Suppose A Piece Of Sodium Metal Gains 2.05 G Of Mass After Being Exposed To Air. Assume That This Gain (2024)

The cell potential of the cell formed by these two reaction will be -1.91 v Hence, Option (C) is Correct.

What is cell potential ?

The cell potential, (Ecell), is the measure of the potential difference between two half cells in an electrochemical cell.

Given ;

Reduction potential of first half cell reaction = -2.71 vReduction potential of second half cell reaction = 0.8 v

To Find :

Cell potential of the cell formed by these two reaction

Solution :

The cell potential of the cell formed by these two reaction will be -1.91 v

The reaction MG²⁺ + 2e- -------------> Mg is a reduction reaction while the reaction Ag ---> Ag + 1e⁻ is an oxidation reaction.

Second reaction is oxidation reaction so to convert it into reduction reaction we will change the sign of its electrode potential Hence, reduction potential of second half cell is 0.8 v

Now, to find the cell potential of the cell formed by these two reaction we will add the two half reactions and we get,

-2.71 + 0.8 = -1.91

Hence the cell potential of the cell formed by the given reaction is -1.91 v.Therefore, Option (C) is Correct.

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Answer: The molecules of Bree’s potato are moving faster than the molecules of Rico’s potato.

Explanation:

Answer: 147 mL

Explanation:

Given:

Molarity of the sodium bromide (NaBr) solution (M1) = 1.75 M

Volume of the solution (V1) = 84 mL

Molarity of the diluted NaBr solution (M2) = 1 M

Using the dilution formula to solve for V2:

[tex]\begin{gathered}M_{1} V_{1}=M_{2} V_{2} \\V_{2}=(1.75 \mathrm{M} \times 84 \mathrm{~mL}) / 1 \mathrm{M} \\V_{2}=147 \mathrm{~mL}\end{gathered}[/tex]

Therefore, the new volume of the solution is 147 mL

Answer:

what is sentence X?

.

write your answer clearly

Answer:

the sun

Explanation:

edge 2020

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

9 L of the NO2 was produced if 9.0 L of NO are reacted with excess [tex]O_2[/tex] at STP.

What is an ideal gas equation?

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

According to the question, the given reaction is -

2NO(g) + O₂(g)--->2NO₂(g)

Since at STP one mole of a gas occupies the volume of 22.4 L.

As given in the question -

9 L of NO, i.e .

22.4 L = 1 mol

1 L = [tex]\frac{1}{22.4 mol}[/tex]

For 9 L =[tex]\frac{1 X 9L}{22.4 mol}[/tex] = 0.40 mol

From the chemical reaction,

The Oxygen is in excess, hence NO becomes the limiting reagent, and will determine the moles of the product.

Hence, 2 moles of NO will produce 2 moles of NO₂.

Therefore, 0.40 mol of NO will produce 0.40 mol of NO₂.

Hence, the volume of NO₂ can be calculated as -

1 mol = 22.4 L

0.40 mol = 0.40 X 22.4 L = 9 L

Hence, 9 L of the NO₂ was produced.

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The Haber Process combines nitrogen from the air with hydrogen to form ammonia. The reaction is reversible and the production of ammonia is exothermic.

N2(g)+H2(g)⇌2NH3(g)

Answer:

NH₄Cl ------> NH₃ + HCl

Explanation:

Ammonium Chloride =(NH₄Cl

Ammonia = NH₃

Hydrochloric Acid = HCl

NH₄Cl ------> NH₃ + HCl

In decomposition reaction, the reactant is breaking down into smaller parts. In this case, all of the coefficients are 1. The reaction is already balanced.

We can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

How do we know that displacement and time determine velocity?

We know this by analyzing the scientific formulas created to measure the velocity of an object. The formula for this is [tex]\frac{d}{t}[/tex] , meaning displacement over a period of time. Since option 3 described this equation perfectly, we can say that this is the correct option.

Therefore, we can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

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Answer:

Carbons

Explanation:

The difference between the two molecules is the fact that butene has a double bond in-between two of the carbons. Because of this, butene has two less hydrogens than butane. However, they still have the same amount of carbons (4).

Considering the ideal gas law, 64.68 grams of N₂ gas are present in a 20.0 L tank of N₂ that is at 290 K and 2.75 atm.

Ideal gas law

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

where:

P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.n is the number of moles of the gas.

Mass of N₂

In this case, you know:

P= 2.75 atmV= 20 LT= 290 KR= 0.082 [tex]\frac{atmL}{molK}[/tex]n= ?

Replacing in the ideal gas law:

2.75 atm× 20 L = n×0.082 [tex]\frac{atmL}{molK}[/tex]× 290 K

Solving:

n= (2.75 atm× 20 L)÷ (0.082 [tex]\frac{atmL}{molK}[/tex]× 290 K)

n= 2.31 moles

Being the molar mass of N₂ 28 g/mol, then the mass of 2.31 moles is calculated as:

mass= 28 [tex]\frac{g}{mole}[/tex]× 2.31 moles

Solving:

mass= 64.68 grams

Finally, 64.68 grams of N₂ gas are present in a 20.0 L tank of N₂ that is at 290 K and 2.75 atm.

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The presence of the lone pair on nitrogen in NH3 explains why the molecule has a different shape from H2CO in which there is no lone pair

What is molecular shape?

The molecular shape of a compound is determined by the number of electron pairs that surround the central atom in the molecule.

Let us also note that the presence of lone pairs distorts the shape of a molecule from the ideal prediction of the valence shell electron pair repulsion theory.

Thus, the presence of the lone pair on nitrogen in NH3 explains why the molecule has a different shape from H2CO in which there is no lone pair on the central atom.

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Answer:

see the attached file!!!!!

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100

[tex] \frac{15.1}{43.4} \times 100\%[/tex]

= 34.79 %

A 43.40 mg sample of alcohol contains 15.10 mg O, 22.6 mg C, and the rest is hydrogen. The percent composition of oxygen is 37.49 %.

What is percent composition?

The ratio of the amount of each element to the sum of all the individual components present in the compound, multiplied by 100, is the definition of the percentage composition of a given compound.

The percent composition tells the mass of each element in a compound. To find the percent composition, first know the molar mass of the element.

Given that the sample of alcohol is 43.40 mg

The alcohol contains 15.10 mg O, and 22.6 mg C, and the rest is hydrogen.

The formula to calculate the percent composition is

15.10 / 43.40 = 37.49 %.

Therefore, the percent composition of oxygen is 37.49 %.

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Answer:

Explanation:

[tex]\frac{7.8}{7.8+134} \times 100 \approx \boxed{5.5\% \text{ (to 2 sf)}}[/tex]

The digestion process in Ruminants begins by chewing and swallowing their food.

What are ruminants?

A ruminant is any herbivorous animal that has a stomach with four compartments, which are tasked with acquiring nutrients from plant-based food by fermenting it prior to digestion.

The digestion process in Ruminants begins by chewing and swallowing their food. Ruminants do not completely chew the food they eat, but just consume or gulp as much they can and then swallow the food. This is actually an adaptation by which these animals have evolved to spend as little time as possible feeding so that they are not hunted down by any predators while they are eating.

As mentioned earlier, the stomach of these Ruminants is divided into 4 chambers – rumen, reticulum, omasum, and the abomasum.

The process of digestion begins with the first two chambers of the stomach, the rumen and reticulum by softening the ingested matter. Later the microbes present in the rumen produces the cellulase enzymes required to digest the cellulose.

Once the plant fibres have been broken down to provide vitamins, proteins, and other organic acids, the nutrients are absorbed into the animal’s bloodstream.

Coarse plants are sent further into the next chamber for further digestion. Here is where the further bacterial action takes place and the food is formed into soft chunks called the cud.

This cud produced is regurgitated back into the animal’s mouth where it can be chewed again. The saliva of the cow greatly aids in digesting the cud.

After chewing, the food bypasses the two chambers of the stomach and directly enters the third chamber. The walls of the third chamber mash and compact the food molecules further, and then pass it to the fourth chamber – the abomasum.

The final digestion in the stomach is carried by the abomasum and then passed to the intestine.

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The browning of sugar (Step 2) is a chemical change. The process of browning sugar is known as caramelization.

What is caramelization?

It is the process of browning carb products by dehydrating, heating on the fire. In this process, carbohydrates are broken down.

During caramelization, several products are formed such as caramelan and caramelin.

During the browning of sugar, the sugar reacts with oxygen to form new products.

Therefore, In the Step 2 the browning of sugar is a chemical change.

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When the mass of atoms are given, we can easily find out the simplest (Empirical) formula of the molecule.

Here, the Simplest (Empirical) formula for the given alkane is [tex]C_3H_8[/tex]

What is Empirical Formula ?

Empirical formula is defined as the formula of a compound which gives the simple whole number ratio of the atoms of various elements present in one molecule of compound.

For this problem, we are given the mass in grams of each element.

Begin by finding the moles of each :

No. of mole = Given weight / Atmoic Weight

So,

No. of Moles of Carbon = 9/12 = 0.75

No. of Moles of Hydrogen = 2/1 = 2

Next, derive the Carbon-to-Hydrogen molar ratio by dividing by the lesser number of moles :

C = 0.75/0.75 = 1

H = 2/0.75 = 2.66

The ratio is 1.000 mol of Carbon to 2.66 mol of Hydrogen ([tex]C_1H_2._6_6[/tex]).

Finally, multiply the ratio by three to get the smallest possible whole number subscripts while still maintaining the correct Carbon-to-Hydrogen ratio :

3 ([tex]C_1H_2._6_6[/tex]) = ([tex]C_3H_7._9_8[/tex]) = [tex]C_3H_8[/tex]

Hence, the Simplest (Empirical) formula for the given alkane is [tex]C_3H_8[/tex]

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Answer:

A) serious, determined, stubborn

Explanation:

Transcript of the passage (Paraphrased):

"Captain Ahab stood tall, his gaze fixed on the horizon beyond the ship's ever—pitching prow. In the steadfast and fearless, forward devotion of that look, there was an infinity of firmest fortitude, a determined, unyielding wildness. He didn't say anything, nor did his subordinates, despite the fact that their smallest actions and attitudes revealed an unpleasant, if not painful, awareness of being under the watchful eye of a disturbed master."

According to the text, the greatest phrases to characterize Captain Ahab from the novel Moby-D are

A) serious, resolute, and obstinate

The narrator described Captain Ahab's manner as one of "fortitude. fixed, and fearless" as he did not utter a word and viewed the ocean from his ship, according to the extract.

As a result, option A is the best word to describe his expression.

This is because we are led to believe that he is completely concentrated and not in a fun mood due to the work at hand.

Extra info on Moby - D:

Moby-D by Herman Melville is an American classic rich with symbolism. The white whale Moby-D is an essential emblem in the narrative. According to an excerpt from Herman Melville's work Moby-D, one interpretation of Moby-D as a symbol in the novel is the distinction between people and animals. The letter C is the correct answer. This is because it has various connotations for men, such as vengeance, death, and transcendence, yet it is just used for self-defense by the white whale. The white whale was so terrified of the individuals that haunted him that he had to do what he needed to do to protect himself. Ishmael saw the whale's forehead was covered with scrapes and wrinkles. This signaled that the whale was growing exhausted and was nearing the end of its life.

Answer: (A)serious, determined, stubborn

Explanation: Right on edge :)

Taking into account the definition of dilution, you need to use a volume of 272.72 mL of a 0.275 M NaCl solution.

Dilution

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volume

Initial volume

In this case, you know:

Ci= 0.275 MVi= ?Cf= 0.0750 MVf= 1 L

Replacing in the definition of dilution:

0.275 M× Vi= 0.0750 M× 1 L

Solving:

Vi=(0.0750 M× 1 L)÷ 0.275 M

Vi= 0.27272 L= 272.72 mL

In summary, you need to use a volume of 272.72 mL of a 0.275 M NaCl solution.

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Answer:

Ozone or, also known as O^3 is commonly formed by oxygen's interaction with lightning, and is what make the air smell so fresh after it rains. Hope this helps on your gradpoint Earth Atmosphere Posttest!

Explanation:

Answer:

Because of the summer season

Explanation:

The water in the dish which is uncovered will evaporate faster as compared to the one which is

covered. This is because the air above the uncovered dish has less water vapour over it as

compared to the one which is covered. The covered dish has good amount of moisture over it as

the closed lid does not allow the moisture to come in direct contact with air.

Answer:

CI706

Explanation:

Answer:

Cl7O6

Explanation:

hepta means 7 and hex means 6, therefore, 7 chlorines and 6 oxygens

An Arrhenius base is a molecule that when dissolved in water will break down to yield an [tex]OH^-[/tex] or hydroxide in solution.

What is Arrhenius base?

An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution.

An Arrhenius base is a substance that, when dissolved in an aqueous solution, increases the concentration of hydroxide, or [tex]OH^-[/tex], ions in the solution.

Bases Properties

Arrhenius bases that are soluble in water can conduct electricity.

Bases often have a bitter taste and are found in foods less frequently than acids. Many bases, like soaps, are slippery to the touch.

Bases also change the colour of indicators. Red litmus turns blue in the presence of a base (see figure below), while phenolphthalein turns pink.

Some bases react with metals to produce hydrogen gas.

Acids (pH < 7.0) react with bases (pH > 7.0) to produce a salt and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The resulting mixture will have a more neutral pH.

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of H+ ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions, [tex]OH^-.[/tex]

Example, sodium hydroxide, is added to an aqueous solution. NaOH dissociates into sodium, [tex]Na^+[/tex], and hydroxide, [tex]OH^-,[/tex] ions.

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