Which of the following choices is not an example of artificial selection?
Scientists genetically alter watermelon to produce a seedless variety.
Scientists cross a plum and an apricot to produce a new variety of fruit, a pluot.
Farmers use genetic engineering to create larger ears of corn.
A blue-eyed man and a brown-eyed woman have two children, both of whom have brown eyes.

The chemical formula is AB3X, A occupies all the corners & B occupies the faces, So the contribution = ½ × 6 = 3 . X occupies body center So contribution= 1,So atomic formula= AB3X

What is Chemical formula?

A chemical formula is a way of presenting information about the chemical ratios of atoms that make up a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes other symbols such as parentheses, dashes, parentheses, commas, and plus and minus signs

What is chemical compound?

A chemical compound is a chemical substance composed of two or more different chemical elements held together by chemical bonds. It can be either a molecular compound composed of atoms held together by covalent bonds, or an ionic compound composed of ions held together by ionic bonds. Compounds can be composed of elements from the same group, or from different groups.

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4.2 moles of PO4 contains 399g of PO4

As, Atomic mass of PO4 = 31g + 64g = 95g

1 mole of PO4 contains --> 95g of PO4

4.2 mole of PO4 contains --> 399g of PO 4

Based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

From the equation of NaHCO3 → Na₂CO3 + H₂O + CO₂ , we have

Mass of baking soda = 2 x molar mass

Molar mass of NaHCO₃ = 84.007 g/mole

Mass of baking soda = 2 x 84.007 g/mole

Mass of baking soda =  168.014 g/mole=  168 g/mole

Therefore, based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.

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Surface water and ground water are two sources of watershed. Thus, option A is correct,

A watershed is an area of land and water where water from many sources collects at a location below the surface of the land. The area of land that surrounds a water source and empties into a single location at a lower elevation is called the watershed.

Surface water is defined as water from rivers, oceans, etc. that is on the same level as the land. Groundwater is the liquid that lies below the surface of the earth or the sea.

For instance, the geographical area that drains into a lake's watershed would include include the streams that enter the lake as well as the streams' final destination, the lake. Large watersheds that include the watersheds of numerous smaller rivers and streams are referred to as drainage basins.

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N3- (nitride ion) is the molecule or ion that will exhibit delocalized bonding.

Delocalized bonding occurs when electrons are distributed over more than one atom in a molecule or ion. It is a type of bonding that is different from the traditional localized bonding, where electrons are associated with specific atoms. Delocalized electrons can move freely across the entire molecule or ion, making it more stable and less reactive.The Nitride ion (N3-), is an example of a molecule that exhibits delocalized bonding. In N3-, the electrons from the three nitrogen atoms are delocalized, creating a stable and less reactive species.

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H2O2 (hydrogen peroxide) is the reagent to look out for because as seen below it turns:

- Ends of alkenes with 1 –H = Aldehydes but Carboxylic Acids instead

I is the element which is oxidized in the given reaction. Therefore, the correct option is option A.

An atom, ion, or molecule undergoes oxidation when one of its electrons is lost or its oxidation status is raised. It can be identified by the oxidation number of an element rising, the removal of hydrogen, the loss of electrons, or the addition of oxygen.

[tex]\rm I^- + MnO_4^- + H^+ \rightarrow I_2 + MnO_2 + H_2O[/tex]

Oxidation state on reactant side are:

The oxidation state of the iodide ion ([tex]\rm I^-[/tex]) is 1.

The oxidation state of the permanganate ion ([tex]\rm MnO_4^-[/tex]) is +7.

The oxidation state of the hydrogen ion ([tex]\rm H^+[/tex]) is 1.

Oxidation state on product side are:

Iodine ([tex]\rm I_2[/tex]) has an elemental state with oxidation state 0.

With an oxidation state of +4, manganese dioxide ([tex]\rm MnO_2[/tex]) is a metal.

The oxidation state of water ([tex]\rm H_2O[/tex]) is -2 for oxygen and +1 for hydrogen.

Iodine has undergone oxidation because its oxidation state went from -1 to 0.

Therefore, the correct option is option A.

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The 38.945 kJ/mol is the activation energy .

What is moles ?

The mole, denoted by the sign "mol," is the volume of a system that has the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.  Similar to how having a dozen eggs says you have twelve eggs, having a mole of something indicates that you have 602,214,076,000,000,000,000,000 of that particular thing.

What is activation energy ?

Even simply getting started takes some energy from them. This force is referred to as activation energy. An automobile engine, for instance, requires activation energy to start. When the key is turned, a spark is produced, starting the engine's burning of gasoline.

It is found that in a chemical reaction, rate constant of the reaction nearly doubled with the rise in temperature by every 10 degree. The temperature dependence  of the rate constant can be explained by Arrhenius equation.

k = A e-Ea /RT

where k = rate constant

A = Arrhenius factor

Ea = Activation energy in Joule/mole

R = Universal gas constant

T = Temperature in Kelvin

Taking natural logaritham

ln k = -Ea / RT + lnA [ lnAB = lnA+ lnB & ln ex = x]

Let k1 and k2 be the rate constants at temperatures T1 and T2 respectively,

then,

ln k1 = -Ea /RT1 + lnA --------------(1)

ln k2 = -Ea /RT2 + lnA --------------(2)

Subtracting (1) from (2)

lnk2- ln k1 = -Ea / R x [ (1/T2 ) - (1/T1)]

ln(k2/k1) = Ea/R x [ (1/T1)- (T2)]-------- [ lnA - lnB = ln(A/B)]

log (k2/k1) =Ea / 2.303R x [ T2- T1 / T1T2] ----- [ natural logarithm can be converted to common logarithm by multiplying with 2.303]

Here T1= 255K

T2 = 265 K

T2- T1 = 265K - 255K

= 10 K

Here the rise in temperature is 10 degree, so the rate constant is to be doubled

That is   k2 = 2 k1

or k2/k1 = 2

R = 8.314 J K-1mol -1

Substituting the values,

log 2= Ea / 2.303x 8.314 x[ 10/255x265]

0.3010= Ea / 19.147 x 10/ 67575 [log 2= 0.3010]

Ea = (0.3010 x19.147x67575) / 10

=38945 Joules/mol

or

Ea = 38.945 kJ/mol

Thus activation energy (Ea) of 38.945kJ/mol is required to double the rate constant for the given reaction

Therefore, 38.945 kJ/mol is the activation energy .

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In general, the solubility of compounds containing the carboxylic acid group (COOH) can be increased by reacting a carboxylic acid with sodium hydroxide option - b is correct answer.

Water does not form dimers when carboxylic acids are added. Instead, hydrogen bonds are created between the water molecules and the individual acid molecules. These interactions allow for the dissolution of carboxylic acids to create acidic solutions in water.

Similar to alcohols, aldehydes, and ketones, carboxylic acids are soluble in water. Acids with fewer than five carbons dissolve in water, but those with a higher molecular weight are insoluble because their larger hydrocarbon portion is hydrophobic.

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Answer:

you are a monkey JK

melanin is DARK SIR

Explanation:

heheh

With regard to the current understanding of atom structure, that planet best captures the model.

A chemical element's atom is a particular type of particle of substance. A positively charged electron or many negatively charged electrons encircle the central nucleus of an atom. Protons and neutrons, two relatively hefty particles that make up the positively charged nucleus, may be present.

We have chosen to abandon Atom in order to enhance our dedication to bringing quick and dependable application development to the cloud using Microsoft's Visual Code and GitHub Codespaces, even though the goal of expanding the software maker community still exists.

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The balanced half-reactions for the oxidation and reduction in the reaction 2Fe + 3[tex]I_2[/tex] → 2[tex]Fe_3[/tex] + 6[tex]I^-[/tex] are Fe(s) → [tex]Fe^{3+}[/tex](aq) + 3[tex]e^-[/tex] and 3[tex]I_2[/tex](s) + 6e → 6[tex]I^-[/tex](aq) respectively.

The balanced half-reactions for the oxidation and reduction that happen in the reaction 2Fe + 3[tex]I_2[/tex] → 2[tex]Fe^{3+}[/tex] + 6[tex]I^-[/tex] are as follows:

Oxidation half-reaction (Fe → [tex]Fe^{3+}[/tex]):

Fe(s) → [tex]Fe^{3+}[/tex](aq) + 3[tex]e^-[/tex]

Reduction half-reaction (I2 → I^-):

3[tex]I_2[/tex](s) + 6e → 6[tex]I^-[/tex](aq)

The oxidation half-reaction describes the oxidation of iron (Fe) to iron(III) ion ([tex]Fe^{3+}[/tex]). In this process, Fe loses 3 electrons, becoming [tex]Fe^{3+}[/tex].

The reduction half-reaction describes the reduction of iodine ([tex]I_2[/tex]) to iodine ions ([tex]I^-[/tex]). In this process, iodine gains 6 electrons, becoming [tex]I^-[/tex].

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Only when the masses of the reactants and products are equal can a chemical reaction occur.

Product mass is equal to reactant mass. The term "moles" should be inserted between each coefficient and formula so that the equation can be read in "moles." An equation's "mole-mole factor" is the ratio of the moles of any two substances.

A chemical reaction can only take place if the mass of the reactants and products are equal. Therefore, if you start with a specific mass and it interacts, the products will have the same mass.

Examine what transpires when the chemical splits into smaller, more recognizable products like water, carbon dioxide, or any of the gaseous elements in order to forecast the outcomes of such a reaction. Synthesis reactions frequently happen when pure elements are mixed.

The complete question is:

An experiment will start with 15g of carbon and 75g of oxygen. What is the predicted mass of the product?

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The expression for the solubility product constant for Cr₂(CO₃)₃ is

Ksp = [Cr³⁺] [CO₃⁻²]³

The equilibrium constant for the dissolution of a solid substance in an aqueous solution is the solubility product constant, Ksp. The amount that a solute dissolves in solution is what it represents. A substance's Ksp value increases with its degree of solubility.

The solubility product, also known as K s p, is a physical quantity. When a solid material dissolves in a liquid or aqueous solution, it serves as the equilibrium constant for equations.

Cr₂(CO₃)₃ → 2Cr³⁺(aq) + 3CO₃⁻²(aq)

Ksp = [Cr³⁺] [CO₃⁻²]³

Solubility product constant is product of concentrations of ions formed and power on concentration is stoichiometry coefficient.

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Answer:

Explanation:

Damien Gilley. ... Leandro Erlich. ... Tang Yau Hoong. ... Erik Johansson. ... Julian Beever. ...

3.115 moles of hydrogen were produced when 6.23 moles of Li were combined. Utilizing 80.57 grams of Li, 11.60 grams of hydrogen were produced.

Hydrogen is most frequently found in water on earth. The hydrogen atoms in each hydrogen atom (H2 O) total two. On the surface of the earth, hydrogen can also be found in a variety of compounds, such as molecules, acids, and hydroxides.

Hydrogen retail costs ranged from $8.50/kg to $10.80/kg more than gasoline prices in 2021 for hybrid or traditional gasoline vehicles, respectively, matching a same gasoline cost per mile. Since hydrogen has been utilized in industry for more than 80 years, it is highly developed.

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Alpine glaciers create or widen valleys by ejecting dirt and other objects in their path. Aside from Australia, they are spread across every landmass in high piles.

What kind of landmass is that?

An landmass is a group of land that is typically divided by an ocean, causeway, or canal. America and Latin America, which are divided by a canal, are two examples of landmasses. It is possible to extend this brief article about a location or feature.

What is the world's largest landmass?

The largest continent, Asia, runs from the western Pacific Ocean to the eastern Mediterranean Sea. Asia is home to more than 40 nations. China, India, and Indonesia are a few of the most populous nations on the planet.

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The question in a investigation is the problem that we are asked to find and the hypothesis states what we thinks the answer to that question.

In a scientific experiment, the problem on which we work to solve or the question addressing an unknown thing is called a scientific question. The scientific question have to be precise and experientable.

A scientific hypothesis is a predictive statement describing the possible answer of the problem under study based on the observations and some previous scientific reports.

A hypothesis must be rectifiable, testable and falsifiable. We are checking whether our hypothesis is true or false through an experiment. Hence, second option is correct.

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A total of 373.7 grams of the combination should be made up of 254.7 grams of water and 119 grams of CaCl2.

In physics, mass is a way to numerically express inertia, a fundamental property of all matter. In essence, a body of matter is the resistance it provides to a change in its speed or position brought on by the application of a force. The more mass a body has, the smaller the change that a force causes is.

One of a body's essential properties is its mass. It was commonly believed to be related to the quantity of matter in a physical body before to the discovery of the atom and the science of particle physics.

Since the solution contains 32.0% CaCl2 by mass, we may calculate the mass of CaCl2 by multiplying the total mass by 32.0(35%).

0.320 x  373.7 = 119.584g =  119 g CaCl2

Simply deduct the amount of CaCl2 from the total mass to determine the mass of H2O:

mass H2O = 373.7 g - 119 g = 254.7g H2O

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At room temperature and ordinary atmospheric pressure, the density of a gas is normally stated in g/L or g/mL, atmospheric pressures are typically expressed in atm or Pa, and [tex]\rm F_2[/tex] and [tex]\rm Br_2[/tex] are likely to be gases.

The density of a substance is a measure of how much mass it has in a given volume.

Part A: The density of a gas is typically reported in g/L or g/mL. These units express the mass of the gas per unit volume.

Part B: Atmospheric pressures are typically expressed in atm or Pa (pascals). These units measure the force exerted by the atmosphere per unit area.

Part C: [tex]\rm F_2[/tex] and [tex]\rm Br_2[/tex] are both likely to be gases at room temperature and ordinary atmospheric pressure, as they are both diatomic molecules with low boiling points.

Therefore, the density of a gas is typically reported in g/L or g/mL, atmospheric pressures are typically expressed in atm or Pa, and [tex]\rm F_2[/tex] and [tex]\rm Br_2[/tex]are likely to be gases at room temperature and ordinary atmospheric pressure.

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Your question is incomplete but most probably your full question was,

Part A: In what forms are you more likely to see the density of a gas reported? Select all that apply. g/L, g/cm2, g/mL and kg/cm3

Part B: Which units are appropriate for expressing atmospheric pressures? Select all that apply. atm, N, Pa and kg/m2.

Part C: Which is most likely to be a gas at room temperature and ordinary atmospheric pressure? Select all that apply. [tex]\rm F_2, Br_2, H_2O\ and\ K_2O[/tex]

The statement that tells the most important factor that allows cells to keep accomplishing their many processes is A. Cells constantly produce usable energy in the form of ATP

ATP (adenosine triphosphate) is the primary energy currency of cells. It is used to power the many chemical reactions that take place within cells, including things like muscle contraction, nerve impulse conduction, cell growth and division, and the transport of molecules across cell membranes. Without a constant supply of ATP, cells would not be able to carry out these processes and would quickly die.

The combination of genes from two individuals resulting in genetic variation is also important, but it is more related to the diversity of living organisms and its evolution than to the basic functions of the cells.

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2 – C2H6 and HCN O 4 contain at least one pi bond.

Molecules are the smallest unit of any chemical element or compound that has the properties of that substance. They are made up of atoms bonded together in various combinations, and have a definite chemical structure and composition. Molecules can be made up of single atoms, such as oxygen (O2), or of different types of atoms, such as water (H2O). Molecules are the building blocks of all matter, and are the basis of all living and non-living things.

C2Cl4 and Cl2CO do not contain any pi bonds. Pi bonds are formed by the overlap of atomic orbitals between two atoms. C2H6 and HCN O 4 contain double bonds between the atoms, which are made up of pi bonds. C2Cl4 and Cl2CO do not have any double bonds, so they do not contain any pi bonds.

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3 is the number of the following molecules contain at least one pi bond.

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1. 2SO2 + 2H2 ➡️ 2H2S + 2H20

2. CaCl2 + Na2CO3 ➡️ CaCO3 + 2NaCl

3. 2HNO3 ➡️ NO2 + H2O + 02

4. 12Al + H2SO4 ➡️ A12(SO4)3 + H2

The gold sphere has a radius of 92893 cm³. The mass of the sphere is 1.7 × 10⁶ g which is equal to 3585 pounds.

Density of an object is the measure of its mass per unit volume. It describes how closely its particles are packed.  Density is the ratio of mass to the volume.

Gold is dense solid with a density of 19.3 g/cm³.

radius of the sphere = 28.1 cm

Volume of the sphere = 4/3 πr³

V  = 4/3 π (28.1 cm³) = 92893 cm³

Mass of the sphere = volume × density

                                 = 92893 cm³ × 19.3 g/cm³

                                 = 1.7 × 10⁶ g

1 g = 0.02 pounds

then 1.7 × 10⁶ g = 1.7 × 10⁶ × 0.022 = 3585 pounds

Therefore, the mass of the sphere is 3585 pounds.

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There are 11 protons in an isotope of sodium with the mass number of 25.

Atoms with same number of protons but different numbers of neutrons are called as isotopes. They share almost the same chemical properties, but have different masses and therefore physical properties.

Isotopes are atoms belonging to same element, having same atomic number Z, but different mass number A. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of element carbon with mass numbers as 12, 13 and 14 respectively. How do you identify an isotope?

Generally, isotopes are specified by the name or symbol of the particular element and immediately followed by a hyphen and mass number.

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Covalent bond is a bond which is formed by the sharing of electrons between the two atoms.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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The average rate of change of B from t=0 s to t=262 s is -0.00114 M/s

To determine the average rate of change of B, we need to calculate the change in B over the given time interval (0 to 262 seconds), and then divide by the time interval.

A = 2B

Therefore, B = A/2

At t = 0s, B = .720/2 = .360 M

At t = 262s, B = .120/2 = .060 M

The change in B is thus:

change in B = B(t=262s) - B(t=0s) = .060 - .360 = -.300 M

The average rate of change of B over the time interval from t = 0s to t = 262s is:

average rate of change = change in B / time interval = (-.300 M) / (262 s - 0 s) = -.300 M/262 s = -0.00114 M/s

So the average rate of change of B from t=0 s to t=262 s is -0.00114 M/s

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Protium, an isotope of hydrogen, contains the hydrogen atom (H1). An interstellar cloud called the H I region.

Community of British NVC H1, an area of health. An isotope of hydrogen, the hydrogen atom (H1) protium, is present. In the interstellar medium, a cloud called the H I zone. CTA code H01 Anatomical Therapeutic Chemical Classification System subclass: Pituitary and hypothalamic hormones and analogues.

Water and organic compounds are two examples of molecules that contain the majority of the hydrogen that exists on Earth. One proton, one electron, and no neutrons are present in each atom of the most prevalent isotope of hydrogen (symbol 1H).

It is officially referred to as protium because this isotope's nucleus only contains one proton. Hydrogen-1 is regarded as a stable isotope because the proton's decay has never been detected.

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Answer:

D

Explanation:

yurr