the following four spheres represent a metal atom, a nonmetal atom, a monatomic anion and a monatomic cation, not necessarily in that order.which sphere represents the metal cation?

The molecular mass of the unknown compound is 3.7 g/mol.

The molecular mass of the unknown compound can be calculated using the formula for freezing point depression, which is:
ΔT = Kf * m
Where Kf is the freezing point depression constant (1.86 K/m),

m is the molality of the solution (moles of solute per kilogram of solvent), and

ΔT is the difference between the freezing point of the pure solvent and the freezing point of the solution.

Plugging in the values given, we get:
-2.5 = 1.86 * m

Solving for m, we get,

m = -2.5 / 1.86

= 1.35 m

Therefore, the molecular mass of the unknown compound can be calculated by dividing the mass of the unknown compound (5 grams) by the molality of the solution (1.35 m).

This gives us a molecular mass of 3.7 g/mol.

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The freezing point of the solution is -3.53°C.

The Chemical equation of the HBr is -

              HBr → H⁺ + Br ⁻

Initial -     1         0      0

Final -      1-α     α       α

The total moles = 1 - α + α + α

                          = 1 + α

half factor = i = Total mol / Initial mol

                      = 1 + α / 1

                      = 1 + α

Now, Evolution in freezing point

                         ΔT f = i Kf m

                          kf = 1.86                                                (given)

   m(molality = mass of solute / solvent (Kg))

                        Δ T f  = (1 + α) × 1.86 × (mass/molar mass ) / solvent

   [ α = 90/100 = 0.9 because 90% ionised]

  putting the values in above equation -

                           = (1 + 0.9) × 1.86 × (8.1 × 1000) / 81 × 100(gm)

                              ΔT = 3.53°C

    Then freezing point T f =  T° f - ΔT

                            = 0 - 3.53°C

                           T f = -3.53°C

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Complete Question -

What is the freezing point of a solution containing 8.1 g HBr in 100gm. water assuming the acid to be 90% ionised:

[Kf for water =1.86Kmolarity^−1 ]

Answer:

Sb

Explanation:

Sb (antimony) is an metalloid

The theory of traits of a population change over time explains how people can change with respect to the  strength and intensity of basic trait dimensions.

Trait theory in psychology serves as the thorry that focus on the  idea that people differ  whichg can be attributed to their strength  as well as  intensity of basic trait dimensions.

It shouuld be noted that the criteria that characterize personality traits involves the act of consistency as well as  stability,  along with  individual differences.  Natural selection  give us the underswtandng of how genetic traits of a species undergo change over time.

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Answer:

True

Explanation:

IT IS TRUE WIWJJWOWIWHW

In a chemical reaction at constant temperature, the addition of a catalyst provides an alternative reaction pathway with a different activation energy.

A catalyst is a substance that increases the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy. The activation energy is the minimum energy required for a reaction to occur. By lowering the activation energy, a catalyst facilitates the formation of the transition state and increases the rate at which reactant molecules can convert into products.

A catalyst itself remains unchanged in the reaction, meaning it is neither consumed nor permanently altered. It works by providing an alternative pathway that involves different intermediate steps and lower activation energies. This allows the reaction to proceed more readily and at a faster rate.

The addition of a catalyst does not affect the equilibrium constant (choice b) or the energy released in the chemical reaction (choice c). It also does not directly impact the concentration of products at equilibrium (choice d) or the fraction of molecules with a given kinetic energy (choice e).

In summary, a catalyst increases the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy. It does not affect the equilibrium constant, the energy released in the reaction, the concentration of products at equilibrium, or the fraction of molecules with a given kinetic energy.

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The an acid-base neutralization reaction produced salt and water.

The reaction is said to neutralization reaction when acid and base react and form salt and water.  let us take an example : an acid that is HCl and a base NaOH when react they form NaCl . a salt and water , H₂O.

HCl  +  NaOH ---->   NaCl   +    H₂O

acid       base          salt            water

The neutralization reaction of a strong acid and a strong base will results in pH value 7.  the neutralization reaction is also called as the double displacement reaction.

Thus, The an acid-base neutralization reaction produced salt and water.

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They found that difference occurs in the speed of both sound and charges occur due to the difference in the type of medium.

Sound and charges needs specific medium for faster movement i.e. sound moves faster in solid as compared to liquid and gas whereas charges moves faster and easily in gold due to lower resistance which is followed by copper. Sound can move from solid, liquid and gases whereas charges move only in solid metal in which free electrons are present. The speed of sound and flow of current are affected due to difference in the arrangement of atoms in solid, liquid and gas.

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The factor that describes why H2S is more nucleophilic than H2O is polarizability. This is because sulfur (in H2S) is larger than oxygen (in H2O) and has more electrons in its outer shell, making it more easily distorted by a positive charge and therefore more nucleophilic.

The factor that best describes why H2S is more nucleophilic than H2O is polarizability. H2S has larger sulfur atoms with more diffuse electron clouds, making it more easily distorted and more likely to form a bond with an electrophile compared to the smaller, less polarizable oxygen atom in H2O.

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The flow of charged particles is called electricity. The flow of electrons around a circuit is called electric current.

hope it helps...!!!

Answer:

Explanation:

The net ionic equation is essentially the most simplified version of a reaction with only the reactants that form the precipitate (the solid). Due to this it is extremely important to properly write your ionic equation first. In your total ionic equation, you forgot to balance the compounds with 2- charges.  The coefficients in your equation is due to the 2- charge of sulfate and 2+  charge of Strontium. Additionally, precipitates are solid which means they do not dissociate. SrSO4 will stay together while KBR which are both spectator ions will dissociate leaving you with the ionic equation below.

Total Ionic Equation: Sr^2 (aq)+  + 2Br ^1- (aq) +2K ^ 1(aq) +  SO4 ^2- (aq) --> SrSO4 (s) + 2K^1+ (aq) + 2Br^1- (aq)

The coefficient of 2 on both K and Br in the products is to ensure that the equation is balanced and that for your net ionic equation, all spectator ions cancel. When you cancel all of the ions that dissociate you are left with the essence of the reaction:

Net Ionic Equation:  Sr^2 (aq) + SO4 ^2- (aq) --> SrSO4 (s)

Answer:

0.00757 grams

Explanation:

Find the molar mass of the compound: which is 60.05.

The molar mass is basically just the sum of all the atomic masses of each of the elements.

Then multiply the molar mass by the number of moles in the compound, which is 1.26 x 10^-4 moles.

Your answer should be 0.00757 grams.

The main purpose of following the course of a reaction by TLC is to determine if all the starting material is converted to the product. Thin-layer chromatography (TLC) is a simple chromatographic method that helps to separate and purify the compounds from a mixture.

It is used for the qualitative analysis of organic compounds by following the course of a reaction by TLC.TLC is a quick and easy method for checking if the starting material has been completely converted to the product. The product and starting material can be separated by TLC if the product has different properties from the starting material. The result of the TLC analysis can be used to determine if the reaction is complete by comparing the Rf values of the starting material and the product. The product has a different Rf value than the starting material, making it easier to track the progress of the reaction. In conclusion, the main purpose of following the course of a reaction by TLC is to determine if all the starting material is converted to the product.

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One example of a mineral that serves as a cofactor in chemical reactions is zinc. Zinc is a cofactor for a variety of enzymes involved in cellular metabolism, including enzymes involved in DNA synthesis and repair, protein synthesis, and cell division.

Zinc is also important for maintaining proper immune function and wound healing. Some examples of enzymes that require zinc as a cofactor include carbonic anhydrase, which is involved in the regulation of acid-base balance in the body, and alcohol dehydrogenase, which is involved in the metabolism of alcohol. Zinc is found in a variety of foods, including meat, seafood, nuts, and seeds, and is also available as a dietary supplement.

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1. The water inside a plant will not be able to come out.

2. It would kill the plants and species on Earth.

3. There would be no lakes, ocean, or water on land.

Answer:

5.5 mol H2O

Explanation:

Given over what you need and then mole ratio of coefficients in the balanced equation then cross multiply and do PEMDAS for that, and then you got your answer :) hope this helped.

The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g

CO₂ —> C + O₂

From the balanced equation above,

1 L of CO₂ decomposed to produce 1 L of C.

Therefore,

37 L of CO₂ will also decompose to produce 37 L of C

At standard temperature and pressure (STP),

22.4 L = 1 mole of C

Therefore,

37 L = 37 / 22.4

37 L = 1.65 mole of C

Thus, the mass of Carbon can be obtained as follow:

Mass = mole × molar mass

Mass of C = 1.65 × 12

Mass of C = 19.8 g

Thus, 19.8 g of carbon were obtained from the reaction.

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Bohr's model lacked orbitals again for electrons or the electron cloud, contrary to Dalton's theory, which was founded on the idea that every element is made up of its own distinct variety of an indivisible atom.

According to the theory, an atom contains a small, dense, positive charge centre known as the nucleus, where practically every bit of mass was concentrated. Light, particles with negative charges called electrons then orbit far from the nucleus in a manner similar to how planets circle the Sun.

Dalton proposed his atomic hypothesis based on all of his observations. It's frequently called the billiards ball model. Due to the lack of understanding of the atomic electrons and the nucleus at the time, he described an atom as a ball-like structure.

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Answer:

B.)Schrodinger's model

Explanation:

Answer:

A) They are both solid.

Answer:

O generates power on a smaller scale

Explanation:

The other two options are benefits of renewable energy. You're looking for a con instead of a pro.

The ionization constant Ka for the weak monoprotic acid if the 0.30 molar solution has the pH of 4 is 3.34 × 10⁻⁶.

The monoprotic acid is the type of the acid that can be donate the only one proton.

Let us consider the weak monoprotic acid that is CH₃COOH, the chemical equation is as  :

             CH₃COOH   ⇄   CH₃COO⁻  +  H⁺

Initial         0.30                      0               0

At eq.       0.30 - x                 x               x

The value of the pH is as :

pH = 3

[H⁺] = 10⁻³ = x

The expression for the Ka is as :

Ka = (10⁻³ )² / (0.30 - 0.001)

Ka = 10⁻⁶ / 0.299

Ka = 3.34 × 10⁻⁶

The ionization constant Ka for the weak monoprotic acid is 3.34 × 10⁻⁶.

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Answer:

C38H

Thank You!  :)

The position in extremity from most to least is water, ethanol, ethyl acetic acid derivation, CH3)2CO, 2-butanone, diethyl ether, hexane, and benzene.

From these solvents, ethanol will be totally miscible in water because of its more modest carbon fasten and it's capacity to frame hydrogen bonds.

Water is a polar dissolvable; other polar solvents incorporate CH3)2CO, acetonitrile, dimethylformamide (DMF), dimethylsulfoxide (DMSO), isopropanol, and methanol.

One way you could really work out a dissolvable's extremity is by utilizing its dielectric consistency, which is utilized to quantify how well the dissolvable can part of the way drop the field strength of the electric field of a molecule added to it. The higher the worth of a dissolvable's dielectric consistent, the more polar it will be.

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the phase of the copper product after the reaction in the copper cycle is listed below

1.the heating of Cu(OH)2 to form CuO i.e

Cu(OH)2 (s) ⇒ CuO(s) + H2O (l) which means the product of copper is in a solid phase after the reaction.

2.the addition of NaOH to Cu(NO3)2 to form Cu(OH)2 i.e

Cu(NO3)2 (aq) + NaOH (aq) ⇒Cu(OH)2 (s) + 2NaNO3 (aq) which means the product of copper is in the solid phase after the reaction.

3. the addition of HCL to CuO to form CuCl2 i.e

2 CuO(s) + 2 HCl(aq)  ⇒ 2 CuCl2(aq) + H2O (aq) which means the product of copper is in the aqueous/liquid phase after the reaction.

4. the addition of Al to CuCl2 to form Cu i.e

Al(s) + CuCl2(aq) ⇒ AlCl3(aq) + Cu(s) which means the product of copper is in a solid phase after the reaction.

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The expression to be rearranged K = [CO][Cl₂] [COCI₂]  are x = 0.327 or x = 339.

The expression to be rearranged K = [CO][Cl₂] [COCI₂] is:

(0.156 - x) (0.156 - x) (0.263 + x) = 5.00 × 10⁻²

We will expand and simplify the expression:

(0.156 - x) (0.156 - x) (0.263 + x) = 5.00 × 10⁻²(0.156)² + (0.156)(x) - (x)(0.156) - (x)² (0.263 + x)

= 5.00 × 10⁻²(0.156)² - (0.263)(0.156)(x) - (0.156)(x) + (0.263)(0.156)(x) + x²(0.263 + x) - 5.00 × 10⁻² = 0

After simplifying:

-0.0132302 x² - 0.001002 x + 0.0014256 = 0

This is in the form ax² + bx + c = 0 where a = -0.0132302, b = -0.001002 and c = 0.0014256

Using the quadratic formula, we have:

\(\[x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\]\)

Substituting values, we get:

\(\[x = \frac{-(-0.001002) \pm \sqrt{(-0.001002)^2-4(-0.0132302)(0.0014256)}}{2(-0.0132302)}\]\)

Solving, we get:x = 0.327 or 3.39 × 10²

Therefore, the solutions are x = 0.327 or x = 339.

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