What percentage of the earth is covered by water?

1930 Coulombs of   charge or electricity are used when a current of 0.2 A is passed through dilute sulphuric acid for 9650 s.

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.The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire.

Charge is calculated as Q=It=0.2×9650=1930 C.

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Answer:

2.91 moles NH₃

Explanation:

To find the answer, you need to use Avogadro's number to convert between molecules and moles. It is important to arrange the ratio/conversion in a way that allows for the cancellation of units. The final answer should have 3 sig figs because the given value (1.75) also has 3 sig figs.

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

1.75 x 10²⁴ molecules NH₃                      1 mole
--------------------------------------  x  ------------------------------------  = 2.91 moles NH₃
                                                  6.022 x 10²³ molecules

A zwitterion is a neutral molecule with both positive and negative charges. Amino acids in their zwitterionic form have protonated amino groups and deprotonated carboxyl groups, allowing them to maintain a balanced, neutral charge under physiological pH conditions.

A zwitterion is a molecule that possesses both positive and negative charges, yet maintains an overall neutral charge. In the context of amino acids, a zwitterionic form occurs when the amino group \((NH_2)\) and the carboxyl group \((COOH)\) within the amino acid structure ionize.

An amino acid in its zwitterionic form has a protonated amino group \((NH_3^+)\) and a deprotonated carboxyl group \((COO^-)\). The positively charged amino group and the negatively charged carboxyl group balance each other, resulting in a net charge of zero for the entire molecule.

This zwitterionic state is commonly found in amino acids under physiological pH conditions (around 7.4) because it provides stability for the amino acid molecules. At different pH levels, the ionization state of the amino and carboxyl groups may change, causing the molecule to lose its zwitterionic properties.

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The product of the reduction of ethyl 4-oxobutanoate with sodium borohydride in ethanol at room temperature for 30 minutes is Ethyl 4-hydroxybutanoate (Option A).

What is ethyl 4-oxobutanoate and what does it look like?

Ethyl 4-oxobutanoate, also known as ethyl acetoacetate, is an organic compound with the chemical formula CH₃C(O)CH₂CO₂C₂H₅. It is derived from acetoacetic acid and is an ester of acetoacetic acid.

Ethyl 4-oxobutanoate is a colorless liquid with a fruity odor.

During the reduction reaction, sodium borohydride (NaBH₄) acts as a reducing agent, donating hydride ions (H-) to the carbonyl group of the ethyl 4-oxobutanoate. This results in the conversion of the carbonyl group (C=O) to a hydroxyl group (OH) and the formation of the corresponding alcohol.

Therefore, the correct product of the reduction of ethyl 4-oxobutanoate with sodium borohydride is Ethyl 4-hydroxybutanoate (Option A).

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2Li2S + Sn(SO4)2 → 2Li2(SO4) + SnS2 is Balanced chemical equation.

What is Balanced chemical equation?

A balanced chemical equation is a chemical reaction that has equal numbers of moles of chemical substances both in the reactant and the product side.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides.

In a balanced chemical equation, the mass and the change are both equal.

From the missing image that is attached below, we can see that the picture depicts that we have:

The reactant side:

3 molecules of CH₄ and 3 molecules of N₂Cl₄

The product side:

3 molecules of CCl₄, 3 molecules of N₂ and 6 molecules of H₂

Therefore, the balanced chemical equation for the reaction is:

3CH₄ + 3 N₂Cl₄ → 3 CCl₄ + 3N₂ + 6H₂

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The chemical equation will be incorrect if the subscripts are changed because this changes the substance itself. As a result, only coefficients can be modified, not subscripts.

The objective of balancing a chemical equation is to make sure that it complies with the law of conservation of mass. This law states that during a chemical reaction, mass is neither generated nor eliminated. Therefore, each element must have an equal amount of atoms on both sides of the equation. Because they represent the quantity of moles or molecules of a substance involved in the reaction, coefficients are employed to balance chemical equations.

One can vary the amount of atoms on both sides of the equation to maintain balance by altering the coefficients. Whereas, Subscripts are a part of chemical formulas and show how many atoms of each element there are in a compound. Because changing the subscripts would change the actual chemical identity of the substances involved, subscripts cannot be modified while a chemical equation is being balanced.

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Complete Question:

Why can you only change the coefficients but not subscripts ?

Answer:A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

Explanation:A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

PLEASEEEEE CAN SOMEONE HELP MEEE??? (iI have TWO questions PLSPLSPLSPSLPLSPLSPLSP)

3.) What happened to Patroclus at the end of yesterday's reading?

He won the battle.

He went to Mt. Olympus to talk to Zeus.

He died.

-------------------------------------------------------------------------------------------------------

4.Who was Agamemnon trying to persuade to come fight with him again?

Patroclus

Achilles

Odysseus

Hector

The grams of calcium in the formula derived from calcium citrate , C₁₀H₁₀Ca₃O₁₄.4 H₂O is 0.843 g .

C₁₀H₁₀Ca₃O₁₄.4 H₂O is the formula of Calcium citrate . There is 3 calcium ions present in the calcium citrate .

                            Molecular weight of Ca = 40.08 g

                  ∴ Molecular weight of 3 Ca = 3 × 40.08

                                            = 120.24 g

Molecular weight of C₁₀H₁₀Ca₃O₁₄.4 H₂O = 570.5 g

∴ 120.24 g calcium are present in 570.5 g of calcium citrate

In 4 g calcium citrate ----- 120.24 g ÷ 570.5 g × 4 g

                                                       = 0.84304995618 g

                                                      ≈ 0.843 g

Therefore , the gram of calcium in the formula derived from calcium citrate , C₁₀H₁₀Ca₃O₁₄.4 H₂O is 0.843 g .

Calcium citrate is known calcium salt of citrus extract. It is frequently utilized as a food additive, typically as a preservative but occasionally as a flavor enhancer. It is comparable to sodium citrate in this regard. Some calcium supplements can also contain calcium citrate. Calcium is a mineral that can be found in foods naturally. Bone formation and maintenance are among the many normal body functions that require calcium.

Calcium deficiencies can be prevented and treated with calcium citrate. If you have trouble absorbing calcium, calcium citrate supplements can help you reach the recommended daily intake. The majority of people can get enough calcium from food alone. Calcium citrate is taken by some for bone health and to lower their risk of heart disease and cancer.

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Incomplete question , missing part is below :

The Formula For Compounding Sertraline Hydrochloride Capsules: Sertraline Hydrochloride (ZOLOFT Tablets, 100 Mg) 3 Tablets Silica Gel 6 G Calcium Citrate 4 G M.Ft. Caps No. 40

Sig: Use As Directed.

Calculate The Grams Of Calcium (M.W. 40.08) In The Formula Derived From Calcium Citrate, C₁₀H₁₀Ca₃O₁₄ · 4 H₂O (M.W. 570.5)

The formula for compounding sertraline hydrochloride capsules includes Sertraline hydrochloride (ZOLOFT tablets, 100 mg) 3 tablets, silica gel 6 g, calcium citrate 4 g, and M.ft. caps no. 40. The exact directions for use should be provided by a healthcare provider or pharmacist.

The formula provided contains the following components:

1. Sertraline hydrochloride: This is the active ingredient, sourced from 3 ZOLOFT tablets, each containing 100 mg of sertraline hydrochloride. This results in a total of 300 mg of sertraline hydrochloride.
2. Silica gel: This component, included at 6 g, serves as a desiccant, helping to keep the capsules dry.
3. Calcium citrate: Included at 4 g, calcium citrate serves as an excipient, aiding in the formulation of the capsules.

The formula indicates that the components should be mixed to create a total of 40 capsules. The label instructs the patient to "Use as directed," which means the dosage and administration should be followed according to the healthcare provider's instructions.

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Answer:

This answer I think it is Al,F

Answer:

City B has the larger annual temperature range

Explanation:

This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.

Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.

here's the answer to your question

The relative mass of the magnesium oxide (MgO) is equal to 40 g. The percentage by mass of magnesium in MgO is 60 %.

The mass percentage of any element in a particular compound can be calculated from the number of parts by mass of the element in 100 parts by mass of a given compound.

Calculate the molar mass of the given compound by adding the atomic masses of the present elements. Then, the percentage of each element can be determined by dividing the total mass of the element by the molar mass of the compound multiplied by 100.

Given, the molecular formula of magnesium oxide is MgO. The atomic mass of Mg and O is 24 g and 16 g respectively.

The relative formula mass of the MgO = 40 g/mol

The mass percentage of the Mg = (24/40) × 100 = 60 %

Therefore, the mass percentage of the Mg in MgO is equal to 60 %.

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1. a) Decantation: It is a technique that involves carefully pouring off a liquid, leaving behind sediment. For example, in a mixture of oil and water, decantation can be used to separate the oil and water layers.

b) Centrifugation: It is a technique that involves the separation of particles from a liquid or solution under centrifugal force. The centrifugal force causes denser particles to separate from the lighter particles.

c) Supernatant: It is a term used to describe the liquid present above a solid or sediment after decantation or centrifugation.

d) Precipitate: It is a solid that forms from a solution during a chemical reaction or by changing physical conditions such as temperature or pressure.

2. The reagents that can be used to identify and confirm Ag, Hg2²⁺, and Pb²⁺ ions are given below:

a) Ag⁺ ions: They can be identified by adding a few drops of hydrochloric acid to the solution. The formation of a white precipitate indicates the presence of Ag⁺ ions.

b) Hg₂²⁺ ions: They can be identified by the formation of a brownish-red precipitate upon the addition of potassium iodide solution.

c) Pb²⁺ ions: They can be identified by the formation of a white precipitate upon the addition of hydrochloric acid and potassium iodide.

It's important to note that confirmatory tests may involve additional reagents and experimental procedures to ensure the accurate identification of these ions. Confirmatory tests are critical to ensure accurate identification of ions and may involve additional reagents and procedures to confirm the results obtained from initial tests. These tests help to eliminate false positives or negatives and provide a more definitive identification of the ion in question. It's crucial to follow established protocols and safety guidelines when performing confirmatory tests to obtain reliable and reproducible results.

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 2Al₂O₃    →   4Al + 3O₂

the mass of aluminum that can be formed from Al₂O₃ is 540g.

The reaction is given as follows :

2Al₂O₃    →   4Al + 3O₂

mass of the aluminum oxide = 1020 g

molar mass of  aluminum oxide = 101.96 g/mol

moles of  aluminum oxide  = mass / molar mass

                                            = 1020 / 102

                                            = 10 mol

2 mol of  aluminum oxide  produced 4 mol of Al

10 mol of  aluminum oxide  = (4/2) × 10 = 20 mol

moles of  aluminum   = 20 mol

molar mass of Al = 27 g/mol

mass of Aluminum = moles × molar mass

                               = 20 × 27

                               = 540 g

thus the reaction is :

2Al₂O₃    →   4Al + 3O₂

the mass of aluminum that can be formed from Al₂O₃ is 540g.

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The formula when converting g/mL to mg/L is to multiply the mass / volume value by 1e+6

When we do this we come up with 1,730,000

This however, should be written as either 1.73⋅10^5 or 1.73E+5.

Answer:

Beta decay changes the atomic number of the nucleus by increasing the number of protons, by decreasing the number of neutrons while leaving the atomic mass essentially the same.

The linen wrapping is approximately 6555 years old.

We know that the half-life of carbon-14 is 5750 years, which means that every 5750 years, the amount of carbon-14 in a sample will be reduced by half. Therefore, we can use this information to calculate the age of the linen wrapping.
n = (ln(percentage of carbon-14 remaining)) / (ln(0.5))
where n is the number of half-lives that have passed.
Using the percentage of carbon-14 remaining in the linen wrapping (75.3%), we can plug this into the formula:

n = (ln(75.3%)) / (ln(0.5))
n = 0.788 / 0.693
n = 1.14
This means that 1.14 half-lives have passed since the linen wrapping was made.
Next, we can calculate the age of the linen wrapping by multiplying the half-life by the number of half-lives:
Age = half-life x number of half-lives
Age = 5750 years x 1.14
Age = 6555 years
Therefore, the linen wrapping is approximately 6555 years old.

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Once  KNO3 is fully dissolved, the actual concentration of your solution may be somewhat lower than the concentration you calculate.

When you dissolve potassium nitrate (KNO3) in water, you assume that the solute and solvent mix uniformly to create a homogeneous solution. However, in practice, there may be some discrepancies that can cause the actual concentration to be lower than the calculated concentration.

1. Measurement errors: When measuring the mass of KNO3 or the volume of water, there can be slight inaccuracies due to the limitations of the measuring tools. These errors can cause the actual concentration to deviate from the calculated value.

2. Dissolution efficiency: While KNO3 generally dissolves well in water, it's possible that some small undissolved particles remain, leading to a lower actual concentration in the solution.

3. Temperature variations: The solubility of KNO3 depends on the temperature of the water. If the temperature during dissolution is not uniform, the actual concentration may not be the same as the calculated value.

4. Evaporation: If the container used to dissolve the KNO3 is not fully sealed, some water may evaporate during the dissolution process, causing the actual concentration to be lower than the calculated value.

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Answer:

I think the answer is A.

Explanation:

hope this helps.

The amide group has the amine moiety and the carboxylic moiety.

An amide functional group is a molecule composed of a nitrogen atom bonded to a carbon atom, with the formula -CONH-. It is commonly found in organic compounds such as proteins and synthetic polymers.

We can now see that the chain that came form the carboxyl group is the alky chain of the amide moiety that is in the compound that have been shown in the image attached in the question that have been given above.

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18.0-karat gold combination has a density of 15.58g/cm3

18 parts gold, 5 parts silver, and 1 component copper make up this composition.

Let the gold mass be 18x.

Allow 5 times the mass of silver.

Let the copper's mass be 1x.

The density of gold = 19.32g/cm3

The density of silver = 10.1g/cm3

The density of copper = 8.8g/cm3

Volume = mass/density

Volume of the gold in the mixture =  V1=18x/19.32g/cm3

Volume of the silver in the mixture = V2 = 5x/10.1g/cm3

Volume of the copper in the mixture = V3 = 1x/8.8g/cm3

mass of the mixture = M= 18+5+1x=24x

Volume of the  mixture V1+ V2+ V3

Density of the mixture:

M/V1+ V2+ V3= 15.58g/cm3

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Answer:

A

Explanation:

Phosphorus has an electron configuration of 1s2 2s2 2p6 3s2 3p3. Another way to write that is [Ne] 3s2 3p3. The [Ne] represents the fact that the beginning of phosphorus' electron configuration is the same as Neon's. so if you add all the superscripts they will give you 15. we didn't use choice d because we have to make the last p halffilled(3, half of the total electron held in p shell ) when we make "s shell 1 " not make it 4 because we are transfering that 1 electron .but nevertheless the correct answer is A.

Answer:

the answer is in the photo hope it helps❤❤

The normal boiling point of the 3.45 mol solution of KBr is 104.7384°C.

The normal boiling point of a 3.45 mol solution of KBr with a density of 1.10 g/mL can be calculated using the formula:

ΔT = Kb * molality

where ΔT is the boiling point elevation, Kb is the molal boiling point elevation constant for water (0.512°C kg/mol), and molality is the number of moles of solute per kilogram of solvent.

First, we need to calculate the mass of the solvent (water) required to dissolve 3.45 mol of KBr. The molar mass of KBr is 119 g/mol, so 3.45 mol of KBr would weigh 409.55 g.

Since the density of the solution is given as 1.10 g/mL, the volume of the solution is:

V = m / ρ = 409.55 g / 1.10 g/mL = 372.32 mL

So, the mass of the water is:

mH2O = V * ρH2O = 372.32 mL * 1 g/mL = 372.32 g

The molality of the solution can be calculated as follows:

molality = moles of solute / mass of solvent (in kg) = 3.45 mol / 0.37232 kg = 9.27 mol/kg

Substituting the values in the formula for boiling point elevation:

ΔT = 0.512°C kg/mol * 9.27 mol/kg = 4.7384°C

The normal boiling point of pure water is 100°C, so the boiling point of the KBr solution would be:

Boiling point = 100°C + ΔT = 100°C + 4.7384°C = 104.7384°C

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Students would stand to model the molecules in a solid against the classroom wall. Therefore, the correct option is option C.

According to the context, the term could refer to any ions that meet this requirement. A molecule is a collection of at least two atoms linked together by the attractive forces referred to as chemical bonds.

When speaking of polyatomic ions. Students would stand to model the molecules in a solid against the classroom wall.

Therefore, the correct option is option C.

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Your question is incomplete but most probably your full question was,  

Mrs. Jones' class was learning about how molecules are arranged in solids, liquids, and gases. To model molecules in liquids, she had the students stand one meter apart.

Which ,begin emphasis,best,end emphasis, describes how the students would stand to model the molecules in a solid?

Answer options with 5 options

A.

as far apart as possible

B.

in rows one meter apart

C.

as close as possible

D.

against the classroom wall

E.

five meters apart

The solution with the greatest boiling-point elevation among the given options is Mg(NO₃)₂.

The boiling-point elevation of a solution depends on the concentration of solute particles. In this case, we have three solutions: Mg(NO₃)₂, NaNO₃, and C₂H₄(OH)₂.

Mg(NO₃)₂ dissociates into three ions: Mg²⁺ and two NO₃⁻ ions. NaNO₃ dissociates into two ions: Na⁺ and NO₃⁻. C₂H₄(OH)₂ does not dissociate, so it remains as one molecule.

Since the boiling-point elevation is directly proportional to the number of solute particles, Mg(NO₃)₂, with three ions per formula unit, will have the greatest boiling-point elevation. NaNO₃ has two ions per formula unit, and C₂H₄(OH)₂ has no ionization, resulting in fewer solute particles and lower boiling-point elevation compared to Mg(NO₃)₂.

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Answer:

12 angle

Explanation:

In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals