Which of the following bonds has the greatest polarity?

P4
Br-Br
Te-F
CI-F

The total number of the electron pairs are eight electron pairs.

We know that the structure of a compound can be determined by the number of the electron pairs that are found on the valence shell of the central atom of the compound.

We know that the central atom must be the atom that is least electronegative. Given that there are four valence electrons of carbon which is the central atom in the compound, we have eight electron pairs  in the molecule. Thus the total number of valence electrons present is sixteen

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Answer:

3 fluorine atoms will be present

Answer:

3

Explanation:

The chemical formula of aluminum fluoride is AlF3. As you can see, there is a 1:3 ratio of aluminum atoms to fluorine atoms. Therefore, if a molecule of AlF3 has one aluminum atom, you know there must be 3 fluorine atoms present.

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Answer:

pH = 12.90

Explanation:

The TSP is in equilibrium with water as follows:

Na₃PO₄(aq) + H₂O(l) ⇄ Na₂HPO₄⁻Na⁺(aq) + OH⁻(aq)

Where Kb = 0.0208 is defined as:

Kb = 0.0208 = [Na₂HPO₄⁻Na⁺] [OH⁻] / [Na₃PO₄]

As both Na₂HPO₄⁻Na⁺ OH⁻ comes from the same equilibrium:

[Na₂HPO₄⁻Na⁺] = [OH⁻] = X

[Na₃PO₄] is -molar mass: 163.94g/mol:

50.0g * (1mol / 163.94g) =0.305moles / 1L =

0.305M

Replacing:

0.0208 = [X] [X] / [0.305M]

6.344x10⁻³ = X²

0.0796M = X = [OH⁻]

As pOH = -log [OH⁻]

pOH = 1.099

pH = 14 - pOH

Answer : The correct answer is option (3) \(5.68\times 10^{-19}J\)

Explanation: Given,

Wavelength =  350 nm = \(350\times 10^{-9}m\)         \((1nm=10^{-9}m)\)

Now we have to determine the energy of photon.

Formula used:

\(E=\frac{hc}{\lambda}\)

where,

E = energy  of photon

h = Planck's constant =  \(6.63\times 10^{-34}J.s\)

c = speed of light =  \(3\times 10^{8}m/s\)

\(\lambda\) = wavelength of photon

Now putting all the given values in this formula, we get:

\(E=\frac{(6.63\times 10^{-34}J.s)\times (3\times 10^{8}m/s)}{350\times 10^{-9}m}\)

\(E=5.68\times 10^{-19}J\)

Therefore, the energy of photon is, \(5.68\times 10^{-19}J\)

Answer:

It transports nutrients and waste in the body

It regulates body temperature

Explanation:

Water can be regarded as one of the basic substance needed by biological organism to survive, and for growth of vegetation. Biological process such as regulation of body temperature and transportation of nutrients into the body's blood for growth of different organisms is been aided by water.

Answer:

A, B, and D

Explanation:

The microstructure features exactly two components and two different phases in the given nanostructure. Therefore, the correct option is option B.

Within physical chemistry, engineering, mining, as well as materials science, a phase diagram is a specific kind of diagram that displays the parameters  at which thermodynamically different phases arise and coexist at equilibrium.

Lines of equilibrium, also known as phase boundaries, or circumstances under which different phases may coexist at equilibrium, are typical elements of a phase diagram. The microstructure features exactly two components and two different phases in the given nanostructure.

Therefore, the correct option is option B.

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If heat is going into the system, then energy must have come out from the surroundings.

If heat is entering a system, it means that the system is gaining thermal energy, which can lead to an increase in temperature, changes in state, or other effects depending on the nature of the system and the heat transfer mechanism.

The first law of thermodynamics, also known as the law of conservation of energy, states that the total amount of energy in a closed system remains constant, and energy can neither be created nor destroyed, only transferred or converted from one form to another.

When heat enters a system, it is either used to increase the internal energy of the system or to perform work, such as moving a piston or driving an electrical generator.

The amount of heat transferred to a system can be quantified using the equation Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is its specific heat capacity, and ΔT is the change in temperature.

Therefore, if the system is gaining energy in the form of heat, then the surroundings (the rest of the universe) must be losing that same amount of energy. This is because energy is conserved.

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Considering the ideal gas law, the volume occupied by 3.25 moles of an ideal gas at a temperature of 18.00°C is 686.71 L.

An ideal gas is the behavior of those gases whose molecules do not interact with each other and move randomly. Under normal conditions and under standard conditions, most gases exhibit ideal gas behavior.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T), related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the ideal gas law:

1.13 atm×V = 3.25 mol× 0.8205 L.atm/K.mol× 291 K

Solving:

V = (3.25 mol× 0.8205 L.atm/K.mol× 291 K)÷ 1.13 atm

V= 686.71 L

Finally, the volume is 686.71 L.

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Answer:

\(\Delta _rH=-1124.14kJ/mol\)

Explanation:

Hello!

In this case, since the standard enthalpy change for a chemical reaction is stood for the enthalpy of reaction, for the given reaction:

\(2H_2S(g) +3O_2(g)\rightarrow 2H_2O(l) +2SO_2(g)\)

We set up the enthalpy of reaction considering the enthalpy of formation of each species in the reaction at the specified phase and the stoichiometric coefficient:

\(\Delta _rH=2\Delta _fH_{H_2O,liq}+2\Delta _fH_{SO_2,gas}-2\Delta _fH_{H_2S,gas}-3\Delta _fH_{O_2,gas}\)

In such a way, by using the NIST database, we find that:

\(\Delta _fH_{H_2O, liq}=-285.83kJ/mol\\\\\Delta _fH_{SO_2, gas}=-296.84kJ/mol\\\\\Delta _fH_{O_2,gas}=0kJ/mol\\\\\Delta _fH_{H_2S,gas}=-20.50kJ/mol\)

Thus, we plug in the enthalpies of formation to obtain:

\(\Delta _rH=2(-285.73kJ/mol)+2(-296.84kJ/mol)-2(-20.50kJ/mol)-3(0kJ/mol)\\\\\Delta _rH=-1124.14kJ/mol\)

Best regards!

So, the mass of each metal in the 70.5 g mixture is: Magnesium: 39.1 g and Silver: 31.4 g.

A reaction, in chemistry, refers to a process in which one or more substances are transformed into new substances with different physical and/or chemical properties. Chemical reactions involve the breaking and forming of chemical bonds between atoms or molecules, resulting in the rearrangement of atoms to create new substances. In a chemical reaction, the reactants are the starting materials that undergo the chemical change, while the products are the substances that are formed as a result of the reaction. The chemical equation represents the reactants and products of a chemical reaction and is balanced to show the conservation of mass and the law of conservation of energy.

Here,

The balanced chemical equation for the reaction between magnesium and silver nitrate is:

Mg + 2AgNO3 → 2Ag + Mg(NO3)2

From the equation, we can see that 1 mole of magnesium reacts with 2 moles of silver nitrate to produce 2 moles of silver and 1 mole of magnesium nitrate.

First, we need to calculate how much silver was produced in the reaction. From the equation, we can see that 1 mole of magnesium produces 2 moles of silver, so:

1 mol Mg = 2 mol Ag

The molar mass of magnesium is 24.31 g/mol, so the number of moles of magnesium in the sample is:

=17.6 g Mg / 24.31 g/mol

= 0.724 mol Mg

Since 1 mole of magnesium produces 2 moles of silver, the number of moles of silver produced in the reaction is:

=0.724 mol Mg × 2 mol Ag / 1 mol Mg

= 1.448 mol Ag

The molar mass of silver is 107.87 g/mol, so the mass of silver produced in the reaction is:

=1.448 mol Ag × 107.87 g/mol

= 156.0 g Ag

Now, we can calculate the mass of magnesium that reacted in the reaction:

=17.6 g Mg × (156.0 g Ag / 70.5 g total metal)

= 39.1 g Mg

Therefore, the mass of silver in the 70.5 g mixture is:

=70.5 g total metal - 39.1 g Mg

= 31.4 g Ag

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Answer:

fluoride electrode was used to determine the amount of fluoride in drinking water samples. The results given in the table below were obtained for four standards and two unknowns. Constant ionic strength and pH conditions were used.

Solution Containing F-

Potential vs. SCE, mV

5.00 × 10-4 M

0.02

1.00 × 10-4 M

41.4

5.00 3 10-5 M

61.5

1.00 3 10-5 M

100.2

Unknown 1

38.9

Unknown 2

553

(a) Plot a calibration curve of potential versus log[F‑]. Determine whether the electrode system shows Nernstian response.

(b) Determine the concentration of F- in the two unknown samples by a linear least-squares procedure.

Explanation:

The data given is used in the following spreadsheet to plot the calibration curve

Calibration curve of electrode potential versus

Answer:

i) The size of X ion is greater than that of X atom even though both contain the same number of protons because the ion has fewer electrons compared to the atom. When an atom forms an anion (negative ion), it gains electrons, which causes increased electron-electron repulsion. This repulsion causes the electron cloud to expand, and as a result, the ion becomes larger than the neutral atom.

In the case of element X, when it forms an ion with a -3 charge, it will gain 3 more electrons, increasing the total number of electrons to 18. This will cause the size of the X ion to be larger than the neutral X atom.

ii) To determine the compound of X in the -3 oxidation state, we first need to determine the element's identity. We know that X has 15 electrons in total (2 in the K shell, 8 in the L shell, and 5 in the M shell). Therefore, X has an atomic number of 15, which corresponds to phosphorus (P).

Since phosphorus is in the -3 oxidation state, it gains 3 electrons and becomes P^3-. To form a compound, we need a cation that can balance the negative charge. A common example is aluminum (Al), which has a +3 charge (Al^3+). When phosphorus and aluminum combine, they form the compound aluminum phosphide with the formula AlP.

no. of moles in uncut diamond are 13.11 mol and number of Carbon atoms are 78.94 × 10^23.

The mass of a substance is given in this case. We are aware that the diamond is Carbon's allotrope.

weight of diamond before cutting = 787 carats

1 carat. = 0.200 gram

therefore, 787 carats. = 787 × 0.200

= 157.4 gram

To calculate the number of moles equation is

Number of moles =Mass / Molar mass

Molar mass of carbon Is 12g/mol

therefore, no. of moles = 157.4 / 12 = 13.11 mol

We know that 1 mol of any substance contains 6.022×10^23 atoms.

Here we have 13.11 mol of carbon. thus,

No. of Carbon atoms = 13.11 × (6.022×10^23 / 1 mol) = 78.94 × 10^23

Thus, 13.11 mol of diamond contain 78.94 × 10^23 number of Carbon atoms.

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Answer:

Explanation:

Here, we want to what the s stands for

In the equation of reaction, s represents the state of reaction of the reactant

We have that as solid state

Answer:

ethical and aesthetic services and direct services

Explanation:

I just took the test and it's NOT indirect services and direct services like the other person said. It's ethical and aesthetic services and direct services.

Answer:

Ok?

Explanation:

According to the problem Arrange the objects from smallest to largest is Pencil, Pillow, Basketball, House.

The smallest unit of measurement is the atom, which is the smallest particle of an element that still retains its chemical identity. Atoms are composed of even smaller particles, including protons, neutrons, and electrons. The size of an atom can vary depending on the element, but they typically measure between 0.1 and 0.5 nanometers in diameter.The smallest unit of measurement is the Planck Length, which is 1.616229 x 10-35 meters. This is the smallest measurement of length that is possible in the universe. It is also the smallest unit of measurement that has a meaning in physics.

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The mass, in kilograms, of aluminum sulfate required to produce 35.85 kilograms of lead (IV) sulfate would be 13.48 kilograms.

The equation of the reaction is as follows:

\(3Pb(CH_3COO)_2 + Al_2(SO_4)_3 -- > 3Pb(SO_4) + 2Al(CH_3COO)_3\)

Mole ratio of aluminum sulfate and lead (IV) sulfate = 1:3

Mole of 35.85 kilograms of lead (IV) sulfate = 35.85x1000/303.26 = 118.2154 moles.

Equivalent moles of aluminum sulfate = 118.2154/3 = 39.41 moles

Mass of 39.41 moles of aluminum sulfate = 39.41 x 342.15 = 13484 grams

13484 grams = 13484/1000 = 13.48 kg

In other words, the mass of aluminum sulfate required to produce 35.85 kilograms of leave (IV) sulfate is 13.48 kilograms.

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Answer:

Beta emission measn -1e0

Here reactant is phosphorus-32.

phosphorus-32 --- >    product + -1e^0

product = 16 S^32

P-32 beta decays to S-32. On the beta emission the product is formed which has same number of mass but the atomic number more than 1 of the reactant.

Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.

Answer:

Milk would be the only colloid

The sand and water, tomato juice and sugar and water are all known as suspensions (It consists of large particles mixed or suspended in a solution)

Explanation:

The substance which is an example of a colloid is: A. milk.

A mixture can be defined as a combination of two (2) or more substances which are present in varied proportion and can be visibly seen with na-ked eyes.

A colloid refers to a type of mixture in which substances are mixed together with their particles substantially larger than an ordinary molecule or atoms but too microscopic to be visibly seen with the eyes.

In conclusion, milk is a good example of a colloidal solution.

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Answer:

0.359 L or 359 mL of O2 gas will be produced from the given reaction at STP

Explanation:

The balanced chemical equation for the decomposition of KNO3 is:

2 KNO3 (s) → 2 KNO2 (s) + O2 (g)

From this equation, we can see that 2 moles of KNO3 produce 1 mole of O2. Therefore, we need to calculate the number of moles of KNO3 we have and use the mole ratio to find the number of moles of O2 produced.

First, we need to convert the mass of KNO3 given to moles:

moles of KNO3 = mass of KNO3 / molar mass of KNO3

The molar mass of KNO3 is 101.1 g/mol (39.1 g/mol for K, 14.0 g/mol for N, and 3 x 16.0 g/mol for 3 O atoms), so we have:

moles of KNO3 = 3.25 g / 101.1 g/mol = 0.0321 mol

Now we can use the mole ratio from the balanced equation to find the number of moles of O2 produced:

moles of O2 = 0.5 x moles of KNO3

moles of O2 = 0.5 x 0.0321 mol = 0.01605 mol

Finally, we can convert the number of moles of O2 to volume at STP using the ideal gas law:

V(O2) = n x RT/P = (0.01605 mol)(0.0821 L·atm/(mol·K) x 273.15 K)/(1 atm) = 0.359 L

Therefore, 0.359 L or 359 mL of O2 gas will be produced from the given reaction at STP.

The molecular formula of the compound is CI4H12S4.

Let's assume that we have 6 grams of the compound, which means that 1 gram of the compound contains 1/6th of the total amount of the compound.

We are given that the compound contains C, H, I, S, and has a molar mass of 229 g/mol. Let's use x, y, z, and w to represent the number of moles of C, H, I, and S in one mole of the compound, respectively.

From the information given in the problem, we can set up the following system of equations:

x + y + z + w = 1 (since the sum of the mole fractions must equal 1)

12x = y (since the compound has six times as much C as H by mass)

To find the molecular formula of the compound, we need to determine the values of x, y, z, and w that satisfy these equations and give a molar mass of 229 g/mol.

The molar mass of the compound can be calculated as:

M = 12x + y + 127z + 32w

Substituting y = 12x from the second equation, we get:

M = 13x + 127z + 32w

We know that the molar mass of the compound is 229 g/mol, so we can set up the equation:

229 = 13x + 127z + 32w

We also know that x + y + z + w = 1, so we can substitute y = 12x, giving:

x + 12x + z + w = 1

13x + z + w = 1

We can solve these equations simultaneously to get:

x = 0.061

z = 0.504

w = 0.069

Substituting these values into the equation for the molar mass, we get:

M = 13(0.061) + 127(0.504) + 32(0.069) = 229

Therefore, the molecular formula of the compound is CI4H12S4.

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The easiest way to determine the type of bonding that occurs between sodium and chlorine is to find the difference of their electronegativities.

Sodium has an electronegativity of 0.93 and chlorine an electronegativity of 3.16:

The difference of electronegativities is 2.23, which is greater than 1.7. It means that they form a ionic bond.

The resulting compound is what we know as table salt, which is NaCl, sodium chloride.

We expect that this compound is soluble in water.

Based on the reactants and products,

A precipitate is a solid product formed in when two solutions of salts react by double replacement.

The molecular equation of the reaction of Al(NO3)3 solution with a KOH solution is:

Al(NO3)3 + 3 KOH ---> Al(OH)3 + NaNO3

The complete ionic equation of the reaction of Al(NO3)3 solution with a KOH solution is:

Al3+ 3NO3- + 3 K+ 3OH- ---> Al(OH)3(s) + 3 Na+ 3 NO3+

The net ionic equation of the reaction of Al(NO3)3 solution with a KOH solution is:

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Hydrophosphoric acid is generally known as phosphine and the formula for hydrophosphoric acid is PH3 P H 3

Hypophosphoric acid is a mineral acid with phosphorus in an oxidation state +4.It has a chemical formula H4P2O6.

Hypophosphorous acid is used as a decolorizing agent and for color stabilization during the manufacture of chemicals and several plastics including: nylon fibers, polyamides, polyester fiber, polyacrilonitrile, alkyd rsins, epoxies, fatty acid esters and glycerols.

Therefore, the formula of hypophosphoric acid is H4P2O6. It contains four P-OH bonds, Two P=O. bonds and one P-P bond.

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