4 NH3 + 6 NO → 5 N2 + 6 H2O. How many moles of NO are required to completely react with 2.45 mol NH3? Show all of your work as well as the answer with the proper units.

If a large leak of refrigerant occurs in an enclosed area and no self-contained breathing apparatus is available, the immediate action should be to evacuate the area to fresh air, shut off the source of the leak if possible, and seek medical attention if experiencing symptoms.

If a large leak of refrigerant occurs in an enclosed area and no self-contained breathing apparatus is available, there are several actions that should be taken to ensure safety:

It is important to prioritize personal safety and seek professional assistance when encountering such incidents.

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Answer:

The radioactive element will be left at 2 p.m. will be 0.25 g.

Explanation:

Half life of the radioactive element =[tex]t_{\frac{1}{2}}=1 hour[/tex]

Initial concentration of the radioactive element = [tex]N_o[/tex]=1.0 g

Time elapsed = 12:00 pm to 2:00 pm = 2 hours

Concentration of radioactive element left = N

[tex]\lambda =\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{1 hr}=0.693 hr^{-1}[/tex]

[tex]\log N=\log N_o-\frac{\lambda t}{2.303}[/tex]

Putting the given values in the above equation we get:

N = 0.25 gram

The radioactive element will be left at 2 p.m. will be 0.25 g.

Answer:

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion.

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

[tex]K=\frac{3nRT}{2}[/tex]

K= kinetic energy

n= number of moles

R= gas constant

T= temperature  

[tex]4265J=\frac{3\times 1\times\times 8.314\times T}{2}[/tex]

[tex]T=342K[/tex]

[tex]tK=(t-273)^0C[/tex]

[tex]T=342K=(342-273)^0C=69^0C[/tex]

Thus temperature will be [tex]69^0C[/tex]

The given reactions are balanced, with the first reaction not requiring any adjustment and the second reaction being balanced as 2CrO42-(aq) + 3N2O(g) → 6Cr3+(aq) + 3NO(g). The oxiding agents are ClO3¯ and CrO42- for the first and second reactions, respectively. The reducing agents are BH4¯ and N2O for the first and second reactions, respectively.

First, it's essential to know that during oxido-reduction reactions, one substance loses electrons (oxidized) and another gains them (reduced). We call the substance oxidized to be the reducing agent and the one reduced to be the oxidizing agent.

For the first reaction BH4¯(aq) + ClO3¯(aq) → H2BO3¯(aq) + Cl¯(aq), there aren't any charges or states of matter to be balanced. Analyzing the oxidation states, the B in BH4¯ goes from -3 to +3, showing it has been oxidized. Thus, BH4¯ is the reducing agent. ClO3¯ reduces to Cl¯, thus ClO3¯ is the oxidizing agent.

Moving on to the second reaction CrO42-(aq) + N2O(g) → Cr3+(aq) + NO(g), balance the equation first by adjusting coefficients to get 2CrO42-(aq) + 3N2O(g) → 6Cr3+(aq) + 3NO(g). This reaction is in an acidic solution, so it's important to note that hydroxide ions do not appear in half-reactions occurring in an acidic solution. SO, in this reaction too, Cr in CrO42- goes from +6 to +3, signifying reduction, making CrO42- the oxidizing agent. N in N2O goes from +1 to +2 which signifies oxidation, marking N2O as the reducing agent.

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Electronegativity in water creates partial charges, causing polarity. This polarity allows hydrogen bonding between water molecules, enhancing interactions.

In a water molecule (H₂O), oxygen is more electronegative than hydrogen. This means that oxygen attracts the shared electrons in the O-H bonds more strongly than hydrogen does.

As a result, the electrons spend more time closer to the oxygen atom, giving it a partial negative charge (δ−), while the hydrogen atoms acquire a partial positive charge (δ+). This uneven distribution of charge creates a dipole moment, making water a polar molecule.

The polarity of water molecules causes them to be attracted to each other. The partial positive charge of one water molecule is attracted to the partial negative charge of another, forming hydrogen bonds.

These bonds are relatively weak compared to covalent bonds but are crucial for water’s unique properties, such as its high boiling point and surface tension.

The elements with the least chances to attract electrons from the other atoms are group 1 elements. Thus option A is correct.

The elements attract or lose electrons in order to attain a stable configuration. The system has been based on the number of valence electrons in the atom.

The atom with the least electronegativity has the changes to give up the electrons, and the least chance to attract the electrons from the other atoms.

The group 1 elements have 1 valence electrons, and thus have the high chances to give the electron, with the least chances to attract electrons from the other compounds. Thus option A is correct.

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Answer:

5 subshells

Explanation:

Among all the given options, the correct option is option B. Spreading of a strong fragrance of perfume in a room is a spontaneous process.

A spontaneous process refers to one that happens by itself, without external energy input. A ball would roll down an incline, water will flow downward, melting ice into water, radioactive elements will degrade, and iron will rust, for instance.

A nonspontaneous process is the opposite of a spontaneous process; it requires the addition of energy to take place. For instance, rust doesn't spontaneously transform back into iron; a daughter isotope cannot return towards its parent state. Spreading of a strong fragrance of perfume in a room is a spontaneous process.

Therefore, the correct option is option B.

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The spontaneous process among the options is the spreading of a strong fragrance of perfume in a room, driven by diffusion. The other processes require external energy to occur and are not spontaneous.

Among the processes listed, the only spontaneous process is the spreading of a strong fragrance of perfume in a room. This is due to the natural tendency of particles to move from an area of higher concentration to an area of lower concentration, a process driven by diffusion.

The other processes mentioned are not spontaneous and require external energy to occur:

Titration is the process that measures the amount of a solution of known concentration required to react with a measured amount of a solution of unknown concentration.

The process that measures the amount of a solution of known concentration required to react with a measured amount of a solution of unknown concentration is called titration. Titration is a quantitative chemical analysis method that involves measuring the volume of a reactant solution required to completely react with the analyte in a sample. The volume of the titrant solution is used to calculate the concentration of the analyte using the stoichiometry of the titration reaction.

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The problem is about diluting a 15% acetic acid solution to a larger volume. After diluting the solution from 250 ml to 500 ml, the new percentage concentration of the acetic acid solution is 7.5%. Hence, the label should read 7.5% acetic acid.

The problem you presented is a typical one in chemistry, which involves the concept of percentage concentration and dilutions. Initially, we have 250 ml of a 15% acetic acid solution. The amount of acetic acid in the solution is therefore 0.15 * 250 = 37.5 g.

The technician adds enough water to the solution to make the total volume 500 ml. However, the amount of acetic acid doesn't change; it remains 37.5g. To find the new percentage of the acetic acid solution, we take the total mass of the acetic acid (37.5g) and divide it by the total volume of the solution (500 ml), then multiply by 100% to get the percentage:

(37.5g / 500ml) * 100% = 7.5%.

So, the label on the solution should say 7.5% acetic acid.

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The central atom in the ClF4 ion has three nonbonded electron pairs and one bonded electron pair in its valence shell.

The central atom in the ClF4 ion has three nonbonded electron pairs and one bonded electron pair in its valence shell. The Cl atom has a total of seven valence electrons and forms four covalent bonds with the four fluorine atoms. This leaves three lone pairs of electrons around the central Cl atom, which are not involved in bonding.

The energy difference for a transition in the Paschen series from the higher energy shell n=4 is approximately 13.6 eV.

The energy difference for a transition in the Paschen series can be calculated using the equation:

AE = E1 - E2 = 2.179 × 10-18 J

To express the answer in eV, we can use the conversion factor: 1 eV = 1.6022 × 10-19 J

Therefore, the energy difference for the transition in the Paschen series from the higher energy shell n=4 is approximately 13.6 eV.

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Final answer:

To find the limiting reagent between hydrogen and oxygen, we convert their masses to moles and use the stoichiometry of the balanced chemical reaction 2 H2 + O2 → 2 H2O. Oxygen is the limiting reagent because there are not enough moles of O2 to fully react with the available moles of H2.

Explanation:

To determine the limiting reagent when 4.0 g of hydrogen (H2) and 10.0 g of oxygen (O2) are mixed to react according to the equation 2 H2 + O2 → 2 H2O, we need to perform mass-mole calculations for both reactants and compare the stoichiometry of the balanced equation.

First, convert the mass of each reactant to moles:

For H2: Molecular weight is approximately 2.02 g/mol. Thus, 4.0 g H2 ÷ 2.02 g/mol = 1.98 moles of H2.

For O2: Molecular weight is approximately 32.00 g/mol. Thus, 10.0 g O2 ÷ 32.00 g/mol = 0.3125 moles of O2.

According to the balanced equation, 2 moles of H2 react with 1 mole of O2. Therefore, to fully react with 1.98 moles of H2, we would need 0.99 moles of O2. However, we only have 0.3125 moles of O2, which is insufficient to react with all the H2. Therefore, O2 is the limiting reagent.

The number of moles of HNO3 present is 5.00×10^-2 mol.

In the given neutralization reaction:

Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H₂O(1)

It's clear that 2 moles of HNO3 are needed to neutralize 1 mole of Ba(OH)2. Therefore, if 2.50×10−2 mol of Ba(OH)2 was needed to neutralize the acid solution, we can calculate the number of moles of HNO3 as follows:

Number of moles of HNO3 = 2.50×10−2 x 2 = 5.00×10−2 mol

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Soaps are made by the process saponification. Soaps contains long chain fatty acids and glycerol. The oily nature of soaps are due the presence of fatty acids.

Saponification is the process, making of soaps from glycerol and fatty acids. Therea are different types of soaps based on the ionic nature of the long chain fatty acids.

There are alkaline soaps in which the acidic chain possess a negatively charged group and acidic soaps are those bearing positively charged ions. The nature of sopas can be varied as per the use also.

Fatty acids are long chain hydrocarbons formed by the combination of simple hydrocarbons and they will reacts easily with alcohols forming esters of fatty acids that are soaps.

Hence, the presence of fatty acids make the soaps oily in nature and move gains friction in our hand.

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To find the luminous intensity this formula is used;

Luminous intensity = illuminance ×  [tex]radius ^{2}[/tex]

∴ Lv = Ev × [tex] r^{2}[/tex]

We know the luminous intensity is 100 candelas and the illuminance is 4 lux.

∴ 100 = 4 x  [tex] r^{2}[/tex]

∴ 100/4 =  [tex] r^{2}[/tex]

∴ 25 =  [tex] r^{2}[/tex]

∴ r =√25 = 5 meters

Therefore, the surface will be at a distance of 5 meters from the source.

Answer:

Anode

Explanation:

A p e x

The guy that said cathode was wrong :(

An alkene is a hydrocarbon with one or more carbon-carbon double covalent bonds, and is the correct answer to the question.

An alkene is a hydrocarbon with one or more carbon-carbon double covalent bonds. Alkenes have the general formula CnH2n assuming non-cyclic structures. They can be represented by the formula RCH=CHR', where R and R' are any atoms or groups of atoms attached to the carbons.

An alkyne is a hydrocarbon with one or more carbon-carbon triple covalent bonds. Alkynes have the general formula CnH2n-2, and can be represented by the formula RC≡CR', where R and R' are any atoms or groups of atoms attached to the carbons.

Based on these definitions, the hydrocarbon that contains one double bond somewhere in the carbon chain is an alkene.

The ion formed by nitrogen is N³⁻, also known as a nitride ion. In an ionic compound with aluminum, Al³⁺ forms the cation, and C⁴⁻ forms the anion called the carbide ion.

The correct symbol for the ion formed by nitrogen is N³⁻. Nitrogen, being in group 15 of the periodic table, is a nonmetal and thus forms negative ions, known as anions. A nitrogen atom will gain three electrons to achieve the electron configuration of neon, the next noble gas, resulting in the formation of a nitride ion with a 3- charge.

Answer: A=2,  B=2 and  C=4

Explanation: Oxygen is the element with atomic number 8 and thus contains 8 electrons which are filled in order of increasing energy levels.

[tex]O:8:1s^22s^22p^4[/tex]

The valence electrons are electrons which are present in the valence shell i.e. the last shell. Thus the valence electrons of Oxygen are in shell 2 in which s orbital contains two electrons and the p orbital contains 4 electrons.

Thus A= 2, B=2 and C=4.

Answer:

The correct number of valance electrons in the electronic configuration of Oxygen is:

A=2, B=2, and C=4

Explanation:

The atomic number of oxygen is 8

The electronic configuration will be,

[tex]\rm O_8\rightarrow1s_2,2s_2,2p_4[/tex]

The electrons present in the outermost shell is called valence electrons.

Hence, in the second shell, the s-orbital contains 2 electrons and the p-orbital contains 4 electrons.

If all the electrons in the outermost shell are removed the first shell becomes a valance shell where 2 electrons are present in the s-orbital.

Therefore correct valence electron configuration is 2,2,4.

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The compounds ranked by boiling point from highest to lowest are: Pentane > Isopentane > Neopentane.

The boiling point of a compound is influenced by its intermolecular forces.

Compounds with stronger intermolecular forces tend to have higher boiling points because more energy is required to overcome those forces and convert the substance from a liquid to a gas.

Generally, the strength of intermolecular forces increases with increasing molecular size and surface area.

Pentane is a linear hydrocarbon with five carbon atoms in a row. It has the highest boiling point among the three compounds because it has the greatest molecular size and surface area.

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