____ are not used in gluconeogenesis because they are only metabolized to acetyl-CoA

The number of water molecules in the container when one electron is removed from every hundredth water molecule and placed in a container is 100. m from the water is 3.30 x 1025.

Given,1 liter of water = 1000 g of water1 mole of water molecules = 6.022 x 1023 particles.

Therefore, 55.5 moles of water molecules = 55.5 x 6.022 x 1023 particles = 3.33 x 1025 particles one electron is removed from every hundredth water molecule.

So, 1 electron is removed from 1% of water molecules. Therefore, the number of water molecules from which the electron is removed = (1/100) x 3.33 x 1025 = 3.33 x 1023 molecules.

Now, this electron is placed 100 m away from the water container. The distance between the water container and the electron is not relevant for finding the number of water molecules in the container, hence can be ignored.

So, the number of water molecules in the container = Total number of water molecules - number of water molecules from which electron is removed= 3.33 x 1025 - 3.33 x 1023 = 3.30 x 1025.

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An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.

Brittleness is the characteristic of a substance to break easily when hit with an object or against an object.

The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.

Sulfur exists naturally as a brittle solid that is yellow in appearance.

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Metals have a crystalline in nature, and a consistent shift in stress causes the structure to alter, causing the metal to stiffen and fracture. This is known as metal fatige. The bending causes that to occur.

A metal is a substance that has a shiny look when freshly processed, polished, or shattered, and conducts electricity and heat rather effectively. Generally speaking, metals are malleable and ductile.

These characteristics are the outcome of the metallic link that exists between the metal's atoms or molecules.

The earth's crust is where most pure metals are found. They are discovered in ores, which are solid materials from which metals and minerals may be extracted. The majority of the planet's iron mass, which makes up over a third of its mass, is located in its core.

Thus, Metals have a crystalline in nature, and a consistent shift in stress causes the structure to alter.

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Answer: B. No, fluorine is always assigned an oxidation number of -1.

Explanation:

Answer:

The number following the name of the element is the number of subatomic particles inside the nucleus of the atom. This means that it is the mass number of the isotope. The average atomic mass of the element is the sum of the products of the percentage abundance and mass number of the naturally occurring isotopes.

Since, the average atomic mass of the hydrogen is nearest to 1 then, the most abundant isotope should be hydrogen-1.

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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The reaction of benzaldehyde with acetone and sodium hydroxide produces dibenzylideneacetone. This is an example of a condensation reaction, specifically a crossed aldol condensation.

In this reaction, benzaldehyde and acetone undergo a nucleophilic addition reaction with the strong base sodium hydroxide. The sodium hydroxide deprotonates the alpha-carbon of the carbonyl group in both benzaldehyde and acetone, creating nucleophilic enolate intermediates. The enolate of acetone then attacks the carbonyl group of benzaldehyde, forming an intermediate that subsequently loses a water molecule, leading to the formation of dibenzylideneacetone.

Dibenzylideneacetone is a yellow solid and is used as a UV absorber, as a flavoring agent, and in the preparation of fragrances. The crossed aldol condensation reaction is an important synthetic route to form α,β-unsaturated carbonyl compounds, which have numerous applications in organic chemistry.

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Answer:

https://clever.com/

Explanation:

The amplitude of a seismic wave usually decreases as the wave moves away from the epicenter due to the phenomenon of wave attenuation.

There are several factors that contribute to this attenuation:

Geometric Spreading: As the seismic wave propagates outward from the earthquake's epicenter, it spreads out over a larger area, resulting in the energy being distributed over a larger volume. This causes the amplitude of the wave to decrease with distance. According to the inverse square law, the intensity of the wave decreases with the square of the distance from the source. Absorption and Scattering: The seismic wave encounters various materials and geological structures as it travels through the Earth. These materials can absorb and scatter the energy of the wave, causing a reduction in its amplitude. Different types of rocks and soil have varying levels of attenuation, leading to differences in the decrease of wave amplitude.

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Answer:

ʏᴇs, ɪ ᴛʜɪɴᴋ

Explanation:

TᕼᗩᑎKՏ ᒪOᗪՏ

Answer:

(b) that is hydrophobic

Explanation:

e.g, alanine

Cause, Alanine possess hydrophobic side chain and the most appropriate answer is (d) part......

Alanine is an aliphatic amino acid, because the side-chain connected to the α-carbon atom is a methyl group (-CH3), alanine is the simplest α-amino acid after glycine. The methyl side-chain of alanine is non-reactive and is therefore hardly ever directly involved in protein function..

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Answer:

(b) that is hydrophobic

Explanation:

e.g, alanine

Cause, Alanine possess hydrophobic side chain and the most appropriate answer is (d) part......

Alanine is an aliphatic amino acid, because the side-chain connected to the a-carbon atom is a methyl group (-CH3), alanine is the simplest a-amino acid after glycine. The methyl side-chain of alanine is non-reactive and is therefore hardly ever directly involved in protein function...

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Answer:

The chemistry of iron is dominated by the +2 and +3 oxidation states i.e. iron(II) and iron(III) complexes e.g. Fe2+ and Fe3+ complex ions with selected ligands, usually of an octahedral shape, a few tetrahedral iron(III) complexes are mentioned too. The reactions of the aqueous ions iron(II) and iron(III) with ammonia, sodium hydroxide and sodium carbonate are described and explained as are complexes of iron(III) with the chloride ion and cyanide ion.

principal oxidation states of iron, redox reactions of iron, ligand substitution displacement reactions of iron, balanced equations of iron chemistry, formula of iron complex ions, shapes colours of iron complexes, formula of compoundsExplanation:

Answer:

molarity 0.1

Explanation:

mass of copper nitrate =2.4

no of moles exist in 120ml= 2.4/187.5=0.0128mole

molarity =.0.0128/.12=0.1m

The model that should show the corresct representation of xenon gas is one in which the gas molecules  are isolated and monoatomic.

A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.

The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.

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Answer:

the same is what is this question like what did u exame

Hair with the follicle (option A)  is considered individual evidence.

Individual evidence is a type of physical evidence that can be linked to a specific individual or source with a high degree of certainty. This can include items such as DNA samples, fingerprints, hair and fiber samples, shoe prints, tool marks, and other unique physical characteristics or patterns.

Individual evidence is often used in criminal investigations and trials to establish a direct connection between a suspect or perpetrator and a crime scene or victim.

Because individual evidence is typically unique to a particular person or object, it can be a powerful tool for identifying and prosecuting criminals, but it must be collected, analyzed, and presented in a careful and scientifically rigorous manner to be admissible as evidence in court.

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The Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.

As given in the problem we have to find out how much PE would a 100 kg man have on a sled at the top of the hill.

The potential energy of the man = 100 × 9.8 × H

                                                      = 980H

Both mass and acceleration due to the gravity of the earth are constant and the only variable is the height of the inclined surface.

Thus, a ball rolling down an incline has its maximum potential energy at the top, therefore the correct answer is option D.

Thus, the Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.

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The diagram shows the arrangement of the outer electrons only in a molecule of ethanoic acid.

a) The different elements found in this compound is Carbon, Hydrogen and oxygen.

b)  The total number of atoms present in this molecule is 8.

c) Between which two atoms is there a double covalent bond is in the  between of one carbon atom and oxygen atom.

d)  number of the covalent bonds does each carbon atom make is 7.

e) this compound to be a liquid at room temperature

Thus, The diagram shows the arrangement of the outer electrons only in a molecule of ethanoic acid.

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LiBr being 7.99% lithium and 92.01% bromine by mass regardless of its origin is an example of a constant composition compound.

Constant composition compounds, also known as pure substances or chemical compounds, have a fixed and consistent ratio of elements by mass. This means that regardless of the source or method of production, the compound will always have the same proportion of elements. In the case of LiBr, it will always contain 7.99% lithium and 92.01% bromine by mass, regardless of where it is obtained.

This constant composition is a result of the chemical bonding between lithium and bromine atoms in LiBr. The atoms combine in a specific ratio to form a stable compound with distinct properties. The Law of Definite Proportions states that elements in a compound are always present in fixed and predictable ratios, providing a foundation for understanding constant composition compounds.

This characteristic is crucial in various fields, including chemistry, where it allows scientists to accurately predict the behavior and properties of substances. It ensures consistency in experiments, manufacturing processes, and quality control.

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Yes the above given reaction is a decomposition reaction.

A decomposition reaction can be defined as the chemical reaction in which one reactant breaks down into two or more products. The general format of a decomposition reaction is provided below.

AB -> A + B ; Where AB is the parent molecule (reactant) and A & B are the product molecules.

Disproportionation reaction, also sometimes called dismutation reaction, is basically a type of redox reaction involving simultaneous reduction and oxidation of atoms of the same element from one oxidation state (OS) to two different oxidation states.

NH4NO3 undergoes redox reaction to form N2O and Water

\(NH_{4}NO_{3}\)  → \(N_{2}O\) + \(2H_{2}O\)

In this reaction, two nitrogen atoms in the reactant are present in different oxidation states. Hence, it is not a disproportionation reaction and is a decomposition reaction

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Answer:

Al3+

Explanation:

Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal

Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.

Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.

The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.

Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]

When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.

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Your question is incomplete. But your complete question probably was :

Which element below would have a 3+ charge as an ion?

answer choices.

nitrogen (N).

boron (B).

silicon (Si).

argon (Ar)

One of the method which is used to represent the concentration of a solution is the molarity. Here the molarity of a solution that contains 5.63 moles of lithium nitrate in 3.25 liters of solution is 1.732 mol/L.

The ratio of number of moles of the solute present per liter of the solution is defined as the molarity. The equation which is used to calculate the molarity of a solution is:

M = n₂/ V

Here n₂ is the number of moles of the solute and 'V' is the volume of the solution in liters.

There are different methods of expressing the concentration of a solution. Molality, Normality, etc. are some examples.

The molarity of a solution that contains 5.63 moles of lithium nitrate in 3.25 liters of solution is obtained as:

M = 5.63 mol/ 3.25 L = 1.732 mol/L

Thus the molarity is 1.732 mol/L.

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Answer:

6

Explanation:

Answer:

After 7.648 days, you will see one quarter.

Explanation:

1 → 0.5 → 0.25

Since half life of radon-222 is 3.824 days, you need twice this time to get one quarter at the end.

2 ⋅ 3.824 = 7.648 days.

We are aware that more charged particles should be present in the most concentrated solutions (for KCl, K+, and Cl-). The increased solute concentration draws the water in via osmosis.

As a result, the water level is lowest on the right side of the U-tube (C and D). However, the left side tube (A, B) has a more concentrated solution as compared to the right side tubes (C, D).

The result is that the tube B solution is the highest concentrated.

Describe osmosis.

Osmosis is the naturally occurring net movement of solvent molecules through a selectively permeable membrane in a direction that tends to balance the solute concentrations on the two sides, from a region of high water potential (region of lower solute concentration) to a region of higher water potential.

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We are aware that more charged particles should be present in the most concentrated solutions (for KCl, K+, and Cl-). The increased solute concentration draws the water in via osmosis.

As a result, the water level is lowest on the right side of the U-tube (C and D). However, the left side tube (A, B) has a more concentrated solution as compared to the right side tubes (C, D).

The result is that the tube B solution is the highest concentrated.

Describe osmosis.

Osmosis is the naturally occurring net movement of solvent molecules through a selectively permeable membrane in a direction that tends to balance the solute concentrations on the two sides, from a region of high water potential (region of lower solute concentration) to a region of higher water potential.

Answer:

Energy is the ability to do work, or in more simple terms: energy makes things happen. You use energy to ride your bike, play video games, bake cookies, and drive to school. Energy is exciting! Energy can be transferred from one object to another, and energy can be transferred into different forms, such as light, sound, and heat. When you sit by a campfire, you can feel the heat warm your body. The heat from the burning wood is transferred to your marshmallow, causing it to get soft and gooey. Perfect for your s’mores!

Heat can move from warm objects to cool objects, just like in the video when the heat from the wires made the paper ignite.

Explanation:

Answer:

a )Li

b)O

c)F

Explanation:

a) Li-1s^2 2s^1

F-1s^2 2s^2 2p^5

it is easy to pull out e- from 2p orbit than 2s because 2s orbit is close to nucleus.Therefore Li have high ionisation enthalpy

b)oxygen ion is larger than Na because o have fewer proton

c)F because it requires only 1e to achieve stable noble gas configuration.Therefore to achieve stable nobke gas electonic configuration it accept 1e.

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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Explanation:

The number of electrons, in turn, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element

Answer:

Question 1: (A)

The number of electrons determine the chemical properties of an atom.

Question 2:  (C)

Test tube cannot measure the volume of liquids rather they are used in chemical reactions

Question 3: (D)

Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers.