Please help!!

Show the electronic configuration of magnesium atom​.

Answer:

1. A 2. C

Explanation:

because it just is

The equilibrium constant K for the given reaction at 25°C is approximately 2.5 × 10²² with two significant figures.

To calculate the equilibrium constant (K) for the reaction Co(s) + 2Ag⁺(aq) → Co₂⁺(aq) + 2Ag(s) at 25°C, we first determine the standard cell potential (E°) using the given standard reduction potentials.

E°cell = E°cathode - E°anode Since Ag⁺ is being reduced and Co is being oxidized, the equation becomes:

E°cell = 0.80 V - (-0.28 V) = 1.08 V

Next, we use the Nernst equation to find the relationship between E°cell and K:

E°cell = (RT/nF) K R = 8.314 J/(mol K)

T = 298 K (25°C)

n = 2 moles of electrons

F = 96485 C/mol

1.08 V = ((8.314 J/(mol K)) × 298 K) / (2 × 96485 C/mol) × ln K

Solving for K, we get the equilibrium constant:

K ≈ 2.5 × 10²²

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Answer:

\(\boxed{\rm Al_{\,(s)}+Fe_2O_{\,(s)} \rightarrow Al_2O_{3\,(s)} + Fe_{\,(s)}}\)

Explanation:

Aluminium metal + iron(I) oxide powder → aluminium oxide solid + iron metal

This is an example of a displacement reaction, with chemical equation:

\(\boxed{\rm Al_{\,(s)}+Fe_2O_{\,(s)} \rightarrow Al_2O_{3\,(s)} + Fe_{\,(s)}}\)

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Energy density is the measurement of calories per gram of a specific food item. If a food has high energy density, it has more calories per gram; if a food has low energy density, it has fewer calories per gram.

Calculation of energy density: Energy density = kcals ÷ grams of food. Therefore, the energy density of a breakfast menu can be calculated using the above formula. The breakfast menu would be low in energy density if it had a small number of calories per gram of food.

A menu that is low in energy density is a healthy alternative because it is rich in fiber, protein, and micronutrients. This food gives a person the feeling of fullness while also providing the necessary nutrients. The energy density of the breakfast menu can be determined by dividing the total number of calories by the total number of grams of food. The sum of calories in the menu must be determined first, followed by the weight of all the ingredients in grams.

Finally, calories should be divided by grams to determine energy density.

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The type of context clue in the sentence "Rats and other vermin were common" that helps infer the meaning of "vermin" as pests is an example or exemplification clue.

In this sentence, the word "rats" is provided as an example of vermin, indicating that vermin refers to similar creatures or pests. By using the word "and," the sentence suggests that rats are just one type of vermin among others. This example serves as a contextual clue to understanding the meaning of the word "vermin" in the sentence. Exemplification clues rely on providing specific examples or instances that help clarify the meaning of a word or concept. In this case, the presence of rats in the sentence helps to establish the broader meaning of vermin as pests or undesirable creatures. By connecting vermin with a specific example, readers can infer the general category to which vermin belongs and understand its intended meaning in the sentence.

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The reaction will shift towards the left, and the concentration of PCl3 and Cl2 will increase, and the concentration of PCl5 will decrease.150 is not useful here.

The given equation is, PCl3(g) + Cl2(g) ↔ PCl5(g) + Heat.

At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction.

The system will respond to a temperature increase in such a way that the equilibrium will shift in the endothermic direction.

As a result, the concentration of PCl5 will decrease, and the concentrations of PCl3 and Cl2 will increase.

The explanation for the same is:

On increasing the temperature, the equilibrium will shift in such a way that it will utilize the excess heat by consuming it. It will move in the direction where the heat is consumed.

Here, the reaction is endothermic, so the reactants' side is favored as the heat is being absorbed.

Therefore, the concentration of PCl3 and Cl2 will increase, while the concentration of PCl5 will decrease.

As a result, the reaction will shift towards the left, and the concentration of PCl3 and Cl2 will increase, and the concentration of PCl5 will decrease.150 is not useful here.

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Answer: \(2168 ^{\circ} \text{C}\)

Explanation:

For this question, we can use the formula \(Q=mc \triangle T\), where \(Q\) is the amount of heat absorbed, \(m\) is the mass of the sample, \(c\) is the specific heat constant, and \(\triangle T\) is the change in temperature (final temperature minus initial temperature as stated in the question).

From the question, we know that \(m=175, Q=1.57 \times 10^{6}\). Furthermore, we know that \(c=4.18\) (this is just a fact).

So, we get that \(1.57 \times 10^{6}=175(4.18)(\triangle T)\), meaning \(\triangle T=2146\).

Thus, \(t_{f}-22.0=2146 \longrightarrow t_{f}=\boxed{2168 ^{\circ} \text{C}}\)

The four complementary characteristics of colligative properties that a solution can display are an increase in boiling point, a decrease in freezing point, a relative decrease in vapor pressure, and an increase in osmotic pressure.

What are colligative properties?

Some characteristics of diluted solutions containing non-volatile solutes depend only on the quantity of solute particles present and not on the solute type. Collaborative qualities are what these traits are known as. Most frequently, diluted solutions exhibit these characteristics.

Collaborative properties can also be defined as those that result from the dissolution of a non-volatile solute in a volatile solvent. Typically, the solute alters the characteristics of the solvent by removing some of the solvent molecules from the liquid phase. Additionally, the concentration of the solvent is reduced as a result of this.

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Answer: C

Explanation:

Spaghetti and meatballs are Heterogeneous mixture. A heterogeneous mixture is a mixture that is not uniform in composition throughout the mixture.

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Here is a picture that might help :)

If the oil in your Thiele tube starts smoking when you are measuring the boiling point, it is an indication that the temperature has gone beyond the boiling point of the oil.

In this situation, the best action to take is to stop heating the Thiele tube immediately. Failure to stop heating the Thiele tube could cause the oil to catch fire, which could lead to a potentially dangerous situation.
Once you have stopped heating the Thiele tube, allow the oil to cool down. This will prevent any further damage to the equipment and ensure that the experiment can be repeated. Once the oil has cooled down, carefully remove the Thiele tube from the heating apparatus. It is important to do this carefully to avoid any spills or splashes, which could cause further damage or injury.
After the Thiele tube has been removed from the heating apparatus, clean it thoroughly to remove any residue or ash that may have accumulated. Once the Thiele tube has been cleaned, it can be used again for future experiments.

In conclusion, if the oil in your Thiele tube starts smoking during a boiling point measurement, you should immediately stop heating the tube, allow it to cool down, and then clean it thoroughly before using it again. This will ensure that the experiment can be safely repeated and prevent any potential hazards.

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The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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The H-N-H angle in ammonia is smaller than the H-N-H angle in the ammonium ion due to the repulsion between the electrons in the NH4+ molecule and the tetrahedral geometry of the ammonium ion.

Ammonia (NH3) and ammonium ion (NH4+) have different geometries due to the presence of an additional hydrogen ion (H+) in the ammonium ion. The H-N-H angle in ammonia is approximately 107 degrees, while the H-N-H angle in the ammonium ion is approximately 109.5 degrees. This difference in the H-N-H angles can be explained by the following reasons:

1. Electron repulsion: In the ammonium ion, there is an extra hydrogen ion that carries a positive charge. This positive charge attracts the electrons in the NH4+ molecule, resulting in a smaller bond angle. As a result, the electron pairs are pushed closer together, which causes the H-N-H angle to increase slightly.

2. Tetrahedral geometry: The ammonium ion has a tetrahedral geometry, with four equivalent bonds and bond angles of approximately 109.5 degrees. This geometry is more stable and has lower energy than the trigonal pyramidal geometry of ammonia. The tetrahedral geometry of the ammonium ion is due to the sp3 hybridization of the nitrogen atom, which results in four hybrid orbitals that are oriented towards the four hydrogen atoms.

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Answer:

Water is also produced alongside salt

Besides salt, water is formed as the other product when an acid reacts with an alkali. The acid-alkali reaction is a type of neutralization reaction. When an acid reacts with an alkali, they both react to form salt and water.

Salts are ionic compounds that are composed of cations and anions held together by ionic bonds. Salts have positive and negative ions that are held together by ionic bonds. They have high melting and boiling points and are crystalline solids at room temperature.

Acids are substances that produce hydrogen ions, H+ when dissolved in water. They have a sour taste and turn blue litmus paper to red.

Alkalis are bases that dissolve in water to form hydroxide ions, OH-. They are usually soluble in water and can be identified by their bitter taste and ability to turn red litmus paper blue.

When acids and alkalis react, they undergo a neutralization reaction, which results in the formation of salt and water. In this reaction, hydrogen ions (H+) from the acid and hydroxide ions (OH-) from the alkali react with each other to form water (H₂O). The remaining ions from the acid and alkali combine to form a salt.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is an example of an acid-alkali reaction.

HCl + NaOH → NaCl + H₂O

Acid + alkali → salt + water

Hence, water is the other product that is formed when an acid reacts with an alkali, apart from salt.

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Answer:

C

Explanation:

Higher turbidity allows water to absorb more sunlight, causing an increase in temperature.

Answer:

b refraction

Explanation:

i saw on nasa's website lol

Answer:

2

Explanation:

Because 2 oxygen atoms in reactant are balanced only when 2H2O is produced.

Answer:

see explanation

Explanation:                      

Answer:

The two such half field atomic orbitals compbine to from a molecular orbital which contains both these electrons. But helium (Z=2) has already a filled orbital (1s2). Therefore, the atomic orbitals of the helium atoms donot combine. Thus, a molecule of H2 exists while that of He2 does not.

Yes, the sea is considered a buffer.

A buffer is a solution that resists pH changes when acids or bases are added. The buffering capacity of the ocean allows it to maintain a relatively stable pH even when acids and bases are added.

The ocean's buffering capacity is primarily due to the presence of dissolved compounds such as bicarbonate (HCO3-) and carbonate (CO32-). These compounds act as both weak acids and bases, accepting and releasing hydrogen ions (H+) to maintain pH balance. When carbon dioxide (CO2) in the atmosphere dissolves in seawater, carbonic acid (H2CO3) is produced and decomposed into bicarbonate ions and hydrogen ions.

This transformation helps prevent a rapid drop in pH as excess hydrogen ions combine with carbonate ions to form bicarbonate ions, which can reduce overall acidity.

When alkali such as hydroxide ions (OH-) is added to the ocean, excess hydroxide ions combine with hydrogen ions to form water molecules, reducing alkalinity.

The presence of these dissolved compounds and their interconversion reactions stabilize the pH of the ocean, making it less susceptible to rapid changes in acidity or alkalinity. This buffering capacity is essential for the survival and maintenance of marine life, as many organisms are sensitive to changes in pH.

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To increase the equilibrium constant (K) of a reaction by a factor of 10, the change in Gibbs free energy (ΔG°) must decrease by approximately 5.708 kcal/mol. Whereas, the change in entropy (ΔS°) must increase by approximately 14.15 J/mol K.

This can be achieved by adjusting the reaction conditions or altering the concentrations of reactants and products.

If the change in entropy (ΔS°) is zero and the equilibrium constant of a reaction at 25°C is increased by a factor of 10, the change in enthalpy (ΔH°) must change by approximately 1.364 kcal/mol.

This implies a shift in the energy balance of the reaction, which can be influenced by adjusting temperature or introducing catalysts.

If the change in enthalpy (ΔH°) is zero and the equilibrium constant of a reaction at 25°C is increased by a factor of 10, the change in entropy (ΔS°) must increase by approximately 14.15 J/mol K.

This suggests that the reaction becomes more disordered or has an increased number of possible microstates, leading to a higher entropy value.

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Answer:

Explanation:

In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?

O C. Exhaust

Answer:

its C

Explanation:

The molarity of NaOH solution is 0.025 M which can be calculated as shown in the below section.

Molarity is the ratio of number of moles of solute to the volume of the solution in Liters.

Say, the mass of NaOH = 1 g

Volume of NaOH solution = 1 L

The molar mass of NaOH  = 39.997 g/mol

The number of moles can be calculated as follows-

No. of moles = 1 g / 39.997 g/mol

                      = 0.025 mol

Therefore, the molarity of the solution can be calculated as follows-

Molarity = 0.025 mol / 1 L

              = 0.025 M

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The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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Taking into account the definition of Avogadro's Number, the correct answer is option D. 6.023×10²⁴ atoms of zinc are present in 10.0 moles of zinc.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance.

Its value is 6.023×10²³ particles per mole.

Avogadro's number applies to any substance.

You can apply the following rule of three: If 6.023×10²³ atoms are present in 1 mole of Zn, how many atoms are present in 10 moles of Zn?

amount of atoms of zinc= (6.023×10²³ atoms × 01 mole)÷ 1 mole

amount of atoms of zinc= 6.023×10²⁴ atoms

Finally, 6.023×10²⁴ atoms of zinc are present in 10.0 moles.

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Answer:

increase

Explanation:

dont known reason burr answer is correct

Answer:

When temperature increases ,gas increases ,because of the rise in temperature evaporation will take place.

Explanation:

When you boil water to make coffee/tea the kettle/boiler releases the evaporation caused by the rise in temperature.

The average rate of the reaction during the first 15.0 seconds is 0.045 m/s.

The average rate of a reaction is the change in concentration of a reactant or product over a period of time. In this case, we are given the amount of oxygen gas produced and the volume of the reaction vessel, which we can use to calculate the concentration of oxygen gas.

First, we need to convert the volume of the reaction vessel from liters to cubic meters:

0.500 L = 0.500 x 10^-3 m^3

Next, we can use the amount of oxygen gas produced to calculate its concentration:

Concentration of oxygen gas = amount of oxygen gas / volume of reaction vessel
= 0.015 mol / 0.500 x 10^-3 m^3
= 30 mol/m^3

Now that we have the concentration of oxygen gas, we can calculate the average rate of the reaction using the formula:

Average rate = change in concentration / time interval

Since we are given the amount of oxygen gas produced in the first 15.0 seconds, we can assume that the time interval is also 15.0 seconds.

Therefore,

Average rate = (30 mol/m^3 - 0 mol/m^3) / 15.0 s
= 2.00 mol/m^3/s

Finally, we need to convert the units to m/s by dividing by the molar volume of gas at standard temperature and pressure (STP):

1 mol of gas at STP = 22.4 L
1 mol/m^3 = 22.4 / 1000 mol/L = 0.0224 mol/L
1 mol/m^3/s = 0.0224 mol/L/s = 0.0224 M/s

Therefore,

Average rate = 2.00 mol/m^3/s x 0.0224 M/s/mol
= 0.045 m/s

Thus, the average rate of the reaction during the first 15.0 seconds is 0.045 m/s.

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Answer:

volume in Liter = 2.50 L

Explanation:

Given:

Na2CO3 = 0.2 M

Molar mass of Na2CO3 = 106 g/mol

Mass of Na2CO3 solution = 53 gram

Find:

Volume of Na2CO3

Computation:

Number of mol of Na2CO3  = (53 g) / (1.06 x 10² g/mol)

Number of mol of Na2CO3  = 0.5 mol

M = Number of mol / volume in Liter

0.2 = 0.5/ volume in Liter

volume in Liter = 0.5 / 0.2

volume in Liter = 2.50 L