Why do all elements have their own unique color? Please explain.

Answer:

option d rain evoporates

Answer:

D. Rain Evaporates

Explanation:

Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds. Clouds move over the globe and drop rain and snow.

The empirical formula of compound is C₃H₇O₃. The molecular formula is 1, 2, 3, tri hydroxyl propane.

What is molecular formula ?

The molecular formula is an equation that specifies how many atoms of each element there are in a single compound's molecule. It displays the precise amount of atoms present in a molecule.

Propane, for instance, has the chemical formula C4H10. The given compound has a formula of 4 carbon atoms and 10 hydrogen atoms.

The empirical  formula of compound is C₃H₇O₃.

Then, ( 12 × 3 ) + ( 1 × 7 ) + ( 16 × 3 )

= 36 + 7 + 48

= 91

( 39.6 ) + ( 7.75 ) = 47.35

91 - 47.35

= 43.65

Thus, molecular formula of given compound is 1, 2, 3, tri hydroxyl propane.

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The correct summary of the properties is; Metals are generally very shiny, good conductors, high in density, and melt at high temperatures. Nonmetals are generally dull, poor conductors, low in density, and melt at low temperatures. Metalloids exhibit properties of both metals and nonmetals, make fair conductors, and can appear as shiny or dull.

Materials are of course composed of matter and mater is composed of atoms of elements. There are three main classes of the elements that we have in the periodic table. The classes of the elements are known as;

1) Metals

2) Non metals

3) Metalloids

Metals do conduct electricity while the non metals just do not conduct electricity. The metalloids would acts as conductors of electricity under certain circumstances.

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Answer:

b

Explanation:

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From the calculations, the new volume of the gas is 30.2 L.

We know that we can be able to obtain the parameters that ahs to do with the gas by use of any of the equations of the laws that relate to an ideal gas.

Given that the;

Initial volume [tex]V_{1}[/tex] = 35.0 L

Initial temperature [tex]T_{1}[/tex] =  268 K

Initial pressure [tex]P_{1}[/tex]  = 5.16 atm

Final temperature [tex]T_{2}[/tex] = 343 K

Final pressure [tex]P_{2}[/tex] =  7.65 atm

Final volume [tex]V_{2}[/tex] = ??

Then we have to use the general gas equation;

[tex]P_{1}[/tex] [tex]V_{1}[/tex]/ [tex]T_{1}[/tex]=  [tex]P_{2}[/tex] [tex]V_{2}[/tex]/ [tex]T_{2}[/tex]

[tex]V_{2}[/tex] =  5.16 * 35.0 *  343/7.65 * 268

[tex]V_{2}[/tex] = 61945.8/2050.2

[tex]V_{2}[/tex] = 30.2 L

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The final temperature (°C) of the air at this elevation is 326.3K.

The temperature of a gas can be calculated using the combined gas law equation as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, 1.20L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80L. The final temperature can be calculated thus:

1 × 1.2/298 = 0.730 × 1.8/T₂

0.004027T = 1.314

T = 326.3K

Therefore, 326.3K is the final temperature of the balloon.

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Answer:

State : Gaseous state  Colour : Pale yellow  Odour : Irritating

Explanation:

At 25 degree celsius which is approximately known as the room temperature, Fluorine being the highest electronegative element has weak van der waal forces due to which the electrons are apart from each other. At a high enough temperature(room temp. in this case) that is higher than their boiling point, the fluorine atoms become gaseous particles. Hope you understood my explanation....Happy Learning:)

The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.

The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.

Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.

Sodium is 11th element. The main shell electronic configuration is  K=2, L=8, M=1. Subshell electronic configuration is  1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.

Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.

Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.

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77.094*[tex]10^{23}[/tex]  molecules are in 12.80 moles of strontium bydroxide.

The chemical strontium hydroxide has a molecular weight of 121.6324 g/mol and the molecular formula Sr(OH)2. It appears in the form of an anhydrate with prismatic, colorless crystals that are liquescent.

The building By counting the number of components (and their corresponding quantities) listed in the chemical formula, one can easily determine that each molecule of the compound NaOH contains three atoms.

By mole concept-

1moleof strontium bydroxide =6.023*[tex]10^{23}[/tex] molecules of strontium bydroxide.

so,

12.80 moles of strontium bydroxide =12.80*6.023*[tex]10^{23}[/tex]

No of molecule =77.094*[tex]10^{23}[/tex] molecule

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The wavelength that is associated with the transition is  2145 nm.

We know that the wavelength can be obtained from the use of the Rydberg equation and we know that the Bohr's mode lets us know that an electron can move from from a higher to a lower energy level.

Let us write;

1/λ = RH(1/[tex]n_{2} ^2[/tex] - 1/[tex]n_{1} ^2[/tex])

λ = wavelength

RH = Rydberg constant

[tex]n_{1}[/tex] = initial level

[tex]n_{2}[/tex] = final level

Then;

1/λ = 1.097 * 10^7 (1/4^2 - 1/7^2)

1/λ = 1.097 * 10^7 ( 0.0625 - 0.020)

λ =  2145 nm

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Answer:

Explanation:

I forgot

Answer:

cellular respiration occurs both in plant and animal cells.

Explanation:

Cellular respiration definitely occurs in animals, it is how we break down glucose to get ATP. Plants first use photosynthesis to produce glucose and then need a way to produce ATP, being cellular respiration.

The volume of 0.180 M KOH that would be needed to completely react with 15.1 mL of 0.190 M [tex]H_2SO_4[/tex] will be  31.88 mL

The equation of the reaction involving KOH and [tex]H_2SO_4[/tex] is as follows:

[tex]2KOH + H_2SO_4 --- > K_2SO_4 + 2H_2O[/tex]

The equation is already balanced and the mole ratio of KOH and  [tex]H_2SO_4[/tex] is 2:1.

But 15.1 mL of 0.190 M  [tex]H_2SO_4[/tex]  is available.

Recall that:

mole = molarity x volume

Mole of 15.1 mL of 0.190 M  [tex]H_2SO_4[/tex] = 0.190 x 15.1/1000

                                                          = 0.002869 mol

From the 2:1 mole ratio, the equivalent mol of KOH would then be:

0.002869 x 2 = 0.005738 mol

Since, mole = molarity x volume. Then, volume = mole/molarity

So, the volume of 0.005738 mol of 0.180 M KOH would be:

volume = 0.005738/0.180

             = 0.03188 liters

Converting 0.03188 liters to mL:

   0.03188 x 1000 = 31.88 mL

Thus, the volume of 0.180 M KOH needed to react completely with 15.1 mL of 0.190 M H2SO4 would be 31.88 mL.

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1) We could use the bromine water test to tell the difference between the alkane and the alkene

2) We can use a detergent to wash a cloth that is contaminated by oil.

The term alkane has to do with a hydrocarbon that is composed of only a straight chain compound there are no multiple bonds in the alkane molecule and this is the difference between the alkane and the alkene. The alkene is composed of double bonds. The alkene compounds are able to decolorize bromine water while the alkanes can not.

If you have a contaminated cloth, you can be able to wash it by the use of a detergent because it is able to lift off the grease or oil by the use of the hydrophobic tail of the detergent.

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Each Hydrogen atom has 1 valence electron. Since Hydrogen can only fit a max of 2 valence electrons in its orbital, each Hydrogen atom only needs 1 electron. Each atom has 1 valence electron, so they can just share, giving each atom two electrons each.

Explanation:

[tex]density \: = \: mass \: over \: volume \\density \: 16grams \: over \: 7cm {}^{3} \\ density = 2.3g \cm {}^{3} [/tex]

Answer:

A) Warmer

Explanation:

it says above 0

Taking into account the definition of Avogadro's Number, 4.33656×10²⁵ molecules are in 72 moles of CO₂.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This particles can be found in the amount of one mole of said substance.

Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of CO₂ contains 6.023×10²³ molecules, 72 moles of CO₂ contains how many molecules?

amount of molecules of CO₂= (6.023×10²³ molecules × 72 mole)÷ 1 mole

amount of molecules of CO₂= 4.33656×10²⁵ molecules

Finally, 4.33656×10²⁵ molecules are present in 72 moles of CO₂.

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One mole of CS₂ and two moles of H₂S are formed as products and 3 moles of CH₄ are leftover.

A limiting reagent is a reactant that is fully exhausted from the reaction mixture at the completion of a  reaction. The limiting reactant will decide the maximum amount of product.

Given, a balanced chemical equation of the reaction between methane and sulphur is:

[tex]CH_4 + 4S\longrightarrow CS_2 +2H_2S[/tex]

Given, the number of moles of the sulphur = 4

The number of moles of methane = 4

From the chemical reaction, one mole of methane reacts with four moles of sulphur. Therefore, four moles of sulphur fully react with one mole of methane and three moles of methane leftover.

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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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A close-up photograph must be taken by the prosecutor to demonstrate the position of the body in relation to the rest of the crime scene.

For criminal investigation analysis, it becomes important to capture photographs from those areas in which acts of violence took place. To record the crime scene in more detail the photograph must be taken from close range and also with perfection. Close range photographs enables the viewer to understand where and how the crime was committed. The photographs of entry and exit of the crime scene is taken so carefully to observe the movement of the criminal before and after of the crime.

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Answer:  C

Explanation:

The balanced NET ionic equation is

Al(OH)3 ----> Al3+(aq) + 3OH(aq) (s)

When AICI and NaOH are combined in an aqueous solution, the following balanced NET ionic equation describes the reaction:

Al(OH)3 -----> Al3+(aq) + 3OH(aq) (s)

An exchange reaction occurs when AICI and NaOH are combined.

Al(OH)3(s) + 3NaCl(aq) -----> AlCl3(aq) + 3NaOH(aq) (1)

In this reaction, the ions Al+3 and Na+ exchange Cl- and OH- ions.

The total ionic equation must first be written in order to create the NET ionic equation:

AI(OH)3(s) + 3Na+(aq) + 3Cl(aq) + Al3+(aq) + 3Cl(aq) + 3Na+(aq) + 3OH (aq) (2)

Since the Al(OH), precipitates, we are unable to describe it as an ion because the aqueous solution does not allow for its dissociation.

The following is the net ionic equation for reaction

Al3+(aq) plus 3OH-(aq) leads to Al(OH)3(s)

The net ionic equation excludes all repeating ions from reactants and products. We eliminated the Na+ and Cl- ions from the net ionic equation because of this

The balanced net ionic equation is as follows:

Al(OH)3 ----> Al3+(aq) + 3OH(aq) (s)

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The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute÷ Volume of solution in liter

number of moles of solute =given mass÷ Molar mass of solute

number of moles of solute =mass÷30.03 g/mol

Molarity=0.314 M

Volume of solution=0.505 liters

Substituting all the given values, we get

0.314 M= {mass÷30.03 g/mol}÷ 0.505 liters

mass÷30.03 g/mol=0.15

mass =4.80g

Therefore, the mass of CH[tex]_2[/tex]O is 4.80g.

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The statement " Inertia and distance combine to keep Earth in orbit around the Sun and the Moon in orbit around Earth " is false.

According to Sir Isaac Newton, he proposed and concluded in his investigation that the earth is being kept in its orbit around the Sun and the Moon in orbit around Earth by means of gravity and inertia. This is not done through inertia and distance.

In conclusion, it can be deduced from the explanation given above that inertia and gravity combine to keep the earth in orbit around the Sun and the Moon in orbit around Earth.

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The concentration in mmol/L of the chemist's mercury(I) chloride solution. is 2.03 × 10^-8 M

We are given;

Number of moles of mercury (i) chloride as 0.000406 μmol

Volume is 200 mL

We are required to calculate the concentration of the solution.

We need to know that;

Concentration is also known as molarity is given by;

Molarity = Number of moles ÷ Volume

Number of moles = 4.06 × 10^-10 Moles

Volume = 0.02 L

Therefore;

Concentration = 4.06 × 10^-10 Moles ÷ 0.02L

                      = 2.03 × 10^-8 M

Thus, the molarity of the solution is 2.03× 10^-8 M.

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In this compound, there would be five proton NMR signals,

We know that the acronym NMR means nuclear magnetic resonance. It has to do with the kind of spectrum in which the kind of chemical environment where the proton is found would impact the spectrum that is observed in the compound.

The first thing that we need to look at and find out in the image is to be able to find out the number of chemical environments that we have in the compound as we can see it in the image.

By studying the compound closely, we can see that there are four different proton chemical environments that we can be able to see and map out from the compound and it is these chemical environments that tell us the number of signals to expect.

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The number of Joules in 6,458 Calories calculated to the correct number of significant figures would be 2.6790 x [tex]10^4[/tex] Joules.

Both Joules (J) and Calories (Cal) are units of energy. According to the standard unit of conversion:

1 kiloCalorie = 4148 Joules

Since, 1 kiloCalorie = 1000 Calorie

Then:

1000 Calorie = 4148 Joules

Thus;

1 Calorie = 4148/1000

               = 4.148 Joules

Now, let's see the number of Joules that is equivalent to 6,458 Calories.

1 Calorie = 4.148 Joules

6,458 Calories = 4.148 x 6,458

                         = 26787.784 Joules

According to one of the rules guiding significant figures when performing multiplication operations, the number with the lowest significant figure is considered for the significant figures of the final answer.

Thus, the final answer, in this case, would be to four significant figures.

In other words, 6,458 Calories = 2.6790 x [tex]10^4[/tex] Joules.

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Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL,

Given that :

Molarity of the solution M1 = 12 M

volume of the solution V1 = 35 mL

Molarity of the solution after the dilution M2 = 0.500 M

volume of the solution after the dilution V2 = ?

the dilution law states that :

M1 V1 = M2 V2

12 × 35 = 0.500 × V2

V2 = 840 mL

Thus, Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL.

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The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2

What is ore?

An ore is a naturally occurring deposit of geologic material (rock) that contains a sufficient quantity of one or more valuable elements or compounds to be economically mined. Metals such as copper, platinum, iron, lead, gold, silver, aluminium, nickel, and others are among these valuable elements. Nonmetals such as silicon and diamond may be found in ore. These valuable chemicals can be extracted and used in a variety of ways, from jewellery creation to electronic gadget manufacture. Ores vary greatly based on the parent rock's chemical composition as well as the natural mechanism by which they were created.

Mining corporations carefully analyse various issues before deciding to mine because extracting anything from the earth involves time, money, and effort. The ore grade, for example, indicates how much of the desired precious element or combination occurs inside the parent rock. The rock is regarded an ore if the required component is present in sufficient concentration for processing to be viable. Larger grade ores have higher concentrations of the desired ingredient, and vice versa.

Fe304 contains both Fe²+ and Fe³+

Then we have to deduce the ratio of Fe²+ and Fe³+.

We know that

Fe0  + Fe2O3 ---------> Fe3O4

Fe in Fe0 is Fe(II)

Fe in Fe2O3 is Fe(III)

Then we have see that

on combine Fe 2+ with Fe3  , Fe304 is form

Hence,

The ratio of Fe²+: Fe³+ in Fe3O4 is 1:2

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