oxygen forms a number of compounds with sulfur, many of which are quite reactive. one such compound is 57.20 % by mass s . calculate the number of grams of oxygen present in a sample of this compound that contains 56.00 grams of s .

No. of moles present in 0.502 mol of calcium nitrate

Calcium ions = 0.502 mol,

nitrate ions= 1.004 mol,

oxygen atoms =3.012 mol.

The chemical composition Ca(NO3)2(H2O)x is calcium nitrate, an inorganic substance. Rarely occurring anhydrous chemical converts to tetrahydrate by absorbing moisture from the atmosphere. Colorless salts can exist in both anhydrous and hydrated forms.

Although there are additional uses for calcium nitrate, it is most frequently employed as a component in fertilizers. When manure hits concrete or limestone in a dry environment, such as a stable or cavern, nitrocalcite, a mineral that is hydrated calcium nitrate, forms as an efflorescence.

The related compounds calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate are just two examples.

Calcium nitrate Ca(NO3)2 = 0.502 mol

Required equation of the given question is below:

Ca(NO3)2 —-> 2N03-  + Ca2+

Which contains 2 nitrate ions per mole of Ca(NO3)2.,

1 calcium ion per mole of Ca(NO3)2.,

6 oxygen atoms per mole of Ca(NO3)2.

Calcium ions therefore = 0.502 mol,

nitrate ions = 2 x 0.502 mol = 1.004 mol

oxygen atoms = 6 x 0.502 mol = 3.012 mol

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Answer:

Your friend got a life or its a happy moment for you

Explanation:

Sub atomic particles are those particles which have the size smaller that the size of an atom. these are neutrons, electron and protons.

Mass number = neutrons + protons so in lithium 3+4=7

The number of protons present in an element is known as atomic number. This is denoted as Z. Different atom have different atomic number because they have different number of protons.

The sum of protons and neutrons give us the mass number. This is denoted as A. The weight of the of the electron can be neglected so atomic mass is almost equal to mass number.

In case of lithium its nucleus consist of 3 protons  and 4 neutrons so mass number = neutrons + protons ,3+4=7.

⁷₃Li this is the symbolic representation where above number is mass number and below number is the atomic number.

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Due to electron shielding, which occurs when more electrons are introduced at the same energy level as the outermost electron, this is the case.

It is feasible to anticipate an atom’s reactivity, including which ion(s) will form from that element, thanks to the protons, neutrons, and electrons that give an atom its unique features.

Since they are found in the atom’s nucleus, protons and neutrons are referred to as nucleons jointly.

The mass number of the chemical element will be determined in part by the number of protons and neutrons. The quantity of electrons present will depend on the number of protons.

The chemical will be determined by this electron.

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The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.

A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.

In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.

In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

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Answer:

8.99 g

Explanation:

The statement that best describes a scatterplot is as follows: it shows quantitative data that relate two variables (option C).

A scatter plot is a graphical representation of data that showcases the relationship between two different variables.

A scatter plot is usually plotted or displayed on a cartesian plane made up of two axes. The X-axis runs form left to right and usually shows the range of values of an independent variable.

The y-axis runs from top to bottom and usually shows the range of values of variable dependent on one other variable.

Therefore, it can be said that a scatter plot can best be described as one that shows quantitative data that relate two variables.

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A chemical symbol is a notation of one or two letters representing a chemical element.

From the data in the question, we obtain the following;

The term Ka is the acid dissociation constant. It shows the extent to which an acid is dissociated in solution. We know that the acids that dissociate completely in solution are called strong acids.

In this case;

[tex]HCHO_{2}[/tex](aq)  ⇔ [tex]CHO_{2} ^-[/tex](aq)  + [tex]H^+[/tex](aq)

Hence;

[[tex]HCHO_{2}[/tex]] = 0.2 M

[[tex]CHO_{2} ^-[/tex]] = 0.006 M

[ [tex]H^+[/tex]] = 0.006 M

Ka = [ [tex]H^+[/tex]]  * [[tex]CHO_{2} ^-[/tex]]/[[tex]HCHO_{2}[/tex]]

Ka = (0.006)^2/(0.2)

Ka = 1.8 * 10^-4

The pH of the solution = -log(0.006) = 2.22

If more [tex]CHO_{2} ^-[/tex] were added to the solution, the equilibrium position would shift to the left hand side.

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Many everyday substances, such as oxygen, gold and aluminium, are element . but Other substances such as water and sugar are not

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The number of dilutions required to reach 2.5% as the final concentration would be 2.

Any dilution in which the concentration is reduced by the same amount in each subsequent stage is referred to as a serial dilution.

In serial dilutions, the original volume divided by the final amount is known as the dilution factor.

[tex]DF = \frac{V_i}{V_f}[/tex]

Now we are given that we must do 50% serial dilution, which indicates that the concentration must be reduced to half of its starting value after each dilution.

∴ [tex]DF=\frac{10}{50}[/tex] × [tex]100[/tex]

DF = 2

This indicates that starting with a 10% concentration, a single dilution would result in a 5% concentration. And again diluting this 5% concentration would result in a 2.5% concentration.

Hence, the number of dilutions required to reach 2.5% as the final concentration would be 2.

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Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.

mass is the amount of matter present in a particle.

unit of mass is kg.

weight is the force acting on the particle due to the gravity of the earth.

unit of weight is N.

let 1 kg block has mass x

then 2 kg block will have 2x mass

we can say that it has twice mass.

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice mass

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Answer:

dogs, lions, cats, and raccoons.

Answer: Yes it can help make cake rise.

Explanation: Its a leavening agent and its a good ingredient for baking.

Answer: 1 gravitational pull

2not all of the sun would hit the earth so half of the earth would live in darkness

Explanation:

The histidine residue would be protonated in a solution with pH 4.0.

pKa value illustrates the pH value at which the protonated and deprotonated forms of the weak acid are in a 1:1 ratio. This means that at pH values below pKa (more acidic, because pH is a negative logarithm of the H+ ion concentration), the dominant form of the histidine residue is the protonated one. On the other hand, at pH values higher than 6.0 (more basic), the deprotonated form is the dominant one.
Because 6 - 4 = 2, this means that the concentration of the protonated form is 100 times higher than the concentration of the deprotonated one.

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Answer:

Acid base acid base

Explanation:

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.

Mass is the amount of matter present in the particle.

it is expressed in kg.

weight is the force acting on the particle due to the gravity of the earth.

It is expressed in newton N.

let in 1 kg block the mass present is x.

so in a 2 kg block, the mass will be 2x.

we can say that mass becomes twice.

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The concept molarity is an important method which is used to calculate the concentration of a solution. Here molarity - volume relation is used to find out the concentration of the sodium hydroxide solution.

The term molarity is defined as the number of moles of the solute present per lite of the solution. It is represented as 'M' and it is expressed in the unit mol / L.

The equation connecting molarity and volume is:

M₁V₁ = M₂V₂

M₂ = M₁V₁ / V₂

0.1 × 25 / 20 = 0.125 cm³

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Answer:

Explanation:

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An atom is mainly constructed of a total of three different particles known as electrons, protons and neutrons.

An atom is neutrally charged because the charge/number of the electrons (negative charge) is equal to the charge/number that the proton carries (positive charge). these charges cancel out each other making the atom neutrally charged.

An ionized atom is called as the one which has some net charge present on it. This charge on it can be either a positive charge or a negative charge.

A radioactive atom is an atom that is an unstable atom and has access of energy in its center. This radio activeness can be caused by adding either neutrons or protons.

To Model a radioactive atom, increase the number neutron or proton present in the nucleus.

Hence, through this we can conclude that to model an ionized atom is done by adding or removing electron(s) from the atom while to model a radioactive atom we add additional Neutron or proton to the nucleus.

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A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.

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When the solution are mixed together, the gas that evolved must be Carbon dioxide.

There are two reactions:

When nickel sulphate reacts with sodium sulphate which gives nickel carbonate with sodium sulphate.

1) NiSO₄ (aq) + Na₂SO₄ (aq) = NiCO₃ (s) + Na₂SO₄

The resultant is a green solid.

When the resulting slurry i.e. the nickel carbonate reacts with hydrochloride, gives nickel chloride, carbon dioxide and water, and also the disappearance of the precipitate.

2) NiCO₃ (s) + 2 HCl (aq) = NiCl₂ + CO₂ + H₂O

When the evolved gas is added to NH₃ solution it dissolves the precipitate and forms a blue solution which gives the confirmation that the gas so evolved is carbon-di-oxide.

The given question was incomplete, complete question is:

"A class is given a demonstration of solution chemistry and solubility equilibria.Passage: A 6.57-g sample of NiSO₄•6H₂O (molar mass 262.84) is dissolved in enough water to make 50.00 mL of a green solution, and 7.15 g of Na₂CO₃•10H₂O (molar mass 286.14) is dissolved in enough water to make 50.00 mL of a colorless solution. The two solutions are mixed, and a green precipitate forms. The resulting slurry is divided into two equal portions. To one portion is added an excess of 6 M HCl, which results in the disappearance of the precipitate and a rapid evolution of a gas. To the second portion is added a few milliliters of 6 M NH₃. The precipitate dissolves, and a blue solution forms.Question: According to the information in the passage, the gas that evolves is:

A) sulfur dioxide. B) sulfur trioxide.

C) carbon dioxide. D) carbon monoxide".

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One limitation to science is that it cannot answer questions about morality.

Science is defined as the systematic study of a structure through careful experiment and observations.

However, there are limitations that are encountered in the field of science which include the questions that science cannot answer.

Some of the limitations of science include the following:

Science cannot answer the question of morality because it doesn't have a link of how man makes his judgement through his consciousness and how ethics, scope of cultural, religious and social influences affects his decisions.

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What is Gravimetric analysis?

Gravimetric analysis difficulties are basically stoichiometry problems with a few extra stages. It is a class of lab techniques to determine the concentration of a solution by measuring the mass of a precipitate formed. To find moles of solute use grams of precipitate and to find concentration divide by volume.

                  Moles = mass / molar mass

                   mass moles × molar mass

                      (mass analyte/ mass sample)  × 100

Solution:

Given:

Mass of AgCl= 5.48 g

1) Molar mass of AgCl = 143.42  g/mol

Number of moles of AgCl = 5.48 g AgCl/143.32 AgCl = 0.0382 mol AgCl

Number of moles of MgCl₂ = 0.0382 mol AgCl × (1 mol Cl/1 mol AgCl )× (1          mol MgCl₂/2 mol Cl ) = 0.0191 mol MgCl₂

2) Mass of MgCl₂ = 0.0191 mol MgCl₂ × (95.20 g MgCl₂ / 1 mol MgCl₂)  

                             =1.82 g MgCl₂

 Percent by mass = ( 1.82 g MgCl₂/ 2.94 g sample)  × 100% = 61.9%       MgCl₂ by mass

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Based on Thomson's plum pudding model of the atom, what did Rutherford expect All the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom.

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