Calculate the delta H for the reaction 2Al(s) + 3Cl2 (g) = 2AlCI3 (s) from the following data.

1) 2Al (s) + 6HCl (aq) = 2AlCl3 (aq) + 3H2 (g) with delta H of -1049 kj

2) HCl (g) = HCl (aq) with delta H of -74.8 kj

3) H2 (g) + Cl2 (g) = 2HCl (g) with delta H of -1845 kj

4) AlCl3 (s) = AlCl3 (aq) with delta H of -323 kj

The balanced chemical equation for the combustion of one mole of methane (CH4) is 2K(s) + Cl2(g) → 2KCl(s).

This reaction is endothermic, meaning that it requires heat to be absorbed in order to occur. The enthalpy diagram for this reaction would have a positive ΔH value, as the products have a higher enthalpy than the reactants.This reaction is endothermic, meaning that it requires heat to be absorbed in order to occur. The enthalpy diagram for this reaction would have a positive ΔH value, as the products have a higher enthalpy than the reactants Endothermic decomposition of solid calcium carbonate.The balanced equation for the decomposition of solid calcium carbonate.

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Answer:

placing a real silver item on ice will cause the ice to melt a bit quicker. However, that’s not because of any properties in the silver itself; rather, it’s because heat melts ice , and silver is one of the best conductors of heat, according to Tom Chandler, a Metallurgical Engineer who specializes in heat treatable high-temperature copper alloys.

Explanation:

H₃PO₄ + 3Na HCO₃ →Na₃ PO₄ + 3H₂O + 3CO₂  is the  balanced chemical equation  for the following given  reaction .

A balanced equation is the equation that contains the same number of each type of atoms on both the left and right sides of the reaction arrow ,it means that both the reactants and the products are equal in the chemical reaction .

A neutralization reaction  is a chemical reaction in which an acid reacts with a base or alkali to form water and salt.

H₃PO₄ + 3Na HCO₃ →Na₃ PO₄ + 3H₂O + 3CO₂  is the  balanced chemical equation  for the following given  reaction .

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Answer:

I would say the last one because mass is not created nor destroyed.

Explanation:

The statement that is correct about impact craters and maars is that impact craters form over short periods of time, and maars form over long periods of time. So the correct option is B.

Maars are those volcanic craters that will form when the magma touches the water that will be in the underground area, producing an explosion formed by steam. It can be formed by one or more volcanic explosions that will release steam, water, ash, and magmatic material.

As for the impact crater, it is a depression that will be left on the surface of the planet given by the collapse of a planetary body. They're going to have raised edges and their floor will be lower, because it's going to be caused by this collapse instead of an internal explosion.

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a) The selectivity of a reaction is defined as the ratio of the rate of formation of the desired product to the sum of the rates of formation of all products. In this case, we have two parallel reactions: A ⟶ D and A ⟶ U. The selectivity (S) can be calculated as:

S = (rate of formation of D) / (rate of formation of D + rate of formation of U)

b) Manipulating the concentration of species A (CA) can affect the selectivity by altering the reaction rates of the individual pathways. By increasing or decreasing the concentration of A, we can favor one reaction pathway over the other, thereby increasing selectivity.

To justify this, let's consider the rate equations for the two reactions:

Rate of formation of D = k0 * CA

Rate of formation of U = k11 * CA

From the rate equations, it is clear that the rates of formation for both D and U are directly proportional to the concentration of A (CA). By increasing CA, both reaction rates will increase. However, the relative increase in the rate of the desired product (D) will be larger compared to the increase in the rate of the undesired product (U) if the rate constants (k0 and k11) are significantly different.

Thus, by manipulating the concentration of A, we can adjust the ratio of the reaction rates and bias the system towards the desired product, thereby increasing selectivity.

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A. Precipitation. Precipitation occurs when water vapor condenses into liquid or solid form and falls to the Earth's surface.

Snow falling from the atmosphere and accumulating on a glacier represents the process of precipitation in the water cycle. Precipitation occurs when water vapor condenses into liquid or solid form and falls to the Earth's surface. In this case, the water vapor condenses into snowflakes and falls onto the glacier, contributing to its accumulation of snow and ice. This is a crucial step in the water cycle as it replenishes the Earth's freshwater resources and plays a significant role in shaping landscapes, particularly in colder regions where glaciers are present.  Snow falling from the atmosphere and accumulating on a glacier represents the process of precipitation in the water cycle. Precipitation is the phase where water vapor condenses into solid or liquid form and falls to the Earth's surface.

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When water is boiling, adding heat does not increase the temperature. Correct option is d.

When water reaches its boiling point, which is 100°C (212°F) at standard atmospheric pressure, any additional heat supplied will not increase its temperature. Instead, the added heat is utilized to convert water from its liquid state to vapor through a process called phase transition.

During this phase change, the temperature remains constant as the extra energy is used to break the hydrogen bonds between the water molecules, allowing them to escape as steam. This is why the temperature does not increase even when more heat is added to boiling water.

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Given,HgO(s) → 2Hg(l) + O2(g) Mass of HgO(s) = 4.37 g Mass of Hg(l) = 3.21 g, This equation needs to be balanced

The balanced equation for the reaction between HgO and Hg is as follows:2HgO(s) → 2Hg(l) + O2(g)The molar mass of HgO is calculated as follows:Total mass of HgO = 4.37 gMolar mass of HgO = 216.59 g/molThe number of moles of HgO can be calculated as follows:Number of moles of HgO = (mass of HgO) / (molar mass of HgO)= 4.37 g / 216.59 g/mol = 0.02018 molAccording to the balanced equation, one mole of HgO will produce two moles of Hg. Therefore, 0.02018 moles of HgO will produce (2 x 0.02018) = 0.04036 moles of Hg.The molar mass of Hg is calculated as follows:Molar mass of Hg = 200.59 g/molThe mass of Hg produced in the reaction can be calculated as follows:Mass of Hg produced = (number of moles of Hg) x (molar mass of Hg)= 0.04036 mol x 200.59 g/mol = 8.10 gThe percent yield of the reaction can be calculated as follows:Percent yield = (actual yield / theoretical yield) x 100The theoretical yield of Hg is calculated as follows:Theoretical yield of Hg = (molar mass of Hg) x (number of moles of HgO)= 200.59 g/mol x 0.02018 mol = 4.049 gNow,Percent yield = (actual yield / theoretical yield) x 100= (3.21 g / 4.049 g) x 100= 79.31%. Chemical equation is 2HgO(s) → 2Hg(l) + O2(g). The balanced equation states that 2 moles of mercury oxide will produce 2 moles of mercury. Hence, to find the theoretical yield, the number of moles of HgO is calculated using the given mass of HgO and then multiplied by the molar mass of HgO. Similarly, to find the actual yield of Hg, the mass of Hg produced is calculated using the molar mass of Hg and the number of moles of Hg calculated using stoichiometry. Finally, the percent yield is calculated using the actual and theoretical yield. The percent yield of the reaction is 79.31%

Therefore, the percent yield of the reaction is 79.31%.

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A limiting reagent is one that is completely consumed during a reaction, hence restricting the product's yield. Compared to the limiting reagent, the other reactant(s) are present in excess.

The amount of product that could be produced based on the molar ratios is known as the theoretical yield. The amount that was actually retrieved is divided by the theoretical yield to determine the percent yield. For this amount to be expressed as a percentage, multiply it by 100.

Acetylation is an organic esterification reaction using acetic acid in organic chemistry. It gives a chemical molecule an acetyl group. These substances are known as acetate esters or just acetates. The opposing reaction, deacetylation, involves removing an acetyl group from a chemical molecule.

Deacetylation is the removal of an acetyl group from an organic chemical molecule, whereas acetylation is the introduction of an acetyl functional group (acetoxy group, CH3CO) into an organic chemical compound, specifically the substitution of the acetyl group for a hydrogen atom.

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Answer:

linear

Explanation:

.....................…...…

Explanation:

bent with an H-0-H angle if 104.5°

Answer:

Oc. Y is your correct answer

Answer:

k Nishant

Explanation:

the answer is oC . Y

We would anticipate seeing just one singlet in the H-NMR spectra of p-acetophenetidin based on the fundamentals of splitting in H-NMR.

Each proton in the molecule will experience the same local magnetic environment and is chemically identical. They won't be split by nearby protons because they will absorb at the same frequency. As a result, we anticipate seeing a single peak in the spectrum that represents each of the molecule's protons. (refer image)

P-acetophenetidin, sometimes referred to as phenacetin, is a painkiller and fever reducer that has been around since 1887. It was frequently used as a treatment for fever and pain in the form of an A.P.C., or "aspirin-phenacetin-caffeine" compound analgesic. Up until the third quarter of the 20th century, phenacetin was extensively utilized.

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Compounds that are not soluble in water at room temperature are called insoluble compounds. These insoluble compounds are a group of substances that do not dissolve in water even when subjected to continuous stirring and mixing.

Aqueous solutions of these compounds have an extremely low solubility at normal temperatures and pressures. Due to their non-polar nature, they do not interact well with the polar water molecules, making it difficult for them to dissolve.To determine which compounds are insoluble in water at room temperature, let's look at the chemical formulas given in the question. The given compounds are:l CaSO4ll PbCl2lll KBrIV KNO3Among these, only lead chloride and calcium sulfate are not soluble in water at room temperature. Therefore, the correct answer is option A) I and II only.In conclusion, only CaSO4 and PbCl2 are not soluble in water at room temperature among the given compounds.

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Answer:

1) 8 valence electrons are a full shell that makes the atom more stable.

Explanation:

Due to the octet rule, atoms tend to form compounds in ways that give them eight valence electrons and thus give them the electron configuration of a noble gas, making them stable.

Answer:

Rutherford proved J.J is wrong.

Explanation:

The Plum Pudding Model which was put forth by J.J Thompson stated that atoms are tiny particles of positively charged particles, with tiny negative charged particles stuck inside.

When Rutherford did the goldfoil experiment, he concluded that electrons (the negatively charged particles) actually revolve around the nucleas.

what's the nucleas?

So this too, was put forth by Rutherford that there is a centre of positive charges in an atom called nucleas it consists of protons and neutrons

hence, Rutherford proved that Plum Pudding Model was wrong.

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When you touch a hot potato with your finger, energy flows. Touch is a sense that is associated with the detection of pressure, temperature, and pain. In the scenario presented the touch of the hot potato by the finger results in the transfer of heat energy from the potato to the finger.

When the finger comes into contact with the hot potato, the energy from the potato flows to the finger. The hot potato has more energy, which is transferred to the finger, making the finger feel hotter. This heat energy transfer is caused by a difference in temperature between the two objects. The flow of energy from the hot potato to the finger occurs until both objects reach thermal equilibrium (the same temperature). In this case, the transfer of energy continues until the finger and the potato have reached the same temperature. The rate of energy transfer depends on the temperature difference between the two objects. The greater the temperature difference, the greater the rate of energy transfer.In conclusion, when you touch a hot potato with your finger, energy flows from the hot potato to the finger, resulting in the transfer of heat energy.

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Answer:

Mercury

Explanation: Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temperature.

Answer:

Mercury, Venus, earth and mar, Jupiter, Saturn, urines, Neptune.

Explanation:

Answer:

∴ Q = -7.52kCal

Explanation:

Using the formula for specific heat capacity:

Q = mcΔT

where ΔT = change in temperature (final - initial)  = (0 - 100)°C = -100°C

m = mass (g) = 75g

c = specific heat capacity = 4.2 J/g°C in water

⇒ Q = 75 × 4.2 × -100

= -31,500J

But 1J - 0.000239kCal

∴ Q = -7.52kCal

Let me know if I can be of further assistance.

The Big Bang theory claims that hydrogen was the first element to form.

Atomic number 1 and the letter H are used to identify the chemical element hydrogen. In the cosmos, it makes up around 75% of the elemental mass and is the lightest and most prevalent element. At room temperature and pressure, hydrogen is a colorless, tasteless, odorless gas that is non-toxic.

The Big Bang theory claims that hydrogen was the first element to form. The universe was made of a hot, dense plasma of protons, neutrons, and electrons in the initial moments following the Big Bang. These particles merged when the cosmos cooled and expanded to create hydrogen atoms, which subsequently fused to create the first stars. Helium, carbon, oxygen, and other atoms that make up the universe we see today were converted into heavier elements through nuclear fusion in these stars.

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To produce 180 millilitres of a saline solution of the same concentration, we need 1.2 milligrams of salt.

It is given that a ratio of 0.5 milligrams of salt is present in 75 millilitres of solution. Let us assign a variable x to the amount of salt present in 180 millilitres of saline solution.

To maintain the same concentration we can use the method of cross-multiplication:

The following equation can be used to determine the value of x:

0.5 mg / 75 ml = x mg / 180 ml

( 0.5 × 180) / 75 = x mg

x mg = 90 / 75

Hence x is approximately equal to 1.2 mg.

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The sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).

According to the question , sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻) .  the atomic number of sulfur 16 and chlorine is 17

sulfur .

atomic number of sulfur is 16,

now, S²⁻  = 18 electrons

Cl⁻ = 18 electrons

The no. of electrons in S²⁻ and Cl⁻ are same 18 electrons. But S²⁻ ion has one proton less than Cl⁻ ion. So, the attractive force between the nucleus and electron is more that's the reason Cl⁻ ion is smaller  than S²⁻

Thus , the sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).

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Many scientists are dependent on the government for funding for many reasons. One of the main reasons is that research is often too expensive to carry out without the help of the government. Option b)

The government plays a major role in scientific research, especially in areas of national interest. Government research funding plays an important role in promoting scientific inquiry and advancing knowledge of the natural world. The government is in charge of allocating research funds to public and private organizations. For scientists who want to carry out their research, it can be challenging to find funding from other sources, such as private companies.

As a result, the majority of researchers rely on government grants to finance their work. This dependence on government funding has advantages and disadvantages . One of the advantages is that it ensures that scientific research is carried out in areas that are of national interest. By prioritizing funding for specific areas, the government can direct research toward those issues that are considered important to the country. Another advantage is that it can lead to more innovation. Government grants often provide funding for research that might not be carried out otherwise, such as new technologies or techniques. This can result in breakthroughs that lead to new products, services, or ideas.However, there are also some disadvantages to being dependent on government funding. One of the main drawbacks is that it can lead to a lack of independence. Researchers who rely on government grants may feel obligated to focus on areas that the government deems important, rather than pursuing their own interests or those that are considered unconventional. Another disadvantage is that government funding can be unpredictable. Grants are usually awarded for a limited period of time and may be subject to budget cuts or changes in priorities. As a result, scientists may have to constantly seek new sources of funding or may be forced to abandon their research projects. Hence option b) is correct.

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Answer:

it's answer is 24 yards

hope it helps you friend

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Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

\(P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ \)

actual density = 11.4g/cm³

error = 11.4 - 10.8 = 0.6

We have

\(p(\%) = \frac{0.6}{11.4} \times 100 \\ = 5.263157894...\)

We have the final answer as

Hope this helps you

Answer:

mid orbitals

Explanation:

Usually mid orbitals has highest energy. Note after the electrons reach 32 they can't be accumulated in a shell.

Answer:

Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons. Sodium atoms have 11 electrons. Two of these are in the lowest energy level, eight are in the second energy level and then one electron is in the third energy level

Explanation:

Answer:

A. The equilibrium shifts right to produce more SO3 molecules.

Increasing concentration results in an increased amount of effective collisions in turn leading to a higher reaction rate.