A sample solution containing sulfate ions (SO42-) was analyzed and was found to contain 5 mol of sulfate ions (SO42-).
Calculate the equivalent of sulfate ions (SO42-) present in the solution.

Answer:

A

Explanation:

Ionic bonds are bonds that occur due to the handover of electrons to form positive ions and negative ions whose electron configuration is the same as that of the noble gasses.

Chemical bonds are the forces that hold atoms in elements and compounds together. Chemical bonds can occur with several types of bonds.

Based on the electron configuration that occurs in bond formation, chemical bonds are divided into 4 types:

1. Ionic or electrovalent bonds

This bond occurs because of the electrostatic attraction between positive ions and negative ions in a chemical compound

2. Covalent bonds

Covalent bonds occur when the sharing of electron pairs from each of the bonding atoms.

3. Coordinate covalent bond

Coordinate covalent bond is a bond that uses a shared pair of electrons, but the electrons only come from one of the atoms.

4. Metallic bond

This bond is formed due to the attractive force of the metal atomic nucleus with a sea of electrons.

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An element's electronegativity determines whether it is ionic or non-ionic. Fluorine has the most electronegativity while iodine has the lowest, which means that the Cs I ionic bond's power of attraction is at its lowest, allowing for the largest possible distance between their molecules.

The attracting and repellent forces that develop between the molecules of a substance are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces act as a bridge between the individual molecules of a substance. Intermolecular forces are primarily responsible for the physical and chemical properties of matter.

The following are the four main intermolecular forces: Van der Waals dipole-dipole interactions < Van der Waals dispersion forces <Ionic bonds <Hydrogen bonds .

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Answer:

PO4 3-

Explanation:

A polyatomic ion is a group of atoms carrying a charge ( positive or negative ).

A polyatomic ion, also known as a molecular ion, is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero.

Whereas  S2- is not because it is an inorganic ion

The body contains organ systems that interact with each other to carry out all necessary functions for survival and growth are digestive , respiratory , circulatory system.

The body contains organs system that interact with each other to carry out all necessary functions for survival and growth are digestive system , respiratory system and circulatory system. They are involved in breakdown and transport of food and the transport of oxygen throughout the body to cell. where they are used up as energy , growth and repair.

Thus, The body contains organ systems that interact with each other to carry out all necessary functions for survival and growth are digestive , respiratory , circulatory system.

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The mass of the manganese oxide MnO forms during the reaction is equal to 496.58 grams.

A mole of substance can be defined as a standard unit that is used to calculate how many entities such as atoms, molecules, or particular particles are present in a given amount of substance.

The number of elementary units in 1 mole was found to be 6.023 ×10 ²³ which is known as Avogadro’s constant.

The reaction of manganese and oxygen can be represented as:

[tex]2Mn + O_2\longrightarrow 2MnO[/tex]

Given, 7 mol of manganese Mn can form MnO = 7 mol

5 mol O₂ gas can form MnO = 10 mol

From the equation, 2 mol of Mn reacts with oxygen gas = 1 mol

Then, 7 mol of manganese Mn will react with oxygen = 7/2 = 3.5mol

Therefore, if we have 7 mol of manganese and 5 mol of O₂ gas then Mn will be the limiting reagent.

Then 7 mol of manganese (Mn) will form MnO = 7 mol

The mass of seven mol of MnO = 7 × 70.94 = 496.58 g

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Body systems work together to maintain the entire organism then the body response to the running mile is then the breathing may become heavy as well as pulse quicken as heart pump harder

According to the given data body temprature from starting it is 98.6°F (37°C) and the ending data is 99.1°F (38°C) and pulse and heart rate is from starting 80 bpm and ending it is 120 bpm and respiration rate is from starting 18 bpm and the ending it is 28 bpm and sweating in starting is normal and in the ending it is increase and skin temprature in starting is 91°F (33°C) and ending is 92.5°F (35°C) so when the student start to run the heat or temprature in the body is normal but when the student run a mile the temprature as well as pulse and heart rate and respiration rate is also increases

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The statement which does not describe the general function of pentose phosphate is that allows a repair of oxidative damage.

A metabolic mechanism that runs parallel to glycolysis is the pentose phosphate pathway, also known as the phosphogluconate pathway, the hexose monophosphate shunt, and the HMP Shunt.  It produces ribose 5-phosphate, a precursor for the synthesis of nucleotides, pentoses (5-carbon sugars), and NADPH.

 Despite the fact that the pentose phosphate route does entail the oxidation of glucose, it plays a more catabolic than catabolic role. The route is particularly crucial for red blood cells (erythrocytes).

The journey is divided into two main stages. The oxidative phase, when NADPH is produced, is the first. The non-oxidative synthesis of 5-carbon sugars is the second. The generation of reducing equivalents, in the form of NADPH, used in reductive biosynthesis such as   fatty acid synthesis.

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C-C triple bond have different environment. Hence, it will show IR active stretching frequency.

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The IR active stretching would be observed for the bonds that are not symmetrical.

We know that compounds that are polar implies that the molecules do have a dipole moment in the molecule. This means that the bond is not symmetrical owing to the fact that the groups that are attached to the central atom of the bond are not the same.

The IR active compounds are the compounds that are have bonds that are not symmetrical. All we need is to look at the bonds and find out the ones that are not symmetrical and hence would have a net dipole moment.

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There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the angles can be found out by VSEPR theory.

VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.

According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element.

Angle A:120 since lone pair is in conjugation with the ring so sp² hybridized.

Angle B:120, sp² hybridized

Angle C:180, sp hybridized

Angle D:109.5 sp³ hybridized

Angle E:120, sp² hybridized

Therefore, the angles can be found out by VSEPR theory.

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OTEC not currently used because it is in an experimental phase and is very expensive

Ocean thermal energy conversion is the electricity generation system and the OTEC refer to using the temprature differences between the deep parts of the sea and which are cold and the shallow part of the sea and which are cold to run a heat engine and produce useful work and the deeper part of ocean are cooler because the heat of sunlight cannot penetrate very deep into the water and OTEC are not currently used because it is an experimental phase and very expensive and it is currently used in japan

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Answer:

Calcium chloride in its anhydrous form is an economical drying agent and very important for drying processes in laboratories. Those are for example: drying of liquids and neutral gases. It is also a very good drying agent for a wide variety of solvents.

Calcium chloride compound in its anhydrous form is an economical drying agent and very important for drying processes in laboratories.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions.They make up the drying agent used to absorb the moisture.They have a unique chemical structure held together by chemical bonds .Molecular compounds where in atoms are joined by covalent bonds.

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The net ionic equation for chemical reaction when  excess of hydroiodic acid combines with  sodium sulfite is 2 H[tex]^+[/tex]  [tex]_(aq)[/tex] + S[tex]^2-[/tex][tex]_(aq)[/tex][tex]\rightarrow[/tex] H₂S[tex]_(g)[/tex].

Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.

An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.

Strong acids and bases exist as dissociated ions present in the solution and are written in forms of ions in ionic equation.Weak acids and bases do not dissociate completely and hence are written in the form of molecular formula.

For the given reaction, net ionic equation is obtained as,by balancing the reaction between hydroiodic acid and sodium sulfite and then writing its dissociated form,

2 H[tex]^+[/tex][tex]_(aq)[/tex] + 2 I[tex]^-[/tex][tex]_(aq)[/tex] +2 Na [tex]^+_(aq)[/tex] + S[tex]^2- _(aq)\rightarrow[/tex] H₂S[tex]_(g) + 2 Na ^+ _(aq)[/tex] +2 I[tex]^-_(aq)[/tex]

Removing the spectator ions , final net ionic equation is,2 H[tex]^+[/tex]  [tex]_(aq)[/tex] + S[tex]^2-[/tex][tex]_(aq)[/tex][tex]\rightarrow[/tex] H₂S[tex]_(g)[/tex].

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Answer:

There will be 2 asymmetric carbons

Explanation:

2,3,4 trichloropentane 2,4 cetre are chiral but 3

rd

centre is pseudo chiral. It depends on the configuration of 2 & 4 so, the statement is false.

solution

Answer:

There are more than 109 different types of atom – one for each element. Differences between the atoms give the elements their different chemical properties. In 2001, there were 115 known elements. However, those above 109 are highly unstable and have been made in only tiny quantities.

Explanation:

A particular element is composed of only one type of atom. Atoms are further composed of subatomic particles called electrons, protons and neutrons.

The audience that President Reagan appeals to in this part of the speech is  : "the American people" (Option A)

An audience is a group of people who read a certain piece of work. As a writer, you should anticipate your audience's wants or expectations in order to transmit information or argue for a certain position.

Knowing your audience helps you decide what information to include, how to arrange that information, and what type of supporting elements are required for the reader to grasp what you are presenting. It also has an impact on the tone and organization of the document.

The audience for a literary review is often composed of people of the writer's own discipline. However, these discipline colleagues may not be experts in the specific topic or problem addressed in the literature study.

The evidence in the text that indicates that the speaker is addressing the American People are:

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Answer: False

Explanation: Eggs are produced during ovulation once a month when someone has a period.

each element has a different set of electron energy levels

wed

only some gases can only absorb and emit specific wavelengths of electromagnetic radiation

Answer:The cell has just transcribed this mRNA strand from its DNA, and it now translates the mRNA's nucleotide sequence into a chain of amino acids. This chain, called a polypeptide, forms the basic structure of a protein. A cellular component called a ribosome coordinates the translation process.

Explanation:

Answer:

∆H° = is the answer ok I am sure it is

Lewis dot diagram is the diagram which describes the chemical bonding between atoms in a molecule. It also represents the total number of lone pairs present on the atom. The lewis dot diagram for H⁻ ion is shown in the attached image.

Since hydrogen contains one electron in the s orbital and it has electronic configuration 1s¹. When hydrogen forms anion, the electron will goes in s-orbital and the electronic configuration of H⁻ ion is 1s². It means both electrons are paired and it shows as a lone pair in the lewis dot diagram of H⁻ anion.

Therefore, the lewis dot diagram is shown in the image which is attached with the question.

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Taking into account the reaction stoichiometry ,0.0140625 moles of Ba₃(PO₄)₂ can be produced if 275 mL of 0.250 M BaCl₂ is added to 225 mL of 0.125 M Na₃PO₄.

In first place, the balanced reaction is:

3 BaCl₂(aq) + 2 Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6 NaCl(aq)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

In this case, you know:

So, the amount of moles of each reagent can be calculated as:

moles of BaCl₂= Volume of BaCl₂× Molarity of BaCl₂

moles of BaCl₂= 0.275 L× 0.250 M

moles of BaCl₂= 0.06875 moles

moles of Na₃PO₄= Volume of Na₃PO₄× Molarity of Na₃PO₄

moles of Na₃PO₄= 0.225 L× 0.125 M

moles of Na₃PO₄= 0.028125 moles

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 2 moles of Na₃PO₄ reacts with 2 moles of Na₃PO₄, 0.06875 moles of BaCl₂ reacts with how many moles of Na₃PO₄?

amount of moles of Na₃PO₄= (0.06875 moles of BaCl₂× 2 moles of Na₃PO₄)÷ 2 moles of Na₃PO₄

amount of moles of Na₃PO₄= 0.04583 moles

But 0.04583 moles of Na₃PO₄ are not available, 0.028125 moles are available. Since you have less moles than you need to react with 0.06875 moles of BaCl₂, Na₃PO₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of Na₃PO₄ form 1 mole of Ba₃(PO₄)₂, 0.028125 moles of Na₃PO₄ form how many moles of Ba₃(PO₄)₂?

amount of moles of Ba₃(PO₄)₂= (0.028125 moles of Na₃PO₄× 1 mole of Ba₃(PO₄)₂)÷ 2 moles of Na₃PO₄

amount of moles of Ba₃(PO₄)₂= 0.0140625 moles

Then, 0.0140625 moles of Ba₃(PO₄)₂ can be produced.

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Answer:

Square planar

Explanation:

Its 180 degrees so it has to be a square planar.

The structure of the molecule is a square planar geometry.

We know that the shape of a molecule is determined by the number of the electron pairs that we can find in the molecule. In this case, we can see that there are six electron pairs that surround the molecule as shown.

Now, we should know that we have four groups that are around the xenon central atom and then we have two lone pairs and this would then correspond to a square planar geometry of the molecule.

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According to the given statement The average Cr atomic mass unit is 51.9963 amu.

A single atom's atomic mass is only its total mass, and it is usually given in atomic mass units, or amu. A carbon atom with six neutrons, or helping students learn, has an atomic mass of Twelve amu by definition.

The entire weight of one atom in an element is referred to as its atomic mass. The atomic mass is its average atomic mass given in atomic mass units (amu, also known as daltons, D). Atomic weight is another name for the atomic number.

Chromium exists in four isotopes that are naturally occurring: 50Cr (atomic mass: 49.9460 amu), 52Cr (atomic mass: 51.9405 amu), 53Cr (atomic mass: 52.9407 amu), and 54Cr (atomic mass: 2.37% amu).

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The smallest molecule in the group, fluorine, or F2, will have the weakest London dispersion forces and the lowest boiling point.

The strength of the intermolecular forces of attraction that a molecule's components exhibit determines its boiling point. In our situation, you must determine how three nonpolar molecules' boiling temperatures relate to one another. The elements that make up group 17 of the periodic table, or the halogens, exist as diatomic molecules. These molecules won't display strong London dispersion forces because they are nonpolar. As a result, since bromine, Br2, is the largest molecule in the group, you may anticipate that it will display the strongest London dispersion forces have the greatest point of boiling.

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Answer:

154 grams CO₂

Explanation:

To find the mass of CO₂, you need to multiply the mole value by the molar mass of CO₂. The molar mass represents the mass (grams) of CO₂ per every one mole. It is important to arrange the ratio/conversion in a way that allows for the cancellation of units.

Atomic Mass (C): 12.011 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (CO₂): 12.011 g/mol + 2(15.999 g/mol) = 44.009 g/mol

 3.5 moles CO₂            44.009 g
-------------------------  x  --------------------  =  154 grams CO₂
                                        1 mole

The mass of 1.22 mol sodium is = 28.06g.

A mole is the SI unit of the quantity of a substance. One mole of a substance contains 6.022 10 to the 23rd power of that substance. Therefore, 1 mole of copper atoms is 6.022 times 10 to the 23rd power of copper atoms. Also, the number of moles of sodium atoms is 6.022 times 10 to the power of 23 sodium atoms.

calculation:-

molar mass of sodium = 24

moles of sodium = 1.22

mass = moles × molar mass

= 1.22 × 24

= 29.28

Mole symbol Mole is a unit of quantity of a substance in the International System of Units. The amount of matter is a measure of how many basic units of a particular matter are contained in an object or sample. Find the atomic weight of each element in the formula, multiply by the number of atoms of that element in the compound and add to all others. This gives the mass in grams of one mole of the molecule.

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Answer:

cool

Explanation:

Option C. The expected freezing point of a 0.50 m solution is  - 2.8°C.

The freezing point is the temperature at which a liquid becomes stable. As with the melting point, multiplied stress typically raises the freezing factor. The freezing point is lower than the melting point in the case of mixtures and for sure natural compounds such as fat.

Calculation:-

ΔT f = i × K f × m

Cs₂SO₄ ------> 2Li⁺ + SO²⁻

Given,

T f° = 0.0 °C

If = 1.86 °C/m

m = 0.50 m

i = 3

substitution of the values in the equation

0 °C - T f = 3 × 1.86 °C/  × 0.50

0 °C - T f = 2.8 C

0 ° C - 2.8°C = T f

- 2.8°C = T f

Hence, the freezing point is  Cs₂SO₃ solution is - 2.8°C .

The freezing point of water and melting point is zero °C or 32 °F. The temperature may be lower if supercooling takes place or if there are impurities present in the water that may purpose freezing factor despair to occur. below positive conditions, water may also remain a liquid as bloodless as -forty to -42°F

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The balanced redox reaction is

Mg(s) + 2Au⁺ (aq)  → Mg²⁺ (aq) + 2Au(s)

Equalizing the right and left sides by the stoichiometric coefficient balances the response. The redox reactions have been balanced and fixed by simplifying the numbers.

The oxidation half-reaction:

Mg  →  Mg²⁺ + 2e⁻

The reduction half-reaction:

2Au + 2 e⁻ → 2 Au

The overall balanced reaction is:

Mg(s) + 2Au⁺ (aq)  → Mg²⁺ (aq) + 2Au(s)

The redox equation can be balanced using the following stepwise procedure. Split the equation into two half-reactions. Balance the mass and charge half-reactions. Balance the number of electrons transferred in each half-reaction. Add half-reactions together.

There are two ways to balance redox reactions. One uses the change in the oxidation numbers of the oxidizing and reducing agents and the other divides the redox reaction into two half-reactions reduction and oxidation. The first step in balancing a redox reaction is to split the reaction in half.

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