why do we count skeletal electron pairs (sep) 1 to determine the shape of a cluster? group of answer choices a.sep 1 reflects the total number of electrons in the cluster b.sep 1 reflects the number of orbitals need for bonding c.sep 1 is an arbitrary way of defining a cluster d.sep 1 reflects the number of 2-center-2-electron bonds

Answer:

What question?

Explanation:

Answer:

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If a carbohydrate, like xylulose, has five carbon atoms and a carbonyl group on the second carbon, it is called a(n) keto pentose.

These consist of glycogen, cellulose, as well as starch. Benedict's reagent can be used as a test to see if there are lots of simple carbohydrates present. When it interacts with lowering sugars, it changes from turquoise to yellow or orange. These contain unbound aldehyde but rather ketone groups in simple carbohydrates.

Sugars and starches are examples of carbohydrates. They contain carbon, hydrogen, and oxygen, which appear in the ratio 1:2:1. Size-based categories for carbohydrates include monosaccharides, disaccharides, or polysaccharides. Carbohydrates act as sources of power as their main purpose.

Therefore, If a carbohydrate, like xylulose, has five carbon atoms and a carbonyl group on the second carbon, it is called a(n) keto pentose.

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The mass of copper metal obtained from this process is 483 tons.

To calculate the mass of copper metal obtained from the given copper ore, we need to use the percentage composition and the mass of the ore processed.

1. Calculate the mass of Cu2S in the ore:

Since the ore contains 2.30% Cu2S by mass, we can calculate the mass of Cu2S in 21000 tons of ore:

mass of Cu2S = (2.30/100) × 21000 tons

2. Calculate the molar mass of Cu2S:

Copper (Cu) has a molar mass of approximately 63.55 g/mol, and sulfur (S) has a molar mass of approximately 32.07 g/mol. The molar mass of Cu2S can be calculated as:

molar mass of Cu2S = (2 × molar mass of Cu) + molar mass of S

3. Calculate the moles of Cu2S:

Using the mass of Cu2S and its molar mass, we can calculate the number of moles of Cu2S:

moles of Cu2S = mass of Cu2S / molar mass of Cu2S

4. Calculate the moles of copper (Cu):

Since each formula unit of Cu2S contains 2 moles of copper (Cu), the moles of copper can be calculated as:

moles of Cu = 2 × moles of Cu2S

5. Calculate the mass of copper (Cu):

The mass of copper can be calculated by multiplying the moles of copper by its molar mass:

mass of Cu = moles of Cu × molar mass of Cu

Finally, convert the mass of copper from grams to tons by dividing by 1000:

mass of Cu (in tons) = mass of Cu / 1000

Performing these calculations will provide the mass of copper metal obtained from the given ore in tons.

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The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties. The elements are arranged in rows, called periods, and columns, called groups or families. The number of periods on the periodic table varies depending on the classification system used.

In the most common version of the periodic table, there are seven periods. This version is based on the modern electron configuration notation and is used in most chemistry textbooks and classrooms. The seven periods are numbered 1 through 7 and correspond to the increasing number of electron shells in the atoms of the elements. Period 1 contains the elements with one electron shell, period 2 contains the elements with two electron shells, and so on. The elements in each period have similar chemical and physical properties, and their properties change as you move from left to right across the period.

However, there are other versions of the periodic table, such as the extended periodic table, in which there are nine periods. This version is based on the older notation of electron shells, which used letters to represent the different electron shells (K, L, M, N, etc.).

In the extended periodic table, period 7 is further divided into periods 7A and 7B, and period 8 is further divided into periods 8A and 8B. This is done to accommodate the elements with high atomic numbers, such as elements 104-118, which were discovered after the development of the seven-period table. The elements in these additional periods have similar chemical and physical properties, but they are less stable and less common than the elements in the first seven periods.

In summary, the number of periods on the periodic table can be either 7 or 9, depending on the classification system used. The most common version of the periodic table has 7 periods, but an extended version with 9 periods is also used to accommodate the elements with high atomic numbers.

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Answer:

d. Each substance in a mixture keeps most of its characteristic properties

Explanation:

Compound is formed by the fixed composition of two or more substances while mixture is formed by the different composition of two or more substances.

Compound and mixture are different from each other as each substances in mixture shows its own properties while compounds shows a different new properties.

Hence, the correct answer is "d".

Answer:

it's 8

Explanation:

the last group of the periodic table is group 8. so all elements in a group should have the same number of valency electrons

Answer: 3.240576

Explanation:

There are various ways of doing multiplication this is one of them

The wording "keep in mind the rules for significant digits" implies that we are to use these to show where the decimal place goes by approximating the answer. Then conducting the exact calculation.

Consider 0.8 as 8  

×

1

10

3

×

8

×

1

10

=

2.4

So the solution is some where a bit above 2.4

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Lets just use the numbers

Multiply both 0.8439 and 3.84 by 1000 to get rid of the decimal place. This makes thing more straight forward. So we end up with:

8439

×

38400

Split up the 38400 into 30000+ 8000 + 400

30000

×

8439

=

253170000

.

8000

×

8439

=

.

67512000

.

.

400

×

8439

=

.

.

3375600

−−−−−−−−−  

←

Add

.

324057600

By our approximation we are expecting the form of

2.4

+

small amount

So the answer is  

3.240576

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Check by calculator:  

0.8439

×

3.84

=

3.240576

Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

Answer:

There are 0.5 mole in 20g of argon.

Explanation:

40 g of argon = 1mole

Then 20g of argon is,

→ 1/40 × 20

→ 0.5 mole

Answer:

\(n = \frac{mass}{molar \: mass} \\ n = \frac{20g}{39.948 \frac{g}{mol} } \\ n = 0.5 \: mol \: of \: argon\)

Explanation:

hope this makes sense

:)

24.22 g of ethyl butyrate would be produced from 15.6 g of butanoic acid and excess ethanol using the more efficient catalyst.

The balanced equation for the reaction of butanoic acid and ethanol to produce ethyl butyrate is:

C4H9COOH + C2H5OH → C6H12O2 + H2O

The molar mass of butanoic acid is 88.11 g/mol. Thus,

15.6 g of butanoic acid is equivalent to 15.6 g/mol ÷ 88.11 g/mol = 0.177 mol of butanoic acid.

Based on the balanced equation, 1 mol of butanoic acid reacts with 1 mol of ethanol to produce 1 mol of ethyl butyrate. Hence, 0.177 mol of butanoic acid reacts with 0.177 mol of ethanol to produce 0.177 mol of ethyl butyrate. To calculate the theoretical yield of ethyl butyrate, we need to determine the number of moles of ethyl butyrate produced. The molar mass of ethyl butyrate is 144.21 g/mol. Hence, the number of moles of ethyl butyrate produced is:

0.177 mol × (1 mol ethyl butyrate ÷ 1 mol butanoic acid) × (144.21 g/mol ethyl butyrate) = 25.59 g ethyl butyrate.

Therefore, the theoretical yield of ethyl butyrate is 25.59 g. The catalyst increases the yield of ethyl butyrate to 94.6%. Hence, the actual yield of ethyl butyrate is:

Actual yield = 94.6% × theoretical yield= 0.946 × 25.59 g= 24.22 g

Therefore, 24.22 g of ethyl butyrate would be produced from 15.6 g of butanoic acid and excess ethanol using the more efficient catalyst.

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Ionic bonds are a type of bond formed with the attraction between oppositely charged ions to form a chemical compound, this type of bond will have a transfer of electrons, from the positively charged ion (cation) to the negatively charged ion (anion). Since this type of bonding heavily depend on the electronegativity of the elements, we will have compounds formed with metals, located more to the left in the periodic table, mostly group 1 and 2, and with nonmetals, more to the right in the periodic table, one example of this type of bond is Chlorine (nonmetal anion) and Lithium (metal cation).

Covalent bonds are a type of bond formed with the sharing of electrons between two elements with no big difference in their electronegativity, usually, we will see nonmetals in this type of bond, since their difference in electronegativity is not as relevant as the difference between metals and nonmetals, one example of this type of chemical bond is Nitrogen and Oxygen, 2 nonmetals that can bond together.

Metallic bond, as the name suggest, is a type of bond that will strictly involve metals and not nonmetals, this type of bond has many properties but the low electronegativity in general is one of these properties, one example for this bond is Gold and Gold

Therefore the answers are:

Gold and Gold = metallic

Nitrogen and Oxygen = covalent

Chlorine and Lithium = ionic

The following nuclear equation isn't balanced because the atomic number or subscript of element is not correct as it is meant to be 97.

This is referred to as an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

This is referred to an alpha nuclear reaction due to the presence of helium atom as the product.in this scenario, addition of the superscript and subscript on the reactant and product side will give the accurate value. This therefore means that 95+2 = 97 will make the equation balanced.

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12 electrons are transferred in this reaction when 15 g of iron react.

A chemical reaction is described as a process that leads to the chemical transformation of one set of chemical substances to another

The balanced chemical equation for the reaction between iron and oxygen is:

4 Fe + 3 O2 → 2 Fe2O3

The iron has a +3 oxidation state and the oxygen has a -2 oxidation state as products.

There are 4 iron atoms and 6 oxygen atoms in this reaction and if we multiply the oxidation state of each ion by the quantity of each gives us the number of electrons transferred.

Iron gives up (4)*(3) = 12 electrons and oxygen takes (6)*(2) = 12 electrons

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Answer:

it will float if the object is 1g/cm^3(water 's density ) because it is less dense

The mass of 6.12 moles of arsenic (As) is calculated to be approximately 459g.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by multiplying the number of moles of a substance by its molar mass. That is;

Mass of Arsenic = no. of moles of As × molar mass of As.

According to this question, 6.12 moles of arsenic was given and its molar mass is 74.92g/mol.

Mass of As = 6.12 mol × 74.92g/mol

Mass of As = 459g

Therefore, the mass of 6.12 moles of arsenic (As) is calculated to be approximately 459g.

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Answer:

459g

Explanation:

I took the test

In a methyl tert-butyl ether sample that contains 69.0 moles of hydrogen, there are 5.75 moles of oxygen.

Methyl tertiary-butyl ether (MTBE), also known as methyl tert-butyl ether and tert-butyl methyl ether, is an organic chemical with the structural formula (CH3)3COCH3. MTBE is a colorless, flammable liquid that is only weakly soluble in water. MTBE is primarily a fuel additive that is mixed with gasoline to improve knock resistance and cut back on unwelcome emissions.

Methanol and isobutylene combine chemically to produce MTBE. Natural gas, especially methane, contains a variety of light hydrocarbons that steam reforming can transform into carbon monoxide and hydrogen. The resultant gases then continue to react in the presence of a catalyst to produce methanol. There are numerous ways to make isobutylene.

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Answer:  " \(1.41 * 10^{24}\) " atoms of aluminum (Al) .

____________________________________

Explanation:

_________________________

Using a technique called "dimensional analysis" ; as follows:

________________________

→  " \(\frac{2.34 mol Al}{1} * \frac{6.022*10^{23}atoms Al}{1 mol Al} = ?\)  

________________________

The units "mol Al" ["moles of aluminum"] cancel out; and we have:

________________________

→  "\([(2.34) * (6.022 * 10^{23})] = ?\) atoms of Al [aluminum].

________________________

Note that by definition: 1 (one) "mole" (abbreviated "mol") of anything consists of " \(6.022*10^{23}\) " units " of that particular thing.

 This number:  6.022*10^{23} —is known as:  "Avogadro's number".

________________________

→  [ 2.34 * 6.022 * 10^23] ;

     = 1.409148 * 10^24 ;

                → Round to 3 (Three) significant figures;

                →  since: "2.34" has 3 (Three) significant figures;

                  →  to get: " \(1.41 *10^{24}\)  atoms of aluminum (Al).

________________________

Hope this is helpful to you!  Wishing you the best!

________________________

The species that act as acid are the ones that donates H⁺ in the reaction.

Since we are working with an equilibrium, we have to consider both directions.

From left to right, we have H₂O turning into OH⁻ because it lost one H⁺, so H₂O is acting as an acid in the forward reaction.

From right to left, we have CH₃NH₃⁺ tunrning into CH₃NH₂ because it lost one H⁺, so CH₃NH₃⁺ is acting as an acid in the backwards reaction.

So, the species that act as acids are H₂O and CH₃NH₃⁺, I and II only.

A second-order extension of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations serves as the foundation for the density functional based tight binding (DFTB) approach.

What is DFTB method?

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Binding energy per nucleοn (BE) = (-0.02793 amu * c²) / 32 = -0.04789 MeV/nucleοn (rοunded tο fοur significant figures)

Tο calculate the mass defect and nuclear binding energy per nucleοn fοr the given nuclides, we'll need tο use the fοllοwing fοrmulas:

Mass defect (Δm) = (Atοmic mass οf the nucleus) - (Sum οf the masses οf its individual prοtοns and neutrοns)

Nuclear binding energy per nucleοn (BE) = (Tοtal binding energy οf the nucleus) / (Tοtal number οf nucleοns)

Given atοmic masses:

Part A: O-16 atοmic mass = 15.994915 amu

Part C: Ni-58 atοmic mass = 57.935346 amu

Part E: S-32 atοmic mass = 31.97207 amu

Let's calculate the values fοr each part:

Part A: O-16

Number οf prοtοns (Z) = 8

Number οf neutrοns (N) = 16 - 8 = 8

Tοtal number οf nucleοns (A) = Z + N = 8 + 8 = 16

Mass defect (Δm) = (15.994915 amu) - (16 amu) = -0.005085 amu (rοunded tο five decimal places)

Binding energy per nucleοn (BE) = (-0.005085 amu * c²) / 16 = -0.008994 MeV/nucleοn (rοunded tο fοur significant figures)

Part C: Ni-58

Number οf prοtοns (Z) = 28

Number οf neutrοns (N) = 58 - 28 = 30

Tοtal number οf nucleοns (A) = Z + N = 28 + 30 = 58

Mass defect (Δm) = (57.935346 amu) - (58 amu) = -0.064654 amu (rοunded tο five decimal places)

Binding energy per nucleοn (BE) = (-0.064654 amu * c²) / 58 = -0.1111 MeV/nucleοn (rοunded tο fοur significant figures)

Part E: S-32

Number οf prοtοns (Z) = 16

Number οf neutrοns (N) = 32 - 16 = 16

Tοtal number οf nucleοns (A) = Z + N = 16 + 16 = 32

Mass defect (Δm) = (31.97207 amu) - (32 amu) = -0.02793 amu (rοunded tο five decimal places)

Binding energy per nucleοn (BE) = (-0.02793 amu * c²) / 32 = -0.04789 MeV/nucleοn (rοunded tο fοur significant figures)

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Answer:

To calculate the percent yield, we need to divide the actual yield (250 L) by the theoretical yield (in liters) and then multiply by 100%.

Percent Yield = (actual yield / theoretical yield) x 100%

So, if we know the theoretical yield of CO2 in liters and we want to calculate the percent yield of 250L of CO2 collected as the actual yield, we need to insert the theoretical yield in the equation.

For example, let's assume that the theoretical yield of CO2 is 350L.

Percent Yield = (250 L / 350 L) x 100% = 71.42%

This is close to option A) 72%. So, The percent yield of 250L of CO2 collected for the actual yield is 72%

Keep in mind that this is a theoretical example and the actual yield percentage will vary depending on the reaction and the experimental conditions.

Explanation:

Answer:

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Answer:

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Explanation:

As pressure rises, more gas molecules dissolve. At two atmospheres, nitrogen gas is twice as soluble as it is at one atmosphere. A gas becomes less soluble as pressure is reduced.

At 4.25 atm compared to 1.00 atm, the concentration of gas particles in the solution is greater.

Pressure and solubility relationship

Since a gas becomes more soluble as pressure rises, there is a direct correlation between solubility and pressure. The solubility of a gas increases with increasing pressure because of an increase in molecular collision, and reduces with decreasing pressure due to an increase in molecular collision.

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Answer:

I am pretty sure Danny Duncan told me 69

Explanation:

niice

Question 24:

Answer C : Q is placed in group 13 and period 2.

Question 25:

Answer C : II and IV.

Question 26:

Answer D

☁️ Answer ☁️

Option 1: When dissolved, sugar molecules have more opportunities to bond with positive-negative water molecules. Therefore, sugar dissolves faster than salt, because its component molecules are more soluble in water.

❤️

Option 2: Sugar can dissolve easier than salt because when you add 8 spoons of salt into water the salt already starts to stay in the bottom of the cup. And, when you add 30 spoons into water the sugar just starts to stay in the bottom of the cup. It’s almost the same.

Hope it helps.

Have a nice day!~ ￣▽￣❤️