1 25ml sample of 0.25m potassium carbonate solution is added to a 30 ml of a 0.4m barium nitrate solution. what is the concnetration of the excess metal ion after hte prceipiaton reaction is complete

No substance's Lewis structure will ever show an unfinished octet.

With fewer than eight valence electrons, certain atoms of specified elements can form stable bonds. When this occurs, the atom of the element included in the molecule is thought to retain a partial octet.

Boron, aluminum, beryllium, and hydrogen are typical examples of these elements, all of which are stable with just two valence electrons (stable with only 6 valence electrons). For all other periods below period 1, this is comparable to the octet rule, with the exception of hydrogen, where a noble gas structure should be assigned two valence electrons instead (like He).

The valence electrons in stable compounds that do not have a noble gas structure can be produced by covalent compounds in groups 2 and 3.

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The over all spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.

The over all spatial arrangement of atoms in a protein is called as conformation. The primary structure of protein is called as amino acid.  the local spatial arrangement of the polypeptide chain is explained the  secondary structure. the overall spatial arrangement is called as conformation. The native conformation is the  conformation of functional protein.

Thus, The over all the spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.

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The number of moles of HCl produced along with the 2.9 moles of H₃PO₄ is 14.5 moles

From the question, we are to determine the number of moles of HCl that are produced along with 2.9 moles of H₃PO₄

The given balanced chemical equation of the reaction is

PCI₅ + 4H₂O ---> H₃PO₄ + 5HCI

From the balanced chemical equation,

1 mole of PCI₅ reacts with 4 moles of H₂O to produce 1 mole of H₃PO₄ and 5 moles of HCI

Now,

If 2.9 moles of H₃PO₄ are produced from the reaction,

Then,

5 × 2.9 moles of HCl will be produced along with the H₃PO₄

5 × 2.9 =  14.5 moles

Hence, the number of moles of HCl produced is 14.5 moles

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0.72M is the concentration of cl-1 ions when 10.0g of calcium chloride (Cacl2) is dissolved in a solution with a total volume of 250.0ml.

The key here is to realize that a solution of calcium chloride, CaCl2, will always contain twice as many chloride anions, Cl−, than calcium cations, Ca2+.

This means that one mole of calcium chloride, which contains one mole of formula units of calcium chloride, will have one mole of calcium cations, 1× Ca2+ two moles of chloride anions, 2×Cl−.

The sample given to you contains

10.0g ×mole CaCl2 /110.98g

= 0.0901 moles CaCl2

The solution will thus contain

{0.0901moles Ca2+, 2× 0.0901 moles Cl−}

The two ions' respective concentrations will be

[Ca2+]= Ca2+ 0.0901 moles/ 250× 10^-3

= 0.36M

[Cl−]=  Cl−2× 0.0901moles/ 250× 10^-3= 2× 0.36

M= 0.72M

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The empirical formula for the compound is CH₂

The empirical formula is a formula that states the ratio of the number of elements that make up the simplest molecule. While the molecular formula is the actual formula that states the number of elements that make up a molecule.

Calculated the number of moles of different atoms.

Number of moles of Carbon:

n = (given mass of  carbon)/(molar mass of carbon)

= 2.64 g/12.011 gmol⁻¹

= 0.220 mol

Number of moles of Hydrogen:

(given mass of hydrogen)/(molar mass of hydrogen)

= 0.444 g/1.008 gmol⁻¹

= 0.440 mol

Ratio of carbon:

= 0.220/0.220

= 1

Ratio of hydrogen:

= 0.444/0.220

= 2

The ratio of C : H : O = 1 : 2

So, the empirical formula is CH₂

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[CO(en)₃]³⁺   is more stable than [CO(CH₃NH₂)]³⁺ to make more stable complex because of chelate effect.

[CO(en)₃]³⁺  is a metal chelate due to presece of bidentate ligand ethylene diamine ligand. Metal chelates are more stable than complexes containing only monodentate ligands because of the chelate effect, we expect ethylenediamine to form a stronger complex with Co than ammonia.

The Chelate Effect is that complexes resulting from coordination with the chelating ligand is much more thermodynamically stable than complexes with non-chelating ligands.

The chelate effect defined as  the augmented affinity of chelating ligands for any metalic ion in comparison of the affinity of a similar nonchelating ligands for the same metallic ion.

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The correct oxidation numbers are as follows;

Oxidation states or oxidation numbers are the hypothetical charges of atoms when all bonds to various atoms are fully ionic. Represents the degree of oxidation of atoms in a compound. Conceptually, the oxidation state can be either positive, negative, or zero.

The oxidation number of an atom indicates how many electrons the atom gained or lost when the substance was formed.

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The number of molecules present in 34.20 grams of sugar is 6.02*10²⁴.

Solution:

1 mole of any compound contains Avogadro's number of molecules.

Number of moles = mass/molar mass

Number of moles = 34.2/342

Number of moles = 0.1

Number of molecules in 1 mole of sugar = 6.02*10²³

Number of molecules 0.1 moles of sugar = 0.1/6.02*10²³

Number of molecules = 6.02*10²⁴

To determine the number of molecules needed first determine the molecular weight of one mole of the substance then divide the molar mass value by the molecular weight and multiply by the Avogadro constant. The molar mass of a substance is the mass of 6.022 × 1023 atomic molecular or formula units of that substance. The number of grams in a mole is always equal to the number of atomic mass units representing atomic molecular and formula masses.

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This body part in squid allows them to propel themselves rapidly by sucking in through the mantle and out through the siphon.

The siphon is a large tube at the bottom of the giant squid's body and allows it to move. The giant squid draws air into a siphon and pushes the air out to propel itself forward.

Squids have a tubular bodies and small rod-like internal structures called pens, which help support the squid's body. The mantles help protect the cavity of the squid, as well as help it move, as they suck water in and then push it out.

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Answer:

3CO + Fe₂O₃ = 2Fe + 3CO₂

The molecular mass of a unknown gas would be 36g/mol.

According to Graham's law of Effusion , we can find the molecular mass of a unknown gas. Rate of effusion of gas 1 / rate of effusion of gas 2 = square root of molecular weight of helium gas / molecular weight of unknown gas.

                                  (1/3) / 1 = (square root of 4g/mol)/ MW of x

                                          =   36 gm/mol

Graham's Law states that the rate of effusion of a gas is inversely proportional to square root of the density of the gas. Since equal volumes of gas at the same temperature and pressure contain equal number of gas molecules, the rate of effusion is also inversely propotional to the square root of molecular weight of the gas. The gas with the lowest molecular weight effuses the fastest and vice versa.

Law deals with the rate at which a gas will escape from a pinhole into a vaccum, which is different from Graham's law of diffusion.

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The solubility product constant of this salt is 0.00625 M.

A compound's capacity to dissolve in a given substance is known as its molar solubility (M), which is a unit of measurement. Molar solubility is measured as moles/L and is more specifically the maximum number of moles of a solute that can dissolve in one litre of solvent.

The quantity of moles dissolved in a solution volume of 1 L is known as its molar solubility.

When BaF2 breaks down,

BaF₂ → Ba₂⁺ + 2F⁻

If BaF2 has a molar solubility of X and Ba₂+ and F have molar solubilities of X and 2x, respectively, the solubility product constant -ksp is calculated as follows:

ksp = [Ba²⁺][F⁻]²

ksp = X × (2X)²

ksp = 4X³

since ksp = 7.5 x 10⁻³

4X³ = 7.5 x 10⁻³

X = 0.00625 M

BaF₂ has a 0.00625 M molar solubility.

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In the reaction

2Mg(s)+CO₂(g)→2MgO(s)+C(s)

The reactant which is going to oxidised is Mg(s) and the reactant which is going to reduce is CO₂(g).

Oxidation is defined as the loss of electron from the element, whereas reduction is defined as the gain of electron done by the element. When any element is present in solid form, its oxidation state is zero. Hence, the oxidation state of Mg(s) and C(s) is zero. The oxidation state of O is -2. On product side, the oxidation state of Mg is

x+(-2)=0

x-2=0

x=+2

The oxidation state of Mg is increased from zero(0) to 2. Hence, Mg(s) is oxidised.

The oxidation state of C in CO₂(g) is

x+2(-2)=0

x+(-4)=0

x-4=0

x=4

The oxidation state of C is decreased from +4 to 0. Hence, C in CO₂ is reduced in the reaction.

Therefore, the reactant which is going to oxidised is Mg(s) and the reactant which is going to reduced is CO₂(g).

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Although it is more frequently referred to as lactic acid, the IUPAC nomenclature for it is 2-hydroxypropanoic acid.

Whether in a linear chain or a ring, the main chain of carbons joined by a single bond serves as the basis for IUPAC nomenclature. According to a particular set of priorities, all deviations, whether numerous links or atoms other than hydrogen and carbon are denoted by prefixes or suffixes.

Therefore, the IUPAC name is 2,5,5-trimethyl-2-hexene. The blockchain in example (2) that contains both carbon atoms from the double bond is five atoms long. There is a six chain present, but there is only one double-bonded carbon atom in the chain. Consequently, this compound's root name will be

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Taking into account the reaction stoichiometry, the minimum number of grams of ClO₂ that a chemistry must use to make 50 g of HClO₃ is 47.92 grams.

In first place, the balanced reaction is:

6 ClO₂ + 3 H₂O  → 5 HClO₃ + HCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 422.25 grams of HClO₃ are formed from 404.7 grams of ClO₂, 50 grams of HClO₃ are formed from how much mass of ClO₂?

mass of ClO₂= (50 grams of HClO₃× 404.7 grams of ClO₂)÷ 422.25 grams of HClO₃

mass of ClO₂= 47.92 grams

Finally, 47.92 grams of ClO₂ is required.

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The significance of the Ronald Cotton case, that a person can be convicted without individual evidence. Therefore, option D is correct.

Evidence is something or information used to increase or decrease the likelihood that a fact exists. Evidence can be testimony, written materials, visual or audio recordings, DNA samples, or other physical artifacts.

In essence, evidence is utilized to support a claim made by people or organizations who think something is real or a fact. Evidence may also be used to debunk or dispute a fact or claim that others don't agree with or believe to be incorrect.

Thus, option D is correct.

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The change in temperature of the system is 2.28 °C.

The change in temperature of the system depends on the heat released. The total heat received by the system will equal to total heat released by objects. It should follow

Q released = Q received

The heat can be defined by

Q = m . c . ΔT

where Q is heat, m is mass, c is the specific heat constant and ΔT is the change in temperature.

The given parameters are

Q = 75.4 J

n = 0.25 mol

Mr CCl₄ = 153.8 g/mole

c = 0.861 J / g. °C

Find the mass of CCl₄

n = m / Mr

0.25 = m / 153.8

m = 38.45 grams

Find the change in temperature

Q = m . c . ΔT

75.4 = 38.45 . 0.861 . ΔT

ΔT = 2.28 °C

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The amount of Sr90 remained after a) 19 a is 0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This emission is known as radioactive decay.

What is radioactive decay?

Radioactive decay is a process in which any unstable nucleus loses its energy in the form of radiation. Different types of decays include beta decay, alpha decay and gamma decay in which there is a loss of one or more molecule in the form of radiation.

In radioactive decay,  half life of any atomic nuclei is  the time in which the nucleus becomes half of its initial mass.

λ = 0.693 / t1/2 = 0.693 / 28.1 per year.

t = [2.303 /λ] * log [a / a-x]

a) 19 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.203 = log [10^-6 / a-x]

a - x = 0.625 x 10^-6 g

b) 75 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.803 = log [10^-6 / a-x]

a - x = 0.157 x 10^-6 g

Therefore, the amount of Sr90 remained after a) 19 a is  0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This process is done by beta decay.

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Compared to chlorine, sodium is significantly more likely to exist as a cation. This is so because chlorine ionizes with a higher energy than sodium.

The ionization energy is the minimal energy needed to remove the valence electron that is weakly bound from the isolated gaseous atom. As a result, removing one electron from sodium is simple since it will adopt the structure of a noble gas and become stable. Chlorine, however, does not fall into this category, so it has a higher ionization energy than sodium. Because chlorine has a higher ionization energy than sodium, sodium is much more likely to exist as a cation.

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The conversion of 1 g of liquid water to 1 g of water vapor, removes heat from the surrounding environment.

Water vapor, water vapor, or aqueous vapor is the gaseous section of water. it's far one state of water in the hydrosphere. Water vapor can be made out of the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like the maximum elements of the environment.

Water vapor is water in gaseous rather than liquid form. it may be fashioned both through a technique of evaporation or sublimation. not like clouds, fog, or mist that is surely suspended debris of liquid water within the air, water vapor itself cannot be seen because it's miles in gaseous form.

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The pH of the final product is 7.

The quantity of hydrogen and hydroxyl ions in a solution determines pH. The negative logarithm of the hydrogen ion concentration is another name for pH.

A solution's pH defines how basic and how acidic it is. It establishes how many protons have been released or given. We have the situation as it stands.

0.20 molar HCL after titrating 0.056 molar koh.

20 ml of the solution yield a pH of 7.

Consequently, the given solution's pH value is 7.

Titration is employed in quantitative tests to keep the solution's concentration constant. The balancing of volume and concentration can be distinguished by a subtle shift in color.

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The correct equation to use when performing calculations involving the dilution of a solution is Option c) Mconc × Vconc = Mdil × Veil.

Dilution is the procedure of reducing the concentration of a solute in an answer, usually truly by way of blending with an extra solvent like including more water in the solution. To dilute a solution approach to feature greater solvents without the addition of greater solute.

Dilution is the manner of lowering the concentration of a given solute in its answer. The chemist can do it surely by way of blending with more solvent. as an example, we are able to upload water to the focused orange juice to dilute it till it reaches a concentration so that it will be great to drink.

Dilution is the method of lowering the attention of a solute in an answer, usually certainly by mixing with a greater solvent like including more water in the solution. To dilute a solution way to feature more solvents without the addition of greater solute.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Which is the correct equation to use when performing calculations involving the dilution of a solution?.

a) Mconc/Vconc = Mdil/Vdil

b) Mconc × Vdil = Mdil × Vconc

c) Mconc × Vconc = Mdil × Vdil

d) Vconc/Mconc = Vdil/Mdil

The freezing point of a solution that contains 78. 8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0. 877 g/mL) is

First we need to find out the mass of benzene using volume and density. The formula of density is

density=mass×volume

Rearrange and solve for the mass of benzene

mass=density×volume

mass=0.877g×722 mL/mL

mass=633.194 g

Convert this mass in kg

633.194 g×(1 kg/1000 g)=0.633194 kg

To find freezing point of solution, first we need to find out ΔT_f which is given as

Δ(T_f)=i×(K_f)×m

Where, m-molality

i- Van't hoff factor=1 (as naphthalene is non-electrolyte)

(K_f) = 4.90°C/m

Molality is calculated using formula

molality=(moles of solute/mass of solvent)

The solute is naphthalene and its moles is

mole = 78.8 g×(1 mol/128.16 g)

=0.61486 mol

Hence, the molality of solution is

molality=(0.61486 mol/0.633194 kg)

=0.97104 mol/kg

=0.97104 m (∵m=mol/kg)

Plug all values in the formula

Δ(T_f)=1×(4.90°C/m)×0.97104 m

Δ(T_f)=4.7581°C

The another formula of Δ(T_f) is

Δ(T_f)=T_f(solvent)-T_f(solution)

Rearrange formula for T_f(solution)

T_f(solution)=T_f(solvent)-Δ(T_f)

∴T_f(solution)=(5.50-4.7581)°C

∴T_f(solution)=0.7419°C

T_f(solution)=0.74°C

Therefore, the freezing point of a solution is 0.74°C.

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The weaker the forces between the particles, the father apart the particles will be. The attraction between the particles is due to the intermolecular force of attraction between them.

What are intermolecular forces?

The intermolecular force is an attractive force between the positive component of one atom to the negative component of another atom. There are 4 types of attractive forces namely, hydrogen bonds, dispersion, dipole-dipole and ion-dipole.

The particles are attracted to each other due to the intermolecular force between them. the stronger the force of attraction, the nearer the particles will be.

Therefore, the weaker the intermolecular forces between the particles, the farther apart the particles will be.

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62.22L volume of oxygen gas is produced throughout the electrolysis process of 100.0 ml of water.

Equation:

Volume of water equals 100.0 ml.

Water has a density of 1.000g/ml.

Mass of water = Density x volume

Mass of water = 1.000g/ml x 100ml

= 100g.

Water has a molar mass of 18 g/mol.

Mass / molar mass

= 100/18

= 5.55 moles of water.

Using the partial equation

2H2O ------> O2 + 4H+ + 4e- (oxidation)

At STP, 1 mole of oxygen gas is created from 2 moles of water.

Therefore, at STP,

5.55 moles of water will result in

⇒1/2 x 5.55

= 2.77 moles of oxygen.

One mole of oxygen takes up 22.4L at STP.

Therefore, 2.77mol will take up

⇒2.77 x 22.4

= 62.22 Liters.

As a result, 62.22L of oxygen gas were produced throughout the electrolysis process.

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The molar mass of Mg(OH)2 is 58.3 g mol−1.

The relative atomic mass of an element indicates its mass compared to the mass of atoms of other elements. Carbon has a relative atomic mass of 12 and magnesium has a relative atomic mass of 24. This means that each magnesium atom has twice the mass of a carbon atom. Atomic weights related to 1/12th the mass of a carbon atom are called relative atomic masses.

It is called the relative atomic mass because it compares the atomic mass to 1/12 the mass of a carbon atom. Relative mass is the average atomic mass of all isotopes present expressed as a percentage, and absolute mass is the sum of proton number and neutron mass. As the speed of an object approaches the speed of light, its relativistic mass m becomes infinite.

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Food group has the largest carbon footprint and requires the most water to produce is bovine meat

The carbon footprint is the total amount of greenhouse gases that are generated by our action and the average carbon footprint for a person in the united state is 16 tons and one of the highest rates in the world and globally the average carbon footprint is closer to 14 tons and beef has the highest carbon footprint of any food and this is because of what is required to raise and farm cattle and animals used for beef production require a tremendous amount of feed and which must be grown on its own and they also produce an extremely high amount of methane and meat as well as cheese and eggs have the highest carbon footprint and in the fruits, vegetables as well as beans and nuts have much lower carbon footprint

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Bradys test is the test used for the qualitative analysis of different types of ketones.

the name of the reagent used in the Bradys test is  2,4-dinitrophenylhydrazine.

it reacts with aldehyde and ketones to give coloured precipitate. 2,4-DNP is red in colour but when it reacts with ketone it gives an orange colour and if it reacts with carbonyl compound and aromatic compound then it gives red precipitate.

now talking about 4-methylacetophenone .yes Bradys test gives positive response to this compound.

when 4-methylacetophenone reacts with 2,4-DNP it gives red precipitate due to hydrazone formation.

bradys give positive test for ketones & aldehyde.

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The empirical formula of the sample is KCrO₄

Given that :

Potassium , K = 2.087 g

molar mass of potassium = 36 g/mol

Chromium , Cr = 2.775 g

molar mass of chromium = 52 g/mol

Oxygen , O =  2.988 g

molar mass of oxygen = 16 g/mol

the number of moles of potassium = mass / molar mass

                                                          = 2.087 / 36

                                                          = 0.05 mol

the number of mole of chromium = mass / molar mass

                                                        = 2.775 / 52

                                                         = 0.05 mol

the number of moles of oxygen = mass / molar mass

                                                     = 2.988 / 16

                                                     = 0.18 mol

now diving by the smallest number, we get

moles of K = 1

moles of Ce = 1

moles of O = 4

the empirical formula for the sample is  KCrO₄

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