form a bond with the bromine radical and forms a tertiary radical and then the tertiary radical forms a bond with hydrogen radical and forms the two products with different configurations and these products are Diastereomers since one product have S and R and another product has S S Configuration.
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the volume of a sample of hydrogen gas was decreased from 12.35 l12.35 l to 5.64 l5.64 l at constant temperature. if the final pressure exerted by the hydrogen gas sample was 5.00 atm,5.00 atm, what pressure did the hydrogen gas exert before its volume was decreased?
2.2834 atm of pressure is initially present before the volume of the gas was reduced.
Assuming the condition to be an ideal behavior, the gas sample should satisfy the Boyle's law, which states that
PV = constant when temperature is held constant.
It can be said that, the pressure the gas exerts is inversely related to the volume of the airtight container. Therefore,
P₁V₁ = P₂V₂
On rearranging,
P₁ = (P₂V₂)/V₁
We know that V₁ is 12.35L and V₂ is 5.64L P₂ is 5 atm. On substituting we get,
P₁ = (5x5.64)/12.35
P1₁ = 28.2/12.35
P₁ = 2.2834 atm
Therefore the initial pressure would be 2.2834 atm when the volume of the gas is reduced from 12.34L to 5.64L.
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) what are the maximum (peak) mixing ratios of ozone (o3), nitric oxide (no), and nitrogen dioxide (no2) during these eight days?
Nitrous oxide is destroyed in the stratosphere and removed from the atmosphere more slowly than methane, persisting for around 114 years.
Ozone, or trioxygen, is an inorganic molecule with the chemical formulation O ₃. it is a pale blue fuel with a distinctively pungent odor. it is an allotrope of oxygen that is a whole lot less solid than the diatomic allotrope O ₂, breaking down in the lower environment to O ₂.
Ozone can harm the tissues of the respiration tract, inflicting inflammation and inflammation, and result in signs together with coughing, chest tightness, and irritation of bronchial asthma signs. further, ozone reasons big damage to crops, forests, and native flora.
Ozone is an odorless, colorless gas made up of 3 oxygen molecules O3, and is a natural part of the surroundings. It occurs both within the Earth's upper surroundings, or stratosphere, and at a ground degree in the lower surroundings, or troposphere.
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Which of the following ionic compounds would be expected to have the highest lattice energy? A) KI B) KBr C) KCl D) KF
The strongest lattice KF
What is an lattice energy?
Lattice energy is the energy difference between the measured value of the ionic solid's energy and the expected experimental value. The energy difference between the energy of the ionic solid and the energy of the individual gaseous ions is what this is, more specifically.
What is an compound?
Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio
highest lattice --> small metal ion, small halide
so there is a strong ionic figure, i.e. ionic = very metal +very nonmetal
note that Fluorine is pretty electrongative
so choose F
then, since K is the same for all
the strongest lattice if KF
Therefore, option(D) is correct
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an element can be described as shiny, brittle, and a weak conductor of electricity. this element is most likely a
An element could be described as shiny, brittle, and weak conductor of electricity. This element is most likely a metal.
A metal could be a chemical element which includes iron; an alloy including stainless steel; or a molecular compound together with polymeric sulfur nitride. In physics, a metal is normally appeared as any substance capable of accomplishing power at a temperature of absolute 0.
They have got lusture and a steel appearance. They're commonly within the shape of a solid at room temperature. They're superb conductors of energy and heat. Metals are malleable and ductile. They are lustrous any shiny too.
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For a specific unknown sample of matter, the molecules are; moving fast, compressible, and can change their shape. Which of the following examples of matter is the identity of the unknown sample of matter?gaseous air
Gaseous air is the sample of matter whose molecules are moving fast, compressible, and can change their shape.
Matter exists in three different states: solid, liquid, and gas. Solids have a distinct volume and shape. Although they have a specific volume, liquids adopt the shape of the container. Gases lack a distinct volume or shape. The particles of gases are fast moving, compressible and can occupy the container in which they are put.
According to the kinetic molecular theory of gases, this state of matter is made up of microscopic particles that are constantly moving apart from one another and squabbling against the container's walls and one another. These collisions are elastic, meaning that there is no overall energy loss as a result of them. All gases have the same average kinetic energy when they are at the same temperature because the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.
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isopropyl alcohol is mixed with water to produce a 40.0% (v/v) alcohol solution. how many milliliters of each component are present in 635 ml of this solution? assume that volumes are additive.
In 635 mL of this solution, there are 365 mL of water and 270 mL of alcohol, respectively.
As the 40.0% (v/v) alcohol solution is provided to us. In other words, there is 40.0 mL of alcohol in 100 mL of solution.
The amount of alcohol in the 635 mL solution must now be calculated.
As 40.0 mL of alcohol are present in 100 mL of solution.
As a result, 635 mL of the solution include alcohol.
Alcohol therefore has a capacity of 270 mL.
We must now determine the water's volume.
Volume of water = Volume of solution - Volume of alcohol
Volume of water = 635 mL - 270 mL
Volume of water = 365 mL.
As a result, there are 365 mL of water and 270 mL of alcohol, respectively, in 635 mL of this solution.
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what is the answer i will give brainllest
Answer:
This is a single replacement reaction
Jordan adds 20 grams (g) of salt and 200 g of dry beans to a pot of warm water. Jordan made.
A polar solute will dissolve in a polar solvent, while a non-polar solute will dissolve in a non-polar solvent. Option C is the right choice as a result. That is the salt in the water dissolving in Jordan
And the beans settling to the bottom of the saucepan. Solutions are mixtures of two or more substances that are homogenous. A solution is a uniform mixing of molecules from the solvent and the solute. A material that is highly dissolved in a solution is called a solvent. A solute is a material that is present in a solution in small amounts. 200 g of dried beans are added to warm water along with 20 g of salt, which is then mixed and allowed to sit for 15 minutes observed by Jordan. The polar solute in the list is salt (sodium chloride).
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The complete question is-
Jordan adds 20 grams (g) of salt and 200 g of dry beans to a pot of warm water. He stirs the salt and bean into the water and then lets it sit for 15 minutes. What should Jordan expect to observe after those 15 minutes?
if the difference in electronegativity (δen) between two atoms is 0.2, how would the bond formed between those atoms be classified?
As the electronegativity difference between the two atoms is greater than 2.0 then it is considered as an ionic bond.
What is Ionic Bond?
When all one or more electrons are totally transferred from one atom to the other, the atoms assume their closest inert gas state and form a chemical bond.
To shed energy and become stable, two atoms can come together fundamentally in three different ways. They can give or receive electrons to complete their octet structure. It is known as an ionic bond or electrovalent bond when this kind of combination results in a bond. A link of this kind is created when one atom gains electrons from its outermost level or orbit while the other atom is depleting electrons.
When a shared pair of electrons is not distributed equally, a polar covalent bond is created. This is caused by the electronegativity difference between the two elements. Only when the difference in electronegativity between the two atoms is between 0.5 and 2.0 can this bond be created.
Given that there is an electronegativity difference of 2.4 between the two atoms, the link that has been created between them can be categorised as an ionic bond.
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a certain half-reaction has a standard reduction potential 0.07 v. an engineer proposes using this half-reaction at the anode of a galvanic cell that must provide at least of electrical power. the cell will operate under standard conditions. note for advanced students: assume the engineer requires this half-reaction to happen at the anode of the cell.
The cathode half cell will have no maximum reduction potential and the engineer can choose an appropriate cathode that will deliver atleast 0.13V or more power
What is a cathode ?
An electrical device with polarized current has a metallic electrode called a cathode through which current is discharged. The electrode in a polarized electrical device via which current enters from an external circuit is known as an cathode, on the other hand.
what is an half-reaction?
The portion of a larger reaction known as a half-reaction constitutes either an oxidation or a reduction on its own. For a redox reaction to be fully described, it requires two half-reactions, one oxidation and one reduction.
The given half cell will work as the anode of the galvanic cell. Oxidation occurs at the anode and the standard oxidation potential E0ox = -E0red. Therefore, the given half cell will have oxidation potential E0ox = -(-1.07 V) = +1.07 V.
The cell potential is given as E0cell = E0red + E0ox and the cell potential will have a value of atleast 1.20 V. Therefore, put E0cell = 1.20 V and get
E0red = E0cell – E0ox = (1.20 V) – (1.07 V) = 0.13 V.
If the cathode half cell has a reduction potential less than 0.13 V, then the cell potential of the galvanic cell will fall below 1.20 V. Hence, the cathode half cell must have a minimum standard reduction potential of +0.13 V
The cell is supposed to deliver atleast 1.20 V power. However, the cell can deliver more than 1.20 V power. Say, the cell delivers 1.30 V power. Then putting E0cell = 1.30 V, we have,
E0red = (1.30 V) – (1.07 V) = 0.23 V.
Hence, the cathode half cell will have no maximum reduction potential and the engineer can choose an appropriate cathode that will deliver atleast 0.13V or more power.
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rank the following compounds in order of increasing boiling point, putting the compound with the lowest boiling point first.
Taking the item with the lowest boiling point first. I II III arrange the following substances according to their rising boiling points.
The definition of a compound example.A material formed by the chemical fusion of two or more different components in science Water (H2O), which is produced from the elements hydrogen and oxygen, and table salt (NaCl), which is made from sodium and chloride, are two examples of compounds.
What are some examples of the eight organic compounds?Covalent bonds between carbon and hydrogen, as well as commonly additional atoms, are used to create organic compounds. Benzoic acid, diethyl malonate, propanoic, butanoic, and malonic acids are a few examples of organic compounds, along with aromatic and heterocyclic substances.
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Answer:
A: 4
B: 2
C: 3
D: 1
Explanation:
Calculate the numbers of neutrons there are in the following isotope use the periodic table to find atomic numbers.
Answer:
carbon - 14 number of neutron is 8Nitrogen -15 number of neutron is 8calcium -45 number of neutron is 25Iodine -131 number of neutron is 78Explanation:
number of neutron = mass number - atomic number
if four molecules of carbon dioxide enter the calvin cycle (four "turns" of the cycle), how many g3p molecules are produced and how many are exported?
If four molecules of carbon dioxide enter the Calvin cycle (four turns of the cycle), eight G3P molecules are produced and four G3P are exported.
Carbon dioxide molecule (CO₂) enters the Calvin cycle in the presence of RuBisCO enzyme and interacts with a five-carbon molecule named as ribulose-1,5-biphosphate(RuBP). This interaction creates two molecules of a three-carbon chemical named as 3-phosphoglyceric acid (3-PGA).
These 3-PGA molecules, with the help of ATP and NADPH(G3P) are transformed into a three-carbon sugar named as glyceraldehyde-3-phosphate.
One G3P molecule is utilized to create glucose molecule and the remaining G3P molecules are recycled which regenerates RuBP.
Thus, for every four turns of the Calvin cycle, eight G3P molecules are produced and four G3P molecules are exported.
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when is it important to wear safety goggles in the laboratory? group of answer choices when using liquid chemicals in the lab. when i start pouring or transferring chemicals at the lab bench. any time there are chemicals or laboratory equipment present in the lab. only when my lab ta tells me to. as soon as my lab partners put on their goggles. flag question: question 2
We should wear safety goggles in a chemical laboratory as a safety and protective measure.
When we use chemicals in the chemical lab and while pouring or transferring it, wearing a safety goggles is important in order to protect our vision from chemical splashes which is an important asset for anyone working in a laboratory. The irritating vapors and fumes released while performing an experiment can damage our eyes. Also, while performing experiments which are explosive in nature, our eyes are prone to its hazards. So, in such cases wearing a safety goggles which covers the eyes from all the sides can act as a protective shield.
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take stereochemistry into account and describe expected stereoisomers if any. of the following products, which will be formed as a racemic mixture. select all that apply
The solution comes with a list of the products that will be created by the chemical reaction in question.
We discover that allylic bromination occurs in this situation. On a benzylic/allylic carbon, it is the replacement of bromine for hydrogen. N-bromosuccinimide carries out this procedure (NBS for short). The double bond is followed by the bromine substitution (this is called the allylic position).
Depending on the symmetry of the alkene reactant, the products may differ. If a symmetric alkene reactant is used, just one product will be create. Due to the two separate allylic locations, a mixture of products is created in the case of an asymmetric alkene product .A copy of the question in its entirety is given
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what is the net ionic equation for the complete neutralization reaction between the strong acid hno3 (aq) and the strong base ba(oh)2 (aq)? what is the driving force for the reaction?
The net ionic equation for the complete neutralization reaction between the strong acid hno3 (aq) and the strong base ba(oh)2 (aq) is 2H+ +2OH- --->H2O(l) and the driving force for the reaction is formation of H2O(l)
The net ionic equation for the complete neutralisation reaction between strong acid HNO3(aq) and Ba(OH)2 (aq) is as follows;
Ba(OH)2(aq)+HNO3(aq)---Ba(NO3)2(aq)+2H2O(l)
Splitting into ions, we get
Ba2+ + 2OH- +H+ +NO3- --- Ba2+ +2NO3- +2H2O(l)
The net ionic equation is 2H+ +2OH- --->H2O(l)
The driving force of this reaction is equivalent of acids is reacting with equivalents of base and hence neutralisation reaction takes place.
The driving force for this neutralisation reaction is formation of H2O(l)
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Aseptic processing involves
a. quick freezing food after it is prepared.
b. drying foods to decrease water content.
c. sterilizing the package and food separately and then packaging the food.
d. the addition of chemical preservatives.
Aseptic process involves sterilizing the package and food separately and then packaging the food. So the option C is correct.
Aseptic process is a process which involves placing of a sterilized product into a sterilized package and then sealing the product under the sterilized conditions. It ensures that the product is without any bacteria. Many products degrade when gone through the harsh conditions of sterilization but aseptic processes allows the safe production of all those products.
Aseptic manufacturing requires constant environmental monitoring, specially trained and experienced workers to perform the operations, specialized equipment, and cleaning procedures. If the aseptic process is compromised, there is a serious risk to both the product and the patients.
Aseptic packaging is also a type of thermal sterilization. It is process in which commercially sterilized food item is placed in a sterilized package followed by sealing under aseptic environment. It is highly recommended for the preservation of tomato paste, and fruit juices. Heat treatment, chemical application, or both can be utilized for sterilization in this process. Paper and plastic are generally used in conventional aseptic packaging.
Basically, there are two approaches of aseptic packaging:
direct approachcomposed of steam infusion and steam injunction
indirect approachcomprises scrapped surface heat exchanger, plate heat exchanger, and tubular heat exchanger
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assume that in a cell the ratio(s) listed is/are high. which ratio(s) would lead to a decrease in the rate of entrance of acetyl coa into the citric acid cycle?
NADH/NAD+ ratio would lead to a decrease in the rate of entrance of acetyl coa into the citric acid cycle.
The Krebs cycle, often referred to as the TCA cycle (tricarboxylic acid cycle), and the citric acid cycle (CAC) are chemical processes that release stored energy through the oxidation of acetyl-CoA obtained from carbs, lipids, and proteins. Organisms that respire (as opposed to organisms that ferment) use the Krebs cycle to produce energy, either through anaerobic or aerobic respiration. The cycle additio0nally supplies the reducing agent NADH and precursors of a few amino a.cids that are needed in a variety of other processes. It may have developed abiogenically and was one of the earliest components of metabolism given its prominent role in numerous metabolic processes. [3] [4] Although it is advertised as a "cycle," metabolites need not adhere to it.
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how many grams of ni are formed from 58.5 g of ni2o3 ? 2ni2o3(s)⟶4ni(s) 3o2(g) step 1: show the strategy for solving this problem.
The grams of ni are formed from 58.5 g of ni2o3 is 41.2 g.
The mole, mol, is the unit of amount of substance inside the global gadget of units. the amount quantity of the substance is a degree of how many fundamental entities of a given substance are in an object or pattern. The mole is described as containing precisely 6.02214076×10²³ primary entities.
Calculation:-
2ni2o3(s)⟶4ni(s)
The molar mass of 2ni2o3 = 2(2×57 + 3 × 16)
= 324 g
324 g of ni2o3 produces 228 g of Ni
Therefore, 58.5 g of ni2o3 will produce = 228 / 324 × 58.5
= 41.2 g
All chemistry is pervaded with the aid of the mole definition. on account that most quantitative chemical calculations are centered on the mole, for the have a look at chemistry, the expertise of the mole is vital. Information of how the mole applies to mass, a variety of entities.
Mole is defined as the amount of the substance containing an equally wide variety of discrete entities (atoms, molecules, ions, etc) as there are atoms in a pattern of natural 12C weighing precisely 12g. The wide variety of particles present in one mole of any substance =Avogadro variety=6.
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The carbon and nitrogen cycles are related to one another because:
Please choose the correct answer from the following choices, and then select the submit answer button.
- both are required to make the primary biological molecules (carbohydrates, fats, proteins, and sugars).
- both are liberated into the environment when organisms decompose.
- microorganisms have important roles in the cycling of each.
- All of these choices are correct.
The carbon and nitrogen cycles are related to one another because:
d. All of these choices are correct.
Chemically, carbon is an element with the symbol C and atomic number 6. Carbon, which is categorized as a nonmetal, is a solid at ambient temperature.
Since it makes up around 78% of the air humans breathe, nitrogen is not poisonous. It does not have a smell, yet it is not safe. chemical that can suffocate a person to death or render them unconscious. Oxygen in the air is replaced by simple aphyxiants like nitrogen.
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which of the following is true of water in a base ionization reaction? select all that apply: water loses a proton and is acting as an acid. water loses a proton and is acting as a base. water accepts a proton and is acting as an acid. water accepts a proton and is acting as a base.
Water loses a proton and is acting as an acid is true of water in a base ionization reaction
Water will self-ionize to a very small extent under normal conditions. The reaction in which a water molecule donates one of its protons to a neighbouring water molecule, either in pure water or in an aqueous solution, is called the self-ionization of water.
In an autoionization process, one water molecule can react with another to form an OH– ion and an H3O+ ion:
2H2O(l) ⇆ H3O+(aq) + OH–(aq)
and, In aqueous solutions, H3O+ is the strongest acid and OH− is the strongest base that can exist in equilibrium with H2O.
What is Ionization?
Ionisation is defined as the process by which an atom or molecule gains or loses a positive or negative charge as a result of chemical changes. An ion is an electrically charged atom or molecule that results. If the ion has a negative charge, it is called an anion; if it has a positive charge, it is called a cation.
The basic ionisation reaction can be represented as follows:
M → M+ + e–
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Is the pH greater than, equal to, or less than 7 after the neutralization of each of the following pairs of acids and bases? -NH3 and HClO4 -NaOH and benzoic acid -KOH and HBr -(CH3)3N and HOBr
Any stron electrolyte can dissociate completely into its ions but for weak electrolyte only certain number of ions are dissociated so pH depends on the dissociated ions.
What is an acids and bases?
Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered to be an acid. Acidic chemicals are typically recognized by their sour flavor.
What is a ph?
an evaluation of how basic a substance or solution is. On a scale from 0 to 14, pH is measured. A pH value of 7 is considered neutral on this scale, which implies it is neither acidic nor basic. It is more acidic if the pH value is less than 7, and more basic if the pH value is greater than 7.
pH < 7 for NH3 and HCLO4 since the acid is strong acid and the base is weak base.
pH > 7 for NaOH and Benzoic acid since the base is strong base and acid is a weak acid .
pH = 7 for HBr anf KOH since both are strong acid and strong base
pH < 7 or pH > 7 since bith are weak acid and weak base.
Therefore, Any stron electrolyte can dissociate completely into its ions but for weak electrolyte only certain number of ions are dissociated so pH depends on the dissociated ions.
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calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from ????
The energy of a photon emitted when an electron in a hydrogen atom undergoes a transition is equal to the energy difference between the two energy levels involved.
This can be calculated using the equation:
Energy (in Joules) = hc/λ
where h is Planck's constant (6.626 x 10^-34 J·s), c is the speed of light (299,792,458 m/s), and λ is the wavelength of the photon (in meters).
What is a Photon?
A photon is a light particle that serves as the fundamental unit of all forms of electromagnetic radiation. Photons are massless and chargeless particles that travel at the speed of light. They carry the electromagnetic force and are responsible for the majority of the phenomena associated with light, such as visible light, radio waves, and X-rays.
Explain electron?
A subatomic particle with a negative electric charge is known as an electron. It is the most basic and smallest particle of matter. Electrons are found in every atom and are responsible for chemical bonds.
Explain hydrogen atom?
A hydrogen atom is the most fundamental type of atom. It is made up of a single proton and a single electron held together by the electromagnetic force. It is the simplest and most abundant type of atom in the universe.
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the molar mass of oxygen gas (o2) is 32.00 g/mol. the molar mass of c3h8 is 44.1 g/mol. what mass of o2, in grams, is required to completely react with 0.025 g c3h8? 0.018 grams 0.034 grams 0.045 grams 0.091 grams
The following is the reaction's balanced chemical equation:
C3H8 + 5O2 = 3CO2 + 4H2O ,
According to a molar ratio of 1:5, the number of moles of C3H8 that were involved in the reaction was 0.025 g / 44.1 g/mol = 0.000567 mol. The number of O2 moles needed is 5 times the number of C3H8 moles that were reacted, hence the number of O2 moles needed is 0.000567 x 5 = 0.00284 mol. The needed mass of O2 is 0.00284 mol times 32.00 g/mol, or 0.091 mol. response is 0.091 mol
In chemistry, what does a molar mass mean?A substance's molar mass is defined as its mass in grams per mole. As seen in this video, the molar masses of a substance's constituent atoms may be added to determine the substance's molar mass.
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when you are left with 6.25 mg of the radioactive isotope, how many minutes would have passed from time equals zero? (5 points) 1.0 minutes 3.0 minutes 6.0 minutes 12 minutes
3 minute would have passed from time equals zero
Calculation
The half-life of a radioisotope is the time it needs for the mass of the radioisotope to halve with respect to its original value.
In this problem, the initial mass of the radioisotope at t=0 is
m0 = 50.0 mg
We see that after t = 1 min, the mass of the isotope is
m(1 min) = 25.0 mg
so, exactly half the initial mass: this means that 1 minute is exactly the half-life of this radioisotope.
So, the amount of mass left after each minute is the following:
m (1 min ) = 25.0 mg (1 half-life)
m (2 min) = 12.5 mg (2 half-lives)
m (3 min) = 6.25 mg (3 half-lives)
so, when we are left with 6.25 mg of isotope, 3 minutes have passed, which means that 3 half-lives have passed.
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an atom of 117i has a mass of 116.913460 amu. calculate the mass defect in amu/atom. enter your answer with 4 significant figures and no units.use the masses: mass of 1h atom
∆ m ~ 1.056 The mass defect is the discrepancy between the nucleus of an atom's anticipated mass and its actual mass. This discrepancy is due to the binding energy of a system, which might manifest as excess mass.
Iodine 117 contains 64 neutrons and 53 protons altogether.
because of this, its theoretical mass
= 53*(proton mass) + 64* (mass of neutron)
= 53 * 1.007825 + 64 * 1.008665
= 117.969285 amu
The atomic mass unit is used to represent the atomic mass of an element (AMU or amu). The unified atomic mass unit (AMU), often known as the dalton (Da), represents both atomic masses and molecular masses (u).
Consequently, mass defect is defined as,
Theoretical mass divided by actual mass is m.
= 117.969285 - 116.913460
1.055825 amu for each atom
∆ m ~ 1.056
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the initial molarity of the cu2 and zn2 solution used in the setup of the electrochemical cell was 1 m. explain why the voltage was not equal to the standard cell potential for the cu/zn redox reaction at all times during the experiment.
Due to the shielding of the zinc s electrons by the electrons in filled d orbitals, the valence electrons in zinc in the Zn/Cu system have a significantly higher potential energy than the valence electrons in copper.
We can measure the standard electrode potential of the system Mg2+ | Mg by using a standard hydrogen electrode as an anode and a Mg2+ | Mg as a cathode. Standard hydrogen electrode: Pt(s), H2(g) (1 atm), H+ (aq), and magnesium wire electrode dipped in 1M MgSO4 solution.
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