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Answer:

d. End product is that product with a ketone and carboxylic acid.

Explanation:

\({ \sf{NaBH_{4} : }}\)

Sodium borohydride is a reducing agent, it reduces the ketone to a primary alcohol.

\({ \sf{H _{2} O \: and \: H {}^{ + } }}\)

Then acidified water is an oxidising mixture which reverses the reduction reaction.

Explanation:

Option D is your answer

Hope it helps

The toluene which is sequence of reactions below the works best to prepare the following cyclohexadiene compound is given as follows  :

                 NBS , heat           NaOCH₃       Na, NH₃

Toluene  ------------------>   ----------------->    ------------>

                 CCl₄                    CH₃OH          CH₃OH

The toluene is the substituted aromatic hydrocarbon. the cyclohexadiene is used as the starting material for the synthesis of the natural complex products. the cyclohexadiene  can be formed by the toluene . the synthesis which is the best to prepare the cyclohexadiene  from the compound that is toluene is given as follows :

               NBS , heat           NaOCH₃       Na, NH₃

Toluene  ------------------>   ----------------->    ------------>

                 CCl₄                    CH₃OH          CH₃OH

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Answer:

gelatin and cornstarch

Explanation:

when looking at the data show you can infer the correct answer. hope this helps!

Answer:

Corn Starch and Gelatin

Explanation:

They both give the same as unknown

The final pressure of the gas, when its volume is increased from 3.4 L to 4.0 L at a constant temperature, is approximately 2.55 atm.

To determine the final pressure of a gas when its volume is changed while its amount and temperature remain constant, we can use Boyle's law. Boyle's law states that the pressure of a gas is inversely proportional to its volume at constant temperature.

Mathematically, Boyle's law can be expressed as:

P1 * V1 = P2 * V2

Where:

P1 = Initial pressure

V1 = Initial volume

P2 = Final pressure

V2 = Final volume

In this case, we are given:

P1 = 3.0 atm

V1 = 3.4 L

V2 = 4.0 L

We need to find P2, the final pressure.

Rearranging the formula, we have:

P2 = (P1 * V1) / V2

Substituting the values we have:

P2 = (3.0 atm * 3.4 L) / 4.0 L

P2 = 10.2 atm / 4.0 L

Calculating P2:

P2 = 2.55 atm

Therefore, the final pressure of the gas, when its volume is increased from 3.4 L to 4.0 L at a constant temperature, is approximately 2.55 atm.

Boyle's law demonstrates the inverse relationship between pressure and volume for a gas at a constant temperature. As the volume increases, the pressure decreases, and vice versa, as long as the amount and temperature of the gas remain constant.

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The following are categorized into polar or nonpolar molecules:

a) Beryllium chloride (BeCl₂) is a nonpolar molecule. The Be-Cl bond is polar due to the electronegativity difference between beryllium and chlorine, but the molecule is linear with the two polar bonds pointing in opposite directions, resulting in a net dipole moment of zero.

b) Hydrogen sulphide (H₂S) is a polar molecule. The H-S bond is polar due to the electronegativity difference between hydrogen and sulfur, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

c) Sulphur trioxide (SO₃) is a nonpolar molecule. The S-O bonds are polar due to the electronegativity difference between sulfur and oxygen, but the molecule is trigonal planar with the three polar bonds pointing in different directions, resulting in a net dipole moment of zero.

d) Water (H₂O) is a polar molecule. The H-O bond is polar due to the electronegativity difference between hydrogen and oxygen, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

e) Trichloromethane (CHCl₃) is a polar molecule. The C-Cl bonds are polar due to the electronegativity difference between carbon and chlorine, and the molecule has a tetrahedral shape, resulting in a net dipole moment that is not zero.

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The concentration of the acid is \(0.25 M\).

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.

The titration formula can be given by,

(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)

\(\Rightarrow V_1N_1=V_2N_2\)

Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).

The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).

The equivalence of the base (\(NaOH\)) is \(1\).

Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).

Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).

Let us assume that the normality of the acid (\(HCl\)) \(N_2\).

Substitute the values in the given formula of titration.

\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)

Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).

The equivalence of the acid (\(HCl\)) is \(1\).

Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).

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Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

Answer:

Nitrate NO3

here's your answer, hope it helps you

Answer:

Metals lose electrons when reacting with nonmetals, so the red sphere represents a metal.

Answer:

Yes

Explanation:

it is

Answer:

The number of these organisms in the soil would decrease.

Explanation:

To calculate the molarity of vinegar, we need to know the moles of acetic acid (the main component of vinegar) and the volume of vinegar used.

The change in volume during the titration is:

Change in volume = Final volume - Initial volume

                = 33.5 mL - 12.3 mL

                = 21.2 mL

Assuming that the density of vinegar is approximately 1 g/mL, we can convert the change in volume to grams:

Change in volume (mL) × Density (g/mL) = Mass (g)

21.2 mL × 1 g/mL = 21.2 g

Next, we need to convert the mass of acetic acid to moles. The molar mass of acetic acid (CH3COOH) is approximately 60.05 g/mol:

Moles = Mass (g) / Molar mass (g/mol)

     = 21.2 g / 60.05 g/mol

     ≈ 0.353 mol

Finally, we calculate the molarity of vinegar using the moles and total volume:

Molarity = Moles / Total volume (L)

        = 0.353 mol / 0.0212 L

        ≈ 16.65 M

Therefore, based on the information provided, the molarity of vinegar is approximately 16.65 M.

Answer:

i will tell your teacher that u uding online cheats to answer yout homeworks hhaahaha

Explanation:

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Explanation

To solve this, we consider Boyle's Law:

It relates gas pressure to volume while keeping other parameters such as temperature and amount of substance constant.

Equation we use here is p1 x V1 = p2 x V2 (1)

(p for pressure and V for volume)

p1 = 2.08 atm

V1 = 4.0 L

If the gas expands, the pressure will be lower than 2.08 atm.

p2 = unknown

V2 = 12.0 L

From (1) we clear p2:

=> p1 x V1/V2 = p2

=> 2.08 atm x 4.0 L/12.0 L = p2

=>0.69 atm = p2

Answer: p2 = 0.69 atm

The metal thorium becomes superconducting below the temperature of 1.62 K. Then , the temperature on which the metal become super conducting is - 271.38 °C.

Superconducting is the property of a certain materials that they conduct electricity when cooled below a critical temperature.  The metal thorium is a type-1 super conductor.

Given the critical temperature of thorium = 1.62 K.

We know that the temperature in degree Celsius is converted as follows:

T°C + 273 = T K.

Hence, the critical temperature in kelvin scale is:

1.62 K -273 = - 271.38 °C.

Therefore, the temperature at which thorium is superconducting is  - 271.38 °C.

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The Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

The Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

Thermal energy refers to the movement of particles and therefore both concepts are interrelated.

In conclusion, the Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

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Answer:

Condensation

Explanation:

An exothermic process is one in which heat is lost. Condensation is a change of state from gas to liquid. Thus is loses heat.

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la tierra nuestro planeta es el único del sistema solar que sabe que mantiene vida: vida que es increíblemente diversa,

The mass of calcium in the original urine sample would be 0.0140 g.

First, we need to find the masses of calcium and magnesium oxalates in the original sample. Let x be the mass of calcium oxalate and y be the mass of magnesium oxalate. Then we have:

x + y = mass of the mixed oxalate precipitate

Next, we need to use the information given to find the mass of calcium in the original sample. The mass of calcium oxide formed after ignition is equal to the mass of calcium oxalate in the original sample. We can calculate the mass of calcium oxide using the mass of calcium carbonate formed and the molar mass ratio of calcium carbonate to calcium oxide.

The balanced chemical equations for the reactions are:

CaC2O4 -> CaCO3 + CO2

CaCO3 -> CaO + CO2

The molar mass of CaCO3 is 100.09 g/mol, and the molar mass of CaO is 56.08 g/mol.

From the given information, we have:

0.0433 g = (x + y)(100.09 g/mol + 80.15 g/mol) / (128.10 g/mol + 80.15 g/mol)

0.0285 g = x(56.08 g/mol) + y(40.31 g/mol)

Solving these equations simultaneously, we get:

x = 0.0140 g

y = 0.0053 g

Therefore, the mass of calcium in the original sample (which is equal to the mass of calcium oxide formed after ignition) is:

0.0140 g

So the mass of calcium in the original sample is 0.0140 g.

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The proximity of unsaturated groups (C=C, C=O, aromatic) and electronegative atoms (O, N, halogen) has an impact on the proton NMR chemical shift. Electronegative groups shift to the left (down field; ppm rise).

The chemical shift in nuclear magnetic resonance (NMR) spectroscopy refers to the atomic nucleus' resonant frequency in relation to a standard in a magnetic field. The location and quantity of chemical changes frequently serve as diagnostic indicators of molecular structure.

You take into account the chemically non-equivalent proton(s) one at a time while making chemical shift predictions. Find the origin of each proton or proton pair that is not chemically comparable. Whether the proton(s) is/are linked to a methyl, methene, or methine determines the beginning point.

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Answer:

Discrete atoms

Argon

Molecules

Bromine

Nitrogen

Fluorine

Explanation:

The existence of substances in the elemental form depends on the nature of the substance.

Argon is a noble gas hence it seldom participates in chemical combination therefore it exists as discrete molecules in elemental form.

Bromine, fluorine and nitrogen all exist as diatomic gases because they combine readily with each other to form elemental molecules. An elemental molecule is a molecule composed of the atoms of the same element.

Answer

2722.81 mL

Explanation

Given:

Density = 0.8150 g/mL

Molecular mass CH2O = 30.03 g/mol

Number of formaldehyde, CH2O molecules = 4.450 x 10²⁵ moelcules

You need to first convert the number of molecules of formaldehyde to moles.

To do this, divide the the number of molecules by Avogardro's number

Since molecular mass of 1 mole of CH2O = 30.03 g

Then, the mass of 73.89571571 moles will be

Now we can calculate the mL of space (volume) occupied by the molecules using the formula below

2722.81 mL mL of space were occuppied by the formaldehyde.

The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.

To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:

Given:

Initial concentration of HCl solution = 2 M

Final concentration desired = 3 M

Initial volume of HCl solution = 1 L

Step 1: Calculate the moles of HCl in the initial solution.

Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles

Step 2: Calculate the moles of HCl needed for the desired concentration.

Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles

Step 3: Calculate the moles of HCl to be added.

Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole

Step 4: Convert the moles of HCl to the required volume of concentrated HCl.

To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:

Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl

Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL

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Answer:

The amount of water vapor in air influence density. Water vapor is relatively light compared to diatomic Oxygen and diatomic Nitrogen - the dominant components in air. When vapor content increases in moist air the amount of Oxygen and Nitrogen are decreased per unit volume and the density of the mix decreases since the mass is decreasing.

Explanation:

Answer:Gases and solids , Solids and liquids​

Explanation:

A solid has a definite shape while liquids and gases take the shape of the container in which they are found .

Hence when a substance changes it's state from gas to solid or solid to liquid, it's shape automatically changes as explained above.

Answer:

can someone please do this and put the answers below !!!!

Explanation:

KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

KHPo4 is not considered an effective buffer compared to KH2PO4 due to its limited buffering capacity. The effectiveness of a buffer is determined by the concentration and dissociation properties of its conjugate acid-base pair.

KH2PO4 is a salt composed of the weak acid H2PO4- and its conjugate base HPO4^2-. In an aqueous solution, KH2PO4 can dissociate to release H+ ions from the H2PO4- component, which acts as a weak acid, and the HPO4^2- component can accept H+ ions, acting as a weak base. This allows KH2PO4 to effectively resist changes in pH when small amounts of acid or base are added to the solution.

On the other hand, KHPo4 consists of the strong acid H3PO4 and the weak base HPO4^2-. H3PO4 fully dissociates in water, providing a large concentration of H+ ions, making it difficult for the HPO4^2- to effectively act as a base and maintain pH stability.

Therefore, KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

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Answer:

453 or 453.592

Explanation:

400 jellybeans are about a pound and a pound is 453.592 grams

The concentration of potassium ions, K⁺ in the solution obtained by mixing 480 mL of 0.410 M KOH with 440 mL of 0.290 M K₂SO₄ is 0.491 M

We'll begin by calculating the number of mole of potassium ion, K⁺ in each solution.

Volume = 480 mL = 480 / 1000 = 0.48 L

Molarity = 0.410 M

Mole = Molarity x Volume

Mole of KOH = 0.410 × 0.48

KOH(aq) —> K⁺(aq) + OH¯(aq)

From the balanced equation above,

1 mole of KOH contains 1 mole of K⁺

Therefore,

0.1968 mole of KOH will also contain 0.1968 mole of K⁺

Thus, 0.1968 mole of K⁺ is present in 480 mL of 0.410 M KOH

Volume = 440 mL = 440 / 1000 = 0.44 L

Molarity = 0.290 M

Mole = Molarity x Volume

Mole of K₂SO₄ = 0.290 × 0.44

K₂SO₄(aq) —> 2K⁺(aq) + SO₄²¯(aq)

From the balanced equation above,

1 mole of K₂SO₄ contains 2 moles of K⁺

Therefore,

0.1276 mole of K₂SO₄ will contain = 0.1276 × 2 = 0.2552 mole of K⁺

Thus, 0.2552 mole of K⁺ is present in 440 mL of 0.290 M K₂SO₄

Mole of K⁺ in KOH = 0.1968 mole

Mole of K⁺ in K₂SO₄ = 0.2552 mole

Total mole = 0.1968 + 0.2552

Volume of KOH = 0.48 L

Volume of K₂SO₄ = 0.44 L

Total volume = 0.48 + 0.44

Total mole = 0.452 mole

Total volume = 0.92 L

Molarity = mole / Volume

Molarity of K⁺ = 0.452 / 0.92

Therefore, the molarity of potassium ion, K⁺ in the resulting solution is 0.491 M

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