What is the total number of electrons in an atom of an element with an atomic number of 18 and a mass number
of 402
a. 58
c. 22
b. 18
d. 40

Answer:

H₂CO₃

Explanation:

Water + Carbon di oxide

H20+ CO2

= H2CO3

Answer:

cyfctr rytfuhv

Explanation:

Answer:

the hawk

Explanation:

in order it would be: producer, primary, secondary, tertiary

Answer:

the hawk is the tertiary consumer

Explanation:

Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.

1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.

A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.

In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.

Thus, option B is correct.

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Answer:

1.0535×10(exponent24)

Explanation:

N (number of molecules)

n(number of moles)

L( Avogadro's constant )

N=n×L

N=1.75×6.02×10(exponent 23)

Explanation:

In one mole we always have:

1 mol = 6.02 X 10²³ molecules

So emulates simple rule of 3 we will have;

1 mol ----------> 6.02 X 10²³

1.75 moles ----> X

X = 1.0535 X 10²⁴ molecules

Hope this helps, Good studies!

The overlapping of atomic orbitals distinguishes sigma and pi covalent bonds. When atomic orbitals overlap, covalent bonds form.

The way atomic orbitals overlap affects bond properties such as bond length, bond angle, and bond enthalpy. This overlap occurs in two ways, resulting in two types of covalent bonds: sigma bonds and pi bonds.

This type of covalent bond is formed by head-on positive (same phase) overlap of atomic orbitals along the internuclear axis. Sigma bonds are the strongest covalent connections due to the direct overlapping of the orbitals involved. The electrons in a bond are frequently referred to as electrons.

In this state, one half-filled p orbital from each participating atom overlaps head-on along the internuclear axis.

Pi bonds are generated by the sideways positive (same phase) overlap of atomic orbitals parallel to the internuclear axis. The axes of the atomic orbitals are parallel to each other during bond formation, while the overlapping is perpendicular to the internuclear axis.

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The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Complete Question

A chemist must prepare 400 mL of 1.00M aqueous aluminum sulfate working solution. He'll do this by pouring out 1.82 mol/L aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. How many mL of the aluminum sulfate stock solution should the chemist pour out?

The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Given:

V1 = 400ml, M1 = 1 M, V2 = ?, M2 = 1.82 M

Hence, the relation between molarity and volume is as follows.

M1V1 = M2V2

1.00M x 400ml = 1.82 x V2

V₂ = 219.8 ml

Thus, we can conclude that 219.8 ml of the aluminum sulfate stock solution should the chemist pour out.

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Answer:

0.157689 moles

Explanation:

Answer:

The average atomic mass of zinc is 65.38 u.

Explanation:

Hope this helps.

Give brainliest please!

Answer:

D

\( \: \: \: \: \)

Answer:

Explanation:

It is the horizon that contains the least humus.

Answer:   if this is what you mean but i hope it helps: a flashlight aiming at a mirror (your light wave) will be reflected off the mirror (use this to make your own)

Explanation:

brainlest pleas

Answer:

True.

Explanation:

Yes, all systems disperse their energy spontaneously because all types of  energy spontaneously flows from concentrated to dispersed if it is not hindered by any material in their way. Energy can be prevented from spreading by materials such as containers. If there is no substance in the path of energy so it can disperse automatically from a concentrated region to a lower region.

Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.

Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.

The number of mole present in the aluminum foil, given that the foil has a thickness of 1.0 mm is 0.7 mole

We'll begin by obtaining the mass of the aluminum foil. Details below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of aluminum = 2.702 × 7

Mass of aluminum = 18.914 g

Finally, we shall determine the number of mole present. Details below:

Mole = mass / molar mass

Number of mole of aluminum = 18.914 / 27

Number of mole of aluminum = 0.7 mole

Thus, the number of mole is 0.7 mole

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The given statement, the majority of the energy captured in the krebs cycle is in the form of NADH, hence it is true and the other form is \(FADH_{2}\) and ATP.

The Krebs cycle, sometimes referred to as the citric acid cycle or the tricarboxylic acid cycle, is one of the most important biological reaction chains. This series of reactions provides the majority of the energy needed by complex organisms, and the molecules produced by these reactions can also be utilized as building blocks for a variety of vital processes, including the synthesis of fatty acids, steroids, cholesterol, amino acids for the creation of proteins, and the purines and pyrimidines necessary for DNA synthesis.

The Krebs cycle gets its energy from lipids (fats) and carbohydrates, both of which lead to the molecule acetyl coenzyme-A being produced (acetyl-CoA).The eight phases of the Krebs cycle, all of which take place inside the mitochondria of eukaryotic cells, begin with this acetyl-CoA reacting.

Although the Krebs cycle does produce carbon dioxide, it does not immediately lead to the synthesis of significant amounts of adenosine triphosphate (ATP), nor does it require the presence of oxygen. Instead, NADH and FADH2, which are produced by this cycle, feed into the respiratory cycle, which is also found inside the mitochondria. The respiratory cycle is in charge of both the significant ATP synthesis and oxygen consumption.

Additionally, the Krebs cycle needs NADH and FADH2 to function, which the respiratory cycle transforms into. Therefore, the respiratory cycle cannot run without oxygen, which causes the Krebs cycle to stop. The Krebs cycle is therefore regarded as an aerobic process for generating energy.

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The phases of matter in order from the strongest collective electrostatic forces to the weakest collective electrostatic forces is solid, liquid, gas. Therefore, option C is correct.

A state of matter is one of the various forms that matter can take. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.

When compared to liquids and gases, solids typically have the strongest intermolecular forces. Because the particles in solids are closely packed, they are incompressible and have a high density.

Solids with high order have the strongest intermolecular interactions, while gases with high disorder have the weakest.

Thus, option C is correct.

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Answer: 6 moles of Carbon.

Explanation: One mole of Carbon is equal to 12 grams of Carbon, so you would divide 72 by 12 and the answer would be 6.

Only when an electric current is running through the coil of insulated wire that is wrapped around the iron nail will it behave like a magnet. The iron nail loses its magnetism when the electric current in the coil is stopped.

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.

An electromagnet is a magnet that consists of a piece of steel or iron encircled by a coil. When an electric current is run through the coil, the metal turns magnetic.

Thus,  The iron nail loses its magnetism when the electric current in the coil is stopped.

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Answer:

its matter

Explanation:

i just did the test

n = 4N₀ = 1 gram of iodine 131Nt = 1(1/2)⁴Nt = 1(1/16)Nt = 0.0625 grams. Therefore, after 32 days, approximately 0.0625 grams of iodine 131 will be left in the patient's bloodstream.

If a patient is given a total dose of 1 gram of iodine 131, the amount that will be left in the patient's bloodstream after 32 days can be calculated using the half-life of iodine 131. The half-life of iodine 131 is approximately 8 days. The formula used to calculate the amount of radioactive substance remaining after a certain number of half-lives is given as: Nt = N₀(1/2)ⁿwhere: Nt = the amount remaining after n half-lives N₀ = the original amount. So, if the patient is given 1 gram of iodine 131, the amount remaining after 32 days can be calculated as follows:32 days is equivalent to 4 half-lives (32 ÷ 8 = 4). Therefore: n = 4N₀ = 1 gram of iodine 131Nt = 1(1/2)⁴Nt = 1(1/16)Nt = 0.0625 grams. Therefore, after 32 days, approximately 0.0625 grams of iodine 131 will be left in the patient's bloodstream.

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The molarity of the solution is approximately 5.0 M.

To calculate the molarity (M) of a solution, we need to divide the moles of solute by the volume of the solution in liters.

First, we need to convert the mass of NaOH to moles. The molar mass of NaOH is 22.99 g/mol for Na, 16.00 g/mol for O, and 1.01 g/mol for H, giving us a total molar mass of 39.99 g/mol for NaOH.

Moles of NaOH = 120.0 g / 39.99 g/mol

= 3.00 mol

Next, we divide the moles of NaOH by the volume of the solution in liters:

Molarity (M) = moles of solute / volume of solution in liters

M = 3.00 mol / 9.60 L

= 0.3125 M

Rounding to the appropriate number of significant figures, the molarity of the solution is approximately 5.0 M.

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The interactions that hold hair strands together and are pH-sensitive are (iii) a disulfide linkage. The correct answer is "iii only".

Disulfide linkages are formed between sulfur atoms in the amino acid cysteine, which is present in the protein structure of hair. These linkages are responsible for the structural stability and strength of hair. When the pH of the hair is altered, such as through the use of chemical treatments or hair products, the disulfide linkages can be disrupted. This can lead to changes in the shape and texture of the hair. Therefore, the presence and integrity of disulfide linkages in hair are pH-sensitive. On the other hand, salt bridges and hydrogen bonds, mentioned in options (i) and (ii) respectively, are not directly pH-sensitive. Salt bridges are ionic interactions that can be influenced by pH indirectly through changes in ionization states of charged amino acids. Hydrogen bonds, while important for the structure of hair, are not directly affected by pH changes.

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The regiochemistry of hydroboration/oxidation of alkenes is (a) Markovnikov.

The hydroboration/oxidation reaction follows Markovnikov's rule, which states that the electrophile (in this case, the boron atom) adds to the carbon atom of the double bond that has the greater number of hydrogen atoms attached to it. The regioselectivity of the reaction is determined by the relative stability of the carbocation intermediates formed during the reaction.

In hydroboration, the boron atom adds to the less substituted carbon atom of the double bond, leading to the formation of a boron-alkyl bond and a boron-hydrogen bond. Subsequently, in the oxidation step, the boron-alkyl bond is replaced with an alcohol group (-OH) while maintaining the regiochemistry established during hydroboration.

Therefore, the regiochemistry of hydroboration/oxidation of alkenes is Markovnikov, where the electrophilic addition occurs preferentially at the carbon atom of the double bond that has the greater number of hydrogen atoms attached to it.

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Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

Answer:

Falso.

Explanation:

El modelo cuántico (no relativista) de Schrodinger, piensa a los electrones como ondas estacionarias, tal que la amplitud de dichas ondas decae muy rápidamente cuando se "alejaban" del radio atómico. (Es decir, habia poca probabilidad de que los electrones escaparan del radio atomico, y era por ello que se quedaban orbitando cerca del nucleo). Es decir, podríamos pensar en esto como una "nube de probabilidades" más que una nube electronica

La idea de nube electrónica realmente viene de modelos previos, como el de Rutherford o el de Bhor, los cuales eran modelos clásicos.

There are 11.6 mmol of iron in 650 mg of iron.

Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.

We need to calculate how many millimoles (mmol) are present in the given amount of iron.

We will use the following conversion:

1 g = 1000 mg

1 mol = molar mass in grams

1 mmol = 0.001 mol

Number of moles of iron

= 650 mg ÷ 1000 mg/g

= 0.65 g ÷ 55.85 g/mol

= 0.0116 mol

Number of millimoles of iron

= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron

= 11.6 mmol

Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.

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Answer:

1.

2.

Explanation:

Protons and neutrons are located at the center of an atom which is nucleus .

Electrons will orbit around the nucleus .

Answer:

The volume of the hydrogen produced is always twice the volume of the oxygen produced, because water contains two atoms of hydrogen for each atom of oxygen.