a sample of ore containing manganese weighed 1.2354 grams. this sample was heated in a solution of nitric acid, which dissolved the manganese ion producing manganese(iii) nitrate (mn(no3)3). the acidity of the solution was adjusted, and hydrogen sulfide gas was bubbled into the solution producing 0.2876 grams of manganese(iii) sulfide (mn2s3). what is the percentage of manganese in the original sample?

There  one possible model that could be inferred from Rutherford's data is presence of protons and electrons revolves. Rutherford proposed the model of atom.

Rutherford atomic model  states that the positive charge are concentrated in ab small area. this region is called as nucleus. Rutherford explains that negatively charged electrons surround the nucleus. According to Maxwell, accelerated particles emit the radiation , so that electron revolve around the nucleus emit radiations. Rutherford unable to explain with Maxwell's theory and unable to explains stability of an atom.

Thus, There  one possible model that could be inferred from Rutherford's data presence of protons and electrons revolves. Rutherford proposed the model of atom.

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( 5.6 g / kg ) ( 1.03 kg / L ) ( 1 mol / 58.44 g ) = 0.0987 mol NaCl / L

Its density is the amount of "stuff" that can be packed into a given amount of space. For instance, a slab of both the softer element lead (Pb) and the harder, denser component gold (Au) will simply be denser (Au). Bricks are more dense than Styrofoam blocks. Its definition is bulk per unit of volume.

Density is an important concept because it allows us to forecast which compounds will fly and those that will sink in a liquid. An object will frequently float as long as its density is less than that of the liquid.

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The fossil fuels that contain sulfur, such as coal and oil is the main cause of acid rain in the world.

The main cause of acid rain in the world is the burning of fossil fuels that contain sulfur, such as coal and oil. When these fuels are burned, they release sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere, which can react with water, oxygen, and other chemicals to form sulfuric acid (H2SO4) and nitric acid (HNO3). These acids can then fall to the ground as acid rain, causing environmental damage and health problems. Therefore, reducing the use of these fuels or using technologies to reduce their emissions can help to prevent acid rain.

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b. The entropy of the system must increase in any spontaneous process. c. A reaction that is spontaneous in one direction will be nonspontaneous in the reverse direction under the same conditions. e. For any spontaneous process, K will increase as temperature (T) increases.

a. The statement is true. Entropy change for an isothermal process depends on both the absolute temperature and the amount of heat reversibly transferred.
b. The statement is true. The second law of thermodynamics states that the entropy of the system must increase in any spontaneous process.
c. The statement is true. A reaction that is spontaneous in one direction may not be spontaneous in the reverse direction under the same conditions. The direction of a reaction depends on the Gibbs free energy change (ΔG) and if ΔG is negative, the reaction is spontaneous in that direction.
d. The statement is false. The rate of a process is not related to its spontaneity. Spontaneous processes can be slow or fast.
e. The statement is true. For any spontaneous process, K (equilibrium constant) will increase as temperature (T) increases.

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The correct statement regarding the relationship between water balance and sodium balance is that increased sodium concentrations in the ECF will increase the movement of water from the ICF to the ECF.

This is because water follows sodium due to osmosis. If there is an increase in sodium levels, water will move from the area of low concentration (ICF) to the area of high concentration (ECF) to try to balance the concentration of sodium ions. On the other hand, if there is a decrease in sodium levels, natriuretic peptide release occurs, which decreases water loss in urine. As a result, sodium and water balance are closely linked and can affect each other. In conclusion, maintaining an appropriate balance of sodium and water is critical for the body to function correctly, and an imbalance can lead to health problems.

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NO2 exists as O=N+-O, as a nucleophilic leaving group it should be in form of O=N-O¯. Hence, (a) is correct

What is nucleophilic aromatic substitution?

It is a reaction in in which a nucleophile displaces a leaving group on an aromatic ring.

The presence of EWG increases the rate of nucleophilic aromatic substitution

Nucleophilic aromatic substitution does not follow SN2 reaction mechanism, as the substitution takes place at trigonal carbon atom having sp3 hybridization.

It does not proceeds by SN2 reaction mechanism because of the steric hindrance of the benzene ring.

In the presence of a superior leaving group, the SN1 reaction pathway may be followed by nucleophilic aromatic substitution.

The SN1 reaction would result in the production of an aryl carbocation and the removal of the leaving group.

In most cases, elimination addition or addition elimination route is followed by nucleophilic aromatic substitution.

NO2 exists in the form of O=N+-O, as a nucleophilic leaving group it should be in form of O=N-O¯.

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The pKa value of formic acid is approximately 3.75. pKa is a measure of the acidity or basicity of a compound and represents the negative logarithm of the acid dissociation constant (Ka).

Formic acid, also known as methanoic acid, is a weak acid commonly found in nature. It is produced by various organisms, including ants, hence the name "formic" derived from the Latin word for ant, formica.

The pKa value of formic acid indicates that it is a moderately strong acid. In aqueous solutions, formic acid partially dissociates into hydrogen ions (H⁺) and formate ions (HCOO⁻). This pKa value is important in determining the acid strength and reactivity of formic acid in various chemical reactions and its behavior in different environments.

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Answer:

all u need to do is this 27 + 30 = 57.

Explanation:

Answer:

Partial pressure of H₂ = 0.9556 atm

Explanation:

Given:

Barometric pressure = 753 torr

Vapor pressure of water = 26.74 torr

FInd:

Partial pressure of H₂

Computation:

Partial pressure of H₂ = Barometric pressure - Vapor pressure of water

Partial pressure of H₂ = 733 - 26.74  

Partial pressure of H₂ = 726.26 torr

1 atm = 760 torr

So,

Partial pressure of H₂ = 726.26/760

Partial pressure of H₂ = 0.9556 atm

The correct electronic configuration or orbital diagram for titanium is [Ar] 3d² 4s²; the correct option is D.

The element titanium is a transition metal that has the atomic number 22.

The atomic number of 22 means that there are 22 electrons in the electron shell of titanium.

The electronic configuration of titanium is [Ar] 3d² 4s²

Titanium is used for several purposes such as

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The concentration of iron (III) ions in the solution is 0.0705 M.

To determine the concentration of iron (III) ions in the solution, we need to use the stoichiometry of the reaction between sodium sulfide (Na2S) and iron (III) nitrate (Fe(NO3)3) and the volumes and concentrations of the reactants.

The balanced equation for the reaction is:

2 Na2S + 3 Fe(NO3)3 → 6 NaNO3 + Fe2S3

From the equation:

2 moles of sodium sulfide react with 3 moles of iron (III) nitrate to form 1 mole of iron (III) sulfide.

2 moles Na2S + 3 moles Fe(NO3)3 = 1 mole Fe2S3

First, let's calculate the number of moles of sodium sulfide and iron (III) nitrate used in the reaction:

Moles of sodium sulfide = volume (in L) × concentration

                       = 0.022 L × 0.34 mol/L

                       = 0.00748 mol

Moles of iron (III) nitrate = volume (in L) × concentration

                         = 0.053 L × 0.22 mol/L

                         = 0.01166 mol

From the stoichiometry of the reaction, we can see that the mole ratio of sodium sulfide to iron (III) nitrate is 2:3. Therefore, the limiting reagent is sodium sulfide because there are fewer moles of sodium sulfide compared to iron (III) nitrate.

Since 2 moles of sodium sulfide react with 1 mole of iron (III) sulfide, we can calculate the moles of iron (III) sulfide formed:

Moles of iron (III) sulfide = (0.00748 mol Na2S) × (1 mol Fe2S3 / 2 mol Na2S)

                          = 0.00374 mol

Finally, we can determine the concentration of iron (III) ions (Fe3+) in the solution. Since 1 mole of iron (III) sulfide corresponds to 3 moles of Fe3+ ions, the concentration is:

Concentration of Fe3+ = moles of Fe3+ / volume (in L)

                     = (0.00374 mol) / (0.053 L)

                     = 0.0705 M

Therefore, the concentration of iron (III) ions in the solution is 0.0705 M.

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The correct formula of the molecule is C4H9O2.

The model of a compound is a representation of the molecule. It gives us an idea of what the molecule looks like as well as its molecular formula.

Looking at the structure of the compound as shown in the model in the question, the correct formula of the molecule is C4H9O2.

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Answer:C4H9O2.

Explanation:

B

Explanation:

I aint sure tho i am sorry

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, the correct option is option A.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. The ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the given compound is 1:3 as cation is always smaller in size than anion.

Therefore, the correct option is option A.

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The neutral form predominates at pH 6. The positively charged form predominates at pH 1, and the negatively charged form predominates at pH 13.

The positively charged form of glycine at neutral pH (7.0) has a protonated amino group and a neutral carboxyl group. The neutral form of glycine has a protonated amino group and a deprotonated carboxyl group. The negatively charged form of glycine has a deprotonated amino group and a deprotonated carboxyl group.

At pH 11, which is basic, the glycine molecule will be deprotonated and exist predominantly in its negatively charged form, with a deprotonated amino group and a deprotonated carboxyl group.

At pH 1, which is acidic, the glycine molecule will be protonated and exist predominantly in its positively charged form, with a protonated amino group and a neutral carboxyl group.

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Answer:

100° C (212° F).

Explanation:

The location of resources a concern, because some areas have more access to resources than others, Human populations are sometimes concentrated in areas that are lacking resources, and areas with fewer resources may need to buy resources from other areas. Therefore, option D is correct.

Natural resources are substances obtained from the planet that are utilised to sustain life and provide for human needs. A natural resource is something that comes from nature that humans use.

Natural resources include things like stone, sand, metals, oil, coal, and natural gas. Air, sunshine, soil, and water are examples of other natural resources.

Resources are more easily accessible in some places than others. There are periods when human populations are concentrated in places with few resources. Localities with limited resources could be forced to import resources.

Thus, option D is correct.

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The materials comes as It is deposited with sediment grains. (a)

The material used to make cement is composed of minerals found in sedimentary rocks. These sedimentary rocks are formed when sediment grains are deposited in layers and then hardened over time.

These sedimentary rocks can include sand, clay, and minerals such as calcite and gypsum. The sediment grains are the source of the material used to make cement.

The mixture is heated until it forms a paste-like material called clinker. The clinker is then ground into a fine powder, which is the cement we use for construction and other purposes.

So, cement is made from a mixture of these sediment grains, combined with water and other substances such as limestone, iron ore, and aluminum oxide. (a)

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Answer:

see explanation below

Explanation:

Yes

Mg(NO3)2 + Na3PO4 => Mg3(PO4)2 + 3NaNO3

Magnesium phosphate, Mg3(PO4)2, is a white product that is insoluble in water. Sodium nitrate, NaNO3, is soluble in water making it clear solution.

During the research, the scientists collect the details and observations based on the information called data. Thus, option A is accurate.

A data is set of facts and observations including textual information, graphs, images, etc. It includes all the measurements and observations collected during the research work. The hypothesis is a thesis statement or a theory.

Observation in research is the gained information and facts during the research process that involves the recording of the data using some sort of tools. While variable is the set that can vary or change.

Therefore, the correct option is A. data.

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The molecular formula if the molar mass is 92 g/mol if the empirical formula is nitrogen dioxide then the molecular formula is N₂O₄.

An empirical formula is a simple expression of the relative numbers of atoms of each element present in a compound. It is typically written as a chemical formula in the form of a whole number ratio, such as CH2O for glucose, denoting that there are two atoms of hydrogen for every one atom of carbon and one atom of oxygen. Empirical formulas are not the same as true chemical formulas, which also list the arrangement of atoms in a compound.

Molecular formula = (empirical formula) × \(\frac{molar mass}{empirical formula mass}\)

Empirical formula for nitrogen dioxide is NO₂

Empirical formula mass = 2×(16)+32 = 64

Molecular Formula = NO₂ x (\(\frac{92}{64}\)) = NO₂ x 1.4375 = \(N_1_._4_3_7_5O_2_._8_7_5\)

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Answer:

2457.6

Explanation:

I calculated the answer and got it right.

Answer:

15.1 mL of the HCl solution should be added

Explanation:

First off, let's use the definition of pH to find the desired number of H⁺ moles:

pH = -log[H⁺]

2.80 = -log[H⁺]

= [H⁺]

[H⁺] = 1.58 x 10⁻³ M

Then we use the definition of Molarity [C=n/V]:

[H⁺] = 1.58 x 10⁻³ M = molesH⁺ / 1.00 L

molesH⁺ =  1.58 x 10⁻³

So in the end there needs to be 1.58 x10⁻³ moles of H⁺ to achieve the desired pH.

Now let's calculate the added amounts of HCl and NaOH

mL HCl = 100 - 84 = 16 mL = 0.016 L

mL NaOH = 100 - 88 = 12 mL = 0.012 L

mol HCl = 0.016 L * 7.00x10⁻² M = 1.12x10⁻³ mol HCl = mol H⁺

mol HCl = 0.012 L * 5.00x10⁻² M = 6.0x10⁻⁴ mol NaOH = mol OH⁻

OH⁻ reacts with H⁺, producing water. So the moles of H⁺ remaining in the solution are:

1.12x10⁻³ - 6.0x10⁻⁴ = 5.2x10⁻⁴ mol H⁺

This means that the moles of H⁺ that we need to add are:

1.58x10⁻³ - 5.2x10⁻⁴ = 1.06x10⁻³ mol H⁺

Finally we calculate the required volume of HCl:

C = n/V

7.00 x10⁻² M = 1.06x10⁻³ mol H⁺ / V

V = 0.0151 L = 15.1 mL

Answer:

Light and Sound can be considered as non-matter.

Explanation:

Various forms of Energy like Heat, Sound, Light can be considered as non-matter

Answer:

Everything that has mass and takes up space is matter. Every day, you find something usual that either does't have mass or else don't take up space. Those things are non-matter. Basically, any type of energy or any abstract concept is an example of something that does not have matter.

Explanation:

A combustion reaction is a reaction that reacts with oxygen to produce the product. 3.5 moles of methane release - 3115 kJ/mol of heat.  

A combustion reaction is a chemical reaction that involves the burning of the reactant in the presence of the oxygen molecule to release heat.

The balanced reaction of methane combustion is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

From the reaction, it can be said that 1 mole of methane combusts to produce -890kJ/mol enthalpy.

So, 3.5 moles will produce, 3.5 × -890kJ/mol = - 3115 kJ/mol.

Therefore, 3.5 moles of methane produce - 3115 kJ/mol heat.

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Answer:

359

i think

Explanation:

Answer:

\(\frac{15}{7}N\)

Explanation:

We already know that the mass number of an atom is the sum of the number of protons and the number of neutrons.

So, the mass number of this isotope is;

Number of protons = 7

Number of neutrons = 8

Mass number = 7 + 8 = 15

Hence, the isotope is;

\(\frac{15}{7}N\)