If you want to make more shells (CaCO3) then which direction should the reaction proceed?

The change in enthalpy for the reaction 2 b (s) + 3 h₂ (g) → b₂h₆ (g) is equal to the difference between the enthalpy change of Equation 2 (ΔH₂) and the enthalpy change of Equation 1 (ΔH₁).

To determine the change in enthalpy for the given reaction.

we can use Hess's Law, which states that the overall enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual steps or reactions involved.

Given the following thermochemical equations:

b₂h₆ (g) + 3 o₂ (g) → b₂o₃ (s) + 3 h₂o (g) ∆H₁

We need to manipulate this equation to match the desired reaction

2 b (s) + 3 h₂ (g) → b₂h₆ (g) ? (ΔH₂)

To obtain Equation 2, we need to reverse Equation 1 and multiply it by 2:

b₂o₃ (s) + 3 h₂o (g) → b₂h₆ (g) + 3 o₂ (g) -ΔH₁

Now, we can add Equations 2 and 3 to obtain the desired overall equation:

2 b (s) + 3 h₂ (g) → b₂o₃ (s) + 3 h₂o (g) ΔH₂ - ΔH₁

Therefore, the change in enthalpy for the reaction 2 b (s) + 3 h₂ (g) → b₂h₆ (g) is equal to the difference between the enthalpy change of Equation 2 (ΔH₂) and the enthalpy change of Equation 1 (ΔH₁).

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Complete question: what is the change in enthalpy for the reaction: 2 b (s) 3h2 (g) → b2h6 (g) given these thermochemical equations? b2h6 (g) 3 o2 (g) → b2o3 (s) 3 h2o (g) ∆h. Determine the change in enthalpy for the reverse reaction: B2H6 (g) → 2B (s) + 3H2 (g).

The electron will move to 2nd energy level as n = 2

An energy level (also called an electron shell) is a fixed distance from the nucleus at which an electron can exist. Electrons are small, negatively charged particles in atoms that move around a central, positive nucleus. Energy levels are a bit like stair steps. The energy emitted at a particular transition is equal to the energy difference between the two energy levels.

E(n) = −1/n² × 13.6eV

For the given case,

λ = 410.2 nm

h = 6.62 × 10⁻³⁴ j h⁻¹

c = 3 × 10⁸

E = hc/λ

E =  6.62 × 10⁻³⁴× 3 × 10⁸/410.2 × 10⁻⁹

E = 0.048 × 10⁻¹⁷ joules

E = 2.99 eV

E = -13.6 1/n²

Since, n = 6

E =  -13.6 1/6²

E = -0.38 eV

ΔE = E₂ - E₁

2.99 = -0.38 - E

-3.37 = E

-3.37 = -13.6 1/n²

n = 2

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Answer:

Its a or d if im stupid my b

Explanation:

Binary ionic compounds consist of atoms of only two atoms  and hence the term binary is given to them.

Ionic compounds or electrovalent compounds are  the type of compounds which are  formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond and the compound is called ionic compound.

When the compounds consist of atoms  of only two elements the compound is called as a binary ionic compound.

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Answer:

Kelvin

Explanation:

Kelvin is the most suitable for measuring the heat of the sun because it is an absolute temperature scale and does not have a negative range, which makes it convenient for high temperature measurements. The temperature of the sun's surface ranges from about 5,500 to 6,000 K, so it would not be possible to measure it accurately using Celsius or Fahrenheit, which are relative temperature scales with a negative range.

Correct me if I’m wrong.

Answer:0.213 J/g°C

Explanation:

To calculate specific heat of the metal, the formula is used:

Q = m × c × ∆T

Where Q = amount of heat

m = mass

c = specific heat

∆T = change in temperature

Explanation:

Answer:

A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits

The molarity of a solution with 952 grams of ammonium carbonate dissolved to make 1750 ml of solution is: 0.54 mol/L.

The molarity of a solution can be calculated by dividing the amount of solute (in this case ammonium carbonate) by the volume of the solution. In this case, 952 grams of ammonium carbonate are dissolved in 1750 mL of solution. Therefore, the molarity of the solution can be calculated as follows:

Molarity = (952 g ammonium carbonate) / (1750 mL solution) = 0.54 mol/L

To calculate the molarity, first, we need to calculate the moles of ammonium carbonate. We can do this using the molar mass of ammonium carbonate, which is 53.49 g/mol. We divide the mass of ammonium carbonate by its molar mass to get the number of moles:

(952 g ammonium carbonate) / (53.49 g/mol) = 17.77 mol

Then, we divide this number by the volume of the solution (in liters):

(17.77 mol) / (1750 mL/1000 mL/L) = 0.54 mol/L

Therefore, the molarity of the solution is 0.54 mol/L.

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Fresh air contains approximately 300 ppm CO2, whereas the breath of an intoxicated person contains about 3 percent CO2. The amount of CO2 in the breath of an intoxicated person is 100 times the amount of CO2 in fresh air.

How many times the amount of CO2 is in the breath of an intoxicated person as compared to fresh air? The amount of CO2 in the breath of an intoxicated person is 100 times the amount of CO2 in fresh air. Key Points Carbon dioxide concentration in fresh air is approximately 300 ppm. The carbon dioxide concentration in the breath of an intoxicated person is roughly 3 percent of the total volume of exhaled air. Calculation: We are given that the concentration of carbon dioxide in fresh air is roughly 300 ppm.

We are also told that the concentration of carbon dioxide in the breath of an intoxicated person is roughly 3 percent of the total volume of exhaled air. To calculate the answer, we can use the fact that 1 percent is the same as 1/100 or 0.01. As a result, we can convert the percent value to a decimal by dividing by 100.Therefore, 3 percent of the total volume of exhaled air is 0.03. Next, we can compare this value to the concentration of carbon dioxide in fresh air, which is roughly 300 ppm.

To do so, we will divide the concentration of CO2 in the breath of an intoxicated person by the concentration of CO2 in fresh air:0.03 / (300 ppm) = 0.0001 or 1/10000.1/10000 is the same as 1/1000 x 1/10. So, 1/10 is the same as 10/100. Therefore,1/1000 x 10/100 = 10/1,000= 1/100 times or0.1 times

In conclusion, the amount of CO2 in the breath of an intoxicated person is 100 times the amount of CO2 in fresh air.

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Answer:

4NO2 + 2Na2O + O2 → 4NaNO3

A). The statement is True, Ammonium, sodium, and nitrate are all spectator ions. due to the fact all salts of ammonium and sodium are soluble in water.

B). The statement is false, if you blend potassium iodide and silver nitrate the precipitate that forms may be potassium nitrate. due to the fact potassium nitrate is soluble in water. therefore it's going to no longer shape precipitates.

C). The declaration is proper, In 1M ammonium hydroxide solution, hydroxide can react with a few cations to form precipitates.

D). The assertion is proper, Ammonium nitrate will react with sodium carbonate to form sodium nitrate (a precipitate). because sodium nitrate is soluble in water. consequently it will no longer shape precipitates.

E). The declaration is false, Hydroxide, carbonate, and phosphate are constantly spectator ions. because a few salts of Hydroxide i.e. Mg(OH)2, carbonate i.e. MgCO3, and phosphate i.e. Mg3(PO4)2 are insoluble in water. consequently they do not continually shape spectator ions.

Spectator ions are ions that are found in a response but do now not take part in the actual chemical response. alternatively, they stay in the answer and aren't fed on or produced during the response. while spectator ions won't be directly involved in the response, they could nonetheless have an effect at the reaction's typical conduct. this is due to the fact they can affect the ionic strength of the answer and influence the rate of the reaction.

Spectator ions are commonly either cations (positively charged ions) or anions (negatively charged ions) that are not concerned in forming the precipitate, acid, or base. they may be usually observed in ionic compounds and may be diagnosed via searching on the ionic equation for the response.

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Complete Question:

True & False:

(A)Ammonium, sodium, and nitrate are all spectator ions.

(B)If you mix potassium iodide and silver nitrate the precipitate that forms will be potassium nitrate.

(C)In 1M ammonium hydroxide solution, hydroxide can react with some cations to form precipitates.

(D)Ammonium nitrate will react with sodium carbonate to form sodium nitrate (a precipitate).

(E)Hydroxide, carbonate, and phosphate are always spectator ions.

Energy is inversely proportional to the wavelength of a wave. Which would have the GREATEST energy. A wave with a wavelength of  5  meters.

The relationship between wavelength and energy is given as :

E = hf

E = h c / λ

where,

E = energy

h = Planck constant

c = speed of light

λ = wavelength

So, energy is inversely proportional to wavelength,  therefore, the wave having least amount of wavelength will have greatest amount of energy. So, according to the given value . the wavelength 5 m will have greatest energy.

Thus, Energy is inversely proportional to the wavelength of a wave. Which would have the GREATEST energy. A wave with a wavelength of  5  meters.

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Answer:

Convection currents are a circular current caused by the difference in temperatures from the bottom to the top of the mantle. It is because of these currents that the plates of the Earth have moved in the past and are moving today. These plate movements cause earthquakes, mountain building, and volcanism.

Explanation:

The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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Answer:

I guess the 1st one idk

Consider the following reaction:

A→2C

The average rate of appearance of C is given by delta C/delta t. Comparing the rate of appearance of C and the rate of disappearance of A we get delta C/delta t = -2 x (-delta A/delta t)

The given reaction is A → 2C, which means that A is being converted into 2 moles of C. To determine the rate of appearance of C, we need to calculate the change in concentration of C over time. This can be represented as delta C/delta t.
To compare the rate of appearance of C with the rate of disappearance of A, we need to calculate the rate of disappearance of A. Since A is being converted into 2 moles of C, the rate of disappearance of A can be represented as -delta A/delta t.
Now, we need to compare the rate of appearance of C with the rate of disappearance of A. As we know that two moles of C are formed for every mole of A that disappears, the rate of appearance of C will be twice the rate of disappearance of A.

This means that delta C/delta t is equal to -2 x (delta A/delta t).
Therefore, we can conclude that the rate of appearance of C is equal to negative two times the rate of disappearance of A.

This relationship holds true for any reaction where one reactant is converted into multiple products. By using the stoichiometry of the reaction, we can easily relate the rates of appearance and disappearance of different species in the reaction.

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Answer:

Chronic traumatic encephalopathy (CTE) is a progressive brain condition that's thought to be caused by repeated blows to the head and repeated episodes of concussion. It's particularly associated with contact sports, such as boxing or American football.

Explanation:

When introduced to water, an Arrhenius acid raises overall concentration of Hydrogen ion ions in the solution. These H+ ions combine to create the hydronium ion (H3O+).

An Arrhenius base increases the concentration or hydroxide (OH-) ions while an Arrhenius acid increases the concentration if hydrogen (H+) ions in an aqueous solution. Because of this, an Arrhenius acid-base reaction is a neutralisation reaction when an acid as well as a base interact.

According to Arrhenius, bases are hydroxide compounds who dissociate to produce OH- ions in the presence of water, whereas acids are helium compounds that do the same.

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Answer:Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. This flow transfers heat from one part of the fluid to another. Heat transfer by convection is caused by differences of temperature and density within a fluid

Answer:

A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification.

Explanation:

The process in the petroleum industry involves bringing oil and gas to the surface, converting crude oil into other products, and selling those products to customers. The correct choice is B. upstream; downstream.

In the petroleum industry, the process can be divided into three main sectors: upstream, midstream, and downstream. Upstream activities involve the exploration and extraction of crude oil and natural gas from underground reserves. This includes locating oil and gas deposits, drilling wells, and bringing the oil and gas to the surface.

Once the oil and gas are extracted, the midstream sector comes into play. Midstream activities involve the transportation, storage, and processing of the crude oil and natural gas. This includes pipelines, storage tanks, and facilities that separate the oil and gas into different components.

Finally, the downstream sector involves refining the crude oil into various products and selling those products to end consumers. Downstream activities include refining, petrochemical production, distribution, and marketing of the final petroleum products, such as gasoline, diesel, jet fuel, lubricants, and various other chemicals.

Therefore, in the given scenario, the correct choice is B. upstream; downstream, as it represents the process of bringing oil and gas to the surface (upstream) and then converting crude oil into other products and selling them to customers (downstream).

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Marathon runners well exhibit the differences between the behavior of molecules in different states of matter.

At the starting point before the start of the race, the runners would gather in a common place before the starting line. They would be close to each other and are tightly packed like solid molecules.

After the race was started, some players would start to move fast and some remain in a group for a certain period. They were loosely packed compared to solid.

As the game reaches the end point, the players would be more spread out based on their stamina. They would be more loosely packed compared to solid and liquid.

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Answer:   Ionic Bonds

"When it forms the nitride ion, it gains three electrons to form a 3- ion: N3− . In ionic compounds, the charges of constituent ions must balance. This can be achieved by having three sodium ions per nitride ion. Therefore, the formula of sodium nitride is Na3N"

Explanation:

https://socratic.org/questions/what-is-the-formula-for-sodium-nitride#:~:text=When%20it%20forms%20the%20nitride,nitride%20is%20Na3N%20.

Items that are less useful, relevant, or efficient are likely to be modified or discarded more frequently than those that are deemed more valuable or necessary.

It is more probable that something will be changed or abandoned when it becomes antiquated, ineffective, or does not satisfy the demands of its users. This could be the result of developments in technology, modifications in society's values or tastes, or just the passage of time. Less value or required things or ideas will probably be changed or rejected more frequently since they are not as crucial to success in general or day-to-day life. To ensure their future relevance and usefulness, those that are highly appreciated or thought necessary will probably be kept or improved upon. This idea may be applied to a variety of things, including corporate procedures, cultural customs, and home appliances.

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Chemical reactions are the conversions of starting substances known as reactants into new substances known as products. During chemical reactions, bonds between atoms in the reactants are broken, and new bonds are formed to create new products.

A reaction rate is the change in concentration of a reactant or product per unit of time. A reaction rate expression is a mathematical representation of the rate of a chemical reaction, expressed in terms of the concentrations of the reactants and products. The following equation represents the reaction between H2(g) and Cl2(g) to produce 2HCl(g):H2(g) + Cl2(g) → 2HCl(g)

The rate law for this reaction is rate

= Δt/Δ[H2]

= Δt/Δ[Cl2]

= Δt/Δ[HCl]

Here, the coefficients indicate the number of molecules of each reactant or product involved in the reaction. The brackets denote the concentration of the substance in moles per liter. The rate of a chemical reaction depends on the rate-determining step, which is the slowest step in the reaction mechanism. The rate law is only valid for the specific reaction it describes. Thus, a rate law is different for each reaction.

A rate law can be used to determine the order of the reaction with respect to each reactant, the overall order of the reaction, and the value of the rate constant. The rate constant is a proportionality constant that relates the rate of a chemical reaction to the concentration of reactants. The rate constant is temperature-dependent, and its units depend on the order of the reaction.

The rate constant can be used to predict the rate of a chemical reaction under different conditions. The rate constant is calculated from the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and pre-exponential factor of the reaction.

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The volume of the stock solution she should transfer to a 100 ml volumetric flask is 25 ml.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample = 2.0 m

V₁ = initial volume of sample

C₂ = final concentration after dilution = 0.50 m

V₂ = total final volume after dilution = 100 ml

Plug in the values to the formula and solve for the volume of the stock solution needed in the dilution.

C₁V₁ = C₂V₂

V₁ = C₂V₂/C₁

V₁ = (0.50 m)(100 ml)/(2.0 m)

V₁ = 25 ml

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When an atom forms an ion, it either gains or loses electrons. Ions that have gained one or more electrons are called anions, while ions that have lost one or more electrons are called cations.

The ion formed from aluminum would be smaller than the neutral aluminum atom. Ions form when an atom either gains or loses electrons. The size of an ion varies depending on the number of electrons it has lost or gained. Ions with a positive charge are called cations, while ions with a negative charge are called anions. Aluminum forms a cation when it loses three electrons to form the ion Al³⁺.

A cation is a positively charged ion formed by the loss of one or more electrons from an atom. Cations are smaller than their parent atoms because they have fewer electrons. Because the aluminum ion, Al³⁺, has lost three electrons, it is smaller than the neutral aluminum atom. Therefore, the ion formed from aluminum would be smaller than the neutral aluminum atom.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 0.82 g/mL

volume = 5500 mL

We have

mass = 0.82 × 5500

We have the final answer as

Hope this helps you

HBr + KOH = KBr + H2O is the net ionic equation for the reaction between potassium hydroxide and hydrobromic acid.

In a chemical equation called an ionic equation, the electrolytes in aqueous solution are expressed as dissociated ions.

As a result of the reaction between hydrobromic acid and potassium hydroxide, potassium bromide and water are produced.

HBr ⇒ H⁺ + Br⁻

KOH ⇒ K⁺ + OH⁻

Then equation becomes,

HBr + KOH ⇒   H⁺ + Br⁻ + K⁺ + OH⁻

In this case, the water molecule is created via the reaction of the H+ ion and OH. While the KBr molecule is created when the K+ ion and Br ion react.

Hence, the net balanced ionic equation when hydrobromic acid reacts with potassium hydroxide becomes-

HBr + KOH = KBr + H₂O.

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Answer

The new substances often have different combinations of atoms different from the reactants.

Explanation

The reactants and the new substances in a chemical reaction contain the same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the new substances. This makes the products new substances that are chemically different from the reactants.