How many spaces have been left for the possible discovery of new elements?

Answer:

4H₂O₂ + PbS = PbSO₄ + 4H₂O

Answer:

C it generally decrease

Explanation:

Atomic radius of an element decrease from left to right of the periodic table

The process is isobaric as a result of the separator breaking down. The amount of benzene in the liquid leaving the separator increases, This is also known as isobaric process.

A thermodynamic process known as an isobaric process occurs at a fixed pressure. Greek words "iso" and "baros," which both signify equal pressure, were used to create the phrase "isobaric." Therefore, when the volume is increased or decreased, the constant pressure is obtained.

With the molecular formula C6H6, benzoene is an organic chemical substance. Six carbon atoms linked together in a planar ring, with one hydrogen atom connected to each, make up the benzene molecule. Benzene is a hydrocarbon since it is made up only of carbon and hydrogen atoms.

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The specific heat of the object can be obtained as 1.3 J/Kg/°C.

We know that energy can neither be created nor destroyed. The meaning of this is that, when the object looses heat, the heat must be transferred to the water since the heat energy can not be lost.

Thus;

Heat lost by the object = Heat gained by water.

Let us denote the heat lost using a negative sign.

Then;

H = mcdT

H = heat lost/ gained

m = mass of the object

dT = temperature change

Then;

-(59 * c * (27.5 - 98)) = 150 * 4.18 * (27.5 - 19))

4159.5c = 5329.5

c = 5329.5/4159.5

c = 1.3 J/Kg/°C

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On balancing the reaction of formation of ammonia we know that for every one mole of Nitrogen gas, we need three moles of Hydrogen gas to produce, two mole of the ammonia.

We are given with volume of Hydrogen gas i.e. 2.9 ml and are asked to determine the volume of ammonia

Since the volume of hydrogen is given as 2.9 ml = 2.9/1000 l

Mole of hydrogen =2.9/(22.4)(1000)

Mole of hydrogen = 0.129/1000 moles of H₂

Get the number of moles of NH₃

Number of moles of  NH₃ = 2/3 of moles of Hydrogen

Number of moles of  NH₃ = 2/3 * 0.129/1000 moles of H₂

Number of moles of  NH₃ =0.0863/1000 moles of  NH₃

Get the volume of ammonia  NH₃

Volume of ammonia produced = 0.0863 * 22.4

Volume of ammonia produced = 1.933 ml

Hence the volume of ammonia that would be produced by this reaction if 2.9 ml of hydrogen were consumed is 1.933 ml

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True, Combined gas law does relates volume and temperature.

The combined gas law is effectively a restructuring of the ideal gas law, where both n (mols of gas) and R (already a constant) remain constant. It can be used to determine how changes in pressure, volume, or temperature can be used to calculate the conditions of the resulting system.

The combined gas law is a combination of the three previously known laws which are- Boyle’s law PV = K, Charles law V/T = K, and Gay-Lussac’s law P/T = K. Therefore, the formula of combined gas law is PV/T = K,

Where P = pressure, T = temperature, V = volume, K is constant.

One can adjust the formula for the combined gas law so as to compare two sets of conditions in one substance. In the equation, the figures for temperature (T), pressure (P), and volume (V) with subscripts of one are representative of the initial condition. Also, those with the subscripts of two are representative of the final condition.

So we can conclude that the combined gas law relates volume and temperature.

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The percent by mass of the water in the hydrate is 83.6 percent.

Calculate the percent by the mass of each detail by using dividing the mass of that element by 1 mole of the compound by using the molar mass of the compound and multiplying by using one hundred%. consider your end result. the chances upload as much as a hundred%.

This system allows for displaying the bottom complete number of moles and the relative range of atoms of every detail in a compound. With the help of the empirical formulation, chemists can also calculate the actual molecular system. This component suggests the exact range of atoms within the compound.

Calculation:-

mass of hydrated sample = 12.2 gram

actual mass = 10.2

percentage mass = 10.2/12.2 × 100

                             =  83.6 percent.

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1.6 ml volume of 6.00 m acetic acid is needed to 200 ml of 0.05 m acetic acid

WE know that

V1 * M1 = V2 * M2

V2 = 200 ml = 0.2 l

M1 = 6.00 m

M2 = 0.05 m

V1 * 6m = 0.2 l * 0.05 m

V1 = (0.2 * 0.05) / 6

V1 = 0.0016 L

V1 = 1.6 ml

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The element could be X is phosporus .

What is element?

An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the  mathematics, an element is the  distinct piece of a larger system or set.

Sol-An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the elememts expands the octet, do it must be in the 3rd period or higher.

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The answers that are true in regards to the scenario above is:

So, the first and second options are correct. The third and last option is incorrect.

A community is described as a social unit with commonality such as place, norms, religion, values, customs, or identity.

From the scenario above, we can conclude the following:

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The calculations possible using only 28.02 g/mol as a conversion factor are:

One of many ways to do a conversion in chemistry is by using the conversion factor. It is an arithmetical multiplier for converting a quantity of a unit to the equivalent expressed in another.

Given the conversion factor of 28.02 g/mol (molar mass of nitrogen), we could calculate the grams of  N2 in 5.03 x 10^20 moles of nitrogen gas. We also can calculate the moles of N2 molecules in 3.94 grams of nitrogen gas by using 28.02 g/mol as the conversion factor.

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When energy depleted elements associated with a proton are accepted by an organic molecule the process is called Fermentation.

Fermentation is a metabolic process that causes a chemical change inside body by the actions of enzymes.

The main purpose of fermentation is to generate NAD+ and 32 ATP in the presence of oxygen.

Fermentation allows cells to survive without using ATP.

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Extrapolation method for determining the titration end point is more accurate than finding the minimum conductivity because there is no human error when calculating as there could be with doing the actual experiment

Extrapolation is the estimating an unknown value based on extending a known sequence of values and to extrapolate is the infer something not explicitly stated from existing information and the point at which the indicator changes color is called as endpoint and so the addition of an indicator to the analyte solution help us to visually spot the equivalence point in an acid base titration and the endpoint refer to the point at which the indicator changes color in and acid base titration

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The three major flaws addressed by Moran's periodic spiral are:

1) Since hydrogen possesses distinct attributes that set it apart from every other element in the table, it effectively does not belong to any of the table's 18 columns.

2) The lanthanides and actinides, which are the elements from each period of the f block, have comparable properties but are not shown in columns in the table.

3) The column-and-row layout of the  periodic table hides the continuity between the pieces, which is better represented by an a spiral.

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The time taken to deposits one mole of silver if a current of 6 ampere is passed through the silver trioxonitrate solution is 16083 seconds or 283 minutes.

Electrolysis is the process of converting electrical energy into chemical energy.  If current is passed between two electrodes which are immerse in an electrolyte solution, the metal which is reduced will deposited at the cathode.

The weight of the deposited metal w related with its equivalent weight z, current I and time t is :

w = zIt /96500.

One mole of silver is 108 g. Its equivalent weight also be 108 g Thus the time t is calculated as follows:

108 g = 108 × 6 × t /96500

      t = 96500/6

        = 160835 seconds or 268 minutes.

Hence, the time taken to deposits one mole of silver in this electrolysis is 268 minutes.

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No, a process that is internally reversible and adiabatic is not necessarily isentropic. A process is isentropic if there is no change in entropy during the process. However, a process can be internally reversible and adiabatic and still have a change in entropy.

Entropy is a measure of the disorder of a system, and a reversible process can still have a change in entropy if the system is not in equilibrium.A reversible process is one that can be reversed without any change in entropy. However, if the system is not in equilibrium, the process can still have a change in entropy. This is because the entropy of a system is a measure of the disorder of the system, and a system that is not in equilibrium is not in a state of maximum disorder.

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A physical change does indeed involve a change in composition. Hence,t the given statement is true.

A physical change is one in which the form of the matter is altered but this does not mean it transforms into another. By composition, we refer to the size and the shape of the matter which is altered after a physical change occurs.

A physical change is reversible. This means that even though the shape and size of the matter change completely, it can always be reverted back to how it was by applying all the conditions that were present there before.

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The molecules of isopropyl alcohol do not stick collectively as strongly at room temperature as water molecules do, because of this the alcohol evaporates more quickly than water does.

DNA isn't soluble in ethanol, consequently, it will clump collectively and come to be visible. The colder the ethanol, the less soluble the DNA can be in it, which is why it's far critical for the ethanol to be kept bloodless.

Isopropyl Alcohol may also shape an ignitable vapor/air combination in closed tanks or boxes. Isopropyl Alcohol can react with AIR and OXYGEN over the years to shape unstable peroxides which can explode. Isopropyl Alcohol forms explosive combos, whilst heated, with ALUMINUM.

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In periodic table group 5A consist of nitrogen, phosphorus, arsenic and the group 7A consist of all the halogens.

The periodic table is a table form of chemical elements arranged according to atomic number, starting with hydrogen and ends to oganesson, which has the highest atomic number.

Because they are arranged in table form  of the elements, it is known as the periodic table. They're present in rows and columns. Periods and Groups are the names given to the horizontal rows that comes from left to right and the vertical columns that comes from top to bottom.

Thus, Group 5A contain nitrogen, phosphorus , arsenic compounds while in group 7A contain all the halogens.

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Answer:

Let us know formula and denotion for Lithium oxide is Li2O.

Explanation:

While on the basis of Electronic configuration:

Lewis structure(for Lithium atom)-Li•

For Oxygen atom- it is 6 dots in the Word O(for Oxygen) but is needed to paired in a pair(of two dots if possible) by the use of either all sides where two dots are presented two sides While one dot is represented on other two sides.

When we come across we might have a simple question how and why the Lithium oxide is Li2O

So,as we know Li(have one electron in its outermost shell),written as Li^+/+1 While Oxygen requires 2 more electrons to stabilize its valency,so it written as O^-2/2-

On combining,Li^+ & O^-2

Exchange and crossing up of valency is done forming Li2O.

Do check the image uploaded for better clarity and understanding.

Answer:

linear

Explanation:

carbon doixide is a nonpolar covalent bond since their polar charges repels each other at 180 degrees that is why its linear.

please rate it,thanks.

0.3147128245 moles of AgNO₃ will be needed to completely react with 10.0 g of Cu.

Determine the number of moles of copper by dividing its mass by its molar mass.

moles Cu = mass Cu / MM Cu

moles Cu = 10.0 g/ 63.55 g/mol

moles Cu = 0.1573564123

Based on the balanced chemical reaction between copper and silver nitrate, 1 mole Cu needs 2 moles AgNO₃ to proceed with the reaction completely.

Cu + 2AgNO₃ ⇒ 2Ag + Cu(NO₃)₂

If there are 0.1573564123 moles Cu, then 0.3147128245 moles AgNO₃ is needed.

moles AgNO₃ = 0.1573564123 moles Cu(2 moles AgNO₃ / 1 mole Cu)

moles AgNO₃ = 0.3147128245

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Answer: nowhere from trees

Explanation:

The mass of nitric oxide produced by the reaction of 2.81 grams of ammonia is 1.59 grams.

The equation for the reaction of ammonia and oxygen to produce Nitric oxide and water is,

4NH₃ + 5O₂ → 4NO + 6H₂O

From the reaction we can see,

4 moles of ammonia = 4 moles of nitrix oxide.

Mole of ammonia = moles of nitric oxide.

Moles = reacted/formed mass/ molar mass

Molar mass of ammonia = 17 g/mol.

Molar mass of nitric oxide = 30 g/mol.

Mass of ammonia reacted = 2.81 grams.

Putting values,

2.81 x 17 = Formed mass of nitric oxide x 30

Formed mass of nitric oxide  = 1.59grams.

The mass of nitric oxide formed is 1.59 grams.

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Based on the densities and percent mass of copper and tin, the density of Bronze is 8.76 g/cm³.

Density is the ratio of the mass and volume of a substance.

For a mixture, the density of the mixture is the weighted average of the densities of the substance in the mixture.

The density of the bronze is calculated as follows;

The density of copper = 8.96 g/cm³

Percent mass of copper = 88%

The density of tin = 7.3 g/cm³

Percent mass of tin = 12%

The density of Bronze = 88% * 8.96 + 12% * 7.3

The density of Bronze = 8.76 g/cm³

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Benzoic acid showed a smaller rf value than 9-fluorenone in the TLC result because of its different attraction phase, stationary phase, and mobile phase.

The Rf esteem depends on the stationary stage and portable stage of the TLC plate. The Rf esteem of a compound changes based on how pulled it is to the stationary and versatile stages.

As a rule, the stationary stage is silica gel, which is very polar, so the versatile stage is moderately non-polar.  

Benzoic corrosive is moderately polar since it incorporates a carboxylic corrosive bunch. So, it would have a moo Rf value on a TLC plate with silica gel as the stationary stage and hexane as the versatile stage.

The Rf esteem on a TLC plate with silica gel as the stationary stage and 60:40 hexane: ethyl acetic acid derivation as the versatile stage.

The benzoic corrosive would be more pulled into the generally polar 60:40 hexane: ethyl acetic acid derivation than the non-polar hexane portable stage.

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5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.

Dilution is the process of “lowering the concentration of a solute in a solution by simply adding more solvent to the solution, such as water.” Diluting a solution enables adding more solvent without adding more solute.

into formula to find out the volume is ;

[tex]V_{1}[/tex][tex]N_{1}[/tex] = [tex]V_{2}N_{2}[/tex]

where [tex]V_{1}[/tex]= ?

[tex]V_{2}[/tex] = 175ml

[tex]N_{1}[/tex] = 6

[tex]N_{2}[/tex] = 0.2

So, ⇒ [tex]V_{1}[/tex]×6 = 175×0.2

[tex]V_{1}[/tex] = 5.83 ml

So, 5.83ml of NaOH is needed to prepare 175 ml of 0.20 m by dilution.

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The total outer atoms present in a molecule with planar shape are four and total lone pairs are 2.

Square planar shape is formed when there are four bonds and two lone pairs on the central atom.

The four atoms that are attached to the central atom are known as the four outer atoms. These atoms are arranged in such a way that it makes the square shape. The outer atoms are not always fours. They can be 2,3 or four.

The lone pairs are present on the central atom.

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Molecular formula of xanthophyll is C₄₀ H₅₆O₂ .

In the question given that

Compund xanthophyll is yellow in color and found in bird feathers and flowers.

It contains carbon , hydrogen and oxygen in ratio 20:28:1 .

Molecular formula : Μultiply each index of the molecular formula by n to get the molecular formula, as denoted by the general empirical formula AxBy: (AxBy)n= AₙₓBₙᵧ

from the given ration of composition of elements in compund we can drive empirical formula of xanthophyll.

empirical formula is C₂₀H₂₈O

Now , time to drive molecular formula for xanthophyll.

Molar mass of xanthophyll = 659g/mol

empirical formula mass = 12×20+1× 28+2× 16 = 300 g/mol

n formula per unit = molar mass of compound / empirical formula mass

=> n = 659/ 300 = 2.1 ~ 2

So , Molecular formula of xanthophyll is (C₂₀H₂₈O)2 = C₄₀H₅₆O₂

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