What is the molar mass of H3PO4? (Molar mass of H = 1. 0079 g/mol; P = 30. 974 g/mol; O = 15. 999 g/mol) (3 points) a 72. 98 g/mol b 78. 22 g/mol c 88. 24 g/mol d 97. 99 g/mol

According to the given question, the correct statement is "Work was done by the system," as the system performed work by using some of the heat gained to do work, resulting in the change in internal energy.
To solve this problem, we can use the first law of thermodynamics, which states:

ΔU = Q - W

where U is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the system gains 722 kJ of heat (Q = 722 kJ), and the change in internal energy is +211 kJ (U = 211 kJ). We need to find the work done (W).

Plugging in the values, we have:

211 kJ = 722 kJ - W

Now, rearrange the equation to solve for W:

W = 722 kJ - 211 kJ

W = 511 kJ

So, the work done is 511 kJ. Since W is positive, this means work was done by the system.

In conclusion, 511 kJ of work is done by the system.

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Answer:

To draw the partial orbital picture of CH2 (singlet methylene carbene) and include p-orbital, lone pair orbital, three-dimensional geometry, and hybridization, follow these steps:

1. Draw the carbon atom at the center, with two hydrogen atoms bonded to it in a V-shape. This indicates the molecule has a bent structure.

2. For hybridization, the carbon atom is sp2 hybridized. This means that one s-orbital and two p-orbitals on the carbon atom have mixed to form three sp2 orbitals.

3. Arrange the three sp2 hybrid orbitals in a trigonal planar geometry around the carbon atom, with bond angles of approximately 120 degrees. Connect one sp2 orbital to each hydrogen atom, and one sp2 orbital will have a lone pair of electrons.

4. The remaining p-orbital on the carbon atom, which is perpendicular to the plane of the molecule, will be unhybridized and empty.

So, the partial orbital picture of CH2 (singlet methylene carbene) shows a carbon atom with a bent geometry, sp2 hybridization, and an empty p-orbital perpendicular to the plane of the molecule. The carbon atom is bonded to two hydrogen atoms, and there is a lone pair of electrons in one of the sp2 orbitals.

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The attributes of the genetic code include all of the following except B. Each codon specifies more than one amino acid.

A. Each codon consists of 3 nucleotides: This is a correct attribute of the genetic code. Codons are made up of three consecutive nucleotides, which form the basic unit of the genetic code.

B. Each codon specifies more than one amino acid: This is incorrect. Each codon typically specifies only one amino acid. However, there are some exceptions called "ambiguous codons" where a single codon can code for more than one amino acid, but they are relatively rare.

C. Codons are non-overlapping: This is a correct attribute of the genetic code. Codons are read sequentially and are not overlapping. Each codon starts at a specific position in the DNA or mRNA sequence.

D. Most amino acids are specified by more than one codon: This is a correct attribute of the genetic code. With a few exceptions, most amino acids are encoded by multiple codons. This redundancy provides some level of error tolerance and allows for variations in the DNA sequence without affecting the encoded protein.

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The equation of the function for the given graph is y=(x−5)²+3

The given graph is a parabola which is a plane curve and is approximately U– Formed. A parabola may be a conic area that's obtained when the proper circular cone surface and plane cross. In other words, a parabola may be a locus of focus in a plane surface that ought to be equidistant from the locus and the directrix.

In the graph, we can see the vertex which is  (5,3). The formula we are referring for  the vertex form of a parabola with vertex (h,k) is

y=a(x−h)²+k

So for this graph, it will be ( h=5 and k=3)

y=a(x−5)²+3

As we substitute the desired value of x and y  in order to find a-

=> 12=a(8−5)²+3

=> a(3)² =9

=> 9a =9

Therefore the value of a =1

And the equation will be y=(x−5)²+3

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Answer:

i looked it up its slinky waves

Explanation:

Answer:

diffracted

Explanation:

Sure it might look like a slinky but if you're talking about waves then it's deffinetly diffracted hope this helps

Buffers are solutions that can withstand a pH change, even when a strong acid or base is added. The human body is an intricate system that must maintain a balanced environment in order to function properly. Buffers are critical in the maintenance of homeostasis, which is the balance of bodily functions.

Buffers have a number of mechanisms that allow them to maintain a consistent pH, which helps to keep a body system's overall pH constant. This includes reacting to excess acid or base, as well as neutralizing harmful substances by creating a reaction that results in a balanced pH.

The primary way a buffer helps to maintain homeostasis is by maintaining a consistent pH. This is important because changes in pH can have a significant impact on cellular function. For example, pH levels that are too high or too low can impact the way enzymes function. This can impact the ability of cells to carry out vital functions that are necessary for life.

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A pH buffer, such as the bicarbonate system in the human body, helps maintain homeostasis by absorbing excess hydrogen or hydroxide ions to prevent drastic changes in pH levels. Antacids are a non-biological example of buffers. The regulation of acid and base concentrations, measured via the pH scale, is critical for proper physiological functioning.

A pH buffer helps maintain homeostasis in the body by preventing radical changes in the pH level of body fluids. An example of a buffer system that maintains homeostasis is the bicarbonate system in the human body. This buffering system absorbs excess hydrogen or hydroxide ions to prevent drastic increases or decreases in pH. When the pH of body fluid decreases below 7.35, the bicarbonate buffer, acting as a weak base, binds to the excess hydrogen ions. On the other hand, if the pH level rises above 7.45, the buffer acts as a weak acid and contributes hydrogen ions.

Antacids, over-the-counter medicines for heartburn, are common examples of buffers outside of the biological system. These antacids absorb hydrogen ions and help moderate the pH level, alleviating heartburn symptoms. The physiological functioning of our body depends on maintaining a balanced ratio of acids and bases, measured using the pH scale, which buffers aid to regulate.

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To prevent more than one sperm from entering the egg.

What is oocyte?

An oocyte , or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis, forming oogonia. During oogenesis, the oogonia become primary oocytes. An oocyte is a form of genetic material that can be collected for cryoconservation.

When the sperm and egg fuse it triggers a release of calcium ions, which cause the cortical granules inside the egg to fuse with the plasma membrane. As they fuse, these granules release their contents outside of the cell, toward the remains of the zona pellucida.

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Answer:

A system can be either closed or open: A closed system is a system that is completely isolated from its environment.

An open system is a system that has flows of information, energy, and/or matter between the system and its environment, and which adapts to the exchange.

The formal charge on the oxygen atom in N2O is +1.

The correct answer is 1.

To determine the formal charge on the oxygen atom in N2O, we need to assign formal charges to each atom in the molecule.

The formula for calculating the formal charge is:

Formal Charge = Valence Electrons - Non-bonding electrons - (1/2) * Bonding electrons

For oxygen (O) in N2O, we have:

Valence Electrons = 6 (since oxygen is in Group 16)

Non-bonding electrons = 4 (oxygen has two lone pairs)

Bonding electrons = 2 (oxygen forms a double bond with nitrogen)

Plugging these values into the formula, we get:

Formal Charge = 6 - 4 - (1/2) * 2

= 6 - 4 - 1

= 1

Therefore, the formal charge on the oxygen atom in N2O is +1.

The correct answer is 1.

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Answer:

Explanation:

initial velocity, u = 0

final velocity, v = 30 m/s

time, t = 8 sec

acceleration, a = v - u / t

= 30 - 0 / 8

= 30 / 8

= 3.75 m/s^2

Hope this helps

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Answer:

its C

Explanation:

Answer:

Calcium chloride does not have a covalent bond , it is an ionic bond (which means donation of electrons takes place ). The charge of calcium ions is +2, while the charge of sodium ions is -1. The molecule of calcium chloride contains one calcium ion (+2) and two chloride ions (-1), resulting in an overall charge of 0, or neutral.

IONIC BONDING IN CALCIUM CHLORIDE \((CaCl_2)\)

Electron sharing produces covalent compounds, while electron donation produces ionic compounds. \(CaCl_2\) is a salt with an ionic bond. This is because calcium takes up an electron to each of the chlorine atoms, resulting in \(Ca^2^+\)ions for calcium and\(Cl^-\) ions for chlorine. At room temperature, it behaves like a normal ionic halide and is solid. Calcium is a metal with a non-metal sulphate bond.

Thus , Calcium chloride have ionic bonds present on them . No covalent bonds takes place in calcium chloride.

Answer:

Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is  in fact true of every element located under oxygen in the periodic table.

P.S. hope this helps :)

Answer:

C) the study of the composition of the atom.

Explanation:

A research can be defined as a systematic investigation or careful consideration of study with respect to a particular problem using scientific methods such as collection of data, documenting critical information, analysis of data, and the establishment of facts in order to reach new conclusions.

Similarly, a basic research is an approach to research that's typically theoritical and it's aimed at developing a theory, searching for the truth or gain a better understanding about a phenomenon, subject, or basic laws on nature.

In this context, an example of basic research is the study of the composition of the atom.

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such determines or defines the structure of a chemical element.

Generally, atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.

To determine the value of ∆Hrxn for the reaction, we can use the equation:

∆Hrxn = q / n

where q is the heat of the reaction, n is the number of moles of reactants, and ∆Hrxn is the change in enthalpy of the reaction.

We can use the equation for calculating heat:

q = mc∆T

where q is the heat, m is the mass of the solution, c is the specific heat of the substance, and ∆T is the change in temperature.

The mass of the solution is equal to the volume of the solution times the density:

m = V * d

Plugging this equation into the equation for calculating heat, we get:

q = (V * d) * c * ∆T

We can use the values given in the problem to solve for q:

q = (0.200 L * 1.00 g/mL) * (4.18 J/g°C) * (23.48°C - 22.15°C)

q = 4.32 J

To determine the value of ∆Hrxn, we need to know the number of moles of reactants. The concentration of the HCl solution is 0.2 M, so the number of moles of HCl is:

n = (0.200 L) * (0.200 mol/L) = 0.040 mol

Plugging this value into the equation for ∆Hrxn, we get:

∆Hrxn = q / n = (4.32 J) / (0.040 mol) = 108 J/mol

Therefore,  ∆Hrxn=108 J/mol

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A decrease in pH means a rise in positively charged H+ ions, and a rise in the electrical gradient across the membrane. The transport of amino acids into the cell will increase.

How do amino acids move across the cell membrane?

The amino acids are diffused across the cell wall by facilitated diffusion with the help of symporter proteins present in the plasma membrane. These also are called sodium-dependent amino acid transporters.

What do the cells do with the amino acids?

The gastrointestinal system breaks all proteins down into their amino acids so that they can enter the bloodstream. Cells then use the amino acids as building blocks to create enzymes and structural proteins.

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Answer: plastic

Explanation:

The thermal conductivity of a material is highly depending on composition and structure. Generally speaking dense material such as medals and stone are good conductors of heat while load density substances such as gas and porous installations are poor conductors of heat

Answer:

Or plastic

Explanation:

May be useful................

Answer:

The elements in group 18 are ureactive compared to the elements in group 17.

The elements in group 17 are called the halogens. They are highly reactive nonmetals and hardly occur in free state in nature. They contain seven valence electrons in their outermost shell and are highly electronegative.

The elements in group 18 are unreactive because they have an already filled outermost shell. They are very different from the halogens even though they occur side by side. They occur side by side because they have eight valence electrons and the halogens have seven valence electrons. Recall that elements in the same group have the same number of valence electrons.

They are not Chemically similar at all in any wise. The elements in group 17 and 18 are mostly gases held together by dispersion forces.

Explanation:

The final volume of the sample is approximately 5.01 L.

By giving the reactants of the reaction hydrogens or electrons, reducing agents aid in the reduction process. Diborane is therefore another source of hydrogens that is present. In various processes involving organic chemicals, it serves as a reducing agent. This is how diborane is structured. Boron and hydrogen are the main components of this colourless chemical. Tetrahedral geometry describes it.

P1V1/T1 = P2V2/T2

Plugging in the given values, we get:

345 torr * 3.48 L / 258.15 K = 468 torr * V2 / 309.15 K

Simplifying and solving for V2, we get:

V2 = (345 torr * 3.48 L * 309.15 K) / (468 torr * 258.15 K)

V2 ≈ 5.01 L

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the mass of the second isotope is 157.4amu.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

Substituting the given values

128.4amu=(  114.3 amu × 64.23%)+(M amu × 35.7%)

128.4=73.3+(M amu × 35.7)

55.1=M amu × 0.35

M amu =157.4amu

Therefore, the mass of the second isotope is 157.4amu.

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Answer:

C

Explanation:

I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably

Answer:

Explanation:

Answer:

D

Explanation:

molecules have potential energy and kinetic energy.

Tempreture is defined as the average kinetic energy and internal energy is PE+KE. Pptential energy in particles or molecules is just there position relative to one another. A gas which has seperated particles will have a greater potential energy than a solid/liquid.

Answer:

409g

Explanation:

Relation formulas

64.5g of Cu gives 216g of Silver

122g of Cu gives Xg of Silver

X = 409g

Answer: Thus, the heating element becomes hot and glows red. On the other hand, the cords are made up of good conductors like copper. They have low resistance, and do not produce much heat when same amount of current is passed through it. Hence, the cord does not glow.

Explanation:

Answer:

Explanation: Thus, the heating element becomes hot and glows red. On the other hand, the cords are made up of good conductors like copper. They have low resistance and do not produce much heat when the same amount of current is passed through them. Hence, the cord does not glow.