Please help,
How could you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?

Answer:

6molO2 3/2O22Fe=4,5024molFe .

Explanation:

You have to start with the balanced chemical equation. Iron is just Fe. Oxygen in nature is found as an O2 molecule.

2Fe(s)+3/2O2(g) Fe2O3(s)

If you check the balance. There are two Fe on both sides of the equation and three O on both sides, so it’s balanced.

Now use the stoichiometric ratios (the coefficients of the balanced chemical equation) to convert 6 mol of oxygen to iron.

6molO2 3/2O22Fe=4.5024molFe .

These coefficients can be used as conversion factors when it comes to substance moles.

Some of you may insist that a balanced chemical reaction must have whole numbers. This is not really necessary. The reaction I wrote above is a named type of reaction, called Fe2O3 formation. In this type of reaction, there must be a mole of product so that it requires that sometimes there are fractional numbers for the coefficients in the reagents.

But, just for the argument, let’s rebalance the equation for integer coefficients only.

4Fe(s)+3O2(g) 2Fe2O3(s)

We are now using the coefficients as conversion factors, as we have done before.

Molar solubility of AgCl will be  0.59 ×  [tex]10^{-10}[/tex] M.

The amount of a chemical that can dissolve in one liter of a solution before reaching saturation is known as its molar solubility. This implies that the quantity of a substance it can disintegrate in a solution even before the solution becomes saturated with that particular substance is determined by its molar solubility.

A compound's molar solubility would be the measure of how many moles of such a compound must dissolve to produce one liter of saturated solution. The molar solubility unit will be mol L-1.

Calculation of molar solubility:

Given data:

M = 0.30 M

[tex]K_{sp}[/tex] = 1.77 × [tex]10^{-10}[/tex]

The reaction can be written as:

AgCl ⇔ [tex]Ag^{+} + Cl^{-}[/tex]

s            s         (s+0.30)

[tex]K_{sp}[/tex]  = [[tex]Ag^{+}[/tex] ]+ [[tex]Cl^{-}[/tex]]

1.77 × [tex]10^{-10}[/tex] = s (0.30)

s = 1.77 × [tex]10^{-10}[/tex]  / 0.3

s = 0.59 ×  [tex]10^{-10}[/tex] M

Therefore, molar solubility of AgCl will be  0.59 ×  [tex]10^{-10}[/tex] M.

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Answer:

19.6 L SF₆

Explanation:

To find the volume, you need to use the Ideal Gas Law:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation and simplify to find "V".

P = 9.4 atm                               R = 0.08206 atm*L/mol*K

V = ? L                                      T = 128 °C + 273.15 = 401.15 K

n = 5.6 moles

PV = nRT

(9.4 atm)V = (5.6 moles)(0.08206 atm*L/mol*K)(401.15 K)

(9.4 atm)V = 184.3429

V = 19.6 L

Answer:

1)RADICLE ->It is the embryonic root of the plant.

PLUMULE ->It is the embryonic shoot of the plant.

2)RADICLE ->It grows downwards into the soil.

PLUMULE ->It grows upwards into the air.

3)RADICLE ->Radicle is the first part of the seedling.

PLUMULE -> Plumule grows after the radicle.

4)Radicles are negatively phototropic. Plumule is positively phototropic.

i am glad i helped

The approximate molar mass of lauryl alcohol is 183 g/mol.

As per Raoult's law:

[tex]T_b - T_s =KC m[/tex]

Tb = the freezing point of benzene (5.5oC), Ts = the freezing point of the solution, K = the cryoscopic constant (5.12 K*kg/mol for benzene), and Cm = the molality of the solution.

[tex]m_{l}[/tex]/M[tex]m_{s}[/tex] = [tex]C_{m}[/tex] where ml is the mass of lauryl alcohol and ms is the mass of the solvent.

[tex]T_b - T_s =KC m[/tex]=K[tex]m_{l}[/tex]/M[tex]m_{s}[/tex]

Therefore, M=[tex]\frac{Km_{l} }{(T_b - T_s)m_{s} }[/tex]=[tex]5.12*5/0.1(5.5-4.1)[/tex]=183 g/mol.

An organic substance called lauryl alcohol is created industrially from coconut or palm kernel oil. It is an alcoholic fat. The use of sodium lauryl sulfate and other sulfate esters of lauryl alcohol as surfactants is extremely common. In shampoos, sodium laureth sulfate, ammonium laureth sulfate, and sodium lauryl sulfate are all utilized. Lauryl alcohol has a floral scent and is flavorless and colorless. In addition to being a flavor-enhancing food additive, lauryl alcohol is also used to create medicines, lubricating lubricants, surfactants, and monolithic polymers.  Lauryl alcohol is a kind of emollient used in cosmetics.  Lauryl alcohol, a significant scent, and 1-bromododecane, an alkylating agent used to increase the lipophilicity of organic molecules, are both precursors to Lauryl alcohol.

A solution of 5. 00 g of lauryl alcohol in 0. 100 kg of benzene freezes at 4. 1°c. what is the approximate molar mass of lauryl alcohol?

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The molecular mass of MgCO3 is 84.313 grams/mol.

The relative molecular mass of MgCo3

Symbol          Mg                               C                                O

Atoms             1                                  1                                 3

Name         Magnesium                  Carbon                      Oxygen

Atomic            12                                6                                 8

Molar Mass   24.305                      12.011                        15.999  

Total              24.305                      12.011                        47.997=84.313

The molecular mass of MgCO3 is 84.313 grams/mol.

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Answer:

single displacement

Explanation:

the metal replaces the hydrogen of the acid to for a salt and hydrogen gas

According to Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will be doubled.

Boyle's law is one of the gas laws that states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.

Boyle's law equation can be represented as follows:

P = KV

This law suggests that as the pressure of a gas increases, the volume decreases.

Therefore, in accordance with Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will increase times 2 or double.

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The conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.

The most prevalent kind of fatty acid with sixteen carbon atoms without carbon-carbon double bonds would be palmitic acid. There must be a maximum of seven cycles of beta-oxidation in order to totally degrade the fatty acid. 8 acetyl-CoA molecules, 7 NADH molecules, with 7 FADH2 molecules are produced as a result of this.

The primary enzyme, CAT-1, catalyzes the production of acylcarnitine carnitine, which provides the rate-limiting step in beta-oxidation.

Therefore, the conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.

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Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form proteins concentration mechanisms do not include Boiling Stones.

Amino acids organic compounds. Amino acids are building block of life these are the molecules which combine to form proteins. Amino acids contain the amino functional group that is -NH₂ and carboxyl functional group that is -COOH.

Example: Glycine, Alanine etc.

Thus from the above conclusion we can say that Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form proteins concentration mechanisms do not include Boiling Stones.

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Rutherford's scattering experiment demonstrated that the mass of an atom was uniformly distributed throughout its volume this statement is incorrect.

Hence, Option B is correct answer.  

Rutherford's Alpha Scattering Experiment demonstrated that Rutherford bombarded most of the alpha particles passed straight through the gold foil. Rutherford observed that most part of the atom is empty.

The mass of an atom was uniformly distributed throughout its volume this experiment was given by Thomson Model.

Thus from the above conclusion we can say that Rutherford's scattering experiment demonstrated that the mass of an atom was uniformly distributed throughout its volume this statement is incorrect.

Hence, Option B is correct answer.  

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The pH of the solution is 4.96.

pH measures the amount of hydrogen and hydroxide ions in a solution and shows how acidic or alkaline it is.

Weak bases are the solutions to substances that do not dissociate completely in water. Conjugate acids are the product formed by the base and have a difference of one proton.

Using the base dissociation constant, Ka

pKa can be calculated as,

[tex]pKa = - log (Ka)[/tex]

       [tex]= - log (7.1 * 10^-6)[/tex]

       [tex]= 5.15[/tex]

0. 025 M in the weak base and 0. 039 M in the conjugate weak acid.

Therefore, a weak base and its conjugate acid are present in equal proportions in buffer solution. As we are aware, the Henderson-Hasselbalch equation can be used to determine the pH of a buffer solution that comprises a weak base and its conjugate acid.

[tex]pH = pK + log [\frac{A^-}{HA} ]\\[/tex]

     [tex]= 5.15 + log( \frac{0.025}{0.037})[/tex]

     [tex]=5.15 + log 0.64[/tex]

     [tex]=5.15-0.19[/tex]

     [tex]=4.96[/tex]

Therefore, the pH of the solution is 4.96.

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Answer:

A.) 3.3 x 10⁻¹⁸ J

Explanation:

You can calculate the energy using the following equation:

E = hf

In this equation,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> f = frequency (Hz)

Therefore, you can plug the given values into the equation and solve for "E".

E = hf                                                                      <----- Equation

E = (6.626 x 10⁻³⁴ J*s)(5.0 x 10¹⁵ Hz)                    <----- Insert values

E = 3.3 x 10⁻¹⁸ J                                                     <----- Multiply

Answer:

32 ° F

Explanation:

Freezing temp for water is 32 degrees at 1 atm

The temperature at which a liquid's vapor pressure equals the pressure of the gas above it is known as the boiling point of the liquid. The temperature at which a liquid's vapor pressure equals one atmosphere is considered the liquid's typical boiling point (760).

When the vapor pressure of a liquid equals the pressure of the gas above it, the liquid boils. The temperature at which a liquid will boil decreases with decreasing gas pressure above the liquid.

The Macro Perspective.A liquid's vapor pressure rises as it warms until it reaches the same level as the gas above it. Within the bulk liquid, vaporize liquid (i.e., gas) bubbles form, rise to the surface, burst, and release the gas. (A bubble's internal vapor pressure is sufficient to prevent the bubble from collapsing at boiling temperature.)The liquid's molecules must overcome their forces of attraction in order to create vapor.

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The molecular formula of the given compound is H₂CO₃ or Carbonic acid.

Given that,

H= 3.3%

C=19.3%

O= 77.4%

No.of moles of H= 3.3/1= 3.3

No. of moles of C= 19.3/12= 1.60

No.of moles of O= 77.4/16= 4.83

Therefore,the ratio of the atoms of C,H and O= 3.3 : 1.60 : 4.83

Divide by smallest value which you get= 3.3/1.60 : 1.60/1.60 : 4.83/1.60 =2 : 1 : 3

So,the empirical formula is H₂CO₃

Let the Molecular formula is (H₂CO₃)n

Then, molar mass = (2×1+1×12+3X16)n = 62n

As the question, 62n = 60

or, n= 0.96 (round figure is 1)

So, the molecular formula is (H₂CO₃)1= H₂CO₃ i.e., the compound is Carbonic acid.

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Answer:

It displays the static pressure loss over a length of 100 feet for a specific duct size and airflow.

People who work in the HVAC and construction industries use ductulators to size the ductwork in mechanical systems. It enables you to select the volumetric flow rate after selecting the static pressure you wish to keep in the duct. The ductulator offers you a wide range of rectangular duct diameters that will create this when you enter those criteria. It also displays the required diameter for a circular duct. The actual instrument is constructed of sturdy, thick paper, and it contains a rotating piece that lets you select the two settings I previously indicated.

Answer:

Hydrogen bonding is the major intermolecular attraction responsible for the relatively high boiling points of alcohols.

The confocal microscope would you use to visualize a sample labeled with an antibody conjugated to a fluorescent tag.

Confocal microscopy, also known as laser light microscopy microscopy as well as confocal laser scanning microscopy, would be an optical imaging technique that employs a spatial aperture to block out-of-focus light during the image-formation process to increase the optical resolution as well as the contrast of a micrograph.

Confocal microscopy's fundamental tenet is that the lighting and detection lenses are concentrated at the same light scattering point, which would be traversed over the sample to create the entire image on the detector.

Therefore, The confocal microscope would you use to visualize a sample labeled with an antibody conjugated to a fluorescent tag.

Hence, option (a) will be correct answer.

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Answer:

specular reflection reflects all light which arrives from a given direction at the same angles where diffus reflection reflects light in a broad range of direction

The stable form  of the major product of naoch2ch3 in ch3ch2oh reaction is given below.

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Hydrochloric acid  (HCl) and brine both  compound expect to be removed from the organic layer extracted with 1 m NaOH solution.

Using a solvent, a component of interest is selectively removed from a mixture during extraction. The process has been utilized to form the phase separation with the solvent in one phase, and the solute to be present in another phase.

The extraction process can be differentiated based on the phase of the solute and solvent. For example, solid-liquid, liquid-liquid, solid-gas and others.

The extraction with the use of the NaOH forms the solute to lose an electron to the hydroxide of the NaOH and forms the layer of the negative acid. The use of Brine and HCl forms to bond with the organic layer and mediate the extraction process.

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Answer:

Thiols contain stronger acids than alcohols

Explanation:

Answer:

Sulfur is a bigger atom than oxygen and has a lower electgronegativity value. Therefore, the lone pair availability in thiol is higher than alcohol

Explanation:

Answer: electrostatic attraction

Explanation: ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.

The volume of the 18M HCl needed to make the solution will be 2.5 mL.

According to the dilution principle, the number of moles of solutes in a solution before and after dilution must remain the same.

Since, mole = molarity x volume

Thus, molarity x volume before dilution = molarity x volume after dilution.

Mathematically, the equation is written as: m1v1 = m2v2

In this case, m1 = 18 M, m2 = 1.5 M, and v2 = 30 mL.

What we are looking for is v1, the amount of the stock HCl needed for dilution.

v1 = m2v2/m1 = 1.5 x 30/18 = 2.5 mL.

Thus, 2.5 mL of the stock HCl would be needed.

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The end (final) value of n in a hydrogen atom transition is 2.

Using the Rydberg formula ;

1/lamda = R ( 1/[tex]n_{f} ^{2}[/tex] - 1/[tex]n_{i} ^{2}[/tex] )

where , lamda = wavelength = 486 nm = 486 ×[tex]10^{-9} m[/tex]

[tex]n_{f}[/tex] in a hydrogen atom transition = final state = ?

[tex]n_{i}[/tex] in a hydrogen atom transition = initial state = 4

R = Rydberg constant = 1.097 ×[tex]10^{7} m^{-1}[/tex]

1/ 486 ×[tex]10^{-9} m[/tex] = 1.097 ×[tex]10^{7} m^{-1}[/tex] (  1/[tex]n_{f} ^{2}[/tex] - 1/[tex]4^{2}[/tex] )

[tex]n_{f}[/tex] = 2

Missing parts :

Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in n=4 and the atom emits a photon of light with a wavelength of 486 nm.

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Answer:

18.0 g H₂O

Explanation:

To find the mass of water (H₂O), you need to (1) convert grams O₂ to moles O₂ (via the molar mass), then (2) convert moles O₂ to moles H₂O (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂O to grams H₂O (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Molar Mass (O₂): 2(15.998 g/mol)

Molar Mass (O₂): 31.996 g/mol

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

2 H₂ + 1 O₂ -----> 2 H₂O

16.0 g O₂          1 mole            2 moles H₂O         18.014 g
---------------  x  ----------------  x  ---------------------  x  -----------------  = 18.0 g H₂O
                        31.996 g             1 mole O₂             1 mole

Answer:

During the process of heat transfer, the heat transferred to or from a system's surroundings is always equal in magnitude to the heat transferred to or from the system, but opposite in sign.

The total energy of an isolated system is said to stay constant according to the first rule of thermodynamics. Energy cannot be generated or destroyed, but it may be transformed from one form into another inside a closed system, which is known as the conservation of energy.

This rule states that when a system is exposed to a certain amount of heat, the amount of heat that the system absorbs is equal to the product of the increase in internal energy (change in internal energy) of the system and the external work that the system does. The relationship between a system's internal energy and work output and the heat given to it is demonstrated by the first law of thermodynamics. This equation provides the foundation for the majority of practical innovations like heat engines, freezers, and air conditioners.

The equation for the first law of thermodynamics is given as; ΔU = q + W

Where,

The heat transported to or from a system's surroundings during the process of heat transfer is always opposite in sign, but equal in size, to the heat transferred to or from the system.

What is heat transfer?

       The flow of thermal energy between physical systems is known as heat transfer. The temperatures of the systems and the characteristics of the medium used to transmit the heat affect how quickly it transfers. Conduction, convection, and radiation are the three basic ways that heat is transferred. It is crucial to employ heat transfer, or the movement of energy in the form of heat, in applications of the First Law of Thermodynamics since it is a mechanism through which a system changes its internal energy. Diffusion and conduction are two different concepts. Diffusion linked to fluid mixing is not the same as conduction.

    The Second Law of Thermodynamics controls the direction of heat transmission, which is from one area of high temperature to another area of lower temperature. The internal energy of the systems from and to which the energy is transmitted is altered during heat transfer. Heat transfer will take place in a way that makes the group of systems' entropy higher.

   In physics, heat is described as the flow of thermal energy over a boundary that is clearly defined surrounding a thermodynamic system. The amount of work that a thermodynamic system may accomplish is known as the thermodynamic free energy. Enthalpy is a thermodynamic potential with the letter "H" that is made up of the system's internal energy (U) plus the volumetric product of pressure (P) and temperature (T) (V). A joule is a unit used to measure energy, effort, or heat production.

  The quantity of heat transmitted in a thermodynamic process that modifies a system's state relies on how that process happens, not just the net difference between the process' beginning and ending states, since heat transfer is a process function (or route function), as opposed to a function of state.

 The heat transfer coefficient, which represents the relationship between the heat flux and the thermodynamic force that drives the flow of heat, is used to determine both thermodynamic and mechanical heat transfer. A quantitative, vectorial description of the movement of heat through a surface is called a heat flux.

     The term "heat" is sometimes used interchangeably with "thermal energy" in technical applications. This usage derives from the historical understanding of heat as a fluid (caloric) that may be transported by a variety of reasons, which is also prevalent in laypeople's language and daily life.

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The tetrahedral structure that forms the backbone of all silicate minerals is composed of silicon and option(b) i.e, oxygen

The tetrahedron-shaped silica chemical structure. It comprises a core silicon atom that connects with four oxygen atoms on both sides. The tetrahedron-shaped geometric figure that is drawn around this configuration has four sides, each of which is an equilateral triangle.

Silicon and oxygen make up the silica tetrahedron, which serves as the base for all silicate crystals. In all sorts of rocks and everywhere in the world, the mineral quartz, SiO2, is formed. In deposited rocks, it manifests as sand grains, in igneous and metamorphic rocks, as crystals, and in veins that cut through all different types of rocks. These veins occasionally contain gold or other precious metals. It is widely known that up until the late 1700s, it was simply known as rock crystal. Quarts belong to a class of minerals known as silicates, all of which include silicon and oxygen in varying amounts. The majority of the minerals in the crust of the planet are silicates, and most estimates place 97 percent of the mantle and 95 percent of the crust in the crust.

The complete question is:  

The silica tetrahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?

a. magnesium c. iron

b. oxygen d. carbon

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