We need to do is to try 35% ethyl acetate to see the results.
What is chromatography?The term chromatography has to do with the process of separation in which there is a stationary phase and a mobile phase. The stationary phase in thin layer chromatography is the adsorbent while the mobile phase is the solvent mixture.
The solvent mixture would determine the extent of separation. We know that if the compound is polar, then we need a mixture of a polar solvent and a nonpolar solvent.
The RF of 0.9 implies that the separation was minimal. Thus, what we need to do is to try 35% ethyl acetate to see the results.
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Missing parts;
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?conclude that the sample is pure.assume that tlc will be useless and find a different way to see if the sample if pure.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.
Approximately how many times greater is the diame-
ter of an atom than the diameter of its nucleus?
Knowing that most of an atom's mass is contained in
the nucleus, what can you conclude about the density
of the nucleus?
A typical atom's diameter is 10,000 times greater than its nucleus' diameter, and the nucleus is where the majority of the mass and density of the atom are concentrated.
Nucleus :At the center of each atom, there is a tiny, dense area known as the nucleus. It has a net positive charge because it is made up of positive protons and neutral neutrons. Although the nucleus only makes up a very small portion of the atom, it is where almost all of its mass is found.
A positively charged nucleus and one or more negatively charged particles known as electrons make up an atom. The atom has no excess of electrons because the positive charges cancel out the negative charges, making it electrically neutral.
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A chemist dissolves 793 of pure nitric acid in enough water to make up of solution. calculate the ph of the solution. round your answer to significant decimal places.
pH of the given solution will be: 3
Since pH is essentially a measure of the concentration of hydrogen ions in a substance, the letters pH stand for potential of hydrogen.pH less than 7 are acidic while pH greater than 7 are alkaline.We can find out pH of a solution or substance by negative logarithm of H+ ions present in that solution.Given,
mass of nitric acid is 773mg = 0.773g
Molar mass of nitric acid is 63.01 mol
volume of solution is 180dm³
First we will obtain the concentration of Nitric acid by formula n = CV
C is the concentration
V is the volume of the solution
mass of acid is already provided in the question
we know that
no. of moles = given mass / molar mass
no. of moles of nitric acid = 0.773 / 63.01 = 0.12
C = n/V
C = 0.12 / 180 = 0.0006
We can find out pH by negative logarithm of H+ ( concentration)
pH = - log [ H+ ]
pH = - log [ 0.0006 ]
pH = 3.22 = 3
Therefore, pH of the solution is 3 (acidic)
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Enter the molecular equation representing aqueous nitric acid and aqueous ammonia reacting.
The molecular equation representing aqueous nitric acid and aqueous ammonia reacting is :
NH₃(aq) + HNO₃(aq) → NH₄⁺(aq) + NO₃⁻(aq)
NH₃(aq) + HNO₃(aq) → NH₄NO₃(aq)
An acid-base reaction is not the exchange of a hydrogen atom H. It is the exchange of a hydrogen ion (or proton) H⁺.
This reaction combines two ions produced into a single compound. In aqueous solution, the products should be NH⁴⁺ and NO³⁻, since ammonium nitrate is freely soluble in water. Thus, this reaction would be reasonable if reaction does not occur in aqueous solution.
So, the net ionic equation is,
NH₃(aq) + HNO₃(aq) → NH₄⁺(aq) + NO₃⁻(aq)
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How many kingdoms are in the domain Eukarya?
one
four
six
nine
Answer:
Four kingdoms:
The kingdoms in the domain Eukarya are Protista, Fungi, Plantae, and Animalia.
Answer: Four Kingdoms! I hope you get this question!
Explanation:
Complete the sentences that explain how you would proceed to determine the molarity of an acetic acid solution, hc2h3o2 .
The complete sentences are as follows:
To a predetermined volume of the acetic acid solution, add a few drops of Indicator.Add moles of NaOH solution with known molarity to a burette. The acetic acid solution changes color as soon as one drop of NaOH is added.Using the volume and molarity of the NaOH solution, calculate the volume that must be added to reach the endpoint. This is the number of moles of acetic acid in the sample.The molarity of the acetic acid solution is then calculated using the calculated moles of NaOH and the initial known amount of NaOH.What exactly is molarity?The molar concentration of a chemical specie in a solution, specifically the amount of a solute per unit volume of solution, is measured.
The most commonly used unit of molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.
What is acetic acid's molarity?The number of moles of the solute present in one liter of solution is referred to as molarity. In layman's terms, 1 mole equals the atomic weight of the substance. 1 mole of acetic acid, for example, is equivalent to 60.05 g of acetic acid (molecular weight = 60.05). Method of calculation: Values that are well-known Glacial acetic acid density 1.049 g/ml.
What is the purpose of acetic acid in chemical reactions?Acetic acid is also used in the chemical reaction that yields purified terephthalic acid (PTA), which is used in the production of PET plastic resin, which is used in synthetic fibers, food containers, beverage bottles, and plastic films. Solvents: Acetic acid, like ethanol, is a hydrophilic solvent.
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a liquid solvent is added to a flask containing an insoluble solid. the total volume of the solid and liquid together is 85.0 ml.85.0 ml. the liquid solvent has a mass of 44.3 g44.3 g and a density of 0.865 g/ml.0.865 g/ml. determine the mass of the solid given its density is 1.75 g/ml.
If the total volume is 85ml, then the mass of the solid is 59.15g.
Given:
Total volume = 85ml
Liquid solvent mass = 44.3g
Liquid solvent density = 0.865g/ml
Density of solid = 1.75 g/ml
Density = Mas / Volume
0.865 = 44.3 / Volume
Volume = 44.3 / 0.865
Volume = 51.2
Volume of solid = 85 - 51.2
= 33.8
Density = Mass / Volume
1.75 = Mass / 33.8
Mass = 59.15
What is mass?
A physical body's mass is the total amount of matter it contains. Inertia, or the body's resistance to acceleration when a net force is applied, is another property that may be measured. The gravitational pull of an object to other bodies is also influenced by its mass. The kilogram serves as the primary mass unit in the SI.
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Use the table of observed changes to answer the question.
Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed?
1 yes yes yes yes
2 no yes yes no
3 yes yes yes yes
4 no no no no
Which changes shown in the table are physical changes?
(1 point)
2 and 4
2 and 3
1 and 2
1 and 4
1) Chemical change
2) Physical change
3) Chemical change
4) Physical change
What is a chemical change?A chemical change occurs when a new substance is formed. There is a rearrangement of atoms of the substance as the new substance is formed. We know that the indicators that a chemical change has occurred are the changes in the temperature, color and appearance of sound sometimes.
On the other hand, when a physical change occurs, there is no rearrangement of atoms and there is no formation of a new substance. The physical appearance of the substance may change.
Now let us respond to the kind of change that happened in each case;
1) Chemical change
2) Physical change
3) Chemical change
4) Physical change
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NEED HELP ASAP FOR TEST!!
6,156,099,000,000 written in scientific notation
Answer:
6.156099 × 10^12
PLEASE HELP 30 POINTS
For the element iron
Answer: Answer
Iron is a chemical element with symbol Fe and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in front of oxygen, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust.
Explanation:
Hope this helps!
Answer:
iron:
group 8
4 orbitals
electrons per shell:2,8,14,2
26 electrons
8 valence electrons.
Explanation:
iron is in the 8th group in the periodic table because it is a transition metal and their valence shells have 8 electrons.
It has 4 electron shells because the first one can hold two electrons, the second has 8 and so on.
The total number of electrons is 26, which is equal to number of protons.
Valence electrons are in the outermost shell.
Is it an element or homogeneous
Answer: These are homogeneous elements
Explanation:
Aluminum finds application as a foil for wrapping food stuves. Why?
Answer:
it keeps the heat in and the bugs and flys out
Explanation:
Oxygen (o2) gas within a piston-cylinder assembly undergoes and expansion from a valume v1 = 0.01 m3 to a volume v2=0.03m3. the reltionship between pressure and volume during the process is p=
The initial and final pressures are 9 bar and 5 bar and work transfer is 12.5916 kJ.
To find initial and final pressure, we will keep the value of initial and final volume in the given formula.
For the case of initial pressure -
p = AV⁻¹+B
p = (0.06÷0.01)+3
p = 6+3
p = 9 bar
For the case of final pressure -
p = (0.06÷0.03)+3
p = 2+3
p = 5 bar
Now, calculating the work transfer -
The formula to be used here is -
[tex]W = \int\limits^1_2 {p} \, dV[/tex]
Keep the values in formula to find the value of work transfer -
W = [tex]\int\limits^2_1 {(\frac{0.06}{V} +3)} \, dV[/tex]
W = 0.06 (ln 0.03÷0.01)+3(0.03-0.01)
On solving the integration we get -
W = 12.5916 kJ
Hence, the initial and final pressures are 9 bar and 5 bar and work transfer is 12.5916 kJ.
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The complete question is -
Oxygen (O₂) gas within a piston-cylinder assembly undergoes an expansion from a volume V₁ = 0.01 m³ to a volume V₂ = 0.03 m³. The relationship between pressure and volume during the process is p = AV⁻¹+B, where A = 0.06 bar-m³ and B = 3.0 bar. For the O₂, determine the following:
(a) the initial and final pressures, each in bar
(b) the work, in kJ
3. draw the lewis structure for these anions. each anion is a conjugate base of an acid. (e) hco3─ (h attached to one of the o’s) (f) so32─
For lewis structure of HCO₃⁻ it has 24 valence electron and for SO₃²⁻ has 26 valence electron
A lewis Structure is a very simplified representation of the valence shell electrons in a molecule
Here given compound is HCO₃⁻ called as bicarbonate we have to draw the lewis structure of SO₃²⁻ first we have to calculate total valence electron and in that compound H=1 valence electron for C=6 valence electron and for oxygen 18 valence electron
Here, C less electronegative so 4×2=8electon are used means 24-8=16elctron
To complete octet of every element 18 electron are required one more covalent bond to be made so the structure are at one oxygen double bond are seen
In that lewis structure HCO₃⁻ of 7 lone pair=7×2=14 e and 5 covalent bond=5×2=10e total valence electron are 24
For SO₃²⁻ called suphite ion in this compound total 26 valence electron are seen 6+3(6)+2 = 6+18+2= 26 valence electron
Here in that structure sulphur has charge +1 because it has 6 valence electron out of which two are non bonding and 6 are bonding and in oxygen has -1 charge because 6 valence electron in nonbonding and 2 are in bonding
+1 on sulphur and -1 are on oxygen
That's why the lewis structure of HCO₃⁻ and SO₃²⁻ are
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How many electrons can be found with the principal quantum number n=3 in a suitably heavy atom?
There is one orbital in an s subshell with 2 electrons, three orbitals in a psubshell with 2 electrons each, and 5 orbitals in a dsubshell with 2 electrons each. The total no. of electrons is 18 (maximum).
How many electrons with the principal quantum number n 3 can be in an atom?This means the individual orbital where n = 3, l = 2 will be '3d' because 3d orbitals have five subshells and the principal quantum number is 3. - We understand that a 3d orbital can adjust 10 electrons (each subshell can house two electrons). - Therefore the no. of electrons are n = 3, l = 2 are 10.
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An irregularly-shaped piece of aluminum (Al) has a mass of 67.3 grams. What is the volume in cm³ of this piece of aluminum if its density is 2.70 g/cm³?
Answer:
Volume = 24.9 cm³
Explanation:
To calculate the volume of the piece of aluminum given its mass and density, we can use the following formula:
[tex]\boxed{{\mathrm{Volume = \frac{Mass}{Density}}}}[/tex].
We are told that the piece of aluminum has a mass of 67.3 grams and that aluminum has a density of 2.70g/cm³. Using this information and the formula above, we can calculate the volume of the piece of aluminum:
Volume = [tex]\mathrm{\frac{67.3 \ g}{2.70 \ g/cm^3}}[/tex]
= 24.9 cm³
Therefore the volume of the piece of aluminum is 24.9 cm³.
In the correct order, what are the three general steps in the mechanism of a claisen reaction?
Enolate synthesis, nucleophilic addition, and elimination are the three basic steps in the mechanism of a Claisen reaction.
What is Nucleophilic addition reaction?
A chemical molecule having an electrophilic double or triple bond combines with a nucleophile in a nucleophilic addition reaction, breaking the double or triple bond.
A nucleophile attacking the electrophile's location in the reactant molecule and displacing it to generate a product is known as nucleophilic substitution. An electrophile, which is an electron-deficient species that accepts electrons, is present in an electrophilic addition reaction.
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7.1 + 12.72 = 19.82
Explain what is wrong with this calculation.
Answer:nope its right
Explanation:
What is the major product formed upon treatment of ( r) 2-bromohexane with sodium cyanide?
In this reaction, hexanitrile will be the major product.
A nitrile is created when a halogenoalkane heated under reflux with a solution of sodium or potassium cyanide in ethanol has its halogen replaced by a -CN group. Heating under reflux is the procedure of heating with a condenser placed vertically in the flask to prevent the mixture's volatile components from escaping throughout the process. The solvent has a key role. In the presence of water, substitution by -OH rather than -CN is more probable.The substitution is an example of nucleophilic. This time, the halogenoalkane is the only species present in the reaction's slow step. It's uses both SN1 and SN2 reaction.CH₃ − CH₃(Br) − CH₃ − CH₃ − CH₃ − CH₃ + NaCN = CH₃ − CH₃(CN) − CH₃ − CH₃ − CH₃ − CH₃
Thus, the major product of reaction of 2-bromohexane with sodium cyanide is hexanitrile.
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Which type of radiation has the greatest penetrating ability?
a) alpha particle
b) beta particle
c) positron
d) gamma ray
e) all radiation has the same penetrating ability
The correct option (D) Gamma ray. The Gamma-ray has the greatest penetrating ability among alpha, beta, gamma, and positron radiation.
What is penetrating ability?The various emissions have very different levels of penetrating ability, also known as piercing power. A particle is the least incisive due to its size and slow emission. It can be blocked by a piece of paper or a human hand. Beta particles, which are more invasive than alpha particles, can be stopped by a small layer of metal.
Of the three main categories of emissions, gamma particles are the most harmful. A strong lead shield must be used to block gamma radiation. Fermions are a special case since they entirely disappear when they interact with electrons. The penetrating power of radioactive emissions is demonstrated by the generation of two 180-degree-distance gamma emissions as a result of an electron-positron collision.
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what is the increase in p2o5 concentration between 10.0 and 40.0 s ? express your answer with the appropriate units.
Average rate = - d reactant/d time + d product/d time
negative sign indicates that decrease in concentration of reactant and positive sign shows the increment in concentration of product
d represents the change in concentration, t represents time
Considering the reaction
2H3PO4→P2O5+3H2O
rate = d ( p^2o^5)/ d t
= (p^2o^5) 40 sec - (p^2o^5) 10 sec / 30
= 7.0 * 10^-3- 1.10 * 10^-3/30
rate = 2 * 10^-4m/s
2H3PO4→P2O5+3H2O
rate = - d H3PO4/2t = d ( p^2o^5)/ d t
d H3PO4/t = 2 * d ( p^2o^5)/ d t
= 2 * 2 * 10^-4
= 4 * 10^4 m/s
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a covalent bond involves: a. transferring of b. sharing protons c. transferring protons d. sharing electrons
A covalent bond involves sharing of electrons .
So, option D is correct one .
When two atoms share one or more pairs of electrons, a covalent link is created. A covalent bond is created when the difference between the electronegativities of two atoms is too small for an electron transfer to occur and produce ions.
The strongest covalent bonds are quadruple covalent bonds. The bond gets stronger the more bonding partners there are. The sharing of electrons between two species creates a covalent connection. They frequently exist between molecules with comparable electronegativities.
The strength of the bonds between the atoms is based on their quantity.
Covalent bonds can be single, double, triple, or quadruple.
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Choose the metal that is produced by electrolysis of its molten chloride salt. select one: a. mg b. ca c. sr d. ba e. all of these
The correct answer is [b] calcium is the metal that is produced by electrolysis of its molten chloride salt.
What is a metal?Metals are the opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than other elemental substances
Any of various opaque, fusible, ductile, and typically lustrous substances that are the good conductors of electricity and heat, form cations by loss of electrons, and yield basic oxides and hydroxides especially :the one that is a chemical element as distinguished from an alloy.
A metal may be a chemical element such as iron; an alloy such as stainless steel; or molecular compound such as polymeric sulfur nitride.
In physics, a metal is generally regarded as any substance capable of conducting the electricity at a temperature of absolute zero. Many elements and compounds that are not normally classified as metals become metallic under the high pressures.
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I need help with this too
The mixture of isotope to produce this average mass is is is 50% Cl-35 and 50% CI-37.
Chlorine has two stable isotopes chlorine 35, and chlorine37, with chlorine 35 accounting for about three of the four naturally occurring chlorine atoms. Chlorine 36, also known in nature, is a radioactive isotope with a half-life of about 30,000 years.
Chlorine has two stable isotopes. Cl-35 and Cl-37 with atomic weights of 34.96 and 36.95 respectively. Chlorine has an atomic weight of 35.5 instead of 35 because it has what is called an isotope.
The main difference between chlorine 35 and 37 is that chlorine 35 has 18 neutrons per nucleus while chlorine 37 has 20 neutrons per nucleus. To calculate the proportion of each isotope in a sample of an element, chemists typically divide the number of atoms of a particular isotope by the total number of atoms of all isotopes of that element and multiply the result by 100.
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How do you know when a electron transition will result in the emission of light
The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level. When the electron changes from n=3 or above to n=2, the photons emitted fall in the Visible Light region of the spectra. We call these lines Balmer's Series.
Convert 520 inches to cm using the conversion factor that 1 inch = 2.54 cm.
1320 c
O 45.59 cm
O 0.005 cm
O205 inches
Answer:
Explanation:
520:2.54=204.7 round to 205 the answer=205 cm=520 inches
I need help with this
Cu-63 and Cu-65 have 34 and 36 neutrons, respectively, in each atom. 27- Because copper has an atomic number of 29, which essentially implies that an atom of copper has 29 protons and 29 electrons, an atom of copper has a total of 29 electrons.
The stable isotope of copper is copper-63, which has a nuclear spin of 3/2, a relative atomic mass of 62.929601, and a natural abundance of 69.2 atoms. a trace element of a heavy metal having the atomic symbols Cu, 29, and 63.55. This atom has the mass number 63 because it is a copper-63 atom. Every atom of a particular element has the same atomic number, which may be determined as the element's number on the predictable.
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How much heat (in kj) is needed to convert 514 g fe2o3 into pure iron in the presence of excess carbon?
Heat is required to convert fe2o3 into pure iron. Heat required to convert 514 g fe2o3 into pure iron in the presence of excess carbon for is 753.02kJ.
What is heat?Heat is amount of energy that is transmitted because of a change in temperature from one structure to its surroundings. Heat is transition from one medium or object to another of kinetic energy, or from an energy source to a medium or object. This is amount of heat needed to increase the temperature by one degree Fahrenheit of a pound of pure liquid water.
Heat is source of energy that is transmitted (flowing from the high temperature system to the low temperature system) between systems or objects of different temperatures. It is also known as the thermal energy or heat energy. The heat is typically measured in Btu, calories or joules.
The Heat of Reaction (also known and Enthalpy of Reaction) is change in the enthalpy of a chemical reaction that occurs at a constant pressure. It is a thermodynamic unit of measurement useful for calculating amount of energy per mole either released or produced in a reaction. Since enthalpy is derived from the pressure, volume, and internal energy, all of which are state functions, enthalpy is also a state function.
2Fe2O3 (s) + 3C (s) ⇒ 4Fe (l) + 3CO2 (g)
ΔH°= +467.9kJ
Using the unitary method,
2 moles of Fe2O3 requires = 467.9kJ heat
2* 159.69g Fe2O3= 467.9kJ heat
319.38g Fe2O3 requires = 467.9 kJ heat
hence, heat required for for 514g of Fe2O3 = [tex]\frac{514}{319.38}*467.9kJ[/tex]
heat required for 541g Fe2O3 = 753.02kJ
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How is it possible to eat acidic things without changing your blood pH? Select all that apply
It is possible to eat acidic things without changing your blood pH because the body contain buffers which help to neutralize acids; option A.
What are buffers?Buffers are solutions which resist changes in their pH when small amounts of acid or base are added to it.
Buffers are prepared from a mixture of a weak acid and its salt or a weak base and it salt.
Buffers act by neutralizing acids or bases to form water.
In the body, there are natural buffers which help to keep the pH of the blood fairly constant.
The buffers found in the body include:
plasma proteins buffer system.hemoglobin buffer system.phosphate buffer, bicarbonate buffer system, andcarbonic acid buffer system.When acidic substance are taken into the body, the buffer system of the body acts to neutralize the acid to form water. Similarly, when basic food substances are taken into the body, the buffer systems in the body neutralize the bases to from water.
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Contains a variety of enzymes that can degrade proteins, amino acids, nucleic acids and carbohydrates.
Numerous enzymes that can break down proteins, amino acids, nucleic acids, and carbohydrates are found in lysosomes.
What is lysosomes?
A membrane-bound organelle called a lysosome is present in many mammalian cells. They are spherical vesicles that can degrade a wide range of biomolecules thanks to hydrolytic enzymes they carry. The proteins that make up a lysosome's membrane and lumen have a distinct makeup. The pH of the lumen, which is between 4.5 and 5.0, is ideal for the hydrolysis-related enzymes, similar to how the stomach functions.
In addition to degrading polymers, the lysosome is also involved in secretion, plasma membrane repair, apoptosis, cell signaling, and energy metabolism in cells.
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Describe two physical properties and one chemical property of the materials used for dental braces,
The physical and chemical properties of the dental braces would be listed and explained below.
What are dental braces?Dental braces are the dental devices or tools that are used for correction of abnormally developed tooth.
Wearing of dental braces can help to permanently straighten the teeth.
The physical properties of dental braces include the following:
they have abrasion and abrasion resistancethey have thermal diffusivity and coefficient of thermal expansion.The chemical properties of dental braces is that they are chemically inert leading to its ability to avoid any reaction with the wet (as well as low and high pH) environment of the mouth.
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