calculate the molarity of a solution prepared by dissolving 12.0 g of na2cro4 in enough water to produce a solution with a volume of 680. ml .

Cobalt will form strongest metallic bond among lithium, magnesium, silver, copper and iron.

The bond with the highest attraction between the particles is the strongest bond. The main factors that can influence the potency of the metal to metal attraction. First, the bond becomes stronger the more valence electrons a metal has. The additional electrons will strengthen the overall forces that attract the positive ions. The quantity of unpaired electrons affects how strong a metallic connection is. The bond strength increases with the amount of unpaired electrons. Cobalt exhibits greater bonding as a result of having the most unpaired electrons.

Hence, cobalt form strongest metallic due maximum unpaired electrons

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore the correct option is option D.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose 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.

In CaCl[tex]_2[/tex](aq), CaCl[tex]_2[/tex] molecules, H[tex]_2[/tex]O molecules, Ca²⁺ ions and Cl⁻ ions will be present.

Therefore the correct option is option D.

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An ionic connection is created by lithium and oxygen. Each lithium atom contains one valence electron since it belongs to group 1A. This is lithium's Lewis valence electron structure.

Valence electrons are the electrons located in the atom's outermost shell, or energy level. One such example is oxygen, which has six valence electrons, two of which are located in the 2s subshell whereas four of which are located in the 2p subshell. An expression for oxygen's valence electron configuration is 2s22p4.

The electrons that make up an atom's shell are known as valence electrons. Due to the fact that when two atoms engage, their outermost electrons make contact with one another first but are the ones that control how an atom will respond in a chemical reaction.

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A strong acid is one that entirely ionizes in aqueous solution. When dissolved in water, it always loses a proton (H+). Acid that only partially ionizes in a solution is considered weak acid.

Only a small number of its (H+) atoms are released when it dissolves in water and it also can be explained by Conductivity .

An electrolyte solution's conductivity is a gauge of how well it conducts electricity. In the SI, conductivity is measured in Siemens per meter.

Conductivity is a helpful indicator of water quality in general. Every body of water has a typical conductivity range that, once determined, can be used as a reference point for comparison with routine conductivity tests.

While electrical conductance is a characteristic of a specific electrical component, electrical conductivity is a quality of the substance itself (such as silver) (like a particular wire). The amount of voltage needed to for a given amount of electric current to flow is known as electrical conductivity.

An acid that partially separates into its ions in water or an aqueous solution is referred to as a weak acid. On the other hand, in water, a strong acid completely dissociates into its ions. While the conjugate acid of a weak base is also a weak acid, the conjugate base of a weak acid is also a weak base.

The ability of acidic and basic solutions to conduct electricity is referred to as strong and weak. Strong electrical conductivity indicates that an acid or base is a strong acid or base. A weak acid or base is one that conducts electricity only slightly.

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The theoretical yield of the product was found to be 0.215g.

define theoretical yield ?

The theoretical yield of a chemical reaction is the amount of product received from the full conversion of the limiting reactant. It is the quantity of product produced by a perfect (theoretical) chemical reaction, which is not the same as the amount produced by a laboratory reaction. Theoretical yield is often stated in grammes or moles.

Unlike theoretical yield, real yield is the amount of product generated by a reaction. Actual yield is often lower since few chemical reactions operate with 100% efficiency due to loss retrieving the product and other processes that diminish the product. Sometimes the actual yield exceeds the theoretical yield.

Perhaps as a result of a subsequent reaction that produces more product, or because the recovered product contains contaminants.

The ratio of actual yield to theoretical yield is commonly expressed as a percentage yield.

The theoretical yield of the product was found to be 0.215g.

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Common ionic compounds containing ions  always soluble in water is Alkali metals (Group 1).
Alkali metals are the six chemical elements in a group called Group 1(a) which are in the far left column of the periodic table.  The following are the six alkali metal elements, their properties and uses.
The Elements and Groups of Alkali Metals
The six elements that are included in the alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).  If you look at the periodic table, there is one more element at the top, namely hydrogen (H).  However, hydrogen does not belong to the alkali metals as it is a gaseous element.  All the elements in this group have one electron in their valence shell, or a single valence electron.
The most common alkali metal is sodium.  The amount is 2.8 percent.  The easiest type of sodium to find is sodium chloride or what we know as salt (NaCl).  Then the second most easily found element is potassium with an amount of 2.6 percent throughout the earth.  On the other hand, the rarest are rubidium, lithium and cesium.  Each only amounted to 0.01 percent, 0.002 percent and 0.0007 percent.  Meanwhile, francium is radioactive and only exists in nature for a short time.

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Gauche interactions are only possible between two substituents when their dihedral angle is equal to or less than 600.

Your provided image is somewhat not sufficient to hold two items in a bin, hence I am gonna use another image of the same question with white background to make sure you read it precisely!

Please also note that 'Y' on C-1 can have gauche interactions with substituents on C-2 & C-6 only, remaining all will just either axial or equatorial only!

Cyclohexene is a hydrocarbon with the chemical formula C6H10. This cycloalkene is a colorless liquid with a pointy scent. It's miles an intermediate in various industrial procedures. Cyclohexene isn't always very solid upon long-time garage with exposure to light and air because it forms peroxides.

Cyclohexane is an alicyclic hydrocarbon comprising a ring of six carbon atoms; the cyclic shape of hexane is used as a raw cloth within the manufacture of nylon.

Cyclohexene is used in a numerous variety of chemical syntheses. It's miles a building block that is utilized in Pharma, (eg, Clidanac, MK 346, Trandolapril, and Agchems which includes Propargite.

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12.0 grams od n2 & 15.0 gram of ar are present in a gas mixture with a pressure head of 1.32 atm. 0.704 atm is the pressure drop of n2.

Another of the fundamental observable characteristics of the this phase of matter, pressure (P) is understood to be the force of all gas particulate interactions divided by the size of the wall.

Pressure has a major impact on every aspect of our life, from of the weather to flying. It is particularly crucial during chemical reactions. Chemists can compel chemical reactions to happen and hasten the transitions among solids, fluids, or gases by adjusting pressure.

N=12.0, Ar=15.0

Total pressure=1.32

Partial pressure= n2

WN₂=12.0

WAr =15.0

nN₂=12/28 =0.42

nAr=15/40 =0.37

Xn₂=0.42/0.42+0.37 =0.53

Pn=Xn2×Ptotal

=0.53×1.32=0.69atm that ie nearly equal to 0.7atm.

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If 1-bromoadamantane was solvolyzed in 30% ethanol as opposed to 40% ethanol, the process would be slower.

A renewable fuel called ethanol is produced form corn or other plant components. The United States uses ethanol extensively, and far more than 98% of fuel contains some ethanol. E10, which contains 10% ethanol and 90% gasoline, is the most popular ethanol blend.

Over 2 billion people use ethanol (also known as ethyl alcohol) day after day. Yeast, sugars, mixed starches are fermented to create this kind of alcohol. People have been using ethanol-based beverages like beer and wine for generations to alter their mood.

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The major organic product will be 3, 4 di-methyl pentane.

Chemical processes involving organic molecules are known as organic reactions. The fundamental kinds of organic chemistry reactions include redox reactions, oxidative degradation, pericyclic reactions, elimination processes, as well as substitution reactions.

In the given reaction the starting material is a 5 carbon chain where carbon 2 has a hydroxy substituent and carbon 3 has two methyl substituents. The alcohol is heated to 170 degrees C in 85 percent H3PO4 to form the product. The final product will be 3, 4 di-methyl pentane.

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The silicon chip has [tex]1.22 * 10^{20}[/tex] silicon atoms.

The silicon chip used in an integrated circuit of a microcomputer weighs 5.68mg.

When weight is converted into grams, it gives [tex]5.68 * 10^{-3}[/tex]

To find the number of silicon atoms required, the weight must be divided with atomic weight as shown

[tex]5.68 * 10^{-3} / 28[/tex]

The obtained value must be multiplied with [tex]N_{A}[/tex] value which is [tex]6.023 * 10^{23}[/tex]

This gives  as the numbers of silicon atoms present in the chip [tex]1.22 * 10^{20}[/tex]

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3) Cement particles together: Water does not physically or chemically bind particles together.

Instead of binding particles together, it weakens the cohesion between them, making them more likely to move under the influence of gravity in processes such as landslides, mudflows, and creep.

When water enters the pore spaces between particles, it can increase the pore pressure and reduce the friction between particles, making them less stable.

This can cause soil particles to become saturated and start to move, resulting in the mass movement. Additionally, water adds weight to the mass of the material, making it more susceptible to mass movement.

Hence, the correct choice is to Cement particles together.

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By using the Ka values for given weak acids, the best component to prepare the buffer solution for pH 1.9 is H₃PO₄, pH 5.0 is CH₃COOH and for pH 3.9 is HCOOH.

Buffer solution is the solution which is prepared by the mixture of a weak acid and its strong base or vice versa. Its pH is calculated using Henderson-Hasselbalch formula which is

pH=pKa+log([base]/[acid])

Buffer solutions are working well within the range of pKa±1. Find out pKa value using the formula

pKa=-logka

For H₃PO₄

pKa=-log(7.5×10⁻³)

pKa=2.12

For CH₃COOH

pKa=(1.8×10⁻⁵)

pKa=4.74

For HCOOH

pKa=-log(1.8×10⁻⁴)

pKa=3.74

If we check the range of each solution, then for phosphoric acid(H₃PO₄) it will be in between 1.12-3.12. For acetic acid(CH₃COOH), it is in between 3.74-5.74 and for formic acid(HCOOH), it is in between 2.74-4.74.

Therefore, the best component to preapre the buffer solution for pH 1.9 is H₃PO₄, pH 5.0 is CH₃COOH and for pH 3.9 is HCOOH.

Your question is incomplete but the complete question would be that

Use the Ka values for weak acids to identify the best components for preparing buffer solutions with the given pH values. name formula ka phosphoric acid H3PO₄ CH3COOH 7.5 x 10⁻³ 1.8 x 10⁻⁵ acetic acid formic acid HCOOH 1.8 x 10⁻⁴ pH=1.9, pH=5.0, pH=3.9

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Evaporation is a type of vaporization of a liquid that occurs from the surface of liquid into gaseous phase that is not saturated with the evaporating substance.

On the surface of a liquid as it transitions into the gas phase, evaporation is a type of vaporisation that takes place. When the rate of evaporation of water is affected by humidity, for example, a high concentration of the evaporating substance in the surrounding gas significantly slows down evaporation.

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The anhydrous cpd could significantly decompose into a gaseous product or significantly react w/something in the air.

Water of hydration is water that is stoichiometrically bound into a crystal. While the water is found within a crystal, it is not directly bonded to a metal cation. Crystal salts containing water of hydration are called hydrates.

Many crystals form from particles dissolved in water or aqueous solutions. It's common for some of that water to be incorporated into the framework of a crystal. Usually, heating a crystal drives off water of hydration, but the structure of the crystal is lost.

Commercial root killers often contain copper sulfate pentahydrate (CuSO4·5H2O) crystals. The five water molecules are called water of hydration.

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Answer:

A Red Giant

Explanation:

When the inward gravitational forces are less than the outward radiation pressure forces, the star swells and cools, thus turning red. High mass stars become red supergiants, low mass stars become red giants. The forces become unbalanced when the hydrogen begins to run out.

Brainliest Please?

The citrate synthase-catalyzed phase must have significant favorable free power change so that it can contribute to the production of  high energy molecule, ATP, in order for citric acid cycle to function effectively.

A molecule is an object comprised of at least two atoms that are linked together chemically; the precise number of atomic nuclei that make up a molecule is known. One hydrogen atom gets joined to one halogen atom to form the molecule HCl(g), for instance. It is referred to as a diatomic molecule and has only two atoms.

This term was meant to cover its original definition, which was "the smallest quantity of a component that nevertheless keeps the properties of that substance." "An atom is a body that can't cut in two; a dime is the smallest conceivable component of a specific substance," wrote James Maxwell in 1873 when defining atom and molecule.

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Hydrocarbons are molecules consisting of both hydrogen and carbon reacts with oxygen in a combustion Reaction.

A combustion reaction occurs when oxygen gas (O2) reacts with certain types of compounds. We often call the other compound fuel. A more familiar term for combustion reactions is burning. The most common products of combustion reactions are carbon dioxide and water. Combustion is a high-temperature exothermic (heat releasing) redox (oxygen adding) chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. When a fuel is burned, oxygen in the combustion air chemically combines with the hydrogen and carbon in the fuel to form water and carbon dioxide, releasing heat in the process. Hydrocarbons reacts with oxygen as it has both hydrogen and carbon.

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The intermolecular force is always stronger at the surface of a liquid than in the middle of the liquid because of the cohesive force present in the liquid molecule.

Surface tension of a liquid is the energy required to increase the surface area of a liquid by a unit of area. This surface tension in a liquid results from an imbalanced intermolecular forces, which is known as cohesive forces. The cohesive force is defined as the action of property of molecules, which sticks to one another due to the mutual attraction.

In the middle of the liquid, a molecule in the bulk liquid experience cohesive force. It experiences cohesive force with other molecules in the all directions. At the surface of a liquid, a liquid experiences net inward cohesive forces.

On the surface of a liquid, one molecule is not surrounded by other molecule. In the middle of a liquid, unbalanced attraction pull the molecules in a backward direction.

Therefore, the intermolecular force is always stronger at the surface of a liquid than in the middle of the liquid due to the cohesive force.

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30 ml volume of water have to add to 15. 0 ml of 12 m hcl to make it to 6. 0 m solution.

How do you calculate the volume of a solution needed?

Given data

So first we set up the dilution equation: M1*V1=M2*V2

M: Molarity

V: Volume

We can set these equal in a dilution equation because Molarity is Miles per Volume, and by multiplying it by Volume we get Moles on each side. Moles of solute remain equal throughout a dilution since you are just adding water.

Next, we plug in our knowns:

(12.00M HCl)(15.00ml)=(6.00M HCl)(V2)

V2 = 15 X 12 / 6 = 30ML

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The option(C) is correct, 55.9 g

What is mass?

The amount of matter in a substance or an object is quantified by its mass. Smaller masses can be measured in grammes, but the kilogramme (kg) is the standard SI unit for mass (g). You would use a balance to determine the mass.

What is gram?

The gramme (formerly gramme; SI unit sign g) is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogramme.

1.33moles=mass of NaF41.99g/molmass of NaF=1.33moles41.99g/molmass of NaF=55.85g.

Therefore, option(C) is correct, 55.9 g.

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The pressure of a pure gas is referred to as the dry gas pressure when gases are being collected over water.

what is dry gas pressure?

It can be challenging to determine the mass of gases because of their low densities. It is usual practise to collect gas over water in order to measure the height of displaced water. To do this, insert a tube into an upside-down bottle whose opening is submerged in a bigger container of water. Dalton's Law must be applied to take water vapor into account when estimating the volume of gas that was collected.

The height of the water displaced in the tube can be used to calculate the overall pressure inside the pneumatic trough device, which is used to collect a gas over water.

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The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Get the vanadium and chrome atomic radius  from the time. Cr, V, Ag, and Au are the substances that have perfect solubility in solids.

The total distance between an atom's nucleus and its electron's outermost orbital is known as the atomic radius or atomic radius . The average or typical distance between a chemical element's nucleus and the edge of its neighboring electron shells is what we refer to as the atomic radius of that element. The ionic radius is the distance an ion's nucleus must travel before its effect on the electron cloud is felt. An atom gains or loses electrons to produce ions. Covalent radii in a molecule are equal to half the distance between the nuclei of two atoms of the same element that are covalently bound to one another. Metallic radii: In a metallic lattice, a metallic radius is equal to one-half the internuclear space between two adjacent metal ions.

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The carbon-to-hydrogen mass ratio possible for another compound composed only of carbon and hydrogen is 2.80; option D.

Hydrocarbons are compounds that are composed of only carbon and hydrogen alone.

Hydrocarbons are usually obtained naturally from petroleum.

The common hydrocarbons are:

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Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Electronegativity is the property of an element to gain shared pair of electron. On going down the group of periodic table, electronegativity decreases. The reason for decreasing electronegativity is the increase in the size of the element. Since bromine is larger in size than fluorine, so bromine is less electronegative than fluorine. Bromine is less electronegative than fluorine.

Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.

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State variables are used to characterize matter in bulk. Volume V, compression p, mass M, particle density, thermal energy Eth, and temperature T are some of these variables.

Matter is everything that occupies space and appears to have mass; in the other words, matter seems to be the "stuff" which the cosmos is made of. The basic constituents of all stuff are called elements. They don't change into other elements through normal chemical processes and have distinct chemical and physical properties.

A substance that has a certain mass and volume over space and is commonly referred to as matter. Pencils, toothbrushes, water, and other items are examples of matters.

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14 gram of nitrogen contains 0.5 mol of nitrogen.

We know that the no of mol= [tex]\frac{given mass}{molar mass}[/tex]  , and nitrogen contains 2 N atom thus molar mass is 28. So no of mol is [tex]\frac{14}{28}[/tex] =0.5.

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From the Lewis structures of the compound, the formal charge is -1 and rests on the nitrogen atom.

We know that the formal charge has to do with the charge that the specie appears to have. We have to look at the structure and consider the number of the electron pairs on each of the elements in the compound and then this would help us to be able to decide the formal charge that would be on each structure.

Hence, upon a careful consideration of the structures we can see that the formal charge that can be found on each of the structures for the hydrogen cyanide is -1 and we are now faced with deciding the atom that should carry this formal charge.

Given that the nitrogen atom is more electronegative than the carbon atom then the negative charge ought to rest on the nitrogen rather than on the carbon atom.

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