What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide?

answer is B value of approximation

solving

The heat of vaporization for water is 40.7 kJ/mol, which means that it takes 40.7 kJ of energy to convert 1 mole of water from a liquid to a gas phase.

The energy required to boil the water is given as 63.8 kJ.

We can set up a proportion using these values:

40.7 kJ/1 mol = 63.8 kJ/x mol

To solve for x (the number of moles of water), we can cross-multiply and solve the equation:

40.7 kJ * x mol = 63.8 kJ * 1 mol

x mol = (63.8 kJ * 1 mol) / 40.7 kJ

x mol ≈ 1.57 mol

Since we know the molar mass of water is approximately 18.015 g/mol, we can convert moles to grams:

1.57 mol * 18.015 g/mol ≈ 28.29 g

Therefore, the mass of the sample of water is approximately 28.29 grams.

Answer:

SO4²

Explanation:

Formula and structure: The sulfate ion formula is SO42- and the molar mass is 96.06 g mol-1. This salt is formed by one sulfate center to which 4 atoms of oxygen are attached, 2 of these atoms are forming S=O.

Answer:

\(so _{4} ^{2 - } \)

Explanation:

sulfate is consisting of sulfur element with 4 oxygen as the structure in the pic given and this group is 2- charged

When a substance changes from a solid to a liquid, it is undergoing a process called melting. During this process, energy is added to the substance in the form of heat. This energy causes the bonds between the atoms or molecules in the solid to break, allowing them to move freely and take on the characteristics of a liquid.

We can understand by many ways such as when a substance changes from a liquid to a gas, it is undergoing a process called vaporization or boiling. During this process, energy is added to the substance in the form of heat. This energy causes the bonds between the atoms or molecules in the liquid to break, allowing them to move freely and take on the characteristics of a gas.

When a substance changes from a gas to a liquid or a solid, it is undergoing a process called condensation or solidification. During this process, energy is removed from the substance in the form of heat. This energy causes the atoms or molecules in the gas to lose their kinetic energy, slowing down their movement and allowing them to bind together, taking on the characteristics of a liquid or a solid.

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The Correct Question is:-

What will be the reaction when we change any substance from solid to liquid  gas?

Atomic or hybrid orbitals make up the sigma bond between c1 and c2 in ethane, ch3ch3 are one s orbital and 2 p orbital

Sigma bonds are the most powerful type of covalent chemical link. They are generated by atomic orbitals overlapping head-on. For diatomic molecules, sigma bonding is most readily explained using the language and tools of symmetry groups.

Chemical covalent bonds are sigma bonds and pi bonds. The overlap of atomic orbitals creates sigma and pi bonds. Sigma bonds are produced by overlapping from end to end, whereas Pi bonds are created when the lobe of one atomic orbital overlaps another.

Sigma bonding can be seen in the link between two hydrogen atoms. Sigma bonds are also formed between the sp3 orbitals of hybridized carbon and the s orbitals of hydrogen in methane.

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Answer:

They include: Chemical nature of the pollutant - how active and toxic it is to humans, plants and animals; Concentration - the amount of the chemical per unit volume of air, water, soil, and; Persistence or longevity - how long the pollutant remains in the environment in its harmful form.

Explanation:

Air pollutants like ozone, particulate matter, carbon monoxide, nitrogen oxide, sulfur dioxide, lead cause atmospheric pollution which regards to ozone depletion, GH effect, climate change and human health effects. If anyone say the main factors of air pollution beyond of industry, means of transportation, solid waste generation and urbanization.

Growing urbanization and industrialization grows more pollution. Due to a large number of population in the world, more pollution is generated. Specifically if we talk about air pollution, due to steady increase in number of industries, the gradient level is deteriorating day by day. There is no good if we just talk about sustainable development if we are not following it.

Answer:

Explanation:

You should probably rephrase this:

According to Coulomb's Law, as the number of protons in an atom increases (or atomic number), the nuclear energy of atoms will increase, pulling electrons closer.

I think the order would be Be, Li, K but feel free to check online before you submit any work with this.

Answer:

4.5 lb (pounds)

Explanation:

IF YOU CONVERT OUNCES TO POUNDS 72 OZ IS EQUAL TO 4.5 POUNDS

210.83 mL of water would be needed to prepare 250 mL of a 2.35 M HF solution.

To calculate the volume of the 15.0 M stock solution needed, we can rearrange the formula as follows: V1 = (C2V2) / C1
V1 = (2.35 M * 250 mL) / 15.0 M

V1 ≈ 39.17 mL.
Therefore, you would need approximately 39.17 mL of the 15.0 M HF stock solution to prepare 250 mL of a 2.35 M HF solution.

b) To calculate the volume of water needed, we subtract the volume of the stock solution from the final volume of the diluted solution:

Volume of water = V2 - V1
Volume of water = 250 mL - 39.17 mL

Volume of water ≈ 210.83 mL.

Therefore, approximately 210.83 mL of water would be needed to prepare 250 mL of a 2.35 M HF solution.

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Answer:

Potassium (K)

Strontium (Sr)

Magnesium (Mg)

Explanation:

The cation in Potassium Chloride (KCl) is Potassium (K) because of Potassium’s placement on the periodic table it has a charge of +1 while Chlorine has a charge of -1, making it the anion with a 1:1 ratio.

The cation in Strontium Chloride (SrCl2) is Stronitum (Sr) because of Strontium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

The cation in Magnesium Chloride (MgCl2) is Magnesium (Mg) because of Magnesium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

hope this helps :)

During catalytic cracking, operation gas oil enters the reactor and is mixed with a superheated powdered catalyst. The term "cracking" is applied to this process because, during vaporization, the molecules literally split apart and are sent to a fractionation tower for further processing.

Catalytic cracking is an essential method in the petroleum refining industry, as it helps convert heavy oils into more useful products such as gasoline, diesel, and jet fuel. The superheated powdered catalyst promotes the breaking of carbon-carbon bonds within the hydrocarbon molecules, which allows them to recombine into different structures.

Once the cracking process is complete, the resulting mixture is sent to a fractionation tower for further processing. In the fractionation tower, the cracked products are separated based on their boiling points. Lighter fractions, like gasoline and diesel, have lower boiling points and rise to the top of the tower, while heavier fractions with higher boiling points settle at the bottom.

The catalyst used in the process becomes deactivated over time due to the build-up of coke, a byproduct of the cracking reaction. Therefore, it needs to be regenerated periodically by burning off the coke to restore its activity.

Overall, catalytic cracking is a crucial process in the petroleum industry, enabling the conversion of less valuable heavy oils into a range of useful products that power our modern society.

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Answer: Ba, Sr, Ra, Ca, Mg, Be.

Explanation:

The ionization energy is the energy required to remove an electron from an atom or a positive ion. It is the energy required to overcome the electrostatic attraction between the electron and the positively charged nucleus. The ionization energy decreases as you move down a group (vertical column) in the periodic table. It also decreases as you move from left to right across a period (horizontal row) in the periodic table.

Solution d will have the lowest pH and be most acidic. The pH of a solution is inversely proportional to the strength of the acid, which means the stronger the acid, the lower the pH, and the more acidic the solution.

The strength of an acid is determined by its dissociation constant, Ka. A smaller Ka value means a weaker acid and a larger Ka value means a stronger acid. The pH of the four solutions will be calculated using the following equation: pH = pKa + log([A-]/[HA]), where [A-] and [HA] are the concentrations of the conjugate base and acid, respectively, and pKa is the dissociation constant of the acid.

Here, we have the following pKa values: acid pka ha 4.00 hb 7.00 hc 10.00 hd 11.00The strongest acid will have the smallest pKa value and the weakest acid will have the largest pKa value.

Therefore, the order of acidic strength is: d > c > b > a The lowest pH and the most acidic solution will be that which has the strongest acid. Since acid d has the lowest pKa value, it is the strongest acid, and its solution will have the lowest pH and be the most acidic.

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Answer:

319

Explanation:

The molecular mass of C3H18 can be found by adding up the molecular weights of carbon and hydrogen so, (12.01 x 3) For Carbon and (1.008x18) for hydrogen. You will find it is 54.174g/mol.

To find grams muliply g/mol by mols so 5.9 x 54.174= 319 i didnt see any errors with my math so maybe you clicked 8 by accident but i may just be wrong

Answer:

2CO2 + 3H2O ---> C2H5OH + 3O2

The working is in the picture.

To find the molecular formula, we would need to multiply the empirical formula by the whole number required to reach the molar mass of 62.00 g, which is likely to be C2H4O2.

To obtain the empirical formula, the percentage composition of each element must be converted to moles and divided by the smallest number of moles obtained. From the empirical formula, the molecular formula can be determined by multiplying the empirical formula by the whole number required to reach the desired molar mass.

The molar mass is the mass of a substance in grams that contains Avogadro's number of entities of that substance. It is usually expressed in units of grams per mole (g/mol). The molar mass is used to convert the amount of a substance in moles to its mass in grams.

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There are five different structural isomers that can be described by the molecular formula \(C_4H_8\).

The molecular formula \(C_4H_8.\) indicates the presence of four carbon atoms and eight hydrogen atoms. To determine the number of structural isomers, we need to consider the different ways these atoms can be arranged.

Start by drawing the straight-chain isomer, where the carbon atoms are arranged in a linear fashion. This is the simplest form and is represented as \(CH_3-CH_2-CH_2-CH_3\).

Next, consider branching off the main chain. One carbon atom can branch off from any of the three interior carbon atoms, creating three different isomers.

Finally, we can have a ring structure where the carbon atoms form a closed loop. In this case, there are two possibilities: a three-carbon ring known as cyclopropane, and a four-carbon ring known as cyclobutane.

Combining these three types of isomers (straight-chain, branched, and cyclic), we have a total of five structural isomers for the molecular formula \(C_4H_8.\)

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Answer:

the answer is not d because you can pee without moving. so its a because without the food nutrient no part of our body can work

Answer:

b

Explanation:

the ocular lens or eyepiece lens ...so its b

The new pressure of the gas after expanding to a volume of 54 L is 0.063 atm.

What is new pressure?

The pressure of a gas is the force that the gas exerts on the walls of its container per unit of area. It is a measure of the force that gas molecules exert on the walls of a container as they collide with it. The pressure of a gas is directly proportional to the number of gas molecules in the container and their average kinetic energy.

We can use Boyle's Law to solve this problem, which states that the pressure of a gas is inversely proportional to its volume, as long as the temperature and number of moles of gas remain constant. Mathematically, Boyle's Law can be written as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

We can rearrange this equation to solve for P2:

P2 = P1V1/V2

Substituting the given values, we get:

P1 = 0.86 atm

V1 = 3.92 L

V2 = 54 L

P2 = 0.86 atm × 3.92 L / 54 L

P2 = 0.06285185 atm

Rounding this value to the thousandths place, we get:

P2 = 0.063 atm

Therefore, the new pressure of the gas after expanding to a volume of 54 L is 0.063 atm.

Boyle's Law is named after Robert Boyle, an Irish scientist who studied the properties of gases in the 17th century. The law is important in many areas of science and engineering, including the design of engines, the behavior of atmospheric gases, and the production of gases for industrial applications.

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Complete question is: A gas with a volume of 3.92 L at a pressure of 0.86 atm is allowed to expand until the volume raises to 54 L. Its new pressure will be 0.063 atm.

Answer:

Watson and Crick were also aided in their discovery by Maurice Wilkins (1916-2004) and Rosalind Franklin (1920-1958). Franklin had taken X-ray photographs of DNA that her colleague, Wilkins, showed to Watson

Explanation:

Answer:

Rosalind Franklin. She discovered DNA as a double helix form. But men got jealous of her and stole her work just because she is a woman. How cruel! That's why there is something called feminism in this world.  

Explanation:

Hope it helped!

Answer:

choice D. Ionic, because valence electrons are transferred.

Explanation:

Answer:

All cells share a few features in common, but within a

human there are many types of cells.

Explanation:

Your body has many different kinds of cells. Though they might look different under a microscope, most cells have chemical and structural features in common.

Answer:

Cobalt, Nickel, Chromium, and Copper

The partial pressure of the hydrogen gas collected in this way is 710 mmHg. When collecting a gas over water, the total pressure of the system includes the vapor pressure of water at that temperature

When collecting a gas over water, the total pressure of the system is the sum of the partial pressure of the gas and the vapor pressure of water at that temperature. In this case, the total pressure is given as 742 mmHg, and the vapor pressure of water at 30°C is 31.8 mmHg.

To find the partial pressure of the hydrogen gas, we need to subtract the vapor pressure of water from the total pressure. Therefore, the partial pressure of the hydrogen gas can be calculated as:

Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water

Partial pressure of hydrogen gas = 742 mmHg - 31.8 mmHg

Partial pressure of hydrogen gas = 710 mmHg

In this chemical reaction, the collected hydrogen gas exerts a partial pressure of 710 mmHg.

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The standard potential for the given galvanic cell is +1.06 V.

To calculate the standard potential for the given galvanic cell, we need to determine the individual reduction potentials of the half-reactions and then subtract the potential of the anode (where oxidation occurs) from the potential of the cathode (where reduction occurs).

Given reduction half-reaction potentials:

Ag+(aq) + e^− → Ag(s): E∘ = +0.80 V

Ni2+(aq) + 2e^− → Ni(s): E∘ = -0.26 V

Since we have the reduction potentials for both half-reactions, we can directly calculate the standard potential for the cell:

E∘(cell) = E∘(cathode) - E∘(anode)

= E∘(Ag+(aq) + e^− → Ag(s)) - E∘(Ni2+(aq) + 2e^− → Ni(s))

E∘(cell) = +0.80 V - (-0.26 V)

= +1.06 V

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The condensed structural formula for the product of the hydrogenation of 2-butene using a platinum catalyst  CH3 – CH2 – CH2 – CH3

What is hydrogenation of alkene ?

Molecular hydrogen (H2) and another substance or element undergo a chemical reaction known as hydrogenation, typically in the presence of a catalyst such as nickel, palladium, or platinum. The method is frequently used to saturate or decrease organic molecules.

In order to give shortenings a hard firmness and plasticity, hydrogenation is the process of saturating certain double bonds and converting others to trans configuration. This enables the formation of solid and semi-solid fats.

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