How many covalent bonds are predicted for an atom of si? enter your answer in the provided box.

Explanation:

brass copper mixed with zinc

A dmixture of sugar and gari

A mixture of beans and rice

Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the  absolute pressure in the chamber and express is 57kpa

Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure

Here to find absolute pressure atmospheric pressure=92kpa and  vacuum gage=35 kpa                                      

Pabsolute pressure=Patmospehric pressure - Pvaccume

92-35=57kpa

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Zn, Cd, and Ag are transition metals that usually form only one monoatomic cation.

A monatomic cation is a cation made of only one atom.

Cations are positively charged ions, in this example Ag⁺, Cd²⁺ and Zn²⁺.

These cations form only one type of ion, while iron and copper form more than one type of cations.

Iron and copper form cations with different charges (Fe²⁺, Fe³⁺, Cu⁺, Cu²⁺).

It depends on electron configuration which type would be formed.

Electron configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

Transition metals are elements in the d-block of the Periodic table.

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A block has a density of 1.73 g/mL has a density of  1.73 * 10⁶ mg/L.

The density of a substance is the ratio of the mass of a a given volume of a substance and the volume of that substance.

Mathematically, the density of a substance is given by the formula shown below:

Depending on the units in which the mass and volume of the substance is given, the unit of density can be given as follows:

kilogram per cubic meter; kg/m³

gram per cubic centimeter; g/cm³

gram per liter; g/L

milligram per liter; mg/L

The given block  has a density of 1.73 g/mL.

To convert from gram to mg, we multiply by 1000

1.73 g = 1.73 * 1000 = 1730 mg

to convert from mL to L, we divide by 1000

1 mL = 0.001 L

Density of the block in mg/L = 1730 mg/ 0.001 L

Density of the block in mg/L = 1.73 * 10⁶ mg/L

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Answer:

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Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons . The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

example:chlorine is an example of an isotope it has a proton number of 17 and a mass number of 35 in some cases they have a proton number of 17 and a mass number of 37 there is difference in the number of neutron to calculate this we do it this way.for the first one

mass number=proton+neutron

neutron=mass number-proton

neutron=35-17

neutron=18

for the second one

neutron=37-17

neutron=20

The concentration of sodium is high outside the cell (extracellular fluid) and the concentration of potassium is high inside the cell (cytoplasm).

Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium (Na⁺/K⁺) pump).

The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.

The sodium and potassium cations move against the concentration gradients.

The sodium-potassium pump keeps a higher concentration of sodium extracellularly and a higher level of potassium intracellularly.

It is very important for many physiological processes in organism.

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Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).

Ionization take place stepwise, and each and every step has its own Ka.

H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3

H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8

HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13

According to question

To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.

Formula of Henderson-Hasselbalch equation is :

pH = pKa + log10 ([A–]/[HA])

pH = pK1+log[H2PO^4-] / [H3PO4]

pH=pK2+log[ HPO^2-] / [H2PO^4-]

pH = pK3+log[PO^3- 4] / [HPO^2- 4]

a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.

b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72

c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28

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Explanation:

The degree of deflection directly relates to the mass of the ion: the lighter the ion, the greater the deflection and the heavier the ion, the lesser the deflection. The beam of ions is then detected

and the relative abundance of each isotope of an element canthen be determined.

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The greater the mass of the isotope lesser will be the amount of deflection. The amount of deflection is related to the mass of the isotope.

An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.

As each isotope has a different mass number, this number is written after the element name for the atom. For example, an atom of carbon with a mass number of 12 will be labeled as an atom of carbon-12. Carbon-13 and carbon -14 is also examples of carbon atom.

Thus, the greater the mass of the isotope lesser will be the amount of deflection. Deflection is depend upon the mass of atom.

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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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The correct answer is option a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

Scientific knowledge is the knowledge that has been acquired and tested using the scientific method. Scientific knowledge may also comprise the observation and classification of facts to establish verifiable knowledge gained through induction and hypothesis.

A hypothesis is a proposed explanation for an event that can be tested. Hypotheses, or tentative explanations, are typically generated within the context of a scientific theory. A widely accepted, rigorously investigated and verified explanation for a collection of observations or a phenomenon is what is known as a scientific theory. The basis of all scientific knowledge is a scientific theory.

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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these ​BEST describes how a scientific explanation becomes widely accepted?

a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

b) It is debated by the scientific community.

c) A hypothesis is tested repeatedly and the results of the tests are debated.

d) A hypothesis is tested repeatedly and the results are mostly supported by scientific investigations.

Answer: 27.69 mL^3

Explanation:

32.5 g * 0.852 g/mL=

32.5*0.852=27.69 mL^3       ==>Volume is expressed in units cubed.

The pH of the diluted solution is 5.53.

Henderson–Hasselbalch equation for buffer solution:

pH = pKa + log(c(CH₃COO⁻)/c(CH₃COOH))

pH = 5.0 ⇒ c(H⁺) = 10⁻⁵ M

pKa = 4.75 ⇒ Ka = 1.78×10⁻⁵

log(cs/ck) =  5.0 - 4.75 = 0.25

c(CH₃COO⁻)/c(CH₃COO⁻) = 10∧(0.25) = 1.778

c(CH₃COO⁻) + c(CH₃COOH) = 0.1 mM

c(CH₃COO⁻) + c(CH₃COOH) = 1 × 10⁻⁴M

c(CH₃COOH) = 3.6x10⁻⁵ M; concentration of acetic acid before dilution

c(CH₃COOH) = 3.6x10⁻⁶ M; concentration of acetic acid after 10 times dilution

c(CH₃COO⁻) = 6.4x10⁻⁵ M; concentration of sodium acetate before dilution

c(CH₃COO⁻) = 6.4x10⁻⁶ M; concentration of sodium acetate after dilution

c(H⁺) = 10⁻⁶ M; concentration of hydrogen ions

After buffer solution is diluted to 1 l:

Ka = (c(CH₃COO⁻) + x) × (c(H⁺) + x) / (c(CH₃COOH) - x)

1.78×10⁻⁵ = (6.4x10⁻⁶ M + x) × (10⁻⁶ M + x) / (3.6x10⁻⁶ M - x)

x = 2.12×10⁻⁶ M

c(H⁺) = 10⁻⁶ M + 2.12×10⁻⁶ M

c(H⁺) = 3.12×10⁻⁶ M

pH = -logc(H⁺)

pH = -log3.12×10⁻⁶ M

pH = 5.53

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Use only sterile water, as was previously indicated. Water is made bacteriostatic by adding benzyl alcohol. You can immediately decide which is suitable based on allergies.

If you are allergic to benzyl alcohol, avoid using or drinking bacteriostatic water altogether and opt for sterile water.

Another distinction is with indications. The FDA regulates the purposes for which drugs are used or what is disclosed on their labels. While sterile water is designated for both irrigation and injection, bacteriostatic water is only intended for injections.

The difference of several uses, as has previously been established, is crucial. Due to the absence of a bacteriostat, sterile water can only be utilized once.

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Answer:

a water molecule.  

Explanation:

The two reacting groups are a carboxylixc acid group (-COOH) and an amine (-CNH2).  The forms the peptide link (-C-CO-N-C) and a molecule of water is released (H2O).

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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The features are shared by all three-carbon monosaccharides, They are all pentoses. In their linear forms, they all contain carbon carboxyl and several hydroxyl functional groups. In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.

Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to make all sorts of materials, including plastics and alloys such as steel (a combination of carbon and iron).

Life on Earth cannot exist without carbon. This allows carbon to readily form bonds with other atoms, giving it flexibility in the forms and functions that biomolecules such as DNA and RNA can adopt, and is essential for growth and replication, the defining properties of life. This is partly due to

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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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Answer: a

Explanation:

A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n)  carbohydrates.

A molecule with the formula C₅H₁₀O₅  is carbohydrates.

What are Carbohydrates?

therefore the molecular method C₅H₁₀O₅ represents carbohydrates.

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The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.

Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.

There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.

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Answer:

A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)

Explanation:

a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid

Triplet multiplicity would expect in a 1h NMR spectrum for the indicated proton(s).

The spectrum is the invisible radio frequencies that radio signals pass through. These signals let you make phone calls from your mobile device, tag your friends on  call an Uber, and get directions to your destination, all from your mobile device.

Spectrum management is the art and science of managing the use of the radio spectrum to minimize interference and ensure that the radio spectrum is used in the most efficient manner possible for the public good. For USDOT, this focuses on supporting safe, efficient, and economical transportation. Spectrum Networks is a suite of news and sports networks owned and operated by Charter Communications, Inc.

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The appropriate designation for an ion with 24 protons, 27 neutrons, and 21 electrons is [^51 Cr24].

How to represent an atom with atomic number and mass?

The smallest component of ordinary stuff that makes up a chemical element is an atom. Each neutral or ionized atom makes up a solid, liquid, gas, or type of plasma. Atoms are very small, with an average diameter of 100 picometers.

Symbolical representation is :

            [ Xz^A] or  [^A Xz]

Where,

A = Mass , X = atom, Z = Atomic number.

The quantity of protons and neutrons in an atom's nucleus is referred to as its mass number.

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If 25.0 ml is taken from a stock solution and added to volumetric flask and diluted up to the calibration mark, then the new concentration will be 1.49 g/L.

Now, Concentration of solution is defined as amount of solute present in specific volume of the solution.

Molarity (M) = moles of solute ÷ litres of solution

Here, the concentration of solution is given as, 14.9 g/l

and, the volume of solution is 25.0 ml= 0.025 l

using the equation,

   14.9 = moles of solute ÷0.025

   moles of solute = 0.3725 moles

0.025 l is added to a 0.25 l (250.0 ml =0.25 l) volumetric flask and diluted up to the calibration mark.

Since,

volume of solution = volume of flask

And, moles of solute remains the same.

Therefore,

The new concentration is,

concentration = (0.3725 ÷ 0.25) g/l

New concentration = 1.49 g/l

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The atomic number of an isotope of tellurium that has 71 neutrons is 52.

The atomic number of an element is the number of protons in an atom of that element.

The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.

According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;

atomic number = 123 - 71

atomic number = 52

Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.

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Answer:

Explanation:l do not no the answer

answer:

d. the study of heat flow.

explanation:

thermodynamics is the study of the relations between heat, work, temperature, and energy.

Decane has the highest viscosity at 25°C.

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.

Viscosity depends on intermolecular interactions and molar mass of the substance.

Ethane, pentane and decane are acyclic saturated hydrocarbons (alkanes).

At 25°C, ethane (C₂H₆) is in gaseous state of matter. Its molecular mass is the smallest of these three molecules, so it has lowest viscosity.

Decane (C₁₀H₂₂) and pentane (C₅H₁₂) are liquids at 25°C, but decane has greater molecular mass, therefore the highest viscosity.

M(C₂H₆) = 30 g/mol; molar mass of an ethene

M(C₁₀H₂₂) = 72 g/mol; molar mass of pentane

M(C₅H₁₂) = 144 g/mol; molar mass of decane

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The average atomic mass of the element X is 85.5257 amu

Ffrom the question given above, the following data were obtained:

The average atomic mass of the element can be obtained as illustrated below:

Average atomic mass = [(Mass of isotope 1 × Abundance of isotope 1)/100] + [(Mass of isotope 2 × Abundance of isotope 2)/100]

Average atomic mass = [(83.9118 × 75.15)/100] + [(86.9092 × 25.85)/100]

Average atomic mass = 85.5257 amu

Thus, the average atomic mass of the element is 85.5257 amu

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