In each of the following reactions, identify which element is being ordized and which is being reduced by assigning oxidation numbers. (Enter your answer using the format +1 and -2.) (a) Pb(s) + CO(g) -- Pb(s) + CO2(9) Oxidized element initial oxidation number final oxidation number Reduced element Initial oxidation number final oxidation number (6) 2 Zn(s) + O2(g) + 2 Zno(s) Oxidized element Initial oxidation number Tinal oxidation number Reduced element Initial oxidation number final oxidation number (c) Fe(s) + CuSO4(a) Feso(0) + Cu(s) Oxidized element initial oxidation number final oxidation number Reduced element Initial oxidation number final oxidation number (d) 2 Al(s) + 3 12(8) - 2 Allg(s) Oxidized element initial oxidation number final oxidation number Reduced element Initial oxidation number final oxidation number

Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

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Mass of each element in one mole of sulfuric acid: Mass of hydrogen = 2 × (1.008) = 2.016 g/mol. Mass of sulfur = 1 × 32.06 = 32.06 g/mol.

...

What is the percent composition of NaHCO₃?

Element Percent Composition

Sodium (Na) 27.367%

Hydrogen (H) 1.2%

Carbon (C) 14.298%

Oxygen (O) 57.14%

Answer:

deez

Explanation:

The microscopic interface asymmetry of grown semiconductor heterostructures.

The dispersion of restricted electrons. beginning from a multiband envelope formulation we practice matrix perturbation theory to derive specific expressions. Interface asymmetry, which in the conduction band Hamiltonian appear as a warping and a spin-splitting term. The warping term consequences in an inequivalence of the dispersion.

The microscopic interface asymmetry of grown semiconductor heterostructures that gives upward thrust to heavy-light hole coupling even at 0 in-plane wave vector, modifies also the dispersion of restricted electrons. beginning from a multiband envelope method we practice matrix perturbation principle to derive explicit expressions as a result of this interface asymmetry, which inside the conduction band.

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Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

A mixture of He Ne and N2 gases has a pressure of 1. 943 atm if the pressure of He and Ne are 0. 137 atm and 0. 566 atm respectively.  The partial pressure of N2 in the mixture is 1.240 atm.

To find the partial pressure of N2 in the mixture of He, Ne, and N2 gases having a pressure of 1.943 atm with the pressure of He being 0.137 atm and that of Ne being 0.566 atm, we must first calculate the pressure of N2.

Let's assume the pressure of N2 in the mixture is Pn2.

Since the total pressure is equal to the sum of partial pressures of gases, we can write:

Ptotal = PHe + PNe + PN2 (equation 1)

We have the values for Ptotal, PHe, and PNe from the problem, which are 1.943 atm, 0.137 atm, and 0.566 atm respectively.

Substituting the values of Ptotal, PHe, and PNe in equation 1, we get:

Pn2 = Ptotal - PHe - PNe

Pn2 = 1.943 atm - 0.137 atm - 0.566 atm

Pn2 = 1.240 atm

Therefore, the partial pressure of N2 in the mixture is 1.240 atm.

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97.6% of the molecules in the mixture are monatomic. The specific heat ratio y is defined as the ratio of the heat capacity at constant pressure to the heat capacity at constant volume, and it is related to the degrees of freedom of the molecules in the gas.

For a monatomic gas, each atom has three degrees of freedom (translational motion in three directions), while for a diatomic gas, each molecule has five degrees of freedom (three translational and two rotational). Therefore, the specific heat ratio for a mixture of monatomic and diatomic gases can be expressed as:

y = (f1 + f2) / (f1 + (5/3) * n2)

where f1 and f2 are the degrees of freedom of the monatomic and diatomic gases, respectively, and n2 is the fraction of diatomic molecules in the mixture. Rearranging this equation, we can solve for n2:

n2 = (3 * (y - 1) - f1) / 5

Since we know that y = 1.62, we need to determine the degrees of freedom of the monatomic gas, f1. Since each atom has three degrees of freedom, we can assume that the monatomic gas has f1 = 3. Plugging in these values, we get:

n2 = (3 * (1.62 - 1) - 3) / 5 = 0.024

Therefore, the fraction of diatomic molecules in the mixture is 0.024, which means that the fraction of monatomic molecules is:

1 - n2 = 1 - 0.024 = 0.976

So, approximately 97.6% of the molecules in the mixture are monatomic.

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A geometrical isomer with like groups located on opposite sides of the metal atom is denoted with the prefix trans-. So fifth option is the correct answer.

Isomers are molecules with the same chemical formula but different spatial arrangements. In coordination complexes, such as transition metal complexes, geometrical isomerism can occur when ligands are arranged differently around the metal atom.

The term "trans-" is used to describe an isomer where two identical ligands are positioned on opposite sides of the metal atom. This arrangement is characterized by a symmetrical configuration across the metal-ligand bonds.

In contrast, the prefix "cis-" is used when the like groups are located on the same side. The prefixes bis- and tetrakis- are used to indicate the number of ligands, while d- denotes a coordination complex with two ligands.

So fifth option is the correct answer.

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2 asymmetric carbon atoms are present in the molecule shown.

Asymmetric carbon atoms, also known as chiral carbon atoms or stereogenic carbon atoms, are carbon atoms that are bonded to four different groups or atoms. They are important in organic chemistry because they give rise to molecular asymmetry and the existence of enantiomers.

The presence of an asymmetric carbon atom in a molecule leads to chirality, which is the property of having two non-superimposable mirror image forms (enantiomers). Enantiomers have identical physical and chemical properties, except for their interaction with other chiral molecules, such as in biological systems.

The existence of enantiomers is significant because they can exhibit different biological activities, pharmacological effects, and reactivities. For example, one enantiomer of a drug may be therapeutically effective, while its enantiomer could be biologically inert or even produce adverse effects.

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Monomers of condensation polymers must contain two functional groups so that each monomer can link with two other monomers

What are condensation polymers?

whar ar esters?

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Answer:

If an object is moving at a constant speed in a constant rightward direction, then the acceleration is zero and the net force must be zero.

According to Aristotle, a force is anything that causes an item to move "unnaturally." One of the first scientists to explore force and gravity was Sir Isaac Newton. A push or a pull is all that constitutes a force. It might be compared to pushing or pulling on an object.

An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.The definition of force in physics is. The push or pull on a mass-containing item changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

The net force is:

Fnet = Fr - Fl = 10 - 8 = 2N

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Answer:

51.75 moles

Explanation:

2NH3   ⇒   N2   +   3H2

2           :      1      :      3        

34.50                                  (moles)

⇒ \(n_{H2\) = 34.50 × 3 ÷ 2 = 51.75 (moles)

It is stable to most peptide synthesis conditions, such as acidic or basic conditions, allowing for the synthesis of long peptide chains without unwanted side reactions.

Dansylalanine is synthesized by reacting N-dansyl chloride with the amine group of Boc-L-alanine.

The Boc group on compound 1 in the synthesis of Dansylalanine most likely functions to protect the α-amine group of L-alanine from N-dansylation.

The α-amine group of L-alanine is a nucleophilic center that is highly reactive.

It readily reacts with electrophiles such as the N-dansyl group in N-dansyl chloride, which could have led to the formation of unwanted products if left unprotected.

The presence of the Boc group in Boc-L-alanine shields the α-amine group, making it less reactive towards electrophiles.

Therefore, when N-dansyl chloride is added to Boc-L-alanine, it reacts selectively with the carboxylate group, forming a stable amide bond with the α-amine group protected.

Once the reaction is complete, the Boc group can be removed by treating the product with an acid, unmasking the α-amine group and revealing the desired dansylalanine.

The use of the Boc group as a protecting group in peptide synthesis has become prevalent because of its stability and ease of removal.

It is stable to most peptide synthesis conditions, such as acidic or basic conditions, allowing for the synthesis of long peptide chains without unwanted side reactions.

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Answer:: 1100 j

Explanation:

Solid aluminum has a specific heat capacity of 0.90 J/ gK joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K is 11.080 J

Heat is the transfer of kinetic energy from one medium or object to another from an energy source to a medium or object

Here given data is

Specific heat capacity = 0.90 J/gK

Temperature = 300. K to 350. K = 350 - 300 = 50 K

Mass =  24.0 grams

We have to calculate the heat = ?

Q =mCΔT

Q =  24.0 grams× 0.90×50 K

Q = 11.080 J

11.080 J  heat are absorbed to raise the temperature

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The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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1. ENDOTHERMIC
2. EXOTHERMIC
3. ENDOTHERMIC
4. EXOTHERMIC
5. INPUT OF HEAT ENERGY
6. ENDOTHERMIC
7. EXOTHERMIC

Answer to question 3:
Q = (200g) x (1 cal/g°C) x (100.0°C - 24.0°C) = 15200 calories

Answer to question 6:
The can filled with water should have the greatest change in temperature after five minutes.

Answer to question 7:
Cork would be the best choice for an insulator as it has low thermal conductivity and can trap air pockets, which helps to slow down the transfer of heat.
1. Endothermic processes:
- Dry ice (CO2) subliming
- The input of heat energy
- Vaporizing a block of iron
- Ice melting

2. Exothermic processes:
- Condensing of H2O on the side of a glass
- Water freezing
- Soot being deposited on the walls inside a chimney
- The release of heat energy

Question 5:
To calculate the heat required, use the formula q = m x C x ΔT.
q = 200g x 1 cal/g x (100°C - 24°C) = 200g x 1 cal/g x 76°C = 15,200 calories. So, the answer is 15200 calories.

Question 6:
The can with iron filings should have the greatest change in temperature after five minutes, as metals generally have a higher conductivity and lower specific heat capacity.

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The migrants of a charged particle up against such a concentration gradient is connected to the process that Na+-NQR catalyses in vivo.

An electrochemical Na+ gradient is produced by the NADH-ubiquinone oxidoreductase (Na+-NQR), which pumps Na+ and transfers electrons from NADH to ubiquinone. This gradient is necessary for bacterium enzymes that need energy.

The respiratory system of V. cholerae has an oxidative sodium pump called the Na+-translocating Nicotinamide adenine dinucleotide phosphate oxidoreductase (NQR). In addition to facilitating the movement of Na+ across the membrane, NQR stimulates the electron movement from NADH to ferredoxin (13).

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Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

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Answer:

People wanted to settle there because it had good living conditions. There was rich soil, and lots of water sources.

I hope this helps!

The family of elements that all the other elements are trying to emulate in their electronic structure is the noble gas elements.

Noble gases is the general name given to elements in group 8 of the periodic table of elements. They are otherwise known as inert gases because they are unreactive ordinarily.

Inert gases are unreactive because they have 8 valence electrons. In other words, their outermost shells are completely filled and this makes them highly stable. They are said to be in an octet state.

Octet state is what other elements are trying to achieve in their electronic structure. Not having a completely filled outermost shell in their atoms makes them relatively unstable and reactive. This is why elements form ions and combine with other ions to form bonds.

In other words, the family of elements that other elements try to emulate in their electronic structure is the noble gas family or group 8 elements.

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The monobrominated compounds produced when 2-propyl-1-pentene is treated with NBS and UV light irradiation are the compounds that contain a bromine atom bonded to a single carbon atom within the 2-propyl-1-pentene molecule.

When 2-propyl-1-pentene undergoes bromination using NBS (N-bromosuccinimide) and UV light, the reaction occurs via a radical mechanism. This leads to the substitution of a hydrogen atom with a bromine atom, resulting in the formation of monobrominated compounds.

To determine the specific monobrominated compounds and their stereoisomers, it is necessary to analyze the structure of 2-propyl-1-pentene and consider the possible sites of bromination. 2-propyl-1-pentene has multiple carbon atoms that could potentially undergo bromination, leading to different structural isomers.

By introducing a bromine atom at various positions within the 2-propyl-1-pentene molecule, different monobrominated compounds can be formed. These compounds may exhibit stereoisomerism if there are chiral centers present in the original molecule.

To provide a comprehensive answer, the specific structures of the monobrominated compounds and their stereoisomers resulting from the reaction would need to be analyzed and described.

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Static charge is developed within a body temporarily with an induced polarization by rubbing on his leg . Electrons are exchanged from his hand  to the door when touched .

When two materials rub against each other in which one to be  good conductor, they will attract by the induced polarization. Rubbing causes the free electrons in the condutor to be transferred towards the surface in contact.

This will cause a deformation that, the random charges in the material get polarized where the electrons from one surface will repel to the opposite pol and positive charges will align in a pole close to the charged body.

This charge separation causes the positive pole of the metal gets attracted into the hand. Hence, the electrons from the hand move to the positive pole of metal and the spark  generate in the opposite direction.

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NH3

Why are you using brainly for this simple question? Search history being checked?

Answer:

\(NH_{3}\)

Explanation:

Structure and Formula of Ammonia

Its chemical formula is NH3 and the molar mass is 17.03 g/mol. It is a compound of hydrogen and nitrogen.

The validity of the statements are as follows:
1. True

2. True

3. False

4. True

5. False

6. False

7. True

8. True

9. False

10. True

11. False

12. False

13. True

14. True

15. False

Food scientists are using techniques such as irradiation and pulsed electric field technology to extend the shelf-life of food, while artificial flavors can be created to mimic the taste of natural foods, as done by Givaudan, the world's largest flavorings manufacturer.

Here are the correct responses to the statements:

1. True: Bursts of high-voltage electricity can kill bacteria such as E. coli and salmonella.

2. True: Food scientists can copy the flavor of natural foods using artificial alternatives.

3. False: The shelf-life of food refers to how long the product can be stored before it becomes unfit for consumption, not the price.

4. True: Scientists refer to artificial flavor components as "nature identical chemicals."

5. False: The statement mentions that Givaudan has produced 200 synthetic flavors for strawberry, not 300 flavors for a real banana.

6. False: Bacteria like salmonella and E. coli are harmful and can cause food spoilage, so they do not extend the shelf-life of food.

7. True: Food manufacturers aim to extend food freshness to serve consumers and increase profits.

8. True: Pulsed electric field technology can give food a fresher appearance even for an extended period.

9. False: Synthetic flavors are not inherently natural; they are artificial.

10. True: Irradiation involves exposing a product to an acceptable level of gamma ray radiation.

11. False: A real banana has 225 natural flavor components, not 200.

12. False: The Swiss firm Givaudan is the world's biggest flavorings manufacturer but does not exclusively supply irradiated food.

13. True: Fresh foods exposed to bursts of high-voltage electricity can stay fresh longer.

14. True: Food companies invest significant funds in research to find ways to prolong the shelf-life of food.

15. False: The name of the vice president mentioned is Dr. Heini Menzi, not Dr. Heinz Menzi. The location mentioned is outside Zurich, not specifically in Zurich.

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Answer:

2.691*10^6 g

Explanation:

Answer:

its a  hammer falling off a table

Explanation:

i think its cause the gravitational energy gets converted to kinetic energy when its falling down

The correct answer is a hammer falling off a table.

When the hammer falls off a table, the potential energy contained in the hammer is transferred to kinetic energy.

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Answer: I don’t know lol

Explanation:  I am so sorry I thought this was easy

Answer:

Ant.

Explanation:

The dog would be the most frantic, when all are compared at an equal speed of 30 mph. An ant of such strength, has six jointed legs and has an exoskeleton. An Ant of such size(mass) and weight would have take off with better traction too(6 legs). So the Ant would have the greatest kinetic energy. Also it would take turns while fleeing from the wildfire, while running at almost 30 mph while the other animals wouldn't come that close.

It is technically and literally illogical to say an ant can do 30 mph in its regular size.

Dont believe me? Watch ants scurrying away when threatened and taking turns and U-turns. Six legs offer more energy while fleeing by instinct. Literally six legs at 30 mph. Crazy!

The formula for the edge length of the face-centered cubic unit cell based on the radius (r) of the atom is: a = (6r) / \(\sqrt{2}\). In a face-centered cubic (FCC) unit cell, atoms are located at the corners and the centers of each face of the cubic unit cell. To find the formula for the edge length of an FCC unit cell based on the radius (r) of the atom:

1.   Consider a diagonal across the face of the cubic unit cell, which includes the following atoms: one corner atom, one face-centered atom, and another corner atom.
2.   In an FCC unit cell, the face-centered atom touches the two corner atoms, so the diagonal across the face can be expressed as the sum of the diameters of these three atoms (2r each).
3.   The diagonal across the face can also be expressed using the Pythagorean theorem: the square of the diagonal equals the sum of the squares of the edge length (a) and the height of the triangular face formed by the edge length and the diagonal (also a, as the face is a square). So, the diagonal equals \(\sqrt{(a^2 + a^2)}\) or a\(\sqrt{2}\).
4.   Set the sum of the three atom diameters equal to the diagonal across the face: 2r + 2r + 2r = a\(\sqrt{2}\).
5.   Simplify the equation: 6r = a\(\sqrt{2}\).
6.   Solve for the edge length (a): a = (6r) / \(\sqrt{2}\).

So, the formula for the edge length of the face-centered cubic unit cell based on the radius (r) of the atom is: a = (6r) / \(\sqrt{2}\).

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Answer:

Glucose will enter the cell through osmosis.

Explanation:

Diffusion causes molecules to move from high concentration to low concentration, so the glucose molecules outside the cell will move through the membrane to inside of the cell.