The kb of hypochlorous acid is 3. 0×10^–8 at 26. 0 C. What is the percent of ionization of hypochlorous?

Answer:

7.44 grams CaCl2 will produce 10.0 grams KCl.

Explanation:

The equation is balanced:

I've repeated it here, with the elements corrected for their initial capital letter.

CaCl2( aq) K2CO3( aq) → 2KCl( aq) CaCO3( aq)

This equation tells us that 1 mole of CaCl2 will produce 2 moles of KCl.

If we want 10.0g of KCl, we need to convert that mass into moles KCl by dividing by the molar mass of KCl, which is 74.55 grams/mole.

 (10.0 grams KCl)/(74.55 grams/mole) = 0.1341 moles of KCl.

We know that we'll need half that amount of moles CaCl2, since the balanced equation says we'll get twice the moles KCl for every one mole CaCl2.

So we'll need (0.1341 moles KCl)*(1 mole CaCl2/2moles KCl) = 0.0671 moles CaCl2.

The molar mass of CaCl2 is 110.98 grams/mole.

(0.0671 moles CaCl2)*(110.98 grams/mole) = 7.44 grams CaCl2

7.44 grams CaCl2 will produce 10.0 grams KCl.

The value of r is 0.0868 and the error percentage is 5.78%.

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Amide is produced when a 2° amine and an acid chloride combine.

Acid chloride: What is it?

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The chlorine molecules, cl2, would behave if mixed with water is best described by the polarity concept.

Polarity is a phenomena by which the dissolving power of any molecule can be known if they are polar will completely dissociate in water and if non polar will partially dissociate in water

Here chlorine is very poorly dissolve in water due to its non polar nature and water is polar. Some compounds are polar for short time of period and attend a partially positive and a partially negative charge within them.

Therefore,  Cl2 is a non polar compound describes the polarity.

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Answer:

Molecule

Explanation:

Yes, because magnets strongly deflect beta radiation, you wouldn't have been affected.

Guidelines for conduct in the science lab

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If both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.

The ovaries are two reproductive organs in women which act to generate germinal female cells known as ovules.

The absence of these organs (ovaries) leads to a stage known as menopause and the individual cannot produce sex hormones such as estrogen and progesterone.

In conclusion, if both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.

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Answer:

  3.0×10⁻¹³ M

Explanation:

The solubility product Ksp is the product of the concentrations of the ions involved. This relation can be used to find the solubility of interest.

The power of each concentration in the equation for Ksp is the coefficient of the species in the balanced equation.

  Ksp = [Al₃⁺³]×[OH⁻]³

The initial concentration [OH⁻] is that in water, 10⁻⁷ M. The reaction equation tells us there are 3 OH ions for each Al₃ ion. If x is the concentration [Al₃⁺³], then the reaction increases the concentration [OH⁻] by 3x.

This means the solubility product equation is ...

  Ksp = x(10⁻⁷ +3x)³

For the given Ksp = 3×10⁻³⁴, we can estimate the value of x will be less than 10⁻⁸. This means the sum will be dominated by the 10⁻⁷ term, and we can figure x from ...

  3.0×10⁻³⁴ = x(10⁻⁷)³

Then x = [Al₃⁺³] will be ...

  [tex][\text{Al}_3^{\,+3}]=\dfrac{3.0\times10^{-34}}{10^{-21}}\approx \boxed{3.0\times10^{-13}\qquad\text{moles per liter}}[/tex]

We note this value is significantly less than 10⁻⁷, so our assumption that it could be neglected in the original Ksp equation is substantiated.

__

Additional comment

The attachment shows the solution of the 4th-degree Ksp equation in x. The only positive real root (on the bottom line) rounds to 3.0×10^-13.

Equilibrium constant for the reaction is

[tex]\sf K_{sp}=[Al^{3+}][OH^-]^3[/tex]

So

[tex]\\ \rm\Rrightarrow s=\dfrac{3.0\times 10^{-34}}{(10^{-7})^3}[/tex[

[tex]\\ \rm\Rrightarrow s=\dfrac{3.0\times 10^{-34}}{10^{-21}}[/tex]

[tex]\\ \rm\Rrightarrow s=3.0\times 10^{-13}M[/tex]

The Chlorine and fluorine atoms are  the most electronegative.

So, option D and E is correct one.

The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.

The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .

Example:

The elctronegativity of fluorine atom = 3.98

The elctronegativity of chlorine atom =3.16

The elctronegativity of carbon atom = 2.25

The elctronegativity of phosphorus atom = 2.19

The elctronegativity of silicon atom = 2.58

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The classification of whipped cream is a foam.

So, option C is correct one.

The whipped cream is a colloid and it consists of gas ( dispersed phase ) in liquid ( dispersed medium) system.

Sol is a solid dispersed in the liquid . Examples includes Au , S sol in water , milk of magnesia .

The emulsion is liquid dispersed into the liquid . Example is milk

Foam is a gas dispersed into the liquid . Examples includes whipped cream  , shaving cream , foam on the beer .

Gel is the liquid dispersed into the solid . Examples includes , butter , jellies .

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The tetrahedral structure that forms the backbone of all silicate minerals is composed of silicon and option(b) i.e, oxygen

The tetrahedron-shaped silica chemical structure. It comprises a core silicon atom that connects with four oxygen atoms on both sides. The tetrahedron-shaped geometric figure that is drawn around this configuration has four sides, each of which is an equilateral triangle.

Silicon and oxygen make up the silica tetrahedron, which serves as the base for all silicate crystals. In all sorts of rocks and everywhere in the world, the mineral quartz, SiO2, is formed. In deposited rocks, it manifests as sand grains, in igneous and metamorphic rocks, as crystals, and in veins that cut through all different types of rocks. These veins occasionally contain gold or other precious metals. It is widely known that up until the late 1700s, it was simply known as rock crystal. Quarts belong to a class of minerals known as silicates, all of which include silicon and oxygen in varying amounts. The majority of the minerals in the crust of the planet are silicates, and most estimates place 97 percent of the mantle and 95 percent of the crust in the crust.

The complete question is:  

The silica tetrahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?

a. magnesium c. iron

b. oxygen d. carbon

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[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]

Let's solve ~

Initial concentration of weak acid HA = 0.200 M

and dissociation constant ([tex]{ \alpha} [/tex]) is :

[tex]\qquad \sf  \dashrightarrow \: \alpha = \frac{dissociation \: \: percentage}{100} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \alpha = \frac{9.4}{100} = 0.094[/tex]

Now, at initial stage :

At equilibrium :

Now, we know :

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{[H+] [A-]}{[HA]}} [/tex]

( big brackets represents concentration )

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.0188×0.0188}{0.1812}} [/tex]

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.00035344}{0.1812}} [/tex]

[tex]\qquad \sf  \dashrightarrow \: { K_a \approx 0.00195 } [/tex]

[tex]\qquad \sf  \dashrightarrow \: {K_a \approx 1.9 × {10}^{-3} } [/tex]

According to the problem, we have a 0.200 M solution of a weak acid HA that is 9.4% ionized. To find the Ka (acid dissociation constant) for HA, we can use the percent ionization formula:

From this formula, we know that [H+] (the concentration of hydrogen ions) is equal to 9.4% of [HA]initial, and [HA]initial is equal to the initial concentration of the weak acid, which is 0.200 M. Solving for [H+], we get:

Now we can use the equation for Ka:

We don't know the concentration of the conjugate base (A-) at this point, but we can assume that it is equal to [H+] because the weak acid is only slightly ionized. Therefore, we can substitute [A-] = [H+] = 0.0188 M into the equation and solve for Ka:

[tex]\sf Ka = \dfrac{(0.0188)^2}{(0.200 - 0.0188)} = \bold{1.8 \times 10^{-3}}[/tex]

So the answer is [tex]\bold{ B.\: 1.8 \times 10^{-3}}[/tex].

I hope this helps!

Two equivalents of NaOH are needed to fully neutralize the solution.

A neutralization reaction involves the reaction of an acid and a base to form salt and water. The reaction is exothermic in nature.

For example,

[tex]HCl (aq) + NaOH(aq)\rightarrow NaCl(aq) + H_2O (l)[/tex]

During the titration of [tex]H_2PO_4^-[/tex] it gives [tex]2H^+[/tex].

[tex]H_2PO_4^- \rightarrow 2H^+ +PO_4^3^-[/tex]

To neutralize these [tex]2H^+[/tex], 2 [tex]OH^-[/tex] is needed which come from 2 equivalents of NaOH

[tex]2NaOH \rightarrow2 Na^+ +2OH^-[/tex]

Therefore, 2 equivalents of NaOH are needed

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The trend will be such that the time taken for the cross to disappear will be increasing.

The rate of reactions is affected by the concentration of reactants. The more concentrated the reactants are, the more the rate of the reaction, and vice versa. This is based on the condition that all other factors are kept constant.

In the illustrated reaction, the volume of sodium thiosulfate decreases downward while the volume of water increases. This means that the sodium thiosulfate gets more diluted as we move downward.

Thus, the reaction rate will keep decreasing. In other words, more time would be needed for the cross to disappear as the concentration of sodium thiosulfate decreases.

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body structure: the shape of specific organs/attributes of an organism. This includes cells, tissues, organs, and systems.

function: the action or purpose an organ or attribute has.

Body structure

Function

What is a body structure of the Spiny Katydid?

Spines on the body

What is the function of this structure?

The spines on the Spiny Katydid's body prevent predators from having an easy time eating them

Further Notes:

Without the spines on their body, Spiny katydids would be more vulnerable to being eaten. The spines help them survive

What is a body structure of the Longhorn Cowfish?

puckered mouth

What is the function of this structure?

The puckered mouth allows the Longhorn Cowfish to blow jets of water.

Further Notes:

The jets of water the Longhorn Cowfish blows move the sand, exposing the organisms it eats. Without the puckered mouth, the Longhorn Cowfish would have difficulty finding food.

What is the body structure of the Tarsier?

Huge eyes

What is the function of this structure?

The Tarsier's huge eyes allow it to see well.

Further Notes:

It's excellent vision helps it see and hunt for prey

body structure

function

"Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

Periods refer to the horizontal lines of the periodic table. Each period represents the sequential occupation of an atom's valence shell orbitals, also with longer periods representing the employment of an atom's d subshell orbitals.

As the atomic number rises, more electrons, as well as protons,  are present, increasing attraction over time, which drives the atomic radius to shrink over time.

Therefore, "Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

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The volume of  0. 250 mole sample of [tex]H_{2}[/tex] gas occupy if it had a pressure of 1. 70 atm and a temperature of 35 °C is  3.71 L.

Calculation,

According to ideal gas equation which is known as ideal gas law,

PV =n RT

By putting all the values of the given data like pressure temperature universal gas constant and number of moles in equation (i) we get ,

1.7 atm×V = 0.25 mole ×0.082 × 208 K

V = 0.25 mole ×0.082atm L /mole K × 308 K /1.7 atm

V = 3.71 L

So, volume of the sample of the hydrogen gas occupy is  3.71 L.

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Answer: The process is diffusion.

Explanation:

a dark liquid will have the highest concentration of dark purple atoms/molecules so it gives a concentrated colour.

when water is added to it, the colourless water molecules fill up the gaps between the purple particles and so their colour fades and becomes lighter and lighter as we add more water. see the image attached where imagine the red particles are water and the blue particles are purple particles. thats why the colour fades.

The pH of the solution is used to estimate the acidic and the alkaline condition. The pH paper can be used to determine the conditions. The compound with pH 13.3 is basic.

The concentration of the hydrogen or the hydroxide ion in the water gives the estimate of the pH. The potential and the amount of hydrogen decide the acidic and the basic compound.

The pH scale ranges from 0-14 where the scale of 0-6 is acidic, 7 is neutral and 8-14 is basic. If the substance shows a pH of 13.3 then it will lie in the basic range.

Therefore, the compound with a pH of 13.3 is basic.

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Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.

To find the answer, we need to know more about the early universe.

Thus, we can conclude that, the correct answer is option b.

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Mass of aluminum = (1.50 m^3)( 2.70 x 10^3 kg/m^3) = 4050 kg 

The intention of density is the assembly per volume of the substance. This is an intrinsic property consequently the size (or any external feature) does not change this effects.

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Answer: D

Explanation: 4.05 x 10^3 kg

When pcl5 solidifies it forms pcl4 cations and pcl6–anions. according to valence bond theory, hybrid orbitals that  are used by phosphorus in the pcl4 cations are one orbital of s and three orbital of p as it is sp³hydridised.

Hybridization is a process or system which specifies the shape and geometry of any element or molecule with bond angles too.

The pcl4 cation is sp³ hybridized because of the phosphorus behave as a central atom here and the 4 chloride molecules are attached with the p- orbitals to the phosphorus molecule.

Therefore, pcl4 cation  is sp³ hybridized.

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The  empirical formula refers to the simplest formula of a compound.

The term empirical formula refers to the simplest formula of a compound. The empirical formula shows us the ratio of the atoms that are involved in the compound. It does not show the actual number of the atoms in the molecule as this is shown by the molecular formula. However, the arrangement of atoms in the compound is shown by the structural formula.

Now, let us write the compounds that can be formed rom each ion;

1) Fe^3+

-FeCl3

-FeBr3

-FeI3

-FeF3

2) C2H3O2^-

-NaC2H3O2

-KC2H3O2

-Ca(C2H3O2)2

-Mg(C2H3O2)2

3)

CN^-

-Fe(CN)3

-CsCN

-NaCN

-KCN

4) Pb^4+

-PbCl4

-PbI4

-PbBr4

-PbF4

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The vapour pressure of the solvent is 28.25 torr.

Raoult's law is a physical chemistry relationship with consequences for thermodynamics. The theory, put out by French chemist François-Marie Raoult in 1887, asserts that the partial pressure of each component of an ideal mixture of liquids is equal to the vapor pressure of the pure component (liquid or solid) multiplied by its mole fraction in the mixture. As a result, the mole fraction of the solute in the solution is equal to the relative decrease in vapor pressure of a diluted solution of a nonvolatile solute.

According to Raoult's law, p = p⁰ × x

Where,

p = partial vapour pressure of the solvent

p⁰ = vapour pressure of the solvent

x = mole fraction of solvent

The mole fraction of the pure solvent = 15 .8 /19.3

                                                               = 0.81

Substitute values in the above expression,

p = p⁰ × x

22.6 = p⁰ × 0.8

p⁰ = 28.25 torr

Therefore, the vapour pressure of the solvent is 28.25 torr.

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There exist ways in separating mixtures of chloride salts such as that sodium chloride and ammonium chloride. It can be accomplished by crystallization, filtration, or sublimation.

An antacid exists as a substance that neutralizes stomach acidity and stands habituated to relieve heartburn, indigestion, or an upset stomach.

Antacids increase the pH of the stomach contents toward neutrality. An antacid that increases the pH from 1.5 to 3.5 produces a 100-fold decrease in the concentration of gastric acid. Furthermore, the reduction of acidity exists escorted by inhibition of pepsin activity, another essential component of the digestive juice.

There exist ways in separating mixtures of chloride salts such as that sodium chloride and ammonium chloride. It can be accomplished by crystallization, filtration, or sublimation. The easiest approach among the three exists separation by sublimation.

Ammonium chloride sublimes upon heating. The sublimation exists as a decomposition of ammonium chloride forming ammonia and hydrogen chloride.

Sodium chloride on the other hand doesn't sublime and includes a more increased melting point than ammonium chloride. If we want to divide the mixture, we have to heat it to 330-350 degrees Celsius and manage the gas that will be produced.

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Answer:

[tex]\frac{1 kJ}{1,000 J}[/tex]  ·  [tex]\frac{1,000 mmol}{1 mol}[/tex]

Explanation:

The final answer has a different set of units. In particular, millimoles (mmol) changes to moles (mol) and joules (J) changes to kilojoules (kJ). To make this change, you need to multiply the first value by proportions.

When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since J is located in the numerator, it must be located in the denominator of the conversion. Furthermore, since mmol is located in the denominator, it must be located in the numerator of the conversion.

Proportions:

1,000 J = 1 kJ

1,000 mmol = 1 mol

The full expression:

As you can see, the old units cancel out and you are left with kJ in the numerator and mol in the denominator.

The concentration of the bromine solution, given the data is 0.04 M

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of bromine molecule (B₂) = 1.6 / 160

Mole of bromine molecule (B₂) = 0.01 mole

Molarity = mole / Volume

Molarity bromine solution = 0.01 / 0.25

Molarity bromine solution = 0.04 M

Thus, molarity of the bromine solution is 0.04 M

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If the concentration of a dilute solution of nitric acid is 0. 0001 M. The pH of the solution is 4.

pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.

To calculate the pH hydrogen ion it is expressed as:

pH = - log [H⁺]

So, concentration of hydrogen ion in HNO₃ is 0.0001 M.

pH = - log [0.0001]

     = [tex]-\log (\frac{1}{10000})[/tex]

     = - log (10)⁻⁴

     = -4 × - log (10)

     = - 4 × (-1)

     = 4

Thus from the above conclusion we can say that The pH of the solution is 4.

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The mole fraction of ethylene glycol is 0.203.

The mole fraction represents the number of moles of a specific component divided by the total number of moles present in the given solution.

It is a method of expressing the concentration of a solution

Mole fraction can be represented by x. Let a solution consists of components A and B then, the mole fraction is

[tex]Mole fraction of solute, n_A = \frac{n_A}{n_A+n_B}[/tex]

[tex]Mole fraction of solvent, n_B = \frac{n_A}{n_A+n_B}[/tex]

The molar mass of ethylene glycol = 62 g

Given the mass of ethylene glycol = 2.109 x 10³ g

The molar mass of water = 18 g

Given the mass of water= 2.40×10³ g

No moles of ethylene glycol,  [tex]n_A[/tex] = [tex]\frac{2.109 \times 10^3 g}{62 g}[/tex]

                                                =34.02

No of moles of water, [tex]n_B[/tex] = [tex]\frac{2.40 \times 10^3 g}{18 g}[/tex] = 133.33

Mole fraction of ethylene glycol = [tex]x = \frac{n_A}{n_A +n_B}[/tex]  = [tex]\frac{34.02}{34.02+133.33} = \frac{34.02}{167.35}[/tex]

                                                      =  0.203

Hence, The mole fraction of ethylene glycol is 0.203

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