How do I balance Ag(s) + H2S(g) + 02(g) arrow Ag2(S(s) + H2O(l)

Answer:

a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium

b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum

c) Cesium > Potassium

Explanation:

We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.

Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.

Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.

The equilibrium constant (Kc) for the given reaction is approximately 16.448. The value of Kc indicates the relative concentrations of reactants and products at equilibrium. In this case, a Kc greater than 1 suggests that the products (H2 and P4) are favored at equilibrium, indicating that the forward reaction is more favorable.

To determine the equilibrium constant (Kc) for the given reaction:

4PH3(g) ↔ 6H2(g) + P4(g)

We can write the equilibrium constant expression based on the stoichiometric coefficients:

Kc = ([H2]^6 * [P4]) / ([PH3]^4)

Substituting the given equilibrium concentrations:

[PH3] = 0.250 M

[H2] = 0.580 M

[P4] = 0.750 M

We can plug in these values into the equilibrium constant expression:

Kc = ([0.580]^6 * [0.750]) / ([0.250]^4)

Kc = (0.0860128 * 0.750) / (0.00390625)

Kc = 16.448

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Answer:

C

Explanation:

because its half life is shorter than the subsequent ones

Nadia will take 8 seconds to reach her friend's house.

Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).

To calculate the time Nadia will take to reach her friend's house, we can use the formula;

time = distance / speed

where distance is the amount of space traveled by an object, and time is the duration of travel.

Put the values given in the problem, we have:

time = 24 meters / 3 m/s

time = 8 seconds

Therefore, Nadia will take 8 seconds.

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Digital waves are commonly used in high-frequency wireless networks instead of analog waves because digital signals are less susceptible to interference from obstacles and noise.

Analog signals vary continuously over time and can be affected by various forms of interference, such as distortion or attenuation, which can result in the loss or corruption of information.

In contrast, digital signals are represented as a series of discrete values or binary digits, which are more resilient to interference and can be easily reconstructed at the receiving end. Digital signals are also easier to compress, allowing for more efficient use of the available bandwidth and higher data transfer rates.

Therefore, digital signals are the preferred choice for high-frequency wireless networks as they provide reliable, high-speed data transmission while minimizing the impact of interference and signal loss caused by obstacles.

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Answer:

5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.

Explanation:

Using the ideal gas law, PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin, we can solve for V.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15 K. Therefore, the temperature is 25.0 + 273.15 = 298.15 K.

Next, we can plug in the values we know:

PV = nRT

(153 kPa) V = (5.00 mol) (8.31 J/mol*K) (298.15 K)

Simplifying:

V = (5.00 mol) (8.31 J/mol*K) (298.15 K) / (153 kPa)

V = 103.6 L

Therefore, 5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.

Explanation:

The molar volume corresponds to the volume occupied by any gas at STP, which is equal to 22.4 L.

So:

22.4 L ---- 1 mol

3.56 L ---- x mol

x = 0.159 moles

To find the molar mass we use the following formula:

molar mass = mass/moles

molar mass = 11.3/0.159

molar mass = 71.1

Answer: 71.1 g/mole

The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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Answer:

Radiation

Explanation:

Sun rays shine on earth. Thats radiation.

Answer:

Cu2 + 2Mg-> 2Cu+ Mg2

Explanation:

Balance the equation and make sure both the reactant and the products are the same

Hope it will be helpful

\(Cu^{+2} + 2Mg\)  -> \(2Cu + Mg^+2\)  is the correct half-reactions.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total oxidation numbers is the same for both the reactants and the products.

\(Cu^{+2} + 2Mg\)  -> \(2Cu + Mg^+2\) is the correct half-reactions.

Magnesium is oxidized because its oxidation state increased from 0 to +2 while Cu is reduced because its oxidation state decreased from +2 to 0.

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Answer:

It has a constant average kinetic energy.

Explanation:

According to the kinetic molecular theory, the particles of a gas are in constant random motion and possess kinetic energy. This kinetic energy is directly proportional to the temperature of the gas.

If the sample of gas is at a constant temperature and volume, it means that the average kinetic energy of its particles is constant.

C, it has a constant average kinetic energy is the correct statement.

Explanation: The kinetic molecular theory of gases states that a gas contains an enormous number of atoms/molecules.

The kinetic-molecular theory of gases can be stated as such: A gas consists of molecules in constant random motion. Gas molecules influence each other only by collision; they exert no other forces on each other. All collisions between gas molecules are perfectly elastic; all kinetic energy is conserved.

Happy to help, have a great day! :)

Answer:

Round to the number of significant figures in the original question. However, if you're going to proceed with further calculations using this mass, it's best not to round, as rounding will cause your answer to be less precise.

Explanation:

Answer:

THE ENTHALPY OF REACTION IN KJ/MOL OF CH4 IS 7.07 KJ/MOL.

Explanation:

Mass of H2 = 3 g

Molar mass of H2 = 2 g/mol

Heat released = 53.3 kJ

Equation of the reaction:

C(s) + 2H2(g) -------> CH4(g)

First:

Calculate the number of moles of H2 that was used:

Number of moles = mass / molar mass

Number of moles = 3g / 2g

Number of moles = 1.5 moles

So therefore, when 53.3 kJ of heat was released from the reaction, 1.5 moles of hydrogen was used.

From the equation of the reaction, one mole of carbon reacts with two moles of hydrogen to form one mole of methane.

For 3 g of hydrogen, 1.5 mole of hydrogen is involved.

It means:

1.5 moles of hydrogen reacts with 0.75 moles of carbon and produces 0.75 moles of methane. This is so because the reaction occurs in 1: 2: 1 in respect to carbon, hydrogen and methane respectively.

So we can say that the production of 0.75 mole of methane will evolve 53.3 kJ of heat.

0.75 mole of methane releases 53.3 kJ of heat.

1 mole of methane will release ( 53.3 kJ * 1 / 0.75 )

= 71.0666 kJ of heat

In conclusion, the enthalpy of the reaction in kJ/ mole of CH4 is 71.07 kJ/mol.

Answer:  Atoms of different elements are found to have different number    of protons, neutrons, and electrons. To distinguish one atom from another or to classify the various atoms, a number which indicates the number of protons in the nucleus of a given atom, is assigned to the atoms of each identified element. This number is known as the atomic number of the element. The atomic numbers for some of the elements which are associated with the study of semiconductors are given in the following table.

Explanation:

Element Symbol Atomic Number

Silicon Si 14

Germanium Ge 32

Arsenic As 33

Antimony Sb 51

Indium In 49

Gallium Ga 31

Boron B 5

Answer:

\(\boxed {\boxed {\sf Protons \ and \ neutrons}}\)

Explanation:

The atom is made up of two main parts: the nucleus and the electron cloud.

The nucleus is the center and has two subatomic particles: the protons (positive charge) and the neutrons (no/neutral charge). The nucleus as a whole has a positive charge, since the neutrons don't provide a charge.

The electron cloud surrounds the nucleus and houses the negatively charged electrons in a "cloud" of energy levels.

So, the nucleus of the atom is made up of protons and neutrons.

Answer:

heat energy

Explanation:

Conduction is the transfer of heat energy from one substance to another or within a substance.

The atomic radius is the distance between the nucleus of an atom and the outside border of the electron cloud. Atomic radius falls during a period and grows down a group in general. As electron shielding remains constant over time, effective nuclear charge grows.

Atomic radius reduces with time because valence electrons are added to the same energy level while the nucleus increases in protons. The increased nuclear charge attracts electrons more strongly, causing them to move closer to the nucleus.

The electron enters the same shell as the atomic number grows throughout a period.

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Answer:

Electronegativity

Explanation:

The ability of an atom to attract itself an electron pair shared with another atom in a chemical bond.

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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HSO3^- is the conjugate base of H2SO3 (sulfurous acid). When it dissolves in water, it behaves as an acid. In other words, it donates a proton (H+) to a water molecule, producing hydronium ions (H3O+) and sulfite ions (SO32-). Therefore, the products that form when HSO3^- behaves as an acid in water are H3O+ (hydronium ion) and SO32- (sulfite ion).

The chemical reaction can be represented as follows:HSO3^- + H2O → H3O+ + SO32-This is an example of an acid-base reaction, in which HSO3^- is the acid and water is the base. The HSO3^- donates a proton to the water molecule, which acts as a base by accepting the proton to form H3O+.

This reaction is reversible, meaning that H3O+ can also act as an acid by donating a proton to the SO32- ion to reform HSO3^-.The sulfite ion (SO32-) is a weak base and can also react with water to form the hydroxide ion (OH-). This reaction can be represented as follows:SO32- + H2O → HSO3^- + OH-

Overall, when HSO3^- behaves as an acid in water, the products that form are H3O+ and SO32-. This reaction is an example of an acid-base reaction, in which the HSO3^- acts as an acid by donating a proton to water, which acts as a base.

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Answer:

Sodium Carbonate was the unknown powder

Answer:

a drawer of many socks

plain water

cereal in milk

The arrow is pointing to the symbol of the element. Option D

We know that we arrange the elements that we have in the periodic table of the elements and that the properties of the elements could be revealed by the intricacy of the arrangement of the elements.

The entry of the elements in the periodic table does have three components and these are;

The symbol of the element

The mass number

The atomic  number.

The arrow is showing what the chemical symbol of the manganese is.

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Answer:

C. Gases

Explanation:

A gas is matter that has no definite shape or volume. The particles are far apart and move freely. In a gas, particles move much faster and the attractive forces are weaker than the attractive forces in a liquid and a solid.

The final concentration of I ions in the resulting solution is approximately 0.0311 M, expressed with three significant figures.

To determine the final concentration of I ions in the resulting solution, we need to consider the stoichiometry and volumes of the solutions being mixed.Given:

Volume of NH4l solution = 129.13 mL

Concentration of NH4l solution = 112.9 mM = 0.1129 M (converting from millimolar to molar)

Volume of Mgl2 solution = 105.31 mL

Concentration of Mgl2 solution = 0.87 M

First, we need to determine the moles of NH4l and Mgl2 in their respective solutions:

Moles of NH4l = Volume of NH4l solution * Concentration of NH4l solution

Moles of NH4l = 0.12913 L * 0.1129 M = 0.01459 moles NH4l

Moles of Mgl2 = Volume of Mgl2 solution * Concentration of Mgl2 solution

Moles of Mgl2 = 0.10531 L * 0.87 M = 0.09157 moles Mgl2

Next, we determine the limiting reagent, which is the reactant that is completely consumed and determines the maximum amount of product formed. In this case, the limiting reagent is NH4l because it has fewer moles than Mgl2.

The balanced chemical equation for the reaction between NH4l and Mgl2 is:

2 NH4l + Mgl2 → 2 NH4+ + MgI2

From the balanced equation, we can see that for every 2 moles of NH4l, we get 1 mole of MgI2.

Since the moles of NH4l is the limiting reagent, it will be completely consumed, and the moles of MgI2 formed will be half of the moles of NH4l.

Moles of MgI2 = 0.01459 moles NH4l * (1 mole MgI2 / 2 moles NH4l) = 0.007295 moles MgI2

Finally, we calculate the final concentration of I ions in the resulting solution:

Volume of resulting solution = Volume of NH4l solution + Volume of Mgl2 solution

Volume of resulting solution = 0.12913 L + 0.10531 L = 0.23444 L

Final concentration of I ions = Moles of MgI2 / Volume of resulting solution

Final concentration of I ions = 0.007295 moles / 0.23444 L = 0.0311 M

Therefore, the final concentration of I ions in the resulting solution is approximately 0.0311 M, expressed with three significant figures.

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Answer:

Explanation:

Which of the following is most likely to be ductile?

a. Metal
b. Nonmetal
c. Metalloid
d. Gas

Answer: a. MetalMetal

The mass of 1 atom of copper metal in the given face-centered cubic structure is determined as  1.054 x 10⁻²² g.

The mass of 1 atom of copper is calculated as follows;

mass of 1 atom of copper = molar mass of copper / Avogadro's number

substitute the value of molar mass of copper and Avogadro's number;

mass of 1 atom of copper = (63.5 g/mol) / (6.023 x 10²³)

mass of 1 atom of copper = 1.054 x 10⁻²² g

Thus, the mass of 1 atom of copper is determined as  1.054 x 10⁻²² g.

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Answer:

I'd say 624.2^3 inches.

Explanation: