Answers
Answer:
(S)-2-pentanenitrile
Explanation:
The reaction between (R)-2-bromopentane and sodium cyanide in DMSO occurs by SN2 mechanism.
Recall that CN^- is a strong nucleophile. In the presence of aprotic solvents, SN2 mechanism predominates with a strong nucleophile.
SN2 mechanism leads to inversion of configuration. Therefore, the major product of the reaction is (S)-2-pentanenitrile
There are different types of chemical reaction. (S)-2-cyanopentane is known to be the major product in the reaction of (R)-2-bromopentane with sodium cyanide in DMSO solvent.
The (2R)-2-bromopentane is known to reacts with sodium cyanide in DMSO solvent leading to the production of (2S)-2-methylpentanenitrile as a key product.
This formation takes place because DMSO is a polar aprotic solvent and often incline to the product formation via SN2mechanism where inversion of configuration takes place.
Nucleophilic Substitution Reaction is simply known to be a type of chemical reaction where the nucleophile attacks the reactant from the rear side.
Note that the product gotten from this kind of reaction will habe to be of inverted stereochemistry.
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Related Questions
Write this number in
scientific notation.
19, 800, 000
Answers
Answer:
All the numbers in scientific notation written in the form a × 10b, where b is an integer and the coefficient a is a non-zero real number between 1 and 10 in absolute value.
To convert 19800 into scientific notation also known as standard form, follow these steps:
Move the decimal 4 times to left in the number so that the resulting number, m = 1.98, is greater than or equal to 1 but less than 10
Since we moved the decimal to the left the exponent n is positive
n = 4
Write in the scientific notation form, m × 10n
= 1.98 × 104
PLEASE HELP
Heat of Fusion (Hf) of Ice
Obj: Determine Hf of Ice
Materials: ice at 0oC, insulated cups, balance, thermometer
Methods
1. Fill the insulated cup with exactly 100.0 mL H2O at approximately 350C to 40oC. Record the mass of the cup and water and the temperature to 0.1o C just before adding the ice cube.
2. Add a "dry" ice cube at 0oC to the cup; hold it submerged with another insulated cup; stir gently.
3. Avoid spilling water. Record the lowest temperature observed and the final mass of the system.
4. Calculate the mass of the ice cube.
Analysis
1. Calculate the heat of fusion (Hf) of ice using the equation: (c of water is 4180 J/Kg o C)
mw c ΔT = mi Hf + mi c ΔT where mi is the mass of the ice cube
(water) (ice) (ice water)
2. Determine the % error. What are some sources of error?
3. Define Hf.
4. Why was it desirable to use an ice cube at 00C rather than at a temperature below zero Celsius?
5. Why did we start with water at approximately 350 C?
6. What laboratory conditions would be ideal for performing this lab?
7. If an iceberg at 00 C has a mass of 200,000,000 kg, how much heat would be required to melt the entire iceberg and raise the melt water to 8.00 C?
Answers
To answer the seventh question, we need the specific value of the heat of fusion (Hf) of ice. This information is missing from the given text, so we cannot provide the final answer.
Analysis:To calculate the heat of fusion (Hf) of ice, we can use the equation:mw c ΔT = mi Hf + mi c ΔTwhere mw is the mass of water, c is the specific heat capacity of water (4180 J/kg oC), ΔT is the temperature change, and mi is the mass of the ice cube.To determine the percent error, compare the calculated Hf value obtained in step 1 with the accepted value. Possible sources of error could include inaccuracies in measuring the masses and temperatures, heat loss to the surroundings, and incomplete mixing of the ice and water.Hf, or the heat of fusion, is the amount of heat energy required to change a substance from a solid to a liquid state at its melting point without a change in temperature.It is desirable to use an ice cube at 0oC rather than below zero Celsius because the heat of fusion only applies to the transition from solid to liquid at the melting point (0oC for water). If the ice cube were below 0oC, the heat absorbed would not solely be attributed to the heat of fusion.Starting with water at approximately 35oC allows for a measurable temperature change when the ice cube is added. This temperature difference helps in calculating the heat transfer and determining the heat of fusion.Ideal laboratory conditions for performing this lab would include minimizing heat loss to the surroundings, ensuring accurate measurements of mass and temperature, maintaining proper insulation of the cups, and ensuring complete mixing of the ice and water.To calculate the amount of heat required to melt the entire iceberg and raise the melt water to 8.00oC, we need to multiply the mass of the iceberg (200,000,000 kg) by the heat of fusion (Hf) and add the heat required to raise the temperature of the melt water (specific heat capacity of water × mass × temperature change).For more questions on heat of fusion
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At 20C what is the molar mass of a gas with a denisty of 1.02g/L at 2.13atm
Answers
The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.The molar mass of an element or compound is the mass of one mole of that substance. A mole is the SI unit for the amount of a substance.
It's defined as the amount of a substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.Molar mass (M) = mass (m) ÷ amount of substance (n)So, M = m/n
Where m is the mass in grams and n is the number of moles. The unit of molar mass is grams per mole (g/mol).
The ideal gas law is used to calculate the molar mass of a gas. The ideal gas law is:P V = n R T,Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
Convert the density to grams per liter: 1.02 g/L.
The density is mass/volume, thus 1.02 g/L means that 1 liter of the gas weighs 1.02 g.
This means that 1 mole of gas will occupy 22.4 L (at standard temperature and pressure, STP).Calculate the number of moles of gas using PV = nRT.P = 2.13 atmV = 22.4 L (at STP)R = 0.0821 L·atm/K·molT = 273.15 K + 20 K = 293.15 K
Thus, n = PV/RT = (2.13 atm × 22.4 L)/(0.0821 L·atm/K·mol × 293.15 K) = 0.973 mol
Calculate the molar mass (M) using M = m/n.m = density × volume = 1.02 g/L × 22.4 L = 22.848 gM = m/n = 22.848 g/0.973 mol = 23.5 g/mol Convert to units of grams per mole: 23.5 g/mol
The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.
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An unknown solution has a pH of 6.8. Which of these chemicals is likely to increase the pH the most when added to the solution? (5 points)
a
NaOH
b
HCl
c
NH3
d
HNO3
Answers
Answer:
NaOH
Explanation:
An unknown solution has a pH of 6.8. The chemical that will increase the pH is NaOH. The correct option is a.
What are acid and bases?
Acids have lower pH, and they are sour and bases have high pH, and they are bitter in taste.
HCl, NH3, HNO3 are all acids and acid decrease the pH. Only NaOH is a base, and it will increase the pH.
Thus, the correct option is a. NaOH.
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NH3 is a weak alkali that does not dissociate fully into its solution. Which of the following is true about NH3?
A. It has a very low pH.
B. It's dissociation is a reversible reaction.
C. It has a high H+ concentration.
D. It will release all of its OH- ions.
Answers
Answer:
Answer:
B. It's dissociation is a reversible reaction
Explanation:
NH3 is a weak alkali that does not dissociate fully into its solution. Only parts of the ammonia takes part in the dissociation process.
NH3 + H20 —> NH4+ + OH-
This dissociation is reversible which means the reactants can be formed from the product gotten from the dissociation
It has a high pH due to its basic nature. It also has a Low concentration of H+ ions and not all the OH- ions are released.
chemical reactions occur in predictable ways
Answers
Answer:
Yes that is why you can even see how some chemicals might react but that is if you are not considering temperature, pressure, or if catalyst are involved.
What is the volume of the graduated cylinder below, write your answer to the proper number of significant digits and include the proper unit of measure.
Answers
Answer: 19.3
Explanation:
can someone explain this better and simpiler?
Answers
Response:
Sorry but I think you forgot to attach or include something, thanks for the points tho!
Other:
Brainliest? Thanks!
A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
65.0°C
343°C
17.5°C
1.16°C
614°C
Answers
Answer: 343 Celsius
Explanation:
Gay lussac law
T2=T1V2/V1 Temp must be in Kelvin
T2= 308.15 X 9.00 / 4.50 =616.30 K - 273.15 to get back in celsius
=343.15 C
Pls help I’ll give brainly
Answers
How does temperature of land far from water compare to that of land near water?
The temperature of land far from water is hotter than land near water.
The temperature of land far from water is less stable compared to land near water.
The temperature is similar for land both near and far from water.
The temperature is either too hot or too cold near water.
Answers
The temperature of land far from water is hotter than land near water.
Why the temperature of land far away from water different from land near water?The lower heat capacity of land often allows them to cool the nearby water temperature so it takes less energy to change the temperature of land compared to water bodies. This means that land heats and cools more quickly as compared to water. This difference affects the climate of different areas on Earth. Large bodies of water like oceans, seas and large lakes can affect the climate of the nearby regions such as coastal regions. Water heats and cools more slowly than land regions. The coastal regions will stay cooler in summer season and warmer in winter season, which creates moderate climate on the coastal regions.
So we can conclude that the temperature of land far from water is different from land near water because of cooling effect of water bodies.
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In the following reaction how many moles of NaCI are needed to produce 5.4 miles of Na2O
NaCI+MgO= Na2O+MgCI2
Answers
To produce 5.4 moles of \(Na_{2} O\) in the given reaction, 10.8 moles of NaCl are required.
The given chemical equation is a balanced equation, which means it represents the stoichiometric relationship between the reactants and products involved in the reaction.
The coefficients of the balanced equation represent the number of moles of each reactant and product involved in the reaction.
In this case, the equation is:
2 NaCl + MgO → \(Na_{2} O\) + \(MgCl_{2}\)
From the equation, we can see that 2 moles of NaCl are required to produce 1 mole of . Therefore, to produce 5.4 moles of \(Na_{2} O\), we need to use stoichiometry to determine the amount of NaCl required.
We can use the following formula to calculate the number of moles of NaCl required:
moles of NaCl = moles of \(Na_{2} O\) × (2 moles NaCl / 1 mole \(Na_{2} O\))
Substituting the given values, we get:
moles of NaCl = 5.4 moles \(Na_{2} O\) × (2 moles NaCl / 1 mole \(Na_{2} O\)) = 10.8 moles NaCl
Therefore, we need 10.8 moles of NaCl to produce 5.4 moles of \(Na_{2} O\) in the given reaction.
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will henry's law not be applicable if the solubility of the gas is very high
Answers
Answer:
No
Explanation:
Henry’s law is a gas law which states that at the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant. The constant of proportionality for this relationship is called Henry’s law constant (usually denoted by ‘kH‘). The mathematical formula of Henry’s law is given by:
P ∝ C (or) P = kH.C
Where,‘
P’ denotes the partial pressure of the gas in the atmosphere above the liquid.‘C’ denotes the concentration of the dissolved gas.‘kH’ is the Henry’s law constant of the gas.Limitations of Henry’s Law
This law is only applicable when the molecules of the system are in a state of equilibrium.Henry’s law does not hold true when gases are placed under extremely high pressure.The law is not applicable when the gas and the solution participate in chemical reactions with each other.To change from one unit to another in the metric system, multiply or divide by multiples of what number?
Answers
Answer:
10
Explanation:
no explanation need thats the right answer i gotchu g
Answer:10
Explanation:
no explanation need thats the right answer
What is the oxidation number of chlorine in KClO3?
Group of answer choices
A. +5
B. +1
C. -5
D. -1
Answers
The oxidation number of chlorine in KClO3 is +5 (option A).
How to calculate oxidation number?The oxidation number of an element is the hypothetical charge of an atom within a molecule.
The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:
The oxidation number of the elements in KClO3 is as follows:
K = +1Cl = xO = -21 + x - 2(3) = 0
x - 5 = 0
x = +5
Therefore, the oxidation number of chlorine in KClO3 is +5.
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Which statement describes gases
according to kinetic molecular theory?
A. The gas particles have essentially zero volume and no attraction
for one another.
B. The gas particles have a large volume and strong attraction for
one another.
C. The gas particles have a small volume and strong attraction for
one another.
D. The gas particles have a large volume and weak attraction for one
another.
Answers
Answer:A. The gas particles have essentially zero volume and no attraction
for one another.
Explanation:
Based on this chart, which of the following statements describes sources of
energy in the United States?
Sources of Energy
Petroleum
3796
Other
91%
Natural Gas
24%
Renewable
Energy
7%
Coal
2396
*Nuclear
Electric Power
8%
A. Most energy comes from nuclear power and renewable sources.
B. Most energy comes from nonrenewable energy sources.
C. Most energy comes from sources in the solid phase.
D. Most energy comes from greenhouse gases.
Answers
Answer:
B. Most energy comes from non-renewable sources
Explanation:
A P E X
In United States Most energy comes from non-renewable energy sources, as petroleum coal and others has the highest consumption in the given chart
What is the energy source in US?In the given chart, the energy consumption in US is based on Petroleum, coal and others the highest consumption pattern as compared to other energy sources
Hence, most energy in the US is from non-renewable energy sources
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How many moles of the excess reagent would there be if 2.8mol of N2 were reacted with 15.1mol of H2O?
N2+4H2O ---> 2H2O2+N2H4
Answers
The number of moles of the excess reagent there would be is 3.9 moles
From the question,
We are to determine the number of moles of the excess reagent there would be.
The given balanced chemical equation is
N₂ + 4H₂O → 2H₂O₂ + N₂H₄
This means,
1 mole of N₂ is required to react completely with 4 moles of H₂O
Now,
If 1 mole of N₂ is required to react completely with 4 moles of H₂O
Then,
2.8 moles of N₂ will react completely with 11.2 moles of H₂O
∴ H₂O is the excess reagent
Number of moles of H₂O that would remain = 15.1 mol - 11.2 mol
Number of moles of H₂O that would remain = 3.9 mol
Hence, the number of moles of the excess reagent there would be is 3.9 moles
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Which of the following statements about combination reactions is not true?
A magnesium reacts with oxygen to form magnesium oxide
B the reaction of nonmetals with each other forms a molecular compound
C a combination reaction is also called a retrosynthesis
D sodium and chlorine react to form a compound
Answers
Statement C is not true. A combination reaction is not called retrosynthesis.
Retrosynthesis is a term used in organic chemistry to describe the process of planning the synthesis of a complex molecule by breaking it down into simpler precursor compounds. On the other hand, a combination reaction refers to a chemical reaction where two or more substances combine to form a single compound.
Examples of combination reactions include the reactions mentioned in statements A and D, where magnesium reacts with oxygen to form magnesium oxide and sodium reacts with chlorine to form sodium chloride, respectively.
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A gas is heated from 246 K to 289 K while its volume is increased from 22.0 L to 30.5 L by moving a large piston within a cylinder. If the original pressure was 0.98 atm, what would be the final pressure?
Answers
To determine the final pressure of the gas, we can use the combined gas law equation:
P1 * V1 / T1 = P2 * V2 / T2
where:
P1 = initial pressure
V1 = initial volume
T1 = initial temperature
P2 = final pressure (what we want to find)
V2 = final volume
T2 = final temperature
Given:
P1 = 0.98 atm
V1 = 22.0 L
T1 = 246 K
V2 = 30.5 L
T2 = 289 K
Plugging in the values into the equation, we have:
0.98 atm * 22.0 L / 246 K = P2 * 30.5 L / 289 K
Now we can solve for P2:
P2 = (0.98 atm * 22.0 L * 289 K) / (246 K * 30.5 L)
P2 = 0.98 * 22.0 * 289 / (246 * 30.5)
P2 ≈ 0.998 atm
Therefore, the final pressure of the gas would be approximately 0.998 atm.
When a 8.80-mg sample of a compound containing carbon is burned completely, 19.1 mg of carbon dioxide is produced. What is the mass percentage of carbon in the compound?
Answers
The mass percentage of carbon in the 8.80 mg sample of the compound is 59.2%
How do I determine the mass percentage of carbon?We'll begin by obtaining the mass of carbon in the compound. details below:
Mass of CO₂ = 19.1 mgMolar mass of CO₂ = 44 g/mol Molar of C = 12 g/mol Mass of C =?Mass of C = (12 / 44) × 19.1
Mass of C = 5.209 mg
Finally, we shall determine the mass percentage of carbon, in ompound. This is shown below:
Mass of compound = 8.80 mgMass of carbon in compound = 5.209 mgMass percentage of carbon = ?Mass percentage of carbon = (mass of carbon / mass of compound) × 100
Mass percentage of carbon = (5.209 / 8.8) × 100
Mass percentage of carbon = 59.2%
Thus, the mass percentage of carbon is 59.2%
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2ch4 and c2h8 how are they different
Answers
Answer:
Explanation:
Both 2CH4 and C2H8 have the same number and kind of elements. But practically, 2CH4 will be existing but C2H8 cannot exist.
two people share proceeds of a business venture in the ratio 2:3 if the proceeds came to GHS 2,350,000. How much does each get.
Answers
Answer:
Explanation:
Total Ratio, thus 2+3 = 5 = 2,350,000
2/5 × 2,350,000 = 940,000
3/5 × 2,350,000 = 1,410,000
Therefore the money was shared at GHS 940,000 and GHS 1,410,000 among the two.
Look at the structure of ethane below and answer the following questions:
A. Calculate the electronegativity difference between the C and H atoms using the table below.
B. Where would the partial + and - changes be?
C. Is the ethane molecule more or less polar than water? Why or why not?
D. If the oceans were filled with ethane rather than water how might they be different? (Hint: think about hydrogen bonding)
Answers
The Electronegativity Difference between the C and H atoms in ethane would be 0.35.
The structure of ethane is as follows:A) Electronegativity of Carbon (C) is 2.55, and Hydrogen (H) is 2.20. Electronegativity Difference (ΔEN) = 2.55 - 2.20 = 0.35B) There would be a partial negative charge on the Carbon atom, and there would be a partial positive charge on the Hydrogen atoms.C) The ethane molecule is less polar than water. This is because the electronegativity difference between the Carbon and Hydrogen atoms is low (0.35) in ethane, whereas the difference between the Oxygen and Hydrogen atoms is high (1.4) in water. Due to the high electronegativity difference in water, it creates a dipole moment, making it a polar molecule. Whereas ethane has no dipole moment and is considered a nonpolar molecule.D) If the oceans were filled with ethane instead of water, then there would be no hydrogen bonding. As a result, many of the physical properties of the ocean would be different.
For example, the freezing point of the ocean would be much lower because of the weak intermolecular forces between ethane molecules. Due to the absence of hydrogen bonding, the viscosity of the oceans would be less than that of water, leading to easier movement of organisms.
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How does sickle cell anemia effect homostasis?
What is the possibility sickle cell anemia is passed on?
How many people get this disease? How common is this disease? Who is most likley to get it?
What is the diagnosis for sickle cell anemia?
Answers
Sickle cell anemia is a genetic blood disorder that affects shape and function of red blood cells.
How does sickle cell anemia effect hemostasis?Sickle cell anemia is a genetic blood disorder that affects the shape and function of red blood cells. Hemostasis refers to process of maintaining balance between clotting and bleeding and sickle cell anemia can disrupt this balance in several ways.
One of the main effects of sickle cell anemia on hemostasis is that it can cause Vaso-occlusion, which is blockage of small blood vessels by sickle cells. This can cause tissue damage, inflammation and pain, which in turn can trigger an overactive clotting response.
Sickle cell anemia is caused by mutations in HBB gene, which provides instructions for making protein called hemoglobin.
Sickle cell anemia is most commonly found in people of African descent, although it can also occur in people of Hispanic, Middle Eastern, and Mediterranean ancestry.
Diagnosis of sickle cell anemia involves blood test to look for the presence of sickle hemoglobin.
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A sample of gas occupies a volume of 67.5 mL . As it expands, it does 131.0 J of work on its surroundings at a constant pressure of 783 Torr . What is the final volume of the gas g
Answers
Answer:
The final volume \(V2=1.3175L\)
Explanation:
between work ( w), pressure ( P ) and volume ( V ) is the following:
w=−PΔV
where,
ΔV=V2−V1
It was stated that the gas is expanding, then the work is done by the system and it is of a negative value .
Note that work, should be expressed in 1L⋅atm=101.3J
CHECK THE ATTACHMENT FOR DETAILED EXPLATION
How many grams of NaOH are needed to make 100. mL of solution with a concentration of 1.5 M?
Answers
To create 100 mL of solution with a concentration of 1.5 M, 6.00 grams of NaOH are required.
The amount of NaOH needed to make 100. mL of solution with a concentration of 1.5 M can be calculated using the formula:
mass = molarity x volume x molar mass
where:
molarity = 1.5 M (given)
volume = 100. mL = 0.1 L (given)
molar mass of NaOH = 40.00 g/mol (from periodic table)
Substituting the values, we get:
mass = 1.5 mol/L x 0.1 L x 40.00 g/mol
mass = 6.00 g
Therefore, 6.00 grams of NaOH are needed to make 100. mL of solution with a concentration of 1.5 M.
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Pls help I’m failing
Answers
This is probably something you learned in elementary school: Rivers almost never flow in a straight line. Instead, they twist and turn along serpentine paths
-------
curved
Which of the following is not a postulate of the kinetic molecular theory?
a) the absolute temp of a substance is equal to the average kinetic energy of its particles
b0 the energy of a gas molecule is determined by quantum mechanics
c/ gas molecules travel in random, straight paths
d) the collisions between gas molecules are elastic
Answers
Explanation:
Which of the following is not a postulate of the kinetic molecular theory?
Answer is
option D. the collisions between gas molecules are elastic
Hope it will help you
a change of state does not affect an object's what.
Answers
Answer:
Mass
Explanation: