Calculate each of the following quantities:
(b) Amount (mol) of O atoms in 8.18 g of Ba(NO₃)₂

KOH should not form a precipitate with aqueous Ba(NO3)2. The hydroxide ion (OH-) from KOH can react with the barium ion (Ba2+) to form Ba(OH)2, which is insoluble in water and will precipitate out.

When a soluble barium salt, such as Ba(NO3)2, is mixed with a solution containing a soluble hydroxide, such as KOH, a precipitation reaction can occur if an insoluble compound is formed. However, in this case, Ba(OH)2 is insoluble, so it will precipitate out of the solution. The other options (K3PO4, K2SO4, and K2CO3) do not contain a hydroxide ion and therefore will not form a precipitate with Ba(NO3)2. K2SO4 should not form a precipitate with aqueous Ba(NO3)2. Sulfate ions (SO4²⁻) from K2SO4 do not react with barium ions (Ba²⁺) to form an insoluble compound. The other options (K3PO4, K2CO3, and KOH) can form precipitates with Ba(NO3)2 due to the presence of phosphate, carbonate, and hydroxide ions respectively.

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Answer:

The reduction half-reaction of a redox reaction

Explanation:

(just took the test)

The reduction of half-reaction of a redox reaction. Hence, option B is correct.

An electrolytic cell converts electrical energy into chemical energy or vice versa.

A galvanic cell is an electrochemical cell in which chemical energy is converted to electrical energy. The chemical reaction which drives a galvanic cell is a redox reaction i.e. a reduction-oxidation process.

A typical galvanic cell is composed of two electrodes immersed in a suitable electrolyte and connected via a salt bridge. One of the electrodes serves as a cathode where reduction or gain of electrons takes place. The other half cell functions as an anode where oxidation or loss of electrons occurs. Batteries and fuel cells are examples of galvanic cells.

Hence, option B is correct.

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At 70°C, the KCl solution is unsaturated, but by 0°C, the solution is saturated; therefore, a precipitate will form during cooling.

At 70 ∘C, the KCl solution is unsaturated, meaning that it can dissolve more KCl. However, as the solution is cooled to 0 ∘C, the solubility of KCl decreases, causing the solution to become saturated. Since the solution becomes saturated, any excess KCl will precipitate out of the solution and form a solid. Therefore, a precipitate will form upon cooling.

Undersaturated - Undersaturated solutions have the ability to hold more solute. This means that the solubility has not been reached yet.

Saturated - Saturated solutions hold as much solute as the solubility allows. This means that the amount of solute added to the solution is equal to the solubility.

Supersaturated - Supersaturated solutions hold more solute than the solubility allows for. This means that the amount of solute added is greater than the solubility.

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A statement would be issued to Westfield residents stating the findings of the Reddish-Brown Substance as well as addressing the various claims.

Dear residents of Westfield,

We are writing to inform you about the recent discovery of a reddish-brown substance found in the water supply. After conducting a series of tests and observations, we have determined the identity of the substance.

Firstly, we examined the pipes in the water supply system and found that the reddish-brown substance was present in the pipes. Through analysis of the atomic-scale models, we were able to confirm that the substance found in the pipes is identical to the substance found in the water. Therefore, we make the claim that the reddish-brown substance is the same as the substance that makes up the pipes.

We also investigated whether the reddish-brown substance could be related to the fertilizer used in local agricultural practices. However, after conducting chemical analysis, we found that the reddish-brown substance does not match the composition of the fertilizer. This leads us to conclude that the reddish-brown substance is not the same as the fertilizer.

In conclusion, the reddish-brown substance found in the water supply is not the same as the substance that makes up the pipes or the fertilizer used in local agricultural practices. We apologize for any concern this may have caused and assure you that steps are being taken to address the issue.

Thank you for your attention,

Dr. Yung and team.

That is how the letter should be addressed.

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Phosphorus acts as the reducing agent in this reaction. Chlorine is the oxidizing agent as it gains electrons and gets reduced in the reaction. Hence, option c. phosphorus is the correct answer.

In the given reaction, p4(s) + 10cl2(g) → 4pcl5(s), the reducing agent is phosphorus. This is because reducing agents are those which donate electrons and get oxidized themselves. In the given reaction, phosphorus (P4) loses its electrons and gets oxidized from 0 to +5 oxidation state, while chlorine (Cl2) gains electrons and gets reduced from 0 to -1 oxidation state. Therefore, phosphorus acts as the reducing agent in this reaction. Chlorine is the oxidizing agent as it gains electrons and gets reduced in the reaction. Hence, option c. phosphorus is the correct answer.

In the reaction P₄(s) + 10Cl₂(g) → 4PCl₅(s), the reducing agent is phosphorus (c). A reducing agent is the substance that donates electrons in a redox reaction, causing the other reactant to be reduced. In this case, phosphorus donates electrons to chlorine, allowing chlorine to gain electrons and be reduced. Consequently, phosphorus is the reducing agent in this reaction.

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A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL

Density= mass/volume

Density = 15.2 g/ 43mL

Density = 0.35 g/mL

Question is to find density

Chemical disequilibrium is likely to be present in any system where the forward and reverse reactions are not in balance.

This can occur in a variety of situations, such as when the reactants are not present in the correct proportions, when the reaction conditions are not ideal, or when there are external factors affecting the reaction. For example, in a chemical reaction where one product is constantly being removed from the system, the reaction may never reach equilibrium.

Similarly, in a reaction where the temperature or pressure is constantly changing, the equilibrium may shift in one direction, leading to a chemical disequilibrium. Ultimately, chemical disequilibrium occurs when a reaction is not able to maintain a stable equilibrium state. Chemical disequilibrium is likely to be present in environments where reactions are ongoing and not yet in a stable state. These situations can be found in systems experiencing changes in temperature, pressure, or concentrations of reactants and products. Examples include volcanic areas, hydrothermal vents, or chemical industries where continuous production or consumption of reactants occurs. The presence of chemical disequilibrium provides opportunities for further reactions to take place, leading to new products and potential energy releases. Understanding these environments can offer insights into various natural processes and technological applications.

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Answer:

Explanation:

The balanced chemical equation is Cl2 + 2KBr → 2KCl + Br2. The amount of bromine is calculated as follows:

11.0 g KBr (1mol KBr/119.002g KBr * 1mol Br2/2mol KBr * 159.808g Br2/1mol Br2= 7.39 g Br2.)

Answer:

Butter melts.

Explanation:

Answer: C, negative

Explanation: Electrons give a negative charge, so having more electrons then postiivley charged protons would result in a negative charge.

The partial pressure of H2 in the buret during the experiment can be determined using Dalton's Law of partial pressures. First, we need to find the partial pressure of the dry air in the room by subtracting the water vapor pressure from the total barometric pressure:

Dry air pressure = Total barometric pressure - Water vapor pressure
Dry air pressure = 752.0 mm Hg - 25.2 mm Hg
Dry air pressure = 726.8 mm Hg

Since the experiment is conducted in the same room, the partial pressure of H2 in the buret will be equal to the partial pressure of the dry air in the room. Therefore, the partial pressure of H2 in the buret is 726.8 mm Hg (option 3).

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Answer:

umm i guess if there is a liquid inside it would rise to the top and the metal would sink to the bottom

Answer:

Muscles and Bones?

Explanation:

Logic?

Answer:

I would LOVE to help but im not allowed to put links im sorry :/

Good Luck!

The ribosome only permits the tRNA to attach to the mRNA if it contains carrying an anticodon. The matching bases on the translational and anticodon are bound together by hydrogen bonds.

An attraction connecting two atoms that also take part in other chemical connections is known as a hydrogen bond. Any electronegative element, including oxygen, chlorine, or fluorine, may make up the other atom, whereas one of the atoms is hydrogen.

With one electron, hydrogen will need two to round out its valence shell. All atoms' needs are satisfied by the electron splitting between a carbon atom and four hydrogen atoms. Because the electrons have been shared, the bonds are covalent.

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The volume of a solution of iron (III) chloride is 1565.29 mL when it has a density of 1.118 g/mL and a mass of 1.75 kg.

Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.

In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.

According to the question,

The density of iron chloride solution = 1.118 g/mL.

The mass of iron chloride solution = 1.75 kg.= 1750 g.

The formula for calculating the density is as follows:

Volume = 1750 g/1.118g/mL = 1565.29 mL.

Therefore, the volume of a solution of iron (III) chloride is 1565.29 mL when it has a density of 1.118 g/mL and a mass of 1.75 kg.

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Answer:

Wavelengths towards the red end of the spectrum has a longer wavelength

Explanation:

As seen by this diagram, we can tell that red has the longest wavelength than any other colour. Red has a lower frequency and so carries less energy.

Hope this helps!

Answer:

The first option, aka Opick it up off the gound within 10 seconds, and it's o.k. to eat

Explanation:

The 10 second rule is a rule when you drop foods, but if you get it off the floor under 10 seconds, you can eat it.

Did you know that food picked up under 10 seconds and after 10 seconds has almost the same number of bacterias? The 10 second rule is basically worthless.

The percent dissociation of the propanoic acid and the pH of the species are [HCO₃⁻] = 1.53 x 10⁻⁴M and [CO₃²⁻] = 4.8 x 10⁻¹¹ M.

Propionic acid, having the chemical formula CH₃CH₂CO₂H, is a naturally occurring carboxylic acid. It is a liquid with a strong, foul scent that resembles body odour. Propionates or propanoates are names for the propionic acid salts and esters as well as the anion CH₃CH₂CO₂⁻.

Propanoic acid: HC₂H,O₂ (or) C₂H,COOH Concentration of C,H,COOH = 0.290 M ICE table:

C₂H,COOH + H₂O

C₂H,COO+ H₂O*

Acid ionization constant, K 1.3×10= [C₂H,COO-][H₂O*] [C₂H,COOH] x² (0.290-x)

Since C₂H,COOH is a weak acid, we can assume that (0.290x) M= 0.290 M 1.3×10= 0.290 x= √(1.3×10) (0.290) = 1.94×10-3

According to the equilibrium table, [H3O+] = (x)M=1.94×103 M

[C₂H,COO-]=(x)M= 1.94×103 M [C₂H,COOH ]=(0.290-x)M = (0.290-1.94×103) M s 0.28806 M

s 0.288M

pH = -log[H₂O* ] = log(1.94×103) = 2.71 рон = 14.00-pH = 14.00-2.71 = 11.29 [OH-]= 10-10-1129 = 5.13×10-12 M

Percent dissociation = HCHO ] 1.94×10-3 0.290 M ×100% -x100% 0.669%  = 0.67%.

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The sigma bond in acetylene \((C_2H_2)\) is formed by the overlap of the 1s orbitals of the two carbon atoms and the 2s orbital of the two hydrogen atoms.

To form the sigma bond, the 1s orbital of each carbon atom must overlap with the 2s orbital of the adjacent hydrogen atom. The sigma bond is the strongest type of covalent bond and has the lowest bond dissociation energy.

The approximate bond angle in acetylene is 109.5 degrees. This bond angle is determined by the geometry of the molecule and the arrangement of the atoms in space. The bond angle in acetylene is slightly distorted from a perfect tetrahedral shape due to the electron density distribution in the molecule.  

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The moles of oxygen required to completely react with 1 moles of acetylene is 2.5 mol.

The balanced chemical equation for the reaction is given as:

\(\rm 2\;C_2H_2\;+\;5\;O_2\;\rightarrow\;4\;CO_2\;+\;2\;H_2O\)

The stoichiometric coefficient in the balanced chemical equation gives the information for the moles of products and reactants in the reaction.

From the given balanced chemical equation, for reacting with 1 mole of acetylene, 5 moles of oxygen is required.

The moles of oxygen required to react with 1 mole of acetylene are:

\(\rm 2\;mol\;C_2H_2=5\;mol\;O_2\\\\1\;mol\;C_2H_2=\dfrac{5}{2}\;\times\;1\;mol\;O_2\\\\ 1\;mol\;C_2H_2=2.5\;mol\;O_2\)

The moles of oxygen required to completely react with 1 moles of acetylene is 2.5 mol.

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Answer:650 mL

Explanation:

Remember that Molarity = mol/L. Rearranging the equation to solve for liters you get L = mol/Molarity.

80x10-3 mol / 12x10-2 M = 6.5x10-1 L

6.5x10-1 L (1x103) = 6.5x10 2 mL = 650mL

The pre-1982 pennies are made of an alloy of 95% copper and 5% zinc, while the post-1982 pennies have a copper-plated zinc core and are 97.5% zinc and 2.5% copper.

The densities of these metals differ, with copper being denser than zinc. The density of the pre-1982 penny is 8.94 g/cm³, while the post-1982 penny has a density of 6.87 g/cm³. This means that the metal used in the core of post-1982 pennies is most likely zinc, as its density matches that of the penny. Copper is too dense to be used in the core without significantly increasing the weight and cost of the coin. Zinc is a more cost-effective choice, and the copper plating on the outside of the penny gives it the appearance and conductivity of copper.

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Answer:

Photosynthesis !

Explanation:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Answer:

drug addiction

Explanation:

Wanna take it all back to where it started

Life of the party

Right where my heart at

Soon as what I want come in, I say anything goes

On the road, cool, ridin' 'round with the top down

Nowhere to go to, decide that I'll just ride 'round

She a drug abuser from a broken heart, oh, oh

Got a bad addiction, I been druggin' hard all month long

I'm in that Wraith, I ain't got nothin' but some residue on me

I'm chasin' a check to the morning

I'm in the trenches with smokers and steppers and loners

Somethin' more than one Schedule II on me

Matter fact, just a convicted felon, I'm keepin' my weapon

I'm pourin' more blood on that money

Owe it all to the youngin who feel that he owe the ones

Put addiction 'fore hunger

Answer:

Please check:  6.67×104⁰ .  What is the \(^{0\\\) after the 104? I'll assume this is meant to read:  6.67x10^40 chlorine molecules.

Explanation:

6.67x10^40 molecules

One mole = 6.02x10^23 molecules

(6.67x10^40 molecules)*(1 mole/6.02x10^23 molecules) = 1.10x10^17 moles chlorine

A pentapeptide is a type of peptide or protein molecule made up of five amino acid residues. Peptides are linear chains of amino acids that play important roles in biological processes, such as cell signaling, catalysis, and structure formation.

At pH 1.5, the pentapeptide, ERNFW, would have a positive charge on its nitrogen (N) and negative charge on its carboxyl (COOH) group, causing it to be in its protonated form. At pH 7.0, which is close to neutral, the pentapeptide would be in its neutral form as the positive and negative charges would cancel each other out. At pH 12.5, the pentapeptide would have a negative charge on its nitrogen and positive charge on its carboxyl group, causing it to be in its deprotonated form. The charge of the pentapeptide, ERNFW, changes depending on the pH, affecting its overall structure.

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Answer:

the melting point T = 125.36°C

Explanation:

Given that:

The resistance of a platinum thermometer at  0°C is  \(R_o\) = 160.0 ohms

The resistance of a platinum thermometer when immersed in a crucible containing a melting substance \(R_t\) = 243.8 ohms

The temperature coefficient at room temperature  20°C = ∝ = 0.00392

The objective is to determine the melting point of this substance

To do that ; at 20°C, the resistance of the platinum thermometer can be calculated as follows:

\(R_{20} = R_o(1 + \alpha \Delta T)\)

\(R_{20} = 160(1 + (0.00392 \times (20-0)^0C))\)

\(R_{20} = 160(1 + (0.00392 \times (20))\)

\(R_{20} = 160(1 + (0.0784)\)

\(R_{20} = 160(1.0784)\)

\(R_{20} = 172.544 \ ohms\)

The resistance of the platinum thermometer at t°C , \(R_t\) = \(R_{20}(1 + \alpha \Delta T)\)

\(243.8 = 172.544(1 + 0.00392 \times (T-20)^0C}\)

\(\dfrac{243.8}{ 172.544 }= (1 + 0.00392 \times (T-20)^0C}\)

\(1.413 = (1 + 0.00392 \times (T-20)^0C}\)

\(1.413-1 = 0.00392 \times (T-20)^0C}\)

\(0.413 = 0.00392 \times (T-20)^0C}\)

\(\dfrac{0.413 }{0.00392} = (T-20)^0C}\)

105.36°C = (T - 20) °C

T = 105.36°C + 20 °C

T = 125.36°C

Answer:

Bubbling and fizzing are likely to occur when a new substance is formed. The other examples are simply changing to a different form of the same substance.

Answer:

Uh do you have a picture that can help us answer this question...

Explanation: