Which two solutions would be the BEST choice for their experiment?

Solutions 1 and 3 because they are a strong acid and a strong base.

Solutions 1 and 4 because they are a strong acid and a weak acid.

Solutions 3 and 4 because they are a strong base and a weak acid.

Solutions 2 and 3 because they are a weak base and a strong base.

Answer:

you will find 3 in aluminium

hydrogen should be b 3

and oxygen is 9

This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

Mutation can be defined as the changes in genetic material that is a change in DNA this lead to change in gene segment. mutation includes various factors such as UV light or mistakes during DNA replication . mutation leads to genetic variation in species. Mutation which offers survival advantage are favored by natural selection.

Thus, This mutation most likely affect the squirrel population : if the trait is favorable , it will be passed on to offspring over many generations, resulting in a population of darker squirrels.

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Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation two carbons are fully oxidized to CO₂, while four carbons remain in acetyl groups.

Pyruvate is a compound containing 3 carbon molecules formed from the first stage of glycolysis. One glucose molecule is reduced to two pyruvate molecules in the cytosol of the cell. The pyruvate then enters the matrix of the mitochondria, where pyruvate oxidation takes place.

Pyruvate oxidation is the reaction that connects glycolysis to the citric acid cycle or the Kreb's cycle. In eukaryotic cells, it occurs in the matrix of the mitochondria, but in prokaryotic cells, it occurs in the cytoplasm.

First, a carboxyl group is removed from the pyruvate. This carboxyl group is reduced to carbon dioxide (CO₂). The two-carbon molecule from the pyruvate called an acetyl is then attached to an organic compound called Coenzyme A (CoA), forming acetyl-CoA. This acetyl-CoA is the end product of pyruvate oxidation and acts as fuel for the next stage of cellular respiration, the citric acid cycle.

Thus, at the end of pyruvate oxidation, two carbon atoms of the 6 carbons in the starting glucose molecule are oxidized to two molecules of CO₂, while the remaining four carbons are in acetyl-CoA.

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Answer:

53

Explanation:

Iron has atomic number of 26

so mass number is 26 + 27 = 53

Iron atoms contain 27 neutrons. It has a mass of 53.

Therefore,

Mass number= no. of proton + no. of neutrons

Atomic number= no. of proton = 26

Mass number = 26+27

= 53

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Melting ice is an example of an endothermic reaction because it absorbs heat.

When ice melt it convert into water , the phase transition from solid to liquid. In solid phase the particles are held together with strong force of attraction. when it changes to liquid , the intermolecular attraction between particles will become weak and this is due to energy is absorbed by the system. The changes takes place only when the ice absorbed heat from its surrounding. when the heat is absorbed during the reaction it is called as Endothermic reaction. while when heat is release during the reaction it is called as exothermic reaction.

Thus, The Melting ice is an example of an endothermic reaction because it absorbs heat.

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p+=12   n°=14  e- =10 , The species that is represented here is ;

Mg2+.

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Of the 6 carbons in a starting molecule of glucose, at the completion of pyruvate oxidation, two carbons are fully oxidized to CO2, while four carbons remain in acetyl groups.

This is further explained below.

Generally, The acetyl group is a functional group that is used in organic chemistry.

Its chemical formula is [tex]COCH_3,[/tex] and its structural formula is [tex]CCH_3.[/tex]Occasionally, the sign Ac will be used to symbolize it.

In the nomenclature used by the IUPAC, acetyl is referred to as ethanol, despite the fact that very few people actually use this name. A methyl group is found inside the acetyl group, and it is single-bonded to a carbonyl.

In conclusion, At the end of the pyruvate oxidation process, two of the six carbons that were present in the glucose molecule at the beginning are converted into carbon dioxide, while the other four carbons are still present as acetyl groups.

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The  statement one is incorrect because the elements in periodic table has some similarities between them they are not completely different from each other.

The difference in stability between the electron configurations of metals as atoms and as ions is what causes metals to be reactive. Since they are all metals, when they interact, positive ions are produced.

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Plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

Plasmas is defined as a type of substance in which numerous electrons freely roam around the nuclei of the atoms.

Plasma has been referred to as the fourth state of matter, alongside solid, liquid, and gas.

When one or more electrons are ripped from an atom, they form a plasma.

Thus, plasmas are less dense than solids or liquids and have no set shape or volume. Plasmas are made up of atoms with some or all of their electrons stripped away and positively charged nuclei, known as ions, roaming freely.

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The solution that is a buffer is a solution that is 0.100 M in HNO₂ and 0.100 M in NaNO₂  .

A weak acid and its conjugate base, or a weak base and its conjugate acid, must be combined to create a buffer solution. Only HNO2 (Weak Acid) and NaNO2 are included in the list as an acid and its conjugate base (Conjugate Base). Given that all concentrations are equivalent, the pH of this solution would be the same as the pKa of HNO2 (3,15).

Acids that don't entirely dissociate in solution are referred to as weak acids. In other words, any acid that is not a strong acid qualifies as a weak acid. The amount of dissociation determines how strong an acid is; the more dissociation, the stronger the acid.

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Each atom has a wide range of potential electron transitions. There is a distinct energy differential for each transition. An emission spectrum is made up of these transitions. Similar to how fingerprints are unique to individuals, these emission spectra are to each element.

What is  emission spectrum?

The electromagnetic radiation spectrum produced when an electron changes from a high energy state to a lower energy state is known as the emission spectrum of a chemical element or chemical compound. The energy difference between the two states is equal to the photon energy of the emitted photon.

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The entropy of mixing of nitrogen and oxygen gases of mole fractions of 0.78 and 0.22 respectively is -4.34 J  and the molar Gibbs energy of mixing is - 1295.7 J. Negative sign of Gibbs energy indicates that the reaction is spontaneous.

A spontaneous reaction is the one which occurs naturally  without any urge or external factor or force. Spontaneity of a reaction can be determined from the Gibbs energy of the reaction. If Gibbs energy is negative then, the reaction is spontaneous and if positive reaction will be non- spontaneous.

Entropy of mixing is calculated using the mole fractions of the two gases Xa and Xb as written as follows:

ΔSmix =  R (Xa in Xa + Xb in Xb).

Where R is the universal gas constant equal to 8.314 J/(K mol)

We have the mole fraction of nitrogen and oxygen in the reaction. Apply these values to the equation as follows:

ΔSmix  = 8.314 (0.78 ln 0.78 + 0.22 ln 0.22)

            = -4.34 J

Molar gibbs energy of mixing  =  RT (Xa in Xa + Xb in Xb).

Thus ΔGmix = TΔSmix

                     = 298 K × -4.34 J

                     = -1295.7 J.

Therefore, the reaction of mixing of nitrogen and oxygen is spontaneous.

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Explanation:

To find the ionic charge of an element you'll need to consult your Periodic Table. On the Periodic Table metals (found on the left of the table) will be positive. Non-metals (found on the right) will be negative.

KE=1/2 mV^2

m=mass

V=velocity

Phenol has a molar mass of 94.11 g/mol.It is an active ingredient in many oral anesthetics that is used in sore throat sprays.

To calculate molar mass the following steps must be followed:

1) Divide the molar mass of phenol by the molar mass of carbon. This will give you the number of moles of carbon in phenol.

2) Add the number of moles of carbon to the number of moles of hydrogen. This will give you the total number of moles in phenol.

3) Multiply the total number of moles by the molar mass of carbon.

This will give you the molar mass of phenol.

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Answer: As a solution is diluted, the absorbance of the solution is decreased

Explanation: As a solution is diluted, the absorbance of the solution is decreased. The concept of dilution relates molar concentration and volume.M1V1=M2V2. If a 1.0 liter of a 1.0 molar solution is diluted to 2.0 molar solution, the new molar concentration is 0.50. The new concentration has been reduced by one half as the volume was doubled.Beer's law relates the concept of concentration and absorbance. According to this law, absorbance and concentration are directly proportional. If you increase the original concentration, the absorbance increases and if you dilute the solution(which means you decrease the original concentration), the absorbance will decrease in direct proportion. ;)

According to the Beer's law the absorbance of solution is directly proportional to concentration,hence on dilution  the concentration decreases which decreases absorbance on a whole.

The Beer's law states that  the absorbance is directly proportional to the concentration of a solution that is,A∝C .Most substances follow Beer's law  from low to moderate temperature ranges only.It is not followed well in case of saturation effects  which are present in highly concentrated samples.

Due to the direct relation between absorbance and concentration , absorbance is preferred over transmittance for recording the spectra.

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Adding deionized water into a solution containing ions will affect the electrical conductivity of the solution because the ions in the solution will be attracted to the water molecules.

Deionized water is water that has had its ions removed. This means that it will not conduct electricity.It will cause the ions to be more spread out in the solution, which will decrease the electrical conductivity of the solution. When deionized water is added to a solution containing ions, the electrical conductivity of the solution will be reduced. The reason for this is that the ions in the solution will be attracted to the water molecules, and this will reduce the number of ions that are available to conduct electricity.

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The pH of the solution is 7.94 if the concentration of the tris acid is 0.200m and the concentration of the conjugate base is 0.150m.

The pH of this buffer can be calculated using the Henderson-Hasselbalch equation according to which the pH is equal to the sum of the pKa value and the log of the concentration of conjugate base divided by the concentration of the weak acid.

This equation can be represented as;

pH = pKa + log ([conjugate base] ÷ [weak acid])

Substituting the given values into this equation to find the pH;

pH = 8.06 + log([0.150] ÷ [0.200])

pH = 8.06 + log(0.75)

pH = 8.06 + (-0.125)

pH = 7.94

Therefore the pH of this solution is calculated to be 7.94.

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Based on the optical rotation equation, the specific rotation of the compound is -27.73 °C*mL/g*dm,

The optical rotation equation looks like this:

α = [α] * c * l

α - measured optical rotation (-2.67°)
[α] - specific rotation of the compound, temperature, and wavelength used, usually in °C, although more accurately in °C*mL/g*dm

c - concentration of the compound in g/mL (9.63 g / 200 mL = 0.04815 g/mL)

l - length of the polarimeter cell in dm (20.0 cm = 2.00 dm)

If we transform the equation we get:

[α] = α / (c * l) = -2.67° / (0.04815 g/mL * 2.00 dm) = -27.73 °C*mL/g*dm

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Answer:

Lithium is the most reactive out of them.

Explanation:

For this question, we will be looking at the valence electrons each one has. Valence electrons are the electrons that are on the outermost electron shell (the outer circle around each of them).

Lithium has 2 electron shells: the innermost has 2 electrons (this circle can only hold up to 2 electrons), and the outermost circle has 1 electron (this circle can hold up to 8 electrons).

Helium has only 1 electron shell and within it, it has 2 electrons (remember this is the maximum amount this circle can take).

Argon has 3 electron shells: the innermost has 2 electrons (the maximum this circle can have), the middle one has 8 electrons (the maximum this circle can have), and the outermost circle has 8 electrons around it (this circle also holds a maximum of 8 electrons).

Now let's look at the electrons present only on the outer shell of each of them (these are called valence electrons).

Lithium has only 1 electron on its outermost shell but this shell can have up to 8 electrons.

Helium has 2 electrons, the maximum amount that circle can have.

Argon has 8 electrons, the maximum that circle can have.

-Every atom has the goal of wanting to be stable, by completing the maximum amount on their outermost shell by either gaining or losing electrons.

Since Helium and Argon already have the maximum amount of electrons their outermost circle can have, they are already stable and neither want to gain or lose electrons.

Lithium is our only option that has an incomplete outermost electron shell with only 1 out of the 8 electrons it can have.

It is easier for Lithium to give away that 1 electron it has and then have a complete inner-circle after giving out that 1 electron (it would then look like Helium), than to gain 7 electrons and complete the circle.

This is why Lithium is very reactive, because it is constantly looking to find someone to give away their electron to and become stable. Lithium also has a charge of (+1), which means that it gives away one of its electrons.

In the given examples ice cream melts in a bowl is an example of a physical change.

A physical change occurs when a substance transforms from one state to another i.e., the change only affects its physical properties like color, volume, shape, and phase changes.

Using water as an example, if we have it at room temperature, it is a clear liquid. If we decrease the temperature below the freezing point, the water freezes and forms ice. If we increase the temperature above the boiling point, the water turns into a gas(steam). We can see that in all three forms, the water is still composed of two hydrogen atoms and one oxygen atom. Nothing is added or subtracted from it, which means the chemical composition stays the same. The transformation of water from liquid to solid or gas is an example of a physical change.

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In a parallel circuit with identical light bulbs, the statement D is true. D Adding more identical light bulbs will not change their brightness.

A parallel circuit has two or more paths for modern to waft through. Voltage is equal across everything of the parallel circuit. The sum of the currents thru each route is equal to the entire modern that flows from the supply.

A parallel circuit has one feature: to preserve the power flowing while one pathway is interrupted. A top instance is mild furnishings that use more than one mild bulb. when an unmarried bulb within the fixture goes the light fixture maintains to operate.

In a chain circuit, the modern-day thru every one of the additives is the same, and the voltage across the circuit is the sum of the voltages throughout every issue. In a parallel circuit, the voltage across every one of the components is equal, and the total cutting edge is the sum of the currents via each element.

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The element tellurium forms an ion with the charge of +4.

The symbol for this ion is Te⁴⁺ and the name is tellurium ion.

The number of electrons in this ion is 48 electrons.

Ions are substances that are formed when atoms of elements gain or lose electrons.

There are two types of ions based on the charge the ions carry:

Metallic atoms form cations by losing one or more electrons.

Non-metallic atoms form negative ions by gaining one or more electrons.

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ANSWER

STEP-BY-STEP EXPLANATION

Omar is facing a problem with money.

Businesses typically use earnings and revenue to describe their financial performance over a period of time. Profit and turnover are the two most valuable numbers in a company's financial statements.

Revenue is the total money a company earns from the sale of goods and services. Income is called the top line because it is at the top of the company's income statement, which also refers to the company's gross sales. Income is the income received before expenses are deducted. Turnover is also called turnover in some companies, because turnover includes potential returns from customers.

Profit, on the other hand, reflects the bottom line of the income statement and is the profit the company earned during the period. The profit indicator is entered in the net result of the profit and loss statement. When investors and analysts talk about a company's performance, they are talking about the company's net income or earnings.

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Answer:

wow I can't believe you. your cheating I'm giving you a f on this. unless you tell me in front of the class that you cheated. I'm joking man but seriously I don't know

Answer: Gains an extra electron in 2p orbitals it's option Y (1s²,2s², 2p⁶

For the original solution,

Concentration = 85g/L = 85g/1000ml

Required Volume = 150ml

(a)

Concentration = Mass/Volume

⇒ 85g/1000ml = Mass of the solute/150ml

⇒ Mass of the solute = 85 x 150/1000

⇒ Mass of the solute = 12.75 grams

Hence, 12.75 grams of the solute is required to prepare the original solution.

(b)

Now,

Concentration of the original solution = 85g/L = M1

Required concentration = 50g/L = M2

Final Volume = 500 ml = V2

Required Volume from the original solution = V1 =?

As we know,

M1V1 = M2V2

Hence,

85g/L x V1 = 500 ml x 50g/L

⇒ V1 = 500 X 50 / 85

⇒ V1 = 294.11 ml

Therefore, 294.11 ml of the original solution is required to make the diluted solution.

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Answer:

Explanation:

The only option that would have 6 moles is 67.2 L