How many moles are in a system that is 223 K, with an internal pressure
of 10 atm, in a fixed container that is 27 L
O 14.75 mol
O 1.21 mol
O 825 mol
5.42 mol
* 2 points

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.

A compound is formed by the combination of two or more different atoms. The white dot and black dot in the image are two different elements which combines together to form the compound AB.

Atoms are the basic units of every substances. Atoms combines to form molecules and molecules combines to form compounds. Thus compounds are chemical substances formed by the combination of different atoms.

For instance two oxygen atoms combines to form O₂ molecule similarly H₂, N₂ etc. can be formed from their respective atoms. When atoms of two different elements combines together they form compounds such as H₂O CO₂ etc.

These compounds can be formed through a specific type of chemical bonding such as ionic bonding, covalent bonding etc. The bond type depends on the nature of bonding atoms.

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Answer:

Third choice

Explanation

Because reactivity of the elements decrease across the periodic table and it depends on the number of protons it has. Hence low number of protons more reactive.

Answer:

N, P, As, Bi, Mc

Explanation:

Similar chemical properties are usually found within the same column of the periodic table.

Antimony is Sb, which is in column 15.

Therefore all the elements in column 15, including N, P, As, Bi, Mc, should have similar chemical properties

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:

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 balanced net ionic equation for the reaction between potassium sulfide and lead(II) nitrate is Pb²⁺(aq) + S²⁻(aq) → PbS(s)

From the question, we are to write the balanced net ionic equation for the given chemical reaction.

The given chemical reaction is

K₂S(aq) + Pb(NO₃)₂(aq) →

The between potassium sulfide and lead(II) nitrate will produce potassium nitrate and lead sulfide.

That is,

K₂S(aq) + Pb(NO₃)₂(aq) → KNO₃(aq) + PbS(s)

Now, balance the equation

K₂S(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbS(s)

Write the complete ionic equation

2K⁺(aq) + S²⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq)  → 2K⁺(aq) + 2NO₃⁻(aq) + PbS(s)

Cancel out the spectator ions

S²⁻(aq) + Pb²⁺(aq)   → + PbS(s)

Hence, the balanced net ionic equation is

Pb²⁺(aq) + S²⁻(aq) → PbS(s)

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Answer:

1s2 2s2 2p4

Explanation:

The specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat is 0.44J/g°C.

The specific heat capacity of a metal can be calculated using the following:

Q = mc∆T

Where;

According to this question, a 95.01 g piece of an unknown metal exhibits a 45.2°C temperature change upon absorbing 1870 J of heat. The specific heat capacity can be calculated as follows:

1870 = 95.01 × c × 45.2

1870 = 4294.452c

c = 0.44J/g°C

Therefore, 0.44J/g°C is the specific heat capacity of the metal.

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Explanation:

C

as the girl applies a resultant force on the volleyball causing it to accelerate, there's an unbalanced force acting on the ball.

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 reaction the reversible reaction is given as :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

The photosynthesis is to convert carbon dioxide and water and light in into glucose and oxygen.

photosynthesis :

6CO₂    +    6H₂O   + Heat    ------>     C₆H₁₂O₆    +    6O₂

In cellular respiration organism release energy stored in the chemical bond of glucose.

C₆H₁₂O₆    +    6O₂   ----->  6CO₂    +    6H₂O   + Heat    

The reversible reaction can be as follows :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

                       reactants                      products

C                             6                                6

H                             12                                12

O                             18                                 18

The number of atoms present in reactant side is equal to the number of atom in product side. the equation is balanced.

6 moles of carbon dioxide produce 1 mole of oxygen

6 mole of water produce 1 mole of carbon dioxide

Thus, the reversible reaction given as:

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

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3.2 moles of NaOH will neutralize 1.6 moles of H₂SO₄

A molar ratio is a ratio between the amounts (moles) of any two compounds that participate in a chemical reaction. It is the conversion factor between compounds in a chemical reaction and is derived from the compound's coefficients of the balanced equation. Therefore, molar ratios are used to convert the amounts of compounds in a chemical reaction.

For the given reaction:

H₂SO₄ + 2NaOH = Na₂SO₄ + 2H₂O

The above reaction is a balanced reaction and indicates that two molecules of NaOH are involved with one molecule of H₂SO₄ for neutralization. So, this gives the mole fraction of 1: 2.

Now, considering the mole ratio of H₂SO₄ to NaOH, which is 1: 2. For every mole of the sulphuric acid the reaction requires twice the moles of the sodium hydroxide.

Since the given moles of H₂SO₄ = 1.6 moles

Moles of  NaOH = 2 × 1.6

= 3.2 moles

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The concentration of the unknown [tex]H_3PO_4[/tex] solution would be 0.0368 M

The equation of the reaction is as follows:

[tex]H3PO_4(aq)+3NaOH(aq)--- > 3H_2O(l)+Na_3PO_4(aq)[/tex]

The mole ratio of the  [tex]H_3PO_4[/tex] solution to the NaOH solution is 1:3.

But 0.140 M, 25.24 mL of NaOH was used.

Recall that: mole = molarity x volume (in Liters)

Mole of 0.140 M, 25.24 mL of NaOH = 0.140 x 25.24/1000

                                                             = 0.0035336 mol

Following the mole ratio, the equivalent mole of [tex]H_3PO_4[/tex] would be:

0.0035336 /3 = 0.00117786666

Recall that: molarity = mol/volume (in Liters)

Molarity of 0.00117786666 mol, 32.00 mL [tex]H_3PO_4[/tex] = 0.00117786666/0.032

                                                                                  = 0.0368 M

In other words, the molarity of the [tex]H_3PO_4[/tex] solution to 3 significant figures is 0.0368 M.

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The electrons that are being lost gained or shared by each atom are Shared electrons.

Atoms and chemical species lose and gain electrons as they react to gain stability. Therefore, metals usually donate electrons to nonmetals to form cations. The number of electrons depends on their position on the periodic table. When an atom gains an electron, its overall charge becomes negative.

When an atom loses an electron its overall charge becomes positive. When an atom gains or loses electrons, its mass does not change. The number of electrons an atom can lose and gain share during a chemical reaction is called its valence. An atom that loses an electron gains a positive charge because it has fewer negatively charged electrons to balance the positive charge of the protons in the nucleus.

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According to research, the ear is a complex organ that meets hearing, being of great importance to humans.

Hearing is a physiological process where sound waves, which are vibrations, enter through the outer ear and reach the middle ear, causing the eardrum to vibrate.

In this sense, the vibrations, in turn, cause the movement of small bones called stirrup, anvil and malleus, where they reach the organ of Corti, stimulating the auditory nerve and finally become nerve impulses that reach the brain.

Therefore, we can conclude that according to research, hearing is a process that implies that sound waves first impact the eardrum until finally reaching the auditory centers of our brain.

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In the combustion of methane the are reactants are CH₄(g) and O₂(g). The products are CO₂(g) and H₂O(g) .

Combustion is process in which the substance react with the oxygen to produce heat. In the combustion of , the methane , CH₄ is burnt in the presence of oxygen, O₂ produce carbon dioxide, CO₂ and water H₂O. it is very useful as fuel source. the chemical reaction is given as follows :

CH₄(g)   +     2O₂(g)   ---->   CO₂(g)   +     2H₂O(g) . + heat + light

Thus, In the combustion of methane the are reactants are CH₄(g) and O₂(g). The products are CO₂(g) and H₂O(g).

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Based on the given frequency of the wave, the wavelength of the wave is 3.75 * 10⁻⁷ m.

The frequency of a wave is the number of complete oscillations performed by the wave per second.

The wavelength is the distance between successive points on the wave.

The relationship between the wavelength and frequency of a wave is given below:

Wavelength = velocity / frequency

Assuming the given wave is an electromagnetic wave, the velocity of the wave is 3.0 * 10⁸ m/s

Wavelength = 3.0 * 10⁸ m/s / 8.50 * 10¹⁴ s⁻¹

Wavelength = 3.75 * 10⁻⁷ m

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Answer: gain 3

Explanation:

elements want to have a total of 8 valence electrons to become stable like the noble gases! Hope this Helps.

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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Considering the definition of percentage by mass, 448 grams of a 12.5 % sugar solution contain 56.0 g of sugar

The percentage by mass expresses the concentration and is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percent by mass= (mass of solute÷ mass of solution)×100%

In this case, you know:

Replacing in the definition of percent by mass:

12.5%= (56 g÷ mass of solution)×100%

Solving:

12.5%÷ 100%= 56 g÷ mass of solution

12.5%÷ 100%= 56 g÷ mass of solution

0.125= 56 g÷ mass of solution

0.125× mass of solution= 56 g

mass of solution= 56 g÷ 0.125

mass of solution= 448 g

Finally, the mass of solution is 448 grams.

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The bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.

Bond enthalpy is defined as the amount of energy needed to dissolve one mole of a certain type of bond between two gaseous atoms.  In general, the amount of energy acquired or lost during a reaction is comparable to the process's change in enthalpy.

Given the bond enthalpy of F2 = 156.9 kJ/ mole

The ΔH can be calculated as

ΔH = bond enthalpy of F2 / 2

ΔH = 156.9 kJ/mole / 2

ΔH = 78.5 kJ/mole

Thus, the bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.

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The most likely way in which an atom of magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.

The octet rule is described as a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

The octet rule is held responsible for the relative inertness of the noble gases and the chemical behavior of certain other elements.

Magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.

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Answer:

by losing two electrons

Explanation:

I got it right on edge 2023

good luck

15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

What is moles ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.

The mole designates 6.02214076 1023 units, which is a very large number. For the International System of Units (SI), the mole is defined as this number as of May 20, 2019, according the General Conference on Weights and Measures. The number of atoms discovered through experimentation to be present in 12 grams of carbon-12 was originally used to define the mole.

C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O

2 unit of O2 produces 2 unit of CO2

15g of O2 produces 15g of CO2

15g of CO2 will be produced from 15g of O2  as 2 moles of O2 produces 2 moles of CO2

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Answer:

Make Li-Ion batteries.

Produce commercial electric vehicles.

Create underwater subsea electrification.

Power telecommunication devices.

Explanation:

Minerals are essential raw materials in our daily lives, and are vital for economic, social and technological development. For example, in the following:

Agriculture: Phosphate rock, potash and lime are used in agricultural fertilisers and other mineral products are used to improve soil. The water you drink uses minerals to make it clean.

Construction: About 60 tonnes of aggregate are used to build an average house in the UK. If we include the associated infrastructure, this can be as high as 400 tonnes.

Minerals are used in building houses, schools, libraries, hospitals, offices and shops. Buildings use a wide range of minerals:

iron (as steel) in the framework of large building,

clay in bricks and roofing tiles,

slate for roofing tiles,

limestone, clay, shale and gypsum in cement,

gypsum in plaster,

silica sand in window glass,

sand and gravel and crushed rock as aggregates for fill and in concrete,

copper for plumbing and wiring,

clays for bathroom fixtures and fittings and tiles,

paint may include pigments, extenders and fillers from mineral sources.

Answer: toothpaste

Explanation:

Answer:

Na,Ba,Ti on the same base placement on the periodic table.

Answer:

O,S,Se

Explanation:

Because they lose electrons and become an anion to become ionicly bonded and they are in the same period

X-rays and gamma rays have frequencies higher than microwaves but lower than UV radiation.

X-rays and gamma rays are both types of electromagnetic radiation. They are similar in that they are both invisible, travel at the speed of light, and can penetrate human tissue. They differ in their wavelength and energy. X-rays have a shorter wavelength and higher energy than gamma rays

Gamma rays are a type of electromagnetic radiation. They are the most energetic form of electromagnetic radiation. Gamma rays are produced by the most energetic events in the universe, such as supernova explosions and the merging of neutron stars.

X-rays are used in medicine and dentistry because they can penetrate the human body, which Gamma rays cannot.

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Answer:

13.89

Explanation:

13.89 moles (mole =mass)