what is a band gap? the band gap is what is a band gap?the band gap is a major factor that determines the strength of bonds in a solid. a distance between the nuclei of atoms in a solid. a major factor that determines the electrical conductivity of an atom. an energy gap that exists between the valence band and conduction band.

A compound is found to contain 43.64 % phosphorus and 56.36 % oxygen by weight The molecular weight for this compound is 283.88 g/mol. is the molecular formula for this compound is P₂O₅.

Given that :

mass of the oxygen = 56.36 %

molar mass of the oxygen = 16 g /mol

moles of the oxygen= mass / molar mass

                                          = 56.36 / 16

                                          = 3.52 mol

mass of the phosphorus = 43.64 %

molar mass of the phosphorus = 31 g/mol

moles of the phosphorus = 43.64 / 31

                                         = 1.41 mol

dividing by the smallest one :

moles of the phosphorus = 1 = 2

moles of the oxygen = 2.5 = 5

The molecular formula is P₂O₅.

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Rainwater is affecting the parts of earth's surface that contain rocks through what is referred to as physical weathering.

This is also referred to as mechanical weathering and it is the process in which is the disintegration of rocks and minerals without any chemical change being experienced and the major agents of this type of weathering are water and wind.

Rainwater seeps into parts of the earth surface which contains rocks and weaken it which leads to it breaking into smaller particles as time goes thereby resulting in the formation of soil etc. This is therefore the effect rainwater has on rocky part of the earth surface.

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Answer:

Explanation:

q..

Ionic bonds are not formed between iodine and chlorine as the electronegativity difference is  between iodine and chlorine too low  for an ionic bond to form.

Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.For an ionic bond to form it is essential that there be a large difference in electronegativities of the two atoms.

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Answer:

There are many opportunities a chemist, chemical engineer, and molecular biologist may have. These professions and or practices could become Product Development Scientists, a Clinical Pharmacist, a Biochemist, or a Pharmaceutical Administer. These careers are very important, because people with professions in these areas will be able to get well paying jobs that will most likely have increasing value over time.

Schools need to offer chemistry so people seeking jobs in these areas will be able to do what they love, and for those who are seeking other science related professions like becoming nurses and other important members in the work force, will be able to get the education they need. Chemistry is a college level class, and is a college credit. If you're not seeking a higher profession in the scientific area, you can take it to get a required credit out of the way.

There are a plethora of science jobs out there that are crucial to the wellbeing of people, and these jobs will ALWAYS be important.

This isn't five minutes... but I hope this helps a little. Add a lil' bit more, and you should be good. I really hope this helped.

Answer:

=32×1632×√1632=34√2.

Explanation:

Answer: B is the answer

Explanation:I just answered

Rearrangements are rare with tertiary alcohols but not with secondary or primary alcohols due to the increased stability of the carbocation intermediate formed during the reaction.

In the synthesis of t-Butyl Chloride, the reaction involves the conversion of t-butyl alcohol (a tertiary alcohol) to t-butyl chloride. During this reaction, the alcohol molecule undergoes a nucleophilic substitution reaction where the hydroxyl group is replaced by a chlorine atom. In this process, the alcohol molecule is converted into a carbocation intermediate before the chloride ion attacks to form the final product.

The rarity of rearrangements with tertiary alcohols can be attributed to the increased stability of the carbocation intermediate formed. Tertiary carbocations are more stable compared to secondary or primary carbocations due to the presence of three alkyl groups which provide electron-donating effects and stabilize the positive charge.

The stability of the carbocation reduces the likelihood of rearrangement reactions, where the carbon skeleton is rearranged to form a more stable carbocation intermediate. In contrast, secondary and primary carbocations are less stable and more prone to rearrangements.

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The law that states that the volume of a gas is directly proportional to the number of moles of gas at constant temperature and pressure is known as Avogadro's Law.

Avogadro's Law states that the volume of a gas is directly proportional to the number of moles of gas at constant temperature and pressure. This law was first proposed by Amedeo Avogadro, an Italian scientist, in 1811. According to this law, if the amount of gas in a container is increased while the temperature and pressure remain constant, the volume of the gas will also increase in proportion to the number of moles of gas present. Conversely, if the amount of gas is decreased, the volume will also decrease proportionally. Avogadro's Law is based on the fact that the number of gas molecules in a given volume of gas is directly proportional to the number of moles of gas present. This law is an important concept in the study of gases and is used in many areas of science, including chemistry, physics, and engineering. It is also essential in the development of the ideal gas law, which describes the behavior of gases under various conditions.

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The irreversibility in the process can be calculated as the difference between the actual entropy change and the reversible entropy change at the final equilibrium temperature: Irreversibility = ΔS_actual - R * ln(V_f/V_i) - cp * ln(T_f/T_i)

To determine the irreversibility in the process, we can use the concept of entropy change. The irreversibility in a process can be calculated as the difference between the actual entropy change and the reversible entropy change.

The reversible entropy change can be calculated using the ideal gas equation:

ΔS_rev = R * ln(V_f/V_i) + cp * ln(T_f/T_i)

where:

ΔS_rev is the reversible entropy change

R is the specific gas constant (8.314 J/mol·K)

V_f and V_i are the final and initial volumes, respectively

T_f and T_i are the final and initial temperatures, respectively

cp is the specific heat capacity at constant pressure

Given:

Volume of each region = 500 liters = 0.5 m^3

Initial pressure in region 1 = 1 MPa = 1,000,000 Pa

Initial temperature in region 1 = 350ºC = 623 K

Initial pressure in region 2 = 4 MPa = 4,000,000 Pa

Initial temperature in region 2 = 150ºC = 423 K

Final temperature in equilibrium = 100ºC = 373 K

Temperature of the medium = 25ºC = 298 K

First, let's calculate the reversible entropy change for each region using the given equations:

ΔS_rev_1 = R * ln(V_f/V_i) + cp * ln(T_f/T_i)

ΔS_rev_2 = R * ln(V_f/V_i) + cp * ln(T_f/T_i)

Substituting the given values and using the specific heat capacity of hydrogen (cp = 14.307 J/mol·K), we can calculate ΔS_rev_1 and ΔS_rev_2.

Next, we need to calculate the actual entropy change for the process, which is the sum of the reversible entropy changes of both regions:

ΔS_actual = ΔS_rev_1 + ΔS_rev_2

Finally, the irreversibility in the process can be calculated as the difference between the actual entropy change and the reversible entropy change at the final equilibrium temperature:

Irreversibility = ΔS_actual - R * ln(V_f/V_i) - cp * ln(T_f/T_i)

Substituting the calculated values, we can determine the irreversibility in kW.

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Answer:

3s^1 would be 3s^2

Explanation:

Reversible protein phosphorylation controls the activity, structure, and cellular localization of many types of proteins. Protein kinases add a phosphoryl group to proteins while protein phosphatases remove them.

The amino acids that are able to be phosphorylated are the hydroxyl-containing side chains of serine, threonine, and tyrosine. The covalent addition of a phosphate group to an amino acid side chain can effect conformational change of a protein in three general ways:

1. Charge change: The negatively charged phosphate group will change the electrostatic properties of the amino acid side chain to which it is attached, thus disrupting salt bridges, and charge interactions that stabilize the protein's native conformation.

2. Steric hindrance: The addition of a phosphate group increases the size of the amino acid side chain, which can create steric hindrance. This can introduce a kink or bend in the polypeptide chain that leads to conformational changes of the protein.

3. Hydrogen bonding: The addition of a phosphate group to an amino acid side chain can introduce a hydrogen-bonding group into the protein structure.

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Answer:

80.667

Explanation:

math

Answer:

When carbon is heated in air, it reacts with oxygen to form carbon dioxide. As the carbon reacts with oxygen to form carbon dioxide, the mass of the carbon decreases while the mass of the oxygen and carbon dioxide increases.

Answer:

When carbon is heated in air, it undergoes a process known as combustion or burning. During this process, carbon reacts with oxygen present in the air, resulting in the production of carbon dioxide gas. This reaction causes the carbon atoms to be lost in the form of carbon dioxide molecules. Hence, the original mass of carbon decreases due to the formation of lighter carbon dioxide molecules that are released into the atmosphere. Overall, the burning of carbon in air results in a reduction in its mass.

Without doing any calculations, solubility would inform Lev that he can store more gas at a depth of 400 kpa than 300 kpa.

Solubility is the maximum amount of a substance that can dissolve in a given amount of solvent under specific conditions of temperature and pressure. In other words, solubility refers to the ability of a substance (the solute) to dissolve in another substance (the solvent) to form a homogeneous mixture (the solution).

At higher pressures, the solubility of carbon dioxide gas in water increases, which means that more carbon dioxide can be dissolved in the ocean water at 400 kPa compared to 300 kPa. Therefore, the amount of gas that can be stored would be higher at 4000 meters depth where the pressure is 400 kPa than at 3000 meters depth where the pressure is 300 kPa.

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Answer:

The blanks can be completed with words in the following sequence

1) elements

compound

2) atom

3) matter

4) compound

5) chemistry

6) reactants

product

Explanation:

In H2SO4, atoms of hydrogen, sulphur and oxygen represent different elements that are combined to form the compound.

The smallest indivisible unit of matter that still retains all the properties of matter is an atom. Matter is anything that has weight and occupy space.

Atoms combine in fixed ratios to form compounds. Chemistry studies matter scientifically and pays specific attention to the changes that matter undergoes.

Considering the reaction of photosynthesis, water and carbon dioxide combine to give glucose so the water and carbon dioxide  are reactants while the glucose is the product of the reaction.

Answer: (although the question does not sate whether if you separate them physically or through energy. so i did both)

1. can be separated (When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen)

2. can be separated, but through electrolysis, fiscally moving a crane to generate electricity to separate the molecules

3. Most solid particles, composed of diamagnetic or weak paramagnetic materials, cannot be extracted by a conventional magnetic separator. physically cannot be separated. but through heat yes

4. but there is a catch: doing so requires energy. ... If energy from coal were applied to drive the decomposition reaction, more CO2 would be released than consumed, because no process is perfectly efficient. so it cant be separated physically

5. it can be separated but it needs energy physically cannot be separated.

Explanation:

Answer:

Solutions can be solids dissolved in liquids. When you work with chemistry or even cook in your kitchen, you will usually be dissolving solids into liquids. Solutions can also be gases dissolved in liquids, such as carbonated water. There can also be gases in other gases and liquids in liquids.

Explanation:

Answer:

D

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The definition of colloids is very disputed on whether or not it is homo/heterogenous. I wouldn't go with this answer, but its based on what you learned it was. At a microscopic level its hetero but at a macroscopic its homo.

They do have somewhat large dispersed particles but this better describes suspensions

They don't easily settle out.

And in order to be a mixture, they are made up of at least two substances

D is likely the best answer out of the bunch.

Colloids are made up of at least two substances. Therefore, option d is correct.

A colloid can be described as a mixture in which one substance consisting of dispersed insoluble particles is throughout another substance. The particles should be dispersed in a liquid. The term colloidal suspension can be referred to unambiguously as the overall mixture.

A colloid exhibits a dispersed phase and a continuous phase. The dispersed phase particles have a diameter of about 1 nm to 1 μm. Some colloids are translucent due to the Tyndall effect and other colloids can be opaque or have a slight color.

Hydrocolloids can be described as certain chemicals that are colloidally dispersible in water. Therefore becoming very "soluble" they can change the rheology by raising the viscosity.

A colloid possesses a dispersed phase and a continuous phase. A solute in a solution is individual molecules, whereas colloidal particles can be bigger.

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Answer:

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

The binding energy of a mole of 75Ga atoms is 2.98 kJ/mol.

The mass defect, which is the difference between the mass of the atom and the sum of the masses of its constituent particles:

Mass defect = (75 x 1.007825 + N x 1.008665) - 74.926500, where N is the number of neutrons in the nucleus.

To determine N, we can use the fact that the atomic number of gallium is 31:

\(N = 75 - 31 = 44\)

Substituting this value into the mass defect equation, we get:

Mass defect = \((75 * 1.007825 + 44 * 1.008665) - 74.926500 = 0.581064 amu\)

The binding energy can be calculated using Einstein's famous equation, E=mc², where m is the mass defect and c is the speed of light:

\(E = (0.581064 amu) *(1.66054 * 10^{-27} kg/amu) * (2.998 * 10^8 m/s)^2 = 4.956 *10^{-11} J\)

To convert to kJ/mol, we multiply by Avogadro's number:

\(4.956 * 10^{-11} J * (6.022 * 10^{23}/mol) / 1000 = 2.98 kJ/mol\)

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Answer:

Chemical change

Explanation:

If two types of matter reacts or are combined and energy is given off, the type of change that might have occurred is a chemical change.

A chemical change is one in which a new kind of matter is formed.

It is always accompanied by energy changes.

The process is not easily reversible.

Answer:

Is soft

Explanation:

because concrete is hard ash so t hink flour would be safer

Answer:

radiant - chemical is the best answer

Answer:

c. the use of radioisotopes to determine the age of something

Answer:

d

Explanation:

The volumetric flask should contain the prepared solution after it has been made.

My focus is being disrupted by all the commotion. 1a: the act or process of concentrating: the state of being concentrated especially: direction of attention to a single thing The student decided to focus on law as his academic major or area of interest.

23.5ml of the 458 mol L-1 solution

The moles per liter unit is used to express the solution concentrations. Consequently, change the volume of the volumetric flask's unit to liters as follows:

23.5ml

=23.5ml * 1L/10 ML

Convert the unit of the required stock solution to milliliters:

6.40* 10-3 L * 10 ml/1L = 6.40 ml

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For the given reaction also, the amount of matter stays the same, even when matter changes form.

One or even more initial substances change into the a different substance or substances during any chemical change. Because all matter is made up of atoms, both the first and final substances are made up of atoms. Because matter is neither created nor destroyed by the law of conservation of matter, we must have the same number and type of atoms after the chemical change as we did before the chemical change.

According to the law of conservation of matter, the total mass of the products in a chemical reaction must equal the total mass of the reactants. Matter may appear to vanish during a science experiment at times, but this law states that matter cannot magically appear or vanish; it simply changes from one form to another.

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Answer:

308.15

Explanation:

308.15K − 273.15 = 35°C

The Chemical Formula for Glucose is C₆H₁₂O₆.

Glucose(C₆H₁₂O₆). is an organic molecule that is generally a monosaccharide. Glucose is simply called sugar and is highly abundant in nature. It should be noted that monosaccharides are a subcategory of Carbohydrates.

Glucose is generally prepared by plants through the process of photosynthesis by taking up water and Carbon-di-oxide. The stored form of glucose is termed differently depending upon the organism it is stored. In the case of plants, the stored form of glucose is starch or amylopectin whereas in animals it is called glycogen.

It also makes up the wall of plants which is referred to as cellulose, a polysaccharide of glucose.

It is an important source of energy for almost all organisms that are present on the earth.

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Answer:

C6H12O6 is the chemical formula of glucose