Consider the diels–alder reaction shown. Draw the structures of the diene and dienophile that yield the enantiomeric products in the diels–alder reaction and consider whether an endo or exo addition occurs.

Answer:NH4, because nitrogen needs four electrons, and each hydrogen needs one electron.

Explanation:

Answer:

Synthesis is the Chemical reaction

Answer:

This question is incomplete because of the absence of the diagram

Explanation:

The absence of the diagram makes the question incomplete, but it appears as if the content of the diagram has been described in the question (which is not totally clear).

The description provided in the question suggests the loss of a water during the formation of a triglyceride. This process described here is called dehydration synthesis. Dehydration synthesis is the process of joining two substances/compounds together leading to the loss of water molecule in the process.

From the explanation above, the correct option is 2. The fat molecule being formed is the triglyceride (through the process of dehydration synthesis).

The reaction represented by the equation CH_4 + 2 O_2 → CO_2 + 2H_2O is a combustion reaction.

A combustion reaction is a type of chemical reaction in which a substance reacts with oxygen to produce heat and light. In this case, methane (CH_4) is reacting with oxygen (O_2) to produce carbon dioxide (CO_2) and water (H_2O).

Combustion reactions are typically exothermic, meaning they release energy in the form of heat and light. They are often accompanied by a flame and are commonly observed in processes such as burning of fuels, such as natural gas, gasoline, or wood.

In this specific reaction, methane (CH_4) is the fuel that undergoes combustion, combining with oxygen (O_2) to form carbon dioxide (CO_2) and water (H_2O). The coefficients in front of the molecules indicate the stoichiometric ratio, showing that one molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.

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Answer:

.084 M

Explanation:

Molar mass of sucrose = 342.3

The formula to find molarity is moles of solute / liters of solution

Since we need to turn grams to moles for this equation we do 104 / 342.3 = 0.304

Now we can use the equation listed above. .304 / 3.6 = 0.084 M

Answer:

More than 50% of the 100 billion stars in the Milky Way galaxy have at least one planet orbiting.

Explanation:

This is False so this would be your Answer

Answer: planets orbiting stars in the habitabke zone are likely to have life existinv on them

Explanation:

because it is false and i took the quiz

When alkene B is reacted with ozone, followed by Zn and H,O, two products will form.

Ozonolysis is a chemical reaction where an ozone molecule cleaves into two molecules of oxygen. Alkenes and alkynes undergo ozonolysis upon treatment with ozone. The reaction proceeds via a cyclic intermediate called molozonide which is further converted to carbonyl compounds. A variety of products are produced by ozonolysis of alkenes, including aldehydes, ketones, carboxylic acids, and peroxides.

When alkenes are treated with ozone and followed by zinc and water, it is known as reductive ozonolysis. The reaction proceeds as shown below: The first step involves the reaction of ozone with an alkene to form a molozonide intermediate. In the next step, the molozonide is reduced by zinc and water to form aldehydes or ketones. So, when alkene B is reacted with ozone, followed by Zn and H,O, two products will form. Answer: 2 products.

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Answer:

the nobel gases are unreactive bcz it alredy has stable electronic configuration due to which it neither donate nor receive electrons during the chemical reaction so ,it is are unreactive..

Answer:

Noble gases are nonreactive because their duplet and octet is complete. They no more need any electron to complete their duplet or octet. Elements are usually reactive because they tend to lose and gain electrons and Since noble gases have no tendency to gain or lose electrons, They are inert, noble and nonreactive.

There are three subshells that are attached to the electron at the 4p level.

The term orbital refers to the region in space where there is a high probability of finding an electron. We know that in the atom, there is an arrangement of the electrons into orbitals. Each of the orbitals have a specific energy. The energy that is available to the orbital is dependent on the value of the principal quantum number n as it species the distance of the orbital from the nucleus.

In the case of the electron that has the designation of quantum numbers n = 4, l = 1, this electron is found in the 4p level and there are three subshells that are attached to the electron at the 4p level.

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The decreasing order of ionization energy will be Mg >Al >P>K.

Ionization energy sometimes referred to as ionization potential, would be the amount of energy it takes to eliminate an electron from a single, isolated atom or molecule.

On moving top to bottom in the periodic table, ionization energy will decrease rapidly.

Al =13 (group 3)

P =15 (group 5)

Mg =12 (group 2)

K =19 (group 1)

The decreasing order of ionization energy will be Mg >Al >P>K.

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Answer:We can use the ideal gas law and the definition of vapor pressure to solve this problem.

First, we need to convert the vapor pressure from mmHg to atm:

565 mmHg = 0.743 atm

Next, we can use the ideal gas law to calculate the number of moles of gas in the flask:

PV = nRT

n = PV/RT

n = (0.743 atm) x (15.0 L) / [(0.08206 L·atm/mol·K) x (297 K)]

n = 0.436 mol

Since the molar mass of compound X is 84.91 g/mol, the mass of the gas in the flask is:

m = n x M

m = 0.436 mol x 84.91 g/mol

m = 37.0 g

Therefore, the mass of the liquid in the flask is:

50.0 g - 37.0 g = 13.0 g

So, the mass of the liquid once equilibrium is reached will be 13.0 g.

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The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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In 1933, the initial rock sample contained 11.29 grains of strontium-90.

The half-life of strontium is 28.8 years. Therefore,

1999 - 1943 = 56 years.

1.94 half-lives for 56 / 28.8

As a result, for each half-life that passes, the radioisotope's remaining amount will double. time-traveling backward.

The quantity left will therefore increase by 1.94 times when time is advanced by 1.94 half-lives.

Consequently, the amount left over in 1943 is

3.0 × (1.94)² = 11.29 grams

Nuclear fallout contains the radioactive element strontium-90, a byproduct of nuclear reactors. The half-life of it is 28 years.

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Explanation:

Answer. What comes in contact with Sodium Hydroxide to form soap and glycerine it is a chemical change because you cannot reverse this change and also the products formed are the results of a chemical reaction

Answer:

Its a chemical change because its property is changed.

Explanation:

Answer:

A

Explanation:

Answer:

a

Explanation:

The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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Because supergiants are so massive, the core temperature gets much hotter than in giants, so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.

Answer:

because the core tempature gets much hotter.

Explanation:

so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.

The molarity of the HCl sample is 1.0 M.

In a titration, the moles of acid are equal to the moles of base at the equivalence point.

We can use this principle to calculate the molarity of the acid (HCl) from the volume and concentration of the base (NaOH) used in the titration.

First, we need to calculate the number of moles of NaOH used in the titration:

moles of NaOH = M x V = 0.20 M x 0.025 L = 0.005 mol

Since NaOH and HCl react in a 1:1 molar ratio, the number of moles of HCl present in the sample is also 0.005 mol.

Now we can calculate the molarity of HCl using the number of moles and the volume of the HCl sample used in the titration:

molarity of HCl = moles of HCl / volume of HCl sample

molarity of HCl = 0.005 mol / 0.005 L

molarity of HCl = 1.0 M

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When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases.

A buffer is a solution of a weak acid and its conjugate base that prevents changes in pH when small amounts of strong acid or base are added. Buffer systems protect organisms from pH changes by regulating and neutralizing acids and bases that enter or are produced by cells.

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases. To balance the excess hydrogen ions, carbonic acid (H2CO3) is formed from carbon dioxide (CO2) and water (H2O). Carbonic acid then decomposes to form bicarbonate ions and hydrogen ions, and the pH of the blood is returned to normal. The bicarbonate ions act as a base, neutralizing the excess hydrogen ions that cause the blood to become more acidic. This is called the bicarbonate buffer system. Lactic acid is produced during intense exercise when the body doesn't get enough oxygen to meet its energy needs. The buildup of lactic acid in muscles can cause fatigue and muscle soreness. The carbonic acid/bicarbonate buffer system can also help to buffer the excess lactic acid produced during exercise, preventing the blood from becoming too acidic.

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Answer:

longer, shorter

Explanation:

A carbon-carbon double bond is longer than a carbon-carbon triple bond, and shorter than a carbon-carbon single bond

Answer:

try using this calculator

wolfram alpha lewis structure calculator

Explanation:

The best Lewis structure, adhering to formal charge rules, of IO₄⁻, has eight bonding pairs of electrons around the iodine atom.

A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule.

The shared pairs of electrons are drawn as lines between atoms, while lone pairs of electrons are drawn as dots next to atoms.

They also display the total number of lone pairs present in each of the atoms that constitute the molecule.

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Answer:

phosphorous

Explanation:

A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.

The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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A heterogeneous mixture is not uniform in composition. Hence, option C is correct.

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.

This substance is not an element or compound, because different components could be observed in the substance.  

A pure substance is made up of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

For example, aluminium is an element and ammonia is a compound.

This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.

Hence, this substance is a heterogeneous mixture.

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Answer:

heterogeneous mixture

Explanation: