Answer:
Looking for certain physical properties.
Explanation:
These properties include color, size, mass, luster, etc.
Weighing the item is a common way to find one physical property, mass.
What is the value of R in the ideal gas law?
O A. -0.0821 L'atm/mol K
OB. 0.0821 L'atm/mol:K
O c. 273 L'atm/mol K
O D. -273 L'atm/mol K
What are the names of the 3 types of
galaxies?
A. spiral, elliptical, electromagnetic
B. spiral, irregular, electromagnetic
C. elliptical, obtuse, irregular
D. spiral, elliptical, irregular
a compressed gas cylinder contains argon gas. the pressure inside the cylinder is psi (pounds per square inch) at a temperature of . how much gas remains in the cylinder if the pressure is decreased to psi at a temperature of ?
we can use the ideal gas law: PV = nRT where P is the pressure of the gas in pounds per square inch (psi), V is the volume of the gas in cubic inches (in^3), n is the number of moles of gas,
R is the gas constant (which is 10.73 psi·in^3/mol·K for argon), and T is the temperature of the gas in Kelvin (K).
Since we are only interested in the change in the amount of gas, we can assume that the volume of the cylinder remains constant. Therefore, we can write:
n1 = (P1 V) / (R T1)
where n1 is the initial number of moles of gas, P1 is the initial pressure of the gas, V is the volume of the gas (which we assume remains constant), R is the gas constant for argon, and T1 is the initial temperature of the gas.
To find the final number of moles of gas, we can use the same equation with the final pressure and temperature:
n2 = (P2 V) / (R T2)
where n2 is the final number of moles of gas, P2 is the final pressure of the gas, and T2 is the final temperature of the gas.
To find the change in the amount of gas, we can subtract n2 from n1:
Δn = n2 - n1 = (P2 V) / (R T2) - (P1 V) / (R T1)
Substituting the given values, we get:
Δn = [(14 psi) × V] / [(10.73 psi·in^3/mol·K) × (273 K)] - [(10 psi) × V] / [(10.73 psi·in^3/mol·K) × (300 K)]
Simplifying this expression, we get:
Δn = (4 psi × V) / (3483.9 psi·in^3/mol)
where we have converted the temperatures to Kelvin.
To find the mass of argon that remains in the cylinder, we can use the molar mass of argon, which is 39.95 g/mol. The mass of argon in the cylinder is:
m = n1 × 39.95 g/mol
Substituting n1 from the first equation, we get:
m = [(P1 V) / (R T1)] × 39.95 g/mol
To find the final mass of argon, we can use the same equation with the final number of moles:
m' = [(P2 V) / (R T2)] × 39.95 g/mol
To find the change in mass, we can subtract m' from m:
Δm = m' - m = [(P2 V) / (R T2)] × 39.95 g/mol - [(P1 V) / (R T1)] × 39.95 g/mol
Substituting the given values and simplifying, we get:
Δm = (4 psi × V) / 87.67 g
Therefore, the change in mass of argon in the cylinder is:
Δm = (4 psi × V) / 87.67 g
Note that the result depends on the volume of the cylinder, which is not given in the problem.
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Put the following chromatography solvent in order of polarity as a chromatography solvent: acetone, npropanol, water, hexane, diethyl ether, methanol. 2) You will be doing chromatography with a mixture of n-propanol and water. Would it make sense to add 5) Two cars full of people took a day trip. Car A had a lot of little kids and stopped at lots of rest stops and gas stations to give them a break. Car B had just adults in it, and only stopped once. Of course Car B got to the destination first. Explain how this in an analogy for the chromatography you are doing in this experiment help please
LEAST TO MOST POLAR- hexane,diethyl ether,acetone,n-propanol,water ,methanol
Considering the problem we can say that the kids are compared to be more polar or smaller molecular weight compounds. The more polar compounds interact with silica more just as the kids bus stopped at every point and reached the destination late. Whereas, the adult bus is compared to be less polar compounds or high molecular weight which interacts less and reaches the destination faster.
Thus more polar compounds reaches the destination late whereas less polar compound reaches first.
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Answer F and G for this AP Chem FRQ
What is the order of the solvents from most to least polar?
The position in extremity from most to least is water, ethanol, ethyl acetic acid derivation, CH3)2CO, 2-butanone, diethyl ether, hexane, and benzene.
From these solvents, ethanol will be totally miscible in water because of its more modest carbon fasten and it's capacity to frame hydrogen bonds.
Water is a polar dissolvable; other polar solvents incorporate CH3)2CO, acetonitrile, dimethylformamide (DMF), dimethylsulfoxide (DMSO), isopropanol, and methanol.
One way you could really work out a dissolvable's extremity is by utilizing its dielectric consistency, which is utilized to quantify how well the dissolvable can part of the way drop the field strength of the electric field of a molecule added to it. The higher the worth of a dissolvable's dielectric consistent, the more polar it will be.
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When the reaction stops. the undissovle penny is removed. what is the mass of the unidssolved penny?
When the reaction stops and the undissolved penny is removed, the mass of the undissolved penny will depend on the initial mass of the penny before the reaction occurred. To determine the exact mass of the undissolved penny, it would be necessary to weigh it using a scale.
Copper oxide dissolves in water, but it usually takes a long time. The combination of vinegar (a weak solution of acetic acid), and table salt (sodium chloride) helps to dissolve the copper oxide, and also forms the blue copper(II) ion, which is soluble in water. The penny becomes shiny again!
Current pennies are made from a piece of zinc coated with a thin layer of copper. The modern penny is not 100% pure copper as it was prior to the 1960's. You will dissolve the entire penny in the concentrated nitric acid.
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Heated gaseous atoms of elements emit light in unique colored patterns as electrons drop from
excited energy states to ground energy states. Heated hydrogen atoms have only four colored
lines, red, green, blue and violet. What prediction did Niels Bohr make about electrons based on
this information?
Answer:
b
Explanation:
Here are two different reactions:
- CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) + 213 kcal
- N2(g) + O2(g) + 45 kcal → 2NO(g)
Which of the above reactions might have taken place in the beaker? Support your answer with evidence.
The reaction that does not occur in a beaker is;
- CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) + 213 kcal
Why does combustion reaction not occur in a beaker?In a beaker, it is unlikely that all of these conditions will be met for a combustion reaction to occur. For example, there may not be enough fuel present in the beaker to sustain a combustion reaction, or there may not be enough oxygen to support the reaction.
Additionally, an ignition source such as a spark or flame is usually necessary to initiate the reaction, which is unlikely to be present in a beaker.
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What is the part of the male reproductive organ that stores newly-formed sperm cell?
A. Testes
B. Epididymis
C. Vas Deferens
D. Urethra
Please explain(clearly) your answer Thank you
Answer:
B. Epididymis
Explanation:
Sperm are stored in the epididymis until fully developed. The epididymis is located on the back part of the testis, the male’s reproductive organ.
Choose the pair of substances that are most likely to form a homogeneous solution.
A. F2 and C2H5OH
B. H2O and CH3OH
C. LiCl and C10H20
D. CH4 and C2H5OH
A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).
The pair of substances that are most likely to form a homogeneous solution is B. H2O and CH3OH. A homogeneous mixture is one in which the components are evenly distributed throughout the mixture. These types of solutions have uniform properties and the same composition throughout.A heterogeneous mixture is one in which the components are not evenly distributed. This means that the mixture has distinct regions or phases that are visibly different from one another. The following are the most likely pairs of substances to form a homogeneous solution:A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).
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When broken down by catalase what does hydrogen peroxide become.
Answer:
It is broken down into water and oxygen
Explanation:
2H2O2 -----> 2H2O +O2
Magnesium will...
• Gain 2 electrons and become Mg2-
• Lose 2 electrons and become Mg2-
• Gain 2 electrons and become Mg2+
• Lose 2 electrons and become Mg2+
Answer:
D
Explanation:
magnesium always lose 2 electrons
When cleaning a buret, begin by coating the inside with _____ Empty most of it out, then drain the rest by ______ Rinse with ______, then hang upside-down on a buret rack
When cleaning a buret, start by rubbing a detergent solution within it. the majority of it out, then drain the remainder by turning on the stopcock Following a deionized water rinse, hang the item upside-down on a buret rack.
Briefly rinse glassware with an organic solvent to get rid of organic remains (acetone or ethanol). Next, the used rinse will be thrown out with the organic garbage. Scrub the interior of curved glassware with warm tap water and a brush dipped in soapy water. A buret is clean if there are no water stains on the cleaned area inside the buret's barrel. The solution that will be given from the buret should be washed through the buret two or three times. Close the stopcock and clamp the buret to a ring stand vertically. Because vinegar is denser than oil, it will sink to the bottom while the oil floats to the top. The two distinct layers in oil-and-vinegar salad dressing are due to this.
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the complete combustion of 1.5 moles of methane (ch4) would require how much o2?
The complete combustion of 1.5 moles of methane (CH4) would require 6 moles of oxygen (O2).
This is because methane is a hydrocarbon and it follows the general equation of combustion for hydrocarbons: CxHy + (x+y/4)O2 → xCO2 + yH2O. In this equation, x and y represent the number of carbon and hydrogen atoms, respectively, in the hydrocarbon.
Therefore, for methane, where x = 1 and y = 4, the equation simplifies to CH4 + (1+4/4)O2 → CO2 + 2H2O. Thus, for 1.5 moles of methane, the equation becomes 1.5CH4 + (1+4/4)1.5O2 → 1.5CO2 + 3H2O.
Since the equation must be balanced, the total amount of oxygen required is 1.5 moles of O2, which is equal to 6 moles.
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he long run equilibrium condition for perfect competition is:
a. P=AVC=MR=MC.
b. Q=AVC=MR=MC.
c. Q=ATC=MR=MC.
d. P=ATC=MR=MC.
Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).
Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.
In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.
Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.
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Which statement is true of a reversible reaction at equilibrium?
А.
The concentration of reactants is less than the concentration of products.
B.
The concentration of reactants and the concentration of products are equal.
с.
The concentration of reactants is greater than the concentration of products.
D.
The concentration of reactants and the concentration of products are constant.
Ε.
The concentration of reactants is decreasing and the concentration of products is increasing,
Answer:
D.
The concentration of reactants and the concentration of products are constant.
Explanation:
pls mark as brainliest
One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements? Explain your answer
Answer: Both the given species are isotopes of the same element.
Explanation:
An isotope is defined as the chemical species that have the same atomic number but a different mass number.
The atom consists of 3 subatomic particles:
Protons: They are positively charged particles present in the nucleus of an atom. Electrons: They are negatively charged particles present in the orbits around the nucleus of an atom. Neutrons: They are neutral particles present in the nucleus of an atom.An atomic number is defined as the number of protons or number of electrons present in a neutral atom. It remains specific for a particular element.
Mass number is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.
Given values:
For isotope 1:
Number of protons = 11 = atomic number
Number of neutrons = 13
Mass number = 11 + 13 = 24
For isotope 2:
Number of protons = 11 = atomic number
Number of neutrons = 12
Mass number = 11 + 12 = 23
As the atomic number of both the isotopes is the same. Thus, they belong to the same elements.
What is the chemical equation of a covalent bond
Answer:
In my knowledge of chemistry, I believe there isn't chemical equation for covalent bond. There is only covalent formula
Explanation:
half-reaction for the oxidation of gaseous nitrogen dioxide no2 to nitrate ion no−3 in acidic aqueous solution
The half-reaction for the oxidation of gaseous nitrogen dioxide to nitrate ion in acidic aqueous solution is: 2NO2 + 4H+ + 4e- → 2NO3- + 2H2O
First, the NO2 molecules lose electrons to form nitrate ions. The balanced equation for this step is:
2NO2 + 4H+ + 4e- → 2NO3- + 2H2O
In this equation, the NO2 molecules are oxidized to NO3- ions by losing 4 electrons. The hydrogen ions (H+) from the acidic solution are also involved in the reaction.
Next, to balance the charges on both sides of the equation, 4 hydrogen ions are added to the reactant side.
Finally, 2 water molecules are formed as a product on the right-hand side of the equation.
Overall, the half-reaction for the oxidation of gaseous nitrogen dioxide to nitrate ion in acidic aqueous solution is:
2NO2 + 4H+ + 4e- → 2NO3- + 2H2O
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In some chemical reactions, such as photosynthesis, several different compounds take part in the reaction. How do you think that atoms present at the end of this kind of reaction compare to the atoms present at the beginning of the reaction? Explain.
Answer:
The atoms present at the beginning of the reaction is equal to the atoms present at the end of the reaction. This is because matter can neither be created nor be destroyed in an ordinary chemical reaction.
Explanation:
During photosynthesis, 6 molecules of water react with 6 molecules of carbon dioxide to form 1 molecule of glucose and 6 molecules of oxygen. The equation for the photosynthesis reaction is
6CO2 + 6H2O --> C6H12O6 + 6O2
At the beginning of the reaction, there is 6 carbon atoms, 18 oxygen atoms and 12 hydrogen atoms while at the end of the reaction, there is 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms. This is because according to the law of conservation of mass and matter, it can neither be created nor be destroyed in an ordinary chemical reaction. The number of atoms present at the beginning of the reaction must be equal to the number of atoms present at the end of the reaction.
Balance the following redox reaction under acidic aqueous conditions using the smallest whole-number coefficients possible. On which side does H (aq) appear, and what is its coefficient? 79. MnO4(aq)+(aą) 1(aq) +Mn2 (aq) a. left, 16 b. right, 16 c. left, 8 d. right, 8 e. right, 4
H+ appear on left hand side and the coefficient is 16 in the balanced redox reaction under acidic aqueous conditions.
What is redox reaction?
Redox reactions, also referred to as oxidation-reduction processes, are reactions in which electrons are transferred from one species to another. An oxidized species is one that has lost electrons, whereas a reduced species has gained electrons.
The balanced redox reaction under acidic aqueous conditions using the smallest whole-number coefficients is written as
\(2MnO+16H^{+} +10I^{-}\) → \(2Mn2^{+} + 8H_{2} O + 5I^{2}\)
Therefore, the H+ is present on left side with a coefficient of 16 in the balanced redox reaction under acidic aqueous conditions.
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Succinic acid dissociates as follows: H₂C4H4O4+H₂O HC4H4O4 + H3O+ Ka1 = 6.2 × 10-5 HC4H4O4+H₂0 C4H4O42- + H3O+ Ka2 = 2.3 x 10-6 Calculate Kb1 and Kb2 for the following reactions (3 points): C4H4042 + H2O HC4H4O4 + OH- Kb1 = ? HC4H4O4+H₂O H2C4H4O4 + OH- Kb2 = ?
Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.
For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.
The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:
Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6
The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:
Ka1 × Kb1 = Kw
where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.
Kb1 can be calculated as follows:
Kw = Ka1 × Kb1
Kb1 = Kw / Ka1
Kw = 1.0 × 10^-14
Ka1 = 6.2 × 10^-5
Kb1 = Kw / Ka1
Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5
Kb1 = 1.61 × 10^-10
Kb2 can be calculated using the same method:
Kw = Ka2 × Kb2
Kb2 = Kw / Ka2
Kw = 1.0 × 10^-14
Ka2 = 2.3 × 10^-6
Kb2 = Kw / Ka2
Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6
Kb2 = 4.35 × 10^-9
Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.
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How is melting similar to freezing? How is it different?
Melting and freezing refer to the changes in state which occur when the solid and liquid states interchange. Melting occurs when a solid is heated and turns to a liquid and freezing occurs when a liquid is cooled and turns to a solid.
Answer:
Melting and freezing both require energy, however melting involves the speeding up of molecules, and freezing involves slowing them down
Explanation:
he hybridization of one s and one p orbital will result in the formation of _____ sp hybrid orbitals. This will leave _____ unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves _____ unhybridized p orbital(s). Multiple choice question. two; two; no two; two; one three; two; one one; two; one
The complete statement is "The hybridization of one s and one p orbital will result in the formation of two sp hybrid orbitals. This will leave two unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves one unhybridized p orbital(s). " Option B. This is further explained below.
What is hybridization?Generally, hybridization is simply defined as hybridization describes the offspring produced when one species of plant or animal mates with another.
In conclusion, After a cluster of sp2 hybrid orbitals forms, there is still one p orbital that is not hybridized (s).
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The density of red wine is 1.01g/cm3 and the density of olive oil is 0.92g/cm3.A salad dressing that consisted of these two ingredients was left sitting too long.The ingredients separated in the bottle ,which ingredient is which layer? Explain.
Answer:
The olive oil will be on top of the vinegar, this is because the density is more
Explanation:
since vinegar has a higher density than oil it will sink to the bottom of the bottle. subsequently oil will raise up. thus oil higher layer vinegar lower layer! :) . concentration in g/L....what u are given is 5.4g and 50ml
so first change the ml into L
50ml = 0.050L
now... 5.4g/0.050L = 108g/L
resolve in significant figures is 1.1 x 10^2 g/L
b. molarity = mol/L
L = 0.050 (calculated from above)
now we only have to convert the grams (5.4g) into mols
there are three elements in sucrose ( C = carbon, H = hydrogen
and O = oxygen)
look at the periodic table and find their molar mass (atomic weight)
Carbon = 12.0g/mol
Hydrogen = 1.00g/mol
Oxygen = 16.0g/mol
Sucrose contains 12 carbons, 22 hydrogens, and 11 oxygens
So the total molar mass of sucrose =
Carbon - 12 x 12.0 = 144
Hydrogen - 22 x 1.00 = 22
Oxygen - 11 x 16.0 = 176
Total = 144 + 22 + 176 = 342g/mol
Now u have 5.4grams of sucrose to change to mols u:
5.4 grams x 1 mol/ 342grams
in other words 5.4 grams / 342 grams leaving u with mols
= 0.0158 mols
now your concentration in molarity will be:
0.0158 mols / 0.050L = 0.32M (two significant figures)
and the unit is M which stands for mol/L
c. you are given 7M (aka mol/L)
you are given 100ml which equals 0.1L
7 mol/L x 0.1L = 0.7mol
all u have left to do is change the 0.7 mol back into grams
to do that we do the opposite of what we did in part b
in part b u took grams and changed it into mols
here we are taking mols and changing it back into grams
from part b we calculated the total molar mass = 342g/mol
so:
0.7 mol x 342 g/mol = 239.4grams
resolve into significant figures = 2 x 10^2 grams
Observable matter makes up about what percentage of the universe?
05%
O 10%
O 50%
0 95%
Tutori
Previous Activity
avtorot void
K!
The universe as we know it is home to several galaxies, planets and stars. Hydrogen and helium were the most abundant elements present in the early universe. Heavier elements like carbon, oxygen, phosphorus and even metals were later formed through various fusion reactions in stars.
Nevertheless, matter makes up only 5% of the universe. Nearly 95% is referred to as 'dark matter' which is a subject of research in many scientific communities.
Answer: A) 5%
Write short note on the mole concept.
Relate the mole concept with stoichiometric calculations.
Answer:
A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Explanation:
A balanced chemical reaction gives equivalences in moles that allow stoichiometry calculations to be performed. Mole quantities of one substance can be related to mass quantities using a balanced chemical equation. Mass quantities of one substance can be related to mass quantities using a balanced chemical equation.
if a 1.00 ml sample of the reaction mixture for the equilibrium constant experiment required 32.40 ml of 0.258 m naoh to titrate it, what is the monoprotic acetic acid concentration in the mixture? select one: 0.399 m 5.82 m 8.36 m 7.96 m 12.6 m
The mixture contains a concentration of monoprotic acetic acid of
(8.36 M). (0.0083592 mol/1000 mL = 8.36 M) = 0.258 M x 32.40 mL/1000 L.
What is an example of monoprotic acid?Monoprotic acids include benzoic acid (C6H5CO2H), acetic acid (CH3CO2H or HOAc), nitric acid (HNO3), and hydrochloric acid (HCl).
What strength of acid is monoprotic acid?H2SO4 and H3PO4 are examples of polyprotic acids that contain two or three hydrogen ions. Although it is alluring to believe that polyprotic acids are more powerful than monoprotic acids since they include several hydrogen ions, this is not the case.
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14. Which of the following alkanols on oxidation is most likely to yield the
compound below?
CHICHICOOON
.CO
(A) Butanol (B) Propan-2-ol(2-methylbutan-1-ol (D) 2-methylpropan-1-
ol (E) 2-methylpropan-2-ol.
Answer:
A
Explanation:
I think that is the ans but am not sure
Answer:
2-methylpropan-1-ol.
Explanation:
\({ \tt{CH _{3}CH(CH _{3})CH _{2}OH}}\)