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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What is the molar solubility of marble (i.e., [ca2 ][ca2 ] in a saturated solution) in normal rainwater, for which ph=5.60ph=5.60 ?
the molar solubility of marble (i.e., [ca2 ][ca2 ] in a saturated solution) in normal rainwater, for which Ph=5.60ph=5.60 is 0.0142.
What do you mean by saturated solution?A saturated solution is a solution that contains maximum amount of solute that can be dissolved under the condition at which the solution exists.
In chemistry, after studying solutions and properties of solution, one can understand that a solution can reach a status of saturation. This state is when solution has reached a point in which no more solute can be added. Addition of solute after this point would result in solid precipitate or gas being released. Such mixture is called a saturated solution.
Ksp of(CaCO3)= 4.5 x 10 -9
Ka1 for (H2CO3) = 4.7 x 10^-7
Ka2 for the (H2CO3) = 5.6 x 10 ^-11
1) The equation 1 for Ksp = 4.5 x 10^-9
CaCO3(s)→ Ca +2(a q) + CO3-2(a q)
2) The equation 2 for Ka1 = 4.7 x 10^-7
H2CO3- + H2O → HCO3- + H3O+
3) equation 3 for Ka2 = 5.6 x 10^-11
HCO3-(a q) + H2O(l) → CO3-2 (a q) + H3O+(a q)
so, form the equation 1& 2&3 we can get the overall equation:
CaCO3(s) + H+(a q) → Ca2+(a q) + HCO3-(a q)
note: you could get the overall equation by adding the equation 1 to the inverse of equation 3 as the following:
when inverse of equation 3 is :
CO3-2 (a q) + H3O+ (a q) ↔ HCO3- (a q) + H2O(l) Ka2^-1 = 1.79 x 10^10
when we add it to the equation 1
CaCO3(s) ↔ Ca2+(a q) + CO3-2(a q) Ksp = 4.5 x 10^-9
∴ overall equation will be as we have mentioned before:
when H3O+ = H+
CaCO3(s) + H+(a q) ↔ Ca2+ (a q) + HCO3-(a q) K= 80.55
from overall equation:
∴K = [Ca2+][HCO3-] / [H+]
when we have [Ca2+] = [HCO3-] we can assume both = X
∴K = X^2 / [H+]
when we have the PH = 5.6 we can get [H+]
PH = - ㏒[H+]
5.6 = -㏒[H]
∴[H] = 2.5 x 10^-6
so, by the substitution on K expression:
∴ 80.55 = X^2 / (2.5 x10^-6)
∴X = 0.0142
∴[Ca2+] = X = 0.0142.
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How much carbon (C) is in 1.41 × 10^22 atoms
of carbon?
Answer in units of mol.
Taking into account the definition of Avogadro's Number, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of carbonYou can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 1.41×10²² atoms are contained in how many moles of carbon?
amount of moles of carbon= (1.41×10²² atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of carbon= 0.02341 moles
Finally, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.
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Suppose the United States adopted the international standard for
letter-sized paper. Explain at least two things that might result from this change
Answer:
. In the United States, a standard letter-sized piece of paper is 8.5 inches wide by 11 inches long. The international standard for a letter-sized piece of paper is different. The international standard is based on SI units: 21.0 cm wide by 29.7 cm long. a. Convert 21.0 cm to inches. Show your dimensional analysis setup. b. Convert 29.7 cm to inches. Show your dimensional analysis setup. c. State the dimensions, in inches, of the international standard for a letter-sized piece of paper. d. Which piece of paper is longer: a U.S. letter-sized piece of paper, or an international letter-sized piece of paper? e. Suppose the United States adopted the international standard for letter-sized paper. Explain at least two things that might result from this change
if you have a properly adjusted flame, which is pale blue, what is observed if the gas control valve is slightly closed
When there is less natural gas, a luminous flame will appear.
A luminous flame is one that produces more light from a fuel source with inefficient combustion. In other words, there is not enough oxygen available for stoichiometric combustion when combustion occurs. For more effective combustion, this emits light that is more in the yellow-orange range of the visible light spectrum as opposed to a more blue-nearly colorless region.
An acetylene torch is a good illustration of luminous falme because the first ignition is normally carried out in the presence of only acetylene, which produces a very sooty, bright, yellowish-red flame. The flame receives more of the necessary oxygen for effective combustion when the oxygen valve is opened, and the flame changes color to blue.
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a sample of oxygen gas that occupies 0.679 m3 exerts a pressure of 36 kpa at a temperature of 293 k (absolute temperature measured on the kelvin scale). find the value of k (in kpa · m3) in the given model.
The value of k is 24.44 kPa[tex]m^{3}[/tex] using the given model of pressure and volume .
Given data,
P= 36kPa
V = 0.679[tex]m^{3}[/tex]
According to the given model,
P = k/V
where, P = pressure in kPa
V = volume occupied by gas
k = proportionality constant
Plugging in the values in the respective model we get,
P = k/V
36 = k/0.679
k = 24.44 kPa[tex]m^{3}[/tex]
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Which element has similar properties to neon (Ne)?
O Chlorine (CI)
O Selenium (Se)
O Krypton (Kr)
O Bromine (Br)
Answer:
Krypton
Explanation:
They're both inert gases
"4s2 is the amount of energy in the atom"
Using the terms energy level, sub level, number of electrons explain WHY this misconception is incorrect and what "4", "s" and "2" represent in electron configurations.
The shell is spherically symmetrical orbital and two electrons are found in the N shell of the atom.
What is electron configurations?The electron configuration is defined as the manner in which the electrons are arranged in an atom. The electron present in an atom are arranged in subshells and shells. The shells are choose according to the principal quantum number in which the subshells are taken by the orbital quantum number.
The orbital in which the electron is found has a direct relation to the energy of the electron.
Thus, we concluded that the "4s^2" refers that it is spherically symmetrical orbital and the two electrons are found in the N shell of the atom.
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What type(s) of bonding would be expected for each of the following materials: brass (a copper-zinc alloy), epoxy, barium sulfide (bas), solid xenon, bronze, nylon, and aluminum phosphide (alp)?
The bonding expected for each material is covalent ,ionic and metallic bonds .
About bonds :
The force of attraction that leads to holding of atoms or ions together in a molecule or crystal is said be bonding. Bond formation can happen by either attraction or transfer of electrons. There are single, double, and triple bonds. There are many sorts of bonding namely:
Covalent (sharing of electrons takes place).
Ionic (transfer of electrons takes place)
Metallic (ionized atoms of metals and therefore the sea of electrons around them).
Brass (a copper-zinc alloy)
Brass is an alloy of metal that's copper and zinc. Hence, the metallic bonding is present within the brass.
Rubber
It is a polymer whose monomer unit is isoprene, which may be a covalent compound. The isoprene units are attached in repeated units to make rubber by covalent bonding.
Barium sulfide ()
Due to the large electronegativity difference between barium and sulfur, barium sulfide is an ionic compound. Thus, ionic bonding is present in barium sulfide.
Solid xenon
Only xenon atoms are present in solid xenon which are interacted by weak Van der Waal's interactions.
Bronze
Bronze is an alloy of metal that's copper and tin. Hence, the metallic bonding is present within the brass.
Nylon
It is a polymer whose monomer unit is caprolactam, which may be a covalent compound. The caprolactam units are attached in repeated units to make nylon by covalent bonding.
Aluminum phosphide ()
Aluminum phosphide may be a covalent compound and thus involves covalent bonding.
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Chemists use the letters of the alphabet as what for the elements?
Answer:
As a Symbol
Explanation:
questionyou heat two substances, a and b. both substances change color. when cooled, both substances return to their original colors.what most likely happened in this situation?
Two substances, a and b were heated. Both substances change color. when cooled, both substances return to their original colors.
What is a physical change?
A physical alteration only affects the object's shape; the object's interior structure (its molecules) remain unaltered. It is possible to change the created element back into the original thing. A alteration that can be undone is reversible. The condition, shape, or size of an object can change due to a physical change.
Here, since after heating both the substances a and b change colour and again on cooling return back to their original form (previous colour), thus we can conclude that a physical change occurs in them on heating which reverts back on cooling, being a reversible process.
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How many moles of sucrose (m = 342.3 g/mol) are there in 25 ml of a 0.551 g/l solution of sucrose?
Molarity of sucrose = 0.116 M .
Volume of solution = 0.5 liter
Mass of sucrose in gram = 20 gram
Molar mass of sucrose 342.3 g/mol
Molarity of sucrose
Computation:
Mole of sucrose = Mass of sucrose in gram / Molar mass of sucrose
Mole of sucrose = 20 / 342.3
Mole of sucrose = 0.058 (Approx.)
Molarity of sucrose = Mole of sucrose / Volume of solution
Molarity of sucrose = 0.058 / 0.5
Molarity of sucrose = 0.116 M
What is Molarity ?A substance's molarity (M) is the volume of solution in which it is present. The amount of a solute in moles per liter of a solution is known as molarity. A solution's molar concentration is another name for molarity.
The amount of solute in one mole per liter of solution is known as molarity. For instance, when table salt is dissolved in water, the solute is salt, and the solution is water. 58.44 grams make up one mole of sodium chloride. One molar solution, often known as 1M, is created when 58.44 grams of sodium chloride are dissolved in one liter of water.
The quantity of solute in one mole of solution per liter is known as molarity.
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What form of carbamate is used mainly as an herbicide? a. carbaryl b. metam sodium c. thiocarbamate d. dithiocarbamate e. none of these is correct.
The form of carbamate mainly used as a herbicide is dithiocarbamate.
The esters of carbamic acid is are known as Carbamate compounds. They are mainly used as insecticides and referred as N-methylcarbamate. The general formula for RHNCOOR'. Carbamate compounds are highly soluble in water, polar and are chemically reactive. Carbamates can be easily hydrolyzed, they have low level of persistence in soil as well as water.
Dithiocarbamates are the small group of organic molecules. They have been extensively used in agricultural industry for more than 50 years. They have strong chelating ability for inorganic species and have anti-oxidant property. Molecular weight of dithiocarbamate is 171.26.
Carbon disulfide with ammonium or either primary/secondary amine gives Dithicarbamates in presence of NaOH or amine. The reaction is an exothermic reaction.
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a container filled with 45 kg of liquid water at 95°c is placed in a 90-m3 room that is initially at 12°c. thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room. using constant specific heats, determine (a) the final equilibrium temperature, (b) the amount of heat transfer between the water and the air in the room, and (c) the entropy generation. assume the room is well sealed and heavily insulated.
Thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room.
Option B is correct
What is Thermal equilibrium?
If there is no net transfer of thermal energy when two physical systems are connected by a heat-permeable route, then they are in thermal equilibrium. Thermal equilibrium is in accordance with the first law of thermodynamics.
When a system's internal temperature is both uniformly distributed and stable over time, it is considered to be in thermal equilibrium with itself. Systems that are in thermal equilibrium are always in systems that are in thermodynamic equilibrium, while the reverse is not always true.
The two systems may reach thermal equilibrium without achieving thermodynamic equilibrium if the connection between them allows the transfer of energy as a "change in internal energy" but not the transfer of matter or energy as work.
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If solutions of ba(oh)2 and feso4 are mixed, how many precipitation reactions will occur?
2 precipitation reactions will occur.
A "chemical reaction occurring in an aqueous solution when two ionic bonds combine, yielding the creation of an insoluble salt" is what is meant by the term "precipitation reaction." Precipitates are the insoluble salts created during precipitation reactions. Precipitation reactions are often double displacement events that result in the formation of the precipitate, a solid form of residue.
The creation of insoluble salts that precipitate out of the solution results from these reactions when two or more solutions with various salt concentrations are mixed. The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt.
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What is the boiling point of the automobile radiator fluid prepared by mixing 1.09 l of ethylene glycol (hoch2ch2oh, density = 1.114 g/ml) with 1.16 l of water (density = 1.000 g/ml)?
Final temp = 108.05.
What is Density? The relationship between a substance's mass and the amount of space it occupies is known as its density (volume). The density of a substance is determined by the mass, size, and arrangement of its atoms. Density (D) is defined as the product of a substance's mass and volume.For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au). Styrofoam blocks are less dense than bricks. Mass per unit volume serves as its definition.Definition of density: A material's density is determined by how closely it is packed. As the mass per unit volume, it has that definition.What is the boiling point of the automobile radiator fluid prepared by mixing 1.09 l of ethylene glycol (hoch2ch2oh, density = 1.114 g/ml) with 1.16 l of water (density = 1.000 g/ml)?
Delta T = 1*.52*1000*1.114*1000/1160*62
=8.05 deg C
final temp = 108.05
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the equilibrium of 2h 2 o(g) 2h 2 (g) o 2 (g) at 2,000 k has a k eq value of 5.31 x 10 -10 . what is the mass action expression for this system?
The mass expression for the system is K= (aH₂)² × aO₂ / (aH₂O)² = 5.31× 10⁻¹⁰.
First, we have to write a balanced chemical equation, i.e
2H₂O(g) ⇄2H₂(g)+O₂(g)
Now, from the above equation we can write mass action expression,
K= (aH₂)² × aO₂ / (aH₂O)² = 5.31× 10⁻¹⁰.
The mass action law provides simple method to write the expression for the equilibrium constant of any reaction. it is a universal law and applicable to all chemical reactions.
The ratio of the concentrations of the reactants and products is known as Equillibrium constant. It is represented as (K).
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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 weight of carbon that combines with 16 g of oxygen in the formation of CO2 is 12 g.
The law of multiple proportions was given by Dalton in 1803.
According to this law, when two elements combine to form more than one compound, the masses of one element that combine with a fixed amount of another element, are in the ratio of whole numbers.
For example,
hydrogen combines with oxygen to produce two compounds, water(H₂O) and hydrogen peroxide(H₂O₂).
Hydrogen + Oxygen ⇒ Water
2 g 16 g 18 g
Hydrogen + Oxygen ⇒ Hydrogen Peroxide
2g 32 g 34 g
Similarly, carbon also reacts with oxygen to form two different compounds, carbon dioxide(CO₂) and carbon monoxide(CO).
Carbon + Oxygen ⇒ Carbon Dioxide
12 g 32 g 44 g
Carbon+ Oxygen ⇒ Carbon Monoxide
12 g 16 g 28 g
Thus, the weight of carbon that combines with 16 g of oxygen in the formation of CO₂ is 12 g.
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someone pls explain how I do this work
Answer:
Explanation:
Element #of protons Mass #. # of electrons Atomic #. Neutron
Se. 34. 78.96. 34 34 45
Si. 14. 28. 14. 14 14
H. 1. 1. 1 1 0
Ca. 20. 40.078. 20. 20. 21
Fe. 26. 56. 26. 26. 30
Na. 11. 23. 11. 11. 12
Igneous rock is where new rock is formed from molten
Answer:
Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.
Explanation:
7. When an astronaut travels from the Earth to the Moon, which of their physical properties changes: mass or weight?
Explain why one property changes but the other does not.
Answer:
the weight
Explanation:
becouse the moon has less mass then earth the gravitational attraction on the Moon is much less than it is on Earth since the moon has less mass this means if you where to go to the moon your mass will stay the same but your weight will change
hope it helps
Which of the following describes Rutherford’s model of the atom?
A. Solid sphere like a marble but unique to the element it makes
B. Numerous positive charges floating around in a sea of negative charge (plum pudding)
C. Positive nucleus surrounded by a blob of negative charges
D. Positive nucleus surrounded by electrons in circular orbits
E. Positive nucleus surrounded by electron orbitals with complex 3-D shapes and assigned energies.
Answer: C. Positive nucleus surrounded by a blob of negative charges
What is the difference between the mass number of an isotope and its atomic number?the number of isotopesthe number of protonsthe number of neutronsthe number of electrons
Atomic mass refers to an element's average weight, whereas mass number refers to the number of nucleons.
The phrases "atomic mass" and "mass number," which are used in chemistry, have different meanings. The average weight of an element is one, while the number of nucleons in the atom's nucleus is another.Atomic weight is another name for atomic mass. The weighted average mass of an atom in an element is known as its atomic mass, and it depends on the relative abundance of its isotopes in nature.The total number of protons and neutrons in the nucleus of an atom is counted to determine the mass number.There are three naturally occurring isotopes of hydrogen, each of which has a unique mass number.1H has a proton and a mass number of 1, while 2H has a proton and a neutron. 1 proton and 2 neutrons make up 3H, which has a mass number of 3. 1H makes up 99.98% of all hydrogen. 1 It is coupled with 2H and 3H to produce a total hydrogen atomic mass of 1.00784 g/mol.The protium isotope of hydrogen, which has a single proton, is the only one in which the atomic number and mass number are the same.Learn more about Isotopes here:
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Is the correlation between time spent studying each day positive or negative?
Answer:
Positive.
Explanation:
The slope is positive and increasing, thus meaning there is a positive correlation between time spent studying each day and performance.
Cells taken from a frog and a human are placed in a salt solution. The frog cells swell and burst o
while the human cells shrink. Explain these results.
If the frog cells swell and burst while the human cells shrink means that the solution will be hypotonic for frog cells while for human cells the solution will be hypertonic.
Why do these changes happen?These changes will occur because in the frog cell there will be higher concentrations of ions than in the extracellular space, so water will enter the cell by osmosis to equalize the concentrations of the cells. While in the human cell there will be a lower concentration of ions than outside the cell, for this reason the water leaves it in order to equalize the concentrations both inside and outside the cell. Being then the hypotonic solution for the frog cell and hypertonic for the human cell.
Therefore, we can confirm that if the frog cells swell and burst while the human cells shrink means that the solution will be hypotonic for frog cells while for human cells the solution will be hypertonic.
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Calcium oxide is used to remove the pollutant so2 from smokestack gases. the overall reaction is:____.
Calcium oxide is used to remove the pollutant so2 from smokestack gases. the overall reaction is:
CaO(s)+SO2(g)+ 1/2 O2(g)CaSO4(s)
What is calcium oxide?
Calcium oxide (CaO), commonly referred to as quicklime or burnt lime, maybe a widely used chemical compound. it's a white, caustic, alkaline, crystalline solid at temperature.
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at a particular temperature, the solubility of co₂ in water is 0.13 m when the partial pressure is 1.5 atm. what partial pressure (in atm) of co₂ would give a solubility of 0.080 m?
The partial pressure of CO₂ which will give a solubility of 0.080 m is 0.93 atm, at a particular temperature.
Using Henry's Law,
Henry's law states that, solubility of a gas in a liquid is directly proportional to the partial pressure of gas and mole fraction of gas is proportional to partial pressure of the gas.
It is expressed as -
Sgas = Kh Pgas
where,
Sgas = Solubility of
Kh = Henry's law constant
Pgas = Partial pressure of gas
Putting the values in the above expression,
Sgas = Kh Pgas
0.13 M = Kh x 1.5 atm
Kh = 0.13 M
1.5 atm
Kh = 0.086
For partial pressure,
Sgas = Kh Pgas
0.080 M = 0.086 x Pgas
Pgas = 0.080 = 0.93 atm
0.086
Partial pressure of CO₂ is 0.93 atm
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HELP ME FLOCABULARY
help me please
Answer:
a
Explanation:
potential energy is something that could happen but haven't yet
question 3 a reaction equation, shown below, consumes 5.0 g of a and 6.0 g of b. how many total grams of c and d should be obtained? 1 a 3 b → 2 c 4 d
5.0 g of a and 6.0 g of b will obtain 11g of c and d, according to the law of conservation of mass.
What is law of conservation of mass?
The law of conservation of mass, also known as the principle of mass conservation, states that for any system closed to all transfers of matter and energy, the system's mass must remain constant over time because the mass of the system cannot change, meaning that neither more nor less can be added or taken away.
This law states that regardless of the physical or chemical change, the total mass of the products and the total mass of the reactants stay the same. Also referred to as the "law of indestructibility of matter," the law of conservation of mass.
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failure to mix a specimen containing an anticoagulant by inverting the sealed specimen container several times after collection of the specimen
Failure to mix a specimen containing an anticoagulant by inverting the sealed specimen container several times after collection of the specimen is due to the clots in specimen.
Clots in specimen or clotted specimen refers to an abruptly clotted blood specimen in which clotting occurs in that tube which contains anticoagulant. A specimen is clotted when the anticoagulant in the tube is not adequately mixed.
To mix and ensure adequate anticoagulation of the specimen, tube filled with the blood has to be inverted 8 - 10 times immediately, so that clots in specimen do not occur.
Specimen is supposed to be mixed immediately to ensure that anticoagulant in the tube has been fully dissolved with the specimen, which in return maintains the effective anticoagulant-to-specimen ratio and provides a specimen free from any clots.
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Coach is used to activate carboxylic acids. what type of compound is formed between coach and a carboxylic acid?
The type of compound is formed between coach and a carboxylic acid alcohol + carboxylic acid → ester + water.
How carboxylic acids are formed?
A acid is produced after the acidic hydrolysis of esters and carboxylates are produced after the basic hydrolysis of an ester.
What are the functional group of alcohol and carboxylic acid?
Alcohols contain the hydroxyl functional group and may be primary, secondary, or tertiary. Ethers are compounds with an oxygen atom bonded to 2 alkyl groups. Aldehydes and ketones contain the carbonyl functional group
Can a compound be a acid and an alcohol?
Esters are represented by the formula RCOOR', where R and R' are hydrocarbon groups. The ester, which is compound derived from a carboxylic acid and an alcohol in which the OH of the acid is replaced by an OR group, looks somewhat sort of a n ether and also somewhat like a carboxylic acid.
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