Do nucleophilicity and electronegativity follow the same trend or opposite trends?

Answer:

may be the answer is Heat and pressure - melting - cooling

Energy required : 2508 J

Given

V= 120 ml

Δt = 5°C

Required

Heat needed

Solution

Heat can be formulated :

Q = m.c.Δt

m = mass, g  

c = specific heat, joules / g °C  (water=4.18 J.g °C)

∆T = temperature difference, ° C / K  

mass water = 120 g(density = 1 g/ml)

Input the value :

Q = 120 g x 4.18 J.g °C x 5 °C

Q = 2508 J

It would be A, Petroleum.

Hope this helped!

-William

The pressure of a gas is directly proportional to its volume, according to Boyle's Law. this pressure is less than the maximum pressure that the can can withstand (3,800 kPa), the can will not burst.

Therefore, we can use the following equation to find the pressure of the gas in the can after it is crushed: P1V1 = P2V2 where P1 and V1 are the initial pressure and volume of the gas, and P2 and V2 are the final pressure and volume of the gas, respectively. Given that the initial volume (V1) of the gas in the can is 235 mL and the initial pressure (P1) is 110 kPa, we can substitute these values into the equation P1V1 = P2V2 110 kPa × 235 mL = P2 × 8.5 mL Solving for P2, we get: P2 = (110 kPa × 235 mL) / 8.5 mL P2 = 3,027 kPa Therefore, the pressure of the gas in the can after it is crushed to a volume of 8.5 mL is 3,027 kPa. Since this pressure is less than the maximum pressure that the can can withstand (3,800 kPa), the can will not burst.

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Answer:

All of us are exposed to radiation every day, from natural sources such as minerals in the ground, and man-made sources such as medical x-rays. According to the National Council on Radiation Protection and Measurements (NCRP), the average annual radiation dose per person in the U.S. is 6.2 millisieverts (620 millirem).

Explanation:

Answer: D

Explanation:

I just did it

A toxicant is a substance such as heavy metals, chemical compounds, and excessive concentrations of nutrients that degrades the environment and is harmful to organisms.

Various criteria can be used to categorize chemical substances. One such analysis is founded on the distinct components present. For instance, hydrides, oxides, and halides all contain one or maybe more hydrogen atoms as well as one or maybe more halide (Group 17) atoms.

A compound is created when two or more components mix through a chemical reaction. A chemical changes involving simple molecules and elements results in the formation of large compounds like proteins.

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Normal cells can fail to respond to a chemical signal due to various factors, including receptor defects, intracellular signaling pathway disruptions, and alterations in gene expression and protein synthesis.

Normal cells receive chemical signals through specific receptors on their surface or within the cell. These receptors are responsible for initiating a cascade of intracellular events that ultimately lead to a cellular response. However, certain factors can impede the ability of a normal cell to respond to a chemical signal.

One common reason is receptor defects. Mutations or alterations in the receptors can render them less responsive or completely non-functional, preventing the cell from properly detecting the chemical signal. Another possibility is disruptions in the intracellular signaling pathways. These pathways relay the signal from the receptor to the nucleus, where gene expression and protein synthesis are regulated. Disruptions in these pathways can occur through mutations or dysregulation of signaling molecules, impairing the transmission of the signal and hampering the cell's ability to respond.

Furthermore, alterations in gene expression and protein synthesis can also hinder a cell's response to a chemical signal. If the genes encoding proteins involved in the cellular response are not properly activated or if the proteins themselves are not synthesized correctly, the cell may fail to execute the appropriate response.

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Answer:

Why do some normal cells fail to respond to a chemical signal?◦ Some cells are completely without receptors.◦ Some cells lack the appropriate receptors.◦ Some cells are completely without ligands.◦ Signal chemicals often break down before reaching a distant target.◦ Chemical signals are only delivered to specific cells.

3. Small batch scheduling is not an element of lean manufacturing.

Lean manufacturing is a production technique that primarily aims to shorten response times from suppliers and consumers as well as times spent in the production system. It is an approach that emphasizes avoiding waste in production systems while also boosting productivity. 

Seven elements of lean manufacturing are given below:

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Answer:

46.97g

Explanation:

Hello,

To find the theoretical yield, we must first of all get the equation of reaction right in order to know how the compounds combine together.

Equation of reaction;

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

From the equation of reaction,

2 moles of C₂H₆ reacts with 7 moles of O₂ to produce 4 moles of CO₂.

Number of moles = mass / molar mass

Mass = number of moles × molar mass

Mass of CO₂ = 4 × 44 = 176g

Mass of C₂H₆ = 2 × 30 = 60g

Mass of O₂ = 7 × 32 = 224g

Therefore, 224g + 60g (O₂ + C₂H₆) = 176g of CO₂.

284g of reactants = 176g of product(CO₂)

(18 + 57.8)g of reactants = x g of products(CO₂)

X = (75.8 × 176) /284

X = 46.97g of CO₂.

Theoretical yield of CO₂ is 46.97g

Answer:

They need to put a question that has an error in it

Answer:

The capillary tube was too close to the bottom of the beaker.

The ruler may have moved.

Water got into the capillary tube.

The temperature was not allowed to equilibrate in the 2-4 minutes

Explanation:

K+ ion has 18 electrons and Argon also has 18 electrons so they do have the same electronic structure.

However, Al3+ ion has 10 electrons and Argon has 18 electrons, so they do not have the same electronic structure.

We are told that starch consists of glucose polymer, so we can assume that the caloric value of starch will be equal to the caloric value of glucose, that is, 3.9kcal/g.

Now to determine the kcal and kJ there were in the potato we must calculate the mass of starch present in that potato. We are told that it is 92% starch, therefore the mass of starch in the potato will be:

We have that in the potato there are 160.08 grams of starch. By multiplying it by the caloric value we will have the kcal that were in the potato, assuming that the rest of the ingredients do not contribute caloric value, or it is insignificant.

To calculate the kJ we must make the conversion using the relationship that 1 cal is equal to 4.184 joules:

In the potato, there were 624 kcal of energy or 2612kJ of energy.

After 24 days, you will have 1/2 kg

It's a common occurrence for radioactive isotopes to spontaneously decay over time, shedding their radioactive atoms. The period of time it takes for any sample of an element to be reduced to half its initial amount is known as the half-life of a radioactive isotope. The differential equation

dNdt=kN(t)

describes the decay of such radioactive isotopes, where N(t) is the number of radioactive atoms of the element that are still present at time t and k is the decay constant.

The solution to the aforementioned differential equation is N(t) = N (0)ekt, where N (0) is the initial sample's initial number of atoms.

Keep in mind that the natural logarithm has the identity

a ln n=a ln n.

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15.64 g of NaCl is added to a 250.0 ml volumetric flask and then water is added to the line. One milliliter of this solution weighs 1.043 grams. 15.64 g is the mass of the solute.

To find the mass of the solute (NaCl), we need to use the given information to calculate the concentration of the solution (in units of grams per milliliter), and then use that concentration to calculate the mass of NaCl in the solution.

First, we can calculate the total mass of the solution by multiplying the volume (250.0 mL) by the mass per milliliter (1.043 g/mL):

250.0 mL x 1.043 g/mL = 260.75 g

Next, we can calculate the mass of the solvent (water) by subtracting the mass of the solute (NaCl) from the total mass of the solution:

260.75 g - x g (mass of NaCl) = 15.64 g

Solving for x, we get:

x = 260.75 g - 15.64 g = 245.11 g

So the mass of the solvent (water) is 245.11 g.

Now, we can calculate the concentration of the solution in units of grams of NaCl per milliliter of solution. We know that the mass of the solute is 15.64 g, and the volume of the solution is 250.0 mL, so:

Concentration = mass of NaCl / volume of solution

Concentration = 15.64 g / 250.0 mL

Concentration = 0.06256 g/mL

Finally, we can calculate the mass of the solute (NaCl) in the original solution, which is equal to the concentration times the volume of the solution:

Mass of NaCl = concentration x volume of solution

Mass of NaCl = 0.06256 g/mL x 250.0 mL

Mass of NaCl = 15.64 g

Therefore, the mass of the solute (NaCl) is 15.64 g.

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The solution with the lowest solubility of Zn(OH)2 is 1 M Zn(NO3)2 due to the presence of a high concentration of Zn2+ ions causing a common ion effect.

The solubility of Zn(OH)2 would be lowest in a solution with a high concentration of a common ion that can react with the Zn(OH)2 and shift the equilibrium towards the formation of the insoluble compound. Among the given options, the solution with the lowest solubility of Zn(OH)2 would be 1 M Zn(NO3)2.

When Zn(NO3)2 is dissolved in water, it dissociates to form Zn2+ and NO3- ions. The presence of a high concentration of Zn2+ ions in the solution creates a common ion effect, which reduces the solubility of Zn(OH)2. According to Le Chatelier's principle, the equilibrium is shifted in the direction that reduces the concentration of the common ion, in this case, Zn2+ ions. As a result, the solubility of Zn(OH)2 is decreased.

In contrast, solutions such as 1 M HCl, 1 M NaOH, pure water, and 1 M NH3 do not contain a high concentration of Zn2+ ions or any other common ions that can significantly affect the solubility of Zn(OH)2. Therefore, the solubility of Zn(OH)2 would be lowest in 1 M Zn(NO3)2 solution due to the common ion effect.

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An element is a basic object that is difficult to break down into smaller pieces/ malleable. As a result, choice D is right.

An element is a species of atoms with a specified number of protons in their nuclei, including the pure substance comprised completely of that species. Contrary to chemical compounds, chemical elements cannot be broken down into smaller molecules through any chemical process.

A substance that cannot be broken down by non-nuclear processes in physics and chemistry is called an element. In computers and mathematics, an element is a discrete part of a larger system or collection.

The three major divisions of the Periodic Table are metals, nonmetals, and metalloids. The components of each category have similar physical and chemical properties. Among the physical characteristics used to separate the three groups are, A substance's capacity to reflect light is referred to as luster.

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Answer:

Standard pressure is always 1.00atm. Example #1: How many moles of oxygen will occupy a volume of 2.50 L at STP? Standard temperature = 273K law.

Explanation:

Answer:

2.07 atm

Explanation:

Answer:

Earplugs

Explanation:

Because sound waves absorb most sound, the sound is coming from the earplugs which creates the most sound waves rather than water, tissue paper, and air.  Hope i helped :)

Answer:

Earplugs

Explanation:

Answer:

the answer would be to your problem here is 90g

Explanation:

When compared to the initial nuclide, the alpha decay product: The answer is B. The atomic number of the product is two less than the atomic number of the original nuclide.

What is Alpha Decay?

A nuclear process known as "alpha decay" causes the parent nucleus to emit an alpha particle. The alpha particle is made up of two neutrons and two protons. There is a radioactive decay process known as "alpha decay" in which an atomic nucleus produces an alpha particle and radioactively decays into a separate atomic nucleus with a mass number reduced by four and an atomic number reduced by two.

Alpha decay reduces atomic mass by 4 and atomic number by 2.

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The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of this buffer is  5.14. pH is a unitless quantity.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

0.18 M =NH₃

0.27 M= NH₄Cl.

Kb of NH₃ = 1.8 × 10⁻⁵

pKb = - log (kb)

      = - log (1.8 × 10⁻⁵)

       = 4.74

Using Henderson equation

pH = Pkb +ln [ NH₄Cl ]/ [NH₃]

    = 4.74 + ln (0.27 /0.18)

    = 5.14

Therefore, the pH of this buffer is 5.14.

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The sodium potassium pump helps in maintaining the acid-base balance of the body and helps in proper kidney function.

--> sodium ions,

--> potassium ions,

--> calcium ions and

--> some amino acids.

There are two types of active transport which are divided according to the energy that is used to cause the transport. They include:

--> primary and

--> secondary active transport.

PRIMARY ACTIVE TRANSPORT

A typical example is the SODIUM-POTASSIUM PUMP( Na+ - k+). This is a transport process that pumps sodium ions outward through the cell membrane of all cells and at the same time pumps potassium ions from the outside to the inside. This pump helps to:

--> maintain the sodium and potassium concentration differences across the cell membrane

--> establish a negative electrical voltage inside the cells.

The mechanism or operation of the pump involves the following steps:

--> two potassium ions bind on the outside of the carrier protein and three sodium ions bind on the inside.

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Answer: 100.0g

Explanation:

Answer: False

Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.

Answer:false

Explanation:it becomes a anion

Answer:

D

Explanation:

there are 5 electrons in the outer shell of the first picture

According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The frequency of an x-ray wave with an energy of 2×10^(-17) J in hertz is 3.01 × 10^(16) hz.

We can find the value of frequency of an x ray wave by using the relation between energy and frequency.

As we know that,

Energy is directly proportional to the frequency of the wave.

Mathematically,

E = h. f

Where,

E is the energy in joule

f is the frequency of the wave in hertz

h is the planck's constant

Given,

E = 2 × 10^(-17)J

h = 6.63 × 10^(-34) kg.m2/s

By substituting all the values, we get

2 × 10^(-17)J = 6.63 × 10^(-34) kg.m2/s × f

f = 2 × 10^(-17)J / 6.63 × 10^(-34) kg.m2/s

f = 3.01 × 10^(16) hz.

Thus, we concluded that the frequency of an x-ray wave with an energy of 2×10^(-17) J in hertz is 3.01 × 10^(16) hz.

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