Try 35% ethyl acetate to see the substance present in it is more polar ,which on increasing the concentration of ethyl acetate to give a second spot.
what is ethyl acetate? is it safe for humans?The acetate ester produced when acetic acid and ethanol react is termed as ethyl acetate. It functions as an EC 3.4.19.3 (pyro glutamyl-peptidase I) regulator, a metabolite, and a Saccharomyces cerevisiae metabolite in addition to being a polar aprotic solvent. It is a volatile organic chemical, an ethyl ester, and an acetate ester.
When inhaled or absorbed via the skin, ethyl acetate can have an impact on you.Skin, eyes, noses, and throats can get irritated by ethyl acetate.Excessive exposure might make you feel lightheaded, woozy, and faint.Constant contact might lead to skin dryness and cracking.to know more about ethyl acetate visit:
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The complete question is :
You use 25% ethyl acetate (an ester) in hexane to run a tlc and obtain a single round spot with an Rf of 0.9 for the main compound. What would you do?
Try a completely different set of solvents, as ethyl acetate and hexanes will never work. Try 10% ethyl acetate to see the results. Try 35% ethyl acetate to see the results. Assume that tic will be useless and find a different way to see if the sample if pure.Conclude that the sample is pure.when ethane burns in air to form carbon dioxide and water ,heat energy is released. Explain why energy is released
Energy is released because it is a combustion reaction.
Combustion reaction -
Hydrocarbon bonds are broken during combustion events, and more energy is always released during the formation of water and carbon dioxide bonds than was consumed to break the initial hydrocarbon bonds. Burning materials that are primarily made of hydrocarbons produces energy because of this. This is an exothermic reaction.
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O + Heat
(ethane)
In the process of burning, or combustion, the reactant takes up oxygen and oxidizes it, releasing energy in the form of heat and light. It happens quickly. Along with the energy created during burning, carbon dioxide and water vapor are also produced.
Hence heat and light which are forms of energy are released during combustion reaction.
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The warmth felt next to a hot fire is mainly due to what in science
Answer: thermal radiation
Explanation:
What is true about these atoms and molecules?
O All of these are molecules
O B and Care atoms; A, D and E are molecules
O A, D and E are atoms; B and C are molecules
O A and D are atoms; B, C and are molecules.
Answer:
Tbh it doesn't look right because A D are atoms B E C are molecules.
Explanation:
The reason I think that is because E is the molecule of elements while B and C are molecules of compounds can you maybe recheck?
The energy flow to the earth from sunlight is about 1.4 kw>m2 . (a) find the maximum values of the electric and magnetic fields for a si- nusoidal wav
The maximum values of the electric and magnetic fields is 3.42*[tex]10^{-6}[/tex] T.
What is the electric and magnetic field?Electric fields arise from the electric charges and changing magnetic fields.
An electric charge, or collection of the charges, will have an associated electric field. Any charged object placed in this field will experience an electrostatic force as field interacts with the charge of the object. Field lines represent force a positively charged particle would experience if it were in the field at that point.
A changing magnetic field can also cause the electric charges to move. This phenomenon is commonly used in the electric generators to induce electric currents in wires. The induced current can be increased by causing the larger changes in the magnetic field or by coiling the wire so that more wire is affected by the changing magnetic field.
Magnetic fields arise from the permanent magnets and electric charges in motion.
Magnets can occur naturally (such as the Earth’s magnetic field), or they can be made by magnetizing the ferromagnetic materials.
Intensity I = 1.4*[tex]10^{3}[/tex] w/[tex]m^{2}[/tex]
Total Energy density [tex]U_{avg}[/tex] = [tex]\frac{1}{2} E_{o}E_{o} ^{2}[/tex]
a) energy density = I/C
Therefore, 1/2 [tex]E_{o}E_{o}^{2}[/tex] = I/C
1/2 * 8.85 * [tex]10^{-12}[/tex] * [tex]E_{o}^{2}[/tex] = 1400/(3*[tex]10^{8}[/tex])
[tex]E_{o} ^{2}[/tex] = 105.46*[tex]10^{4}[/tex]
[tex]E_{o}[/tex] = 10.27*[tex]10^{2}[/tex] N/C
[tex]B_{o}[/tex] = [tex]\frac{E_{o} }{C}[/tex] = (10.27*[tex]10^{2}[/tex])/ (3*[tex]10^{8}[/tex]) = 3.42*[tex]10^{-6}[/tex] T
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Draw a typical hydrogen bond which might be formed for any you specify. a. chlorobenzene b. 1-butanol c. hexane d. ethyl alcohol
1- butanol and (d) ethyl alcohol.
What is a hydrogen bond?Not a covalent link to a hydrogen atom, hydrogen bonding is an unique kind of dipole-dipole interaction between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.Individual water molecules are drawn to one another as a result of the polarity of water. One water molecule's positively charged hydrogen side is drawn to the negatively charged oxygen side of another water molecule nearby. It is known as a hydrogen bond to describe this attraction.A great example of a hydrogen bond is water. Instead of being between the two hydrogen atoms, the connection is between the oxygen atoms in two different water molecules (a common misconception).1- butanol and (d) ethyl alcohol.
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The smaller triangle is a pre-image of the bigger triangle. The center of dilation is (2, −1).
What is the scale factor used to create the dilation?
By using rule for dilation, scale factor used to create the bigger triangle will be (-2) when the small triangle is a pre- image.
Coordinates of a point (x, y) dilated by a scale factor 'k' about a point (a, b) is given by,
Coordinates of the image point → [k(x - a) + a, k(y - a) + b]
Point of dilation → (2, -1)
Vertices of the smaller triangle (preimage) → (-1, -1), (2, 2) and (2, -1)
Corresponding vertices of the bigger or dilated triangle → (8, -1), (2, -7) and (2, -1)
By the rule of translation,
Image of vertex (-1, -1) → [k(-1 - 2) + 2, k(-1 + 1) - 1]
→ [(-3k + 2), -1]
image of the point (-1, -1) is (8, -1).
Therefore, (-3k + 2) = 8
-3k = 8 - 2
k = -2
Hence, scale factor used to create the dilation will be (-2).
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Choose the best description for prokaryotic cell.
has a nucleus; found in multicellular organisms
has no nucleus; found in unicellular organisms
has no nucleus; found in multicellular organisms
has a nucleus; found in unicellular organisms
Answer:
has no nucleus; found in unicellular organisms
Explanation:
Hope It Helps
Sorry If I'm Wrong
Answer: Has no nucleus found in unicellular organisms
Explanation:
Prokaryotic cells are primitive cells found in lower organisms. Prokaryotic cells do not have a true cell.
A true nucleus lacks an envelope which contains the nuclear materials.
Most of the organelles lacks membrane bound organelles.
The true nucleus is lacking in prokaryotes.
Eukaryotic cells have true nucleus.
identify each described physical separation technique. a liquid is carefully poured out, leaving the solid behind in the container
A liquid is gently poured out, leaving the solid in the container, in a process known as decantation.
What is decantation?
The process of decanting is used to separate mixtures of incompatible liquids or liquid and solid mixtures, such as suspensions. The liquid that is closer to the top of the container—the less dense of the two liquids or the liquid from which the precipitate or sediment has settled out—is poured off, leaving the other component or the denser liquid of the mixture behind.
During the separation of two immiscible liquids, an imperfect separation is observed. Decantation, to put it simply, is the process of shifting the top layer of immiscible materials to another container in order to separate the contents.
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When an electrical utility charges higher prices during the day than at night, it is practicing:______.
When an electrical utility charges higher prices during the day than at night, it is practicing is peak load pricing.
What is peak load pricing?The demand for the many goods is larger during certain times of the day or week. For example, the roads are congested during rush hours during the morning and evening commutes. Electricity has larger demand during day than at night. Ski resorts have large (peak) demands during weekends, and smaller demand during the week.
Economic efficiency is greatly improved by charging the higher prices during peak times. If utility were required to charge a single price at all times, it would lose ability to charge consumers an appropriate price during peak demand periods. Charging higher price during peak hours provides an incentive for consumers to switch consumption to off-peak hours. This saves the society resources, since costs are lower during those times.
An example is an electricity consumption. If consumers are charged higher prices during the peak hours, they are able to shift some electricity demand to night, the off-peak hours. Dishwashers, laundry, and the bathing can be shifted to off-peak hours, saving the consumer money and saving society resources. Electricity companies also promote the “smart grid” technology that automatically turns thermostats down when individuals and families are not at home… saving the consumer and society money.
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Electrochemical forces: if the sum of chemical and electrical driving forces is stronger, then it ____ pushes potassium out of cell rather than into the cell
Potassium will be forced out of the cell rather than into it if the combined strength of the chemical and electrical driving forces is greater.
The electrical potential gradient across the cell membrane and the concentration gradient of the permeant ion across the membrane together make up the net electrochemical driving force. The net driving force can be altered by changing either one. The potential difference across the cell membrane is known as the membrane potential of a cell, which is calculated as the inside potential minus the outside. It happens as a result of the cell membrane's ability to separate charges.
A cell's electromotive force (EMF) The highest potential difference between any two electrodes in a cell is known as the EMF.
Electrochemical forces: If the combined strength of the chemical and electrical driving forces is greater, potassium will be pushed out of the cell rather than into it.
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What is the mass of 1.00 mole of an unknown compound with the formula xy if the molecular weight of x is 35.67 g and the molecular weight of y is 40.59 g?
The mass of one mole of this unknown compound 'XY' is 76.26gm.
Given here, the 1 mol of unknown compund 'XY' and mass of X and Y are 35.67gm and 40.59 gm respectively.
Molar mass of XY = molar mass of X + molar mass of Y=35.67gm + 40.59 gm = 76.26gm.
We can find given mass of 'XY' compound by formula,
Mole = Given mass/Molar mass
1= Given mass /molar mass
Given mass = molar mass.
Given mass = 76.26gm.
So, the given mass of XY is equals to 76.26gm.
Mole is defined as the unit of amount of substance. The quantity of amount of substance is measured in mole as 1mol contain exactly 6.023×1023 particles or entities. Mole is calculated by the ratio of the given mass and the molecular mass of the compound.
The relation of mole and molarity is given by the formula, Molarity is equals to no. of moles of solute divided by the solution in litres. S.I unit of molarity is moles per litre.
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The _______ gland releases the hormone adrenaline.
Answer:
adrenal
Explanation:
The adrenal glands. (I kid you not)
You take out your best silver spoons and
notice that they
are very dull and have
some black spots.
Is it a chemical change or physical and why?
Elements on the LEFT side of the periodic table will
most likely form:
Positive ions
None of these
a piece of sulfur weighs 227 g. when it was submerged in a graduated cylinder containing 50 ml of water, the level rose to 150 ml. what is the density (g/ml) of the sulfur?
The density is = 2.27 g/ml.
A certain object's mass in relation to its volume is measured by its density. High density is a term used to describe materials that are exceedingly compact and have a high mass.
What is density ?A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the definition of density in mathematics:
row = m/V
where is the density, m is the mass, and V is the volume.
Given in the question:
Mass of piece of sulfur= 227g
The volume of water that has been disoplaced= (150-50)mL =100mL
We can find the density by:
Density = Mass/Volume
Density = 227/100
Density = 2.27 g/ml
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Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. a) trueb) false
Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. The above statement is true.
What are catalytic converters?An internal combustion engine's exhaust gas includes poisonous gases and other pollutants that a catalytic converter converts into less-toxic pollutants by accelerating a redox reaction. Typically used with internal combustion engines driven by gasoline or diesel, including lean-burn engines, catalytic converters are also occasionally utilized with kerosene heaters and stoves.Catalytic converters are used to reduce tailpipe emissions of unburned hydrocarbons and carbon monoxide is reduced and recycled.Although catalytic converters are most frequently employed in the exhaust systems of cars, they can also be found in forklifts, mining machinery, trucks, buses, locomotives, motorbikes, and ships.To minimize pollutants, they are even applied to some wood burners. Usually, this is a reaction to governmental regulation, such as environmental control or health and safety requirements.Learn more about catalytic converters from the given link
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The molecular geometry of the ammonium ion, nh4 , is most similar to the molecular geometry of:________
The chemical structure of the ammonium ion, NH4, resembles that of CH4 the most.
What is tetrahedral geometry?
When there are four bonds and no lone pairs in the core atom of the molecule, the molecule is said to be tetrahedral. With 109.5° angles between them, the atoms that are bound to the core atom are positioned at its four corners.
A central atom in tetrahedral molecular geometry is situated in the middle of the four substituents that make up the corners of the tetrahedron. Complexes with metals in the d0 or d10 electron configuration frequently have tetrahedral shape.
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Calculate the final ph of a solution made by the addition of 10 ml of a 0.5 m naoh solution to 500 ml of a 0.4 m ha originally at ph = 5.0 (pka = 5.0) neglect the volume change.
The final pH of a solution is 5.02 made by the addition of 10 ml of a 0.5 m NaOH solution to 500 ml.
What is pH?
The primary pH standard values are calculated using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. With the use of a glass electrode, a pH meter, or a color-changing indicator, the pH of aqueous solutions can be determined. In chemistry, agronomy, medicine, water treatment, and many other fields, pH measurements are crucial.
A scale called pH is used in chemistry to describe how basic or acidic an aqueous solution is. Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.
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suppose that an element has two isotopes. the average atomic mass of the element is 48.184 u48.184 u . one isotope has a mass of 42.450 u42.450 u and an abundance of 35.385.38% . calculate the mass of the second isotope.
The mass of the second isotope is 49.08 u.
Average atomic mass is 45.737 u, while the abundance of isotope 1 is 40.149 u.
? isotope 2?
Process
1.- Determine the isotope 2 abundance: abundance isotope 1 plus abundance isotope 2 equals 100%
100 = 37.46 + abundance isotope 2
Amount isotope 2 equals 100 - 37.46 Amount isotope 2 equals 62.54
2.- Determine the mass of isotope 2. Average atomic mass = (abundance x mass isotope 1) + (abundance x mass isotope 2) 45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2) Mass isotope 2 = [45.737 - (0.3746 x 40.149)]
62.54 mass isotope 2 equals [45.737 - 15.0398] 62.54 mass isotope 2 equals 30.6972 62.54 mass isotope 2 equals 0.4908 x 100 mass isotope 2 equals 49.08 u
What is an isotope ?Isotopes are members of the same family of elements as that element but have varying numbers of neutrons. The Periodic Table's atomic number of an element is determined by the number of protons it contains. The atomic number 6 of carbon, for instance, has six protons.
Any of two or more types of chemical element atoms that have the same atomic number and essentially the same chemical behavior, but different atomic masses or mass numbers and different physical qualities
Uranium-235, uranium-238, tritium (hydrogen-3), chlorine-36, and carbon-14 are a few examples of radioactive isotopes. There are certain isotopes that have exceptionally lengthy half-lives (in the order of hundreds of millions of years). Stable nuclides or stable isotopes are the terms used to describe these isotopes.
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1.15(a) a gas at 250 k and 15 atm has a molar volume 12 per cent smaller than that calculated from the perfect gas law. calculate (a) the compression factor under these conditions and (b) the molar volume of the gas. which are dominating in the sample, the attractive or the repulsive forces?
(a)The gas has a compressibility factor of 0.88 and a molar volume of 1.204 litre mol-1.
(b)The gas has a 1.12 compressibility factor and occupies a 2.682 litre mol^-1 molar volume.
What is compressibility factor?
The compressibility factor (Z), often referred to as the compression factor or the gas deviation factor, is a term used in thermodynamics to describe how a real gas deviates from the behavior of an ideal gas. The molar volume ratio of a gas to an ideal gas at the same temperature and pressure is the simplest way to describe it.
(a) compressibility factor (Z)= Vm/Vmo
where Vm is the molar volume and molar volume molar volume Vmo
putting the values we get :
Vm = 0.88 Vmo
Z= 0.88
therefore Vm = 0.88 x 0.0821 x 250 /15 litre mol^-1
(b) similarly we can calculate
Vm = Vmo + 0.12 Vmo
Therefore, after putting the values Z= 1.12
Vm= 1.12 x 0.0821 x 350 /12 litre mol^-1
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in a liquid–liquid extraction, a layer can form between the aqueous and organic layers if the separatory funnel is shaken too vigorously. select the name of this layer. carbonation a gas–liquid interface an emulsion a supercritical fluid
Liquid - Liquid Extraction - It a separation process comprising of the movement of a solute from one solvent to another, the two solvents being not mixable or partially mixable with each other.
Also known as solvent extraction
Organic layer is found to be at the bottom (more dense as compare to water) and aqueous layer found on the top (organic layer less dense as compared to water) in the given liquid liquid extraction.
To find which layer in we can easily add distilled water to the funnel. Whatever layer increases in size must be the aqueous layer and the other is the organic layer.
We can also do the water drop test regarding the same.
Supercritical fluid manages all the different parameters such as temperature, pressure etc.
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An irregular object has a mass of 125.5 grams. A graduated cylinder is filled to 61.0 mL and the irregular object is dropped in and it rises to 71.0 mL. Find the density.
Explanation:
density=mass÷volume
volume of irregular object= 71-61= 10 mL
density=125.5÷10
density= 12.55g/mL
Which phenomenon is most likely due to the high specific heat capacity of water?
Due to the large specific heat capacity of water, Santa Monica Bay, off the coast of Los Angeles, experiences less seasonal temperature variation than the surrounding air.
What is specific heat capacity?
The amount of heat required to increase a substance's temperature by one degree Celsius (°C) in one gram is known as specific heat. Water has a high specific heat, which means that heating it up requires more energy than heating up other substances.
Specific heat capacity (symbol: c) in SI units is the quantity of heat in joules needed to elevate 1 gram of a substance by 1 Kelvin. J/kgK is another way to put it. It is also possible to express a specific heat capacity in terms of calories per gram of temperature in Celsius.
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Assuming each measurement can be made to /- 0.05 ml, what is the percentage error in using a buret to deliver 40.0 ml of solution into an erlenmeyer flask?
The percentage error in using a buret to deliver 40.0 ml of solution into an erlenmeyer flask is 0.13%.
Given,
Theoretical value = 40ml
Experimental value = (40-0.05)ml = 39.95ml
%Error = |Experimental value - Theoretical value| / |Theoretical value| x 100
= |39.95 - 40| / |40| x 100
= 0.0499999 / 40 x 100
=0.00125 x 100
=0.125.
%Error = 0.13.
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when one molecule of sucrose is burned with oxygen to make carbon dioxide and water, how many carbon dioxides are made? hint, carbon dioxide is co2.
One molecule of sucrose is burned with oxygen to make carbon dioxide and water.
What is sucrose?
The components of the disaccharide sugar sucrose are glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C12H22O11 is the chemical formula for it.
To extract and refine sucrose for human use, either sugarcane or sugar beet are employed. Crushing the cane creates raw sugar, which is subsequently delivered to other sectors to be refined into pure sucrose. Sugar mills are usually located in tropical regions near to sugarcane plantations.
C12H22O11 + 12O2 = 12CO2 + 11H2O
When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.
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Is it possible to prepare (s)-2-bromo-3-methylbutane in high yield by halogenation of an alkane?
When doing integrated rate law calculations for second order reactions, we are assuming a rate law that resembles:______.
The rate of such a reaction can be written either as r=AB OR r=A2
Since the, second order reactions can be of two types described below, rate can be given by
r=A×By
It is a chemical reaction in which rate of reaction is proportional to the concentration of each of two reacting molecules.
How do you demonstrate that a reaction is second order?Initial Speed (M/s)
Determine the order of the reaction and the rate constant. If the plot of reactant concentration versus time is not linear but the plot of 1/reaction concentration versus time is linear, the reaction is of second order.SECOND ORDER REACTIONS
Second order reactions are chemical reactions in which the sum of exponents in the corresponding rate law of the chemical reaction equals two. Nitrogen dioxide decomposes into nitrogen monoxide and an oxygen molecule as an example of a second order reaction.Second-order reactions can also occur when the reactants are identical and form a product. Many reactions occur, including nitrogen dioxide decomposition, alkaline hydrolysis of ethyl acetate, hydrogen iodide decomposition, and the formation of double-stranded DNA from two strands.To learn more about SECOND ORDER REACTIONS refer to
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identify the conjugate base for each acid. conjugate base of h3po4 : conjugate base of hs− : conjugate base of nh 4
The conjugate base of the acid Nh4+ is ammonia NH3.
What is conjugate base?
A conjugate base is the base member, X-, of two compounds that convert into one another by acquiring or losing a proton, according to a more comprehensive definition. In a chemical process, the conjugate base has the capacity to either gain or absorb a proton.
The conjugate base's formula is the acid's formula less one hydrogen. The base that reacts changes into its conjugate acid. The conjugate acid's formula is the base's formula plus one hydrogen ion.
Because it gives an H+ ion to the water, NH+4 is the acid. After that, it turns into ammonia (NH3), which is the conjugate base of NH+4.
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When a reaction is properly refluxing, where should you see the vapors from the heated mixture? select one:
Vapours should be contained to the reaction flask.
What is properly refluxing?
Reflux is the process of heating a chemical reaction for a predetermined period of time while steadily employing a condenser to cool the resulting vapour back into liquid form. The condensation of the vapours created above the reaction results in their constant return to the flask as a condensate.
Therefore,
When a reaction is properly refluxing, where should you see the vapors from the heated mixture
Vapours should be contained to the reaction flask.
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a certain ore is 27.9'.9% nickel by mass. how many kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel?
A certain ore is 27.9'.9% nickel by mass. - 28544692. kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel.
What is nickel ?Chemical element nickel has the symbol Ni and atomic number 28. It is a beautiful silvery-white metal with a faint golden hue. The transition metal nickel is hard and ductile. Although bigger particles of pure nickel are slow to react with air under typical conditions because an oxide layer builds on the surface and limits further corrosion, pure nickel that has been powdered to increase reactive surface area exhibits high chemical activity (passivation).
Yet pure native nickel is only occasionally found in the crust of the Earth, typically in ultramafic rocks and the interiors of bigger nickel-iron meteorites that were not exposed to oxygen during their time outside the Earth's atmosphere.
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