Which of the following is most likely NOT a chemical reaction?


(A)
A white powder and a clear liquid mix and the beaker holding the mixture gets cool to the touch

(B)
A white solid and a clear liquid mix and produce a bright orange, bubbling substance

(C)
A pan containing a clear liquid is place on a hot stove and begins to bubble after a few minutes.

(D)
A blue liquid and a green solid mix and produce a purple paste

The element selenium (Se) with atomic number 34 possesses four p electrons.

Explanation:

In the periodic table, the p-block elements are located in groups 13 to 18, and they have valence electrons in the p orbital. The p orbital can hold a maximum of six electrons, distributed among three suborbital (px, py, and pz) with a maximum of two electrons in each.

Selenium is located in Group 16, also known as Group 6A, which means it has six valence electrons. To determine the number of p electrons, we subtract the number of core electrons (filled energy levels) from the total number of valence electrons. In the case of selenium, the core electron configuration is [Ar] 3d10 4s2 4p4, indicating that it has 28 core electrons.

Subtracting this from the total valence electrons (6), we find that selenium has four p electrons.

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The algae bead could carry out photosynthesis more in the presence of light, which caused the CO2 indicator to become more alkaline.

Describe alkaline.

The meaning of alkaline is: having the characteristics of the an alkali or alkaline metal; being an alkali; or being related to one: a solution that is basic, in particular, and has a pH greater than 7 having the characteristics of a hydroxide or liquid metal; being an alkali; or being related to one: a solution that is particularly basic: whose pH is greater than 7

What characteristics do alkalis have?

Alkali properties. Because fatty acids in skin are saponified, alkaline bases have a slimy or sticky feel to the touch. Alkalis are all Arrhenius bases because they dissolve in water to produce hydroxide ions (OH-). Some alkalis, like barium carbonate, are typically water-soluble.

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Answer:

the sun is pretty smol compared to others

Explanation:

The consumption function based on the information in Table 5 is as follows: C = 2577 + 0.75Y. It is given, Consumption function, C = Ca + cY Where, Ca is autonomous consumption expenditure, c is marginal propensity to consume (MPC)Y is disposable income

The consumption function based on the information in Table 5 is: Table 5Income(¥ billions)

Consumption(¥ billions)100025020007526000102772750120301.

Write the consumption function in the given format. Ca = Autonomous consumption expenditure c = MPCY = Disposable Income Calculation:

We can obtain the value of Ca as follows: C = Ca + cY

Put the given values, C = 2577Ca + 0.75YAt Y = 1000 billion, C = 2577(1) + 0.75(1000)

= 8327 billion

At Y = 2000 billion, C = 2577(1) + 0.75(2000)

= 13277 billion

At Y = 3000 billion, C = 2577(1) + 0.75(3000)

= 18277 billion

At Y = 4000 billion, C = 2577(1) + 0.75(4000)

= 23277 billion

At Y = 5000 billion, C = 2577(1) + 0.75(5000)

= 28277 billion

Therefore, the consumption function based on the information in Table 5 is as follows: C = 2577 + 0.75Y.

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Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

Answer:

Explanation:  encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.

The reaction that occurs at the anode in the galvanic cell represented by Cu | Cu²⁺ || Ag⁺ | Ag is option A) Cu(s) → Cu²⁺(aq) + 2e⁻.

In a galvanic cell, the anode is the electrode where oxidation occurs. It is the site of electron loss and is negatively charged. In the given shorthand representation, the anode is represented on the left side with the symbol "Cu" indicating a copper electrode.

The anode reaction involves the conversion of the solid copper (Cu) electrode to copper ions (Cu²⁺) in the solution by losing two electrons (2e⁻). The reaction is represented as Cu(s) → Cu²⁺(aq) + 2e⁻, which is option A.

On the other hand, at the cathode, reduction occurs, which is the gain of electrons and is positively charged. In the given shorthand representation, the cathode is represented on the right side with the symbol "Ag" indicating a silver electrode.

Therefore, in the given galvanic cell, the reaction at the anode is the oxidation of copper, as stated in option A) Cu(s) → Cu²⁺(aq) + 2e⁻.

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What were Lamarck's ideas about evolution and Why were those ideas incorrect?

→ These and other examples show that Lamarck's theory does not explain how life formed and became the way it is. The other way that Lamarck's theory has been proven wrong is the study of genetics. Darwin knew that traits are passed on, but he never understood how they are passed on.

Knowing the percent iron in a mixture is essential for building a bridge because it directly affects the structural integrity, strength, and durability of the bridge.

Iron is a critical component in steel, which is commonly used in bridge construction. The percent iron in a mixture determines the strength and other mechanical properties of the steel. By knowing the percentage of iron, engineers can ensure that the steel used in the bridge meets the required standards for strength and durability. This knowledge helps in preventing potential structural failures and ensuring the safety of those using the bridge.

In summary, determining the percent iron in a mixture is crucial for building a safe and reliable bridge, as it plays a significant role in the bridge's structural integrity, strength, and durability.

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To make a 5.00 M solution using 210.0 grams, g, of sodium chloride, NaCl, we will use the formula of volume of solution in liters is equal to mole of solute per molarity of solution, which is 0.718 L.

Molarity (M) refers to the amount of a substance in a specific volume of solution. It is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.

Molarity  is given by the quotient,

Molarity = moles of solute/volume of solution in liters.

Now in order to get the molarity of the solution, we have to divide the moles of solute over the liters of solution. Since we are given the mass of the solute, we must first convert the mass of NaCl into moles with the help of the molar mass of NaCl as a conversion factor.

210 NaCl x ( 1 mol NaCl/ 58.44g NaCl) = 3.59 mol NaCl.

We already have the molarity of the solution that is 5.00 M. So the solution to find out the volume will be,

Volume of solution in liters = mole of solute/ molarity of solution,

That is 3.59 mol NaCl / 5M = 0.718 L

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All of the glassware do not measure with the same degree of accuracy.

A glassware is an apparatus that could be used for measurement. Most of the glassware are used for the measurement of fluids. In this case, we can see that the kinds of glass ware that could be used for measurement in the laboratory are; Burette, pipette, measuring cylinder etc.

The calibration of all the glassware are not the same, recall that there must always be a measure of uncertainty that goes with the instrument that is used in measurement.

Having known this, we can see that all of the glassware do not measure with the same degree of accuracy.

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Answer:

Increases by 100 Pa

Explanation:

According to The Ideal Gas Equation,

The alkaline earth metals are highly reactive and do not exist free in nature.

The alkaline earth metals are the metals that are found in group two of the periodic table. They are the elements that have two electrons on their outermost shell. They are highly electropositive and as such, they do not exists as being free in nature.

We can see that the outermost electron configuration of the alkali earth metals is obtained as ns^2. This shows the fact that they are divalent and they also form divalent positive ions.

The alkaline earth metals only form ionic compounds in which they exists as the cation in the compound.

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Answer:

Brainliest Please !!!!!

Nuclear magnetic resonance spectroscopy (NMR) is used to study the electronic environment of atoms and the bonding nature of a compound.

The number of different signals observed in the 1H NMR spectra of the given compounds are as follows: Compound A: 10 signals, Compound B: 6 signals ,Compound C: 4 signals Compound D: 6 signals ,Compound E: 9 signals, Compound F: 3 signals

In proton nuclear magnetic resonance spectroscopy (1H NMR), the magnetic field strength and electronic environment of the protons influence the chemical shifts. The shielding effect or deshielding effect of the nearby atoms, bond length, and bond angle, among other factors, all influence the chemical shifts. There are five different types of proton environments, which correspond to five different chemical shifts, in this case: Type 1: Hydrogen atoms that are covalently bonded to sp3 hybridized carbons. Type 2: Hydrogen atoms that are covalently bonded to sp2 hybridized carbons. Type 3: Hydrogen atoms that are covalently bonded to sp hybridized carbons. Type 4: Hydrogen atoms that are covalently bonded to aromatic carbons. Type 5: Hydrogen atoms that are directly bonded to electronegative elements such as nitrogen, oxygen, or halogens.

Here, to determine the number of signals expected in the 1H NMR of the compounds. Compound A: 10 different proton environments => 10 signals. Compound B: 6 different proton environments => 6 signals. Compound C: 4 different proton environments => 4 signals. Compound D: 6 different proton environments => 6 signals. Compound E: 9 different proton environments => 9 signals. Compound F: 3 different proton environments => 3 signals.

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Answer:

9.92

Explanation:

Since we are given the concetration of H+ we can find the ph by taking the negative log and then subtracting the ph from 14 to give us pOH

-log(8.26e-5) = pH= 4.08

pOH= 14-4.08

pOH= 9.92

Answer:B

Explanation:

The summary which expresses the main points of the Gravitational force best is the second one.

Gravitational force is a attraction force which is present between two objects and represented as:

F = gm₁m₂ / r², where

g = gravitational constant

m₁ = mass of one object

m₂ = mass of another object

r = distance between two objects

Because of gravity all objects will have a accurate position and particular order.

Hence second paragraph expresses best.

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The concentration of the vial is 0.5 %. We will suppose that it is % w/v. The concentrarion % w/v is defined as:

% w/v = mass of solute in g/volume of solution in mL * 100

We have to find the mL that we have to administer to deliver 20 mg. Let's convert those mg into g. We know that there are 1000 mg in 1 g.

1000 mg = 1 g

mass of solute in g = 20 mg * 1 g/(1000 mg)

mass of solute in g = 0.020 g

Now that we know the concentration of the solution and the mass in grams of the medication, we can find the volume in mL.

% w/v = mass of solute in g/volume of solution in mL * 100

0.5 = 0.020 / volume of solution in mL * 100

volume of solution in mL = 0.5/(100 * 0.020)

volume of solution in mL = 0.25 mL

Answer: we need to administer 0.25 ml

The pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] represents the concentration of hydrogen ions in the solution.

For a strong acid like sulfuric acid (H2SO4), it is completely dissociated in water, meaning all of its molecules will release their hydrogen ions (H+) into the solution. Therefore, the concentration of hydrogen ions in the solution will be equal to the concentration of sulfuric acid.

In this case, the concentration of sulfuric acid is 2.45 x 10^-3 M. Therefore, the concentration of hydrogen ions is also 2.45 x 10^-3 M.

Now we can calculate the pH using the above formula:

pH = -log[H+]

= -log(2.45 x 10^-3)

= 2.61

Therefore, the pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

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The major air pollutant sulfur oxide is removed from the flue gas by limestone, which is mixed with coal during the fluidized bed combustion process.

In fluidized-bed combustion of coal, limestone is mixed with coal to remove the major air pollutant sulfur oxides.

What is fluidized bed combustion?

Fluidized bed combustion (FBC) is a process that burns solid fuel in the presence of a fluidized air stream. This combustion method is similar to circulating fluidized bed combustion (CFBC).

A bed of solid particles is maintained in a state of suspension and turbulence by an upward velocity of the fluid, typically air or an air and fuel mixture. Coal, biomass, and waste products are the most common fuels used in fluidized bed combustion.

What is the purpose of limestone in fluidized bed combustion?

The flue gas from fluidized bed combustion contains major air pollutants such as sulfur oxides (SOx), nitrogen oxides (NOx), and carbon dioxide (CO2). The use of limestone, a calcium-rich mineral, in fluidized bed combustion technology aids in the removal of sulfur oxides (SOx).

Limestone is used as a reagent, which reacts with the sulfur in the coal to form calcium sulfate. It is then captured and eliminated as a solid by the combustion process.

Therefore, the major air pollutant sulfur oxide is removed from the flue gas by limestone, which is mixed with coal during the fluidized bed combustion process.

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Answer:

(A) Blood

Explanation:

Answer:

3966.82 J

Explanation:

q=sm∆T

q=73×13×4.18

the specific heat for water is 4.18

Answer:

\(\boxed {\boxed {\sf 39,668.2 \ Joules}}\)

Explanation:

We are given the mass and change in temperature, so we must use this formula for heat energy:

\(q=mc \Delta T\)

The mass is 73 grams. Water's specific heat is 4.18 J/g × °C. Let's calculate the change in temperature

Now we know all the variables and can substitute them into the formula.

\(m= 73 \ g \\c= 4.18 \ J/g* \textdegree C \\\Delta T= 13 \ \textdegree C\)

\(q= (73 \ g )(4.18 \ J/g*\textdegree C)(13 \textdegree C)\)

Multiply the first numbers together. The grams will cancel.

\(q= 3051.4 \ J/\textdegree C (13 \textdegree C)\)

Multiply again. This time, the degrees Celsius cancel.

\(q= 39668.2 \ J\)

39,668.2 Joules of heat energy are absorbed.

Answer:

A D F

Explanation:

Its right but its not in order But its A D and F

Answer:

answer in picture

Explanation:

Acidity of a compound is defined by its ability to donate a proton to the solution, in other words, by its acidity constant or pKa value. The smaller the value of pKa, the stronger the acid. Therefore, to decide which one of the given acids is most acidic, we need to compare their pKa values.

Both 3-nitrobenzoic acid and 4-nitrobenzoic acid are derivatives of benzoic acid and differ in the position of the nitro (NO2) group, which is substituted in the 3rd and 4th positions of the aromatic ring respectively. The presence of nitro group increases the acidity of the benzoic acid, making both the nitrobenzoic acids more acidic than the parent benzoic acid.In general, electron-withdrawing substituents such as nitro groups increase the acidity of the compound because they destabilize the conjugate base by withdrawing electron density from the anionic oxygen.

The greater the electron-withdrawing effect, the lower the pKa value of the acid.  The nitro group has a stronger electron-withdrawing effect in the ortho and para positions than in the meta position. Hence, 4-nitrobenzoic acid is more acidic than 3-nitrobenzoic acid. Therefore, the most acidic compound among the two given compounds is 4-nitrobenzoic acid.

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E - B - D - A - F - C is the proper order for fatty acid synthesis. The process begins with the formation of malonyl ACP (E), followed by condensation (B) and reduction of a carbonyl (D). Dehydration (A) occurs next, followed by reduction of a double bond (F). Finally, the C16 fatty acid is released (C).

The sequence E - B - D - A - F - C represents the six steps involved in the synthesis of fatty acids. The first step involves the formation of malonyl ACP, which is catalyzed by acetyl-CoA carboxylase. The second step is the condensation of malonyl ACP with acetyl-CoA by the action of fatty acid synthase. The third step involves the reduction of the carbonyl group formed by the condensation reaction by the action of 3-ketoacyl-ACP reductase. The fourth step is the dehydration of the hydroxyl group of the β-ketoacyl-ACP intermediate by the action of 3-hydroxyacyl-ACP dehydrase. The fifth step involves the reduction of the double bond formed by dehydration by the action of enoyl-ACP reductase. The final step is the release of the C16 fatty acid from the enzyme complex by the action of thioesterase.

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The correct order of fatty acid synthesis is E - B - D - A - F - C:
E. Formation of malonyl ACP
B. Condensation
D. Reduction of a carbonyl
A. Dehydration
F. Reduction of a double bond
C. Release of a C16 fatty acid

The first step in the fatty acid synthesis is the formation of malonyl ACP (E), followed by the condensation of malonyl ACP with acetyl CoA (B) to form a four-carbon compound. This four-carbon compound then undergoes reduction of the carbonyl (D) and dehydration (A) to form a double bond. This double bond is then reduced (F) to form a saturated fatty acid. The final step is the release of the newly synthesized C16 fatty acid (C).

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The structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol) is 3-chloro-1-hexene.

When one mol of 1-hexyne reacts with chlorine, the major organic product isolated from the reaction is 3-chloro-1-hexene.

Structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol):Explanation:1-hexyne is an alkyne containing six carbon atoms and a triple bond between the first and second carbon atoms. When it reacts with chlorine, the triple bond breaks, and a chlorine atom is added to one of the carbons.

This results in the formation of several products.3-chloro-1-hexene is the major organic product that is obtained from this reaction. It is an alkene that contains six carbon atoms, with a chlorine atom attached to the third carbon atom. Its structure is shown below:

Therefore, the structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol) is 3-chloro-1-hexene.

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Answer:

2,14 g / ml

Explanation:

Sabemos que el volumen de una sustancia es igual al cambio de volumen del agua cuando el objeto en cuestión se sumerge en el agua.

Dado que el volumen original del agua = 50 ml

Volumen de agua después de sumergir el objeto = 120 ml

Masa del objeto = 150 g

Ahora,

Densidad = masa / volumen

Densidad = 150g / 120-50 ml

Densidad = 150/70 ml

Densidad = 2,14 g / ml

Answer:

Its density becomes greater.

Explanation:

If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. ... If the volume of the object stays the same but the mass of the object increases then its density becomes greater.

By definition of density,  the density of an object if the volume increases, but the mass stays the same, will decrease.

You have to know that density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

In other words, the density of a material, be it liquid, chemical, or gaseous, is the ratio of its mass to its volume.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

\(density=\frac{mass}{volume}\)

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

And the higher the volume occupied by a given mass, the smaller the density.

Finally, the density of an object if the volume increases, but the mass stays the same, will decrease.

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The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

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