Why is it generally preferable to use absorbance as a meaure of absorption rather than %transmittance?.

Answer:

2FeCl3 + 3H2S → Fe2S3 + 6HCl

Explanation:

Answer:

2 FeCl3 + 3 H2S → 6 HCl + Fe2S3

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hope this will help u buddy.....

The specific rate constant of the second-order irreversible reaction is 122.34 L/mol.s.

A second-order irreversible reaction A-3R was studied in a PFR reactor, where reactant pure A (CAO=0.121 mol/lit) is fed with an inert gas (40%), and flow rate of 1 L/min (space velocity of 0.2 min-1). Product R was measured in the exit gas as 0.05 mol/sec.

To calculate the specific rate constant, we use the following equation:0.05 mol/sec = -rA * V * (1-X). The negative sign is used to represent that reactants decrease with time. This equation represents the principle of conservation of mass.Here, V= volume of the PFR. X= degree of conversion. And -rA= the rate of disappearance of A= k.CA^2.To calculate the specific rate constant, k, we need to use a few equations. We know that -rA = k.CA^2.We can also calculate CA from the volumetric flow rate and inlet concentration, which is CAO. CA = (CAO*Q)/(Q+V)The volumetric flow rate, Q = V * Space velocity (SV) = 1 * 0.2 = 0.2 L/min.

Using this, we get,CA = (0.121*0.2)/(1+0.2) = 0.0202 mol/LNow, we can substitute these values in the equation of rate.0.05 = k * (0.0202)^2 * V * (1 - X)The volume of PFR is not given, so we cannot find the exact value of k. However, we can calculate the specific rate constant, which is independent of volume, and gives the rate of reaction per unit concentration of reactants per unit time.k = (-rA)/(CA^2) = 0.05/(0.0202)^2 = 122.34 L/mol.

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The precise proportion of air to a combustible gas or vapor at which complete combustion occurs is known as the stoichiometric ratio.

To determine the stoichiometry by mass, multiply the quantity of molecules needed for each reactant by its molar mass to get the mass of each reactant per mole of reaction. Divide each by the sum of the reactions to determine the mass ratios.

In the field of chemistry known as stoichiometry, needed quantitative data is ascertained by exploiting relationships between the reactants and/or products of a chemical process. Stoichiometry literally translates as the measure of elements because the Greek words stoikhein and metron both mean element and measure, respectively.

2NH3 (gas) + 5F2 → N2F4 + 6HF

    34g          190g     104g

Quantity of N2F4​ created from 2gNH3 = (104/34) × 2 = 6.12

Quantity of N2F4​ created from 8gF2 = (104​/109) × 8 = 4.38

N2​F4 ​will be limited, and the real product weight is 3.56 g.

Yield % = (Actual product quantity / calculated product quantity) x 100

             = (3.56 / 4.83) x 100

             = 81.28%

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Spheres of power refer to the different areas in which corporations hold influence and power, including economic, political, cultural, and social spheres.

Corporations hold significant power in modern societies, often extending beyond traditional political boundaries. Corporate power is often characterized by the ability to influence public policy, shape public opinion, and control economic markets. Different corporations wield power in different spheres, depending on their size, sector, and geographic location.

Let us consider the example of Apple Inc. to describe the power it wields in different spheres.

Economic Sphere: Apple is one of the world's largest corporations, with a market capitalization of over $2 trillion. It holds significant economic power, controlling a sizable portion of the global smartphone and computer markets. It has been able to leverage its economic power to negotiate favorable trade deals, acquire smaller companies, and invest in research and development.

Political Sphere: Apple has been able to influence public policy through lobbying efforts. For example, it has lobbied for tax breaks and incentives to promote innovation and job creation. Apple has also been involved in high-profile legal battles over privacy concerns and intellectual property rights, with the outcome of these cases having implications for other technology companies.

Cultural Sphere: Apple has a strong brand identity and is often associated with innovation, creativity, and high quality. Its products have become a symbol of status and aspiration for many people, contributing to its cultural power. Apple has also invested in the entertainment industry through its Apple Music and Apple TV+ services, further extending its cultural influence.

Social Sphere: Apple has been able to shape social norms and behaviors through its products and marketing. For example, the iPhone has revolutionized the way people communicate and interact with technology, contributing to the rise of social media and the decline of traditional forms of communication. Apple's marketing campaigns have also had a significant impact on popular culture, influencing fashion trends and consumer behavior.

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This problem is providing information about the loss of mass for a reaction 50 °C as a function of the time elapse. Thus, when taking a look at the given graph, we can trace a horizontal line on the y-axis at 0.95 g in order to intercept it with the curve, and hence, figure out the time at which that loss of mass takes place.

Thus, we can see that when the loss of mass hits 0.95 g, the corresponding time on the graph is about 80 seconds, and hence, the rate of reaction turns out to be:

\(r=\frac{0.95g}{80s}\\\\r=0.012\frac{g}{s}\)

Which has two significant figures as required.

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In this case, a water sample has been diluted to 10^-3, which means it has been diluted by a factor of 1,000 times. So, the correct answer is:

The answer is option b. 300.

When a solution is diluted, it means that more solvent (usually water) has been added to decrease the concentration of the solute. The dilution factor is the ratio of the final volume of the solution to the initial volume of the solution.

In this case, the water sample has been diluted to 10-3, which means that the concentration of the original solution has been reduced by a factor of 10-3.

To calculate the dilution factor, we need to take the reciprocal of the concentration reduction factor:

Dilution factor = 1/10-3 = 1,000

So the water sample has been diluted by a factor of 1,000 times.

Therefore, the correct answer is option b. 300 is not the dilution factor, but rather the concentration reduction factor (1/300), which is the reciprocal of the dilution factor.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.

The rate of any chemical reaction depends upon the nature of the reacting substances.  Under the same conditions , reactions that appear similar have different rates of reaction. Chemical reaction proceeds in different speeds, depend on the various factors such as type of chemical transformation , temperature and other factors. the information about the speed of reaction is useful in large scale production.

Thus, We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.

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The least likely element combination would be hydrogen (H) and sodium (Na) since their ionization energies differ significantly.

To determine the least likely element combination, we need to consider the ionization energies and their relative values. The element combination that is least likely would involve elements with similar or close ionization energies.

Comparing the ionization energies:

1,312 kJ/mol (H) < 1,402 kJ/mol (N) < 1,314 kJ/mol (O) < 496 kJ/mol (Na)

Based on these values, the least likely element combination would be hydrogen (H) and sodium (Na) since their ionization energies differ significantly.

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The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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Answer:

A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion

Explanation:

According to the A.P.E.X. glossary:

A conjugate acid is the form a base takes after it gains a hydrogen ion (or proton), and a conjugate base is the form an acid takes after it loses a hydrogen atom (or proton).

The chemical reaction of the formation of hydrogen iodide is given:

H2(g) + I2(g) = 2HI (g)

As you can see from the equation, only 1 mole of hydrogen and 1 mole of iodine react to form 2 moles of hydrogen iodide

Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

Therefore, the gas was collected at a temperature of 246 K.

It examines four straightforward techniques for gathering gases: floating over water, pouring gases into test tubes or gas jars from below, pouring gases into gas syringes from above.

We can use the ideal gas law, PV = nRT, to solve for the temperature (T) of the gas. Rearranging the equation, we get:

T = PV / nR

where P is the pressure in atm, V is the volume in L, n is the number of moles, R is the ideal gas constant (0.08206 L.atm/mol.K).

Substituting the given values, we get:

T = (0.925 atm)(3.51 L) / (1.350 mol)(0.08206 L.atm/mol.K)

T = 246 K

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Answer:

k

br-

o2- ion

Explanation:

a/k ion has a larger size than k+ ion bc of the size of the radius it is always smaller compared to the parent ion .

b/bc it is an anion and it always has a large size compared to the parent ion (the same thing as the first one)

c/both the anions are isoelectornic species .Since the nuclear charge of O2- ions is small,its size is therefore more than the F- ion

Answer:Calcium carbonate (CaCO3), essentially, is an ionic compound having the bivalent calcium and carbonate ions. But the carbonate anion is a polyatomic species. The carbon atom is bonded to all the three oxygen atoms by covalent bonds - two carbon-oxygen single bonds and one carbon-oxygen double bond.

Explanation:So it's ionic hope this helps u. Btw may i have brainlist plz.

Answer

Explanation

Note: The reaction is a double replacement reaction in which two soluble ionic compounds react in an aqueous solution to form an insoluble solid.

In this case, a solution of sodium carbonate, Na2CO3, will contain

The complete balanced equation that occurs when sodium carbonate is added to hard water is

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Answer:

Distance = 18 meters

Explanation:

Given the following data;

Force = 50 N

Speed = 1.5 m/s

Time = 12 seconds

To find the distance travelled;

Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.

Mathematically, speed is given by the equation;

\(Speed = \frac{distance}{time}\)

Making distance the subject of formula, we have;

Distance = speed * time

Substituting into the formula, we have;

Distance = 1.5 * 12

Distance = 18 meters

Additionally, to find the workdone;

Workdone = force * distance

Workdone = 50 * 18

Workdone = 900 Joules

Nitrogen and oxygen are the elements which will form a covalent bond between them due to small difference in electronegativity.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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The angular momentum of the rotating bar is \(\(3.6807 \, \text{kg} \cdot \text{m}^2/\text{s}\)\)

The angular momentum vector of the rotating bar can be calculated using the formula:

L = Iω,

where L represents the angular momentum, I is the moment of inertia, and ω is the angular velocity.

First, we need to calculate the moment of inertia of the bar. For a uniform rod rotating about an axis through its center, the moment of inertia can be given by:

\(\[ I = \frac{1}{12} m L^2 \]\)

where m is the mass of the rod and L is its length.

the mass of the bar is 350 g (0.35 kg) and the total length is 2.0 m, we can substitute these values into the equation:

\(\[ I = \left(\frac{1}{12}\right) \times 0.35 \, \text{kg} \times (2.0 \, \text{m})^2 = 0.2333 \, \text{kg} \cdot \text{m}^2 \]\)

\(\[ \omega = (120 \, \text{rpm}) \times \left(\frac{2\pi \, \text{rad}}{1 \, \text{min}}\right) \times \left(\frac{1 \, \text{min}}{60 \, \text{s}}\right) = 4\pi \, \text{rad/s} \]\)

Now, we can calculate the angular momentum:

\(\[ L = I \cdot \omega = (0.2333 \, \text{kg} \cdot \text{m}^2) \times (4\pi \, \text{rad/s}) = 3.6807 \, \text{kg} \cdot \text{m}^2/\text{s} \]\)

The angular momentum of the rotating bar is \(\(3.6807 \, \text{kg} \cdot \text{m}^2/\text{s}\)\)

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Answer: According to Boyle's Law, if the temperature remains constant, doubling the pressure will halve the volume of the gas.

Explanation:

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Distance covered in 12 minutes = 18 km, now

Unit rate is equal to :

The train travels 1.5 km in 1 minute time interval.

Answer:

\(\huge\boxed{\sf 1\ minute = 1.5\ kilometers}\)

Explanation:

12 minutes = 18 kilometers

Divide both sides by 12

12/12 minutes = 18/12 kilometers

1 minute = 3/2 kilometers

1 minute = 1.5 kilometers

\(\rule[225]{225}{2}\)

Hope this helped!

Answer:

c20 will be there ok

Explanation:

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a) alpha particles to beta particles b) beta particles  to high-energy gamma rays. c) alpha particles  to beta particles .

a) Nitrogen-16 is a radioactive isotope that undergoes beta decay. In beta decay, a neutron in the nucleus of Nitrogen-16 is converted into a proton, and an electron (beta particle) is emitted. The charged particle emitted by Nitrogen-16 is an electron (beta particle). In air and iron, the range of the emitted beta particles depends on their initial energy and the characteristics of the medium they travel through. Beta particles can range from a few centimeters to several meters in air, while their range in iron is shorter due to the higher density of the material.

Additionally, Nitrogen-16 can also undergo positron emission, where a proton in the nucleus is converted into a neutron, and a positron (antielectron) is emitted. However, since the question specifically mentions charged particles emitted by Nitrogen-16 in air and iron, we focus on the electron (beta particle) emission.

b) Yttrium-90 is another radioactive isotope that undergoes beta decay. Similar to Nitrogen-16, Yttrium-90 emits beta particles (electrons) during its decay. The range of beta particles emitted by Yttrium-90 in aluminum and magnesium is determined by the energy of the particles and the properties of the materials. Beta particles can travel several centimeters to several meters in aluminum and magnesium before losing their energy through interactions with the atoms in the material.

In addition to beta particles, Yttrium-90 also emits high-energy gamma rays during its decay. Gamma rays are electromagnetic radiation and are not charged particles. Their range in materials like aluminum and magnesium depends on their energy and the properties of the medium. Gamma rays can penetrate several centimeters to several meters through these materials.

c) Thorium-232 is a radioactive isotope that undergoes alpha decay, where it emits an alpha particle (helium nucleus). The range of alpha particles emitted by Thorium-232 in air and water is relatively short. Alpha particles have a positive charge and interact strongly with matter. In air, alpha particles can travel only a few centimeters before losing their energy through collisions with air molecules. In water, the range of alpha particles is even shorter due to the denser medium.

It's important to note that the ranges provided here are approximate and depend on various factors such as the energy of the particles, the density of the medium, and the interactions with atoms in the material. The specific range of charged particles emitted by radioactive isotopes can vary in different experimental setups or applications.


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Answer: d) is correct

Explanation:

a) burning trees creates more carbon emissions

b) dead trees cannot turn co2 into oxygen and destroying them releases co2 in wood and soil

c) transpiration from plants creates 10% of the atmosphere's moisture, the rest being oceans, rivers and lakes

55.845 g/mol of the mass of cans in the box we brought had a mass of 23kg. 411.74 mol moles we have.

To determine the number of moles of tin cans you have, we need to know the molar mass of the metal that the cans are made of. Tin cans are usually made of steel, which is an alloy made primarily of iron and carbon, with small amounts of other elements.

To convert the mass of the cans (23 kg) to moles, we need to use the following formula:

moles = mass / molar mass

moles = 23,000 g / 55.845 g/mol = 411.74 mol

Therefore, the number of moles of iron in the 23 kg of tin cans is approximately 411.74 mol.

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