15. Explain the advantage of using spectral analysis in the identification of an elemental

species over that of using FLAME TESTS?

Answer:

6

Explanation:

Norepinephrine has one benzene cycle , so it has 6 carbon atoms in aromatic group.

Answer:

KI + Pb(NO3)2 -> PbI2 + KNO3

Explanation:

The balanced chemical equation for the reaction of potassium iodide with lead(II) nitrate to form lead(II) iodide and potassium nitrate is:

KI + Pb(NO3)2 -> PbI2 + KNO3

In this equation, the coefficients in front of the compounds indicate the number of moles of each substance that are needed to balance the equation. This means that there are equal numbers of atoms of each element on both sides of the equation.

Answer:

True

Explanation:

Mixtures are substances with indefinite composition. They consist of two or more elements  and or compounds in any proportion by mass.

From these properties we can clearly identify that to separate mixtures, we use the differences in the chemical properties of the constituents of the mixtures.

Answer:

so if an atom needs and electron it will form a bond with another so it will balance out.

Explanation:

Answer:

Gas D

Explanation:

liters at 30 °C

Answer:

Temperature is directly proportional to the kinetic energy of the atoms that a body is made of. This relation is valid concerning the velocities relative to the center of mass of the body. In other words, concerted movements like translation and rotation do not affect temperature.

Explanation:

Answer:

As stated in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.

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Answer: The process by which the particles can reconvene entirely in one of the flasks is: NONSPONTANEOUS.

Explanation:

The spontaneity of a process can affect the distribution of energy and matter within the system. Different chemical or physical processes have the natural tendency to occur in one direction under a given set of conditions. For example:

--> when water is pour down a hill it naturally flows down but it requires outside energy maybe from a water pump to flow up the hill and ,

--> during an iron rust, iron that is exposed to atmosphere will corrode, but rust is not converted to iron without intentional chemical treatment.

Therefore, a spontaneous process is one that occurs naturally under certain conditions. While a NONSPONTANEOUS process, on the other hand, will not take place unless it is initiated by the continual input of energy from an outside source. A process that is spontaneous in one direction under a particular set of conditions is nonspontaneous in the REVERSE direction.

From the two flasks that where connected through a valve, once the valve was opened, the gas spontaneously becomes evenly distributed between the flasks. To reverse this, it would require an external energy making the reconvening of the particles back to the first flask a NONSPONTANEOUS PROCESS .

Answer:

lungs

Explanation:

The decreasing values of bond angle from 107º in NH3 to 91º in SbH3 down the group 15 elements of the periodic table owes to the decreasing electronegativity of the elements down the group.

The bond angle is the angle between any two bonds to a single atom.

The hydrides of group 15 elements form hydrides of the sort AH3 where A is the particular group 15 element.

Electronegativity is a periodic trend that decreases down the group and increases across the period.

As we move down group 15, atoms of elements become less electronegative and as such, repulsion between lone pair and bond pair and the repulsion between two bond pairs decreases. Ultimately, the bond angles  of the hydrides decrease also.

This accounts for the decreasing values of bond angle from 107º in NH3 to 91º in SbH3 down the group 15 elements of the periodic table.​

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Answer:

C                  

Explanation:

1. Earthquakes and Eruptions (volcanoes)

2. Divergent plate boundary

3. Apart from a widening valley, it equally contributes to steep mountain sides spreading. A mid-oceanic ridge is naturally produced if two oceanic plates naturally start moving away from each other.

1. When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere, producing a mid-ocean ridge. Extensional forces stretch the lithosphere and produce a deep fissure. When the fissure opens, pressure is reduced on the super-heated mantle material below. It responds by melting, and the new magma flows into the fissure. The magma then solidifies and the process repeats itself.

2. When two plate diverge from each other also known as divergent (di-apart, vergere- to inclined) plate margin .

Two plate diverge along oceanic ridges where new lithosphere is created.

Now come to the main point: Geological Features

When two oceanic plate diverge then new sea floor is created by a process called sea floor spreading and features like Mid oceanic ridges, volcanoes & Young lava flows forms. Ex. East Pacific Rise, Mid-Adlantic Ridge.

When two continental plates diverge by continental rifting then features like Rift valley, volcanoes are found. Ex of continent continent -East Africa rift vally, Red sea.

3. The major difference between different types is what type of plate the divergent boundary is between. If the boundary is found between two continental plates you are left with a rift valley. ... If two oceanic plates begin moving away from each other it creates a mid-oceanic ridge.

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The number of mole of HNO₃ that will be produced from the reaction of 57.0 g of NO₂ with excess water is 0.826 mole

First, we shall obtain the number of mole in 57.0 g of NO₂. This shown below:

Mole = mass / molar mass

Mole of NO₂ = 57 / 46

Mole of NO₂ = 1.239 mole

Finally, we shall determine the number of mole of HNO₃ produced. Details below:

3NO₂(g) + H₂O(l) → 2HNO₃(g) + NO(g)

From the balanced equation above,

3 moles of NO₂ reacted to produce 2 moles of HNO₃

Therefore,

1.239 mole of NO₂ will react to produce = (1.239 × 2) / 3 = 0.826 mole of HNO₃

Thus, we can conclude that the number of mole of HNO₃ produced is 0.826 mole

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According to the problem the specific heat of the metal is 0.0329 cal/g°C.

Specific heat is the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree. It is usually expressed in units of joules per kilogram-kelvin (J/kg-K). It is an important physical property of a substance that affects the rate of heat transfer.

The specific heat of a metal can be calculated using the equation, q = mcΔT,
where q is the amount of heat energy,
m is the mass of the metal sample,
c is the specific heat, and
ΔT is the change in temperature. In this problem, q = 10.57 g × c × (24.15ºC - 22.50ºC) = 2.85 g × c.
The amount of heat energy required to raise the temperature of the water bath can be calculated using the equation q = mcΔT,
where q is the amount of heat energy, m is the mass of the water bath,
c is the specific heat of water (4.184 J/g°C), and
ΔT is the change in temperature. In this problem, q = 104.0 g × 4.184 J/g°C × (24.15ºC - 22.50ºC) = 86.67 J.
The specific heat of the metal can be calculated by dividing the amount of heat energy required to raise the temperature of the metal sample by the amount of heat energy required to raise the temperature of the water bath. This gives us c = 2.85 g × c / 86.67 J = 0.0329 cal/g°C.
Therefore, the specific heat of the metal is 0.0329 cal/g°C.

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Answer:

salt (NaCl)

Explanation:

Pure substance is defined as the substance that consist of a single type of material and does not contain contaminants. A pure substance has uniform composition throughout the process.

sodium chloride (NaCl) also known as table salt is a pure substance because it has a uniform and definite composition that is  1:1 ratio of sodium and chloride ions.

Hence, the correct answer is "salt (NaCl)".

Answer:

Explanation:

Here, we want to get the equation of the reaction between Hydrochloric acid and Zinc metal

Zinc metal displaces the hydrogen from hydrochloric acid to form zinc chloride

We have the equation of reaction as:

Answer:

6.0 mol LiNO₃

Explanation:

First we need to determine which reactant is the limiting reactant:

We calculate with how many Ca(NO₃)₂ moles would 3.0 moles of Li₃PO₄ react, using the stoichiometric coefficients of the reaction:

There are not as many Ca(NO₃)₂ moles, so Ca(NO₃)₂ is the limiting reactant.

Using the number of moles of the limiting reactant, we calculate how many moles of LiNO₃ would be formed:

Answer:

12%

Explanation:

Answer:

3-12%

Explanation:

Im not completely sure if this is accurate, but hope with somewhat helps.

Answer:

soo sorry it took me this long to answer.

Explanation:

This is a question about acid-base neutralization. According to the search results, when a strong acid (HCl) and a strong base (KOH) are mixed in equal amounts, they react completely to form water and a salt (KCl). The pH of the final solution depends on the amount of excess H+ or OH- ions that remain after the reaction. To find the pH, we need to use the following equations:

pH = -log[H3O+] pOH = -log[OH-] pH + pOH = 14

First, we need to find the number of moles of HCl and KOH in the initial solutions. We can use the formula:

n = MV

where n is the number of moles, M is the molarity, and V is the volume.

For HCl:

n(HCl) = 0.7 M x 0.1 L = 0.07 mol

For KOH:

n(KOH) = 0.5 M x 0.1 L = 0.05 mol

Since HCl and KOH react in a 1:1 ratio, the limiting reactant is KOH. This means that all of the KOH will be consumed in the reaction, and some HCl will be left over. We can find the amount of excess HCl by subtracting the moles of KOH from the moles of HCl:

n(HCl)excess = n(HCl) - n(KOH) = 0.07 mol - 0.05 mol = 0.02 mol

The excess HCl will determine the pH of the final solution, since it will contribute to the concentration of H3O+ ions. To find this concentration, we need to divide the moles of excess HCl by the total volume of the final solution. The total volume is the sum of the initial volumes of HCl and KOH:

Vtotal = V(HCl) + V(KOH) = 0.1 L + 0.1 L = 0.2 L

The concentration of H3O+ ions is then:

[H3O+] = n(HCl)excess / Vtotal = 0.02 mol / 0.2 L = 0.1 M

Finally, we can use the pH equation to find the pH:

pH = -log[H3O+] = -log(0.1) = 1

The pH of the final solution is 1, which means it is acidic.

By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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A mixture can be defined as a physical blend of two or more substances that are not chemically combined.

They retain their own properties and can be separated by physical means like filtration, distillation, evaporation, or magnetism. The various types of mixtures include homogeneous mixtures, heterogeneous mixtures, and colloids.Homogeneous mixtures, also known as solutions, are uniform mixtures where the composition is the same throughout. They are not visibly different and consist of a solute (the substance being dissolved) and a solvent (the substance doing the dissolving). For example, salt water is a homogeneous mixture because the salt is dissolved uniformly throughout the water.Heterogeneous mixtures are non-uniform mixtures that consist of two or more phases, each with its own distinct properties. They can be seen with the eye, and the different components can be separated using physical means. An example of a heterogeneous mixture is oil and water. They can be mixed together, but they will eventually separate.Colloids are mixtures where the particle size is intermediate between that of a solution and a suspension. The particles are small enough to not be visible to the eye, but they are large enough to scatter light. Milk is an example of a colloid because it appears homogeneous but is actually made up of small particles of fat and protein dispersed throughout the liquid.In conclusion, a mixture is a physical blend of two or more substances that are not chemically combined. They can be separated by physical means and consist of homogeneous mixtures, heterogeneous mixtures, and colloids.

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Answer:

The reactions that might ensue are

Cl\(_{2}\)(g) + H\(_{2}\)O ----------  > HOCl + HCl

 HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)

Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl

Explanation:

The Disinfectant Given is

CI2 (g) at PH 9

Determine the chemical reactions that might ensue

due to the High concentration of \(H^{+} (aq)\) the formation of \(OCI^-\)(aq) will be better and this will decrease the power of the disinfectant.

Hence the chemical reactions that might ensue can be represented below as :

Cl\(_{2}\)(g) + H\(_{2}\)O ----------  > HOCl + HCl

            HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)

Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl

Quartz is not regarded as an example of a modified silicate.

This is defined as a hard, crystalline mineral composed of silica with a tetrahedral shape. Silica is also referred to as Silicon dioxide(SiO₂).

This type of mineral is a naturally occurring crystal and isn't a modified silicate but the rest can be modified using their respective constituents thereby making option D the most appropriate choice.

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Answer:

Decreases  

Explanation:

the pH of the aqueous solution is 8.51 with a hydrogen ion concentration of [H+]=3.1×\(10^-9\)M

The pH of the aqueous solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the hydrogen ion concentration of the solution.

Substituting the given value, we get:

pH = -log(3.1×\(10^-9\))

pH = 8.51

An aqueous solution is one in which water serves as the solvent. It is utilised in a variety of applications, including analytical chemistry, biochemistry, and industrial chemistry. It is the most prevalent kind of solution used in chemical reactions. Water serves as both the solvent and the solute in an aqueous solution, where the solute is often a solid, liquid, or gas. Due to its high polarity and capacity to make hydrogen bonds with other molecules, water is an excellent solvent that can dissolve a variety of materials, including polar molecules and ionic compounds. Acid-base reactions, redox reactions, and precipitation reactions are just a few of the numerous chemical processes that take place in aqueous solutions. A variety of variables can have an impact on an aqueous solution's characteristics.

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Answer:

wave length=speed/frequency

=345/229

Answer: The Fundamental units are as follows:

Explanation:

A fundamental unit is a tool used for measurement of a base quantity.

Velocity: It is defined as rate of displacement. Therefore units of displacement and time are involved the units of displacement are same as that of distance i.e. metre and that of time are second. therefore the units of velocity are metre per second.

Acceleration: It is defined as rate of change of velocity. Therefore units of acceleration involve velocity and time. The units of velocity Re metre per second and time is second. Therefore units of acceleration are meter's per second².

Work:  It is defined as product of force and displacement. Therefore units of work involve Force and displacement i.e. distance. Therefore units of work are kgm²/sec².

Pressure: It is Force per unit area. Therefore units of Pressure are kg/ms².

Power: It is Work/Time. Therefore units of power are kgm²/sec³.

Density: It is Mass/Volume. Therefore units of density are kg/m³.

Volume: The units of volume are m³.

Force: It is product of mass and acceleration. Therefore units of force are m/sec².

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Answer: a. meters per second(m/s) b. meters per second squared(m/s2)

c. Joule(J) d.Pascal(Pa) e. Watt(W) f. kilograms per meter cubed(kg/m3)

g. meter cube(m3) h.Newton(N)

Explanation: To find out the fundamental units of the quantities we need to use the SI units of the Fundamental Physical Quantities they are as follows:

Mass:- kg

Length:-m

time:-s

Now we know Velocity = displacement/time which means its units will be m/s,

Acceleration = velocity/time hence its units are m/s2,

Work = force/displacement here units of force is N, therefore, units of work are N/m which is known as Joule(J),

Pressure = force/area where units of area in m2 thus units of pressure are N/m2 which is known as Pascals(Pa),

Power = work/time, therefore, its units are J/s which is known as Watts(W),

density =mass/volume here units of volume are m3 therefore units of density are kg/m3

Volume is a derived unit from length and its units are m3, Force=mass*acceleration thus its units are kg*m/s2 which is known as Newton(N)

Answer:

The answer is "Strontium iodide and \(SrI_2\)".

Explanation:

In the flames test, two ionic metals give red fire. It was calcium (Ca, which gives a red brick flame) and strontium (Sr, which gives a persistent red flame). Both Ca and Sr respond to insoluble carbonate with ammonium carbonate. Ca and Sr produce insoluble ammonium phosphate phosphates. Even then, the water is reactive with calcium sulfate (CaSO4) whereas the strontium sulfate (SrSO4) is illiquid. Because the metal ion formed 3 precipitates, they can't get Ca, and we have Sr as its metal.

The hexane of its halide gives a violet color which would be typical of iodide (I-).

Strontium iodide is the chemical name of the unknown ionic compound.

Strontium iodide's chemical formula is \(SrI_2\).

7a. Using the mole ratio from the balanced chemical equation, we can set up the following proportion:

n(N₂)/n(NH₃) = 1/2

where n(N₂) is the number of moles of N₂ and n(NH₃) is the number of moles of NH₃. Solving for n(N₂), we get:

n(N₂) = (10.0 mol NH₃) / (2 mol N₂/mol NH₃) = 5.00 mol N2

Therefore, 5.00 moles of nitrogen would be needed to make 10.0 moles of ammonia.

7b. Using the same mole ratio as above, we can set up the following proportion:

n(NH₃)/n(H₂) = 2/3

where n(H₂) is the number of moles of H₂. Solving for n(NH₃), we get:

n(NH₃) = (9.00 mol H2) x (2 mol NH3/3 mol H₂) = 6.00 mol NH₃

Therefore, 6.00 moles of ammonia could be made by completely reacting 9.00 moles of hydrogen.

7c. Again, using the same mole ratio as above, we can set up the following proportion:

n(N₂)/n(H₂) = 1/3

where n(N₂) is the number of moles of N₂. Solving for n(H₂), we get:

n(H₂) = (7.41 mol N2) x (3 mol H₂/1 mol N₂) = 22.2 mol H₂

Therefore, 22.2 moles of hydrogen would be needed to react completely with 7.41 moles of nitrogen.

8a. The amounts of reactants consumed and the amount of product made can be calculated using stoichiometry, which is based on the mole ratio from the balanced chemical equation. However, the mole ratio from the balanced chemical equation cannot be interpreted as a ratio of masses, since the molar mass (and thus the mass) of each substance is different.

8b. The mole ratio from the balanced chemical equation is based on the number of moles of each substance, which is proportional to the mass of each substance. Therefore, by using the molar mass of each substance, we can convert the mole ratio to a mass ratio. However, the mole ratio itself cannot be interpreted as a ratio of masses.

9a. Yes, the mole ratio from a balanced chemical equation can be interpreted as a ratio of masses. This is because the mole ratio is determined based on the stoichiometric coefficients in the balanced equation, which represent the number of moles of each substance involved in the reaction. Since the molar mass (mass per mole) of each substance is known, the mole ratio can be used to determine a mass ratio.

9b. The mathematical concept that explains how the mole ratio from a balanced chemical equation can be interpreted as a ratio of masses is the mole-to-mole conversion factor. This conversion factor is based on the stoichiometric coefficients in the balanced equation, which represent the mole ratio between the reactants and products. By multiplying the mole ratio by the molar mass of a substance, the ratio can be converted to a mass ratio.

To solve the problem "What mass of nitrogen is needed to produce 30.0 g of ammonia?", we would need to use the concept of stoichiometry and mole-to-mole conversions. We can start by writing the balanced chemical equation for the reaction:

N₂(g) + 3H₂(g) → 2NH₃(g)

From the equation, we can see that the mole ratio of N2 to NH₃ is 1:2. We can use this ratio to determine the number of moles of N2 needed to produce 1 mole of NH₃:

1 mole N₂ : 2 moles NH₃

Next, we can use the molar mass of NH₃ to convert the moles of NH₃ to grams:

2 moles NH₃ x 17.03 g NH₃/mole = 34.06 g NH₃

So, for every 34.06 g of NH₃ produced, we need 1 mole of N₂. Using this information, we can set up a proportion to solve for the mass of N₂ needed to produce 30.0 g of NH₃:

1 mole N₂ : 34.06 g NH₃ = x moles N₂ : 30.0 g NH₃

Solving for x, we get:

x moles N₂ = (30.0 g NH₃ x 1 mole N₂) / 34.06 g NH₃ = 0.881 moles N₂

Finally, we can convert the moles of N₂ to grams using the molar mass of N₂:

0.881 moles N₂ x 28.01 g N₂/mole = 24.67 g N₂

Therefore, we would need 24.67 g of nitrogen to produce 30.0 g of ammonia.

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