Answer:
See explanation
Explanation:
% optical purity = specific rotation of mixture/specific rotation of pure enantiomer * 100/1
specific rotation of mixture = 23°
specific rotation of pure enantiomer = 61°
Hence;
% optical purity = 23/61 * 100 = 38 %
More abundant enantiomer = 100% - 38 % = 62%
Hence the pure (S) carvone is (-) 62° is the more abundant enantiomer.
Enantiomeric excess = 62 - 50/50 * 100 = 24%
Hence
(R) - carvone = 38 %
(S) - carvone = 62%
Answer:
Explanation:
ee= -23/-61 × 100= 38%
S + R = 100%
S - R = 38%
Solve simultaneously;
S= 69% ( excess)
R= 100-69= 31%
Which specialized structures allow dolphins to breathe?
A. Watertight eggs
O B. Gills
C. Lungs
D. Milk-producing glands
Answer:
lungs
Explanation:
they don't have gills, and the milk producing glands and watertight eggs have nothing to do with it
Answer:
lungs
Explanation:
dolphins are mammals not fish
Plzzzzzzz helpppppppppp
Answer:
False
Explanation:
A phenotype is physical characteristics, like eye color, and genotype is the code (tt, Tt, TT, that sort of thing) for it. A genotype can be dominant or recessive, dominant is capita, recessive is lowercase.
Question 32. If scientist make an observation that does not agree with an accepted scientific theory, the scientists should
PLEASE HURRY
Answer:
I would say A.
Explanation:
explain how density can be used as a conversion factor to convert the volume of an object to the mass of the object, and vice versa
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
What is density?
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
And similarly we can calculate the volume which is equal to as follows:-
Volume = mass / density.
S.I unit of volume is meter cube and C.G.S unit is cubic centimeter.
So, we can say that mass, volume and density all are dependent to each other and if any two is known we can easily calculate the third one.
Therefore, Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3.
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The element belongs to the p-block. It exhibits some characteristics of metals and some of nonmetals. It is a solid at room temperature. It contains 3d electrons, but not 4d electrons. It is also known NOT to have chemical properties similar to those of nitrogen. The element must be
Answer:
Arsenic
Explanation:
From the introduction given in the question, the element we are considering must be a member of group 15 because of its similarity to nitrogen.
We were also told that it exhibits the characteristics of metals and some nonmetals hence the element is a metalloid.
Lastly we were told that it contains 3d but not 4d electrons. This has ruled out antimony. Our only element standing now is arsenic!
The electronic configuration of arsenic is; [Ar] 3d¹⁰ 4s² 4p³. Hence the correct answer is arsenic.
WHAT IS THE ABILITY OF A SUBSTANCE TO BE DISSOLVED
Answer:
Solubility
Explanation:
Which location is more likely to experience rain?
location a 67%
location b 23%
location c 45%
location d 88%
If a solution containing 117.63 g of silver chlorate is allowed to react completely with a solution containing 10.23 g of lithium bromide, how many grams of solid precipitate will be formed
Answer:
18.8 g
Explanation:
The equation of the reaction is;
AgClO3(aq) + LiBr(aq)------>LiClO3(aq) + AgBr(s)
Number of moles of AgClO3 = 117.63 g/191.32 g/mol = 0.6 moles
Number of moles of LiBr = 10.23 g/86.845 g/mol = 0.1 moles
Since the molar ratio is 1:1, LiBr is the limiting reactant
Molar mass of solid AgBr = 187.77 g/mol
Mass of precipitate formed = 0.1 moles * 187.77 g/mol
Mass of precipitate formed = 18.8 g
If in a solution reaction between 117.63 g of silver chlorate and 10.23 g of lithium bromide takes place then, 18.8 grams of solid precipitate will be formed.
What is limiting reagent?In any chemical reaction limiting reagent is that reagent whose moles are present in less quantity as compared to the other reagent, is responsible for the formation of product.
Given chemical reaction is:
AgClO₃(aq) + LiBr(aq) → LiClO₃(aq) + AgBr(s)
Moles (n) will ce calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of AgClO₃ = 117.63g / 191.32g/mol = 0.6 moles
Moles of LiBr = 10.23g / 86.845g/mol = 0.1 moles
In this reaction LiBr is the limiting reagent and formation of product depends on this.
From the stoichiometry of the reaction it is clear that:
0.1 mole of LiBr = produce 0.1 mole of AgBr
Mass of AgBr = (0.1mol)(187.77g/mol) = 18.8 g
Hence mass of AgBr is 18.8 g.
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Which evidence is an indication that a chemical reaction has occurred?
A) melting of a substance
B) formation of a gas
C) boiling of a substance
D) freezing of a substance
Formation of gas is an evidence that a chemical reaction has occurred.
What are the characteristics of chemical reaction?The characteristics of chemical reaction are as follows:
1) Color change- The change in color of reactants when it is converted to products indicate that the reaction has taken place.
2)Evolution of gas-In some reactions , a gas is evolved indicating occurrence of chemical reaction.
3)Formation of precipitate- In some chemical reactions, an insoluble solid called as precipitate is obtained which is an indication that a chemical reaction has taken place.
4)Change in energy- In some cases of chemical reactions, there is a change in energy which is observed indicating occurrence of chemical reaction.
As the formation of gas is the characteristic of chemical reaction it serves as an indication for occurrence of chemical reaction.
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Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to be more acidic in aqueous solution than , e.g. have a larger .
The question is incomplete, the complete question is;
Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to be more acidic in aqueous solution than H2S , e.g. have a larger Ka.
Answer:
H2Se
Explanation:
The acidity and extent of acid dissociation (shown by Ka value) depends on the nature of the bond between hydrogen and the group 6A element.
If we compare the H-S bond and the H-Se bond, we will discover that the H-Se bond is longer, weaker and breaks more easily than the H-S bond. As a result of this, H2Se is more acidic than H2S.
There are three isotopes of X element (X):
X-17 isotope: atomic mass17.2 amu, abundance:78.99%
X-18isotope: atomic mass 18.1 amu, abundance 10.00%
X-19isotope: atomic mass:19.1 amu, abundance: 11.01%
Calculate the average atomic mass of X.
Explanation:
hope it will help friends
The molar mass-of H2O is 18.02 gram /mol. How many moles are present in 3.33 x 1024 molecules of
H2O?
Select one:
a. 9.97 moles H20
b. 99.7 moles H2O
c. 2.00 x 1048 moles H20
d. 5.53 moles H20
Answer
5.53moles
Explanation:
Given parameters
Number of molecules = 3.33 x 10²⁴
Unknown
Number of moles = ?
Solution
A mole of a substance contains the Avogadro's number of particles.
1 mole of a substance = 6.02 x 10²³
So, 3.33 x 10²⁴ molecules will contain;
3.33 x 10²⁴ / 6.02 x 10²³
= 5.53moles
What mass of NaOH is needed to make 500mL of 4M solution
Answer:
80.0 grams NaOH
Explanation:
500 mL = 0.500 L
M = moles / liters
4 M = x moles / 0.500 L
Multiply both sides by 0.500 L
2 moles = x
Convert moles to grams
2 moles NaOH x (39.998 grams NaOH / 1 mole) = 80.0 grams NaOH
In the nitrite ion (NO2-), __________. A) both bonds are single bonds B) both bonds are double bonds C) one bond is a double bond and the other is a single bond D) both bonds are the same E) there are 20 valence electrons
Answer:
B) Both bonds are double bonds
Explanation:
For nitrite ion, oxygen reacts with nitrogen oxide which is joined by a double bond to form nitrite ion.
Now, nitrite ion cannot have an expanded octet and thus both bonds will be the same with each bond being stronger and shorter than a single bond but they will be longer and weaker than a double bond.
PLZ HELP WILL GIVE 40 POINTS PLEASE
Answer:
A?
Explanation:
Denmark is characterized as temperature as a region . the winters typicky experience frequent snowfall and low temperatures. in contrast, the summers are typically mild. is the sentence talking about climate, whether, topography or atmosphere
During a lunar eclipse, what occurs? *
A. The Sun's shadow falls on the Moon.
B. The Moon's shadow falls on the Earth.
C. The Earth's shadow falls on the Moon.
D. The Moon's shadow falls on the Sun
Half of the Earth is dark. What is the dark half of Earth experiencing? *
A. A lunar eclipse
B. A solar eclipse
C. A power outage
D. Nighttime
A lunar eclipse in which the Moon lies completely in the Earth’s umbra is called a total lunar eclipse. In a penumbral lunar eclipse, the Moon lies partially in the penumbra. *
A. true
B. False
Each lunar cycle has one full moon, in which the relative positions of Earth, the sun, and the moon form in a straight line. Which list represents the position of Earth, the sun, and the moon during a full moon? *
A. Earth, sun, moon
B. sun, moon, Earth
C. moon, sun, Earth
D. sun, Earth, moon
Answer:
Lunar eclipse answer is
b
Ibuprofen (aka ADVIL) is a weak acid with a pKa of 4.9. It is absorbed through the stomach and the small intestine as a function of polarity - charged and very polar molecules are absorbed slowly; neutral hydrophobic molecules absorb quickly. If the stomach pH is about 1.5 and the small intestine pH is about 6, where (and why) will more ibuprofen be absorbed into the bloodstream
Answer:
Explanation:
There will be absorption of more ibuprofen in the stomach due to the fact that it will be uncharged because the pH is lower than the pKa.
The molecular formula for Ibuprofen is: C₁₃H₁₈O₂
The IUPAC name is:
(RS)-2-(4-(2-methylpropyl)phenyl)propanoic acid
From the attached image, we will see the structural formula of Ibuprofen.
What is the frequency of light whose wavelength is 6.33 x 10-7m?
Answer:
the frequency of light is
[tex]4.74 \times {10}^{14} [/tex]
Explanation:
from v = λf
speed of light in air, v = 3.0*10^8ms^-1
If an instant pot has an internal pressure of 191.0 kPa, temperature of 750.0 K and a volume of 6.5 L, how many moles of gas would be contained inside the instant pot?
Answer:
0.200 mol.
Explanation:
Hello!
In this case, since this case is considered an ideal one (no intermolecular interactions), we can use the following equation:
[tex]PV=nRT[/tex]
Thus, since we know the pressure, temperature and volume, we are able to compute the moles shown below:
[tex]n=\frac{PV}{RT} =\frac{191kPa*\frac{1000Pa}{1kPa} *6.5L*\frac{1m^3}{1000L} }{8.314\frac{Pa*m^3}{mol*K}*750.0K}\\\\n=0.200mol[/tex]
Best regards!
PLZ HELP 40 POINTS PLEASEEEEEE
Answer:
should be A
Explanation:
A4.5 g metal sample decreases in temperature from 48°C to 25°C when 68.5
of heat is removed from it. Calculate the specific heat capacity of the metal.
Answer:
[tex]C=0.662\frac{J}{g\°C}[/tex]
Explanation:
Hello!
In this case, since the heat removal when cooling down a body is computed via:
[tex]Q=mC\Delta T[/tex]
Given the removed heat, mass and temperature change, we solve for the heat capacity of the metal as shown below:
[tex]C=\frac{Q}{m\Delta T}[/tex]
Thus, by plugging in we obtain:
[tex]C=\frac{-68.5J}{4.5g*(25-48)\°C} \\\\C=0.662\frac{J}{g\°C}[/tex]
Best regards!
Which of these can be found in a plant cell but not in an animal cell?
A.) chromosome
B.)nucleus
C.)chloroplast
D.)cell membrane
i would really like it if u could help me out with this. please and thank u :)
Answer:
C.)chloroplastExplanation:
The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.
Breathing air that contains 4.0% by volume CO2 over time causes rapid breathing, throbbing headache, and nausea, among other symptoms. what is the concentration of co2 in such air in terms of mol percentage
Answer:
1 mole of any ideal gas occupies the same volume as one mole of any other ideal gas under the same conditions of temperature and pressure.So 1 L CO2 has same number of moles as 1 L O2 and 1 L N2 etc.This means that, assuming all the gases in air are ideal gases, if CO2 is 4.0 % by volume then it is also 4.0 % by moles, because a volume of each gas has the same number of moles.
Explanation:
Pure water and pure salt are poor conductors of electricity. When salt is dissolved in water, the resulting solution conducts electricity well. Which statement explains why this occurs with these substances?
The process of dissolving makes the electrons in their atoms free to move
The process of dissolving makes the atoms in them free to move
The process of dissolving makes the electrons in their atoms more closely bound
The process of dissolving makes the atoms in them more closely bound to each other
Answer:the process of dissovlving makes the ecectrons in their atoms more closely bound
Explanation:
thats what my lesson said
The solution of water and salt are good conductor of electricity because the process of dissolving makes the electrons in their atoms free to move.
The correct option is (A).
What makes a solution of water and salt a good conductor?Pure water and salt are bad conductor of electricity.
But the solution of water and salt is a good conductor because when a salt's dissociated it's ions are free to move about in solution when it dissolves, allowing a charge to flow freely.
Because it includes ions, the resulting solution will conduct electricity.
Thus, option (A) the process of dissolving makes the electrons in their atoms free to move, that's why the solution of water and salt are good conductor of electricity.
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Which of the following converts mechanical energy to electrical energy?
O A. An electric generator
O B. A loudspeaker
O C. An electromagnet
O D. An electric motor
Answer:
an electrical generator
At what temperature can 10g of Cez(SO4)3 be dissolved in 100g of water?
A.10
B.20
C.60
D.40
A sample of carbon monoxide gas occupies 3.20 L at
125 °C. At what temperature will the gas occupy a
volume of 1.54 L if the pressure remains constant?
The final temperature : 191.54 K = -81.46 °C
Further explanationGiven
V₁=3.2 L
T₁ = 125 +273 = 398 K
V₂=1.54 L
Required
The final temperature(T₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
T₂=(V₂T₁)/V₁
T₂=(1.54 x 398)/3.2
T₂=191.54 K = -81.46 °C
***Question in photo***
Is the entropy positive or negative in this question?
Answer:
Enthalpy change is negative
Entropy change is Positive
Explanation:
A drawback of the space shuttle was
Answer:
The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
Explanation:
Answer:
The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
