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Directions: Name the covalent compound created.
EXAMPLE- Sr3P2= Tristrontium diphosphide

CH4 =
B2Si =
N2O5 =
CO2 =

To determine if the internal energy of a system increases or decreases, we usually analyze changes in its temperature, volume, or pressure. If the temperature rises, it signifies an increase in internal energy, and vice versa.

The diagram in question represents a decrease in the internal energy of the system. This is because the final state of the system is at a lower energy level than the initial state. In terms of the absence of work associated with the process, it is important to note that the change in internal energy of a system is determined by the heat added to or removed from the system. If there is no work involved in the process, then the heat transferred must be the only factor contributing to the change in internal energy. Therefore, if heat is added to the system, it is endothermic as the internal energy of the system increases, whereas if heat is removed from the system, it is exothermic as the internal energy of the system decreases.

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The time required to plate out 2.19 g of chromium metal is approximately 309 minutes. The correct answer is option b) 5.14 minutes.

To determine the time required to plate out 2.19 g of chromium metal, we can use Faraday's law of electrolysis, which states that the amount of substance deposited or produced is directly proportional to the quantity of electricity passed through the cell.

The formula is:

m = (Q × M) / (n × F)

where:

m is the mass of the substance (in grams),

Q is the quantity of electricity (in coulombs),

M is the molar mass of the substance (in grams/mole),

n is the number of electrons transferred in the reaction, and

F is the Faraday constant (approximated as 96,485 coulombs/mole).

Given:

m = 2.19 g

I = 39.5 A (current)

t = ? (time in seconds)

First, let's find the quantity of electricity passed (Q):

Q = I × t

Next, we need to calculate the number of moles of chromium (n):

n = m / M

The molar mass of chromium (Cr) is approximately 52 g/mol.

Using Faraday's law, we can rearrange the formula to solve for time (t):

t = (n × F) / I

Now we can substitute the given values and calculate the time in seconds:

t = ((2.19 g / 52 g/mol) × 96,485 C/mol) / 39.5 A

t ≈ 5.14 seconds

Finally, since we are looking for the time in minutes, we divide the result by 60:

t ≈ 5.14 seconds / 60 ≈ 0.086 minutes

Therefore, it will take approximately 0.086 minutes (or 5.14 seconds) to plate out 2.19 g of chromium metal from the solution. The answer is option b) 5.14.

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Radiation used in the processing of food is intended to increase the rate of nutrient decomposition. Therefore, option 1 is correct.

As a mutagen, radiation has the potential to eventually cause cancer. Radiation has the power to kill cells or harm the DNA within them, which impairs the cells' capacity for reproduction and may ultimately result in cancer. High energy particles flow through your body when radiation is present.

Food can be effectively preserved using irradiation, which increases its shelf life and lowers the likelihood of food spoilage. The method benefits the consumer as well by lowering the danger of illnesses brought on by foodborne infections.

Thus, option 1 is correct.

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Answer:6 atoms

Explanation:Each NaOH has one Na and one O and one H. Therefore, 2 NaOH has 6 atoms.

Answer:

Three atoms

Explanation:

Hope this helps

The purpose of the fourth pot that contained no fertilizer is to observe the actual growth of the plant without any fertilizers.

Fertilizers paintings by means of imparting vital vitamins to developing plants, bushes, and veg, as a form of multi-nutrition or meal substitute for the plant international. Many fertilizers additionally improve the way the soil works by helping it to maintain water higher and allowing air to drift freely, which is right for roots.

Fertilizers increase their growth via the application of fertilizer remedies. development in plant boom was notably discovered by means of the application of each natural and inorganic source of mineral vitamins.

The more fertilizer a crop gets, the faster it grows. We understand if a crop is supplied with too little fertilizer, plant increase response is negative; however if fertilizer charges are immoderate, plant increase slows and there is a potential for root harm or demise from high fertilizer salts.

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The bond angle between two adjacent hybrid orbitals is 120°, the hybridization is d. sp2.

The new set of hybrid orbitals creates trigonal structures, growing a molecular geometry of a hundred and twenty degreesThe accurate solution is a hundred and twenty degree. The sp2 s p 2 hybridization corresponds to a trigonal planar geometry and the bond attitude for this geometry is a hundred and twenty degree.

The geometry of the sp2 hybrid orbitals is trigonal planar, with the lobes of the orbitals pointing in the direction of the corners of a triangle. The attitude among any of the hybrid orbital lobes is a hundred and twenty°.aggregate of s and p orbital fashioned in trigonal symmetry and is maintained at 1200.

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the flow of water

Explanation:

it's actually b)

Answer:

The reddish-brown substance is a different color than the fertilizer, which is white, and the substance that makes up the pipe, which is gray. This means that they cannot be the same substance because they do not have the same properties. The atomic models show that the reddish-brown substance is made up of different repeating groups of atoms than the fertilizer and the pipe substance. The difference in atoms caused the difference in properties.

Explanation:

lul

People of westfield identifying the reddish brown substance and that substance is rust i.e. iron oxide.

Rust is a chemical compound which is formed by the oxidation reaction between iron and oxygen for the formation of iron oxide.

People of westfield observed the reddish brown color in the water, that is the rust compound which is obtained by the chemical reaction occur between the iron pipes and the compound present in the fertilizers that are present in water.

Hence, the reddish brown substance in rust.

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The correct answer is E) SO₄²⁻. The conjugate base of HSO₄⁻ is E) SO₄²⁻. To determine the conjugate base of HSO₄⁻ , we need to understand that a conjugate base is formed when an acid donates a proton (H⁺). In this case, the acid is  HSO₄⁻ . When HSO₄⁻ donates a proton, it loses one H⁺ and becomes SO₄²⁻. Thus, the conjugate base of HSO₄⁻ is SO₄²⁻.

A conjugate base is the species that remains after a proton (H⁺) is removed from an acid. In the case of HSO₄⁻ , it is a weak acid that can donate one proton to a base. Once it loses a proton, it becomes its conjugate base, which is SO₄²⁻. This is because the hydrogen ion that was removed from HSO₄⁻ leaves behind the sulfate ion (SO₄²⁻) with a negative charge.

It is essential to understand the concept of conjugate acid-base pairs as they are fundamental to acid-base chemistry. The conjugate acid-base pair has the same chemical formula but differs in the presence or absence of an extra proton. Understanding these concepts will help you solve problems related to acid-base equilibria, pH calculations, and buffer systems.

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The approximate mass percent of hydrogen in propyne 10%.

One carbon atom has mass of 12 amu (unified atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (proton or neutron).

m(C) = 12 amu; mass of the carbon atom

m(H) = 1 amu; mass of the hydrogen atom

m(C₃H₄) = 3 × m(C) + 4 × m(H)

m(C₃H₄) = 3 × 12 amu + 4 × 1 amu

m(C₃H₄) = 40 amu; mass of the propyne molecule

ω(H) = 4 × m(H) ÷ m(C₃H₄) × 100%

ω(H) = 4 × 1 amu ÷ 40 amu × 100%

ω(H) = 10%; the approximate mass percent of hydrogen in propyne

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A solution with a molarity of 0.024 M contains 0.060 moles of nahco3 in 2500 ml. When describing how concentrated a solution is, molarity is an essential measurement.

The solution's volume has a big impact on the concentration, a solution based on molarity. In this post, we learned about molarity and molality, along with their units and computation procedures. When the solute and solvent interact, any solution can form in a homogenous mixture. A solute is a substance that is present in a solution in less of it than the solvent, and it dissolves in the solvent, which is present in a greater quantity.

Molarity is the quantity of solute in moles per litre of solution.

2.5 L and 0.060 mol of NaHCO3 are equal to 0.024 M.

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The concentration of a solution that is prepared by dissolving 15 mg of NaCl in 200 mL water is 75 ppm. So, the correct option is a.

To calculate the concentration in parts per million (ppm), we need to determine the amount of NaCl dissolved in the solution and then convert it to ppm.

Mass of NaCl = 15 mg

Volume of solution = 200 mL

First, we need to convert the volume from milliliters (mL) to liters (L):

Volume of solution = 200 mL = 200/1000 L = 0.2 L

Next, we can calculate the concentration of NaCl in mg/L:

Concentration (mg/L) = (mass of solute in mg) / (volume of solution in L)

Concentration (mg/L) = 15 mg / 0.2 L = 75 mg/L

Finally, we can convert the concentration from mg/L to ppm:

Concentration (ppm) = Concentration (mg/L) = 75 ppm

Therefore, the concentration of the NaCl solution is 75 ppm, which corresponds to option (a).

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The difference in intermolecular forces between dimethyl ether and ethanol is responsible for their different physical properties.

Dimethyl ether is a gas at room temperature because it has weak van der Waals forces between its molecules, which allows the molecules to move freely and escape from the liquid phase. Ethanol, on the other hand, has stronger intermolecular forces such as hydrogen bonding, which makes it a liquid at room temperature with a higher boiling point.

The hydrogen bonding between ethanol molecules causes them to stick together more tightly than the van der Waals forces between dimethyl ether molecules, which results in a higher boiling point.

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Answer:

if you search up the periodic table and go to any website it will let you press on the element and it will say if it is a gas,solid or liquid and it might say if it is man made!

Explanation:

i really hope this helps:)

Ag+ ions are often chosen as a tracer because they are relatively easy to detect and analyze.

In a diffusion in a solid experiment, the purpose of introducing Ag+ (silver ions) is to serve as a tracer or marker to track the diffusion process within the solid material. diffusion refers to the movement of particles or molecules from an area of higher concentration to an area of lower concentration. In solid materials, diffusion typically occurs at a much slower rate compared to liquids or gases. By introducing Ag+ ions into the solid material, researchers can monitor the movement and spread of these ions over time, which provides insights into the diffusion behavior of other species or elements within the solid.Researchers can use various analytical techniques such as spectroscopy or microscopy to measure the concentration and distribution of Ag+ ions at different points within the solid material. By studying the diffusion of Ag+ ions, researchers can gain valuable information about the diffusion mechanisms, pathways, and rates within the solid, which can have implications in materials science, engineering, and other fields of study.

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The order from shortest to longest covalent bond length is: CO < NH3 < CH4 < PH3 < SiH4.

The following five covalent bonds found in camp (carbon monoxide, ammonia, methane, phosphine, and silane) can be ordered from shortest to longest based on the van der Waals radii of the bonded atoms.

Carbon Monoxide (CO): The bond length between carbon and oxygen is the shortest among the five bonds.

Ammonia (NH3): The bond length between nitrogen and hydrogen in ammonia is slightly longer than the bond length in CO.

Methane (CH4): The bond length between carbon and hydrogen in methane is longer than the bond length in NH3.

Phosphine (PH3): The bond length between phosphorus and hydrogen in phosphine is longer than the bond length in CH4.

Silane (SiH4): The bond length between silicon and hydrogen in silane is the longest among the five bonds.

So, the order from shortest to longest covalent bond length is: CO < NH3 < CH4 < PH3 < SiH4.

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Answer:

The reaction given in the problem introduction is:

C2H4 + H2O → C2H5OH

To determine which equation needs to be reversed to obtain this overall reaction, let's compare the reactants and products in each equation.

1. C2H4 + H2 → C2H6 (Ethylene + Hydrogen gas → Ethane)

2. H2 + 1/2O2 → H2O (Hydrogen gas + Oxygen gas → Water)

We can see that the second equation involves the formation of water (H2O), which matches one of the products in the overall reaction. However, the equation needs to be reversed in order to align the reactants correctly.

Therefore, the second equation needs to be reversed:

H2O → H2 + 1/2O2

When we reverse the second equation and combine it with the first equation, we get the overall reaction:

C2H4 + H2O → C2H5OH

So, the correct equation to reverse is the second equation.

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The amount of heat required to purify the Al is 25.94 * 10^3 J

The term heat capacity refers to the amount of heat required to raise the temperature of a substance by 1K. The aluminum was heated from 298 K to 933 K then it melted.

The total heat required is;

H = ncdT + nL

H = (1 * 24 * (933 - 298)) + (1 * 10.7 * 10^3)

H = 15.24 * 10^3  J + 10.7 * 10^3 J

H = 25.94 * 10^3 J

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#a

Molar mass of CO2=44g/mol

given mass=4.4g

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:Mass}{Molar\;Mass}=\dfrac{4.4}{44}=0.1mol\)

#b

0.1mol weigh:-

\(\\ \sf\longmapsto 22.4(0.1)=2.24L\)

#c

No of molecules=Moles×Avagradro No

\(\\ \sf\longmapsto 0.1\times 6.023\times 10^{22}=6.023\times 10^{21}molecules\)

#d

No of molecules=

\(\\ \sf\longmapsto 3\times 6.023\times 10^{21}=18.069\times 10^{21}molecules\)

#e

\(\\ \sf\longmapsto No\:of\:molecules=6.023\times 10^{21}molecules\)

#f

Lets write balanced equation

\(\\ \sf\longmapsto C+O_2=CO_2\)

#g

It has 2oxygen atoms

\(\\ \sf\longmapsto No\:of\:molecules=2(6.023\times 10^{21})=12.046\times 10^{21}\)

The answer is Option B, The atoms form a bond with a bond length of 75 pm.

In terms of specific characteristics, typically the locations of the atoms, a potential energy surface (PES) represents the potential energy of a system, particularly a group of atoms. If there is only one coordinate, the surface is known as a potential energy curve or energy profile. The surface may specify the energy as a function of one or more coordinates. It is beneficial to think of a system as having two degrees of freedom, such as two bond lengths, because the value of the energy (analogy: the height of the land) depends on two bond lengths (analogy: the coordinates of the position on the ground).

The Potential Energy Surface illustrates the idea that each atom's and molecule's internal and exterior geometries in a chemical reaction have a distinct potential energy. A smooth energy "landscape" is produced, and chemistry can be examined from a topology perspective as a result (of particles evolving over "valleys""and passes").

Internuclear distance: The bond length is determined by the internuclear distance at which the potential energy minimum occurs. Since the two atoms vibrate approximately this distance due to thermal motion, this is more appropriately known as the equilibrium bond length. In general, the bond length will be shorter the stronger the relationship.

It is occasionally possible to utilize an analytically calculated expression for the energy as a function of the atomic locations for very simple chemical systems or when simplifying approximations are made concerning inter-atomic interactions. Among them is

H + H2 → H2 + H

All atoms are subject to attractive forces, but unless the minimum potential energy is at least of the order of RT, the two atoms cannot endure the disruptive effects of thermal energy for long enough to form a recognizable molecule.

Thus, we can conclude that the two atoms in H2 are connected by a chemical bond. Ar2 cannot exist as a molecule due to the weak attraction between argon atoms, but the van der Walls force is what keeps argon atoms together in liquid and solid states.

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The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g

A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.

Given data :

Heat energy liberated = 12,800 kJ

Δ Combustion = 891 kJ/mol

To calculate the mass of methane (CH₄) -

Number of moles of methane burned = Heat energy used

                                                                 Δ Combustion

Number of moles of methane burned = 12880

                                                                    891

Number of moles of methane burned = 14.455 mol

Since, Molar mass of methane is 16.043 g/mol

So, Mass of methane = Number of moles of x Molar mass of methane

                                          methane burned  

Mass of methane = 14.455 mol x 16.043 g/mol

Mass of methane = 231.9 g

Therefore, the mass of methane which must be burned is 231.9 g.

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The enthalpy change (ΔH) for the physical change of Br2 from the gas phase to the gas phase (Br2(g) → Br2(g)) is zero. The entropy change (ΔS) for this physical change is also zero.

In a physical change, the chemical substance remains the same, and there is no breaking or forming of chemical bonds. In the case of Br2 going from the gas phase to the gas phase, there is no change in the chemical identity or composition of the substance.

The enthalpy change (ΔH) measures the heat energy transfer during a reaction or process. Since there is no change in the chemical bonds or composition of Br2 in this physical change, there is no transfer of heat energy, and thus ΔH is zero.

The entropy change (ΔS) quantifies the degree of disorder or randomness in a system. In this physical change, the arrangement and distribution of Br2 molecules remain unchanged, leading to no change in entropy. Therefore, ΔS is also zero.

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Answer:

Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied.

Explanation:

Answer:

because the water brings a cool breeze when the wind blows

Explanation:

Answer:

B

Explanation:

Colligative properties are properties that depend on the amount of substance present.

Freezing point is a colligative property hence it depends on the number of moles of the glucose present in solution. The bigger the concentration of the glucose molecules, the greater the freezing point depression. So, the largest freezing point depression is observed for the solution having the highest concentration of glucose.

Answer:

The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes. Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow.

Explanation:

Explanation:

It is understood that water cycle is also a continuous cycle because it is the continuous movement of water from the earth’s surface to the atmosphere and then back to the ground. It is a continuous process. Hence, it does not have a starting or an ending point.

Answer:

carbon 12 6 6

Explanation: