how many total valence electrons are present in a molecule of p c l 3 ?

Answer:

\(c=5.14\ J/kg ^{\circ} C\)

Explanation:

Given that,

Heat absorbed by a sample, Q = 228 J

Mass of a sample, m = 706 g = 0.706 kg

Initial temperature is 26 °C and final temperature is 88.8°C

We need to find the heat absorbed by the sample. The heat absorbed by an object is given by :

\(Q=mc\Delta T\\\\\text{Where c is specific heat of sample}\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{228\ J}{0.706\ kg(88.8-26)^{\circ} C}\\\\c=5.14\ J/kg ^{\circ} C\)

So, the specific heat of the sample is \(5.14\ J/kg ^{\circ} C\).

We would need about 30 grams

Solubility is the ability of a substance, called the solute, to dissolve in a solvent to form a homogeneous mixture called a solution. The solubility of a substance is typically expressed as the maximum amount of the solute that can dissolve in a given amount of the solvent at a specified temperature and pressure.

The solubility of KCl at 80 degrees Celsius is 50g/100gH2O

As such we would need about 30 grams

Solubility is an important concept in many fields of science, including chemistry, biochemistry, and environmental science.

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The radiant energy that is absorbed by the plant in the process of photosynthesis is stored in the plant in the form of chemical energy contained in sugars.

The term photosynthesis has to do with the process by which there is a combination of water and carbon dioxide in the plant such that the products that are formed are sugar and oxygen. The oxygen is released back into the environment.

We know that radiant energy from the sun is what acts as the catalyst that makes the reaction possible. The combination occurs in the chloroplasts of the plant cells .

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For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced. H₂S 2NAOH is the highlighted atom being reduced in the given chemical reaction is sulfur (S), while the highlighted atom being oxidized is hydrogen (H).

H₂S + 2NaOH → 2H₂O + Na₂S, is the chemical equation provided in the table above. The reaction between hydrogen sulfide and sodium hydroxide is a redox reaction. A redox reaction is a reaction that involves a transfer of electrons between two species. The oxidation state of sulfur (S) changes from -2 to 0; thus, the sulfur (S) atom is reduced in this reaction. Sodium's (Na) oxidation state changes from +1 to 0, indicating that it has been reduced.

The hydrogen's (H) oxidation state has not changed; it remains +1, indicating that it is neither oxidized nor reduced. The hydrogen sulfide's (H₂S) oxidation state changes from -2 to 0, indicating that it has been oxidized. The sodium hydroxide's (NaOH) oxidation state changes from +1 to -1, indicating that it has been oxidized as well. Hence, the highlighted atom being reduced in the given chemical reaction is sulfur (S), while the highlighted atom being oxidized is hydrogen (H).

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Answer: Energy can be classified as one of these types potential energy, kinetic energy, and chemical energy

A number of electrical devices operate on the basis of law of conservation of energy. Energy can be changed from gas form to other. In a torch it is the chemical energy which is converted into heat and light energy. The correct option is B.

The law of conservation of energy states that the energy can neither be created nor be destroyed. Although it can be transformed from one form to another. The total energy of an isolated system always remains constant. All forms of energy follow the law of conservation of energy.

In a closed system which is defined as a system that is isolated from its surroundings, the total energy of the system is conserved. So in an isolated system like universe, if there is a loss of energy then there must be a gain of an equal amount of energy.

Although this principle cannot be proved.

Thus the correct option is B.

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Answer:

First 20 Elements

Atomic Number Element Symbol

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

Answer:

Environmental limitations.

Explanation:

Among the given options, C2H6 is the least soluble in water.The answer is option A. Ethane (C2H6) is a nonpolar hydrocarbon composed of two carbon atoms and six hydrogen atoms. Because water molecules are polar, they interact only with polar molecules or ions, not nonpolar ones.

As a result, Ethane (C2H6) lacks polar functional groups like OH, NH2, and COOH, and it is therefore nonpolar. It has no permanent dipole moment as a result of the symmetrical arrangement of the C-H bonds in a tetrahedral geometry, and it is only able to interact with water molecules via Van der Waal forces or London Dispersion Forces. Because water is a polar solvent, nonpolar compounds like C2H6 are poorly soluble in water. Therefore, among the given options, C2H6 is the least soluble in water.In summary, the answer is C2H6. The answer is option A

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The 149.2 grams of potassium chloride would be produced if 78 grams of potassium and 71 grams of chlorine completely reacted.

The balanced chemical equation for the reaction between potassium metal (K) and chlorine gas (Cl₂) to form solid potassium chloride (KCl) is:

2K(s) + Cl₂(g) → 2KCl(s)

This equation indicates that two atoms of potassium react with one molecule of chlorine gas to yield two molecules of potassium chloride.

The type of reaction is a combination reaction, also known as a synthesis reaction. In this type of reaction, two or more substances combine to form a single product.

To determine the mass of potassium chloride produced, we need to calculate the limiting reactant. The molar mass of potassium is approximately 39.1 g/mol, and the molar mass of chlorine is approximately 35.5 g/mol.

First, we convert the given masses of potassium (78 g) and chlorine (71 g) into moles by dividing them by their respective molar masses:

Moles of potassium = 78 g / 39.1 g/mol = 2 mol

Moles of chlorine = 71 g / 35.5 g/mol ≈ 2 mol

Since the reactants have a 1:1 stoichiometric ratio, it can be seen that both potassium and chlorine are present in the same amount. Therefore, the limiting reactant is either potassium or chlorine.

Assuming potassium is the limiting reactant, we can calculate the mass of potassium chloride produced. Since 2 moles of potassium react to form 2 moles of potassium chloride, we can use the molar mass of potassium chloride (74.6 g/mol) to calculate the mass:

Mass of potassium chloride = 2 mol × 74.6 g/mol = 149.2 g

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The compound H₂S should be classified as a molecular compound.

Molecular compounds are formed by the combination of nonmetals or a combination of nonmetals and metalloids. They are held together by covalent bonds, where atoms share electrons to form molecules.

Looking at the options provided:

i. H₂S represents the compound hydrogen sulfide. It consists of two hydrogen atoms bonded to a sulfur atom. Both hydrogen and sulfur are nonmetals. Therefore, H₂S is a molecular compound.

ii. Br₂ represents the compound bromine. It consists of two bromine atoms bonded together. Bromine is a nonmetal, so br₂ is also a molecular compound.

iii. CAO represents the compound calcium oxide. It consists of a calcium atom bonded to an oxygen atom. Calcium is a metal, while oxygen is a nonmetal. Compounds formed between metals and nonmetals are classified as ionic compounds, not molecular compounds.

In conclusion, among the options provided, H₂S and Br₂ should be classified as molecular compounds since they consist of nonmetals bonded together. Cao, on the other hand, should be classified as an ionic compound since it is formed between a metal and a nonmetal.

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In an ecosystem, plant tropism represented is phototropism  which is towards the direction of light.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The molar mass of calcium phosphate, when rounded to the closest tenth, is 310.18 g/mol.

To calculate the molar mass of calcium phosphate (Ca3(PO4)2), we need to add the atomic masses of each of the atoms in one mole of the compound.

The atomic masses are:

Ca (calcium): 40.08 g/mol

P (phosphorus): 30.97 g/mol

O (oxygen): 16.00 g/mol

There are three calcium atoms and two phosphate groups in one mole of calcium phosphate. Therefore, the molar mass is:

(3 x 40.08 g/mol) + (2 x (2 x 30.97 g/mol + 8 x 16.00 g/mol))

= 120.24 g/mol + 2 x (61.94 g/mol + 128.00 g/mol)

= 310.18 g/mol

Rounding to the nearest hundredth gives a molar mass of calcium phosphate of 310.18 g/mol.

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Answer:

A. Oxidation-reduction

Explanation:

I assume you mean the reaction is:

Ag2NO3(aq) + Cu(s) -> 2Ag(s) + Cu(NO3)2(aq)

Either way:

Solids have the oxidation number of 0. So in the beginning of the reaction Cu(s) has the oxidation number 0, and at the end it has a oxidation number of +2. So it was oxidized.

Ag in the beginning of the reaction has the oxidation number of +1, and ends with the oxidation number of 0. It was reduced.

So its an oxidation reduction.

Answer:

This is thermodynamics.

Using simple thermodynamics operation equation

Answer:

The star's apparent motion is called stellar parallax. There is a simple relationship between a star's distance and its parallax angle: d = 1/p. The distance d is measured in parsecs and the parallax angle p is measured in arcsecond.

The number of moles of hydrogen is equal to the number of moles of nitrogen.

According to the ideal gas equation

PV = nRT

where

In the problems there are two identical cylinders means, V₁ = V₂

The pressure inside each of two identical cylinders is equal to atmospheric pressure means, P₁ = P₂

Both gases are at the same temperature, means T₁ = T₂

\(\frac{P_1 V_1}{P_2 V_2} \:=\: \frac{n_1 RT_1}{n_2 RT_2}\)

\(\frac{P_1 V_1}{P_2 V_2} \:=\: \frac{n_1 T_1}{n_2 T_2}\)

n₁ = n₂

So the total amount of hydrogen gas is equal to total amount of ideal nitrogen gas.

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Answer:

(D) is the correct option.

Explanation:

Molar mass of NO = (14+16) g/mol = 30 g/mol

Molar mass of NO₂ = (14+16×2) g/mol = 46 g/mol

Molar mass of N₂O = (14×2+16) g/mol = 44 g/mol

Molar mass of N₂O₅ = (14×2+16×5) g/mol = 108 g/mol

Number of moles = mass/molar mass

mass = n × M, M = molar mass

n = 1 mol in each case

Higher the molar mass, greater is the mass of the compound. The molar mass of N₂O₅ is greatest of all other cases. It will have greatest mass.

It is true that electromagnetic waves can travel in empty space or space that has no particles.

The correct option is True.

Waves of the electromagnetic field make up electromagnetic radiation; they travel through space while carrying momentum and radiant energy. It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves.

Electromagnetic waves include radio waves, television waves, and microwaves. The only thing separating them is the wavelength. The wavelength is the distance between each wave's peak and the next.

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Answer:

paper plate

Explanation:

A renuable source is a source that would replenish in ones lifetime. Trees make paper and grow in the span of a average human life.

The vitamin A concentration in the sample is 0.000138 mol/L.

The vitamin A concentration in a sample whose absorbance at 325 nm is 0.735 in a cell with a pathlength of 1.00 cm can be calculated using the Beer-Lambert Law. The Beer-Lambert Law states that the absorbance of a solution is directly proportional to the concentration of the absorbing species in the solution and the path length.

The equation for the Beer-Lambert Law is: A = εlc

where A is the absorbance, ε is the molar absorptivity, l is the path length, and c is the concentration. We can rearrange the equation to solve for the concentration:

c = A / (εl)

We are given the absorbance (A = 0.735), the path length (l = 1.00 cm), and the molar absorptivity (ε = 5,325) at the maximum wavelength (λmax = 325 nm). Plugging these values into the equation, we get:.

c = 0.735 / (5,325 x 1.00)

c = 0.000138 mol/L

Therefore, the vitamin A concentration in the sample is 0.000138 mol/L.

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Answer:

The noble gases(neon, helium, argon)

Explanation:

In the ground state, noble gas atom has a completely filled valence electron shell. Space makes up the majority of an atom.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense. In the ground state, noble gas atom has a completely filled valence electron shell.

Therefore, in the ground state, noble gas atom has a completely filled valence electron shell.

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Answer:

i think its solar radiation

The total mass of the product will be 137 grams.

From the equation of the reaction:

\(Zn + 2HCl --- > ZnCl_2 + H_2\)

Mole of 130 grams of Zn = 130/65 = 2 moles

Equivalent mole of \(ZnCl_2\) = 1 mole = 1 x135 = 135 grams

Equivalent mole of \(H_2\) = 1 mole = 1 x 2 = 2 grams

Total mass of the products = 135 + 2 = 137 grams.

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The answer is (D) MgBr2 < BrF5 < SbCI5 < NH3 with the compounds listed in order of increasing boiling point

D) MgBr2 < BrF5 < SbCI5 < NH3

This ordering is consistent with the strengths of intermolecular forces in each compound. MgBr2 has the highest boiling point due to its strong ionic bonds, followed by BrF5 with its strong dipole-dipole interactions. SbCI5 has weaker dipole-dipole interactions than BrF5, so it has a lower boiling point. NH3 has the weakest intermolecular forces of all the compounds listed, so it has the lowest boiling point.

The boiling point of a compound is primarily determined by the strength of its intermolecular forces. Compounds with stronger intermolecular forces will have higher boiling points, while compounds with weaker intermolecular forces will have lower boiling points.

Therefore, the correct answer is (D) MgBr2 < BrF5 < SbCI5 < NH3.

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The density of silver at room temperature is 10.49 g/cm3, and the density of silver at its melting point is 9.3 g/cm3 when solid silver melts, its particles 'move farther apart'

From the given data density of silver at room temperature is 10.49 g/cm3, and the density of silver at its melting point is 9.3 g/cm3 then solid melts, liquid state is obtained and intermolecular distance in liquid is more than the intermolecular distance in solid due to this, the strength of intermolecular forces of attraction decreases when silver solid melt then its particles move farther apart and that's why the solid silver which is at room temperature density is more because it is in room temperature but we melt then particles are move faster and move apart from other and density become less.

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Answer:

22.414 \(dm^{3}\) at S.T.P  and 24 \(dm^{3}\)

Explanation:

Volume of one mole of gas at standard temperature and pressure, stp, (0 °C, 1 atm) is 22.4 dm3. At room temperature and average pressure, rtp, the volume of any gas is approximately 24 dm3.

Answer:

the partial pressure of bromine gas is 0.186 atm

Explanation:

a. The population in the case of a chemical process being run 15 times and yield being measured each time is the population of yields. The population is conceptual as it is a hypothetical group of yield values that could potentially be observed or measured but cannot be physically touched or grasped.

b. The population in the case of a pollster sampling 1000 registered voters in a certain state and asking them which candidate they support for governor is the population of registered voters in that state. This population is tangible as it consists of actual individuals who can be physically located and contacted.

Sampling is the process of choosing a representative subset of a population for the purpose of generalizing findings about the population. In both of the above cases, sampling is used to infer about the population. Random sampling is the most common method used to select samples that are representative of the population. It is important to note that the accuracy of the sample is largely dependent on the sampling method employed, sample size, and the representativeness of the sample. In practice, a larger sample size provides a more accurate estimate of the population parameters.

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Answer:

39.0

Explanation: