How many iron atoms are present in 3.0 mol of iron metal? Group of answer choices
18 .06 x 1023 iron atoms
6.02 x 1023 iron atoms
12.04 x 1024 oxygen atoms
6 potassim atoms

In an atom, number of electrons and protons is same and thus number of electrons and protons are 79 in an ion of gold(III).

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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When the coordination number of a complex is 4, the common geometries that can be adopted by the complex are tetrahedral and square planar.

A tetrahedral complex has four ligands that are arranged symmetrically around the central metal atom to form a tetrahedron.

The bond angles between the ligands are 109.5 degrees, and the geometry is often seen in complexes of transition metals with ligands that have lone pairs of electrons.

On the other hand, a square planar complex has four ligands that are arranged in a plane around the central metal atom, with bond angles of 90 degrees.

This geometry is often seen in complexes of transition metals with ligands that are strong-field and can form pi bonds with the metal atom.

Trigonal bipyramidal and see-saw geometries are not common for complexes with a coordination number of 4, as they require a coordination number of 5.

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Answer:

Explanation:

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Answer:

The reddish-brown substance is a different color than the fertilizer, which is white, and the substance that makes up the pipe, which is gray. This means that they cannot be the same substance because they do not have the same properties. The atomic models show that the reddish-brown substance is made up of different repeating groups of atoms than the fertilizer and the pipe substance. The difference in atoms caused the difference in properties.

Explanation:

lul

People of westfield identifying the reddish brown substance and that substance is rust i.e. iron oxide.

Rust is a chemical compound which is formed by the oxidation reaction between iron and oxygen for the formation of iron oxide.

People of westfield observed the reddish brown color in the water, that is the rust compound which is obtained by the chemical reaction occur between the iron pipes and the compound present in the fertilizers that are present in water.

Hence, the reddish brown substance in rust.

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Answer:

an acid is a proton (H⁺) donor

Explanation:

hope this helps

pls nmark brainliest

Newton's laws are not ideal for analyzing electrons' motion due to the nature of quantum mechanics, wave-particle duality, and the Heisenberg uncertainty principle.

Newton's laws are not invalid for analyzing electrons' motion due to the following reasons:
1. Quantum mechanics: Newton's laws are based on classical mechanics, which works well for macroscopic objects. However, when dealing with microscopic particles like electrons, quantum mechanics becomes the more accurate framework for understanding their behavior.
2. Wave-particle duality: Electrons exhibit both particle-like and wave-like properties, which cannot be accurately described by Newton's laws. This duality is better explained by quantum mechanics.
3. Heisenberg uncertainty principle: According to this principle, it is impossible to precisely determine an electron's position and momentum simultaneously. Newton's laws rely on exact knowledge of these quantities, which makes them unsuitable for analyzing electron motion at the quantum level.
In conclusion, Newton's laws are not ideal for analyzing electrons' motion due to the nature of quantum mechanics, wave-particle duality, and the Heisenberg uncertainty principle.

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The amount of drug in the body is 4600 mg. The amount of drug in the plasma is 3 mg. The amount of drug in the tissues is 4597 mg.

The amount of drug in the body can be calculated by multiplying the volume of distribution (Vd) by the plasma concentration. In this case, the amount of drug in the body would be 4600L x 1 mg/L = 4600 mg.

The amount of drug in the plasma can be calculated by multiplying the plasma concentration by the volume of the plasma. In this case, the amount of drug in the plasma would be 1 mg/L x 3L = 3 mg.

The amount of drug in the tissues can be calculated by subtracting the amount of drug in the plasma from the total amount of drug in the body. In this case, the amount of drug in the tissues would be 4600 mg - 3 mg = 4597 mg.

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Actually Welcome to the Concept of the Astrophysics.

Let's categorize them eventually ==>

1.) Earth ==> 1.) travels around the Sun

2.) takes 365.25 days .

2.) Moon ===> 1.) travels around the Earth

2.) Takes 27.3 days.

Answer:

4s

4p

4d

4f

these are the four quantum numbers

The solvents that can be utilised for proton NMR analysis are deuterium oxide, chloroform-d, and acetone-d6. This is due to the deuteration of all the aforementioned solvents.

What is meant by deuteration?

Deuteration refers to the action of adding deuterium to a molecule and chemical mixture.

What is the process of deuteration?

Chemical deuteration is subjecting complete molecules to fresh water (deuterium oxides) at high pressure and temperature in the presence of an acid catalyst, deuterating them, or using them as the construction blocks for the production of a desired molecule.

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Execute Order 66________________

The mass of LiOH needed to make a 300 mL of a solution with a pH of 11.33 is 0.015 g

We'll begin by calculating the pOH of the solution.

pH = 11.33

pOH =?

pH + pOH = 14

11.33 + pOH = 14

Collect like terms

pOH = 14 – 11.33

pOH = 2.67

pOH = –Log [OH⁻]

2.67 = –Log [OH⁻]

–2.67 = Log [OH⁻]

Take the as antilog of –2.67

[OH⁻] = antilog (–2.67)

LiOH(aq) —> Li⁺(aq) + OH⁻(aq)

From the balanced equation above,

1 mole of LiOH contains 1 mole of OH⁻

Therefore,

0.0021 M LiOH will also contain 0.0021 M OH⁻.

Molarity of LiOH = 0.0021 M

Volume = 300 mL = 300 / 1000 = 0.3 L

Mole = Molarity × volume

Mole of LiOH = 0.0021 × 0.3

Mole of LiOH = 0.00063 mole

Molar mass of LiOH = 7 + 16 + 1 = 24 g/mol

Mass = mole × molar mass

Mass of LiOH = 0.00063 × 24

Therefore, the mass of LiOH needed to prepare the solution is 0.015 g

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Answer:

0.0074 moles

Explanation:

We'll have to use this forumla: PV = nRT

P = Pressure (0.724)

V = Volume in liters (0.25)

n = moles

R = 0.0821

T = temperature in kelvins (25 + 273 = 298)

Our equation will look like this:

(0.724)(.25) = n(0.0821)(298)

0.181 = 24.4658n

Divide both sides by 24.4658 to isolate n

0.181/24.4658 = 24.4658n/24.4658

n = 0.00739808

Answer:

(n, l, m sub l, m sub s)

N: principle quantum number (1,2,3,4,etc)

l: angular momentum quantum number, the shape (l has to be at least 1 less than n, but can be 0 depending on n)

M sub l: magnetic quantum number (l determines this number)

M sub s: spin quantum number (can only ever be 1/2 or -1/2)

Explanation:

The principle, azimuthal, magnetic, and spin quantum numbers specify the principle shell, the shape of the orbital, the number of orbitals, and electron spin respectively.

The set of numbers that describes the position and energy of the electron are called quantum numbers. Four quantum numbers are principal, azimuthal, magnetic, and spin quantum numbers.

Principal quantum numbers (n) designate the principal electron shell of the atom and the most probable distance between the nucleus and the electrons. A larger value of the principal quantum number indicates a large distance between the electron and the nucleus.

The azimuthal quantum number (l) describes the shape of an orbital in which an electron is present. Its value is equal to the total number of angular nodes in that orbital.

The magnetic quantum number describes the total number of orbitals in a subshell and the orientation of these orbitals.  The value of the spin quantum number (s) offers the direction in which the electron is spinning and it has only two possible values +½ and -½.

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If the temperature remains constant, the new volume of the gas will be 1.973 m³

Initial volume of oxygen (V1) = 0.478 m³

Final volume of oxygen (V2) = ?

Absolute pressure (P1) = 4.13 atm

Final Pressure (P2) = 1.00 atm

Temperature = constant

To find out the final volume (V2) we will use the final equation

    V2 / V1 = P1 / P2

Rearrange it for V2

    V2 = V1 × (P1 / P2)

Put the values in the above equation

    V2 = 0.478 m³ (4.13 atm / 1.00 atm)

    V2 = 0.478 m³ × 4.13

    V2 = 1.974 m³

So the final volume of the gas will be 1.973 m³.

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Administrative agencies perform all tasks except handle appeals of hearings.

Administrative agencies are responsible for various functions, such as holding hearings, giving informal advice, and issuing regulations. However, they do not handle appeals of hearings, as this task falls under the jurisdiction of appellate courts or higher-level authorities within the administrative hierarchy.

These agencies focus on implementing and enforcing specific regulations, while appellate bodies review decisions made during hearings. Holding hearings and issuing regulations are integral parts of an agency's duties, and informal advice helps clarify regulatory requirements for individuals and businesses.

A government body with the authority to make rules that are more precise and technical than what can be done in a legislative setting to carry out directives from the legislature. Additionally, many administrative agencies are responsible for law enforcement.

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The ether C2H5OC2H5 has the following Lewis structure. The valence shell electrons of a molecule are depicted in a highly condensed manner in a Lewis structure.

C

|

H-C-H

|

O-C-H

|

H-C-H

|

H

Lewis structure, also referred to as electron-dot framework, is indeed a structural formula wherein the dots serve as placeholders for electrons; two dots between bonded ions signify a covalent link. Gilbert Newton Lewis, the man behind its 1916 introduction, gave it its name.

A molecule's valence shell electrons are shown in a very simple manner via a Lewis structure. It serves as a visual representation of how the electrons surrounding particular molecules' atoms are positioned. For bonds involving two atoms, electrons are displayed as "dots" or as a line.

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Answer:

The right option is the 4 one. nucleoid

Prokaryotic cells are simple cells that lack a definite nucleus and some membrane-bound organelles. Prokaryotic cells have a nucleoid region, which is an irregularly-shaped central region of the cell that contains the cell’s genetic information (DNA). Other organelles that can be found in prokaryotic cells include plasma membrane, cell wall, cytoplasm, and ribosomes.

Explanation:

Answer:

nucleoid

Explanation:

Answer:

Hello There!!

Explanation:

The answer is C: evaporation because evaporation is the process in which a liquid boils then evaporates and lastly becomes a gas.

hope this helps,have a great day!!

~Pinky~

According to the forces of attraction, when you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of evaporation.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

-1300

Explanation:

Answer:

-1300

Explanation:

trust

Answer:

The minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule. Pls mark as breinlest

To prepare 100ml of a 1.5m kbr solution. To find mass of kbr we need

we can use the formula:

mass = molarity x volume x molar mass

where molar mass of KBr is 119.00 g/mol.

So,

mass = 1.5 M x 100 ml x (119.00 g/mol) / 1000 ml/L

mass = 1.785 g

Therefore, 1.785 g of KBr is required to prepare 100 ml of a 1.5 M solution.

Potassium Bromide, sometimes known as KBr, is a salt that is commonly used as an anticonvulsant and sedative.

Other names for potassium bromide include Kalii bromidum, tripotassium tribromide, and bromide salt of potassium.

The odourless potassium bromide salt has a sharp, bitter salty flavour and is available as white crystals, colourless crystals, or white granular solids. Aqueous KBr solutions have a pH of 7.

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Answer

B. 11.2 grams

Explanation:

Molar mass of CaCl = 110.98 g/mol

Molar mass of KCl = 74.5513 g/mol

From the balanced chemical equation of the reaction given;

1 mole CaCl produced 2 moles KCl.

In grams;

(1 mol x 110.98 g/mol) CaCl produce (2 mol x 74.5513 g/mol) KCl, i.e

110.98 g CaCl produced 149.10236 g KCl,

Therefore, the grams of CaCl needed to produce 15.0 g KCl will be:

Therefore, 11.2 grams of calcium chloride are needed to produce 15.0 g of potassium chloride.

Iodine undergoes physical changes such as sublimation when heated and the color of iodine can change depending on its physical state.

The solution with the unheated iodine crystals turned violet, while the solution with the heated iodine crystals turned yellow.

The deposited substance on the bottom of the evaporating dish is iodine crystals.

Evidence that demonstrates that physical changes occurred during the experiment is the sublimation of iodine when heated and then condensation when cooled.

The original copper metal is a reddish-brown color but the copper metal turns black after heating.

The color of the liquid obtained after putting the unheated copper in the sulfuric acid is colorless while the color of the liquid obtained after putting the heated copper in the sulfuric acid is blue.

No. Copper conducts electricity and is relatively unreactive while copper(II) oxide does not conduct electricity well and is an oxidizing agent.

When iodine is heated, it undergoes a phase change, a physical change from a solid to a gas without passing through a liquid state.

The purple-black solid iodine crystals sublime into a purple vapor which then condenses into small solid crystals on a cool surface.

The color of the crystals on the evaporating dish bottom is the same as the color of the iodine crystals in the reagent bottle, which is purple-black.

When the samples were added to the two cyclohexane solutions, the colors of the solutions changed. The solution with the unheated iodine crystals turned a violet color, while the solution with the heated iodine crystals turned a yellow color.

The deposited substance on the bottom of the evaporating dish is iodine crystals.

Evidence that demonstrates that physical changes occurred during the experiment:

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Answer:

Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. Thus ventilators maintain conventional currents to keep the air fresh in the room.

Explanation:

The electron configuration refers to the way electrons are arranged in the energy levels of an atom. (a) Se, (b) K, (c) Mg, (d) Li.

The electron configuration of an atom refers to the way electrons are arranged in its energy levels. The energy levels are the various shells surrounding the nucleus. The electrons are arranged in these shells according to specific rules. Each shell can hold only a limited number of electrons, and the electrons fill up the shells in order of increasing energy.

The first shell can hold a maximum of 2 electrons, the second shell can hold a maximum of 8 electrons, and the third shell can hold a maximum of 18 electrons. Therefore, the electron configuration of Se is [Ar]4s²3d¹⁰4p⁴ where Se has 34 electrons; 2 are in the first shell, 8 are in the second shell, and the remaining 24 electrons are in the third shell. Similarly, the element corresponding to the electron configuration of K is potassium, Mg for magnesium and Li for lithium.

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Complete question is:

Identify the specific element that corresponds to each of the following electron configurations

(a) [Ar]4s²3d¹⁰4p⁴

(b) [Ar]4s¹3d¹⁰  

(c) [Ne]3s²

(d) [He]2s¹

Answer:

A i think is the answer

Answer:

partly ionic and partly covalent