How many valence electrons are in the outermost shell of all noble gases except helium?

The IUPAC name of the compound given in the question is 2,2,3-trimethylpentane

The naming of organic compounds has been made easier, owning to the the rules of the international union of pure and applied chemistry (IUPAC).

The IUPAC naming of organic compounds can be obtained by following these steps:

With the above information in mind, we can name the compound as follow:

Thus, the IUPAC name of the compound is:

2,2,3-trimethylpentane

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EXPLANATION:

Firstly, we need to define a solution

The solution is defined as a homogenous mixture of two or more substances in relative amounts that can be varied continuously.

Coke is an aqueous homogenous mixture of carbon dioxide, sugar, concentrate, etc The ingredient used in the production of coke are mixed in the right proportion and this make coke a homogenous solution

Temperature can affect the character of a coke. Carbonated soft drink tends to lose their fizz at high temperature. This is because as the temperature increases, the loss of carbon dioxide in the liquid will also increase.

Also, at high temperatures, the solubility of gases decreasese.

From the method of half-reactions, the balanced equation of the reaction is given below:

Eight electrons were transferred.

Half reactions are reactions that show the processes of oxidation and reductions that occur in a redox reaction as separate or individual reactions.

The half-reactions of the given equation are as shown below:

Oxidation:

Unbalanced -  S₂O₃²⁻ (aq) + H₂O (l) ---> SO₄²⁻ (aq) + H⁺ (aq)

Balanced - S₂O₃²⁻ (aq)  + H₂O (l) ---> 2 SO₄²⁻ (aq)  + 8 e⁻  + 2 H⁺ (aq)

Reduction:

Unbalanced - Cl₂ ---> Cl⁻

Balanced - 4 Cl₂ (g) + 8 e⁻ ---> 8 Cl⁻ (aq)

Overall balanced equation:  S₂O₃²⁻ (aq)  + H₂O (l) + 4 Cl₂ (g)  ---> 2 SO₄²⁻ (aq) + 2 H⁺ (aq) + 8 Cl⁻ (aq)

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The most powerful laser in the world fires a pulse at 25 fempto seconds producing 30 terawatts of power in physical sciences, power (watt) =Energy (J or kg•m²×s⁻²)/time (s)if the average laser fires 7.5 x 10²⁰ photons in a pulse, then wavelength of the light fired in the world’s most powerful laser is 37×10⁻¹⁰ nm

A laser is the device that emit a beam of coherent light through an optical amplification process

Here given data is

Energy = time × power

Energy = 25 ×  30

Energy = 750 J

Photons = 7.5 x 10²⁰

We have to calculate wavelength = ?

Then the formula is E =hcλ where E = energy, h = plank constant, c= speed, λ = wavelength

λ = hcE

λ = 6.62×10⁺³⁴×7.5 x 10²⁰ ×750 J

λ = 37×10⁻¹⁰ nm

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Answer:

222.2cm^2?

Explanation:

cos volume equals mass divided by density

Specific heat capacity of metal is the amount of heat that is required to raise the temperature of metal by 1 degree Celsius. The metals which has specific heat capacity of 0.449J/K/g is Iron. Thus correct option is option 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,

Enthalpy=mass of metal ×specific heat capacity of metal ×Change in temperature.

mass of metal= 10.0 g

change in temperature= 14.0° C =14K

specific heat capacity of metal=?

Q= enthalpy= 62.9 J

Substituting all the given values

specific heat capacity of metal= 62.9 J÷( 10.0 g × 14.0 K )

                                                 = 0.449J/K/g

Therefore the metals which has specific heat capacity of 0.449J/K/g is Iron. Thus correct option is option C

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ANSWER

The number of moles of water produced is 4.54 moles

EXPLANATION

Given that:

The mass of carbon dioxide is 100g

To find the moles of water, follow the steps below

Step 1: Calculate the moles of carbon dioxide using the formula below

Recall, that the molar mass of CO2 is 44.01 g/ mol

Step 2: Substitute the given data into the formula in step 1

Step 3: Find the moles of water produced using a stoichiometry ratio

In the reaction above, 1 mole of CO2 is equivalent to 2 moles of H2O

Let x represent the number of moles of water

Therefore, the number of moles of water produced is 4.54 moles

Answer:

0.08467 kg

Explanation:

1 cg = 10^-5 kg

so 8,467 x 10^-5 = 0.08467 kg

ANSWER

The usual oxidation state of lithium is +1

EXPLANATION

Lithium is a group 1 metal with an atomic number of 3. Its electronic configuration of lithium atom is written below as

In the above configuration, lithium has one electron in its outermost shell. Hence, the valence of electron is 1

During chemical reaction, lithium will lose an electron to attain it octet structure and it will attain the electronic configuration of Helium

Since it will be losing one electron, therefore it usual oxidation number is +1u

A sample of gas has an initial volume of 8.90 L at a pressure of 825 mmHg. If the volume of the gas is increased to 14.7 L, what is its pressure (in atm) is  0.65 atm.

According to boyle's law , we have

P1 V1  = P2 V2

P2 = (P1 V1 ) / V2

given that :

initial volume V1 = 8.90 L

pressure P1 = 825 mmHg = 1.08 atm

volume V2 = 14.7 L

solving the values in the formula , we get

P2 = (P1 V1 ) / V2

P2 = ( 1.08 × 8.90 ) / 14.7

P2 = 9.612 / 14.7

P2 = 0.65 atm

Thus, A sample of gas has an initial volume of 8.90 L at a pressure of 825 mmHg. If the volume of the gas is increased to 14.7 L,  its pressure in atm is  0.65 atm.

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The molar mass is 126.75 g/mol.

From the Periodic Table of Elements we can find the atomic mass of Fe and Cl:

- Fe atomic mass: 55.85 g/mol

- Cl atomic mass: 35.45 g/mol

So, the sum of their masses for a single FeCl2 molecule is:

1 Fe atom + 2 Cl atoms

1 x 55.85 g/mol + (2 x 35.45 g/mol)

55.85 g/mol + 70.9 g/mol

126.75 g/mol

So, the molar mass for a single FeCl2 molecule is 126.75 g/mol.

The relative atomic masses of the given elements are as follows:

Relative atomic mass is the sum of the product of the isotopic masses and the relative abundance of the isotopes of an element.

Relative atomic masses are averages.

The relative atomic masses of the given elements are calculated as follows:

1. Lead:

Relative atomic mass = (203.973 * 0.014) + (205.974 * 0.236) + (206.759 * 0.226) + (207.9766 * 0.523)

Relative atomic mass = 206.96 amu

2. Magnesium:

Relative atomic mass = (23.985 * 79.99) + (24.986 * 10%) + (25.983 * 11.01%)

Relative atomic mass = 24.62 amu

3. Silicon:

Relative atomic mass = (27.977 * 92.21%) + (28.976 * 4.70%) + (29.973 * 3.09%)

Relative atomic mass = 28.08 amu

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Answer:

6

Explanation:

Answer:

3. 175000 ml
5. 622 cl
7. 1570 ml
9. 440000 l
11. 327 kl
13. 204 kl
15. 8.943 cl
17. 696 kl
19. 287.000046 kl
23. 641 kl
25. 436000 l
Unfortunately, i couldn't read any other problems, only 3 through 25 (with 21 not being a problem)

Explanation:

The conversion units are:
1 ml = 1 ml
10 ml = 1 cl
100 ml = 1 dl (dl meaning deciliter)
1000 ml = 1 l
1 l = 1 l
10 l = 1 decaliter
100 l = 1 hl (hectoliter)
1000 l = 1 kl

For example, if i had 123 l and i wanted to convert it into ml. since 1 l equals 1000 ml, and 2 l equals two times 1000 ml would be 2000 ml, 123 l would equal 123 times 1000 ml which would be 123000 ml.

The mass of 2,301 grams of sodium in ounces is 0.0811757609 ounces.

The amount of sodium recommended by American heart association is 2301 mg. This limit should not be crossed in a day.

We have to convert Mass of sodium from mg to ounces.

We know,

1 ounce = 28.3459 grams.

We also know,

1 gram = 1000 milligrams.

So,

28.3459 grams = 28.3459 x 1000 milligrams.

28.3459 grams = 28345.9 milligrams.

1 ounce = 28345.9 mg.

1 mg = 1/28345.9 ounces

Weight of sodium 2301mg in ounces,

2301mg = 2301/28345.9 ounces

Dividing till last significant figure,

2301 mg = 0.0811757609 ounces.

Mass of sodium in ounces is 0.0811757609.

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17.28 moles of  Cl atoms are present in 4.32 moles of CC14.

we have given data in the statement

4 Cl atoms in CC14.

then moles of Cl in CC14 =  4.32×4 = 17.28 moles

The mole idea is a useful way to indicate how much of a substance there is. Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. The unit of measurement that receives the most attention is the "mole," which is a count of a sizable number of particles.

Popularly known as the Avogadro constant, the quantity 6.02214076*10^23 is frequently represented by the letter "NA". Atoms, molecules, monoatomic and polyatomic ions, as well as other particles, are examples of the elementary entities that can be represented in moles (such as electrons).

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Answer:

It's function is to remove wastes from the body

Explanation:

These wastes include water, carbon dioxide, nitrogen, salts, and heat. Metabolism: The process of the body converting food into energy. As a result, there are waste products.

The pressure (in mmHg) of O₂, given that CO₂ has a pressure of 560 torr is 222.8 mmHg

We'll begin by converting 1.03 atm to torr. This can be obtained as follow:

1 atm = 760 torr

Therefore,

1.03 atm = (1.03 atm × 760 torr) / 1 atm

1.03 atm = 782.8 torr

Next, we shall determine the pressure of O₂. This can e obtained as follow:

Total pressure = pressure of CO₂ + pressure of O₂

782.8 = 560 + pressure of O₂

Collect like terms

Pressure of O₂ = 782.8 - 560

Pressure of O₂ = 222.8 torr

Finally, we shall convert 222.8 torr to mmHg. This is illustrated below

Recall

760 torr = 760 mmHg

Therefore,

222.8 torr = 222.8 mmHg

Thus, we can conclude that the pressure of O₂ is 222.8 mmHg

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In Methane, we have 1 carbon atom combining with 4 hydrogen atoms.

It can also be said as

1 mole C + 4 mole of H = CH₄

These atoms combine together to give us 1 mole of CH₄

In the question given, we have 1 mole of carbon and 4 moles of hydrogen.

However, the equation for the formation of CH₄ is quite different as it is formed by hydrogenation of ethyne or ethene.

The above equation are some of the known ways to which methane is formed.

From the explanation above, we have 1 atom of C and 4 atoms of H

Ag⁺, Fe³⁺, and Co²⁺ react with ammonia to generate the complex ion when ammonia is added to the mixture.

The following actions could be taken in order to separate the three cations:

Precipitation of the silver ion as the insoluble silver chloride salt is the initial stage in the separation of these three cations. The addition of hydrochloric acid is all that is necessary to produce this precipitate.

Ag⁺ (aq) + HCl (aq)  ⇄ AgCl (s, white) + H⁺ (aq)  .... (eq. 1)

By centrifuging the test tube and separating the supernatant, the silver can then be distinguished from the other two cations because neither iron (III) nor cobalt (II) can produce an insoluble chloride salt. The precipitate that is still in the test tube is next tested to determine if there is silver present. The silver (I) complex dissolves after the addition of ammonia first.

AgCl (s) + 2 NH₃ (aq)  ⇄ Ag(NH₃)₂⁺ (aq) + Cl⁻ (aq) ........(eq. 2)

Nitric acid will cause the ammonia, NH₃, to react with the acid, shifting the balance to the left and causing the silver ion to re-precipitate as silver chloride.

Fe³⁺ and Co2+ are both present in the supernatant that was previously decanted. The iron (III) ion forms an insoluble hydroxide and precipitates out of the solution when ammonia is added to the mixture.

Fe³⁺ (aq) + 3 NH₃ (aq) + 3 H₂O (l) ⇄  Fe(OH)₃ (s) + 3 NH₄ ⁺ (aq) ........(eq. 3)

Fe(OH)₃ is left as a solid after centrifugation and decantation, and it can be dissolved with hot hydrochloric acid. You will carry out each of the two iron (III) confirmation tests. If Fe³⁺ is present in the first, adding potassium thiocyanate solution results in a red-brown color.

Fe³⁺(aq) + SCN⁻ (aq) ⇄  Fe(SCN)₂⁺ (aq, red-brown) ........(eq. 4)

In the second test, potassium ferrocyanide, K₄[Fe(CN)₆] solution is added after adding ammonia until the solution is only marginally acidic. Prussian blue is a dye that is a solid dark blue color when iron (III) is present.

4 Fe³⁺ (aq) + 3 K₄[Fe(CN)₆] (aq) ⇄  Fe₄[Fe(CN)₆]₃ (s, blue) + 12 K⁺ .......(eq. 5)

Some blue inks contain this chemical suspended in a solution.

A straightforward test can establish the cobalt ion's existence in the decanted supernatant solution. Hydrochloric acid is added to the basic solution to make it significantly more acidic. When potassium nitrite, KNO₂, is added, potassium hexanitritocobaltate, an insoluble yellow chemical, is created (III).

Co²⁺ (aq) + 7 NO₂⁻(aq) + 3 K⁺ (aq) + 2 H⁺ (aq) → NO (g) + H₂O (l) + K3[Co(NO2)6] (s, yellow) ........(eq. 6)

Nitric oxide, or NO, a colorless gas, is created via the reaction in Eq. 6. Nitrogen dioxide, also known as NO₂, is created when nitric oxide and oxygen in the air react. NO₂ can be seen as a red-brown gas.

2 NO (g, colorless) + O₂ (g) → 2 NO₂ (g, red-brown) ........(eq. 7)

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INFORMATION:

We know that:

- Sodium azide, NaN3, decomposes according to the following equation 2NaN3(s) → 2Na(s) + 3N2(g)

- We have an 45.0L airbag at 25°C and a pressure of 809 torr

And we must find how many grams of sodium azide are needed to inflate the airbag

STEP BY STEP EXPLANATION:

To find it, we need to use the Ideal Gas Law formula PV = nRT

Where,

P = pressure

V = volume

n = number of moles

T = temperature

R = gas constant

Is given that;

P = 809 torr

V = 45.0L

n = we need to calculate it

T = 25°C, converting to K, 25 °C + 273.15 = 298.15 K

R = 62.36 (L*torr)/(mol*K)

Now, replacing in the formula,

Now, solving for n

Now, using that molar mass of NaN3 = 65.02 g/mol, we can calculate the grams

Then, 127.3092 g are needed to inflate the airbag.

ANSWER:

127.3092 grams are needed to inflate the airbag.

EXPLANATION

What are indicators; Chemical indicators are a substance that gives a visible sign of the presence or absence of a required concentration of a chemical substance.

Examples of indicators are; litmus paper, methyl orange, phenolphthalein

Answer:

Na2SO4

Explanation:

Na+ has +1 charge

(SO4)-2 has -2 charge

so it takes 2 Na+ to balance 1 (SO4)-2

therefore Na2SO4

Answer 2:

Therefore, Earth is in two types of motion-

Answer 3:

Answer 4:

Answer 5:

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Answer:

A compound is a distinct group of atoms held together by chemical bonds. ... As we will now see, there are a variety of different ways to represent and draw

Explanation:

The mass of water produced when 6.26g of butane reacts with excess of oxygen will be 9.78g.

According to given question, the reaction would be:

C₄H₁₀ + 13/2O₂ --- 4CO₂ + 5H₂O

6.26g 0 0

As we know,

(mole of C₄H₁₀)÷coefficient = (mole of H₂O)÷coefficient

6.26/molecular weight ÷ 1 = mass of H₂O/molecular weight ÷ 5

6.26÷58 = Mass of H₂O/18×5

Mass of H₂O = 9.78g

Therefore, the mass of water produced when 6.26gram of butane reacts in the presence of excess of oxygen will be 9.78gram.

The combustion of butane is a reaction between butane and oxygen gas that leads to the production of carbon dioxide gas and water. This hydrocarbon combustion reaction releases heat energy and is an example of an exothermic reaction.

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Both superficial and deep infiltration of water into the soil are possible. The soil receives the moisture it needs from shallow penetration to maintain the plants and trees mentioned above. Additionally, shallow infiltration may penetrate the soil and enter lakes and rivers further downstream.

After precipitation, water can enter the water cycle through two different processes: runoff and infiltration. Infiltration is water that seeps into the soil, whereas runoff is water that flows across the land's surface. Large amounts of water are moved via runoff across the Earth's surface, finally ending up in lakes and oceans.

The process of evaporation turns liquid water into gaseous water (water vapor). Evaporation is how water gets from the surface of the Earth to the atmosphere. Evaporation results from the dissolution of the bonds holding the water molecules together as a result of heat energy.

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Answer:

A. 0.49 g/cm3

B. Yes

Explanation:

Volume of wood = 3 x 6 x 9 = 162 cm3

d = m/V = 80.0/162 = 0.49382716049 = 0.49 g/cm3

Since density of water is 1 g/cm3, density of wood is less so it will float in water.

ANSWER

The number of moles of CO2 is 2.69 moles

EXPLANATION

Given that;

The mass of CO2 is 118.6 grams

Follow the steps below

The molar mass of CO2 is 44.01 g/mol

Therefore, the number of moles of CO2 is 2.69 moles