How many moles of ca(oh)2 are required to react with 1. 36 mol of h3po4 to produce ca3(po4)2 according to the equation.

Cations have more protons than electrons, Anions result when atoms gain an electron.

The electron, a subatomic particle, has a negative one elementary charge electric charge. The electron, a member of the first generation of the lepton particle family, is usually regarded as an elementary particle because it has no known components or substructure.

A few straightforward rules can be used to calculate the quantity of protons, neutrons, and electrons present in an atom. The atomic number and the number of protons in the atom's nucleus are equal (Z). A neutral atom has the same number of protons and electrons as protons.

Around the nucleus, electrons are positioned in several shells. Only a fixed amount of electrons can fit in each subsequent shell. Filling begins with the innermost shell.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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The property of acids which would cause acid rain to damage buildings over time is:

Acids react with limestone.

The correct answer choice is option c.

This simply means that acids has this property which corrodes the surface they come in contact with especially stones.

However, this can be done by coating the surface of metals, or carbonate by coating it with other metals. By so doing, this can prevent acid rain damage to it.

That being said, by default, concentrated acids are highly corrosive.

Coating surfaces of metals can prevent acid rain damage to it

This refers to a substance which when dissolved in water, it produces hydrogen ion as the only positive ion in the solution.

So therefore, the property of acids which would cause acid rain to damage buildings over time is acids react with limestone.

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Answer:

C and D

Explanation:

A is false because the warmer the current is, the more likely the moisture is to become airborne.

B is false because if the currents were absorbing thermal energy from the air above them, they would actually start to heat up rather than cool.

Oxygen Consider the following improper equation: O2 → CO2 + Oxygen ( o2 + C6H14 How much carbon dioxide (CO2) could be created by combining 11.2 g of C6H14 with 37.9 g of extra oxygen.

Carbonic acid, or H2CO3, is created when CO2 and water combine. This acid is in mixture with co2 (HCO3-) and h+ (H+). The following phase of the reaction is influenced by changes in the concentrations of reactants on either of the equation's sides.

Billion British thermal unit (MMBtu) are converted to therms, and then the carbon coefficient, the fraction oxidized, and the proportion of the molecular mass of atmospheric co2 to carbon  are multiplied to get the greenhouse gas emissions per therm.

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Answer:

it's volume also decrease

Answer: Answer

Iron is a chemical element with symbol Fe and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in front of oxygen, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust.

Explanation:

Hope this helps!

Answer:

iron:

group 8

4 orbitals

electrons per shell:2,8,14,2

26 electrons

8 valence electrons.

Explanation:

iron is in the 8th group in the periodic table because it is a transition metal and their valence shells have 8 electrons.

It has 4 electron shells because the first one can hold two electrons, the second has 8 and so on.

The total number of electrons is 26, which is equal to number of protons.

Valence electrons are in the outermost shell.

Answer:

Constant

Explanation:

Trust

Answer:

Sodium

Explanation:

Radius grows as you go down and to the right on the ptable.

Answer: Proteins are known as biomolecules and biomolecules are made of the elements Carbon, Hydrogen, Nitrogen, and Oxygen and the monomers of proteins are known as amino acids.

Answer:

tertiary

Explanation:

tertiary halogenoalkanes are more reactive than primary and secondary as the carbocation is more stable due to alkyl groups( have high electron density) donating electrons to stabilise the carbocation

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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The volume of the irregular solid from the image that have been shown is  12 mL

To obtain the volume of the irregular solid;

a. Measure the initial volume of water in the cylinder.

b. Carefully lower the irregular solid into the water, ensuring it is fully submerged without trapping any air bubbles.

c. Record the new volume of water in the cylinder.

d. The volume of the irregular solid is equal to the difference between the final and initial water volumes.

The volume is;

32 mL - 20 mL = 12 mL

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The cathodic protection of Cu(s) can be provided if it is connected galvanically to Zn.

The metal with the more reduction potential will act as the anode and undergo oxidation, while the metal with the more positive standard reduction potential will act as the cathode and undergo reduction.

As Cu has a greater reduction potential than Zn, it has a greater capacity to reduce than that of Zn. So by galvanically connecting to zn, we can say that the cathodic protection of Cu can be obtained.

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When a liquid is heated, its particles gain energy and travel quicker; when it is chilled, the particles slow down and become closer together.

A particle (or corpuscule in older literature) is a tiny localized entity in the physical sciences that can be characterized by several physical or chemical characteristics such as volume, density, or mass.

They range in size and number from subatomic particles such as electrons to minuscule particles such as atoms and molecules to large particles such as powders and other granular materials. Particles can also be used to construct scientific models of bigger objects, such as people moving in a throng or celestial entities in motion, based on their density.

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The molecular geometry of BrF5 is sqaure pyramidal and the approximate bond angle is 120 degrees which is c.

The total number of valence electrons in bromine pentafluoride (BrF5) can be determined by adding the valence electrons of each atom. Bromine has 7 valence electrons and each fluorine atom has 7 valence electrons, so the total number of valence electrons in BrF5 is:

7 (from bromine) + 5(7) (from five fluorine atoms) = 42 electrons

The molecular geometry of BrF5 is square pyramidal, which means that it has one central bromine atom surrounded by five fluorine atoms. The shape of the molecule is distorted from a perfect octahedron due to the lone pair of electrons on bromine.

The approximate bond angles in BrF5 are 90 degrees for the axial fluorine atoms and 120 degrees for the equatorial fluorine atoms. The lone pair on bromine occupies an equatorial position, further distorting the bond angles. Therefore, the correct answer is c. 120 degrees.

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Answer:

x = 56

relative atomic mass is 58.933

Explanation:

finding the relative molecular mass of x first...

x + (C ×1) + (O ×1) =84

x + (12 ×1) + ( 16 × 1) =84

x + 12 + 16 =84

collect like terms

x = 84-12+16

x= 56

now...

half of 56...

56÷2 =27

and 27 is the atomic number of cobalt...

so relative atomic mass of cobalt is 58.933.

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The change in internal energy of the gas is 123.7 J.

The change in internal energy of a gas can be calculated using the equation: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to or removed from the gas, and W is the work done on or by the gas.

In this case, the work done on the gas can be calculated as W = P * ΔV, where P is the pressure and ΔV is the change in volume. Since the pressure is 1.00 bar and the change in volume is 5.50 L - 1.20 L = 4.30 L, the work done on the gas is W = 1.00 bar * 4.30 L = 4.30 J.

Therefore, the change in internal energy of the gas is ΔU = Q - W = 128 J - 4.30 J = 123.7 J.

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An illustration of the electron configuration is called orbital notation. It is highly helpful in forecasting oxidation numbers and electron pairing. An electron configuration can be written using orbital notation to give more detailed information about the electrons in an atom.

The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. The sign of a noble gas enclosed in square brackets replaces the electrical configuration of that noble gas. However, long electron configurations are frequently produced by the usual notation.

The electron configurations, and noble gas notation for the following elements are:

1. 1s²2s²2p¹, [He] 2s² 2p¹

2. 1s²2s²2p⁶3s²3p², [Ne] 3s² 3p²

3. 1 s² 2s² 2p⁶ 3s² 3p⁴, [Ne] 3s² 3p⁴

4. 1s²2s²2p⁶3s²3p⁶4s², [Ar] 4s²

5. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s² 5p⁵, [Kr] 4d¹⁰ 5s² 5p⁵

6. 1s² 2s²2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹, [Kr] 5s¹

7. 1 s² 2 s² 2 p⁶ 3 s² 3p⁶ 4s¹ 3d⁵, [Ar] 3d⁵ 4s¹

8. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹,  [Ar]4s² 3d¹⁰4p¹

The orbital notations are given below:

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Answer:

Potassium nitrate (KNO3) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water

Potassium nitrate (KNO3) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

 a supply of electric charges which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges.

Explanation:

There's your answer have a good day

The three professional areas that uses metric system are the scientific fields, medical fields, or technical fields.

The metric system is a measurement method that utilizes the meter, liter, as well as gram as base units for length for distance, capacity for volume, and weight for mass.

The primary factors for the United States' failure to embrace the metric system are simply cost and time.

When the country's Industrial Revolution began, expensive manufacturing plants was becoming a major source of American jobs and basic goods.

Thus, the scientific, medical, and technical fields are the three professional fields that use the metric system.

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Phosphodiester bonds do not contribute to the noncovalent interactions that stabilize the helical strands of DNA. The other four factors - hydrophobic interactions, hydrogen bonds, base stacking, and hydration - all play important roles in maintaining the stability of the double helix structure.

The term that does not contribute to the noncovalent interactions that stabilize the helical strands of DNA is phosphodiester bonds. These bonds are covalent in nature and connect the sugar and phosphate groups in the DNA backbone, whereas the other terms (hydrophobic interactions, hydrogen bonds, base stacking, and hydration) are all related to noncovalent interactions that help stabilize the DNA structure.

A phosphodiester bond is a type of chemical bond that connects nucleotides in DNA and RNA molecules. It forms between the 3' carbon of one nucleotide and the 5' carbon of the adjacent nucleotide, creating a backbone of alternating sugar-phosphate units.

The phosphodiester bond is formed through a condensation reaction, in which a hydroxyl group (-OH) from the 3' carbon of the sugar of one nucleotide combines with a phosphate group (PO4) from the 5' carbon of the sugar of the next nucleotide. During this reaction, a molecule of water (H2O) is released.

The resulting linkage between the sugar and the phosphate group is a phosphodiester bond. It is a covalent bond characterized by the sharing of electrons between the oxygen atom of the phosphate group and the carbon atom of the sugar, while the phosphate group itself carries a negative charge.

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Arsenic poisoning affects the activity of the pyruvate dehydrogenase complex by covalently modifying the lipoamide groups on the enzyme. This inactivates the enzyme and thus inhibits its ability to catalyze the conversion of pyruvate to acetyl-CoA.

In the process of arsenic poisoning, the arsenic compounds can modify the activity of the pyruvate dehydrogenase complex by covalently modifying a lipoamide group. Arsenic binds to sulfur in cysteine residues in many proteins, which affects protein structure and activity.

The arsenic compound reacts with dithiols and covalently modifies a lipoamide group, which directly affects the E2 subunit of the pyruvate dehydrogenase complex. E2 subunit has a lipoamide group, which acts as a cofactor, and is critical for its catalytic activity. This cofactor is also important for the interactions between the E2 subunit and other subunits of the pyruvate dehydrogenase complex. Hence, when this group is modified by arsenic compounds, it can cause irreversible inactivation of the pyruvate dehydrogenase complex. As a result, pyruvate cannot be converted to acetyl CoA, and glucose metabolism is disrupted, leading to symptoms of arsenic poisoning.

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Answer:

4. one

Explanation:

When you dissolve a cube of sugar in a cup of tea, the entropy of the system increases.

The system in this context consists of the sugar cube and the tea. Initially, the sugar molecules are arranged in a crystalline structure, which is an ordered state. When the sugar cube is dissolved in the tea, the sugar molecules spread out and mix with the tea molecules, forming a more disordered state. As the randomness of the system increases, so does its entropy. Therefore, the entropy of the system increases when you dissolve a cube of sugar in a cup of tea.

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