3-hydroxybutanal can exist in equilibrium as a cyclic hemiacetal.true /false

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. They have eight valence electrons, which fill their outer energy level.

Explanation:

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.

The receptor in blinking is receptors present in eyes and the effectors are the muscles in the eyes that cause the eye to contract and thereby encourages blinking of eye.

Receptors are the organs responsible for receiving external stimuli and transmitting them to the Central Nervous System. Effectors are the organs that carry out the central nervous system's instructions in response to external stimuli.

All receptors are essentially supplied by sensory nerves that can carry the stimulus to the CNS. Effectors are primarily supplied by motor nerves, which are capable of carrying instructions from the CNS.

Skin, eye, ear, nose, and tongue are all examples of receptors. Effectors are either muscles or glands.

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The correct answer is 2255 bicycles. (b) 50 frames left over, 305 wheels left over (c) the handlebars.

A manufacturer of bicycles has 4815 wheels, 2305 frames, and 2255 handlebars.First, each bicycle has 2 wheels, so the total pairs of wheels is 4815/2 = 2507.5.

The total amount of bicycles that the manufacturer can make is equal to the smallest number of a determined part that he has, in this case is 2255.This is because he only has 2255 handlebars, after he makes 2255 bicycles, he runs out of handlebars, and can not make more.then with the parts listed in the problem, the manufacturer can do 2255 bicycles

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This statement is true.

When all of the features of a compound cannot be explained by a single structure, numerous structures of that compound are employed to explain all of the attributes of the given molecule.

This phenomenon is referred to as resonance, and all structures are referred to as resonant structures.

As a result, resonance structures are collections of Lewis structures that explain the delocalization of electrons in a polyatomic ion or molecule, and the larger the extent of electron delocalization, the lower the overall energy in the system. Thus, resonance is known to increase compound stability by lowering energy.

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The object would not float but sink in water.

The term density refers to the ratio of the mass to the volume of a body. Now that we know that the density of water is 1 g/cm^3. A substance that would float in water must have a lower density than that of water.

Thus;

Mass of the object = 569 kg or 569000 g

Volume of the object = 74.0 cm x 55.0 cm x 35.0 cm = 142450cm^3

Density of the object = mass/ volume = 569000 g/142450cm^3

=  3.99 g/cm^3

Hence, the object would not float but sink in water.

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The first deaf Africans American alumnus of Gallaudet to earn a doctorate was Dr. Glenn B. Anderson in 1982.

As the first Deaf African-American doctor in the United States, Dr. Glenn B. Anderson is well-known in his field.

He was born and reared on Chicago's South Side, and at the age of seven, he lost his hearing. His parents advised him "you have to be twice as excellent as everyone else to succeed" when they encountered difficulties and challenges in his early life.

Dr. Anderson graduated with a bachelor's degree in psychology from what was then the Gallaudet College in 1968, and he then went on to the University of Arizona to get a master's degree in rehabilitation counseling.

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Water has more structure than other liquids due to its ability to form hydrogen bonds. due to this phenomena, water expresses a comparatively high density , which allows it to cushion and protect the body’s structures.

What causes density?

The density of a substance is that the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and the way they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume; D = m/v.

Why is density important?

Density is a crucial concept because it allows us to determine what substances will float and what substances will sink when placed in a liquid. Generally, substances float goodbye as their density is less than the density of the liquid they are placed in.

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A reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3 and the reaction is Grignard reagent

Here in the Grignard reagent reaction chemical compound with the generic formula R-Mg-X where X is halogen  and R is organic group and grignard reaction is the organometallic chemical reaction in which alkyl, allyl, or magnesium halide in the synthesis of that compound 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3

Synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate reaction are followed:

4 liters of the 10% solution are needed.

ω₁ = 4% ÷ 100% = 0.04; mass percentage of 8 liters solution

V₁ = 8 L; volume of 4% solution

ω₂ = 10% ÷ 100% = 0.1; mass percentage of solution

ω₃ = 6% ÷ 100% = 0.06; mass percentage of the final 6% solution

V₂ = ?; volume of 10% solution

V₃ = V₁ + V₂; volume of the final 6% solution

ω₁ · V₁ + ω₂ ·V₂ = ω₃ · V₃; formula to calculate volume of the solution

0.04 · 8 L + 0.1 · V₂ = 0.06 · (8 L + V₂)

0.32 L +  0.1 · V₂ = 0.48 L + 0.06 · V₂

0.04 · V₂ = 0.16 L

V₂ = 0.16 L ÷ 0.04

V₂ = 4 L; volume of the 10% solution

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Wastewater, another name for liquid waste, has a very diverse composition that primarily depends on its source. Residential, commercial, and industrial regions are the three primary sources in towns and cities.

What are liquid wastes?

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The density of a sample  thought to be pure lead occupies a volume of 15.0 mL and has a mass of 160.0 = 10.7 g/mol.

Density = [tex]\frac{mass}{volume }[/tex]

         = [tex]\frac{160}{15}[/tex]

density    = 10.7 g/mol

Density is termed because the ratio of mass of the object to the volume of the object. Different substances have several densities. The mathematical expression for density is as follows:

Density=Mass/Volume.

The mass of a substance is expressed in kilograms and  therefore the volume is expressed in liter.

Volume is the  total amount of space occupied by a substance, whereas  mass is the amount of matter it contains in it . The amount of mass per unit of volume is a sample density.

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If one can stop breathing for the longest time builds up in their systems pH of the cells causing the pH of their own blood to drop slightly 'pH level increases'

pH means quantitative measure of the acidity or basicity of aqueous or other liquid solutions

For most people its safe to hold your breath for a minute or two but so much longer can decreases oxygen flow to the brain can causing damage your brain as well as in heart a lack of oxygen can cause abnormalities or rhythm and can affect the pumping action of heart and when the brain senses the change in pH due to increased carbon dioxide it increases our respiratory system to get more oxygen and blow out more carbon dioxide in an taking the normal balance between oxygen and carbon dioxide that's why pH level increases

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The rate of effusion rates of two

The rate of effusion rates of two different

gases are

(8) Rate of effusion of gas (T2) Rate of effusion of gan

molar mass 2 of gas molay mas 1 of gas

71/2

molar mass № 32

2 = molar mass 32

the molar mass of gas 2 128

So, the molar mass of gas = 128

approximately to molar mass

that is

equal

to

of Xenon noble

·gas.

So, Xenon noble Igas has an effusion rate of approximately half the rate of effusion for 02.

Heart failure is the most common cause. Exudate is caused by vascular or lymphatic obstruction, inflammation, infection, lung injury, and tumors. There are two types of swelling. Edema - swelling that occurs primarily in the soft tissues of the body and exudate - swelling or fluid in the common spaces. Edema and exudate are the results of changes in intracellular and extracellular fluid levels.

The cause of knee effusion determines care and treatment. When the cause of swollen joints is treated, the swelling often goes away. However, not all causes of knee fluid retention can be cured.

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A  Slump is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.

What is a slump?

A slump is a colloquial expression denoting a precipitous drop in commercial activity, trade, or market values. The term "slump" is particularly adaptable since it may be used to refer to both a brief, abrupt collapse and a longer-lasting, more steady period of low activity or value. There are downturns in the markets, the economy, industries, and incomes, among other things.

A slump typically refers to the start of a recession in economic terms. The months prior to the official announcement of a recession are simply referred to as a protracted economic slump because a recession is not officially announced until several months of decreased activity have passed.

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In the mass spectrum of pentane, the presence of a peak with an m/z = 29 most likely is due to the loss of butyl radical from the molecule.

A spectrum (spectra or spectra) is a state that is not confined to a particular set of values ​​and can vary seamlessly on a continuum. The term was first used scientifically in optics to describe the rainbow colors of visible light after passing through a prism.

The Spectrum of Life in the Hall of Biodiversity is an evolutionary journey through the incredible diversity of life on Earth. The 1,500 specimens represent a wide range of bacteria, fungi, plants and animals, from the smallest microbes to giants of land and water. A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or parts thereof) emitted or absorbed by an object or substance, atoms or molecules. Examples of spectra include the rainbow, the colors of the sun's emission, and infrared absorption wavelengths of molecules.

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Answer:

Bohr's model of hydrogen is based on the nonclassical assumption that electrons travel in specific shells, or orbits, around the nucleus.

Explanation:

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In chemical communication between cells, a secretory cell secretes a chemical messenger that binds to receptors on the target cell.

Cells are the basic building blocks of all living things. The human body is made up of trillions of cells. They give structure to the body, absorb nutrients from food, convert those nutrients into energy, and perform specific functions. In multicellular organisms, such as higher plants and animals, specialized cell groups are organized into tissues and organs.

Cells can be used as the basis for describing organisms as unicellular or multicellular. Unicellular organisms are organisms that have only one cell, i.e. single-celled organisms. Prokaryotes and protists are examples. Multicellular organisms are organisms with more than one cell. Examples are plants and animals.

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All of the amino acids could form a hydrogen bond with another amino acid in the chain to stabilize the secondary structure of a b-pleated sheet.

Protein is composed of amino acid linked with peptide bond.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone (see the picture below).

Usually, amino acid proline is found in the edge strands in beta-sheets. Beta-branched amino acids valine, threonine and isoleucine and aromatic amino acid residues tryptophan, tyrosine and phenylalanine are found middle of beta-sheets.

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In this way, the Adhesion of water through hydrogen bonds to the molecules, which comprise the Villi on the cat's tongue.

What is Adhesion?

The act or quality of sticking or remaining fastened: the glue's adherence to the wood b. Physics The attraction between two substances that is strong enough to be seen at a macroscale and is caused by their differences.

What kind of bonds do water molecules form?

Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond known as a hydrogen bond is formed when individual water molecules are attracted to one another.

Which of the cat's tongue's villi works to resist gravity's pull downward?

By forming hydrogen bonds with the molecules that make up the villi on the cat's tongue, water adheres to them in this way, helping to fend off the effects of gravity. As a result, the phenomenon of adhesion aids in the maintenance of entire, joined drops of water.

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Solute : The minor component in a solution mixed in the solvent. Example - Salt, Sugar, Carbon dioxide (CO2) , Acetic acid etc.

Solvent : The substances that are used to disslove solutes ( this may be in the form of solid, liquid and gases) is known as solvent. Example : Water, Milk, Air , Ethanol, Methanol etc.

Solution : A solution is a homongeneous composition of one or more solutes mixed in a solvent. Example : Salt Water, Sugar mixed in water,  Alcohol in water etc.

Types of Solution : Hypotonic , Isotonic, Hypertonic.

According tov question,

100 mm solution of glucose is more concentrated than 0.1 m solution of glucose because when we try to find the molality of 100 mm solution it is 0.617 m hence 100 mm solution of glucose is greater.

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Answer:2.5 mol

Explanation:

Step 1 convert lbs to kg step 2 kg to g 3rd step g to mg

Here given data is 0.47 pound then we have to convert how many miligram = ?

So here 0.47 pound (lbs) = 0.2131 kg

1 kg = how many gram then 1kg = 1000 gram

So, 0.2131 kg = 213.1 gram

So 1 gram = 1000 mg then  

So, 213.1 gram = 0.2131 mg

Then here three conversion are seen means step 1 =0.47 pound (lbs) = 0.2131 kg to step 2 = 2131 kg = 213.1 gram to step 3 = 213.1 gram = 0.2131 mg

This is the conversion from beginning to ending

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The statement oxygen is negative and hydrogen is positive is true.

Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.

Elements having one electron in their outermost or valence shell are  situated to the left of the periodic table and are positive as they  loose their one electron present in valence shell to form cations that are positively charged ions.

Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.

Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .

Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.

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In 1904, J.J. Thomson published the Thomson model of the atom. The plum pudding model is often referred to as Thomson's model.

In 1897, he also made the electron discovery. Scientists Rutherford and Bohr subsequently refuted this theory. According to J.J. Thomson, an atom is a positively charged sphere with embedded negatively charged electrons.

Neils Bohr disproved it by demonstrating that any atom's mass is centred in its positively charged centre, while negatively charged electrons orbit the positive centre. In highly quantized energy levels, according to Bohr's theory, electrons orbit an atom's nucleus rather than being incorporated into it.

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If reaction occurs with an 73.9% yield, the mass of iron which should be reacted to produce 63.0 g of Fe₂O₃ is 59.1 g

The balanced chemical equation of the reaction is :

                   4Fe + 3O₂ → 2Fe₂O₃

Molar ratio of iron and Fe₂O₃ is 4 : 2

For a reaction having 100 % yield, every 4 mole of iron will produce 2 moles of Fe₂O₃.

So, 63.0 g of Fe₂O₃ is produced by reaction. Let's use molar mass of Fe₂O₃ , which is 159.6 g/mol to find out number of moles produced.

              moles =      63.0 g     = 0.39 mol

                             159.6 g/mol

moles of iron needed  if % yield is 100.  

= 0.39 mol x 4 mol

                      2 mol

= 0.78 mol Fe

Since given percentage yield is 73.9%, more Fe is reacted.

       % yield =    actual yield     x 100

                      theoretical yield

         73.9 % =         63.0 g           x 100

                         theoretical yield

         Theoretical yield = 85.2 g

So, to find out mass of iron reacted to theoretically produce 85.2 g Fe₂O₃

Use molar mass of Fe and mole ratio of two compounds.

        moles = 85.2 g         = 0.53 moles Fe₂O₃

                     159.6 g/mol

using this,

 = 0.53 Fe₂O₃  x     4 moles Fe    

                 2 moles Fe₂O₃

 = 1.06 moles Fe

So,

The mass of iron = ( 1.06 x 55.8 )g

                            = 59.1 g

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Answer:

The amount/type of stain

Explanation:

You would want to ensure that the stain was the same in both samples.  

The diameter water pipe is required to handle 0.075 m3/s and a 500 kpa pressure drop is 149.4mm.

The force applied perpendicularly to an object's surface, denoted by the symbol p or P, is stated to be applied per unit area that the force is claimed to be dispersed over. The pressure that is supposed to be related to the ambient pressure is called the gauge pressure, also known as gauge pressure.

[tex]Q=0.075m^3/s[/tex]

ΔP=500kPa

L=175m

e=2.5mm

Properties of water :

[tex]\rho=1000kg/m^3[/tex]

[tex]\mu=0.001N-s/m^2[/tex]

Reynold's number Re=ρVD/μ

where V= Q/A=Q/(π/4)[tex]D^2[/tex]=4Q/π[tex]D^2[/tex]

Re=(ρ(4Q/π[tex]D^2[/tex])D)/μ

=4ρQ/πDμ=4(1000kg/[tex]m^2[/tex])(0.075[tex]m^3[/tex]/s)/πD(0.001N-s/[tex]m^2[/tex])

Re=(95492.966/D)

Darcy friction formula

f=1.325/[ln(e/3.70+5.74/[tex]Re^{0.9}[/tex])[tex]]^2[/tex]

f=1.325/[ln(e/3.70+5.74/(95492.966/D[tex])^{0.9}[/tex])[tex]]^2[/tex]____(1)

from, [tex]h_L[/tex]=8fL[tex]Q^2[/tex]/g[tex]D^2[/tex][tex]\pi^2[/tex]

Δρ/ρμ=8FL[tex]Q^2[/tex]/[tex]\pi^2[/tex]g[tex]D^5[/tex]

500×[tex]10^3[/tex]Pa/(1000kg/[tex]m^3[/tex])=8f(175m)(0.075[tex]m^3[/tex]/s[tex])^2[/tex]/[tex]\pi^2[/tex][tex]D^5[/tex]

f/[tex]D^5[/tex]=626.642

f=626.642[tex]D^5[/tex]_____(2)

solving equation 1 and 2

we get f=0.0467 and D=0.1494m

D=149.4mm

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One molecule of nabh4 will reduce only two molecules of m-acetylbenzaldehyde to form the corresponding product because there are only two functional groups that can react with NaBH4, namely the ketone and the aldehyde, but NaBH4 had four H present to protonate the molecule.

What is protonation?

An atom, molecule, or ion can be protonated by adding a proton to it. The difference between protonation and hydrogenation is that during protonation, the protonated species' charge changes, whereas it remains unchanged during hydrogenation. Numerous catalytic processes result in protonation.

A conjugate acid is created when a proton (or hydron, or hydrogen cation), (H+), is added to an atom, molecule, or ion. Deprotonation is the analogous process that occurs when a proton is taken out of a Bronsted-Lowry acid.

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Answer:

infectious diseases, chemical pollution and increased ultraviolet ( uv ) radiation

If an object weighs 38.325 lbs = 17,400 g would be mass in grams

In physics, mass is a numerical representation of inertia, which is a basic characteristic of all matter. The resistance a body of matter offers to a change in its speed or location as a result of the application of a force is what it is in essence. The change a force applies produces a change that is smaller the more mass a body has.

The kilogram, which is defined in terms of Planck's constant as equal to 6.62607015 × 10^ -34 joule second, is the unit of mass in the International System of Units (SI). One kilogram times one square meter per second squared is equivalent to one joule.

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