Devise a synthesis of each compound from benzene and organic alcohols containing four or fewer carbons. You may also use any required organic or inorganic reagents.

Answer:  0.428%

Explanation:  % Error = [(measured - Actual)/Actual]*100%

    (93.9g - 93.5 g)/93.5g = 0.428%

Answer:

+0.4

Explanation:

For all those Acellus kids XD

Answer:

its 210

Explanation:

Just add all atomic mass used in the formula together: 2*(14+16*3)+88= 2*62+88=124+88=210

Hope this was helpful

The relative formula mass of strontium nitrate Sr(NO₃)₂ is 210

The relative atomic masses of N, O and Sr are 14,16 and 88 respectively.

In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. Adding the atomic masses together gives the relative formula mass of a compound

So, relative atomic mass of Sr(NO₃)₂ is calculated as

88+ 2(14+16×3) = 210

The atomic mass constant (symbol: mu) is defined as being 1/12 th of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative atomic mass.

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Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium  = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

   Number of moles  = \(\frac{mass}{molar mass}\)  

   molar mass of He  = 4g/mol

  Number of moles  = \(\frac{4}{40}\)   = 0.1mole

So;

                  1 mole of gas at rtp occupies a volume of 22.4dm³

                0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

The temperature at the top of an atmosphere consisting of an ideal gas with constant density can be found using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Assuming the density of the gas is constant throughout the atmosphere, we can express the pressure as P = ρgh, where ρ is the density, g is the acceleration due to gravity, and h is the height.

Since the atmosphere is homogeneous, the pressure at the top (P_top) is the same as the pressure at the bottom (P_bottom), so we have P_top = P_bottom = ρgh.

Using the ideal gas law, we can write ρghV = nRT, where V is the volume of the gas.

Assuming the volume of the gas is constant, we can cancel out V, and rearranging the equation, we get T_top = (nRT_bottom)/(nR) = T_bottom.

Therefore, the temperature at the top of the atmosphere would be the same as the temperature at the bottom.

In practice, however, it is not possible for an atmosphere to have constant density all the way to the top. As we go higher in the atmosphere, the density decreases due to decreasing pressure and temperature. This is because gravity becomes weaker at higher altitudes. Therefore, in reality, the temperature would decrease as we move higher in the atmosphere.

So, while a homogeneous atmosphere with constant density all the way to the top cannot exist in practice, it can be considered as an idealized scenario for understanding certain aspects of atmospheric behavior.

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Answer:

An object that has a higher density than the liquid it's in will sink

Explanation:

hopefully I helped

The 5′ cap and poly-A tail protects the nascent mRNA from degradation and assists in ribosome binding during translation.

The eukaryotic pre-mRNA formed from transcription undergoes extensive processing before it is ready to be translated.

The additional steps involved in eukaryotic mRNA maturation create a molecule with a much longer half-life than a prokaryotic mRNA.

While the pre-mRNA is still being synthesized, a 7-methylguanosine cap is added to the 5′ end of the growing transcript by a 5′-to-5′ phosphate linkage. This moiety protects the nascent mRNA from degradation.

The poly-A tail protects the mRNA from degradation, aids in the export of the mature mRNA to the cytoplasm, and is involved in binding proteins involved in initiating translation.

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Oxide is used as a surfactant and a dehydrating agent while potassium hydroxide and methanol are reacted to create potassium methoxide. The approach has a long flow, challenging operation, and similar things.

The steps involved in producing potassium methylate with methyl alcohol and potassium hydroxide as the main raw ingredients are as follows: Add potassium hydroxide and methyl alcohol to the potassium methylate reactor at a predetermined molecular weight ratio. Dried methyl alcohol is added constantly from the reactor's bottom while being stirred and the reaction temperature is controlled. Adsorb the water produced by the reaction to produce methyl alcohol with a high water content. Feed the methyl alcohol with a high water content into the apparatus for rectification and dehydration. Process for making potassium methoxide.

the technical area first

The technique described in the invention produces potassium methoxide primarily from potassium hydroxide and methanol.

Additionally, background art. The production of goods like methyl formate, dimethylformamide, dimethyl carbonate, and others uses the potassium methoxide, a brand-new, very efficient organic and fine chemical catalyst. As a catalyst for the processing of edible fat and oil, it can also be used as an intermediate in the production of pesticides and drugs like vitamin A and sulfadiazine.

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Answer:

7 grams

Explanation:

The water evaporates leaving the same amount of salt behind

hope this helps...

a. There are 0.1596 moles of NaCl in 0.3 L of NaCl stock solution.

b. There are 0.1596 moles of NaCl in 2.1 L of NaCl dilute solution.

c. The concentration of NaCl in the final solution is 0.076 M.

Molarity is said to be the number of moles of solute per liter of solution. For example, when salt is dissolved in water, the salt becomes the solute and the water becomes the solution. Since, one mole of sodium chloride weighs 58.44 grams and dissolving 58.44 grams of NaCl in 1 liter of water makes a 1 molar solution, abbreviated as 1M.

c. Let's calculate the concentration of NaCl in the final solution:

M₁V₁ = M₂V₂

M₁ = Initial concentration of NaCl (0.532 M)

V₁ = Initial volume of NaCl (0.3 L)

M₂ = Final concentration of NaCl

V₂ = Initial volume of NaCl (2.0 L)

0.532 × 0.3 = M₂ × 2.1

M₂ = (0.532 × 0.3)/2.1

M₂ = 0.076 M

a. To calculate number of moles in 0.3 L of NaCl stock solution.

Molarity = Mole of solute/Volume of solution

0.532 = Mole of NaCl/0.3

Mole of NaCl = 0.532×0.3

Mole of NaCl = 0.1596 mol

b. To calculate number of moles in 2.1 L of NaCl solution.

0.076 = Mole of NaCl/2.1

Mole of NaCl = 0.076×2.1

Mole of NaCl = 0.1596 mol

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H2SO4 has a molecular weight of 98 g/mole. 98% concentrated sulfuric with a density of 1.84 g/mL is the usual source.

We would need 98 g for a 1 M solution in 1 L, but because this is for 500 mL, just 49 g of H2SO4 will be needed. Common concentrations of sulfuric acid are 78, 93, or 98 percent. Pure anhydrous sulfuric acid does not exist in nature due to its affinity for water. 35% sulfuric acid Fertilizers like ammonium sulfate and super-phosphate of lime are produced using solution. In the production of hydrochloric acid, sulfate salts, synthetic detergents, dyes & pigments, and medications, it is frequently employed.

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Answer:

D

I just got it right

Answer:

D

Explanation:

On edge

Answer:

your answer is C

Explanation:

The electron-dot structure of NH3 places one set of nonbonding electrons in the valence shell of the nitrogen atom. that means there are three bonded atoms and one single pair for a coordination number of four surrounding  the nitrogen, the same occurs in water to. along with the Lewis dot structure for ammonia, NH3. the non bonding atoms are basically like hydrogen atoms the try to refuse to bond and they can't be fused unless the right conditions are met.

The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.

In the Periodic Table, the Groups are the columns. For the Main-group elements, the group number coincides with the number of electrons in the valence shell.

Which of the following could be the subshell representation of an element of Group IV?

A. s². No, since there are 2 valence electrons.

B. s² p³. No, since there are 5 valence electrons.

C. s² p². Yes, since there are 4 valence electrons.

D. s² p¹. No, since there are 3 valence electrons.

The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.

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The chemical equation for the synthesis reaction of burning magnesium in the presence of oxygen can be summarized as: 2 Mg + O2 → 2 MgO

In this reaction, magnesium (Mg) reacts with oxygen (O2) to form magnesium oxide (MgO). The balanced equation shows that two moles of magnesium react with one mole of oxygen to produce two moles of magnesium oxide.

When magnesium is burned, it undergoes a redox reaction with oxygen. Magnesium atoms lose two electrons to form Mg2+ ions, while oxygen molecules gain four electrons to form O2- ions.

The resulting ions combine to form the ionic compound magnesium oxide (MgO), which is a white solid. The balanced equation reflects the stoichiometry of the reaction, indicating the correct ratio of reactants and products.

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Molar mass of Cu = 6.45x10^25 atoms.

The molar mass of Cu = 63.55g/mol.

Mass of Cu= ?

Thus, Mass of cu= Molar mass of Cu / The molar mass of Cu

                             = 6.45x10^25 atoms/ 63.55g/mol.

                              = 0.176 g

The chemical element copper has the atomic number 29 and the letter Cu, which comes from the Latin word cuprum.

It is an extremely high thermal and electrical conductivity metal that is soft, malleable, and ductile. Pure copper has a pinkish-orange tint when it is first exposed to the air.

Thus, Molar mass of Cu = 6.45x10^25 atoms.

The molar mass of Cu = 63.55g/mol.

Mass of Cu= ?

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A probing question that lies within the scope of physics could be: "What is the nature of dark matter and dark energy, and how do they influence the expansion of the universe?

Dark matter and dark energy are hypothetical forms of matter and energy that are believed to exist based on their observed gravitational effects on galaxies and the expansion of the universe.

Dark matter is thought to be a type of matter that does not interact with light or other electromagnetic radiation, while dark energy is an unknown form of energy that is causing the universe to expand at an accelerated rate.

Exploring the nature of dark matter and dark energy falls under the purview of physics because it involves understanding the fundamental forces and particles that govern the behavior of the universe.

Physicists study these phenomena by analyzing the gravitational effects they have on visible matter, conducting experiments to detect dark matter particles, and developing theoretical models to explain their properties and interactions.

Addressing this probing question requires the application of various branches of physics, such as cosmology, astrophysics, particle physics, and quantum mechanics.

Researchers employ observational data, theoretical frameworks, and advanced technologies to investigate the nature and origin of dark matter and dark energy, contributing to our understanding of the fundamental nature of the universe and its evolution.

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Answer:

see below

Explanation:

the charge of the atom is neutral because there are equal numbers of protons and electrons in an atom.

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please mark

Answer:

Hormones help regulate many bodily processes, such as appetite, sleep, and growth. Sex hormones are those that play an essential role in sexual development and reproduction. The main glands that produce sex hormones are the adrenal glands and the gonads, which include the ovaries in females and testes in males

Explanation:

Answer:

cooling of surroundings

Explanation:

Experimental social psychologists face a major ethical dilemma concerning the potential harm or discomfort caused to participants during research studies.

Research in experimental social psychology often involves manipulating variables or creating scenarios that can evoke negative emotions, induce stress, or compromise privacy.

This raises concerns about the well-being and rights of participants. While researchers strive to gather valuable insights into human behavior, they must carefully balance the benefits of knowledge with the potential risks and ethical implications of their studies.

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At pH c) 5.0 the solution is buffer. A buffer solution contains ethanoic acid and its conjugate base; the pKa of ethanoic acid is 4.74.

A buffer solution will work between +/- 1 unit of pH around its pKa value of weak acid. A buffer solution is most effective for both for acid addition and base addition when the pH near to pKa value of weak acid. It is far essential to have answers whose pH does now no longer alternate even at the addition of sturdy alkalis or sturdy acids. Such solutions are known as buffer solution. Buffer capability is the capability of a buffer technique to withstand alternate in its pH. The equation is given by, pH = pKa + log [Salt] / [Acid]

Thus, the pH of the buffer solution is c) 5.0.

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The reduction potential of ubiquinone/coenzyme Q is higher than complex I and lower than complex II of the electron transport system.

Complex I, also known as NADH dehydrogenase, is the first complex in the electron transport chain and accepts electrons from NADH, which has a higher reduction potential than UQ/Q. Therefore, the reduction potential of Complex I is higher than that of UQ/Q.

Complex II, also known as succinate dehydrogenase, is located in the mitochondrial inner membrane and accepts electrons from succinate, which has a lower reduction potential than UQ/Q. Therefore, the reduction potential of Complex II is lower than that of UQ/Q.

Overall, the reduction potential of UQ/Q falls between those of Complex I and Complex II in the electron transport chain, making it an important mediator of electron transfer between the two complexes.

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Cyclops are heterotrophic

Answer:

Explanation:

because

Neon and Krypton, both are belongs to Inert or Noble gas Group

The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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The reaction of the hydrogen and the chlorine atoms would lead to the formation of HCl

In this reaction, each chlorine molecule (Cl2) breaks apart into two chlorine atoms (Cl), and each hydrogen molecule (H2) breaks apart into two hydrogen atoms (H). These reactive atoms then combine to form hydrogen chloride molecules (HCl).

It's worth noting that the reaction between hydrogen gas and chlorine gas is highly exothermic and releases a significant amount of energy.

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10.6 atm is the pressure of 2 moles of carbon dioxide at 70 degrees Celsius contained in a 4000 mL container.

The physical force applied to an object is referred to as pressure. Per unit area, a perpendicular force is delivered over the surface of the objects. F/A (Force every unit area) is the fundamental formula for pressure. Pressure is measured in Pascals (Pa).

Absolute, atmospheric, differential, as well as gauge pressures are different types of pressure. 'Pressure' is the term used to describe the thrust (force) applied to a surface every unit area. The proportion of the force can the surface area (more than where the pressure is acting) is another way to describe it.

P×V = n×R×T    

P× 4000 = 2×0.821×330

P = 10.6 atm

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Democritus said matter can not be divided indefinitely, Aristotle said that matter was made of four elements while John Dalton proposed a modern atomic model based on experimentation. Rutherford said atoms are mostly empty space, Thompson brought about negative electrons in a positive framework.  Bohr said that electrons orbit the nucleus in “shells.

There are many atomic models that was proposed which includes:

Rutherford in his experiment shot alpha (α) particles at gold foil whereby most particles passed through.

Hence he concluded the following:

Some positive α-particles deflected or bounced back.

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The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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