Answer:different numbers of electrons in their valance shells
Explanation:voodoo$
Answer:
the same number of valence electrons
Explanation:
What is the electric force on a proton 1.9 fm from the surface of the nucleus? hint: treat the spherical nucleus as a point charge.
The electric force on a proton 1.9 fm from the surface of the nucleus 3.1 × 10² N
Evaluating :It is known that charge on xenon nucleus is equal to +54e. And, charge on the proton is equal to +e. So, radius of the nucleus is as follows.
r = [tex]\frac{6.0}{2}[/tex]
= 3.0 fm
Let us assume that nucleus is a point charge. Hence, the distance between proton and nucleus will be as follows.
d = r + 1.9= (1.9 + 2.5) fm
= 4.4fm
= 4.4 × 10⁻¹⁵ (as 1 fm = 10⁻¹⁵ )Therefore, electrostatic repulsive force on proton is calculated as follows.
F = [tex]\frac{1}{4\pi E_{0} } \frac{q_{1} q_{2} }{d^{2} }[/tex]
Putting the given values into the above formula as follows.
F = [tex]\frac{1}{4\pi E_{0} }\frac{q_{1} q_{2} }{d^{2} }[/tex]
= 9×10⁹×[tex](\frac{54 * 1.6 *10^{-19} }{4.4 * 10^{-15} } )[/tex]²
= 311.2 N
= 3.1 × 10² N
Thus, we ca conclude that 3.1 × 10² N is that the electric force on a proton 1.9 fm from the surface of the nucleus.
Nucleus of a particle :The nucleus may be a collection of particles called protons, which are charged , and neutrons, which are electrically neutral. Protons and neutrons are successively made up of particles called quarks.
What is the charge of a nucleus?The nucleus (plural, nuclei) may be a positively charged region at the center of the atom. It consists of two sorts of subatomic particles packed tightly together. The particles are protons, which have a positive charge , and neutrons, which are neutral in charge
Why nucleus is positively charged?A nucleus of an atom has protons and neutrons. we all know that a proton has a charge of + 1 , while a neutron has no charge, or 0. Therefore, the nucleus of an atom will always have a charge .
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which glassware would you use to do each of the following tasks: beaker, erlenmeyer flask, graduated cylinder, pipette, or volumetric flask?deliver 25.00 ml of water into a reaction
Volumetric pipetts, volumetric flasks and burette are the most accurate, the glassware makers calibrate these to a high level of accurасу.
However, if we need exactly 25.0 ml to make up a 'standard' solution, only a volumetric flask would be appropriate
The graduated cylinder with most subdivision between ml marks is the most precise.Typically this would be the 50 ml graduated cylinder,However, pipette buzette also can be to measure some of water.volumetric flasks use To contain fixed volume at a certain temperature, it is to Clean first (no need to dry) then add sample 1/3 of the way then add water to dissolve by inverting and shaking. Then fill to the 500ml mark using squeeze bottle then eye dropper. Dirty glassware will cause water to hang on the sides.To know more about volumetric flask visit : https://brainly.com/question/19517011
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Pseudoscience is best defined as ____ science.
factual
false
fun
feedback-based
Answer:
false
Explanation:
Pseudoscience is a field of study where researchers claim to be scientific in their research and adopt some of the procedures of science, but fail to fulfill the criteria effectively.
The mass number of an atom is equal to the total number of protons and neutrons.
is it true or false
In the first 70.0 ss of this reaction, the concentration of nono dropped from 1.32 mm to 0.400 mm . calculate the average rate of the reaction in this time interval.
The reaction will be thermodynamically spontaneous if the temperature is below 175 K.
According to this formula, when:
ΔG = ΔH - T*ΔS
when the reaction is thermodynamically spontaneous ΔG < 0
∴ ΔH - T* ΔS = 0
∴T*ΔS = ΔH
∴ T = ΔH / ΔS
when we have:
ΔH = -70KJ
and ΔS = -0.4 KJ/K
So by substitution:
T = -70KJ /- 0.4
= 175 K
∴the certain temperature below which the reaction will be thermodynamically spontaneous is 175
What is thermodynamics ?The rules of thermodynamics explain how energy in a system evolves and whether a system can make use of its environment to produce productive work.
In an automobile, the engine is a thermodynamic system that burns fuel inside the cylinder; the radiator, piston, exhaust system, and ambient air make up the system's environment.
Thermodynamics abides by four laws. They discuss heat, work, temperature, and entropy. They are employed in chemistry, among other sciences, as well as in thermodynamics.
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Carbon dioxide is a greenhouse gas that shields the planet from the sun's uv radiation and helps prevent global warming.
a. true
b. false
False, Carbon dioxide is a greenhouse gas doesn't shields the planet from the sun's uv radiation and helps prevent global warming.
When particular gases, referred to as greenhouse gases, build up in the Earth's atmosphere, the greenhouse effect occurs. Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ozone (O3), and fluorinated gases are examples of greenhouse gases.The sun's light can reach Earth's surface thanks to greenhouse gases, which then trap the heat that is reflected back from the surface inside Earth's atmosphere.That is ozone layer which shields the planet from the sun's uv radiation and helps prevent global warming. It is layer in stratosphere which doesn't allow harmful sunrays to enter earth surface because it can cause many health issues to human being like skin cancer etc.Thus it is not cabondioxide that protect planet from UV rays.
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A 0.10 m solution of lactic acid, ch3chohco2h, has a ph of 2.43. what is the ka? (for simplicity, just abbreviate lactic acid as ha.)
The value of K(a) is 1.4 × 10⁻⁴.
The pH scale is used in chemistry to determine whether an aqueous solution is basic or acidic. Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
A weak monoprotic acid, lactic acid (HA) dissociates in accordance with the following equilibrium:
HA ⇋ H⁺ + A⁻
K(a) = [H⁺] × [A⁻] / [HA]
If C is the initial acid concentration and x is the dissociated concentration of each product, then the expression at equilibrium is:
K(a) = x² / ( C− x )
Now substituting the values C = 0.10 m and the ph of lactic acid is 2.43 in:
x = [H+]
[H+] = 10^{− pH}
10⁻²·⁴³ = 3.63 × 10⁻³ M
Therefore,
K(a) = x² / ( C − x )
K(a) = ( 3.63 × 10⁻³ M)² / ( 0.10 M − 3.63 × 10⁻³ M )
K(a) = 1.4 × 10⁻⁴
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Write a balanced half-reaction for the oxidation of chromium ion to dichromate ion in acidic aqueous solution. be sure to add physical state symbols where appropriate.
The balanced equation is:
2Cr^+3(aq) +7H2O(l) --> Cr2O7^2-(aq) + 14H^+(aq)
What is balanced equation?
A chemical equation is a symbol- and formula-based symbolic representation of a chemical reaction, with the reactant entities presented on the left side and the product entities on the right.
A balanced equation is one for a chemical reaction in which the overall charge and the number of atoms for each component are the same for both the reactants and the products. In other words, the mass and charge of both sides of the reaction are equal.
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calculate the ph of a solution prepared by diluting 3.0 ml of 2.5 m hcl to a final volume of 100 ml with h2o
The pH of a solution prepared by diluting 3.0 mL of 2.5 M HCl to a final volume of 100 mL with H₂O is 1.12.
Given data :
Original concentration of HCl before dilution (C₁) = 2.5 M
Volume of HCl to be diluted (V₁) = 3.0 mL
Final volume of HCl after diluting (V₂) = 100 mL
Final concentration of HCl after dilution (C₂) = ?
To Calculate the final concentration of solution, equation used is -
C₁.V₁ = C₂.V₂
Putting values in equation,
2.5 M x 3.0 mL = C₂ x 100 mL
C₂ = 2.5 M x 3.0 mL
100 mL
C₂ = 0.075 M
When HCl is diluted with H₂O, it dissociates. The chemical equation of dissociation reaction of HCl is -
HCl(aq) ⇄ H⁺(aq) + Cl⁻(aq)
Concentration of HCl = concentration of H⁺ = 0.075 M
Using equation of pH,
pH = -log[H⁺]
pH = -log[0.075]
pH = 1.12
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4. What is the frequency of light that has a wavelength of 4.25 x 10^-8 m?
Frequency of light = 0.705 x 10^16 per second.
Frequency: It is the quantity of waves passing a particular area in a predetermined period of time. Unit of frequency is second ^-1.
Wavelength: A wave's wavelength is the separation between its two subsequent crests or troughs. It is calculated using the wave direction. Unit of wavelength is meters.
Speed of light: the rate at which light waves move through various substances. In particular, it has now been determined that the speed of light in a vacuum is exactly 299,792,458 meters per second.
Inverse correlation exists between frequency and wavelength.
f ∝ 1/ λ
∴f = c /λ
where,
c is the speed of light (3 x 108 m/s), and f represents frequency.
λ is wavelength
∴ f = 3 x 10^8 / 4.25 x 10^-8
f = 0.705 x 10^16 /s
Hence, frequency of the light wave will be 0.705 x 10^16 /s
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what other element would react violently with chlorine to produce a compound with similar properties?
The elements that react violently with chlorine are;
SodiumPotassiumRubidiumCesiumWhat elements reacts directly with chlorine?We know that chlorine is very highly reactive element that is found in group 17 of the periodic table. Owing to the fact that chlorine is highly reactive, it does not occur free in nature. This is why we always find in combined state.
The elements of group 1 could react violently with chlorine to produce a chloride and these elements are;
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What is the ph of a solution that results from adding 0.059 mol naoh (s) to 1.47 l of a buffer comprised of 0.391 m benzoic acid, c6h5cooh and 0.391 m sodium benzoate, c6h5coona?
The pH of a solution that results from adding 0.059 mol Na (s) to 1.47 l of a buffer comprised of 0.391 m benzoic acid, c6h5cooh and 0.391 m sodium benzoate, c6h5coona is 5.418.
What do you mean by pH?pH is a measure of how acidic/basic the water is. The range goes from 0 - 14, with 7 being the neutral. pHs of less than 7 indicate the acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free hydrogen ions is the acidic, whereas water that has more free hydroxyl ions is basic. Since the pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically. pH is reported in the "logarithmic units". Each number represents a 10-fold change in acidity/basicness of the water. Water with a pH of five is ten times more acidic than the water having a pH of six.
pH, quantitative measure of acidity or basicity of aqueous or other liquid solutions. The term, widely used in the chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion—which ordinarily ranges between about 1 and 10−14 gram-equivalents per liter—into the numbers between 0 and 14.
molarity of NaOH= 0.059mol/1.47L
= 0.0401 M
Molarity of acid= 0.391 M
Molarity of buffer= 0.391 M
The pKa value of = 4.19
Henderson - Hasslbach Equation:
pH = pKa + log(salt/acid)
=pKa+ log[( salt + C)/(acid-C)]
= 4.19 + log[(0.391 M + 0.0401 M)/ (0.391 M - 0.0401 M)]
= 4.19 + 1.22
= 5.418
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how many ml of 4% creosol solution need to be mixed with water to prepare 50 ml of a 1:150 creosol solution
The total quantity of creosol solution is q1 = 8.25ml.
What is creosol solution?a flavourless, strong, oily liquid, CH3OC6H3(CH3)OH, made from guaiac resin and beechwood tar; it is an active ingredient in creosote and is used as an antibacterial. Word genesis.
total quantity (q2) = 50 ml
concentration of final solution
C2 = 1:150
= 1/150 * 100
= 0.66%
quantity of stock * concentration of stock = quantity of final solution * concentration of final solution
q1 * c1 = q2 * c2
q1 = 50 * 0.66/4
q1 = 8.25ml
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you are runnig a reaction to make a carboxylic acid, but what appears to be the product spot is too low on the tlc plate and is elongated, i.e., it isn't a nice circle but is stretched out a lot. to make this spot rounder and move a little farther, which of the following is most likely to
Add a trace of acidic acid to the eluting solvent mixture.
What is TLC?TLC is the acronym for thin layer chromatography. This type of chromatography occurs when we have an eluting solvent and a stationary phase such as a thick adsorbent paper on a support.
In a chromatography, there is a stationary phase and a mobile phase. The stationary phase here is the sold support while the mobile phase is the eluting solvent which carried the mixture to be separated.
This stationary phase is spotted with the mixture to be eluted and the chromatogram is observed on the stationary phase. We know that an acid would be eluted by a polar solvent.
If the chromatogram is a stretched circle that appears rounder as you move a little farther then you have to add a trace of acidic acid to the eluting solvent mixture.
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Missing parts;
You are running a reaction to make a carboxylic acid, but what appears to be the product spot is too low on the tlc plate and is elongated, i.e., it isn't a nice circle but is stretched out a lot. To make this spot rounder and move a little farther, which of the following is most likely to work?
Using a more polar eluting solvent mixture.
Adding a trace of ammonium hydroxide to the eluting solvent mixture.
Adding a trace of water to the eluting solvent mixture.
Adding a trace of methanol to the eluting solvent mixture.
Adding a trace of acidic acid to the eluting solvent mixture.
What orbitals overlap to form the c-h bond in ethene (h 2c=ch 2)? s-p p-p s-sp3 s-sp2 s-sp
The orbitals overlap to form the c-h bond in ethene, the s-sp2 orbital overlaps to create the C-H bond.
What is sp2 hybridisation?
Three sp2 orbitals, each with a 33% s character and a 67% p character, are created when one s orbital and two p orbitals hybridize. When an atom has three electron groups surrounding it, this kind of hybridization is necessary.
Trigonal hybridization is another name for the sp2 process. One's' orbital and two 'p' orbitals of equivalent energy are combined to create the new hybrid orbital known as sp2. At 1200, a combination of s and p orbitals developed in trigonal symmetry.
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probing high-density nuclear symmetry energy with ξ −/ξ 0 ratio in heavy-ion collisions at √ snn ∼ 3 gev
One of the most ambiguous characteristics of dense neutron-rich materials is the high-density behavior of nuclear symmetry energy.
What is nuclear symmetry energy?The nuclear symmetry energy describes how the binding energy changes as a nuclear system's neutron to proton ratio changes. Given that it only pertains to the dual nature of nuclear systems, this is one of the most crucial aspects of nuclear physics in general. As a result, it is one of the most important physical variables that influences how many phenomena and nuclear processes behave in terms of physics. This review article provides an overview of the function and significance of the nuclear symmetry energy in many study areas, as well as the reliability of its estimation from phenomenology and the microscopic many-body theory.
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determine whether an observational or experimental study is appropriate to address the following statement. a gas station owner wants to identify if a need for additional staffing exists.
If a gas station owner wants to identify if a need for additional staffing exists, an observational study could suffice here.
What is an observational study?The term observational study refers to a study in which the research only dependent on what could be obviously seen with out trying to compare the effects of an independent on a dependent variable by empirical means.
If the owner of a gas station wants to know if there is need for more staffing. All he needs is to observe the rate of work in the hands of the current staff strength and make projection. Only a observational study could suffice here.
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Mercury metal is poured into a graduated cylinder that holds exactly 20 mL. The mercury used to fill the cylinder has a mass of 306.0 g. From this information, calculate the density of mercury.
*
Don't forget the units!
Taking into account the definition of density, the density of mercury is 15.3 g/mL.
Definition of densityDensity is defined as the property that matter has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
It can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density of mercuryIn this case, you know that:
Mass= 306 gVolume= 20 mLReplacing in the definition of density:
density= 306 g÷ 20 mL
Solving:
density= 15.3 g/mL
In summary, the density of mercury is 15.3 g/mL.
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Which of the following questions can be answered by science? a What makes a song sound beautiful? b What is the meaning of life? c What makes a painting beautiful? d What are the effects of low pH in soil?
The question that can be answered by science is What are the effects of low pH in soil. So, the correct option for this question is D.
Science is a branch of scientific study which involves the knowledge application and understanding of the social world and natural world on the basis of evidences.
Science deals with the natural phenomena and nature. So, the soil is an abiotic component of nature.
It can be classified broadly into the three categories such as Physics, Chemistry, and biology. Each sub-classification tells and demonstrates its own field of studies.
In the soil depends, the low pH depends on various factors like the complexity of the organisms living on a particular area, resources, etc.
So, the question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.
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A weak acid ha has a pka of 5.0. if 1.0 mol of this acid and 0.1 mol of naoh were dissolved in one liter of wat,er what would be the final ph?
A weak acid ha has a ph of 5.0. if 1.0 mol of this acid and 0.1 mol of naoh were dissolved in one liter of wat,er The weak acid is partly neutralised by the alkali: HA(aq)+NaOH(aq)→NaA(aq)+H2O(l).
What is ph?Chemistry uses a pH scale to categorize an aqueous solution's acidity or basicity. The term pH originally meant "potential of hydrogen." In comparison to basic or alkaline solutions (solutions with higher H+ ion concentrations), acidic solutions have lower pH values measured.
The p Hscale is logarithmic and inversely proportional to the amount of hydrogen ions present in the solution.
M is equal to mol dm3. At a temperature of 25 °C (77 °F), basic solutions are defined as those with a pH greater than 7, and acidic solutions as those with a pH lower than 7. Solutions having a pH of 7 are regarded as neutral at this temperature (e.g. pure water). Temperature affects the pH's neutral value, which drops to below 7 if the temperature exceeds 25 °C.
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The desired product will not form if a strong base is applied to the starting material right away in reaction 1. why does this synthetic route fail to product the desired alkene product?
Synthetic route fail to product the desired alkene product because the base will deprotonate the alcohol and form an alkoxide product.
What to you mean by synthetic route?When a chemist working in lab embarks upon the synthesis of a compound, he or she follows a “synthetic route”— a series of steps by which a chemical compound is assembled from the smaller, less complex bulk chemicals. These routes can be devised based on chemist’s experience and by searching the scientific literature to learn from the experience of other chemists who may have attempted similar synthetic paths in the past.
How do you choose a synthetic route?Chemical yieldingThe Cycle timeNumber of the chemical steps and convergenceUse of the higher molecular weight protecting group and reagentsNumber of the energy-consuming operationsImplementing this approach is the key to reducing API development time as complexity grows and budgets shrink. As with any risk management plan, goal is to be proactive in finding and mitigating sources of risk. This is accomplished by the removing unwanted variability in each stage of a process.
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Specialized molecules secreted to bind ferric ion (fe3 ) and transport it into the cell are know as?
Siderophores are specialized molecules that are released to bind ferric ion (fe3) and convey it into the cell.
What is siderophores?
Microorganisms like bacteria and fungus secrete siderophores, which are tiny, highly-affinity iron-chelating molecules. They assist the organism in absorbing iron. Despite the fact that siderophore functions are now understood to have a wider spectrum. The recognized strongest agents for binding Fe3+ are siderophores.
The main purpose of siderophores, which are tiny molecular iron chelators made by microorganisms, is to remove iron from the host and give germs access to this vital metal nutrient.
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The separation of the components of a mixture is based upon the fact that each component has different choose. Properties. The components of a mixture are separated based on their choose. Properties.
The separation of the components of a mixture is based upon the fact that each component has different physical properties. The components of a mixture are separated based on their physical properties.
For example, crude oil is mixture consist of several different hydrocarbons (alkanes, alkenes...).
This hydroalkanes can be separated from mixture (crude oil) using distilation (usually fractional distillation), because they have different boiling points (physical properties).
Mixture is composed of at least two substances.
Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.
Mixtures can be separeted by physical means, while compounds cannot.
There is a definite recipe to make each mixture, because composition of mixture can vary.
Missing options:
First question, I can choose from CHEMICAL or PHYSICAL
Second question, I can choose from HOMOGENOUS, UNIFORM, PHYSICAL or CHEMICAL.
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a mixture consisting of 1 mol of h2o(g) and 1 mol co(g) is placed in a 5 l reaction vessel at 800 k. at equilibrium, 0.411 mol co2(g) is present as a result of the reaction co(g) h2o(g) ⇀↽ co2(g) h2(g). what is kc at 800 k?
If you have .387mol steam, then you used .387 mol CO, and 3*.387 mole H2. to seek out the molar concentration of CO and H2, subtract what was used from the initial. the quantity of CH4 of course is the same as H2O.
co(g) h2o(g) ⇀↽ co2(g) h2(g).
What is equilibrium?
Equilibrium is the state in which market supply and demand balance each other, and as a result, prices become stable. Generally, an over-supply for goods or services causes prices to travel down, which ends up in higher demand. The balancing effect of supply and demand leads to a state of equilibrium.
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An object has a density of 9.22 g/cm³. What is the mass of 20.21 cm³ of this substance?
The mass of the given object will be 186.3g
The measure of how densely a material is packed together is called density.Formula of density is mass / volumeunit of density is g/cm³ etc.the amount of space a three-dimensional object takes up, expressed in cubic units.unit of volume are cm³, m³, mL and L. we can find out any missing term of other two terms are given.Given,
Density of the object is 9.22g/cm³
volume of the object is 20.21 cm³
we have to find out mass of the object with the help of these two terms.
As we know,
Density = mass / volume
mass. = density × volume
mass = 9.22 g/cm³ × 20.21 cm³
mass = 186.3 g
Therefore mass of given object is 186.3g.
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Why can't a cell stop normal processes during interphase
2 some organisms feed on other organisms without immediately killing them. what term describes this act? a. commensalism b. parasitism c. mutualism d. predation
Answer:
b
Explanation:
It's because parasites actually don't kill the host immediately but after at least a good time the host starts to experience some side effects which can lead to death
Which group of elements has the most similar chemical properties? (1 point)
carbon, nitrogen, and oxygen
uranium, plutonium, and lead
fluorine, chlorine, and iodine
aluminum, silicon, and phosphorus
Answer:
Fluorine,chlorine,Iodine
Explanation:
How many grams of lead (ii) oxide will be produced by the decomposition of 2.50 g of lead (ii) carbonate?
The mass of lead (ii) oxide produced by the decomposition of the reaction will be 2.09 grams.
To find the mass, the given data's are,
Mass of PbCo₃ = 2.50 g
Molar mass of PbCo₃ = 267.21 g/mole
Molar mass of PbO = 223.2 g/mole
What is decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
The given balanced chemical reaction is:
PbCo₃(s) → PbO (s) + Co₂ (g)
Here, calculating the moles of PbCo₃,
Moles of PbCo₃ = ( Mass of PbCo₃ / Molar mass of PbCo₃ )
= ( 2.50 g /267.21 g/mole )
= 0.00936 moles.
Now we have to calculate the moles of PbO,
From the reaction, we conclude that
As, 1 mole of PbCo₃ react to give 1 mole of PbO,
So, 0.0936 moles of PbCo₃ react to give 0.00936 moles of PbO.
So, Calculating the mass of PbO,
Mass of PbO = Moles of PbO × Molar mass of PbO
= 0.00936 moles × 223.2 g/mole
= 2.09 moles.
Therefore, the mass of lead (ii) oxide produced by the decomposition of the reaction will be 2.09 grams.
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What is the iupac name of the following compound? 2-ethyl-4-hexanone 3-methyl-5-heptanone 5-ethyl-3-hexanone 5-methyl-3-heptanone
The correct option is (d) 5-methyl-3-heptanone.
The IUPAC name of the given compound is 5-methyl-3-heptanone.
What is the IUPAC name of the compounds?The International Union of Pure and Applied Chemistry (IUPAC) is the foremost expert on chemical terminology and nomenclature, including the naming of new elements in the periodic table, standardized measurement techniques, atomic weights, and a wide range of other data that has undergone rigorous analysis.
The longest chain of carbons connected by a single bond, whether in a continuous chain or a ring, serves as the foundation for IUPAC nomenclature. According to a particular set of priorities, all deviations, whether multiple bonds or atoms other than carbon and hydrogen are denoted by prefixes or suffixes.
1. First, identify the longest C-chain. Here it is a 7-C chain (-hept)
2. Give the smallest number of functional group (C-3-Ketone)
3. Substitutional group C-5: methyl
Therefore, the IUPAC name of the compound is 5-methyl-3-heptanone.
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The correct question is:
"What is the IUPAC name of the following compound?
(a) 2-ethyl-4-hexanone
(b) 3-methyl-5-heptanone
(c) 5-ethyl-3-hexanone
(d) 5-methyl-3-heptanone"