Answer:
Can(HCO 3)2=CaCO +CO2 +H2O
Which of the following buffer systems would be the best choice to create a buffer with pH = 7.3?
HC2H3O2/KC2H3O2
HClO2/KClO2
NH3/NH4Cl
HClO/KClO
Answer:
HClO/KClO would be the best choice to create a buffer with pH=7.3
Explanation:
The HClO/KClO buffer system is a good choice to create a buffer with a pH of 7.3 because it is a relatively weak acid-base system with a pKa value close to 7.3.
A buffer is a solution that can resist changes in pH when small amounts of acid or base are added to it.
The HClO/KClO buffer system is based on the acid-base equilibrium of hypochlorous acid (HClO) and hypochlorite ion (ClO-). HClO is a weak acid and ClO- is its conjugate base. The pKa value of HClO is 7.5, which is close to the desired pH of 7.3. This means that at a pH of 7.3, the buffer will contain a relatively equal mixture of HClO and ClO-.
When an acid is added to the buffer, the HClO will react with it to form water and chloride ion, thus neutralizing the acid and maintaining the pH. Similarly, when a base is added to the buffer, the ClO- will react with it to form HClO and water, neutralizing the base and maintaining the pH.
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Does an endothermic absorb or release energy
Answer:
Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.
Explanation:
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What are the effects at the DNA level?
DNA damage can affect normal cell that affects function and impact the rates of apoptosis.
What are the negative effects on the DNA?DNA on the other hand damage to affects genetic material can consequence in impaired cellular function, cell loss, or the change of healthy cells to cancers. Factors such as light, temperature, and pollution could enduringly alter our DNA and gene expression, especially as climate change continues. Point mutations that occur in DNA order encoding proteins are either silent, missense or nonsense.
Extremely inaccurate DNA replication can lead to a rapid aggregation of mutations that disrupts cellular procedure and effects needed for viability and extinguish clonal populations of cells within some generations
So we can conclude that Each DNA strand is calm of nucleotides units made up of a sugar (deoxyribose).
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The figure represents three identical containers connected by valves that can be closed or opened to allow gas movement between the containers. At the beginning of a student's investigation, the valves are closed and the two outer containers are completely empty. The middle container holds particles of an ideal gas at a pressure of 9 atm. After the valves are opened and enough time has passed for net movement of particles between the containers to stop, the pressure of gas in the middle container will be closest to which of the following?
1.5 atm
2 atm
3 atm
9 atm
After valves are opened and enough time has passed for net movement of particles between containers to stop, pressure of gas in middle container will be closest to 3 atmospheres as pressure will be halved after opening valves.
What is pressure ?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
Pressure will be halved after opening valves as it will be bifurcated ,thus, 9/2=4.5 which is closest 3 atmospheres.
Thus,the pressure of gas in the middle container will be closest to 3 atmospheres.
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Consider the redox reaction 3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3Ni(s) Which substance gets oxidized? Ni Ni2+ Ni 2 + Co Co Co3+ Co 3 + Which substance gets reduced? Co Co Co3+ Co 3 + Ni Ni Ni2+ Ni 2 + What is the oxidizing agent? Co3+ Co 3 + Co Co Ni2+ Ni 2 + Ni Ni What is the reducing agent? Ni Ni Co Co Ni2+ Ni 2 + Co3+ Co 3 +
Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent,
3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3Ni(s)
The charge that indicates an object's capacity to gain, lose, or share electrons is known as the oxidation number.
Increasing the number of oxidations is oxidation.
Co is oxidised, changing from Co(0) to Co. (III).
Decrease in oxidation number equals reduction.
Ni (II) is reduced to Ni2+ from Ni2+ (0).
An oxidising agent is something that reduces itself while oxidising others.
Ni2+ reduces itself to Ni after oxidising Co to Co (III) (0). Ni2+ is an oxidising agent, then.
A reducing agent is something that both reduces other things and oxidises itself.
Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent, then.
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Under the right conditions, sometimes atoms and molecules (reactants) will come together to form new
molecules (products)? When this happens, is matter being created?
Answer:
Matter is made up of extremely tiny particles called atoms and molecules .So i think when joined matter is formed
A runner reaches a speed of of 3m/a after accelerating at 2.25m/s2 whilst travelling a distance of 2m what is the initial speed
The initial speed of the runner would be 0 m/s.
Speed determinationThe initial speed of the runner according to the illustration can be determined using one of the equations of motion.
Final speed (v) = 3 m/s
Acceleration (a) = 2.25 m/s2
Distance covered (s) = 2 m
Initial speed (u) = ?
Using the equation: [tex]v^2 = u^2 + 2as[/tex]
Thus: 3^2 = u^2 + 2x2.25x2
9 = u^2 + 9
u^2 = 9 - 9
u = 0 m/s
In other words, the initial speed of the runner is 0 m/s. The runner started from zero and accelerated to as speed of 3 m/s.
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100 g of calcium carbonate was heated until it decomposed to give calcium oxide and carbon dioxide. 56 g of calcium oxide was left. Work out the mass of carbon dioxide given off.
Answer:
44g of carbon dioxide was produced
Explanation:
If 100 g of calcium carbonate was heated until it decomposed to give calcium oxide and carbon dioxide and 56 g of calcium oxide was left. The mass of carbon dioxide, given off, is 44 g.
How to find the mass of carbon dioxide?According to the rule of conservation of matter, which stipulates that during a chemical reaction, matter cannot be generated or destroyed but can only be changed from one form to another,
We recognized that a reactant's total mass is equal to its total mass of products, that is,
The total mass of reactant is equal to the total mass of products
According to the above information, we can get the mass of CO₂ carbon dioxide, given off as follows:
CaCO₃ → CaO + CO₂
Mass of CaCO₃ is 100 g
Mass of CaO is 56 g
Mass of CO₂ =?
So, total mass of reactant = Total mass of products
Mass of CaCO₃ is equal to mass of CaO + mass of CO₂
100 = 56 + mass of CO₂
Mass of carbon dioxide = 100 – 56
Mass of carbon dioxide = 44 g
Thus, the mass of carbon dioxide, CO₂ given off, is 44 g.
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the ionized or dissociated carboxyl group may be written as __________.
The chemical name for the ionized or dissociated carboxyl group is the carboxylate anion. The anion produced by the dissociation of a carboxylic acid is known as the carboxylate anion (RCOO).
With aqueous solutions of sodium hydroxide (NaOH), sodium carbonate (Na 2 CO3), and sodium bicarbonate, carboxylic acids react to produce salts whether or not they are soluble in water (NaHCO 3). On one of a molecule's sides, there are carboxyl groups. The H from the hydroxyl aggregate is released as a free ionized proton (H+) when it ionises, giving the remaining O a -ve charge. This charge oscillates back and forth between the two oxygen molecules, maintaining a sporadic ionized state. Carboxyl group characteristics.
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Hypothesis Theory Law a description that predicts what happens, but does not explain how an explanation that has been tested and verified an untested explanation based upon observation or known facts A botanist guesses, but has not verified that plants with one red-flowered and one white-flowered parent will have pink flowers Scientists, after many experiments, state that matter is composed of atoms
A Hypothesis Theory Law is described as a group of presumptions that attempt to explain the cause and effect of an event.
A hypothesis is an unfinished or proposed explanation that needs more information. A combination of specific cause and effect and norms might be referred to as law. The aforementioned statements therefore fall under the category of a description that foretells what will happen but does not explain how law, Following experiments, scientists claim that atoms make up matter in theory.
A hypothesis is an unproven explanation supported by observations or known facts. Botanists speculate, but have not confirmed, that plants with one parent having red flowers and the other having white blooms will have pink flowers. A hypothesis that has been tested but unproven.
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You now need to make 150 mL of a 1 mg/mL hemoglobin solution. How many mg will you need?
Your scale measures mass in grams. How many grams of hemoglobin will you need to make the above solution?
150mg, which is equivalent to 0.15g, will be needed to make 150mL of the hemoglobin solution.
How to convert units of mass?Mass is a quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement or grams, milligrams etc.
According to this question, one needs to make 150 mL of a 1 mg/mL hemoglobin solution. This means that;
1mg = 1mL
Hence, 150mL will need 150mg
Since 1mg = 0.001g
150mg = 150 × 10-³ = 0.15grams.
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On the electromagnetic spectrum what two types of waves are microwaves between?
infrared waves and radio waves
infrared waves and x-rays
visible waves and infrared waves
gamma rays and ultraviolet waves
On the electromagnetic spectrum, two types of waves are microwaves infrared waves, and radio waves. The correct option is A.
What is the electromagnetic spectrum?The range of electromagnetic radiation frequencies, their wavelengths, and photon energies are referred to together as the electromagnetic spectrum.
In the electromagnetic spectrum, radio waves have the longest wavelengths and frequently have frequencies of 300 gigahertz or less. An area of the electromagnetic radiation spectrum is known as infrared radiation (IR), also known as just infrared.
Therefore, the correct option is A. infrared waves and radio waves.
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Answer:
infrared waves and radio waves
Explanation:
the addition of ammonia and ________ to water produces a buffer solution. a) NH4Cl
b) NaBr
c) NH3
d) NaNO3
e) Kl
Answer:
The addition of ammonia (NH3) and NH4Cl to watwr produces a buffer solution.
Explanation:
Because, to make a buffer solution from a weak base compound, a salt of the conjugate acid can be added.
Because NH3 has a conjugate acid, namely NH4, the suitable salt added for NH3 to become a buffer solution is NH4Cl.
How many miles can you drive, if your car gets 29.50 miles per gallon and you have 12.00 gallons of gas
The number of miles one can drive if a car gets 29.50 miles per gallon with 12.00 gallons of gas would be
Dimensional analysisThe car in question can cover a distance of 29.50 miles per gallon of gas and there is a total of 12.00 gallons of gas available. If one gallon can cover a distance of 29.50 miles, then the distance that the 12 gallons can cover can be calculated using dimensional analysis as follows:
1 gallon = 29.50 miles
12 gallons = 28.50 x 12
= 342 miles
In other words, if one gallon can cover a distance of 29.50 miles, then the 12.00 gallons of gas will cover a total distance of 342 miles.
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In the box below, draw the open-chain structure (as a Fischer projection) of 2-deoxy-D-glucose. You may draw your Fischer projection without using wedged or hashed bonds. Align the Fischer projection vertically, e.g. Show explicitly the bonds to any hydrogens attached to chiral carbons. Do not show bonds to other hydrogens. A start structure for you modify is provided in the sketcher.
Below is an example of the open-chain structure (as a Fischer projection) of 2-deoxy-D-glucose.
The Fischer projection should be aligned vertically, with the carbon atoms at the top and bottom and the oxygen atoms on the left and right. The chiral carbon atoms should be labeled and any hydrogens attached to them should be explicitly shown. Note that bonds to other hydrogens should not be shown.
O O | /| | / | | H | H | H | | H | | H | | H | H | H | | H | |H | C--C--C--C--C
The diagram provided is a Fischer projection of 2-deoxy-D-glucose. The vertical alignment of the carbon atoms at the top and bottom, and the oxygen atoms on the left and right is correct. The chiral carbon atoms should be labeled and any hydrogens attached to them should be explicitly shown. Note that bonds to other hydrogens should not be shown.
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The arrangement of glycosidic linkages in _______ makes it a much more structurally stable molecule than _______.
The arrangement of glycosidic linkages in cellulose makes it a much more structurally stable molecule than starch.
Cellulose is thicker than sugar, which is water-insoluble. On the other hand, the Starch is less weak than cellulose and can be dissolved in warm water. The underlying stability comes from the dense H-bond network constructed among the crystalline-ordered polysaccharide chains.
Starch is made up of -glucose subunits, whereas cellulose is made up of -glucose subunits.
Cellulose is unbranched and a straight-chain polymer of glucose, whereas starch is branched.
Cellulose is comparatively much stronger than starch as Cellulose has more hydrogen bonds (Beta 1,4 Linkages) between adjacent glucose units, both within a chain and between adjacent chains, making it a tougher fiber than glycogen or starch.
An interesting and unique feature of this assembly is the multiple possibilities of H-bonding patterns within a single stable structure of cellulose.
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The arrangement of glycosidic linkages in cellulose makes it a much more structurally stable molecule than starch.
A complex carbohydrate called cellulose serves as the main structural element of plant cells. It is a polymer made formed of glucose simple sugar repeating units. Cellulose is an essential part of dietary fibre and has several industrial uses, including the creation of paper, fabrics, and biofuel. Hydrogen connections between the cellulose chains in plant cells are what give cellulose its distinctive strength and stiffness. Since it can be broken down by bacteria and fungus, cellulose is really the most prevalent biomaterial on Earth and a significant energy source for many other creatures.
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which 2 particles have opposite sides
Answer: Protons and electrons
Explanation: Protons are positively charged and electrons are negatively charged.
Answer: protonproton andand electron
Explanation:
ProtonProton isis positivelypositively chargedcharged andand electornelectron isis negativelynegatively chargedcharged withwith massmass numbernumber 11 forfor each
Explain why a covalent compound has to be given to us; why can't we predict them as we would an ionic compound?
The properties of the covalent compounds differ from those of the ionic compounds hence the covalent compounds must be given to us.
What are ionic compounds?We know that the ionic compounds has to do with the compounds that are able to dissolve well in the solution. This implies that they are soluble in water. If they are soluble in water then we can be able to know that they are ionic.
The ionic substance can also be know to have a high melting point as well as a high boiling point. Having said all of these as we have seen above, we can see that the ionic compound is quite different from the covalent compound.
All of the covalent compounds that we have do not show any of the properties that I have described above for the ionic compound hence they must be given to us.
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What volume of solvent should be added to 36.8 g of CH3OH to produce a 0.500 M solution of CH3OH?
1. 0.418 L
2. 73.6 L
3. 0.836 L
4. Not enough information is given
5. 184 L
6. 2.30 L
7. 0.598 L
The correct response is option 6, and 2.30 L must be added to 36.8 g of CH3OH to make a CH3OH solvent that is 0.500 M in volume. The OH functional group is where the Lewis base's characteristics originate.
As a result, CH3OH has properties that are shared by a weak acid and a base. Following primary alcohols are secondary and tertiary alcohols, then alkyl. As a primary alcohol, methanol is more potent than secondary and tertiary alcohols but less potent than water. Water, which dissolves all the ions and proteins in a cell and is the most common solvent used by living things, is also a solvent for polar compounds. In a particular volume of solvent, a varied amount of solute can dissolve depending on the temperature.
V = m / MWM = 36.8 / (32.04) (0.500) = 2.30L.
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Apple juice has a pH of 2.9, and water has a pH of 7.0. Which substance has a higher concentration of hydronium ions, and how much higher is it
Apple juice has a pH of 2.9, and water has a pH of 7.0. pH of 2.9 has higher concentration. It is higher by 0.0012599
We know pH formula
pH = -log [H₃O ]
where
H3O is hydronium concentration
now, we can find concentrations
At pH=2.9:
we can use formula
pH = -log [H₃O ]
2.9 = -log [H₃O ]
H₃O= 10^2.9
H₃O = 0.00126
At pH=7:
we can use formula
pH = -log [H₃O ]
7 =-log [H₃O ]
H₃O = 10⁻⁷
H₃O = 0.0000001
We can see that
pH=2.9 has higher concentration
Difference between concentration is
=0.00126-0.0000001
=0.0012599
Your question is incomplete mostprobably your full question was
Apple juice has a pH of 2.9, and water has a pH of 7.0. Which substance has a higher concentration of hydronium ions, and how much higher is it? Use the formula , where represents the hydronium ion concentration. has a higher concentration of hydronium ions. Its hydronium ion concentration is times higher than in the other liquid.
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Illustrate the relationship between the acceleration due to gravity and the force of gravity on your lander. What happens to acceleration as force increases? Explain and illustrate their relationship using a graph.
The force of gravity causes items to fall toward the ground. The force of gravity accelerates items as they descend to the ground. Velocity is a measure of the speed and direction of motion, and acceleration is a change in velocity.
What is gravity?The force that pulls items toward the centre of a planet or other entity is called gravity. All of the planets are kept in orbit around the sun by gravity.
Things fall toward the earth due to the force of gravity. As objects fall to the ground, gravity accelerates their descent. Acceleration is a change in velocity, while velocity is a measurement of the speed and direction of motion.
The acceleration that the Earth gives to things on or near its surface is known as gravity, and it is represented by the Greek letter g. This acceleration is expressed in square metres per second in SI units.
Thus, this is the basic relationship between acceleration due to gravity and the force of gravity.
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What are the short term effects of climate change?
Sea surface temperatures will rise. More heat energy will emerge from this, increasing the likelihood that tropical cyclones may form. Floods and cyclones worsen as a result of increased evaporation and heavy precipitation brought on by warming are the short term effects of climate change
Short-term climatic changes also include those brought on by the ocean and atmosphere interacting. Seasons. Because the amount of solar energy received by Earth at various latitudes varies throughout the year, seasons develop. Climate all throughout the world are impacted by these changes in wind, current, and ocean temperature. Changes often last a year or two, while climate refers to the area's typical long-term weather patterns. The average weather for a specific area and time period, often averaged over a 30-year period, is how some scientists describe climate. Sea surface temperatures will rise. More heat energy will emerge from this, increasing the likelihood that tropical cyclones may form. Warming also causes increased evaporation, which increases the frequency of heavy rain and snowfalls and causes floods.
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Short term of effects of climate change includes the rise in temperature, increased warmth of Water, expansion of ocean, heavy rains, floods and severe storms.
A relatively brief occurrence or its repercussions are referred to as short term effects. The short term effects of climate change includes the following,
The waters will warm as the temperature rises. More heat energy will be produced as a result, which will boost the likelihood that tropical cyclones will form. The global surface temperature increases along together the concentrations of greenhouse gas.
Most of the temperature from global warming is absorbed by the ocean. All ocean depths have experienced a significant increase in ocean warming during the past 20 years. Water expands as it becomes warmer, therefore as the ocean warms, so does its volume.
In many areas, destructive storms have increased in ferocity and frequency. More moisture evaporates as temperatures rise, aggravating extremely heavy rains and flooding and resulting in more severe storms.
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mine tailings contain ________, which harms fish and other aquatic organisms.
Mine tailings contain sulphide, which harms fish and other aquatic organisms.
Fish can swiftly perish from hydrogen sulfide's extreme toxicity. Fish that are exposed experience an increase in secondary bacterial, parasitic, and fungal infections as well as a possible premature demise. Water-life is harmed by hydrogen sulfide, a poisonous gas, especially when it is unionized. It might naturally occur at concentrations that are harmful to fish reproduction and survival (Colby and Smith, 1967). The materials left over after an ore is separated into its valuable and economically unviable components are known as tailings in the mining industry. The materials left over after an ore is separated into its valuable and economically unviable components are known as tailings in the mining industry.
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A sample of steel is composed of 5 percent carbon and 95 percent iron. Which is the solvent? O iron O carbon steel O Steel is not a solution. It is a mixture. O A solid cannot be a solvent
Iron is the solvent.
In general, Solvent can is known as the substance which is having an ability for dissolving the solute that can form solution with it. on the other hand solute is the substance which generally gets dissolved, in the solvent which is a dissolving medium. Hence, Solutions can be made out of many different types and forms of solutes and solvents.
So , we can say that Solvent are substances that gets dissolves in the solute, forming a solution. Solvent can also be liquid but can also be a solid, a gas other type of fluid. Example of the best solvent is water because of its polarity and ability to form hydrogen bonds, it is capable of dissolving in to many different kinds of molecules.
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Which of the three substances has the greatest porosity? a. gravel
b. sand c. silt
d. all are equal please select the best answer from the choices provided a b c d
Gravel is more bigger than sand or silt. Its grains are arranged in such a manner that their integral spaces are very bigger so they are more porous.
A mixture is created when two or more compounds are mixed while maintaining the chemical identities of each component. The components of a combination do not interact chemically, in other words. Mixtures are classed on the basis of consistency and agreement between the particle sizes of the components.
The characteristics of sand and gravel when they are mixed are the same as when they are not mixed. A sieve can separate the sand and gravel since gravel is larger than sand.
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How many individual atoms (hydrogen and oxygen atoms) are in one molecule of water
____ are small components typically made out of aluminum with fins that help to dissipate heat.
a.
ACs
c.
Heat buses
b.
Fans
d.
Heat sinks
Heat Sinks are small components typically made out of aluminum with fins that help to dissipate heat.
Heat sinks are often composed of CNC-machined copper or aluminum, and they contain heat sink fins or pins that enhance the component's surface area to aid in the transmission of heat to the surrounding fluid.
A part known as a heat sink facilitates heat transfer away from a hot device. It accomplishes this by increasing the device's operating surface area and the volume of low-temperature fluid that passes through it.
The main purpose of heat sinks is to increase the surface area of an electronic component that is in direct contact with a coolant. This will enable more heat to be easily dispersed, lowering the operating temperature of the device.
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A compound composed of 2.1% H, 29.8% N, and 68.1% O has a molar mass of approximately 50 g/mol. What is the formal charge of the nitrogen?
2.1% H, 29.8% N, and 68.1% O molecules will have zero formal nitrogen charge and a molar mass of roughly 50 g/mol. The nuclear charge of +7 is balanced by 5 valence electrons and 2 inner core electrons.
Therefore the charge on N in nitrous acid is nominally zero. Nitrogen acquires a formal +1 charge when it is quaternized in nitric acid, HNO3. Nitrogen is a chemical element with atomic number 7 and the letter N. The lightest nonmetal element is nitrogen, which is part of group 15 of the periodic table, also called the pnictogens. The nuclear charge of +7 is balanced by 5 valence electrons and 2 inner core electrons.
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Select the best IUPAC name for the molecule below: a. E-4-(5-isopropyl-2-methylphenyl)but-3-en-2-one b. E-4-ispropyl-2-(3-oxo-but-1-ene)toluene c. E-4-(3-isopropyl-6-methylphenyl)but-3-en-2-one d. E-4-(5-isopropyl-2-methylphenyl)but-1-en-3-one
a. E-4-(5-isopropyl-2-methylphenyl)but-3-en-2-one is the best IUPAC name for the molecule below
IUPAC (International Union of Pure and Applied Chemistry) name is a systematic method for naming chemical compounds according to the rules set forth by the International Union of Pure and Applied Chemistry. IUPAC nomenclature is a standardized method for naming chemical compounds, ensuring that each compound has a unique and unambiguous name.IUPAC names are based on the chemical structure of the compound and follow a set of rules and conventions. These rules dictate the order of priority for different functional groups and substituents, as well as the use of prefixes and suffixes to indicate the type and location of these groups.The process of determining the IUPAC name of a compound begins with the identification of the parent hydrocarbon skeleton, followed by the application of rules to identify the location and priority of substituents. The final name will contain all the information needed to specify the compound's molecular structure.
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The point group of BrF3 is C2v. Draw the structure of BrFz and compare your answer with the predictions of the VSEPR model.
The Lewis structure of BrF3 has a total of 28 valence electrons.The valence shell electron pair repulsion (VSEPR) theory is a model that predicts the 3-D molecular geometry of an ion or molecule.
Which three premises underlie the VSEPR theory?Negatively charged electron pairs will go as far apart from one another as they can. Bonding electron pairs use significantly less area than lone pairs. In comparison to single bonds, double bonds are larger in size.The valence shell electron pair repulsion (VSEPR) theory is a model that predicts the 3-D molecular geometry of an ion or molecule based on the number of valence shell electron bond pairs between the atoms. The electron pair arrangement in this model is predicated on the idea that electrons will try to reduce their mutual repulsion.The Lewis structure of BrF3 has a total of 28 valence electrons.To learn more about valence shell electron pair repulsion refer to:
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