Which one of the following salts, when dissolved in water, produces the solution with the most basic pH?
a RaO
b CH3CH2NH3Br
c NaHCO3
d RbClO4

The statement that is true about strong electrolytes , weak electrolytes , and non-electrolytes is:

Silver chloride (AgCl) is insoluble in water; option D.

Chloride (Cl-) ion is soluble in water; option C

Potassium iodide (KI) and silver nitrate (AgNO₃) will result in a precipitate, according to solubility rules; option D.

Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions; option A.

The volume of sodium chloride solution required is calculated using the formula:

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 500 mL = 0.500 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.500 L)/(0.500 M)

V1 = 0.100 L

The volume of the 0.500 M sodium chloride solution required is 0.100 L.

15. The volume of the original solution required will be;

M1V1 = M2V2

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 250 mL = 0.250 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.250 L)/(0.500 M)

V1 = 0.050 L or 50.0 mL

The volume of the original 0.500 M hydrochloric acid solution needed is 50.0 mL.

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The IHD for the given formula is 5. There could be five double bonds present in the molecule. There could be five rings present in the molecule.

To calculate the index of hydrogen deficiency (IHD) for the given formula C₇H₁₀NBRC₇H₁₀NBR, we need to determine the molecular formula's degree of unsaturation. The formula can be simplified to C₁₄H₂₀N₂BR₂, assuming all the atoms are bonded to each other.

The formula for calculating IHD is:

IHD = 0.5 × (2C + 2 + N - X - H)

Where:

C = number of carbon atoms

N = number of nitrogen atoms

X = number of halogen atoms (in this case, bromine, so X = 2)

H = number of hydrogen atoms

Let's calculate the IHD for C₁₄H₂₀N₂BR₂:

C = 14

N = 2

X = 2

H = 20

IHD = 0.5 × (2(14) + 2 + 2 - 2 - 20)

= 0.5 × (28 + 2 + 2 - 2 - 20)

= 0.5 × 10

= 5

Therefore, the IHD for the given formula is 5.

Based on the IHD value, we can determine the types of unsaturation that might be present in the molecule. Here are the possibilities:

Double Bonds (Alkenes): Each double bond contributes 1 to the IHD. So, there could be five double bonds present in the molecule.

Rings (Cyclic Structures): Each ring contributes 1 to the IHD. So, there could be five rings present in the molecule.

A Combination of Double Bonds and Rings: It is also possible to have a combination of double bonds and rings. For example, there could be three double bonds and two rings, or two double bonds and three rings, or any other combination that adds up to an IHD of 5.

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Most acid waves used in salons have a pH value between 4.5 and 7.0. The pH value of an acid wave determines its strength and the degree of curl that can be achieved on the hair.

A lower pH value indicates a stronger acid and a tighter curl, while a higher pH value indicates a weaker acid and a looser curl. Acid waves are typically milder than alkaline waves, which have a pH value of around 9.0-9.6 and are less damaging to the hair.

It is important to choose the right strength of acid wave based on the type and condition of the hair. Fine or damaged hair requires a milder acid wave, while coarse or resistant hair requires a stronger one. Acid waves are typically left on the hair for a shorter period of time than alkaline waves, which reduces the risk of overprocessing and damage to the hair.

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Answer:

Hydrogen bond strengths range from 4 kJ to 50 kJ per mole of hydrogen bonds. In molecules containing N-H, O-H or F-H bonds, the large difference in electronegativity between the H atom and the N, O or F atom leads to a highly polar covalent bond (i.e., a bond dipole).

Explanation:

Answer:

i think its C

Explanation:

Wax's tendency to melt can describe a chemical property of a substance. Therefore, option (D) is correct.

A chemical property can be described as any of a material's properties that becomes evident during a chemical reaction. Any quality can be established only by changing the chemical identity of the substance. Chemical properties cannot be evaluated by viewing or touching the substance.

The internal structure of the substance must be affected greatly for its chemical properties to be investigated. When a substance undergoes a chemical reaction, its properties will change drastically, resulting in a chemical change.

Chemical properties are contrasted with physical properties and can be used for building chemical classifications. They are also useful to identify an unknown substance.

As the wax melt, it also burns and hives the carbon dioxide, water, heat, and light. Therefore, the wax's tendency to melt and burn is a chemical property.

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Answer:

The reaction combines the sodium with the hydrogen and oxygen in water to form sodium hydroxide and hydrogen gas, and you get a lot of energy released as heat as well. This heat actually melts any remaining sodium that has not reacted yet, and ignites the hydrogen gas, so you get the bang and the flash.

Explanation:

She will create a solution.

Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

An unsaturated solution is the remedy. Potassium nitrate dissolves in water at thirty degrees Celsius at a rate of 45 grams per one hundred g of water.

Per the UK's health service, adults should take in roughly 3,500mg of potassium daily. A healthy person can eat at least seven and a half bananas before consuming the advised amount of potassium because the typical banana, weighing 125g, provides 450mg of potassium.

Potassium should be a priority in a person's diet. The following foods are good sources of potassium: dried apricots, lentils, zucchini, prunes, potatoes, kidney beans, & bananas. The greatest potassium is present in apricots.

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Answer: 34.425 g

Explanation:

2.7*12.75=34.425 g

The formed cyclopropane has cis stereochemistry.

Chiral cyclopropane rings are important pharmacophores in pharmaceutical drugs and bioactive natural products, so libraries of these building blocks are an important resource for drug research and development campaigns.

A synthesis is a set of two or even more reactions that are designed to produce a specific end product. A synthetic step is a single reaction that has to be carried out independently of the other reactions in a synthesis.

The number of steps inside a synthetic sequence equals the number of reactions that need to be performed separately, i.e. the number of reactions that comprise the sequence.

By stereospecific addi-tion of singlet carbenes, cis cyclopropane could be synthesized from cis alkene. Using a Lindlar catalyst, cis alkene could be synthesized from alkynes.

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Therefore, the molar solubility of Ni(OH)₂ when buffered at pH = 13.2 is approximately 3.2 x 10⁻¹⁶ mol/L.

The molar solubility of Ni(OH)₂ when buffered at pH = 13.2 can be calculated using the following steps:

Write the balanced chemical equation for the dissolution of Ni(OH)₂ in water:

Ni(OH)₂(s) ⇌ Ni²⁺(aq) + 2OH⁻(aq)

Write the expression for the solubility product constant (Ksp) for Ni(OH)₂:

Ksp = [Ni²⁺][OH⁻]²

Write the expression for the ion product (IP) for Ni(OH)₂:

IP = [Ni²⁺][OH⁻]²

Write the expression for the equilibrium constant (Keq) for the reaction:

Keq = [Ni²⁺][OH⁻]² / [Ni(OH)₂]

Write the expression for the concentration of hydroxide ions (OH⁻) in terms of pH:

[OH⁻] = 10^(-pH)

Substitute the values into the expression for Keq and solve for [Ni²⁺]:

Keq = [Ni²⁺][OH⁻]² / [Ni(OH)₂]

Keq = [Ni²⁺](10^(-pH))² / [Ni(OH)₂]

[Ni²⁺] = Keq[Ni(OH)₂] / (\(10^{-pH}\)))²

[Ni²⁺] = 1.6 x 10⁻¹⁶

Calculate the molar solubility of Ni(OH)₂:

molar solubility = [Ni(OH)₂] = 2[Ni²⁺] molar solubility ≈ 3.2 x 10⁻¹⁶ mol/L

Therefore, the molar solubility of Ni(OH)₂ when buffered at pH = 13.2 is approximately 3.2 x 10⁻¹⁶ mol/L.

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Answer:

Propane

Explanation:

The molar heat capacity of a substance is the amount of heat needed to change the temperature of 1 mol of that substance by 1 K.

The molar heat capacity of a substance is a physical property that describes the amount of heat energy required to raise the temperature of one mole of the substance by one Kelvin (or one degree Celsius). It is typically denoted by the symbol Cm and has units of joules per mole per Kelvin (J/(mol K)).

The molar heat capacity of a substance depends on various factors such as the nature of the substance, its phase (solid, liquid, or gas), and the conditions under which the temperature change occurs (constant pressure or constant volume).

For example, the molar heat capacity of a gas at constant pressure is usually greater than its molar heat capacity at constant volume, because the gas is allowed to expand and do work on its surroundings at constant pressure, which requires additional energy input.

The molar heat capacity is an important property in thermodynamics and is used in many calculations involving heat transfer, energy conversion, and chemical reactions. It is also used to determine the specific heat capacity of a substance, which is the amount of heat energy required to raise the temperature of a unit mass of the substance by one Kelvin (or one degree Celsius).

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To solve this, we need to calculate the reflection coefficients for parallel. perpendicular polarizations using the Fresnel equations

To calculate the percentage of reflected wave power in the parallel and perpendicular polarizations, we need to consider the angle of incidence and the dielectric constant of water.

Calculation of the angle of refraction:

Using Snell's Law: sin(40°) / sin(θ) = 1 / 1.33

Solving for θ, we find: θ ≈ 30.22°

Calculation of reflection coefficients:

For perpendicular polarization (s-polarization):

Rs = ((n1 * cos(θi) - n2 * cos(θt)) / (n1 * cos(θi) + n2 * cos(θt)))^2

Substituting the values:

Rs = ((1 * cos(40°) - 1.33 * cos(30.22°)) / (1 * cos(40°) + 1.33 * cos(30.22°)))^2

Therefore, Rs ≈ 0.046

For parallel polarization (p-polarization):

Rp = ((n2 * cos(θi) - n1 * cos(θt)) / (n2 * cos(θi) + n1 * cos(θt)))^2

Substituting the values:

Rp = ((1.33 * cos(40°) - 1 * cos(30.22°)) / (1.33 * cos(40°) + 1 * cos(30.22°)))^2

Therefore, Rp ≈ 0.139

Calculation of the percentage of reflected wave power in each polarization: The percentage of reflected wave power in each polarization can be calculated by multiplying the reflection coefficients by 100.

Percentage of reflected power in perpendicular polarization = Rs * 100 ≈ 4.6%

Percentage of reflected power in parallel polarization = Rp * 100 ≈ 13.9%

Calculation of the percentage of sunlight power density that gets through the polarized sunglasses:

Since sunlight contains equal power densities in both parallel and perpendicular polarizations, we assume that the incident sunlight is evenly distributed between the two polarizations. Therefore, the percentage of sunlight power density that gets through the glasses would depend on the percentage of vertically polarized light in the incident sunlight.

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

In the following question, among the given options, The homogeneous mixture is opaque and has particles large enough to be filtered, The correct answer is D) Both colloids and suspensions.

A colloid is a homogeneous mixture composed of two or more substances with particles larger than molecules, but still too small to be filtered. Colloids are usually opaque. A suspension is also a homogeneous mixture composed of two or more substances, but with particles large enough to be filtered. Suspensions are usually also opaque.
Therefore, both colloids and suspensions are homogeneous mixtures that are opaque and have particles large enough to be filtered.

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Atoms exchange or share electrons during bonding to obtain stability by completing their valence shells and also to achieve a lower energy state.

Atoms exchange or share electrons during bonding because of the force of attraction between two oppositely charged ions or particles called the electrostatic force. This force of attraction results in the formation of a bond, holding two atoms together within a compound.

The electrons are either shared or exchanged because they determine the chemical reactivity of an atom and are responsible for forming bonds between atoms. Atoms bond with each other to complete their outer shells and obtain stability, which is usually achieved by acquiring eight electrons in their valence shells. This is known as the octet rule.

The main types of chemical bonds that atoms form include covalent bonds and ionic bonds. Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another. Ionic bonding occurs between atoms that have a large difference in electronegativity, whereas covalent bonding occurs between atoms with a small difference in electronegativity.

In conclusion, atoms exchange or share electrons during bonding to obtain stability by completing their valence shells and also to achieve a lower energy state.

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Answer:

5.12x10¹¹ millimeters

Explanation:

Milli is a prefix used in science and engineering to decribe the number as the exponent x10⁻³. In the prefix kilo, the number is at the exponent x10³.

5.12x10⁵ kilometers are:

5.12x10⁵ kilometers * (1000m / 1km) = 5.12x10⁸ meters

5.12x10² meters * (1m / 1000millimeters) = 5.12x10¹¹ millimeters

The property of ionic compounds that is important to support the function in the circulatory system is conductivity.

Conductivity is the ability of a material to conduct electricity or heat.

According to this question, the concentration of ionic substances is important for the heart to beat because our heart responds to electrical impulses that travel through heart cells that are made up mostly of water.

Ionic substances are known to have the ability to conduct electrical charges, hence, conductivity is an inspiration property of ionic compound that supports this function.

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Answer:

Theory.

Explanation:

It is called a theory.

The following which are medical applications of radiation include the following below:

This is referred to as the transmission of energy through space and it usually occurs at the speed of light thereby making it a very fast method of heat transfer when compared to the others. Radiation are used for various purposes such as immigration for searching luggage etc.

It is also used for medical reasons such as cancer therapy as the radiation help in destroying the cancerous cells thereby making it easy for their removal from the body system. It is also used for genetic engineering in the creation of new types of substances through the modification of nucleic acids such as DNA etc.

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The isomer with the higher equilibrium vapor pressure at 20 celsius is the cis-isomer of 1,2-dichloroethene. This is because the cis-isomer has a more symmetrical structure, with the two chlorine atoms on the same side of the double bond, which allows for stronger intermolecular forces of attraction between molecules.

These stronger intermolecular forces lead to a higher boiling point and vapor pressure.
On the other hand, the trans-isomer has a less symmetrical structure, with the two chlorine atoms on opposite sides of the double bond, which leads to weaker intermolecular forces of attraction between molecules. As a result, the trans-isomer has a lower boiling point and vapor pressure than the cis-isomer.
Overall, the molecular structure of each isomer plays a critical role in determining its vapor pressure. The more symmetrical the structure, the stronger the intermolecular forces and the higher the vapor pressure. In this case, the cis-isomer has a more symmetrical structure and thus has a higher equilibrium vapor pressure at 20 celsius.

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d) The concentration of carbonic acid will increase if the pressure of carbon dioxide is increased in the container.

According to Le Chatelier's principle, if the pressure of carbon dioxide is increased in the container, the system will shift in a direction that reduces the pressure. In this case, it means the equilibrium will shift towards the formation of more carbonic acid. The increase in pressure will cause more CO₂ molecules to dissolve in water, leading to an increase in the concentration of carbonic acid.

The reaction CO₂ + H₂O ⇌ H₂CO₃ is an equilibrium reaction, and changing the pressure affects the equilibrium position. By increasing the pressure of CO₂, the equilibrium will favor the formation of more carbonic acid to alleviate the increased pressure. Therefore, the concentration of carbonic acid will increase as a result of the increased CO₂ pressure. The other options (a, b, c, e) are not accurate as they do not take into account the impact of the increased CO₂ pressure on the equilibrium.

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Answer:

The temperature will be colder on December.

Explanation:

It is given that the angle of the sun rays on June 21st on St. Louis, Missouri hits at 75° angle. And on December 21st, the sun rays are at an angle of 28°.

Now, St. Louis, Missouri is located in the middle of United States which is in the Northern hemisphere.

From here, we can conclude that the temperature of St. Louis, Missouri on December 21st will be much colder as the rays of the Sun is at a much lower angle on the surface than on the 21st June. Due to this lower angle of the sun rays, the energy of the sun will be more spread out and will be less concentrated on the surface on 21st December when compared to 21st June. Also the days are much shorter in December than in June.

Answer:

carbon-14

Explanation:

becouse protons and neutrons are nagetivly charged

Answer:

C

Explanation:

Boyle's law states that "the volume of a given mass of gas is inversely proportional to its pressure at constant temperature."

Inverse proportionality means that as one quantity is increasing, the other quantity is decreasing and vice versa.

Hence, as the pressure was increased, the volume decreases accordingly in obedience to Boyle's law.

Answer:

What is TRUE about the missing volume is option C.

C. The volume will decrease due to inverse relationship of V & P

Explanation:

The given parameters of the gas are;

The initial pressure of the gas, P₁ = 2 atm

The initial volume of the gas, V₁ = 1.5 L

The final pressure of the gas, P₂ = 2 atm

Boyle's law states that, at constant temperature, the volume, 'V', of a given mass is inversely proportional to its pressure, 'P';

Mathematically, Boyle's law can be expressed as follows;

P ∝ 1/V

From which we have;

P·V = Constant

∴ P₁·V₁ = P₂·V₂

For the given gas, we get;

2 atm × 1.5 L = 6 atm × V₂

∴ V₂ = 2 atm × 1.5 L/(6 atm) = 0.5 L

Therefore, the volume decreases from 1.5 L to 0.5 L.

Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.