why does an atom with a high effective nuclear charge readily attract an electron from another atom to valence shell

Explanation:

I Would Determine Mass,Volume And Weight

Appropriate benefit of dietary fiber intake to its associated disease.- c. Decreases intestinal transit time and exposure to potential toxins

Cardiovascular diseases (CVDs) are the most common cause of death worldwide, claiming the lives of an estimated 17.9 million persons each year. CVDs are a group of heart and blood disorders that include coronary artery disease, vascular disease, rheumatic fever, and others. Coronary heart disease could be cured, but treatment can help manage the symptoms and lower the risk of conditions such as heart attacks. Treatment may include changes in lifestyle, such as physical activity and quitting smoking. The most common symptom of heart disease is heart disease (CHD), which kills approximately 382,820 people every year. Every year, approximately 805,000 Americans suffer a heart attack.

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Answer:

D

Explanation:

its just right

Answer:Reactants combine to form Products. Hope this helped! ;)

Explanation:

The mass of the solid is  2733 g

The mole is a useful unit of measurement in chemistry because it allows scientists to easily compare the amounts of different substances in chemical reactions. By knowing the molar amounts of the reactants and products in a chemical reaction, scientists can calculate important information such as the mass of products formed, the amount of energy released or absorbed, and other key chemical properties.

We know that;

1 mole of the compound would contain 6.02 * 10^23 molecules

x moles of the compound will contain  9.62 x 10^24 molecules

x= 15.98 moles

Then;

Mass = 15.98 moles * 171 g/mol

= 2733 g

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Answer:

151.87dm³

Explanation:

Given parameters:

Volume of hydrogen gas  = 6.78mole

Unknown:

Volume of hydrogen gas formed at STP  = ?

Solution:

To solve this problem;

   1 mole of a gas at STP  = 22.4dm³ So;

   6.78 mole of gas  = 6.78 x 22.4  = 151.87dm³

The rate constant of a first-order reaction that takes 555 seconds for the reactant concentration to drop to half of its initial value is 1.2 x 10^-3 sec^-1.

A first-order reaction refers to a chemical reaction in which the rate of reaction is proportional to the concentration of the reactant. In other words, doubling the reactant concentration doubles the reaction rate.

The time taken that is taken for original population of radioactive atoms to decay to half of initial value is called the half-life. The half-life of a first-order reaction is a constant that is related to the rate constant (k) for the reaction given by: t1/2 = 0.693/k. Radioactive decay reactions are first-order reactions.

According to the provided information, t1/2 = 555 seconds

Hence,

555 = 0.693/k

k = 0.693/555 = 0.0012486 = 1.2 x 10^-3 sec^-1

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Answer:

See answer below

Explanation:

AS we know that the valence for those metals X, Y, and Z are 1, 2 and 3, we can determine the formula of each compound.

1. Hydroxides.

An hydroxide is formed when an oxyde of a metal reacts with water. When this happens, the general molecular formula is:

Meₐ(OH)ₙ

Where:

a: valence or charge of the hydroxide (Which is -1)

n: valence of the metal.

Following this, the formula for X, Y and Z would be:

XOH

Y(OH)₂

Z(OH)₃

2. Sulphates

Sulphates follow a similar rule of hydroxide in the general molecular formula, but instead of having a charge of -1, it has a charge of -2 so:

Mₐ(SO₄)ₙ

So, following the rule:

X₂SO₄

Y₂(SO₄)₂ ------> YSO₄

Z₂(SO₄)₃

3. Hydrogens

Following the same rule as the previous, hydrogens works with a charge of -1, so:

MₐHₙ

Then:

XH

YH₂

ZH₃

4. Carbonates.

This follows the same rule as sulphates, with the same charge so:

Mₐ(CO₃)ₙ

Then:

X₂CO₃

YCO₃

Z₂(CO₃)₃

5. Nitrates

Follow the same rule as the hydroxides, with the same charge of -1.

Mₐ(NO₃)ₙ

Then:

XNO₃

Y(NO₃)₂

Z(NO₃)₂

6. Phosphates

In the case of phosphates, these have a charge of -3 so:

Mₐ(PO₄)ₙ

Then:

X₃PO₄

Y₃(PO₄)₂

Z₃(PO₄)₃ ----> ZPO₄

Hope this helps

Answer:

yes

Explanation:gergrgregbfbwerbebw

Learn the concentration and beginning rate in order to determine the correct number of significant digits. The starting rate of reaction is 98.0 m/s at a specific concentration of h2 and i2.

What, using an example, is concentration?

1) Percent Concentration:

The amount of solute that completely dissolves in 100 g of solvent. We know that there are 20 g of solute in 100 g of solution if the solution's concentration is 20 percent. Example: The solution is made by combining 10 g of salt with 70 g of water. Find the solution's concentration using mass percent.

What would you say about concentration?

The amount of solute contained in a specific amount of solution is the substance's concentration. Typically, concentrations are described in terms of molarity, which is the number of

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The ph of a solution obtained by dissolving two extra-strength aspirin tablets of mass 470 mg of acetylsalicylic acid is 2.58.

Each tablet has a mass of 470 mg. The mass of 2 tablets is 2 × 470 mg = 940 mg = 0.940 g

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Based on the thermodynamic properties provided for water, the energy change when the temperature of 0.650 kg of water decreased from 101 °c to 51.0 °c is 1,609.66 kJ

What are thermodynamic properties of water?

Thermal characteristics of water include its density, freezing point, boiling point, latent heat of evaporation, melting point, and critical temperature, among others.

Here we calculate the boiling point of water is 100°C. So at 101°C, the water is steam. The specific heat first from 101 to 100 calculated as

E = mCΔT, where c for steam is 1.996 kJ/kg·°C

E₁ = (0.65 kg)(1.996 kJ/kg·°C)(101 - 100°C) = 1.2974 kJ

The latent heat when steam turns to liquid. The heat of vaporization of water is 2260 kJ/kg.

E₂ = mHvap = (0.65 kg)(2260 kJ/kg) = 1469 kJ

Thus solving  the energy to bring down the temperature to 51°C. The specific heat of liquid water is 4.187 kJ/kg·°C.

E₃ = (0.65 kg)(4.187 kJ/kg·°C)(100 - 51°C) = 139.36 kJ

Total energy = 1.2974 kJ+1469 kJ+139.36 kJ = 1,609.66 kJ

Therefore , the energy change when the temperature of 0.650 kg of water decreased from 101 °c to 51.0 °c is 1,609.66 kJ

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Answer:

Simple covalent molecules have low melting points because their weak intermolecular forces cause the bonds to break easily, leading to a low temperature required to change the solid to a liquid. In contrast, diamonds, which are made up of a large network of strong covalent bonds, require a high amount of energy to break these bonds and cause the transition from solid to liquid, resulting in a high melting point.

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The vital capacity will be 4600ml.

The highest amount of air a person can inhale following their maximal exhalation is known as their vital capacity. It is equivalent to the total of the inspiratory, tidal, and expiratory reserve volumes. It roughly corresponds to Forced Vital Capacity. A wet or conventional spirometer can assess a person's vital capacity.

Normal people have a 3 to 5-liter vital capacity.

It enables simultaneous inhalation of the greatest possible volume of clean air and exhalation of the greatest possible volume of stale air. So, by increasing gaseous exchange between the body's various tissues, it improves the amount of energy available for bodily function.

VC = TV₊IRV₊ERV

where,

VC = Vital capacity

TV = Tidal volume

IRV = inspiratory reserve volume

ERV = expiratory reserve volume

VC = 500 ₊ 3000 ₊ 1100

VC = 4600ml

Therefore, the vital capacity will be 4600ml.

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1.22 grams of water has 5.0 x10^22 H2O water molecules.

A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds. There is no guarantee that the term will include ions that meet this criterion, depending on the context.

Calculate the number of moles of water = mass / molar mass of water

Moles = 1.2 g/ 18 g/mol = 0.083 mol H2O

1 mole of any substance = 6.02 x 10^23 H2O molecules (Avogadro's number)

Resolution:

Molecules = 0.083 moles (6.02 x 10^23 H2O molecules/mole)

= 0.5 x 10^23 or 5.0 x10^22 H2O molecules

answer:

Number of molecules = 5.0 x 10^22 H2O molecules  

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The substance with chlorine in the lowest oxidation state is b. KCl, where chlorine has an oxidation state of -1.

The oxidation state of an element indicates the charge it would have in a compound or ion if electrons were completely transferred.

a. In Cl₂, each chlorine atom shares electrons equally, resulting in a neutral chlorine molecule. The oxidation state of each chlorine atom in Cl₂ is 0.

b. In KCl, potassium (K) is a Group 1 element with an oxidation state of +1. Chlorine (Cl) has an oxidation state of -1 to balance the charge. This is the lowest oxidation state of chlorine among the given options.

c. In KClO, potassium (K) has an oxidation state of +1, and oxygen (O) usually has an oxidation state of -2. We can assign chlorine (Cl) an oxidation state of +1 to balance the charges. Therefore, chlorine in KClO has an oxidation state of +1.

d. In KClO₄, potassium (K) has an oxidation state of +1, and oxygen (O) usually has an oxidation state of -2. To balance the charges, chlorine (Cl) must have an oxidation state of +7. Therefore, chlorine in KClO₄ has an oxidation state of +7.

Based on the given options, the substance with chlorine in the lowest oxidation state is b. KCl, where chlorine has an oxidation state of -1.

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Answer:

it is a nice question....my mind tells me that the first is it use me as a good vibes and can use to anything the second i will do my best too absorbe it.

Explanation:

Hope this help...

Answer:

a. 25.5 moles of Pb will be formed.

b. 54.8 moles of PbO are needed.

c. PbS is the limiting reactant.

Explanation:

1st) It is necessary to write the balanced chemical reaction:

From the balanced chemical reaction we know that 1 mole of PbS reacts with 2 moles of PbO to produce three moles of Pb and 1 mole of SO2.

2nd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of Pb that will be produced from 17 moles of PbO and excess of PbS:

So, 25.5 moles of Pb will be formed.

3rd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of PbO that are needed to make 27.4 moles of SO2 in excess of PbS:

So, 54.8 moles of PbO are needed.

4th) Using the stoichiometry of the reaction we can calculate the limiting reactant:

- Calculation from 17.6 moles of PbS:

From the stoichiometry of the reaction 1 mol of PbS reacts with 2 moles of PbO, so the 17.6 moles of PbS will need 35.2 moles of PbO to react properly, but we have 36g of PbO, so PbO will be the excess reactant and PbS the limiting reactant.

- Calculation from 36 moles of PbO:

We can do this calculation to confirm the previous one:

In this case, we can see that 36 moles of PbO will need 18 moles of PbS to react properly, but we only have 17.6 moles of PbS. Here we confirm that PbS is the limiting reactant.

1.  3.50 moles of MgCl2 are known.

Unknown: HCl moles needed.

According to the equilibrium equation, 2 moles of HCl are converted into 1 mole of MgCl2.

Therefore, to make 3.50 moles of MgCl2, we need:

(7.00 mol HCl) = (3.50 mol MgCl2) (2 mol HCl / 1 mol MgCl2)

Hence, 3.50 moles of MgCl2 can be prepared from 7.00 moles of HCl.

2. The Pb content is known at 50 g. milligram content is unknown.

According to the balanced equation, 1 mole of Mg gives 1 mole of Pb.

To determine the moles of lead:

The mass of Pb / molar mass of Pb is equal to moles of Pb.

The molar mass of Pb is 207.2 g/mol.

Moles of Pb = 50 g Pb / 207.2 g/mol Pb

From the balanced equation, the stoichiometry is 1:1 between Mg and Pb.

Hence, the moles of Mg required will be equal to the moles of Pb.

Grams of Mg required = Moles of Mg × Molar mass of Mg

3. 2.0 moles of Fe2O3 are known.

Unknown: Required O2 grams

According to the balanced equation, 3 moles of oxygen are converted into 1 mole of Fe2O3.

Therefore, to make 2.0 moles of Fe2O3, the following would be required:

6.0 mol O2 (2.0 mol Fe2O3) is equal to (3 mol O2) / 1 mol Fe2O3.

grams of oxygen required = moles of oxygen + molar mass

4. 25.0 g of Fe are known.

Unknown: FeCl3 production in grams

According to the balanced equation, 2 moles of Fe are converted into 2 moles of FeCl3.

To determine the moles of iron:

equals the mass of Fe divided by its molar mass.

The molar mass of Fe is 55.8 g/mol.

Fe moles are equal to 25.0 g Fe and 55.8 g/mol Fe.

The balanced equation shows that the stoichiometry between Fe and FeCl3 is 2:2.

As a result, the amount of FeCl3 formed will be equal to the amount of Fe.

moles of FeCl3 formed grams equal to molar mass of FeCl3

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An element can have multiple isotopes. Isotopes correspond to variations of the same element with respect to the number of neutrons in its nucleus. the number they give us, 35 and 37 correspond to the mass number of chlorine. The percentage will be how abundant the element is.

To find the average atomic mass we must multiply the mass of the isotope by its respective percentage of abundance and add these two results.

So, the average atomic mass of Cl will be:

Answer: the average atomic mass of chlorine is 35.454 amu

Answer: A is the correct answer

Explanation:  It conducts more electricity than almost all other metals ans gems in jewelry

The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Answer:B

Explanation:

The summary which expresses the main points of the Gravitational force best is the second one.

Gravitational force is a attraction force which is present between two objects and represented as:

F = gm₁m₂ / r², where

g = gravitational constant

m₁ = mass of one object

m₂ = mass of another object

r = distance between two objects

Because of gravity all objects will have a accurate position and particular order.

Hence second paragraph expresses best.

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All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.

Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.

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Answer: B3N3H6

Explanation:

I am pretty sure the formula for benzene is B3N3H6. If I am wrong, I am sorry, I learned this a long time ago.

when 0.367 mol of a weak acid, hx, is dissolved in 2.00 l of aqueous solution, the ph of the resultant solution is 2.60. ka for hx is 3.405 × \(10^{-5}\)

Number of moles = 0.367

Volume of solution = 2l

concentration = 0.367/2 = 0.1835 mol/L

ph = 2.60

we know

ph = - log [H+]

2.51 × \(10^{-2.60}\)M = [H+]

The acid HX dissociate as

HX → H+   +  X-

The acid dissociation constant Ka, for the dissociation reaction is

Ka = [H+][X-]/[HX] ; at equilibrium, [H+] = [X-]

Ka = 3.405 × \(10^{-5}\)

A solution in which water serves as the solvent is called an aqueous solution. The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na+(aq) + Cl The word aqueous, which derives from the word aqua, means that something is connected to, resembles, or is dissolved in water. Water is a common solvent in chemistry because it is an excellent solvent and abundant in nature. Since water is frequently used as the experiment's solvent, unless otherwise stated, the term "solution" refers to an aqueous solution.

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Glyceryl tributyrate will react with 3 mol of water and form a glycerol and 3 mol of carboxylic acid.

Answer:

the limiting reactant is aluminum

Explanation:

Answer:

V = 20.1 L

Explanation:

Given data:

Volume of flask = ?

Number of moles of nitrogen gas = 0.730 mol

Pressure = 698 mmHg (698/760 = 0.92 atm)

Temperature = 35.4°C

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

35.4+273 = 308.4 K

by putting values,

0.92 atm× V = 0.730 mol ×0.0821 atm.L/ mol.K × 308.4 K

V = 18.48 atm.L / 0.92 atm

V = 20.1 L