Under basic conditions, the first step of nucleophilic addition to a ketone is: a. Proton transfer to carbonyl oxygen b. Nucleophilic attack of the carbonyl carbon c. Formation of an enolate ion d. Formation of a hydrazone

Answers

Answer 1

option b, which states that the first step of nucleophilic addition to a ketone is nucleophilic attack of the carbonyl carbon.

This is because the carbonyl carbon has a partial positive charge due to the electronegativity of the oxygen atom, making it a target for nucleophilic attack.
why option a, c, and d are not correct is as follows:
- Option a, proton transfer to carbonyl oxygen, occurs after nucleophilic attack and leads to the formation of an alcohol.
- Option c, formation of an enolate ion, can occur after nucleophilic attack and proton transfer, but it is not the first step.
- Option d, formation of a hydrazone, is not a typical reaction for nucleophilic addition to a ketone.

the correct first step for nucleophilic addition to a ketone under basic conditions is nucleophilic attack of the carbonyl carbon.


In a nucleophilic addition reaction involving a ketone, the first step is the nucleophile attacking the carbonyl carbon. This is because, under basic conditions, the nucleophile (which is negatively charged or has a lone pair of electrons) is attracted to the partially positive carbonyl carbon, leading to the formation of a tetrahedral intermediate. The carbonyl oxygen will then accept a proton in a later step to complete the addition.

In basic conditions, the initial step in the nucleophilic addition to a ketone is the nucleophilic attack on the carbonyl carbon, forming a tetrahedral intermediate.

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Related Questions

I need help. How do you solve this ?

I need help. How do you solve this ?

Answers

Answer:

it's number four 122.36

Explanation:

54.87% of 223 is 122.36

What is a vapor?
A. A substance that forms a gas, but only at very high temperatures
OB. A substance that is always in the solid or liquid phase at room
temperature
C. A substance that has a much higher melting point and boiling
point than other similar substances
D. A substance that is in the gas phase at a temperature at which it
would normally be a solid or liquid

Answers

According to the research, a vapor is a substance that is in the gas phase at a temperature at which it would normally be a solid or liquid.

What is a vapor?

It is the state in which a gas is found when it is at a level below its critical point.

A vapor is the result of heating an element that, at room temperature, is usually a solid or liquid.

Therefore, we can conclude that according to the research, a vapor is a substance that is in the gas phase at a temperature at which it would normally be a solid or liquid.

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What are the 7 main properties of matter?

Answers

Answer:Color, Density, Volume, Mass, and Boiling point. These are 5 3 more to go!

Explanation:

Color (intensive), Density (intensive), Volume (extensive), Mass (extensive) , Boiling point (intensive), Melting point (intensive) are the 7 main properties of matter .

What are  properties of matter?

Any attribute that can be measured, including an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, is referred to as a property of matter.

Short answer: What is the matter?

The term "matter" refers to a substance that is composed of several kinds of particles, occupies space, and has inertia. The different kinds of particles each have a unique mass and size, according to the fundamentals of current physics.

                           The electron, proton, and neutron are three of the most prevalent instances of material particles.

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is boiling a physical, or chemical change?(Worth 50 POINTS!)

Answers

Answer:

It is a physical change, because you DID NOT chemically change the waters compound just by boiling it.

Explanation:

I hope this helps!

Answer:

Boiling is a physical change!

(Edited bc the person who commented told me it was physical and not to make anyone being confused when the look at this post so... yeah)

When most liquids freeze, explain what happens to the motion and the space between the atoms.

Answers

Answer:

atoms relative motion slow down and begin to vibrate in place

Question Two: (3 points) For an FCC crystal: calculate the density of atoms (atoms/a² where a is the lattice constant) for the (100), (110) and (111) planes. az фоллоизобра

Answers

For an FCC crystal: calculate the density of atoms (atoms/a² where a is the lattice constant) for the (100), (110) and (111) planesThe unit cell of a FCC crystal is shown below:Here, each corner atom contributes 1 atom, and each face atom contributes 1/2 atoms.

For (100) plane:Length of unit cell along (100) plane direction = a Density of atoms = No. of atoms / Area of the plane Area of the plane = a²Density of atoms for (100) plane = 4 / a²For (110) plane:Length of unit cell along (110) plane direction = a√2Density of atoms = No. of atoms / Area of the plane Area of the plane = a x a√2Density of atoms for (110) plane = 2 x 2 / (a x a√2) = 4√2 / a²

For (111) plane:Length of unit cell along (111) plane direction = a√3Density of atoms = No. of atoms / Area of the plane Area of the plane = a²√3/2 Density of atoms for (111) plane = 3 x 4 / (a²√3) = 4√3 / a²Hence, the density of atoms for the (100), (110) and (111) planes in an FCC crystal are as follows:For (100) plane: 4 / a²For (110) plane: 4√2 / a²For (111) plane: 4√3 / a².

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A scuba diver's tank contains 1. 47 moles of o2 and 5. 53 moles of he at the end of a dive. If the pressure of the gas mixture is 12. 1 atm, what is the partial pressure of he in the tank?.

Answers

The partial pressure of helium, He in the tank, given that the tank contains 1.47 mole of O₂ and 5.53 moles of He, is 9.559 atm

How do I determine the partial pressure of He?

To calculate the partial pressure of He in the tank, we must first obtain the mole fraction of He. Details on how to obtain the mole fraction of He is shown below:

Mole of O₂ = 1.47 mole Mole of He = 5.53 moles Total mole = 1.47 + 5.53 = 7 molesMole fraction of He =?

Mole fraction of He = Mole of He / total mole

Mole fraction of He = 5.53 / 7

Mole fraction of He = 0.79

Now, we can obtain the partial pressure of He. This is illustrated below:

Mole fraction of He = 0.79Total pressure in tank = 12.1 atmPartial pressure of He in tank =?

Partial pressure = mole fraction × total pressure

Partial pressure of He = 0.79 × 12.1

Partial pressure of He = 9.559 atm

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what is the buffer component ratio, (ch3ch2coo-)/(ch3ch2cooh) of a propanoate buffer that has a ph of 5.13. ka of ch3ch2cooh is 1.3 x 10-5.

Answers

The buffer component ratio ([CH3CH2COO-]/[CH3CH2COOH]) is approximately 1.74.

The buffer component ratio can also be interpreted as the ratio of the concentration of the conjugate base ([A-]) to the concentration of the weak acid ([HA]) in the buffer solution.

The buffer component ratio of a propanoate buffer can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

In this case, pH = 5.13, pKa = -log(1.3 x 10^-5) ≈ 4.89, [A-] = [CH3CH2COO-], and [HA] = [CH3CH2COOH]. Rearrange the equation to solve for the buffer component ratio:

5.13 = 4.89 + log([CH3CH2COO-]/[CH3CH2COOH])

0.24 = log([CH3CH2COO-]/[CH3CH2COOH])

To find the ratio, take the antilog:

10^0.24 ≈ 1.74

Therefore, the buffer component ratio ([CH3CH2COO-]/[CH3CH2COOH]) is approximately 1.74.

The buffer component ratio is greater than 1, indicating that the concentration of the conjugate base is higher than the concentration of the weak acid.

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write down the needed and important water in our life?​

Answers

Answer:

Because 60 percent of our body weight is made up of water. Our bodies use water in all the cells, organs, and tissues, to help regulate body temperature and maintain other bodily functions.

Explanation:

Our bodies is made out of 60% water and even if the percentage goes down 1% we could faint. 5% and we could die. We wash off with water to clean ourselves. We use water to cook like boiling pasta. Water is a necessity not just humans need it but plants need it to grow and germinate. Hope this helps sorry it took so long. I had a fight with autocorrect.

What is the concentration of the solution, expressed in percent by mass, that is formed from the mixing of 7.8 g from nacl into a 134.0 g of h2o

Answers

Answer:

Explanation:

\(\frac{7.8}{7.8+134} \times 100 \approx \boxed{5.5\% \text{ (to 2 sf)}}\)

Many watches are powered by small, flat batteries called button cells. One common type of button cell contains the metal zinc. When zinc in the battery combines with oxygen in the air, zinc oxide forms. This process generates the electricity that powers the watch. is this a product or reactant

Answers

The electricity generated that powers the watch by zinc in the battery combines with oxygen in the air, zinc oxide forms reaction is a product.

Zinc-air batteryIn zinc -air battery oxidation of zinc to zinc oxide in presence of oxygen from air takes place. These batteries are cost-effective and contain more density of energy as compared to others. When compared with lithium batteries these are with more capacity, environmental safe, cost-effective and easy to produce these are widely used. Metal-air batteries fueled by the oxidation of zinc with oxygen from the air include zinc-air batteries (non-rechargeable) and zinc-air fuel cells (mechanically rechargeable). These batteries are produced at comparatively low costs and have great energy densities.Effective anode materials must be developed for next-generation lithium-ion batteries (LIBs). Due to a number of intriguing characteristics, including its high theoretical capacity, simplicity in synthesis, environmental friendliness, and low cost, zinc oxide (ZnO) has been regarded as a useful material.In addition, compared to the majority of primary batteries, zinc-air batteries offer a high volumetric energy density. Such batteries have a number of drawbacks, including a reliance on ambient conditions, a propensity to dry up when exposed to air, flooding potential, a finite output, and a brief active life.

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what is the mass of water which can dissolve 8.6 g of lithium chloride in a 6.70% by mass solution

Answers

Answer:

~120 grams water

Explanation:

% LiCl = (Mass LiCl) / (Mass of Soln) x 100%

= Mass LiCl / (Mass H₂O + Mass LiCl) x 100% = 6.7% (divide both sides by 100%)

=> Mass LiCl / Mass H₂O + Mass LiCl = 0.067

=> Mass LiCl = 0.067(Mass H₂O) + 0.067(Mass LiCl)

Solve for Mass H₂O:

=> Mass LiCl - 0.067(Mass LiCl) = 0.067(Mass H₂O)

=> Mass H₂O = (Mass LiCl - 0.067(Mass LiCl) / 0.067

= 8.6g - 0.067(8.6g) / 0.067 = 8.0238g / 0.067 = 119.76g H₂O = ~120grams

glycogen is chemically a reducing polysaccharide. why could you make the argument that physiologically glycogen is not a reducing sugar?

Answers

By storing glucose while rates are elevated and releasing it when levels are low, glycogen acts as the body's principal blood glucose buffer.

What does the scientific term "chemical" mean?

A chemical is any substance whose composition is known. A chemical always contains of the same "substance," to put it another way. Water is one of the substances found in nature. Chlorine and other chemicals are generated (used for bleaching fabrics or in swimming pools).

What does the term chemically same mean?

Chemical similarity, also known as molecular similarity, is the commonality of chemical elements, molecules, or chemical compounds in terms of their structural or functional properties, i.e., the impact that the chemical component has had on reaction ( 1 in inorganic or biological environments.

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How can you use IR spectroscopy to distinguish between the isomers, CH3CH2OH and CH3OCH3? Select one: a. an absorption at 3070 cm -1 b. an absorption at 1100 cm -1 C. an absorption at 1500 cm -1 d. an absorption at 3410 cm - 1

Answers

The correct answer is d. an absorption at 3410 cm-1.

Infrared (IR) spectroscopy can be used to identify functional groups in organic molecules. The OH functional group in alcohols exhibits a characteristic absorption band around 3300-3600 cm-1. This absorption is due to the stretching vibration of the O-H bond.

In the isomer CH3CH2OH (ethanol), there is an -OH group present which will give rise to a strong absorption at around 3410 cm-1. In contrast, in CH3OCH3 (dimethyl ether), there is no -OH group, and therefore no absorption at this frequency.

                                                                       

Absorption at 3070 cm-1 (option a) is associated with the C-H stretch of an aromatic ring or the C-H stretch of an alkyne, and is not useful for distinguishing between these two isomers.

Absorption at 1100 cm-1 (option b) is associated with the C-O stretch of an ether, which is present in CH3OCH3, but also in CH3CH2OH, making it non-specific.

Absorption at 1500 cm-1 (option c) is associated with the C=C stretch of an alkene or the N-H bend of an amine, and is not useful for distinguishing between these two isomers.

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Pls Answer this giveing brainilest an 20 points

Pls Answer this giveing brainilest an 20 points

Answers

Answer:

Deserts and oceans appear to be far from one another will little in common, but in fact, they're connected in an intresting way.Water from the open evaporates into clouds that travel and eventually empty the water onto the land,creating much-needed sources of water in dessert areas.Meanwhile,winds from the dessert sweep up billions of tons of dust intosky,at least a quarter of which falls into the ocean and provides nutrients for marine life.

Explanation:

Which factors are common to both gradualism and punctuated equilibrium?

Answers

Gradualism and Punctuated equilibrium are two theories that explain how evolution occurs. While these two theories have differences, they also share certain similarities.

Factors that are common to both gradualism and punctuated equilibrium include the following:

1. Natural selection: This is a significant mechanism in both gradualism and punctuated equilibrium. Natural selection refers to the process by which organisms with favorable traits are more likely to survive and pass on those traits to their offspring.

2. Adaptation: In both theories, the species that survive are those that are most adapted to the environment in which they live. The adaptation process takes place over a long time, either gradually or quickly.

3. Speciation: This refers to the formation of a new species. In both theories, it occurs when a population becomes isolated from the rest of the species and develops unique traits.

4. Heredity: Both theories acknowledge that the offspring inherit traits from their parents. The traits that are passed down can either be favorable or unfavorable.

5. Evolution: Gradualism and punctuated equilibrium both acknowledge that evolution is a slow process that takes place over a long time.The above factors are common to both gradualism and punctuated equilibrium. These similarities show that despite the differences, these theories have a lot in common.

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Calculate the average reading for all three trials for both the wet bulb and dry bulb thermometers. Convert the average
temperatures for both thermometers to Celsius using this formula:
(°F - 32) = °C.

Answers

Answer: °32= 0 °C.

Explanation:

Answer:

Explanation:

Please add the temperature readings from all three trials for both thermometers. Will do the calculation with readings.

About two centuries ago, Benjamin Franklin showed that 1 teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0 x 10^4 squared meters = 2.47 acres, and that there is approximately 5 cubic centimeters in a teaspoon, what is the thickness of the layer of oil? How might this thickness be related to the sizes of molecules?

Answers

The thickness of the oil layer is approximately 1.6 x 10⁻⁷ meters.

To calculate the thickness of the oil layer, we first need to convert the area covered by the oil from acres to square meters.
0.5 acre = (0.5 acre / 2.47 acres) x 1.0 x 10⁴ square meters = 2.024 x 10³ square meters
Next, we'll convert the volume of the oil from teaspoons to cubic meters.
5 cubic centimeters = 5 x 10⁻⁶ cubic meters (since 1 cm^3 = 10⁻⁶ m³)
Now, we can calculate the thickness by dividing the volume of the oil by the area it covers:
Thickness = (5 x 10⁻⁶ cubic meters) / (2.024 x 10³ square meters) ≈ 1.6 x 10⁻⁷ meters

The thickness of the oil layer is extremely thin, around 1.6 x 10⁻⁷ meters. This thickness can be related to the sizes of molecules as it suggests that the oil layer might be just a few molecules thick. This phenomenon can be attributed to the strong cohesive forces between the oil molecules, allowing them to spread out thinly over a large area.

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The ____________ demonstrates the area where the chondrocytes die and are replaced by blood vessels and osteoblasts, which then form the final trabeculae and osteoclasts that refine the distal contours of the medullary chamber.

Answers

The process of endochondral ossification demonstrates the replacement of chondrocytes by blood vessels and osteoblasts, leading to the formation of trabeculae and osteoclasts. These osteoclasts refine the distal contours of the medullary chamber.

Endochondral ossification is an essential mechanism for bone development in vertebrates. It begins with the formation of a cartilage template, which is gradually replaced by bone tissue. During the process, chondrocytes in the center of the cartilage model undergo hypertrophy and die. This death of chondrocytes forms the primary ossification center, where blood vessels invade the cartilage. The invading blood vessels bring osteoblasts, which deposit bone matrix on the remaining calcified cartilage. These new trabeculae of bone form the early structure of the bone. As the bone continues to grow, osteoclasts remove and remodel the inner bone, refining its shape and forming the medullary chamber. The process of endochondral ossification is fundamental in the growth and development of long bones and plays a significant role in bone healing and fracture repair.

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PLEASE help me 10 points

PLEASE help me 10 points

Answers

Answer: A.) unsaturated

Explanation:

calculate the number of moles in 18.5 g of aluminum thiosulfate, Al2(S2O3)3

Answers

Answer:

0.05 mol

Explanation:

Moles = Mass / Mr (Relative formula mass)

Ar of aluminium = 27

Ar of sulphur = 32

Ar of oxygen = 16

Mr of Al2(S2O3)2 = (27×2)+((32×2)×3)+((16×3)×3)= 390

Moles = 18.5g / 390

Moles = 0.05 mol

identify ways to reduce the risk of liquid bumping while heating.

Answers

The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.

If the volume of the reaction vessel in part (a) was 3.60 ll , what mass of n2n2 was formed during the first 85.0 ss of the reaction?

Answers

If the volume of the reaction vessel is 3.60 liters and the reaction takes place for 85.0 seconds, the mass of N2 formed during the first 85.0 seconds of the reaction is approximately 4.0886 grams.

The mass of N2 formed during the first 85.0 seconds of the reaction, we need to use the volume of the reaction vessel and the stoichiometry of the reaction.

First, we need to convert the volume of the reaction vessel from liters to milliliters. Since 1 liter is equal to 1000 milliliters, the volume of the reaction vessel is 3600 ml.

Next, we need to use the ideal gas law to find the number of moles of N2 that reacted. The ideal gas law equation is PV = nRT, 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. Since we are given the volume and time, we can assume that the pressure and temperature are constant. Therefore, PV = nRT simplifies to V = nRT, where R is the gas constant.

Now, we need to rearrange the equation to solve for the number of moles, n. We have V = nRT, so n = V / RT. We can substitute the given values: n = 3600 ml / (0.0821 L·atm/mol·K * 298 K) = 0.1462 mol.

Finally, we can use the balanced chemical equation to determine the ratio of moles of N2 to the mass of N2. The balanced equation is N2 + 3H2 -> 2NH3. From the equation, we see that 1 mole of N2 produces 2 moles of NH3. Therefore, the mass of N2 is equal to the molar mass of N2 (28 g/mol) multiplied by the number of moles of N2: mass = 28 g/mol * 0.1462 mol = 4.0886 g.

In conclusion, if the volume of the reaction vessel is 3.60 liters and the reaction takes place for 85.0 seconds, the mass of N2 formed during the first 85.0 seconds of the reaction is approximately 4.0886 grams.

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Test Yourself
1- Which is larger:
a) Million or billion?
b) A part of million or a part of billion?
2- Which is more harmful: concentration of a poisonous substance (lead) in
drinking water to be a part of a billion or a part of a million?

Answers

Answer:

billion is larger \ part if billion

Which state of matter is characterized by molecules that are tightly packed together and hold their shape?

gas

solid

liquid

plasma​

Answers

Solids have tightly packed molecules

Answer: The answer is Solid

Explanation: :)

Question 15 of 25
What is the standard cell notation of a galvanic cell made with aluminum and
magnesium?
A. Al3+(aq) | Al(s) || Mg(s) | Mg2+(aq)
B. Mg2+(aq) | Mg(s) || Al(s) | A13+(aq)
C. Mg(s) | Mg2+(aq) || A13+(aq)| Al(s)
D. Al(s) | Al3+(aq) || Mg2+ (aq) | Mg(s)
SUBMIT

Answers

The standard cell notation of a galvanic cell made with aluminum and magnesium is option A. Al3+(aq) | Al(s) || Mg(s) | Mg2(aq).

The right side is the cathode and the left side is the anode. The cell is represented by the convention that the metal is written first, then the metal ions present in the electrolyte. And these two should be separated by a vertical line. Zinc becomes the cathode of the galvanic cell.

Galvanic cells consist of two different metal electrodes connected by a conductive solution electrolyte, which are also connected externally to complete an electrical circuit. Cell notation or cell representation in chemistry is a simple way of representing reactions in an electrochemical cell. The silver half-cell is reduced due to its high standard reduction potential. Tin half-cells are oxidized.

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Answer: C

Explaination:

8. A transform boundary, where one tectonic plate slides past another, is likely to result in
which of the following?
A. Frequent earthquakes
B. Rift valley formations
C. Intense weathering
D. Mountain building
9. A rising hot air balloon is acted on by a force pulling it upward and by the force of gravity
Nonton's law of inertia what will happen to the balloon

Answers

Answer:      A. Frequent earthquakes

Explanation:

a sample of co2 effuses from a container in 39 seconds. how long will it take the same amount of gaseous xe to effuse from the same container under identical conditions?

Answers

It would take about 22.7 seconds for the same amount of gaseous Xe to effuse from the same container under identical conditions.

The rate of effusion of a gas will be inversely proportional to the square root of its molar mass. This means that gases with lower molar mass will effuse faster than those with higher molar mass under identical conditions.

Let's denote the molar mass of CO₂ as MM(CO₂) and the molar mass of Xe as MM(Xe). We can use the following equation to relate the rates of effusion of two gases with different molar masses:

(rate of effusion of gas A) / (rate of effusion of gas B) = sqrt(MM(B) / MM(A))

In this case, we know that the rate of effusion of CO₂ is given as 1/39 (assuming the effusion rate is measured in units of volume per time). We want to find the time it takes for an equal amount of Xe to effuse from the same container under identical conditions. This means that the ratio of the effusion rates of Xe to CO₂ should be equal to 1, so we can set up the equation as follows:

1 / (1/39) = √(MM(CO₂) / MM(Xe))

Solving for the time it takes for Xe to effuse gives:

t(Xe) = t(CO₂) × (√(MM(CO₂) / MM(Xe)))

Substituting the values for MM(CO₂) and MM(Xe) gives:

t(Xe) = 39 s × (√(44.01 g/mol / 131.29 g/mol)) ≈ 22.7 s

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You would be most likely to use a slicing machine if you were using the __________ method to produce cookies.

Answers

You would be most likely to use a slicing machine if you were using the icebox method to produce cookies.

In the icebox method a type of cookie in which the dough is made, rolled into a stick, and refrigerated until the dough hardens. The dough can be removed from the refrigerator, cut into individual pieces, and then baked. The rest of the dough is returned to the refrigerator until needed.

Icebox method, also known as refrigerator cookies, are sliced ​​and baked cookies. The dough is formed into logs, chilled in the refrigerator (also called an icebox), sliced ​​, and then baked.

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Copper-64 is used in the form of copper acetate to study brain tumors. it has a half-life of 12.8 h. if you begin with 15.0 mg of 64 cu-labeled copper acetate, what mass remains after 64 hour?

Answers

After 64 hours, approximately 0.47 mg of Copper-64 labeled copper acetate remains.

To solve this problem, we need to use the concept of half-life, which is the amount of time it takes for half of the radioactive substance to decay.
First, we need to determine how many half-lives have passed in 64 hours. Since the half-life of Copper-64 is 12.8 hours, we can divide 64 by 12.8 to get 5.
This means that after 64 hours, Copper-64 has undergone 5 half-lives.
To determine the amount of Copper-64 that remains, we can use the following equation:
Final mass = initial mass x (1/2)^(number of half-lives)
Plugging in the given values, we get:
Final mass = 15.0 mg x (1/2)^5
Final mass = 15.0 mg x 0.03125
Final mass = 0.46875 mg = 0.47 mg

Therefore, after 64 hours, only 0.47 mg of Copper-64 labeled copper acetate remains.

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Do you have to cite information from a class? How high does the ball roll on its 5th time up the cylinders side? What is the largest freshwater lake in the worlds ? name it and where is it located? what does -4(2x+9) equal anybody else still in class?? A mixed economic system is best described an economy with a mix ofChoose matching definitionfacts and predictionsfree markets and government controldomestic and foreign buyersboth material and nonmaterial desires a client is placed on a low-sodium (1500 mg/day) diet. which client statement indicates that the nurse's nutrition teaching plan has been effective? to facilitate the success of this joint-venture, what are some of the ways in which the mobile technology manufacturers should collaborate with qc and its members? How do the elements of magical realism help disguise its critique of social or political institutions? which of the following is not a pattern observed in the solar system? are 5(8y - 8) and 40y - 40 equal? annuity repayment vs level principal repayment. can you compare these payments methods Match the pathway of the carbon cycle The photo doesnt fit but there is a D. D says I know lm not going to reach the stars if l dont pass math class. I just dont want to leave all this behind.Please help me! On January 1, Year 2002, Merrill Corporation issued $4,000,000 par value 20-year bonds. The bonds pay interest semi-annually on January 1 and July 1 at an annual rate of 8%. The bonds were priced to yieled (effective rate) 6% on the date of issue.Compute the issue price (cash proceeds) of the bonds on the date of issue. Calculate the required volume of methanol (in ml) to recrystallize 25 mg of benzoic acid at room temperature. A square matrix M is said to be skew symmetric if M = MT. Given that the 3 3 matrix A is symmetric and the 3 3 matrix B is skew symmetric, find the missing entries in the following matrices: A = 1-(-402) 0 - (-2,0) 6 B 3 -5 (1 point) State whether each of the following statements is true or false. If the statement is false, illustrate your argument with an example. (a) ( point) (A + B)(A B) = A B (b) ( point) If AB = 0 and A is invertible then B = 0 a. Find the magnitude of the force required to keep a 3700-pound car from sliding down a hill inclined at 5.30 from the horizontal. b. Find the magnitude of the force of the car against the hill. pounds. a. The magnitude of the force required to keep the car from sliding down the hill is approximately (Round to the nearest whole number as needed.) pounds. b. The magnitude of the force of the car against the hill is approximately (Round to the nearest whole number as needed.) What is the difference between the definitions for ray and line segment?Only the definition of ray relies on an understanding of two directions.Only the definition of line segment relies on an understanding of line.Only the definition of ray depends on an understanding of infinite.Only the definition of line segment depends on an understanding of point. The idea that political power should rest with the citizens instead of the government. what is this called ?