Determine the concern traction in [M] of a solution that has an absorbance of 0.420

Answer:

What is the formula of oxide? You use the formula to determine so u have to find the number of mole first

Answer:

1 molecule of oxygen has 2 atoms.

So 2,25 molecules of oxygen have 2 x 2,25 atoms.

2 x 2,25 = 4,5 atoms

There are 4,5 atoms in 2,25 molecules oxygen.

BaO has ionic bonds because of electronegative difference.

Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical compound by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom gains electrons, it becomes a negatively charged ion (cation), while if it loses them, it becomes a positively charged ion (cation) (anion). Following is a brief discussion of ionic bonds. To learn more, go to chemical bonding: the ionic bonding process.

Ionic or electrovalent compounds are produced by ionic bonding, and the compounds formed between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound. Actually, a polar covalent bond is the extreme form of an ionic bond.

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The World Health Organization (WHO) estimates that each individual needs between 50 and 100 litres of water per day to guarantee that their basic needs are met and that they have few health issues.

For the majority of basic needs to be met and few health issues to materialise, the World Health Organization (WHO) states that between 50 and 100 litres of water per person per day are required.

The Assembly declared that every individual has the right to obtain enough water for personal and domestic needs, which equates to between 50 and 100 litres of water per person per day. The water must be suitable, acceptable, and reasonably priced.

A family is given three buckets of water each day. The 50 litres of water per person per day that the United Nations advises is. A family receiving three buckets of water per day does not indicate a water shortage.

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the limiting reagent is nitrogen gas.

steps:

write out balanced equation: 3H2 + N2 = 2NH3

convert to moles to find how much NH3 each yields

find molar mass of each

10 g H2 (1 mol/2.016g) (2NH3/3H2) = 3.31 mol NH3

26g N2 (1mol/28.02g)(2NH3/1N2)=1.86 mol NH3

since N2 yields less NH3, it is the limiting reagent.

Answer:

643(%=:(¥75 )(:7$"8"),"7$"()9_/"¥?:

Answer:

\(\% H_2O=51.2\%\)

Explanation:

Hello!

In this case, since the percent water is computed by dividing the amount of water by the total mass of the hydrate; we infer we first need the molar mass of water and that of the hydrate as shown below:

\(MM_{MgSO_4* 7H_2O}=120.36 g/mol+7*18.02g/mol\\\\MM_{MgSO_4* 7H_2O}=246.5g/mol\)

Thus, the percent water is:

\(\% H_2O=\frac{7*MM_{H_2O}}{MM_{MgSO_4* 7H_2O}} *100\%\\\\\)

So we plug in to obtain:

\(\% H_2O=\frac{7*18.02}{246.5} *100\%\\\\\% H_2O=51.2\%\)

Best regards!

Answer:

No.

Explanation:

Under TLC chromatography, the compounds are separated based on the different affinity between stationary phase and mobile phase. The higher difference between Rf's of the compounds will produce the better separation.

In Hexane compound A has a Rf of 0.35 and compound B of 0.45.

The difference is 0.45 - 0.35 = 0.10

In dietyl ether, Rf of compound A is 0.45 and for compound B is 0.60.

The difference is 0.60 - 0.45 = 0.15.

As the difference in Rf is higher for dietyl ether:

Hexane would be better for separating a mixture of compounds A and B by TLC. NO. The better separation would be using dietyhl ether.

Answer:

50% ISOPROPANOL / H2O - 1

25% ISOPROPANOL / H2O - 2

Pure water - 4

ISOPROPANOL / H2O - 3

Explanation:

More Isopropanol concentration is least polar. When the isopropanol is mixed with water its polarity increases. Pure water is most polar. The polarity of a substance is dependent on its ability to bent and mold in the shape as required.

Note that convection currents in the mantle drive plate tectonics, causing the event. These currents push and pull on plates, creating divergent, convergent, and transform boundaries. This event is caused by plate interaction at divergent or convergent boundaries.

Divergent and convergent boundaries can be found along plate tectonic boundaries such as mid-oceanic ridges and subduction zones.

Convection currents are the movement of material in a fluid or solid due to differences in temperature and density. In the context of plate tectonics, convection currents in the Earth's mantle drive the movement of the tectonic plates. These currents are thought to be driven by heat from the Earth's interior and the cooling and sinking of dense materials at the surface.

Note that in the attached image, the lines in red mark the divergent and convergent boundaries and where they can be found.

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Answer

6.59 L

Explanation

Given:

Pressure 1 (P1) = 2.5 atm

Pressure 2 (P2) = 8.5 atm

Volume 1 (V1) = 22.4 L

Required: Volume 2 (V2)

Solution:

Step 1: To solve this problem, we will use Boyles Law of gasses

Step 2:

P1V1 = P2V2

V2 = (P1V1)/P2

V2 = (2.5 atm x 22.4 L)/8.5 atm

V2 =

Answer: 6.25 L

Explanation:

Charles Law  V1/T1 = V2/T2

Convert temperature to Kelvin by adding 273.15

V2 = V1T2/T1

V2= 6.4 X 293.15/300.15 = 6.25 L

Answer:

2Fe2O3 + 3C → 4Fe + 3CO2

Explanation:

The balanced reaction of Ferric oxide with carbon to form Iron and Carbon dioxide can be written as follows:

\(2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}\)

The moles of iron produced is\(16.2*10^{-1}\)

Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.

The atoms of Oxygen on reactant side is 3 while on product side is 2 so multiply Ferric oxide by 3 and carbon dioxide by 3

so now our equation becomes

\(2Fe_{2} O_{3} +C\rightarrow Fe+3CO_{2}\)

The number of Carbon atoms on left side is one while on right side it is 3 so multiply by 3

\(2Fe_{2} O_{3} +3C\rightarrow Fe+3CO_{2}\)

The number of Iron atoms on left is 4 while on right it is 1 so multiply by 4

\(2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}\)

From 2 moles of Ferric oxide 4 moles of iron is produced

from 1 mole mole of ferric oxide 2 moles of Iron is produced

From \(8.1*10^{-1}\) mole of ferric oxide 2×\(8.1*10^{-1}\) moles of iron are produced.

Hence the balanced equation is

\(2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}\)

the number of mole of Iron is \(16.2*10^{-1}\)

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Answer:

In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding

The correct option is D. loss of electrons.

Loss of electrons is the statement best describes the process of oxidation.

Chemical reaction known as oxidation is described as a procedure that takes place when atoms or group of atoms lose electrons. If a chemical species gains oxygen or loses hydrogen, that is an example of oxidation. Oxidation takes place when these things happen.

An oxidising agent is any substance that causes another chemical lose electrons (become oxidised). On the other hand, a reducing agent is any chemical that causes another chemical to gain electrons.

The biochemical oxygen demand of wastewater is reduced after oxidation, which also reduces some contaminants' toxicity. Some contaminants undergo this treatment and are transformed into carbon dioxide, water, and biosolids. Disinfection is frequently accomplished using chemical oxidation.

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Answer:

The answer is Chromatography, I believe.

Explanation:

Chromatography is the method used to separate the color pigments in ink or other liquids.

Answer:

Sr

Explanation:

Sr has an ionization of 550 whereas Ba has an ionization of 503

Answer:

1.6x10¹¹ = Kc

Explanation:

For the reaction:

AgCl(s) + 2CN⁻(aq) ⇄ Ag(CN)₂⁻(aq) + Cl⁻(aq)

Kc is defined as:

Kc = [Ag(CN)₂⁻] [Cl⁻] / [CN⁻]²

Ksp of AgCl is:

AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq)

Where Ksp is:

Ksp = [Ag⁺] [Cl⁻] = 1.6x10⁻¹⁰

In the same way, Kf of Ag(CN)₂⁻ is:

Ag⁺(aq) + 2CN⁻ ⇄ Ag(CN)₂⁻

Kf = [Ag(CN)₂⁻] / [CN⁻]² [Ag⁺] = 1.0x10²¹

The multiplication of Kf with Ksp gives:

[Ag⁺] [Cl⁻] *  [Ag(CN)₂⁻] / [CN⁻]² [Ag⁺] = Ksp*Kf

[Ag(CN)₂⁻] [Cl⁻] / [CN⁻]² = Ksp*Kf

Obtaining the same expression of the first reaction

That means Ksp*Kf = Kc

1.6x10⁻¹⁰*1.0x10²¹ = Kc

(a) the molecular formula of the compound is C₆H₁₂.

(b)  the molecular formula of the compound is NH₂Cl.

(a) Given the empirical formula CH₂ and a molar mass of 84 g/mol, we need to determine the molecular formula. To do so, we need to find the factor by which the empirical formula needs to be multiplied to achieve the given molar mass.

The empirical formula CH₂ has a molar mass of 14 g/mol (12 g/mol for carbon + 2 g/mol for hydrogen).

To find the factor, we divide the molar mass by the empirical formula mass:

Factor = (molar mass) / (empirical formula mass) = 84 g/mol / 14 g/mol = 6

Therefore, the molecular formula is obtained by multiplying the empirical formula by the factor:

CH₂ × 6 = C₆H₁₂

Thus, the molecular formula of the compound is C₆H₁₂.

(b) Given the empirical formula NH₂Cl and a molar mass of 51.5 g/mol, we follow a similar approach.

The empirical formula NH₂Cl has a molar mass of 51.5 g/mol (14 g/mol for nitrogen + 2 g/mol for each hydrogen + 35.5 g/mol for chlorine).

To find the factor, we divide the molar mass by the empirical formula mass:

Factor = (molar mass) / (empirical formula mass) = 51.5 g/mol / 51.5 g/mol = 1

Therefore, the molecular formula is the same as the empirical formula: NH₂Cl

Hence, the molecular formula of the compound is NH₂Cl.

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Answer:

To avoid variation due to concentration

Explanation:

Hope this helps :)

Explanation:

if we have a neutral 15N is means that the atomic mass of it is 15.

So it has:

7 protons

7 electrons

and 15-7 = 8 neutrons

Answer: 7 protons, 7 electrons and 8 neutrons.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

The  ions has the noble - gas electron arrangement. The following ions has a noble gas electron arrangement is Ti⁴⁺ .

The atomic number of the titanium is 22. The symbol of the titanium is Ti.

The electronic configuration of Ti is as follows :

Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² or [Ar] 3d² 4s²

The Ti⁴⁺ means the titanium losses the four electrons and form the positively charged ion called as cation.

The electronic configuration of Ti⁴⁺ is as follows :

Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ or [Ar]

Thus, the Ti⁴⁺  ions has a noble gas electron arrangement.

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Answer:

Intramolecular forces are the forces that hold atoms together within a molecule. Intermolecular forces are forces that exist between molecules.

Explanation:

Answer:

1. Percentage yield = 57.2%

2. Percentage error = 74.9%

Explanation:

From the question given above, the following data were obtained:

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage yield =?

Percentage error =?

1. Determination of the percentage yield.

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage yield =?

Percentage yield = Actual yield /Experimental yield × 100

Percentage yield = 5.06 / 8.85 × 100

Percentage yield = 57.2%

2. Determination of the Percentage error.

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage error =?

Percentage error = |Experimental – Actual| / Actual yield × 100

Percentage error = |8.85 – 5.06| / 5.06 × 100

Percentage error = 3.79 / 5.06 × 100

Percentage error = 74.9%

Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer: The mass of water produced is 507.6 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

Given mass of glucose = 846 g

Molar mass of glucose = 180 g/mol

Plugging values in equation 1:

\(\text{Moles of glucose}=\frac{846g}{180g/mol}=4.7 mol\)

The given chemical equation follows:

\(C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O+energy\)

By the stoichiometry of the reaction:

If 1 mole of glucose produces 6 moles of water

So, 4.7 moles of glucose will produce = \(\frac{6}{1}\times 4.7=28.2mol\) of water

Molar mass of water = 18 g/mol

Plugging values in equation 1:

\(\text{Mass of water}=(28.2mol\times 18g/mol)=507.6g\)

Hence, the mass of water produced is 507.6 g

Answer:

The three pKa values for phosphoric acid (H3PO4) are 2.12, 7.21, and 12.32.

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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