Is it polar or non polar ?

Among the given compounds, H[tex]_2[/tex]S dissolves in water.

The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.

CBr[tex]_4[/tex], C[tex]_6[/tex]H[tex]_6[/tex], and CCl[tex]_4[/tex] are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H[tex]_2[/tex]S  is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.

Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.

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Early "chemists" focused on practical problems - the production of dyes and perfumes, the production of soap, the use of metals, the production of glass, etc. The goal was not to make sense of the physical world.

Tapputi (also known as Tapputi-Belatekallim, referring to the female attendants of the palace), believed to be the world's first recorded chemist and perfume maker, mentioned in a cuneiform tablet from Babylonian Mesopotamia, circa 1200 BC It is BC is mentioned.

Along with Lavoisier, Boyle, and Dalton, Berzelius is considered the father of modern chemistry. In 1828, using oxygen as a standard and fixing its weight at 100, he produced a table of relative atomic weights containing all the elements known at the time.

Very early chemists were often motivated primarily by achieving a particular goal or product. It didn't take a lot of theory to make perfume or soap, just a good recipe, and attention to detail. There was no standard way to name substances (and no periodic table we could all agree on).

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Answer:

Strontium is a chemical element with symbol Sr and atomic number 38. Classified as an alkaline earth metal, Strontium is a solid at room temperature.

Explanation:

Answer:for making the text look colored and bold

Explanation:It can reacting differently with different mass solution, it also depends on what concentration you're measuring, and what reaction

The nuclear equation for this reaction shows the gamma rays that are released when cobalt-60 is produced. 5927Co+10n⟶6027Co+γ

What is nuclear reaction ?

In nuclear physics and chemistry, a nuclear reaction is the process by which two atomic nuclei or nuclei and external particles collide to produce one or more new nuclides. Therefore, a nuclear reaction must transform at least one nuclide into another nuclide. When a nucleus interacts with another nucleus or particle and they separate without changing the properties of the nuclide, this process is simply called a form of nuclear scattering and is not a nuclear reaction.

Although in principle two or more particles could react and collide, the probability of three or more nuclei colliding in the same place at the same time is much lower than for two nuclei, so such Incidents are very rare.

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To calculate the new volume of a gas, we must first understand the atm.

What is atm?

oceanic atmospheric pressure At sea level, it has a mean value of about and is defined as the pressure created by the weight of the atmosphere. Sometimes, this figure is used as a standard pressure or a reference pressure. The unit of pressure is atm.

What does one atmosphere of pressure equal?

760 cm of mercury is equal to one atmosphere of pressure at sea level.

Using the atm formula,

P1 V1/T1 = P2 V2/T2

15×28/500= 18×V2/500

15×28×400/500×18 = V2

V2=29.166

V2=29.17 L

Therefore the option (B) is correct.

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The volume of a 2.50M NaOH solution required to make 725 mL of a 0.150M NaOH solution is 43.5mL.

The volume of a solution can be calculated using the following expression:

CaVa = CbVb

Where;

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

According to this question, 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution. The volume required can be calculated as follows:

2.5 × Va = 725 × 0.150

2.5Va = 108.75

Va = 43.5mL

Therefore, 43.5mL is the volume of the solution.

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The Gibbs free energy of the system is - 12.7 kJ/mol.

The term Gibbs free energy has to do with the amount of thermodynamic work that could be done by a system. We know that we can find the Gibbs free energy by the use of the equilibrium constant and the temperature of the system and that is what we have to do in this question as we do it.

We know that;

ΔG = -RTlnK

ΔG = The Gibbs free energy

R = gas constant

T = temperature

K = equilibrium constant

Thus;

R = 8.314 J/K/Mol

T = 25°C + 273 = 298 K

K =  1.7 x 10^2

When we substitute the values, we have;

ΔG =-(8.314  * 298 * ln  1.7 x 10^2)

ΔG =- 12.7 kJ/mol

We can see from the calculation that we are going to have the Gibbs free energy of the system thus described as - 12.7 kJ/mol.

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The given reaction is an exothermic reaction thus, heat is evolved in the reaction. Thus increasing temperature increases the rate of reverse or backward reaction. Increasing concentration of ozone and O will increase the rate of forward reaction.

According to collision theory, the rate of a reaction depends on the number of effective collisions of the reactants. The given reaction is the combination of ozone with oxygen to give oxygen molecule.

This reaction is exothermic, hence increasing the temperature will effect the equilibrium so as to consume the extra temperature reverse reaction will take place by which collision of O₂ molecules increases.

Similarly increasing the concentration of reactants O₃ and O will increase the rate of forward reaction. The enthalpy change is negative here indicating the reaction is exothermic, thus, increase the temperature and use of catalyst also decreases the activation energy ΔE.

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The empirical formula for the leaked gas, given it contains 1.54 grams of nitrogen and 0.277 grams of hydrogen is NH₃

The empirical formula for the leaked gas can be obtained as illustrated below:

Divide by their molar mass

N = 1.54/ 14 = 0.11

H = 0.277 / 1 = 0.277

Divide by the smallest

N = 0.11 / 0.11 = 1

H = 0.277 / 0.11 = 3

Thus, from the above calculation, we can conclude that the empirical formula of the gas is NH₃

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In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.

The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.

On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.

Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.

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The concentration of the solution is obtained as 0.08 M.

We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]

Thus;

Concentration of the acid CA =  0.200 M

Volume of the acid VA = 10.00 mL

Volume of the base VB = 25.05 mL

Concentration of the base CB = ??

Number of moles of the acid NA = 1

Number of moles of the base NB = 1

Then;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB= CAVANB/VBNA

CB = 0.200 M *  10.00 mL * 1/ 25.05 mL * 1

= 0.08 M

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A = 2.86 x [tex]10^{23[/tex] molecules of  [tex]KMnO_4[/tex]

B = 323.76 grams of Al

C = 1.53 moles of Au

D = 7.71 x [tex]10^{23[/tex] molecules of [tex]H_3PO_4[/tex]

E = 4.52 x [tex]10^{23[/tex] total atoms

According to Avogadro, a single mole of any substance contains 6.022 x [tex]10^{23[/tex] molecules or atoms of the substance.

Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;

mole = mass/molar mass

These theories are what we need to solve the outlined problems.

       Mole of 75 g of [tex]KMnO_4[/tex]:

       mass/molar mass = 75/158

                                     = 0.4747 mol

        Since 1 mole = 6.022 x [tex]10^{23[/tex] molecules

         0.4747 mole = 0.4747 x 6.022 x [tex]10^{23[/tex]

                                = 2.86 x [tex]10^{23[/tex] molecules

       Since 1 mole =  6.022 x [tex]10^{23[/tex] molecules or atoms

        7.23 x [tex]10^{24[/tex] atoms = 7.23 x [tex]10^{24[/tex] / 6.022 x [tex]10^{23[/tex]

                                     = 12 moles

        Mass of 12 moles Al = 12 x 26.98

                                          =  323.76 grams    

                                    = 1.53 moles

                                   = 1.28 moles

         1.28 moles = 1.28 x 6.022 x [tex]10^{23[/tex]

                            = 7.71 x [tex]10^{23[/tex] molecules

                                        = 4.52 x [tex]10^{23[/tex] atoms

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Answer:

"When the same amount of electricity is passed through different electrodes, the mass of electrodes liberated during electrolysis is directly proportional to its chemical equivalent."

The pressure of a sample of gas placed in a 25.0L container at STP is 0.98atm.

The pressure of an ideal gas can be calculated by using the following formula:

PV = nRT

Where;

According to this question, a sample of gas is placed in a 25.0 L sealed container at STP. The container is heated to 25°C. The pressure in the container is as follows:

P × 25 = 1 × 0.0821 × 298

25P = 24.47

P = 0.98atm

Therefore, 0.98atm is the pressure of the gas

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The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.

characteristics of elements in group 7

At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.

Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).

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According to the given information Group in which no response is expected is a negative control.

The correct option is C.

A scientist may develop the hypothesis that a given type of tomato will be red if it carries the gene for the colour red. The scientist then discovers that every tomato of this variety is red during investigation.

Hypotheses are frequently employed to promote scientific research and enhance knowledge. These clear declarations serve as the cornerstone for all research experiments. Therefore, a problem in the creation of a hypothesis may lead to errors in the design of a whole experiment.

As previously said, a hypothesis serves as a response to the research question and directs the gathering and analysis of data. Researchers can use hypotheses to both identify relationships between variables and forecast relationships based on theoretical principles and/or empirical data.

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K₄ [Fe (CN)₂] is a coordination compound where the oxidation number of Fe is -2. But the negative charge for metal iron is not possible and the actual formula is K₄ [Fe (CN)₆] .

A coordination compound is a complex where an ionic or neutral ligand is coordinated to a metal. The oxidation state of the metal is called the primary valence of the complex.

Here, there are 4 potassium outside the coordination sphere and thus +4 charge is outside hence -4 charge have to be inside to neutralize the compound. The charge of one CN is -1. Thus -2 for two CN.

Total charge is -4 and that of 2CN is -2, thus charge of Fe is -4-(-2) = -2.

Actually this compound do not exists. The correct coordination formula is K₄ [Fe (CN)₆] where Fe is +2 oxidation state.

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The hissing sound from the water bottle occurred due to increase in thermal energy of the car which is the immediate environment of the water bottle.

Thermal energy is defined as the type of energy that expresses the flow of heat through a medium.

When there is increase in heat energy, outside the an enclosed medium such as a car, all the contents within the medium also increases in temperature.

There is also a rise in temperature of water in the water bottle and this causes the water molecules to gain energy, vibrate and collide more often among each other.

The hissing sound occurs due to a rise in pressure of the water occuring due to rise in temperature.

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Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

q = n ×ΔH

where

q = amount of heat= ?

n = no of moles

ΔH = enthalpy  ( 6.02 kJ/ mol)

n = w / M.M

w = given mass =39.4g

M.M = molar mass ( molar mass of water)=18g/mol

n =39.4/ 18

 =2.18

Substituting all the given values, we get

q = n ×ΔH

   = 2.18 ×6.02

   = 12.401 kJ

   =13.12KJ

Therefore, 13.12KJ of heat is required  to melt 39.4 g of ice at (0 ∘C ).

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Option B. 1n 18 minutes the concentration of a solution of 0.600 M changes to 0.300M.

An order of first-order kinetics in which the rate of the reaction relies upon the concentration of only one reactant, and is proportional to the amount of the reactant. it could be represented via the equation, charge = kA, in which ok is the reaction fee steady, and A is the concentration of the reactant.

Calculation:-

T = 2.303/k log a/(a-x)

K = 2.303/T log a/(a-x)

   = 2.303/54 log(0.600/0.0750)

  K = 2.303/54 log 8

       = 2.303/54 × 0.9

        = 0.038

new concentration = 0.300M

  T = 2.303/k log a/(a-x)

       = 2.303/ 0.038  log 0.600/(0.300)

        = 0.693/0.038

        = 18.2 minutes

 or 18 minutes approx.

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The volume (in L) of O₂ gas, measured at 792 mmHg and 23 °C, that is required to completely react with 52.6 g of Al is 34.14 L

We'll begin by obtaining the mole of O₂ that reacted. This can be obtained as follow:

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂

Therefore,

1.948 moles of Al will react with = (1.948 × 3) / 4 = 1.461 mole

Finally, we shall determine the volume of the O₂ required. Details below

PV = nRT

1.042 × V = 1.461 × 0.0821 × 296

Divide both sides by 1.04

V = (1.461 × 0.0821 × 296) / 1.04

V = 34.14 L

Thus, the volume required is 34.14 L

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The total moles of ions produced when dissolving 9.44 g of CuSO₄.5H₂O completely in water is 0.0756.

A mole is described as a scientific unit for the measurement of a large number of quantities of ions, atoms, molecules, or other particular particles.

The number of entities present in one mole is equal to 6.023 × 10 ²³ is known as Avogadro’s number.

Given, the mass of CuSO₄.5H₂O sample = 9.44 g

The mass of 1 mole of CuSO₄· 5H₂O = 250 g/mol

Number of moles of CuSO₄· 5H₂O = 9.44/250 = 0.0378 mol

The dissociation of CuSO₄· 5H₂O when dissolved in water as:

[tex]CuSO_4.5H_2O \longrightarrow Cu^{2+} (aq) + SO_4^{2+} (aq) + 5H_2O (l)[/tex]

The number of Cu²⁺ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378

The number of SO₄²⁻ ions of 0.0378 mol of CuSO₄· 5H₂O = 0.0378

Total moles of ions in the given sample= 0.0378 + 0.0378 = 0.0756 mol

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The limiting reactant in the reaction is NaOH. one mole or 40 g of NaOH gives 58.5 g of NaCl. Thus, 4.16 g have to give 6.08 g but the actual yield is 5.79 g. Thus the percent yield of the reaction is 95%.

Percent yield of a reaction is the ratio of actual yield to the theoretical  yield multiplied by 100.

The molar mass of NaOH is 40 g/mol. Thus number of moles of NaOH is 4.16 /40 = 0.10 moles. Similarly the molar mass of HCl is 36.5 g/mol and number of moles in 5.81 g is 5.81/ 36.5 = 0.15 moles.

One mole of HCl needs 1 mole of NaOH, thus 0.15 moles need 0.15 moles NaOH but we have 0.1 only. Thus, NaOH is the limiting reactant.

40 g of NaOH gives 58.5 g of NaCl (1 mole). Thus the theoretical yield for 4.16 g of NaOH  is :

=  ( 4.16 × 58.5 )/40

= 6.04 g.

The actual yield is 5.79 g. Thus percent yield =(5.79/6.04) × 100 = 95%.

Hence, the percent yield of the reaction is 95%.

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The volume of the 2.186×10⁻² mole of N₂ gas under identical temperature and pressure conditions will also be 365 mL

We'll begin by obtaining the pressure of NH₃. This can be obtained by using the ideal gas equation as illustrated below:

PV = nRT

Divide both sides by V

P = nRT / V

P = (2.186×10⁻² × 0.0821 × 305) / 0.365

P = 1.5 atm

Finally, we shall determine the volume of the N₂ under identical (i.e the same) temperature and pressure conditions. This is illustrated below:

PV = nRT

Divide both sides by P

V = nRT / P

V = (2.186×10⁻² × 0.0821 × 305) / 1.5

V = 0.365 L

Multiply by 1000 to express in liters

V = 0.365 × 1000

V = 365 mL

Thus, the volume is 365 mL

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The mass in grams of sulfuric acid, H₂SO₄, that will be produced by the complete reaction of 40.01 grams of sulfur trioxide is 49.01 grams

We'll begin by obtaining the reacting mass from the balanced equation. This is shown below

SO₃(g) + H₂O(l) → H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Finally, we shall determine the mass of sulfuric acid, H₂SO₄ produced as illustrated below:

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

40.01 g of SO₃ will react to produce = (40.01 × 98) / 80 = 49.01 g of H₂SO₄

Thus, the mass of sulfuric acid, H₂SO₄ produced is 49.01 g

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Have two sides that mirror each other along one plane through the central axis called as symmetrical

The line of centroids or central axis is defined as the line that passes through the centroids along the beam and the cross section are then defined as the beam section which are perpendicular to the central axis and that two side are mirror images of each other and place a mirror on the fold then image of one side of the picture will fall exactly on the other side of the picture and that are called as symmetrical means same

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Answer:

the number of protons in the nucleus of an atom. the number of protons define the identity of an element

The volume of the concentrated HNO₃ that would be required to prepare 842 mL of 7.77 M HNO₃ is 414 mL

We can obtain the volume of the concentrated HNO₃ required to prepare 842 mL of 7.77 M HNO₃ by using the dilution formula as shown below:

M₁V₁ = M₂V₂

15.8 × V₁ = 7.77 × 842

15.8 × V₁ = 6542.34

Divide both side by 15.8

V₁ = 6542.34 / 15.8

V₁ = 414 mL

Thus, the volume of concentrated HNO₃ required is 414 mL

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