Pleaseee help now ASAP please

The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.

The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that  “the total mass of the products is exactly equal to the total mass of all the reactants”

Thus, The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

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Because the dipole moment of one polar bond does not cancel out the dipole moment of additional polar bonds, CH₃Cl molecules are polar.

The symmetrical molecule known as carbon tetrachloeide has a consistent tetrahedral structure. As a result, the bonds' polarises cancel out, making the molecule non-polar. The geometry of methyl chloride, on the other hand, is irregular because it has one C-Cl link.

Because the Cl atoms have an electron-withdrawing action, the C-H bond in CHCl₃ is very polarised. With ô+ H and ô- Cl, CHCl₃ exhibits a sizable dipole moment. There is no dipole moment in CCl₄. Despite the fact that each C-Cl bond is somewhat polar, the molecule's tetrahedral structure cancels out all of the bond dipoles.

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One of a substance's defining characteristics is density.

A substance's density is one of its distinguishing qualities. A material's density is determined by how much space a given amount of the substance occupies relative to its mass (volume).

A substance's density is defined as its mass (m) per unit volume (V). Because density is an intensive quality, it does not change as the amount of a material changes.

Given:

[tex]$$\begin{aligned}& \text { Density }=19.3 \mathrm{~g} / \mathrm{cm}^3 \\& \text { Mass }=0.715 \mathrm{k} \mathrm{g} \times \frac{1000 \mathrm{~g}}{1 \mathrm{~kg}}=715 \mathrm{~g}\end{aligned}$$[/tex]

Equation

[tex]$\text { density }=\frac{\text { mass }}{\text { volume }}[/tex]

Rearrange the equation to isolate volume and solve.

[tex]$\text { volume }=\frac{\text { mass }}{\text { volume }}$$[/tex]

[tex]$\text { volume }=\frac{715 g A u}{19.3 \frac{q}{c m^3}}=37.0 \mathrm{~cm}^3 \mathrm{Au}$$[/tex]

Sides of the Cube

Since all sides of a cube exists equivalent, the volume of a cube is [tex]$\mathrm{s}^3$[/tex], where s exists one side. If you contain the volume of the cube, you can take the cube root of the volume to estimate the value of each side of the cube.

Each side [tex]$=\sqrt[3]{37.0 \mathrm{~cm}^3} \approx 3.332 \mathrm{~cm}$[/tex]

The complete question is;

The density of gold is [tex]19.3 \mathrm{~g} / \mathrm{cm}^3$[/tex]. What is the volume, in [tex]$\mathrm{cm}^3$[/tex], of a sample of gold with mass [tex]$0.715 \mathrm{~kg}$[/tex]? If this sample of gold is a cube, how long is each edge in [tex]$\mathrm{cm}$[/tex] ?

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The number of moles in 15.5g of silicon dioxide is 0.258moles.

The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

moles = mass ÷ molar mass

Moles is the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities.

Molar mass of silicon dioxide is 60.08 g/mol

moles = 15.5g ÷ 60.08g/mol

moles = 0.258moles

Therefore, 0.258moles is the amount of moles in 15.5g of silicon dioxide.

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An adjustable-volume micropipette with a range of 0.5-10 μL would be the most accurate for dispensing 125 μL of solution.

What is the micropipette ?

A micropipette is a precision instrument used to accurately measure and transfer very small volumes of liquid, typically between 0.5 µL and 10 mL. It is commonly used in laboratories to prepare samples for chemical analysis and in medical applications to dispense precise amounts of medication. The micropipette is composed of a plunger, a tip, and a cylinder. The plunger is used to draw liquid into the tip, and the cylinder is used to release the liquid. The micropipette is usually operated using a thumbwheel or a push button that controls the plunger. The tip of the micropipette is designed to fit a range of different sized microtubes, allowing for accurate and repeatable transfer of liquids. The micropipette can be calibrated for accuracy, making it an invaluable tool for laboratories that need precise measurements of liquids.

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Following is the classification of monosaccharides as aldose or ketose and structures as the α or β form.

The main distinction between alpha and beta anomers is that the hydroxyl group at the anomeric carbon in the former is in cis to the exocyclic oxygen at the anomeric center, while the latter has the hydroxyl group in trans.

If the substituent off the anomeric center in a Fischer projection is on the same side as the configurational (D- or L-) carbon's oxygen, it is the —anomer. It is the -anomer if it is pointed in the other direction.

18.5

A) Ketose

B) Aldose

C) Ketose

D) Aldose

E) Aldose

18.11

A) α form:

B) β form:

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The chair structure I has the trans confirmation and the chair structure II has the cis confirmation.

A particular structure can have two isomers, namely, the cis and the trans isomers. The confirmation is said to be cis confirmation when both the substituents are facing in same axial or equatorial plane. The confirmation is said to be trans when both the substituents are facing in the opposite planes.

In the structure I, we can see that both the groups are facing in the opposite planes and hence the structure must have a trans confirmation. In structure two, the groups are in the same plane and hence the confirmation is a cis confirmation.

Hence, the correct option is  c. I = trans; II = cis.

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Weathering of rocks by chemicals called  the breaking down or dissolving of rocks and minerals on Earths surface.

What is meant by rocks?

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Answer: #1 deforestation

Explanation:

Answer:

hhyýuhhhí7

Explanation:

Morang District Coordination Committee (DCC), formerly called Morang District is located in Province 1 of the eastern region of Nepal. It borders with Bihar (India) to the South, Jhapa to the East, Dhankuta & Panchthar to the North and Sunsari to the west. Morang has one Sub-Metropolitian (Biratnagar), eight municipalities and 8 rural municipalities. The total area of Morang is 1,855 km2. The lowest elevation point is 60 meter and highest elevation point is 2410 meter above sea level. The headquarter of Morang is connected by Koshi National High way to the East-West Mahendra National Highway at Itahari, Sunsari, and Morang is also connected to the Hill parts of the eastern region of Nepal. Morang is the core Industrial sector for the eastern region of Nepal

The Moon, Mercury, Edge of the Universe, Milky Way Galaxy, Hubble Galaxy, Pluto's Moon. Closest to Earth/ Farthest.

The universe is the entirety of everything that exists, including all matter and energy, space and time, and the physical laws and constants that govern them. The known universe is thought to be made up of billions of galaxies, each containing billions of stars and planets. The universe is also thought to be expanding, with all the galaxies moving away from each other.

The current scientific understanding of the universe is based on the Big Bang theory, which suggests that the universe began as a singularity, an infinitely dense and hot point, about 13.8 billion years ago. From this singularity, the universe expanded and cooled, giving rise to the formation of matter, stars, galaxies and eventually, the emergence of life.

The universe is also thought to be filled with dark matter and dark energy, which are thought to make up the majority of the universe's mass and energy, respectively.

The universe is a vast and complex place, with much that remains unknown and mysterious. Scientists continue to study the universe through telescopes, satellites, and other observation tools to understand more about its origins, structure and evolution.

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Carbonyl peak in a ring as the size of the ring contracts will B. Peak wavenumber shifts right by 30 for every carbon atom removed  .

In general ,carbonyl group C=O is having a larger dipole moment and hence it is intense in stretching and vibration these peak generally appears from 1900 to 1600. As a result, an aromatic ring is attached to a carbonyl carbon, the C=O. Also a stretching peak position is lowered due to the phenomenon of conjugation.

Also , carbonyl group act in the functional role for diminishing the bonds within the carbon chain. That makes electronegative oxygen atom to attract more electrons with the carbon it is bonded and within the carbonyl group.

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Answer:

The current location of the North Magnetic Pole is in the Arctic Ocean, near the coast of northern Canada, specifically in the region of northern Quebec and Ellesmere Island in the Canadian Arctic Archipelago.

Explanation:

However, it's important to note that the North Magnetic Pole is not a fixed point on the Earth's surface, but it is instead constantly moving. The North Magnetic Pole is moving away from Canada and towards Siberia at a rate of about 55 km (34 miles) per year. This movement is caused by changes in the Earth's magnetic field and is known as the "wandering" of the magnetic poles. The exact location of the North Magnetic Pole can be determined by regular measurements and it is used as a reference point for navigation.

One mole of a substance contains Avogadro's number of atoms or molecules, which is approximately 6.022 x 10²³. Therefore, 1 gram of a substance contains the same number of atoms or molecules as its molar mass in grams.

The molar mass of oxygen (O2) is 32 grams per mole. Therefore, there are approximately 6.022 x 10²³ molecules in 1 gram of oxygen.

Avogadro's number is a fundamental constant of chemistry that is used to define the number of atoms, ions, or molecules in one mole of a substance. Avogadro's number is approximately 6.022 x 10²³, which is the same as saying that one mole of a substance contains 6.022 x 10²³ atoms, ions, or molecules.

This relationship between the number of atoms, ions, or molecules in a substance and the number of moles of that substance is known as Avogadro's Law.

For example, a mole of oxygen gas (O2) contains 6.022 x 10²³ oxygen molecules. Since the molar mass of O2 is 32 g/mol, 1 gram of O2 contains 6.022 x 10²³÷ 32 = 1.8605 x 10²³ oxygen molecules.

This relationship can be useful in many areas of chemistry and physics, such as calculating the number of atoms in a sample of a substance, determining the concentration of a solution, and more.

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If metal x is lower than metal y in the activity series, then metal x replaces ions of metal y in a solution and loses electrons more readily than metal y.

The activity series or also known as the reactivity series is a list of elements that are arranged in the order of their decreasing reactivity. Because metals replace other metals and nonmetals replace other nonmetals, each has its own activity series.

Metals and halogens are ranked in the activity series based on their ability to displace other metals or halogens below them.

There are single replacement reactions occurring in nature that only occur when the element that is doing the replacement is more reactive than the element that is being replaced. Therefore, it is important for the activity series to exist.

There are elements placed in the activity series which react with cold water, steam, and even acids.

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Answer: The pH of the final solution is 7.12.

What is the Henderson Hasselbalch equation?

The Henderson-Hasselbalch equation relates the pH (in an aqueous solution) of an acid to its pKa (acid dissociation constant). The pH of a buffer can be estimated using this equation if the concentrations of an acid and its conjugate base, or a base and the corresponding conjugate acid, are known.

It is given by the formula:

[tex]pH = pKa + log\frac{[salt]}{[Acid]}[/tex]

Apply Henderson-Hasselbalch equation:

pH = pKa + log [K2HPO4] / [KH2PO4]

[K2HPO4] = (50 x 2 / 200) = 0.5 M

[KH2PO4] = (25 x 2.0 / 200)  = 0.25 M

pH = 6.82 (given) + log [0.5] / [0.25]

pH = 7.12

Therefore, the final pH is 7.12.

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Answer:

B. Metalloids

Explanation:

Metalloids are the part of the periodic table that border metals and nonmetals (think of the staircase) therefore they have qualities of both metals and nonmetals

Two ways to tell that the steel wool in the video underwent a chemical reaction are the production of heat and the change in color of the steel wool.

The production of heat during a chemical reaction is a result of the energy released or absorbed during the chemical reaction. The heat generated during the chemical reaction with steel wool can be observed as the steel wool becomes hot to the touch.

Additionally, chemical reactions often result in a change in the color of the reactants or products, as the steel wool changes from its original silver color to a black color due to the formation of new compounds. This change in color is an indicator that a chemical reaction has occurred.

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Alcohols are organic compounds that contain a hydroxyl (-OH) group bonded to a carbon atom. They can be classified as primary, secondary, or tertiary based on the number of carbon atoms bonded to the carbon atom bearing the hydroxyl group.

Reactions of alcohols include:

Dehydration - the removal of water from the alcohol to form an alkene or alkyne.

Oxidation - the process by which the alcohol is converted into a more highly oxidized compound such as a carboxylic acid or a ketone.

Substitution - the replacement of the hydroxyl group with another group, such as a halogen.

Esterification - the reaction of an alcohol with a carboxylic acid to form an ester.

Synthesis of alcohols can be done through a variety of methods including:

Hydrolysis of alkyl halides or alkyl sulfates.

Reduction of aldehydes, ketones, or carboxylic acids.

Fermentation of sugars using yeast or bacteria.

Grignard reaction - the addition of a Grignard reagent (a Organo magnesium compound) to a carbonyl compound.

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Answer:

This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance.

More specifically, the inclusion criteria are:

Elementary particles from the Standard Model of particle physics that have so far been observed. The Standard Model is the most comprehensive existing model of particle behavior. All Standard Model particles including the Higgs boson have been verified, and all other observed particles are combinations of two or more Standard Model particles.

Antiparticles which were historically important to the development of particle physics, specifically the positron and antiproton. The discovery of these particles required very different experimental methods from that of their ordinary matter counterparts, and provided evidence that all particles had antiparticles—an idea that is fundamental to quantum field theory, the modern mathematical framework for particle physics. In the case of most subsequent particle discoveries, the particle and its anti-particle were discovered essentially simultaneously.

Composite particles which were the first particle discovered containing a particular elementary constituent, or whose discovery was critical to the understanding of particle physics.

The given statement "scientists have reached a main milestone in learning how to reverse aging" is true because scientists have investigated that lifestyle interventions, such as proper and healthy diet, exercise and supplements can reverse aging.

Scientific studies reveal that lifestyle interventions, including diet, exercise, and supplements can reverse aging. For instance, in one of the studies, patients were put on a healthy diet, had to take particular supplements, and exercise. After 8 weeks of following this plan, their epigenetic age was reversed by almost two years.

Thus, the given statement correctly specifies that scientists have achieved a big milesotme to reduce or reverse aging.

"

Complete question

scientists have reached a key milestone in learning how to reverse aging

True

False

"

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Synthesis reaction and Decomposition reaction are two essentially opposite reactions to one another.

The reaction that occurs when two different atoms or molecules interact to form a different molecule or compound is known as the synthesis reaction.

For example, the formation of Sodium Chloride ([tex]NaCl[/tex]) from Sodium ([tex]Na[/tex]) and Chlorine([tex]Cl_2[/tex]). The reaction can be given by the chemical equation:

[tex]2Na+Cl_2 \rightarrow2NaCl[/tex]

The reaction that occurs when one reactant breaks down into two or more products is known as the decomposition reaction.

For example, the decomposition of Calcium Carbonate([tex]CaCO_3[/tex]) by heat into Calcium Oxide ([tex]CaO[/tex]) and Carbon Di-Oxide([tex]CO_2[/tex]). The reaction can be given by the chemical equation:

[tex]CaCO_3\rightarrow CaO+CO_2[/tex]

Hence, Synthesis reaction and Decomposition reaction are two essentially opposite reactions to one another.

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Answer:

0.636 mol/dm³

Explanation:

The grams of hydrogen must react to produce the 31.5 grams of ammonia is 5.60 grams.

The reaction is given as :

N₂ + 3H₂  ---->   2NH₃

The mass of the ammonia = 31.5 g

The moles of ammonia = mass / molar mass

                                       = 31.5 / 17

                                       = 1.85 mol

3 moles of H₂ produces the 2 moles of NH₃

The moles of  H₂ = (3/2) × 1.85

                             = 2.775 mol

The mass of  H₂ = moles × molar mass

                           = 2.775 × 2

                           = 5.60 g

Thus, the mass of the hydrogen will react to form ammonia is 5.60 g.

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For the solubility curve of saturated solution x, The weight of x will crystallizes out​ will be 16g.

When all of the solute has been dissolved, a solution is said to be saturated. In a saturated solution, no more solute may dissolve after a given temperature. We can make a saturated solution by attempting to dissolve the solute until further attempts are futile.

a mixture once the solvent has completely dissolved. Any extra solute will crystallize and sink to the bottom of the vessel.

When a solution reaches a given temperature, no more solute can be dissolved, it is said to be saturated. For instance, adding sodium chloride (NaCl) to water at room temperature results in the formation of a saturated solution.

At 80°C, we have 1000cm³ = 0.4mol/cm³

40°C = 0.3mol/cm³

hence, the loss in concentration = 0.1mol/cm³

= 0.1 x 160 = 16g

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Complete question -

If 123.7 g of potassium reacts with gold chloride, the amount of gold produced would be 208.79 grams.

Potassium metal reacts with gold chloride to produce potassium chloride and gold metal according to the following chemical reaction:

[tex]3K + AuCl_3 -- > 3KCl + Au[/tex]

Recall that: mole = mass/molar mass

123.7 g of potassium would be equivalent to: 123.7/39 = 3.17 mol

From the equation of the reaction, the mole ratio of potassium to gold is 3:1. Thus, the mole equivalent of the produced gold would be:

3.17/3 = 1.06 mol

Mass = mole x molar mass

1.06 mol of gold would be equivalent to: 1.06 x 196.97 = 208.79 grams

In other words, the amount of gold produced from the reaction of 123.7 g of potassium with gold chloride would be 208.79 grams.

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Answer: Two atoms that have the same mass number must have the same number of protons and neutrons

Explanation: I hope this helps!

(d.) ionic lattice hydrating. Because water's lattice energy and hydration energy differ from one another, ionic compounds dissolve in it. Ions with opposing charges attract each other, while ions with like charges repel one another.

Ionic substances are  ionic compounds. These ions are made up of atoms with an overall positive or negative charge as a result of electron gain or loss. Because they frequently lose electrons, metals acquire a net positive charge and change into cations. Non-metals frequently acquire electrons, giving anions a net negative charge. results in ionic, or electrovalent, compounds; they are best represented by the mixtures of nonmetals and alkali and alkaline-earth metals. A compound known as an ionic compound is one that is created when two oppositely charged ions come together to form a chemical bond, such as sodium chloride.

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