what is manforce ????​

The concentration in mmol/L of the chemist's mercury(I) chloride solution. is 2.03 × 10^-8 M

We are given;

Number of moles of mercury (i) chloride as 0.000406 μmol

Volume is 200 mL

We are required to calculate the concentration of the solution.

We need to know that;

Concentration is also known as molarity is given by;

Molarity = Number of moles ÷ Volume

Number of moles = 4.06 × 10^-10 Moles

Volume = 0.02 L

Therefore;

Concentration = 4.06 × 10^-10 Moles ÷ 0.02L

                      = 2.03 × 10^-8 M

Thus, the molarity of the solution is 2.03× 10^-8 M.

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The statement " Inertia and distance combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth " is false.

According to Sir Isaac Newton, he proposed and concluded in his investigation that the earth is being kept in its orbit around the Sun and the Moon in orbit around Earth by means of gravity and inertia. This is not done through inertia and distance.

In conclusion, it can be deduced from the explanation given above that inertia and gravity combine to keep the earth in orbit around the Sun and the Moon in orbit around Earth.

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Answer:

.......element 3 ............

Spontaneous reaction is a reaction that occurs without the addition of energy

There are two types of reactions in thermodynamics:

Endothermic reactions -

Exothermic reactions -

Thus we can conclude that spontaneous reaction is a reaction that occurs without the addition of energy

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The empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively. Thus, the figures illustrate the law of multiple proportions.

The law of multiple proportions states that when two elements form more than one compound, the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.

Now, let's see if the figures quoted in the problem obey this law:

The first oxide:

C = 42.9

O = 100-42.9

   = 57.1

The equivalent mole of each atom would be:

C = 42.9/12

  = 3.56

O = 57.1/16

   = 3.56

Thus, the empirical formula of the first oxide is CO.

The second oxide:

C = 27.3

O = 100 - 27.3

   = 72.7

The equivalent mole of each atom will be:

C = 27.3/12

  = 2.27

O = 72.7/16

   = 4.54

Dividing the moles by the smallest mole

C = 2.27/2.27

  = 1

O = 4.54/2.27

   = 2

Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].

In other words, the figures quoted obeys the law of multiple proportions.

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The set of reactions that best represents the diagram of a precipitation reaction is given below:

Li₂SO₄ (aq) + AgNO₃ (aq)  ---->

The net ionic equation is given below:

SO₄²⁺ (aq) + 2 Ag⁺ (aq)  ----> Ag₂SO₄ (s) (a precipitate)

Precipitation reactions are reactions in which two soluble solutions when they are mixed result in the formation of an insoluble precipitate.

Precipitation reactions rea usually double replacement reactions.

Double replacement reactions also known as double displacement reactions are reactions in which an exchange of radicals occurs between two metallic cations resulting in the formation of an insoluble compound that forms the precipitate observed.

Considering the given reactions and the products obtained:

NH₄Br (aq) + Pb(C₂H₃O₂)₂ (aq) ---> forms no precipitate

KNO₃  (aq) + CuCl₂(aq) ---->  forms no precipitate

Li₂SO₄ (aq) + 2 AgNO₃ (aq)  ---->  2 LiNO₃ (aq) + Ag₂SO₄ (s) (forms a precipitate)

NaClO₄ (aq) + CaCl₂ (aq)  ---->  forms no precipitate

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Answer:

These forces differ from covalent and ionic chemical bonding because they result from fluctuations in charge density of particles. Examples of van der Waals forces include hydrogen bonding, dispersion forces, and dipole-dipole interactions.

Explanation:

When chromium changes from an oxidation state of +3 to that of +6, the Cr3+ must: lose 3 electrons.

So option C is correct.

The oxidation state or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic which describes the degree of oxidation of an atom in a chemical compound. In any concept, the oxidation state may be positive, negative or zero.

When chromium changes from an oxidation state of +3 to + 6 it loses 3 electrons during the process. For example oxidation state of elemental atoms such as sodium, magnesium, iron is zero.

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The molality of 6.2g of LiBr in 52.6g water is 0.0013mol/kg

The molecular weight of LiBr is 86.845 g/mol thus substituting this value in the formula of moles,

Moles of LiBr = grams/molecular weight

Moles of LiBr = 6.20/ 86.845

Moles of LiBr = 0.071 mol

Substituting the value of moles in the formula of molality

Molality= moles/grams of solvent

Molality= 0.071/52.6

Molality= 0.0013 mol/g

Molality, or more specifically, the number of moles of solute contained in a kilogram of solvent, is a unit used to express the concentration of a solution.

The quantity of moles of solute per kilogram of solvent is known as molality, which is denoted by a tiny "m."

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Answer:

24.984466667

Explanation:

add all mass values and divide by amount (3)

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give 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 compound that will be formed from group 13 elements and group 17 is AlCl₃.

Therefore, the correct option is option A.

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A close-up photograph must be taken by the prosecutor to demonstrate the position of the body in relation to the rest of the crime scene.

For criminal investigation analysis, it becomes important to capture photographs from those areas in which acts of violence took place. To record the crime scene in more detail the photograph must be taken from close range and also with perfection. Close range photographs enables the viewer to understand where and how the crime was committed. The photographs of entry and exit of the crime scene is taken so carefully to observe the movement of the criminal before and after of the crime.

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Answer:  C

Explanation:

Answer:

Zn^2+

Explanation:

The mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.

Volume = 45.0 L

Temperature =  = (87.0 + 273) K = 360 K

Pressure = 950 mm Hg (1 mm Hg = 0.00131579 atm) = 1.25 atm

The formula used to calculate moles is as follows.

∴PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into the above formula as follows:

 ∴ PV = nRT

=> 1.25 atm × 45.0 L = n × 0.0821 L atm/mol K × 360K

=> n = 1.25 atm × 45.0 L / n × 0.0821 L atm/mol K × 360K

=> n = 56.25 / 29.556 mol

=> n = 1.90 mol

Moles is the mass of a substance divided by its molar mass. So, the mass of Cl₂ (molar mass = 70.906 g/mol) is calculated as follows:

∴  Moles = mass / molar mass

=> 1.90 mol = mass /  70.906 g/mol

=> mass = 134.7214 g

Thus, we can conclude that the mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.

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Answer:

Don't follow this!

Explanation:

Your chemistry teacher knows that you are cheating and using this as your own work.

-From said teacher!

The volume that was started with if the temperature of 126 K in a container with a pressure of 31 atm is 3.47L.

The volume of a gas can be calculated using the combined gas law equation as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, an unknown volume of gas held at a temperature of 126K in a container with a pressure of 31 atm.

If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, the initial volume is calculated as follows:

31 × V₁/126 = 19 × 9.4/209

0.246V = 178.6/209

0.246V = 0.854

V = 3.47L

Therefore, 3.47L is the volume of the gas that started.

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The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.

The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.

Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.

Sodium is 11th element. The main shell electronic configuration is  K=2, L=8, M=1. Subshell electronic configuration is  1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.

Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.

Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.

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In the Lac operon, multiple proteins form from the same mRNA due to RNA splicing.

An operon is a cluster of genes that are transcribed from the same promoter to give a  single messenger RNA (mRNA) molecule that contains multiple coding sequences that are used to make multiple proteins.

Such an mRNA molecule is called a polycistronic mRNA.

An example of an operon is the Lac operon which encodes the genes used to produce the various enzymes required for the metabolism of lactose.

Three of the enzymes in the lac operon are grouped together and are known as lacZ, lacY, and lacA.

Alternative splicing of the mRNA produces the different proteins in operons.

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Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

In the displacement reaction , one atom is displaced by the the another atom according to their reactive strength . the highly reactive atom displace the low reactive atom called as displacement reaction.

The reactions are given as :

FeSO₄  +  Zn  ---->  ZnSO₄   +   Fe

Fe(NO₃)₂   +  Zn ----->   Zn(NO₃)₂   +  Fe

Here the zinc is more reactive than the iron . so, Zinc displace the iron in both the cases. Zinc displace the iron in both the cases. The reaction is called as displacement reaction.

Thus, Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

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Answer:

the protons go in the direction of C, the electrons go in the direction of A and neutrons go the direction of B.

Explanation:

this is because electrons get attracted to positively charged objects and protons get attracted to negatively charged objects and neutrons have no attraction towards any charge.

From the general gas equation, the volume of the same sample of gas at STP will be closest to the volume at 350 K and 1 atm multiplied by 273/350; option D.

The relationship between the volume, temperature, and pressure of a gas is given by the general gas equation below:

P₁V₁ / T₁ = P₂V₂ / T₂

Where;

P₁ = initial pressure

V₁ = initial volume

T₁ = initial temperature

P₂ = final pressure

V₂ = final volume

T₂ = final temperature

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 350 * 1 * 273/350

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The mass percentage of HCl 11,900x/118 g and molality of solution is   9.915 mol L^-1.

Molarity = 11.8 M

Molarity = (moles of HCl) / (litres of solution)

Molality = (moles of HCl) / (kilograms of solvent)

=> Let number of moles of HCl present be x moles.

So, 11.8 = x/litres of solution

litres of solution = x/11.8 litres.

So, volume in mL = x/11.8 * 1000 mL =>10,000x/118 mL

Density of solution = 1.19 g/ml

So, D = m/v

Mass of solution = D * v => 1.19 * 10,000x/118 => 11,900x/118 g

=> (11,900x/118)/1000 L => 11.9x/118 litres

Moles of HCl = x moles.

Molality = x/( 11.9x/118)

=> 118x/11.9x => 118/11.9 => 9.9156 mol L-1

=> Molality of solution = 9.915 mol L-1 (approx.)

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The chemical substances that are made up of two or more elements are known as compounds.

Compounds are the chemical substances that are made up of two or more elements which bonded to each other with fixed ratio. When elements combine with each other some of there individual properties are lost and some new properties are observed in the newly formed compounds.

Compounds can be differentiated into two types:

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Mole measure the number of elementary entities of a given substance that are present in a given sample. One mole of iron (ii) sulphate were reacted during the experiment.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation is

FeSO[tex]_4[/tex](aq) + 2 NaOH (aq) [tex]\rightarrow[/tex] Fe (OH)[tex]_2[/tex] + Na [tex]_2[/tex] SO [tex]_4[/tex]

Stoichiometry, thet is written in the front of molecule or compound represents the number of moles of that compound. One mole of iron (ii) sulphate were reacted during the experiment.

Therefore, One mole of iron (ii) sulphate were reacted during the experiment.

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Considering the definition of mass percent, the mass percent of a solution of 65g of KCl in 46.6g of water is 58.24%.

The mass percent is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.

The mass percent is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

mass percent= (mass of solute÷ mass of solution)× 100%

In this case, you know:

Replacing in the definition of mass percent:

mass percent= (65 g÷ 111.6 g)× 100%

Solving:

mass percent= 58.24%

Finally, the mass percent is 58.24%.

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Answer:

0.0833 M NaOH

Explanation:

To calculate the molarity, you need to

(1) convert grams NaOH to moles (using the molar mass)

(2) convert mL to liters

(3) calculate the molarity

It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value with the smallest amount of sig figs (0.499 = 3 sig figs).

 0.499 g NaOH              1 mole
--------------------------  x  ------------------  =  0.0125 moles NaOH
                                       40.00 g

 150.00 mL H₂O                  1 L
---------------------------  x  ------------------  =  0.15000 L H₂O
                                        1,000 mL

Molarity = moles / volume

Molarity = 0.0125 moles NaOH / 0.15000 L H₂O

Molarity = 0.0833 M

Having disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains impacts the environment by reducing water pollution.

What is water pollution?

Pouring chemicals down the drain poses the most immediate risk of water pollution. Chemicals are harmful for consumption by all living things when they are dumped down the drain because of the effects they have on our rivers, lakes, streams, and other water supplies.

In regions where contamination is happening, human health might suffer, which can cause serious health problems. Animals and plants that are given contaminated water get sick and die, which has an impact on agriculture as well.

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16 grams of HCl are in 1 L of 6 M HCl

Number of moles of a substance is actually the ratio of the given mass in the chemical reaction to the mass of one mole of substance. One mole of any substance equals Avogadro's number. It is also used to express concentration units such as mole per liter or molecular weight

Formula for molarity of solute is given as:

Molarity =   moles of solute                

                  Volume of solution in liter

moles of solute = Volume of solution × Molarity

moles of solute = 1L × 6M ⇒ 6moles

Mass of HCl = Number of moles × Molecular weights

                     = 6 × 36.5 ⇒ 16 grams

Therefore the 16 grams of HCl are in 1 L of 6 M HCl

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In a case whereby A bath bomb is a solid sphere made of a weak base and a weak acid and you add it to a bathtub, it mixes with the water to create a soapy solution. If you want it to completely and quickly dissolve a large bath bomb, then  C. Increase the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly.

Solubility can be described as the maximum amount of a substance  which candissolve when subjected to given amount of solvent at a specified temperature.

It should be noted that the Solubility i serves as the characteristic property  that can be associated to a specific solute–solvent combination and there is a differing solubilities, hence from the case aboive when the tempertaure is been increased , this will  increases the solubility of the bath bomb .

Therefore, option C is correct.

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To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is

CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

The skeletal equation is

CH[tex]_4[/tex]+S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+H[tex]_2[/tex]S

The number of carbon atoms on reactant and product side is 1, so C is balanced.

The number of hydrogen atoms on reactant side is 4 while on product side it is 2, so to balance we need to multiply H[tex]_2[/tex]S by 2.

CH[tex]_4[/tex]+S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S

The number of sulfur atoms on reactant side is 1 while on product side it is 4, so to balance we need to multiply S by 4.

CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S

Therefore, the balanced equation is

CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S

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1.6987 grams the silver nitrate crystals is weighed, 100 mL of water is measured, and the weighed silver nitrate is dissolved in the measured amount of water.

We are to prepare a 0.1 M silver nitrate solution given the following:

First, we need to make some calculations to make the amount of silver nitrate and water that will be used.

0.1 M means 0.1 mol silver nitrate crystal in 1 L of water. However, we only have a 100 mL volumetric flask. We need to know the mol amount that will be equivalent to 100 mL of water.

0.1 mol = 1000 mL

100 mL = 100 x 0.1/1000

            = 0.01 mol

Mole = mass/molar mass

Molar mass of silver nitrate = 169.87 g/mol

0.01 mol silver nitrate = 0.01 x 169.87

                                    = 1.6987 grams

Thus, 1.6987 grams of silver nitrate would be weighed.

The following steps would be taken to prepare the solution:

What you will have is 100 mL of 0.1 M silver nitrate solution.

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