zinc coatings on iron provide protection from corrosion of the iron in ordinary service. what is/are the mechanisms which are active in this coating/substrate pair?

Answer:

Hope this helps

Explanation:

hjnm

Calcium carbonate, CaCO3, decomposes to form calcium oxide, CaO, and carbon dioxide, CO2. The balanced chemical equation for this decomposition reaction is:

CaCO3 -> CaO + CO2

To determine the number of moles of calcium carbonate that react, you need to know the molar mass of calcium carbonate. The molar mass of calcium carbonate is 100.09 g/mol.

Now, you can use the molar mass of calcium carbonate to calculate the number of moles of calcium carbonate that react. To do this, divide the mass of calcium carbonate by its molar mass:

24.5 g CaCO3 / 100.09 g/mol = 0.2447 moles CaCO3

Therefore, 0.2447 moles of calcium carbonate react when 24.5 g of calcium carbonate decompose.

Answer:

a. glucose c. ribose b. adenine d. two phosphate groups user: all organisms need energy to perform different functions. cells are able to ...

Actual yield of the chemical reaction provided is 197.54g.

In chemistry, yield or reaction yield refers to a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage. The actual yield refers to the quantity of a product that is obtained from a chemical reaction. The calculated or theoretical yield refers to the amount of product that could be obtained from a reaction if all of the reactant converts to product.

Based on the equation:

U + 3Br2 → U Br6

The masses in the balanced chemical reaction are:

U = 238g

3Br2 = 3 x 160 = 480g

U Br6 = 718 g

The ratio of masses of Uranium to that of Bromine is less in the balanced chemical equation than that of in the given masses, hence Uranium is the limiting reagent. 100 g U will be consumed first and will act as a limiting reagent.

Percentage yield = Actual yield/ Theoretical yield *100

83 = Actual yield/ 238 *100

Actual yield = 197.54g

Note: The question is incomplete. The complete question probably is: U + 3Br2 → U Br6. What is my actual yield of uranium hexabromide if I start with 100 grams of uranium and 250 grams of bromine, and get a percent yield of 83%?

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The speed or velocity of the car after it has traveled 200 meters is 44.3 m/s.

The velocity or speed of the car is determined using the equation of motion in a straight line given below as follows:

v² = u² + 2as

where;

Solving for the speed or velocity of the car, v;

v = √ (u² + 2as)

v = √ (0² + 2 * 4.9 * 200)

v  = √ 3920

v = 44.3 m/s

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Complete question:

A race car starting from rest accelerates uniformly at a rate of meters per second. What is the car's speed after it has traveled 200 meters?

A. 1960 m/s

B. 62.6 m/s

C. 44.3 m/s

D. 31.3 m/s

The energy contained within covalent bonds in molecules is a type of potential energy called chemical energy.

What is a chemical?

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If The Bond Angle Between Two Adjacent Hybrid Orbitals Is 180 Hybridization is Sp2.

A space object appears to follow an orbit as it moves around another space object. A satellite is a spacecraft that orbits the planet. A natural satellites that matches the Earth nor moon is one possibility. Moons are satellites in the orbits of numerous nations. A man-made satellite, such as the Space Stations, provides an additional choice.

The positions of the electrons are dictated by the entire molecule when several atoms unite chemically to form a molecule, combining the atomic orbitals into molecular orbitals. The molecular orbitals are occupied by the electrons of the component atoms. There are two electrons in each orbital, and their spins vary. An atom's orbital is the area of space where an electron resides.

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The majority of the energy released in citric acid cycle reactions is conserved in the form of adenosine triphosphate (ATP).

What is citric acid cycle?
The Krebs cycle, also referred to as the TCA cycle or the citric acid cycle (CAC), is a set of chemical reactions that releases stored energy by oxidising acetyl-CoA, which is inferred from carbohydrates, fats, as well as proteins. Organisms a certain respire (as compared to organisms a certain ferment) use the Krebs cycle to produce energy, either through anaerobic or aerobic respiration. The cycle additionally supplies the reducing agent NADH and precursors of a few amino acids that are needed in a variety of other reactions. It may have originated abiogenically and became one of the earliest elements of metabolism given its central role in many biochemical pathways.

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The final liquid level of water is 27.76 mL after considering the 1.130 ounce of aluminum dropped in cylinder.

Chemically speaking, aluminum is a 13-atomic-number chemical element with the symbol Al. Aluminum's density is lower than that of the majority of common metals, being around one third that of steel. Due of its high affinity for oxygen, it develops a protective oxide coating on its surface when exposed to air. It has a strong visual resemblance to silver due to its color and sparkling ability to reflect light. It is soft, ductile, and non-magnetic. It only has one stable isotope. It is a post-transition metal that belongs to the boron group chemically and typically forms compounds in the +3 oxidation state, like other members of the family. Aluminum typically coexists with oxygen in nature in the form of oxides due to its strong affinity for oxygen. As a result, it is typically found in rocks in the Earth's crust rather than in the mantle and is hardly ever discovered as a free metal. After silicon and oxygen, it is the third most prevalent element on Earth.

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Radioactivity is a natural phenomenon by which a heavy unstable nucleus disintegrates into lighter and stable nuclei. The time after which the number of nuclei of original nucleus reduces to half is termed as half life.( t 1/2 )= 1.6 days.

We are given:

time taken to reduce the radioactive nucleus to (1/8)th of original number is t = 4.8 days

Finding the half life, (t1/2)

Let n be the number of half lives, after which number of nuclei reduces to (1/8)th of original number, therefore

(1/2)n =1/8

n=3

Number of half lives passed in 4.8 days is n = 3, therefore half life is calculated as:

t1/2 =t/n

t1/2 =4.8 days/3

t1/2 =1.6 days

A half-life is the amount of time it takes for something to go from 100% to 50%. The phrase is most frequently used in reference to radioactive decay, which happens when energetic atomic particles that are unstable lose momentum. There are 29 elements that have been shown to be capable of going through this process.

Knowing an element's alpha, beta, or gamma decay can help someone properly protect their body from excessive radiation. Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half.

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At constant temperature, 7.72 L of cl2 at 458 mmHg is compressed to 3.75 L. The final pressure of Cl₂ is 942.86 mmHg.

To calculate the final pressure we can use the boyle's law

According to Boyle's Law, the relationship between a gas's volume and pressure is inverse. In other words, it says that as long as the number of gas moles remains constant, the product of pressure and volume for an ideal gas at constant temperature remains constant. P1V1=P2V2, where P1 is the first pressure, V1 is the first volume, P2 is the second pressure, and V2 is the second volume, is one way to state it.

So, the final pressure of Cl₂ can be calculate as follows:

P1V1=P2V2

458mmHg x 7.72 L = P2 x 3.75 L

P2 = 458mmHg x 7.72

                 3.75 L

P2 = 942.86 mmHg

Therefore, at constant temperature, 7.72 L of cl2 at 458 mmHg is compressed to 3.75 L. The final pressure of Cl₂ is 942.86 mmHg.

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The biomolecule with this ratio is water (H2O).

What is biomolecule?
A loose term for molecules found in organisms and necessary for one or more typical biological processes, including such cell division, morphogenesis, as well as development, is "biomolecule" or "biological molecule." Large macromolecules (as well as polyelectrolytes) like proteins, carbohydrates, lipids, as well as nucleic acids, in addition to small molecules like primary metabolites, secondary metabolites, and natural products, are all examples of what is referred to as a biomolecule. Biological materials is a more inclusive term for this category of materials. Living organisms depend on exogenous biomolecules, such as certain nutrients, to survive even though endogenous biomolecules, which are produced inside the organism, are frequently necessary.

Water is made up of two hydrogen atoms bonded to one oxygen atom. This bond forms a covalent bond, with the oxygen atom sharing its two outer electrons with the two hydrogen atoms. This results in a ratio of 1 carbon atom to 2 hydrogen atoms to 1 oxygen atom.

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The height of a column of liquid in a barometer if the density of the liquid is 0.99 g/ml and the local atmospheric pressure is 0.95 bar is 0.791 m,

As we know that the relation of pressure and height is given as,

P = hρg

Where,

h is the height of the column

P is the pressure

ρ is the density

g is the acceleration due to gravity

Given,

P = 0.95 Bar

h = ?

ρ = 0.99 g/ml

Substitute the values to obtain the value of h,

∴ h = P/ρg

⇒ h = 0.95 Bar/(0.99 × 0.98)

⇒ h = 0.791 m

Hence, the height of a column of liquid in a barometer if the density of the liquid is 0.99 g/ml and the local atmospheric pressure is 0.95 bar is 0.791 m.

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The amount of moles in a sample should be multiplied by the avagadro number (6.0221023 atoms) to determine the number of particles.

Any pure substance's mass and molecular count can be converted using Avogadro's number. If you are given a sample's mass (such as that of a snowflake), convert it to moles using Avogadro's number, and then use moles to represent molecules.

First, determine which element and how much of it are present in the issue.

Step two is to calculate the element's molecular mass.

Step 3: Calculate the number of moles in the mass by dividing it by the mass of one mole.

the formula is: moles = specified mass mole mass

Step 4: Multiply the amount of moles you calculated in Step 3 by Avogadro's number to get how many atoms are contained in that amount.

Avogadro's number = number of atoms + number of moles

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Process that is spontaneous is : d) mixture of two gases separating into pure compounds.

In thermodynamics, spontaneous process is that process which occurs without any external input to the system. A more technical definition can be the time-evolution of a system in which it releases free energy and moves to a lower, more thermodynamically stable energy state.

We can assess the spontaneity of  process by calculating entropy change of the universe. If ΔSuniv is positive, then we can say that the process is spontaneous. As spontaneous processes are characterized by decrease in  system's free energy, they do not need to be driven by an outside source of energy.

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The emitted particle is called photon which is responsible for the different color emission.

When an electron jumps from the higher energy orbit to a lower energy orbit, it releases energy in the form of photons (according to the particle theory of light), this is called photon emission.

The released photons will have different wavelengths and frequencies due to which photons will have different energies and color.

Like in chemical compounds, Heated compounds have acquired energy in the form of thermal energy. This thermal energy, if it is enough, excites electrons in any major atom in a compound or any singular lone atom so that the compound reaches one of its accessible excited states. This event is called an electronic excitation, and it leaves the compound less stable than in its ground state.

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The half-life of Tylenol is 3.999, after getting filtered by the liver in exponential form.

What is Half-life?

The amount of time (half-life, [tex]t_{1/2}[/tex]) needed for a substance's quantity to decrease to half of its initial value. In a broader sense, the term is used to describe any exponential decay. In biology, the half-life of medications and other substances in the human body is considered in the medical sciences.

What is the Liver?

The liver is a significant organ in vertebrates and is responsible for detoxification as well as the production of the proteins and biochemicals required for growth and digestion. It is situated beneath the diaphragm in the right upper quadrant of the abdomen. It also controls how much glycogen is stored, breaks down red blood cells, and makes hormones.

What are the calculations?

N(t) = No × (1/2) t/t ½  (Formula for half-life)

Where,

N(t) = substance remaining

No = Initial quantity = 400

t = time elapse = 12

t ½  = Half-life

Here,

No =400

t = 12 hours

N × (12) = [tex]400 * (\frac{1}{2}) ^{\frac{12}{\frac{1}{2} } }[/tex]

50 = 400 (1/2)

Further simplifying = t ½  = 3.999.

Hence,  the half-life of Tylenol is 3.999.

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For the coin that is being flipped straight up we have the velocity at  top of its trajectory (at the maximum height) will be 0.

The velocity of the coin at the top of its trajectory is zero because in maximum height the ball will stop and then will start to move down.

The acceleration will be zero if there is no variation in  velocity of the object. At the highest point, the object has the  no  or the zero kinetic energy where all of its kinetic energy is converted into potential energy . The velocity of  coin will be momentarily zero when it reaches its maximum height.

Therefore the velocity will be zero and the object does not accelerate.

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Response to inquiry A: We choose a carbon chain with the greatest number of carbon atoms according to the IUPAC nomenclature standard. Since there are 4 carbon atoms in this chain, butane is the parent molecule. The double bo is present in the molecule.

The Interdivisional Committee on Terminology, Nomenclature, and Symbols and Division VIII - Chemical Nomenclature and Structure Representation are two IUPAC groups that play major roles in this activity. IUPAC is the widely acknowledged authority on chemical nomenclature and terminology. One of IUPAC's main activities is the development of recommendations to establish unambiguous, uniform, and consistent nomenclature and terminology for particular scientific fields. These recommendations are typically presented as glossaries of terms for particular chemical disciplines, definitions of terms relating to a group of properties, nomenclature of chemical compounds and their classes, terminology, symbols, and units in a particular field, classifications and uses of terms in a particular field, and co-references. The Recommendations are printed in the Pure and Applied journal of the IUPAC.

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The ionic link that held sodium and chloride ions together is broken when water molecules force the ions apart. When the salt compounds are separated, water molecules surround the sodium and chloride atoms.

The ionic link that held sodium and chloride ions together is broken when water molecules force the ions apart. As the salt compounds are separated, water molecules surround the sodium and chloride atoms.

In terms of energy, a solid can be dissolved into a solvent to create a solution in three steps.

Thus, this way, salt dissolution takes place.

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The option d) is correct i.e. 1,2 - dimethyl cyclohexane which can exist as cis-trans isomers.

What are isomers?

Isomers are molecules that have the same chemical formula but different structures. This means that they contain the same number of atoms of each element, but they are arranged differently. Isomers can be divided into two categories: structural isomers, where the atoms are connected in different ways, and stereoisomers, where the atoms are connected the same way but arranged differently in space. An example of structural isomers is the difference between butane and isobutane, which are both made up of 4 carbons and 10 hydrogen atoms, but have different structures. An example of stereoisomers is the difference between D-glucose and L-glucose, which are both C6H12O6, but their atoms are arranged differently in space.

The compounds which same molecular formula and different connections are constitutional isomers.

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The coefficients in front of Bro3-(aq) and Br-(aq) when the equation( BrO3 -(aq) + 5 Br-(aq) + 6H+(aq)→ 3Br2(aq) + 3H2O (l)) is balanced in an acidic solution is : 1, and  5 respectively.

A balanced equation is an equation for a chemical reaction in which number of atoms for each element in the reaction and the total charge are  same for both reactants and the products. Both the mass and charge are balanced on both sides of the reaction in a balanced equation.

A balanced equation is a chemical equation in which mass is conserved and there are equal number of atoms of each element on the both sides of the equation.

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1) The noble gas is element 4.

2) The element that has the largest atomic radius is element 4.

3) The element that would form a +2 cation is element 3.

We define the ionization energy as the energy that we need so as to remove an electron from an atom. If the electron that we are referring to here is the first electron that is removed from the atom then we can call it more specificaly the first ionization energy. There are other ionization energies as more electrons are removed from the atom.

I see that it is important to say a couple of things about the noble gases that would help us decide on the answer. We know that the noble gas has to do with an element that is found in the eighteenth group of the periodic table and does has a complete octet.

This stability means that it is quite difficult to remove electrons from this atom hence the atom is quite stable.

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The wavelength of the light is 1200 nm and it is longer than red light.

The term wavelength has to do with the distance that has been traveled by a wave. We know that a wave is a disturbance on a medium that transfers energy and in this case, the red light is part of the electromagnetic spectrum of light.

We have the information from the question that the wavelength of radiation with a frequency of 2.50 x 10^15 HZ and the task that we have here is that we should be able to obtain the wavelength of the frequency that is given.

We then have;

c = λf

c = speed of the wave

λ = wavelength

f = frequency

Then;

λ = 3 * 10^8/ 2.50 x 10^15 HZ

λ =  1.2 * 10^-7 or 1200 nm

Since the wavelength of red light is 620 - 720 nm hence this is definitely longer than red light.

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The total mass of 197.25 g is made up of 100 g of 100 L of water, 20 g of salt, and 77.25 g  beaker. Mass of empty beaker=mass of the content, By the Law of Conservation of Mass. 197.25 g - 77.25 g or 120 g.

According to the rule of conservation of mass, the combined mass of all reactants and products in a closed chemical reaction system will be equal. In other words, if 10g of reactant A and 5g of reactant B combine, the resulting product, AB, will weigh 15g. Mass is therefore retained.

As a result, according to the law of mass action, the equilibrium constant, at a given constant temperature, is equal to the product of the reactant concentrations, each raised to the corresponding stoichiometric coefficients, divided by the product of the concentration of products, raised to the respective.

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For a solute to be quantified, one must know its mass or moles. By multiplying the grams of solute per gram of solution by 100, one may get the mass percent of a solution.

Because the overall amount remains constant, the starting concentration times the initial volume will equal the final concentration times the final volume. As a result, C1V1 = C2V2, which is an equation.

35 mL of ethanol and 65 mL of water combined to make a solution with a volume percent by volume of 35%. The mass or volume of solute required may also be determined if you know the concentration.

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Answer:

iamprogrbow (check explanation)

Explanation:

Kilograms

Meters

Liters

Moles

SI Units

Scientific Notation.

Expanded Form

Metric Prefixes

Significant Figures

Magnetic

Conductive

Flammability

Reactive

Solubility

Mass

Physical Changes

Chemical Changes

States of Matter

Solid

Isotope

Isotope Symbol

Isotope Name

Charge

Octet Rule

Chemistry

Matter

Vocabulary Words (120 Total)

Particle Diagrams

Physical Properties

Chemical Properties

Intensive Properties

Extensive Properties.

Color

Luster

Length

Volume

Density

Radioactive

Toxic

Ductile

Malleable

Brittle

Metallic Bonding

Liquid

Average Atomic Mass

Ions

Shared Electrons

Transferred Electrons

Triple Bond

Gas

Phase Change

Melting

Freezing

Vaporization

Condensation

Sublimation

Deposition

Pure Substance

Mixture

Element

Compound

Homogeneous

Heterogeneous

Periodic Table

Demitri Mendeleev

Henry Moseley

Group

Period

Atom

Periodic Trends

Atomic Radius

Ionization Energy

Double Bond

MetalM

Nonmetal

Metalloids

Alkali Metals

Alkaline Earth Metals

Transition Metals

Halogens

Noble Gases

Lanthanides

Actinides

John Dalton

JJ Thomson

Ernest Rutherford

Niels Bohr

Subatomic Particles

Proton

Neutron

Electron

Nucleus

Energy Level

Emission Spectrum

Quantum Model

Metallic Bonding

Single Bond

Atomic Number

Atomic Mass

Valence Electrons

Lewis Dot Diagrams

Lewis Dot Structure

Ionic Bonding

Covalent Bonding

Sublevels

Orbitals

Orbital Diagram

Electron Configuration.

Aufbau Principle

Pauli Exclusion Principle

Hund's Rule

Electronegativity

Bohr Model

Exited State

Ground State

Photon

Light

Atomic Symbol

Cation

Anions

Delocalized Electrons.

When, where, and how much genes are expressed in each cell are all regulated by the histone proteins and epigenetic elements.

Histone proteins:

The eukaryotic cells include histone proteins, which serve two purposes. They support preserving DNA in a compact state and control how flexible and tight DNA strands are, which controls how genes are expressed.

Epigenetic factors:

The substances known as epigenetic regulators alter the gene to control how the gene expresses itself. These modifications neither result in mutations nor are they heritable. These are the transient alterations, such as DNA remodeling, methylation, and alkylation.

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A corn growing into an adult tree will take the longest time to observe. Hence, the third option will be correct.

Thus the longest time is taken by the corn tree to grow into adult tree that is of 55 to 95 days.

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