The empirical formula for the compound containing 42.88% carbon and 57.1% oxygen by mass is Carbon Monoxide (CO).
To find the empirical formula for 42.8% carbon (C) and 57.1% oxygen (O)
First, find the molar mass of each component-
C = 12.010, O = 15.999
Converting to the moles :
C = 3.563, O = 3.568
Finding smallest mole value :
C = 3.563
Dividing all components by smallest value :
C = 1, O = 1.001
By rounding off -
C = 1, O = 1
Combining to get empirical formula : CO
Now, multiplying all by 1 ( molar mass of empirical formula/molar mass of sample = 28.01 / 28.034 ) to get molecular formula : CO
Since multiplied by 1, Therefore, the empirical formula and molecular formula are same.
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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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starting from methyl acetoacetate and any other necessary reagents, complete the most efficient three‑step synthesis of the ketone, 3‑benzyl‑5‑methylhexan‑2‑one, by dragging the appropriate compound(s) into the boxes. only one set of reagents will fit into each box, and all compounds will not be used
starting from methyl acetoacetate and any other necessary reagents, complete the most efficient three‑step synthesis of the ketone, 3‑benzyl‑5‑methylhexan‑2‑one
What are chemical conversions?
A chemical production procedure in which chemical transformation takes place, that is, the product differs chemically from the beginning materials.
Acetoacetate is transformed into BHB, the wealthy supply of strength for the mind. This system of changing fatty acids to ketone our bodies is crucial due to the fact your mind isn't capable of successfully use fatty acids for fuel. Ketones, however, can pass the blood-mind barrier and offer your mind with the strength it desires to function.
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of the two lewis/electron dot structure representations, which is the correct one for phosphorus trifluoride?
Lewis dot structure of PF3 contains 1 lone pair on the central atom(phosphorous) and 3 lone pairs on each outer atom(fluorine).
The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
The trigonal pyramid is the form or molecular geometry of PF3. Since PF3's core region comprises four zones of electron density, its electron geometry is tetrahedral. One lone pair is present on the core atom (phosphorus) in the Lewis dot structure of PF3, and three are present on each outside atom (fluorine).
See the reference image below:
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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.
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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Which quantity is held constant when working with boyle’s, charles’s, and gay-lussac’s laws? volume moles pressure temperature
The quantity the is help constant in Boyles's law is Temperature, Charles' law is Pressure, Gay-Lussac's law is number of moles.
Boyle's law states that at constant temperature the volume of the gas is directly proportional to the pressure exerted by the gas.
P α V....(i)
Charles' law states that at constant pressure the volume of the gas is directly proportional to the absolute temperature of the gas.
V α T....(ii)
Gay-Lussac's law states that for a given number of molecules of gas the Pressure of the gas is directly proportional to the absolute Temperature of the gas.
P α T....(iii)
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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 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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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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You fire a beam of light at a piece of metal and determine that electrons are emitted with 2. 0 ev of energy. You increase the wavelength of the light and determine that electrons are still being emitted. What else is true?.
The correct answer is option B: there is a decrease in the speed of the emitted electrons.
If we increase the wavelength of the light and determine that electrons are still being emitted. Then the truth is that there is a decrease in the speed of the emitted electrons.
In chemistry, the relation between the energy of a light photon and its wavelength is given by the following equation;
E = hc / λ
or λ = hc / E
Here, h is the plank's constant, 'E' represents the energy of light photons, and c is the light speed where λ indicates the wavelength of the light.
The above equation shows that the energy of photons and wavelength are inversely related to each other.
The value of energy decreases, if wavelength increases.
To put it simply, if the energy decreases then the speed and kinetic energy of the emitted electron also decrease.
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The complete question is:
You fire a beam of light at a piece of metal and determine that electrons are emitted with 2.0 eV of energy. You increase the wavelength of the light and determine that electrons are still being emitted. What else is true?
(A) there is an increase in the speed of the emitted electrons.
(B) there is a decrease in the speed of the emitted electrons.
(C) there is an increase in the number of electrons emitted.
(D) there is a decrease in the number of electrons emitted.
Why should an acid be handled with caution?
Answer:
Because they are corrosive. Acids are extremely corrosive to all body tissue, especially eyes and skin. Due to this powerful corrosiveness, acids are highly toxic.
Explanation:
describe/draw the difference between lone pairs of electrons and bonded electrons? give two examples of molecules that have both in their structure
The difference between bond pair and lone pair of electrons are :
1. Bond pair is a pair of electrons that are in a bond where as lone pair of electrons are not in a bond.
2. Bond pairs electrons are always in bonds where as lone pair of electrons are not in bonds but it can forms bond by donating the electrons.
3. In bond pair, electrons belongs to two atoms where as in lone pair, electrons belongs to the same atom.
4. Bond pair is created due to sharing of electrons where as lone pair is due to the absence of orbitals.
Two examples of molecules that have both lone pair and bond pair electrons are : ClF3, h2O
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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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6. A student adds a mixture of oil, sand and salt in a beaker of water and stirs it. The student stops stirring, and observes that the salt is no longer visible. It is also observed that the oil floats on the top and the sand sinks to the bottom of the beaker.
a. Why does oil float on water?
b. Why is salt no longer visible after the stirring?
c. How can you separate the components of this mixture?
Explanation:
a)oil floats on water because oil has less dense than the water.
b) since salt dissolve in water.
c) 1. Decantation -
Oil floats on water (oil is insoluble in water), so it can be decanted easily.
2. Filtration-
Filter the mixture and sand will be separated from the water (as it is insoluble in water), and only salt solution will be left.
3. Evaporation-
The salt solution can be evaporated, by this, the salt will separate out.
According to the law of multiple proportions, if 12 g of carbon combine with 16 g of oxygen to form co, the number of grams of carbon that combine with 16 g of oxygen in the formation of co2 is ________.
The amount of carbon combined with oxygen in order to form Carbon Dioxide(CO₂) is 12 grams
The Law of Multiple proportions is one of the basic laws in chemistry along with the Law of Definite proportion. This law was proposed by John Dalton in 1803. The law states that if two elements react to form one or more compounds then the ratio of masses of both the elements is in the ratio of small whole numbers.
It is known that Carbon can form two different compounds while reacting with Oxygen that is: Carbon Monoxide, Carbon Dioxide. For Carbon Monoxide, 12g of Carbon needs to react with 16g of Oxygen. Whereas, In Carbon Dioxide, 12g of Carbon needs to react with 32g of Oxygen. So the mass of Carbon is equal in both cases is 12g.
C(12g) + O(16g) ⇒ CO (Carbon Monoxide)
C(12g) + 2O(32g) ⇒ CO₂ (Carbon Dioxide)
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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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represent each of the following as a number between 0.1 and 1000 using an appropriate prefix: (a) 45 320 kn, (b) 568(105) mm, and (c) 0.00563 mg.
Prefix of appropriate number between 0.1 and 1000 a) 45.320MN, b) 568 hm c) 5.63ug
a) Convert to a prefix that allows the value to be between 0.1 and 1000
45, 320 kn × [tex]\frac{MN}{1000kn} = 45.320MN[/tex]
(b) 568(105) mm converting to prefix value between 0.1 to 1000
568× 10 ⁵ mm = 568 ˣ 10⁵ ˣ 10⁻³m
= 568 × 10²m
= 568 hm
(c) 0.00563 mg conversion to prefix number in between 0.1 to 1000
0.00563 ˣ 10⁻³
= [tex]\frac{5.63}{10^{6} }g[/tex]
= 5.63 × 10⁻⁶g
= 5.63ug
What is the prefix in chemistry?A prefix to the name comes before the molecule. The prefix of the molecule's name is predicated on the number of carbon atoms. for instance , a sequence of six carbon atoms would be named using the prefix hex-. The suffix to the name is an ending that's applied that describes the types of chemical bonds in the molecule.
What are the primary ten prefixes in organic chemistry?Dec is for ten carbons. The prefixes for identical groups are mono, di, tri, tetra, penta, hexa, hepta, octa, nona, and deca. Mono is never used in organic chemistry.
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The concentration of a was 0.65 m at 33 s. the initial concentration of a was ________ m.
The concentration of a was 0.65 m at 33 s. the initial concentration of a was ________ m.
What is the concentration of a solution?
The quantity of solute in a solvent is used to define the concentration of a solution in chemistry. A solution is said to have more solute when it is a concentrated solution, and it contains more solvent when it is a dilute solution. The amount of solute that has dissolved in a specific volume of solvent or solution is measured as solution concentration. The term "concentrated" refers to a solution that has a significant amount of dissolved solute.
The following reaction has a second order in [A] and a rate constant of 0.025 M-1 s-1:
A→B
Thus the concentration is 1.4m.
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the current research presents a detailed study to manufacture novel woven carbon/elium® (wel) thermoplastic composite helmets
Thermoplastics are those types of plastics that could be used several times because they could be melted and recycled.
What are thermoplastics?A plastic is a material that is produced from monomer materials. In effect, plastics are polymers. The monomeric units that compose plastics could be made from natural or synthetic sources. There are two types of plastics;
Thermoplastics
Thermosets
The thermoplastics are those types of plastics that could be used several times because they could be melted and recycled. As such, there is a lot of research into the use of thermoplastics.
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25 moles of methane gas are contained in a 20-liter container at a pressure of 30 x 105 pa. the gas temperature must be:_____.
By ideal gas approximation, the temperature of methane gas is 361.01 K.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
V = 20 L = 0.02 m³
P = 30 x 10⁵ Pa
n = 20 moles
By substituting the following parameters, we get
P . V = n . R . T
30 x 10⁵ . 0.02 = 20 . 8.31 . T
166.2T = 6 x 10⁴
T = 361.01 K
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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"
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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Why can't a cell stop normal processes during interphase
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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The mass number of an atom is equal to the total number of protons and neutrons.
is it true or false
a sheet of aluminum (al) foil has a total area of 1.000 ft2 and a mass of 3.686 g. what is the thickness of the foil in millimeters (density of al
The thickness of the aluminum foil in millimeters is 0.0147 mm
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the volume of the aluminumMass of aluminum = 3.686 gDensity of aluminum = 2.699 g/cm³Volume of aluminum =?Density = mass / volume
Thus,
Volume = mass / density
Volume of aluminum = 3.686 / 2.699
Volume of aluminum = 1.366 cm³
Divide by 28316.8 to express in ft³
Volume of aluminum = 1.366 / 28316.8
Volume of aluminum = 4.82×10⁻⁵ ft³
How to determine the thickness of the aluminum foilArea = 1 ft²Volume of aluminum = 4.82×10⁻⁵ ft³Thickness =?Volume = area × thickness
Divide both sides by area
Thickness = volume / area
Thickness = 4.82×10⁻⁵ / 1
Thickness = 4.82×10⁻⁵ ft
Multiply 304.8 to express in mm
Thickness = 4.82×10⁻⁵ × 304.8
Thickness = 0.0147 mm
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Complete question
A sheet of aluminum foil has a total area of 1.000ft2and a mass of 3.686g. What is the thickness of the foil inmillimeters? (The density of aluminum is 2.699g/cm3)
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 is 1.12.
c₁(HCl) = 2.5 M; original concentration of the solution of hydrochloric acid (HCl), before it gets diluted
V₁(HCL) = 3.5 ml; the volume of HCl to be diluted
V₂(HCl) = 100 ml; final volume of HCl after dilution.
c₂(HCl) = ?; final concentration of the solution of HCl, after dilution
c₁ · V₁ = c₂ · V₂; formula to calculate concentration of a solution
c₂(HCl) = c₁ · V₁ ÷ V₂.
c₂(HCl) = 2.5 M · 3.0 ml ÷ 100 ml
c₂(HCl) = 0.075 M
Chemical dissotiation of hydrochloric acid:
HCl(aq) → H⁺(aq) + Cl⁻(aq)
c(HCl) = c(H⁺) = 0.075 M
pH = -logc(H⁺)
pH = -log(0.075 M)
pH = 1.12; potential of hydrogen
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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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equal amounts of a pure substance undergo the following changes. which process would you predict release the greatest amount of energy
It is said that two substances are entirely miscible when they combine to create a single homogenous phase in all ratios. When two substances, like oil and water, are essentially insoluble in one another, they are said to be immiscible.
The substance present in the highest amount is the solvent in all solutions, whether gaseous, liquid, or solid, and the substance(s) present in the least amount is/are the solute (s). The solvent and the solute need not be in the same physical state, although the solvent's physical state typically dictates the nature of the solution. The solute is considered to be soluble in the solvent if they can combine to form a homogenous solution.
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