Classify each substance as an atomic element, molecular element, molecular compound, or ionic compound.

Answer:

D) It tells what fraction of a radioactive sample remains after acertain length of time.

Explanation:

The correct answers to the problem given above about germanium IV oxide are as follows:

GeO₂ is a chemical compound also known as germanium oxide, germanium dioxide or germanium IV oxide. It is a polar covalent which is a soluble substance to some extent.

In conclusion, it can be deduced from the explanation given above that germanium IV oxide is a chemical compound.

The complete lewis structure of germanium IV oxide is attached.

Complete question:

Answer the following questions about germanium IV oxide, GeO₂

a. Determine its lewis structure.

b. Its bonding pairs/lone pairs

c. What is its electron geometry (GeO₂)?

d. Its shape (GeO₂)?

e. Is germanium IV oxide a polar or non-polar molecule?

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Use equation: (C=m/V). Now, the known concentration of copper(ll) ion solution and a colorimeter to produce a cu(ll) ion conc./absorbance calibration curve. you will be able to read its conc. from the curve.

A titration is a technique in which a solution of known concentration is used to determine the concentration of an unknown solution. The titrant (the known solution) is added from a buret to a known quantity of the analyte (the unknown solution) until the reaction is complete.

A calibration curve is a way to identify the concentration of an unknown compound. These curves use data points of known compounds at varying concentrations, and researchers or developers can use these curves to find where an unknown substance plots.

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Weather is created by differences in air pressure and temperature and moisture.

Six main factors make up the weather. These include the following: temperature, atmospheric pressure, the development of clouds, wind, and precipitation. A minor modification to any of these elements may result in a new weather pattern. Every variation in the weather has a cascading effect that affects everyone on the planet.

The sun only warms half of Earth at a time, leaving the other side in shadow. As a result, the sun heats the surface of the Earth unevenly each day, heating some areas more than others. Winds, clouds, and precipitation are all brought on by these temperature differences.

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The right answer is E.

The decarboxylation of pyruvate to acetyl-CoA and the production of NADH and CO2 are irreversible reactions that are catalyzed by the multi-enzyme complex known as pyruvate dehydrogenase. Pyruvate is introduced into the TCA cycle through the complex.

Two regulatory enzymes, three catalytic enzymes, and a binding protein make up the enzyme complex. There are three enzymes:

1. Thiamine pyrophosphate (TPP) is used as the prosthetic group by pyruvate dehydrogenase (E1).

2. Dihydrolipoyl transacetylase (E2), which has as its prosthetic groups coenzyme A and lipoamide.

3. Nicotinamide adenine dinucleotide (NAD+) and flavin adenine dinucleotide (FAD) serve as cofactors for dihydrolipoyl dehydrogenase (E3).

Hence, The correct response is option E since E2 needs coenzyme A as one of its co-factors.

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To complete the octet, the chlorine atom acquires one electron in the outermost shell. A negative charged chloride ion is created when an electron is added.

Valence shell refers to the outermost shell around an atom. The electrons found in this shell, which is the atom's outermost one, are known as valence electrons. - The number of an atom's outermost electrons is hence its valency.

In physics and chemistry, an electron is just a particle that is a component of the outer shell of an atom. The electron configuration can participate in the creation of a chemical bond if the the outside is open. an element's atom's capacity to form chemical bonds. Valence electrons: The electrons in the outermost shell are referred to as valence electrons.

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They shouldn't have made a choice based on the frozen metals because scientific research is based on accepted procedures, not on personal bias.

Briefing:

A researcher that is biased is unable to look at experimental observations objectively before drawing any conclusions. Bias is the biggest trap that needs to be avoided when performing a scientific investigation.

When there is a discrepancy between the observation and interpretation of data in a scientific investigation, a bias is introduced.

In the instance of this inquiry, the researchers were already interested in determining whether it was possible to obtain a fuel without carbon. They reached a lobe-sided, unscientific conclusion because they forgot to fully study the chunks of frozen metal since their brains were so clouded by this bias.

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The compound that is formed from the combination of NH₄⁺ and SO₃²⁻ is (NH₄)₂SO₃ and the compound that is formed from the combination calcium ion and phosphate ion is Ca₃(PO₄)₂.

Definition of Ionic bond

A bond that is formed by the complete transfer of some electrons from one atom to another is known as an ionic bond. The atom which loses one or more electrons becomes a cation—a positively charged ion. The atom which gains one or more electron becomes an anion—a negatively charged ion.

The term "ionic bonding" is given "when the ionic character is greater than the covalent character".

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Part a

[tex]\text{pOH}=-\log(1.0 \times 10^{-3}})=\boxed{3}\\\\\text{pH}+\text{pOH}=14 \implies \text{pH}=\boxed{11}[/tex]

Part b

[tex]\text{pH}=-\log(1.0)=\boxed{0}\\\\\text{pOH}+\text{pH}=14 \implies \text{pOH}=\boxed{14}[/tex]

The enthalpy change for the following reaction is -318 kJ. Using bond energies, estimate the O-F bond energy in OF₂(g).

OF₂(g) + H₂O(g) -> O₂(g) + 2HF(g) is   190 kJ /mol.

The reaction is given as :

F - O - F  +  H - O - H ----->  O = O +  2H - F

                                           moles       bond energy

bond broken H - O                  2               463  kJ/mol

bond broken O - F                  2                 ?

bond form O = O                     1                  498 kJ/mol

broken form H - F                     2                 565 kJ/mol

enthalpy change =  BE ( bond broken ) - BE (bond form )

- 318                      = (2 (O - F) + 2(463) - (( 498 ) + 2( 565))

- 318 = 2 (O - F) - 698

2 (O - F) = 380

(O - F) = 190 kJ /mol

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The mass of phosphate ions are present in 25.8 g of tin (IV) phosphate is 13.3 g/mol.

An anion, salt, functional group, or ester produced from phosphoric acid is referred to as a phosphate in chemistry. Most frequently, it refers to orthophosphate, a product of orthophosphoric acid H 3PO 4. The elimination of three protons H+ results in the formation of the phosphate or orthophosphate ion [PO 4]3 from phosphoric acid.

Phosphate in excess can be harmful. It can impair the body's utilization of iron, calcium, magnesium, and zinc and result in diarrhea, calcification (hardening) of organs and soft tissue.

25.8 g of Sn₃(PO₄)₄

mol.wt of Sn₃(PO₄)₄ is 736.015

no. of mole of Sn₃(PO₄)₄= 25.8/736.015 moles

Sn₃(PO₄)₄ has 3 Sn⁴⁺ and 4(PO₄)³-

so, no. moles of (PO₄)³- = 4 * 0.0351

= 0.1402

mol.wt of (PO₄)³- is 95g/mol

mole = wt/ mol.wt

wt = 0.1402 *95

= 13.3 g/mol

Thus, The mass of phosphate ions are present in 25.8 g of tin (IV) phosphate is 13.3 g/mol.

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Answer:

The answer is A. II, III and IV

A gas is transported in a horizontal pipeline at a flow of 10.000 lb.„/min. If it is moving at 10 ft.'s, -6045 HP rate of work (in horsepower) must be performed on the gas to increase its velocity to 200 ft/s at the same temperature and pressure

This equation may be used to compute work: Work equals Force x Distance. The Newton metre is the SI unit for work (N.m). One joule is the amount of work done when one Newton of force pushes an item one metre.

Because the force transmits one unit of energy when it does one unit of work, the rate of accomplishing work equals the rate of utilising energy. A horsepower is equivalent to 550 foot pounds per second, while a kilowatt is equal to 1000 watts.

Given that,

A gas is transported in a horizontal pipeline at a flow of 10.000 lb/min

m = (10000÷60) lb/sec

m = 166.67 lb/sec

and, v₁ = 10 ft/sec

v₂ = 200 ft/sec

Now,

or, m [(v₂²  - v₁²)/2] = - w

or, w = m/2 × [(v₁²  - v₂²)]

or, w = 166.67/2 × [(10)² - (200)²]

or, w = -3325000 lb. ft².s⁻¹

or, w = -3325000 / 550 HP

or, w = -6045 HP

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The correct option is Br, Cl

What are halogens?

Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and Tennessee are the five or six chemically related elements that make up the halogens group in the periodic table (Ts). Group 17 is the name given to this group in the current IUPAC nomenclature.

The definition of "halogen" is "salt former" (or "salt maker"). Silver bromide, potassium iodide, calcium fluoride, and sodium chloride are just a few of the compounds that are created when halogens combine with metals.

There are other families of halogen oxides that are known to form various anions, including the one shown in the figure attached to the question but which I am unable to reproduce here.

Chlorine, bromine, and iodine frequently combine to create these anions. When the halogen's octet expands, these anions are created. This suggests that the halogen's outermost shell now has more than eight electrons.

Hence, Br and Cl are the correct option

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The maximum number of electrons  that can be associated with each of the following combinations of quantum numbers :

a) n = 7, l= 6  is 26 electrons

b) n = 4 , l = 3, ml = +3 is 2 electrons

The maximum number of the electrons in the given set of quantum numbers is given as follows :

a) n = 7 and l = 6

m = -l to + l

total values of m = 2l + 1

                           = 2 ( 6 ) + 1

                           = 13 values

that means we have 13 orbitals corresponding to the values of n = 7 and l = 6

so, the maximum number of electrons = 13 × 2

                                                                 = 26 electrons

b) n = 4, l = 3 and m = + 3

here the value of m is given, this means that we have uniquely identified an orbital. an orbital can have maximum two electrons.

therefore, the maximum number of the electrons = 2

The question is incomplete , the complete question is :

The maximum number of electrons  that can be associated with each of the following combinations of quantum numbers :

a) n = 7, l= 6  

b) n = 4 , l = 3, ml = +3

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Answer:

To find the density of a box, you will need to divide its mass by its volume. The density of an object is a measure of how much mass is contained in a given volume.

The volume of the box can be calculated by multiplying its length, width, and height:

volume = 2 cm x 4 cm x 10 cm = 80 cm^3

To find the density of the box, you will need to divide its mass by its volume:

density = mass / volume

= 120 g / 80 cm^3

= 1.5 g/cm^3

Therefore, the density of the box is 1.5 g/cm^3.

The mass of vinegar required to react with baking soda to produce 750 mL of CO₂ is 2.01 g.

The mass of vinegar required to produce 750 mL of CO₂ is calculated as follows:

Equation of reaction: CH₃COOH + NaHCO₃ ---> CH₃COONa + H₂O + CO₂

From the equation of the reaction, 1 mole of vinegar, CH₃COOH reacts with 1 mole of baking soda to produce 1 mole of CO₂.

Assuming the reaction takes place at STP conditions, the volume of 1 mole of CO₂ is 22400 mL.

Mooles of CO₂ in 750 mL will be 750 * 1 mol/22400 = 0.0335 moles

Moles of vinegar required will then be 0.0335 moles

Molar mass of vinegar = 60 g/mol

Mass of 0.0335 moles of vinegar will be 60 * 0.0335 moles = 2.01 g

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The wavelength is same.

Wavelength can be defined as the distance between two successive crests or throughs of a wave.

The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from  2 to 1.

A good starting point here will be to calculate the energy of the photon emitted when the electron falls from  1 to 2

by using the Rydberg equation.

1/π = R

λ

 si the wavelength of the emittted photon R

 is the Rydberg constant, equal to 1.907.

This means that you haveλ=

4.10

So, you know that when an electron falls from  

to  

a photon of wavelength  

410 nm

 is emitted. This implies that in order for the electron to jump from the 2 to 1

, it must absorb a photon of the same wavelength.

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The cellulosic ethanol cellulosic ethanol grain ethanol grain ethanol methane are considered biofuels. The two most common biofuels used today are ethanol and biodiesel.

Both of which are the  first generation biofuel technologies. The BETO is working with industry to develop next-generation biofuels from waste, the cellulosic biomass, and algae-based resources. Ethanol (often derived from corn in the United States and sugarcane in Brazil), biodiesel (derived from vegetable oils and liquid animal fats), green diesel (derived from algae and other plant sources), and the biogas are examples of the biofuels (methane derived from animal manure and other digested organic material).

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The toluene which sequence of reactions below works best to prepare the following cyclohexadiene compound is given as :

                 NBS , heat           NaOCH₃       Na, NH₃

Toluene  ------------------>   ----------------->    ------------>

                 CCl₄                    CH₃OH          CH₃OH

The substituted aromatic hydrocarbon is the toluene compound. . the cyclohexadiene is used as the initial material for the synthesis of the many natural complex products. the cyclohexadiene  can be formed by the toluene . the synthesis which is the best to prepare the cyclohexadiene  from the compound that is toluene is given as follows :

               NBS , heat           NaOCH₃       Na, NH₃

Toluene  ------------------>   ----------------->    ------------>

                 CCl₄                    CH₃OH          CH₃OH

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The organic phase is a solvent, usually dichloromethane or diethyl ether, that disperses very little in water. The 9-fluorenone was dried, isolated, and saltified with sodium sulfate.

There are a number of extraction processes, including solvent extraction, distillation, pressing, and sublimation, that can be used. Solvent extraction is the method that is most frequently used.

extracting liquid from liquid When a substance is "extracted," it is moved from a solid or liquid into a separate solvent or phase. The method most frequently used in chemical labs is liquid-liquid extraction, which takes place in a separatory funnel.

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Answer:the number of moles represented by 3.0 x 10^24 atoms of Ag is 0.500mol 0.500 m o l .

Explanation:

Answer:

1.43 x 10^24 molecules

Explanation:

Molecular mass of methane = 12.01 + 4(1.01) = 16.05 g/mol

so mol of 38.25 g equals 38.25g x (1 mole/16.05g = 2.38 mol

1 mole = 6.022 x 10^23 molecules

so 2.38 mol will have 2.38 x 6.022 x 10^23 = 1.43 x 10^24 molecules

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the mass in gram of 7.68 x 10²¹atoms of carbon is 0.152g.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

given number of atoms of carbon=7.68 x 10²¹atoms

Substituting the values

mole= =7.68 x 10²¹÷ 6.022×10²³

mole = 0.0127moles of carbon

number of moles of carbon=given mass of carbon÷ molar mass of carbon

Substituting the values

0.0127= mass of carbon÷12.01g

mass of carbon= 0.152g

Therefore, the mass in gram of 7.68 x 10²¹atoms of carbon is 0.152g.

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Pancreatic amylase is able to break down starches, but not lipids because enzymes bind only to their specific substrates.

Pancreatic amylase is the enzyme secreted by pancreas. One of the important features of all the types of enzymes is the substrate specificity. It ensures that enzyme perform the chemical reaction they are specifically intended to do.

We also see salivary amylase secretion in the mouth which begins the breakdown process of our food. It is again directed towards carbohydrates for instance starch. Lipids are digested by emulsification and proteins are digested by breakdown through peptidases.

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Answer:

The law of conservation of mass states that matter cannot be created or destroyed. If we have an unbalanced equation, atoms are either destroyed or created, which totally violates this law

The mass expressed in grams was 0 14750 g.

what is a gram?

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3.7*[tex]10^{-20}[/tex] J energy would be required to promote an electron from the n = 11 level to the n= 12 level.

According to particle in a box model energy is

E=[tex]\frac{n^{2} }{8ml^{2} } h^{2}[/tex] where n = no of energy level = 10

                          h is Planck constant, m is mass of electron= 9.1*[tex]10^{-31}[/tex]kg

and l is length of box= 140pm= 140*[tex]10^{-10}[/tex] m.

so E =3.7*[tex]10^{-20}[/tex]J.

What is particle in a box model?

The particle in a box model, sometimes referred to as the infinite potential well or the infinite square well, in quantum mechanics depicts a particle that is free to travel in a constrained area enclosed by impenetrable barriers.

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Answer:

Moving from one environment to another causes it to change