Calculate the number of moles of NH3 formed by the reaction of 2 moles of N2 and 2 moles of H2,N2(g) + 3H2(g) forms 2NH3(g)

Based on the groups in the periodic table, the atom that could represent "x" in the stable molecule LiX, where Li is lithium, would be any atom from Group 17, also known as the halogens.

The halogens include elements such as fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

Lithium, being in Group 1, has a single valence electron that it can donate to another atom to form a stable molecule. The halogens in Group 17 have a valence electron deficiency of one, making them suitable candidates to accept the electron from lithium and form a stable LiX molecule.

Therefore, elements like fluorine (F), chlorine (Cl), bromine (Br), iodine (I), or astatine (At) could represent the atom "x" in the LiX molecule.

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This problem is providing the energy of a photon of light as 2.95 × 10⁻¹⁷ J and it is required to calculate its frequency, according to the electromagnetic spectrum theory. At the end, the answer turns out to be 4.52x10¹⁶ Hz according to the following:

In chemistry, we use the electromagnetic spectrum in order to know how the wavelength, frequency and energy of particles are related to each other. In this particular case, we have a photon and the frequency can be calculated with the following arrangement:

\(E=h\nu\\\\\nu=\frac{E}{h}\)

Whereas E is the energy, h the Planck's constant and ν the frequency. Thus, we plug in these first two to obtain:

\(\nu=\frac{2.95x10^{-17}J}{6.626x10^{-34}J*s}\\\\\nu=4.45x10^{16}s^{-1}=4.45x10^{16}Hz\)

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The expression "minimum energy reactants need in order to start to react" accurately describes activation energy in a chemical reaction.

The expression that correctly describes activation energy in a chemical reaction is the minimum energy reactants need in order to start to react. Activation energy (Ea) represents the energy barrier that must be overcome for a chemical reaction to occur. It is the minimum amount of energy required for reactant molecules to reach the transition state, where old bonds are breaking and new bonds are forming.

In order for a chemical reaction to proceed, reactant molecules must acquire sufficient energy to surpass this energy barrier. The reactants need to collide with enough energy and in the proper orientation to initiate the reaction. The activation energy is specific to each chemical reaction and is determined by factors such as the nature of the reactants and the reaction mechanism.

The activation energy does not represent the total amount of energy consumed by the reaction, as reactions can involve energy changes in multiple steps. It also does not represent the energy given off when reactants collide, as collisions may not always lead to successful reactions.

Additionally, the activation energy is not equivalent to the heat released during the reaction, as heat is a thermodynamic quantity associated with the overall energy change of the reaction.

Therefore, the expression "minimum energy reactants need in order to start to react" accurately describes activation energy in a chemical reaction.

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Arsenic, hydraulic fracturing, lead, and PFAS present chemical threats to global drinking water supplies in different ways.

Let's discuss each of them in detail:

(a) Arsenic - The origin of arsenic exposure is natural deposits or contamination from agricultural or industrial practices. Human health consequences include skin, lung, liver, and bladder cancers. It can also lead to cardiovascular diseases, skin lesions, and neurodevelopmental effects. Drivers of continued exposure include poor regulation and monitoring. Modern solutions include rainwater harvesting and treatment.

(b) Hydraulic fracturing - Hydraulic fracturing involves using a mixture of chemicals, water, and sand to extract natural gas and oil from shale rock formations. The origin of exposure is contaminated surface and groundwater due to the release of chemicals from fracking fluids and other sources. Human health consequences include skin, eye, and respiratory irritation, headaches, dizziness, and reproductive and developmental problems. Drivers of continued exposure include lack of regulation and poor oversight. Modern solutions include alternative energy sources and regulation of the industry.

(c) Lead - Lead contamination in drinking water can occur due to corrosion of plumbing materials. Human health consequences include neurological damage, developmental delays, anemia, and hypertension. Drivers of continued exposure include aging infrastructure and poor maintenance. Modern solutions include replacing lead service lines, testing for lead levels, and implementing corrosion control.

(d) PFAS - PFAS (per- and polyfluoroalkyl substances) are human-made chemicals used in a variety of consumer and industrial products. They can enter the water supply through wastewater discharges, firefighting foams, and other sources. Human health consequences include developmental effects, immune system damage, cancer, and thyroid hormone disruption. Drivers of continued exposure include the continued use of PFAS in consumer and industrial products. Modern solutions include reducing the use of PFAS in products and treatment methods such as granular activated carbon.

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Changes in concentration of reactants can affect the reaction rate by altering the frequency of collisions between particles.

Changes in the concentration of reactants can have a significant effect on the rate of a chemical reaction. In general, increasing the concentration of reactants leads to an increase in the reaction rate, while decreasing the concentration slows down the reaction.

The concentration of reactants determines the frequency of collisions between particles, which is a crucial factor in reaction kinetics. By increasing the concentration, there are more reactant particles available, leading to a higher probability of successful collisions and more frequent formation of product molecules. This results in an overall increase in the reaction rate.

Conversely, decreasing the concentration reduces the number of available reactant particles, leading to a decrease in collision frequency and slower reaction rate.

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concentration changes in a chemical reaction have a significant effect on the reaction rate. Increasing the concentration of reactants increases the frequency of collisions, leading to a faster reaction rate. Conversely, decreasing the concentration of reactants decreases the collision frequency and slows down the reaction rate. Concentration changes can also shift the equilibrium position, favoring the forward reaction and resulting in a faster reaction rate.

concentration changes in a chemical reaction can have a significant effect on the reaction rate. According to the collision theory, for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation. When the concentration of reactants is increased, there are more particles per unit volume, leading to a higher frequency of collisions. This increased collision frequency increases the likelihood of successful collisions, resulting in a faster reaction rate.

On the other hand, decreasing the concentration of reactants decreases the number of particles available for collisions, leading to a lower collision frequency and a slower reaction rate. Therefore, concentration changes directly impact the reaction rate by influencing the frequency of collisions.

Additionally, concentration changes can also affect the reaction rate by altering the equilibrium position of the reaction. In some cases, increasing the concentration of reactants can shift the equilibrium towards the product side, favoring the forward reaction and resulting in a faster reaction rate.

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Answer:

17.78 gm

Explanation:

2 H20 mole weight = 36 gm

   which leads to 32 gm   O2

36 / 32   =  20 / x      x = 17.78 gm

Answer:

3 is the answer.

Explanation:

Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.

Answer:

3

Explanation:

In the aforementioned reaction, hydrogen is required for 50.0 g ion nitrogen to completely react, hence 10.80 g of hydrogen are required. This indicates that 0.5 moles or barium chloride and 1 mole or silver chloride will combine to generate 1 mole ion silver chloride.

The mole ratio based just on stoichiometric coefficients can be used to calculate how much hydrogen gas will totally react with nitrogen after we have the chemical equation that is balanced. In order for hydrogen and nitrogen to totally react, 7.8 moles are required.

A double displacing reaction occurs when silver nitrate and barium chloride are combined. They swap ionic components in this process. The end results would then be barium nitrate and silver chloride.

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Based on the information provided, we can infer that the solution is either acidic or neutral since phenolphthalein turns colorless in acidic solutions and phenol red turns red in neutral or slightly basic solutions.

Therefore, the pH of the solution could be between 7 (neutral) and 4.5 (the pH at which phenolphthalein turns colorless). Without further testing or information, it is impossible to determine the exact pH of the solution.

Phenolphthalein turns colorless in acidic solutions (pH < 8.2) and phenol red turns red in acidic solutions (pH < 6.8). Since both indicators show a color change consistent with an acidic solution, the pH of the unknown solution is likely below 6.8.

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A solution of unknown pH was tested with two indicators: phenolphthalein and phenol red.

Phenolphthalein turns colorless and phenol red turns red. To determine the possible pH of the solution, let's examine the color changes of these two indicators at different pH levels.

Phenolphthalein is colorless in acidic solutions (pH < 8.2) and turns pink in basic solutions (pH > 8.2). Since it is colorless in your solution, the pH must be less than 8.2.

Phenol red turns yellow in acidic solutions (pH < 6.8), red in neutral solutions (around pH 6.8 to 8.0), and orange or pink in basic solutions (pH > 8.0). Since it turns red in your solution, the pH must be between 6.8 and 8.0.

Considering both indicators' color changes, the possible pH of your solution could be between 6.8 and 8.0.

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Answer:

136.36 mL

Explanation:

Here we have to use the dilution formula

From C1V1= C2V2

Where;

C1= initial concentration of the solution= 12.0 M

C2= final concentration of the solution= 2.20 M

V1 = initial volume of the solution= 25.0 ml

V2= final volume of the solution= ?????

Then recall;

C1V1=C2V2

V2 = C1V1/C2

Substituting values from the parameters given;

V2= 12.0 × 25.0 / 2.20

V2= 136.36 mL

Answer:

They can detect differences in temperature

What makes thermal imaging cameras useful is that, they can detect differences in temperature.

A thermal imaging camera is a type of the thermographic camera used in firefighting.

It functions by rendering infrared radiation as visible light and allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers based on difference in temperature.

Thus, what makes thermal imaging cameras useful is that, they can detect differences in temperature.

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Answer:

Regulation of body temperature

Explanation:

The volume of gas in the tank is determined as 1.78 L.

The volume of gas in the tank is calculated by applying idle gas law as follows;

PV = nRT

where;

n = reacting mass / molar mass

n = (300 g) / (3 x 16 g)

n = (300 g) / (48 g/mol)

n = 6.25 moles

The volume of the gas is calculated as follows;

V = nRT/P

V = (6.25 x 8.314 x 214.25)/(6250)

V = 1.78 L

Thus, the volume of ideal gas increases with increase in temperature.

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There are several functional groups that are found in organic molecules, such as hydroxyl group, carbonyl group, carboxyl group, amino group and phosphate group.

One important functional group is the hydroxyl group, which is represented by the formula -OH. This group is found in alcohols, such as ethanol, and is important for their solubility in water and ability to form hydrogen bonds. Another functional group is the carbonyl group, which is represented by the formula -C=O. This group is found in aldehydes and ketones, and is important for their reactivity in chemical reactions. The carboxyl group, represented by the formula -COOH, is found in carboxylic acids and is important for their acidic properties.
The amino group, represented by the formula \(-NH_2\), is found in amino acids and is important for their ability to form peptide bonds and create proteins. Finally, the phosphate group, represented by the formula \(-PO_4\), is found in nucleotides and is important for their role in DNA and RNA synthesis.

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To determine the \(Al_3^+:Ag^+\) concentration ratio in the electrochemical cell, the Nernst equation is used. By solving the equation, the ratio is found to be 1/27, which corresponds to option A (0.0094:1).

To determine the \(Al_3^+:Ag^+\) concentration ratio in the given electrochemical cell, we need to use the Nernst equation, which relates the cell potential (Ecell) to the concentrations of the species involved. The Nernst equation is given by:

Ecell = E°cell - (RT/nF) * ln(Q)

In this case, the balanced redox equation is:

\(Al(s) + 3Ag+(aq)\) → \(Al_3+(aq) + 3Ag(s)\)

The number of electrons transferred (n) is 3.

Since the reaction is at standard conditions (25°C), we can assume that E°cell = 0.59 V (retrieved from standard reduction potentials).

Plugging the values into the Nernst equation:

2.34 V = 0.59 V - (8.314 J/(mol·K) * (298 K) / (3 * 96485 C/mol) * ln(Q)

Simplifying the equation:

1.75 V = ln(Q)

Taking the exponential of both sides:

\(Q = e^{(1.75)}\)

Now, Q represents the concentration ratio of products to reactants. The ratio of \(Al_3^+\) to \(Ag^+\) is 1:3, based on the balanced equation. Therefore:

\(Q = [Al_3^+]/[Ag^+]^3 = 1/3^3 = 1/27\)

Comparing this to the options given, the closest ratio is 0.0094:1 (option A).

Therefore, the correct answer is A) 0.0094:1.

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Answer: 46.875%

the moles of C2H6 is 32/(12.2+6) = 16/15 (mol)

the moles of CO2 is 44/(12 + 16.2) = 1 (mol)

have:

2C2H6 + 7O2 ⇒ 4CO2 + 6H2O

 0,5    <=                 1

=> C2H6 reacts 0.5 mol

=> H = \(\frac{0.5}{\frac{16}{15} }.100=46.875\)%

Explanation:

The given statement " in valence bond theory, covalent bonds are described in terms of the overlap of atomic or hybrid orbitals" is true.

In quantum mechanics, the valence bond (VB) theory is a model for describing chemical bonding. The Valence Bond Theory (VBT) explains how atoms combine to form molecules by sharing electrons, resulting in the formation of covalent bonds. The VBT explains the role of hybridization, which is when atomic orbitals combine to form hybrid orbitals that allow for the formation of covalent bonds.

Hybridization of atomic orbitals leads to the formation of new orbitals that describe the geometry of the bonding. The overlap of atomic or hybrid orbitals describes covalent bonding in VBT. The probability density of the orbitals is high, meaning the electrons are most likely to be found in the region of overlap, leading to the formation of a covalent bond.

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Answer:

Moles= 11/44 = 0.25 molesof CO2. Click to see full answer Considering this, how many moles of carbon are in 1 mole of co2? A mole of CO2molecules (we usually just say “a mole of CO2”) has one moleof carbonatoms and two molesof oxygen atoms.

Exxplanation:

A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the  molecular formula is C₂H₂ ethyne

Molecular formula of compound is (CH)n and the given molar mass is 26g/mol

Molar mass of (CH)n, C=12=n(12+1)=13n

So 13n and n=2

=13×2=26 and given molar mass is also 26g/mol

So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne

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{The prediction will be, I2 will be found mainly in the top layer because it will dissolve more in the C6H14(l). The correct option is C.

When C6H14(l) and H2O(l) are mixed, they form two separate layers due to their difference in density. Since the density of C6H14(l) is lower than that of H2O(l), it will form the top layer, while the denser H2O(l) will form the bottom layer. When I2(s) is added to the mixture and shaken again, it will dissolve mainly in the layer in which it is more soluble.

I2 is more soluble in C6H14(l) than in H2O(l), so it will dissolve more in the top layer of C6H14(l). Therefore, the best prediction is that I2 will be found mainly in the top layer because it will dissolve more in the C6H14(l) (Option C).

Iodine (I2) is a nonpolar substance, and it is more likely to dissolve in the nonpolar hexane (C6H14) than in the polar water (H2O). Since hexane is less dense (0.66g/mL) than water (1.00g/mL), it will form the top layer, and thus, the iodine will mainly dissolve in the top layer.

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Answer:

To make proteins....

It is used to make amino acids in our body which in turn make proteins.

Explanation:

hope it was helpful.....

Answer: B. C and A.

Explanation:

Answer: so the answer is A

Explanation: The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is F=ma. ... This law requires that the direction of the acceleration vector is in the same direction as the force vectors.

Answer:

168.75 ml

Explanation:

M1V1=M2V2

375ml*.45M=1M*V2