Which salt gives the most basic 0. 1 m solution in water?
a. nacl
b. nano2
c. nh4cl
d. nh4no2

A membrane is impermeable to charged molecules and does not allow the passage of ions because the charged molecules possess polarity and the membrane possesses hydrophobic interiors.

Charged hydrophilic molecules of all sizes, from small molecules to giant enzymes, can now be made more soluble via a technique called hydrophobic ion pairing. Hydrophobic molecules having hydrophilic moieties are ionically coupled with charged hydrophilic molecules, and the resulting uncharged complex is water-insoluble and will precipitate in aqueous conditions.

With polar solvents like water or alcohol, hydrophilic compounds can easily establish hydrogen bonds. Ionic (charged) groups with oxygen or nitrogen atoms make up the chemical structure of hydrophilic compounds. Typically, a substance's hydrophilicity is determined by its polarity. A molecule will be hydrophobic overall even if it has polar covalent bonds and these bonds are distributed symmetrically.

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N-Octanol and water are chosen because the connection between a substance's hydrophilicity and lipophilicity is measured by [tex]K_{OW}[/tex] (n-Octanol/Water partition coefficient). When a chemical is more dissolves in fat-like solvents like n-octanol, the value is more significant than one,  when it's more dissolved in water, the value is lower.

What is the partition coefficient?

So, N-Octanol is chosen because it has a carbon/oxygen ratio that is comparable to that of lipids and because it shows both hydrophobic and hydrophilic properties. N-octanol, therefore, resembles the makeup and characteristics of cells and other living things.

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12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.

Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

In the limit of low pressures and high temperatures, where the molecules of the gas move almost independently of one another, all gases obey an equation of state known as the ideal gas law:

PV = nRT,

When Temperature is constant so, it follow Boyle's law:

P1 V1 = P2 V2

P1 = 8.34atm, V1 = 10.28 L, P2 = 6.98atm

V2 = P1 V1 / P2

V2 = 8.34atm x 10.28 / 6.98atm

V2 = 12.28 L

12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.

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Neutrons are required. Atomic Radiation, Nuclear Graphite, and Effects

The fission reaction is often started by an impinging neutron, and each fission produces an average of 2.5 neutrons.

With the exception of the hydrogen nucleus, which has a single proton, neutrons are necessary for the stability of nuclei. Nuclear fission and fusion generate a tonne of neutrons.

Scattering tests and research on nuclear binding energies provide evidence for the nuclear forces' finite range. The neutron-proton (n-p) potential energy map in Figure 44.3a, which was created by scattering neutrons from a target containing hydrogen, illustrates the short range of the nuclear force. The n-p potential energy well is 40 to 50 MeV deep, and the nucleons are prevented from getting much closer than 0.4 fm by a strong repulsive component.

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We need to add one neutron to initiate the fission reaction.

The reaction in which the identity or characteristics of an atomic nucleus change due to the bombarding of it with an energetic particle is known as a nuclear reaction.

The bombarding particle can be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.

In nuclear fission, an atom splits into lighter nuclei due to the bombarding of an energetic particle.

The reaction given is

[tex]_{92}^{235}U + .... _{0}^{1}n \rightarrow _{52}^{137}Te + _{40}^{97}Zr +_{0}^{1}n[/tex]

To find the number of neutrons we have to balance the reaction

Atomic mass on reactant side = 235 + 1 = 236

The atomic number on the reactant side = 92

Atomic mass on the products side = 137+97+2 = 236

The atomic number on the products side = 92

As the reaction is already balanced

We need to add one neutron to initiate the fission reaction.

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The percentage of the original sample which would remain after 17.5 days according to the given half-life of the isotope is; 22.06%.

The given sample in discuss has a half life of; 8.02 days, this therefore indicates that after 17.5 days, the number of half-life periods completed is; 17.5/8.02 = 2.18 half-lifes.

Hence, the percentage of the original sample remaining after 17.5 days can be evaluated as follows;

N = 100% × (0.5)^2.18

N = 100 × 0.22

N = 22.06%.

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The formation of rust (equation above) is an example of both combustion and Synthesis

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Answer:

synthesis

Explanation:

There are 20.046 grams in 0.743 moles of Al.

Mole is the SI unit of measurement of the matter present inside any substance or element. It is denoted by the 'n'.

The formula of finding mole is

n = mass / molar mass

According to the question, to find the mass of Al the formula can be rewritten as mass = moles × molar mass.

Molar mass of Al = 26.98 g/mol.

Moles of Al = 0.743 moles

Therefore, mass of Al = 0.743 moles × 26.98 g/moles

Hence, mass = 20.046 grams

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The mass of precipitate formed if a solution containing 2.34 g of cesium hydroxide is added to a solution containing a large excess of tiso4 is 0.6387 g

Mass of CsOH = 2.34 g

Number of moles of CsOH = 149.9 g / mol

Molar mass of CsOH =  Mass of CsOH / Number of moles of CsOH

                                    = 2.34 / 149.9

Molar mass of CsOH is 0.0156 mol

2 CsOH + TiSO4 → Ti(OH)2 + CsSO4

In this reaction 2 moles of CsOH gives 1 mole of Ti(OH)2

0.0156 mol of CsOH will produce, 0.0156 / 2 = 0.0078 mol

0.0156 mol of CsOH will produce 0.0078 mol of Ti(OH)2

Mass of Ti(OH)2 =  Molar mass of Ti(OH)2 / Number of moles of Ti(OH)2

                            = 0.0078 * 81.88

                            = 0.6387 g

Mass of Ti(OH)2 formed is 0.6387 g

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The mass of precipitate formed is 0.90441 g

cesium hydroxide is added to a solution containing a large excess of TiSo4

The chemical reaction is

2CsOH + TiSo4  →  Ti(OH)2 + CsSo4

The above reaction the Ti(OH)2 is a precipitate formed

Molar mass = mass of a substance / mass of one mole

Mass of CsOH = 2.34 / 149.912

Mass of CsOH = 0.0156 mol

The above reaction 2 mol of cesium hydroxide yield 1 mol of titanium hydroxide

Then, 0.0156 mol of CsOH yield 0.0156 / 2 = 0.0078 mol of Ti(OH)2

The mass of Ti(OH)2 is 115.95

0.0078 mol of Ti(OH)2 = 115.95 X 0.0078

                                      = 0.90441

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Conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests that electrophilic reagents are likely intermediates during these reactions.

Two double bonds and one single bond divide a conjugated diene into two halves. Nonconjugated (Isolated) Dienes have more than one single bond separating two double bonds. Two double bonds are joined to the same atom to form cumulated dienes.

Reagents that function by acquiring electrons or sharing electrons that once belonged to a foreign molecule are referred to as electrophilic reagents, or electrophiles, in some cases. Electrophiles are molecules with a positive charge and a lack of electrons that can react by exchanging electron pairs with nucleophiles, which have many electrons. Epoxides, hydroxy amines, nitroso and azoxy derivatives, nitrenium ions, and elemental sulfur are significant electrophiles.

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A titration is a method for figuring out the concentration of an unknown solution by using a solution with known concentration.

What is Titration?

Titration, commonly referred to as titrimetry, is a quantitative analysis technique that enables chemists to estimate the quantities of specific chemicals in a sample that are unknown.

A known volume of one solution of known concentration (referred to as a titrant) is slowly added to a known volume of another solution of unknown concentration (referred to as analyte) throughout the basic titration procedure until the reaction reaches neutralization.

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The density of rock weighing 1.705 kg is 3.213 gm/ml.

Explanation:

Given;

Volume of rock = 334.5 ml

Weight of rock = 1.075 kg = 1075 gm

By the formula,

Density = Weight in gm/Volume in ml

              = 1075/334.5 gm/ml = 3.2137 gm/ml

Therefore, density of rock is 3.213 gm/ml.

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Answer:

A mixture of salt and sugar can be separated by the process of filtration.

When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the chemical equation

CH₃COOH + CH₃OH ⇄ CH₃COOCH₃ + H₂O

Here

CH₃COOH is Ethanoic acid (Acetic acid)

CH₃OH is Methanol (Methyl Alcohol)

CH₃COOCH₃ is Methyl ethanoate (Methyl Acetate)

H₂O is water

Thus from the above conclusion we can say that When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.

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1-octanal → 1-octanol is an oxidation reaction.

Oxidation

The removal of hydrogen or any other electropositive element, or the addition of oxygen, is said to be the process of oxidation in classical or earlier concepts. The process of an atom or ion losing one or more electrons is known as oxidation, according to the electronic notion.

An oxidizing agent is something that causes oxidation. O2, S, Cl2, Br2, and H2O2 are oxidizing agents in the instances above. Oxidation has an easy source. When an atom, molecule, or even an ion comes into contact with oxygen, oxidation results. When this occurs, it changes to achieve a more stable structure in its electron shells and transfers electrons as a result.

Any chemical process, including oxidation, is primarily brought on by atoms attempting to obtain valence shells with a complete complement of electrons. The stability of the species is increased by this optimum configuration.

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The surfaces of the cylinder block and cylinder head are interconnected to help cool the engine.

When an automobile engine is running, it generates a lot of heat and needs to be continuously cooled to prevent engine damage.

This is typically accomplished by pumping coolant liquid—often water combined with antifreeze solution—through unique cooling tubes. Air passing across cylinder casings with fins helps cool some engines.

The cylinder head and block of a water-cooled engine are interconnected by coolant channels. All of the channels come together to form a single exit at the top of the cylinder head.

Hot coolant is forced out of the engine and into the radiator, which serves as a type of heat exchanger, by a pump that is driven by a pulley and belt from the crankshaft.

Unwanted heat is transferred from the radiator into the air stream, after which the cooled liquid flows back into the channels after returning to an entrance at the bottom of the block.

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Molarity of the solution is 0.0527 M.

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.

Assume there is 1 kg of solvent present in the beginning.

Thus, the mole of solute is 0.0480 moles of LiF.

Molar mass of LiF = 25.939 grams/mole

0.0480 mol LiF x 25.939 g/1 mol LiF = 1.245 g LiF

Mass of the solution = 1001.245 g

The molarity of the solution can be determined as illustrated using the supplied density and moles of solute.

[LiF] = mol LiF/ volume of solution

[LiF] = 0.0480 mol/1001.245 g x 1ml/1.10g x 1L/1000mL

Hence, the molarity of LiF = 0.0527 M

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The molar solubility of saturated solution of magnesium hydroxide  in water will be 1.4 × [tex]10^{-4}[/tex].

The concentration of such ions in a suitable solvent that will be in equilibrium with both the solid substance is known as the solubility product, or Ksp, of such an ionic compound.

When a chemical substance in the solid form would be in chemical equilibrium with such a solution of that molecule, a solubility equilibrium would be a sort of dynamic equilibrium that develops.

The molar solubility of magnesium hydroxide can be expressed as:

[tex]K_{sp} = [Mg^{2+} ][OH^{-} ]^{2}[/tex]

Let the molal solubility will be S.

[tex]K_{sp} = S(S^{2} )\\1.2 * 10^{-11} = 4S^{3} \\(S)^{3} = 0.3 *10^{-11} \\S = 1.4 *10^{-4}[/tex]

Therefore, the molar solubility of saturated solution of magnesium hydroxide  in water will be 1.4 × [tex]10^{-4}[/tex].

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The compound is classified as a secondary amine

Two organic substituents (alkyl, aryl, or both) are bonded to the nitrogen together with one hydrogen in secondary amines. Dimethylamine is a significant representation, while diphenylamine is an example of an aromatic amine. Secondary amines are amines that have two alkyl or aryl groups in place of the two hydrogen atoms of ammonia.

The molecule is methylpropylamine, a secondary amine because the nitrogen atom has both a methyl group and a propyl group. Compared to primary amines, secondary amines are more basic. The NH2 group is joined to the electron-withdrawing C6H5 group in aromatic amines. As a result, there are fewer single electron pairs available on N. Alkyl amines are hence more basic than aromatic amines.

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Answer:

c )   16

Explanation:

C4 H10 O    +   6 O2  =====>  4  CO2  +   5  H2O

1 + 6 + 4 + 5 = 16

Answer:

C.) 16

Explanation:

An equation is balanced when there are equal amounts of each element on both sides of the reaction. These values can be modified by adding coefficients.

The unbalanced equation:

C₄H₁₀O + O₂ -----> CO₂ + H₂O

Reactants: 4 carbon, 10 hydrogen, 3 oxygen

Products: 1 carbon, 2 hydrogen, 3 oxygen

The balanced equation:

1 C₄H₁₀O +  6 O₂ -----> 4 CO₂ + 5 H₂O

Reactants: 4 carbon, 10 hydrogen, 13 oxygen

Products: 4 carbon, 10 hydrogen, 13 oxygen

Now, you can add the coefficients:

1 + 6 + 4 + 5 = 16

The pH of the solution is the negative logarithm of a proton or the hydrogen ion concentration. The pH of 0.39 M acetic acid solution (CH₃COONa) is 2.58.

The pH has been said to be the hydrogen ion concentration that can also be given by the pOH.

Given,

The acid dissociation constant Ka = 1.8 × 10⁻⁵

Concentration of acetic acid (C) = 0.39 M

The hydrogen ion concentration from Ka and molar concentration are calculated as:

H⁺ = √ Ka × C

= √1.8 × 10⁻⁵ × 0.39

= √0.00000702

= 0.0026

Now, pH from hydrogen ion is calculated as,

pH = - log [H⁺]

= - log [0.0026]

= 2.58

Therefore, the pH of acetic acid is 2.58.

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The moles of hydrogen in the talc sample are 5.67 moles.

Talc are the hydrous silicate minerals. The chemical formula of talc is Mg₃Si₄O₁₀(OH)₂.

From the formula it can be determined that there are: 3 moles of Mg, 4 moles of Si, 12 moles of O and 2 moles of H.

Moles are a type of SI unit of measurement of the amount of substance.

According to the question, magnesium = 8.5 moles

Also, 3 moles of Mg = 2 moles of H

Therefore, moles of H = 8.5 moles × (2 moles H / 3 moles Mg)

                 moles of H = 5.67 moles

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Oxidation is "Increase in oxidation number" as well as loss of electrons.

A rise in oxidation number results from the loss of negative electrons, whereas a reduction in oxidation number results from the gain of electrons. As a consequence, the oxidized element or ion experiences a rise in oxidation number.

As a result of losing electrons in the process, a reactant oxidizes. When a reactant obtains electrons during a reaction, reduction takes place. This frequently happens when acid and metals react.

Therefore, Oxidation is "Increase in oxidation number" as well as loss of electrons.

Hence, the correct answer will be option (e)

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Because of the enzyme action of Amylase, the chemical breakdown of starch happens in the mouth.

It is an enzyme, simply a type of protein that aids in breaking down the carbohydrates in your body. The main two glands as the pancreas and salivary glands help in making amylase in your mouth.

A small amount of amylase is also present in your urine and blood. If the levels present in your body are high then it causes health problems.

The amylase test performs to know the amount of amylase present in your body. This test is called as "amy test".

The normal range of Amylase in the human body is 40 to 140 U/L or 0.38 to 1.42 microkat/L.

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If density of gold is 19.3g/cm3 amd mass is 5.23 g, then volume obtained is 0.27cm3.

Density is defined as how much a matter is packed in given area. It is represented by ρ.

ρ = m/ V

Given,

density of gold = 19.3 g/cm3

mass of gold = 5.23 g

As we know that,

density = mass/ volume

mass = density× volume

19.3 = 5.23 / volume

volume = 5.23/19.3

volume = 0.27 cm3.

Thus, if density and mass is given volume can be obtained.

Volume of gold is given as 0.27 cm3.

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Answer:

67° C   increase

Explanation:

235 gm   *   4.186 J /g-C  *    x     =  66 000 J          x = degree change C°

x = 67 degrees C

Answer:

156.16 gm of ice

Explanation:

I will assume the ice starts at  0 C

As the ice melts, it produces water at  0 C  so we do not need to calculate THAT water being cooled....only the 356 ml being cooled to 0 C

356  gm *  4.186 j/gm-c  * (35 c)   = 52157.56 j

  this is the heat absorbed by the melting ice

x gm * 334 j / gm   = 52157.56 j           (334 j/gm is heat of fusion of water)

x = 156.16 gm of ice required

The average acceleration from the following data points is 20.625 m/s^2.

We know that average acceleration = change in speed / change in time
here,

change in speed = v2-v1

                          = 975-150

                          = 825 m/s

change in time   = t2 - t1

                         = 55 - 15

                         = 40 s

now, putting all the values, average acceleration = 825 / 40

                                                                             = 20.625 m/ s^2 .

what is acceleration?

The rate at which an entity's velocity with regard to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.

The SI unit of acceleration is metre per second square (m/s^2).

An average acceleration the speed at which velocity changes, the evolution of velocity through time, or the instantaneous acceleration ( acceleration at a given moment ) .

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Answer:

80.96 L

Explanation:

START WITH

P1 V1 = P2 V2

V2 = P1 V1 / P2

    =  751 * 38.7 / 359 = 80.96 L

According to Boyle's law, where the temperature remains constant the volume of the gas if the pressure changes to 359 mm Hg is 80.95 ml.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

Substitution in the above equation gives ,V₂=751×38.7/359=80.95 ml.

Thus, the volume of gas at 359 mm Hg pressure is 80.95 ml.

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The average person will absorb no more than 500 mg of calcium at one time.

So, option B is correct one.

For maximum absorption, no more than 500 mg of calcium should be taken in a single dose. The absorption of the minerals is actually lower by taking too high an amount of calcium at one time from a supplement. Calcium is absorb from the food. If you think you need more a calcium supplement , ask your doctor or dietitian to recommend one. Taking too high amount of calcium at one time, particularly from a supplement , can actually lower the absorption of the mineral.

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