a myth is not necessarily an untrue story. rather, it imparts cultural meaning and helps us to understand what is ____________. partially true unknown really, real metaphysical emotionally relevant

The experimental yield of nitric acid is  24.648 g if percent yield for the reaction is 60%.

Nitrogen dioxide mass, given, is 45.0 g

Nitrogen dioxide has a molecular mass of 46 g/mol.

For the chemical formula given:

Nitrogen dioxide moles are equal to 45/46 or 0.978 g/mol.

Using the reaction's stoichiometry:

2 moles of nitric acid are produced from 3 moles of nitrogen dioxide.

Nitric acid will therefore be produced by 0.978 moles of nitrogen dioxide.

Now, using equation 1 to calculate the mass of nitric acid, we obtain:

Nitric acid's molecular weight is 63 g/mol.

Nitric acid equals 0.652 moles = weight of nitric acid/ 63

weight of nitric acid= 41.076g

Equation 1 is solved for the following values:

We use the equation: to determine the experimental yield of nitric acid.

0.652=experimental yield / theoretical yield * 100

Theoretical yield = 41.08 g

60%= experimemtal yield/ 41.08*100

Experimental yield= 24.648 g

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The actual formula for volume for a cube is the length multiplied by the width and then multiplied by the height. Since all three measurements are the same, the formula results in the measurement of one side cubed. For the example, 5^3 is 125 cm^3. Multiply the volume by the known density, which is the mass per volume.

Answer: B.They are arranged in energy levels

Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)

The molar solubility of AgCl in a solution that has [Cl−] = 2.0 × 10^−2M is 9.0 × 10^−9 M.

The solubility product constant, Ksp, for AgCl is given as 1.8 × 10^−10 at a certain temperature. The expression for Ksp is:

Ksp = [Ag+][Cl−]

where [Ag+] is the concentration of Ag+ ions in the solution, and [Cl−] is the concentration of Cl− ions in the solution.

For AgCl, the dissociation reaction is:

AgCl(s) ⇌ Ag+(aq) + Cl−(aq)

Let the molar solubility of AgCl be S. Then, at equilibrium, the concentrations of Ag+ and Cl− ions in the solution will be S and 2.0 × 10^−2 M, respectively.

So, the equilibrium expression for Ksp is:

Ksp = [Ag+][Cl−] = S × 2.0 × 10^−2

Substituting the given values, we get:

1.8 × 10^−10 = S × 2.0 × 10^−2

S = (1.8 × 10^−10) / (2.0 × 10^−2) = 9.0 × 10^−9 M

Therefore, the molar solubility of AgCl in a solution that has [Cl−] = 2.0 × 10^−2M is 9.0 × 10^−9 M.

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The concentration of ions in a strong base is higher than in a weak base. Strong bases dissociate completely in water, while weak bases only partially dissociate.

Strong bases, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH), are 100% ionized in water. This means that they completely dissociate into their respective ions: Na+ and OH- or K+ and OH-. Therefore, the concentration of these ions in a strong base is much higher than in a weak base. Weak bases, on the other hand, only partially dissociate in water.

For example, ammonia (NH₃) only partially dissociates into NH₄+ and OH-. This means that the concentration of NH₄+ and OH- ions in a weak base is lower than in a strong base. The strength of a base is determined by its ability to accept protons (H+ ions), and the degree of dissociation in water plays a significant role in this ability. Strong bases have a higher affinity for protons than weak bases, making them more effective at neutralizing acids.

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The balanced equation is, 2C₂H₆ + 7O₂ →  4CO₂ + 6H₂O.

The reaction's balanced equation is as follows.

C₂H₂+O₂ → CO₂+H₂O

Water and carbon dioxide gas are created when dimethyl ether and oxygen combine.

Following is the reaction's balanced chemical equation:

2C₂H₆ + 7O₂ →  4CO₂ + 6H₂O.

Three moles of water and two moles of carbon dioxide gas are produced in this reaction when one mole of dimethyl ether combines with two moles of oxygen gas.

According to the law of conservation of mass, the mass of the reactants and products in a chemical reaction should be equal. As a result, each element's number of atoms stays constant throughout the chemical reaction. As a result, the chemical equation that represents the chemical process needs to be balanced. A chemical equation is considered to be balanced when the sum of the atom counts on the reactants and products sides equals one.

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Complete question -

Balance the given equation -

__C2H2 + __0₂ → __CO₂ + __H₂O

ANSWER

EXPLANATION

Given that

The number of moles lithium bromide is 5.5 moles

Firstly, write a balanced equation for the reaction

Find the number of moles of bromine using stoichiometry ratio

Let x represents the number of bromine

The mechanism of action of an A-B exotoxin involves two components, i.e., an A domain and a B domain, which help in the attachment and the entry of the toxin into the host cell. The B domain of the exotoxin attaches to the specific receptor site present on the host cell surface, which is followed by the internalization of the toxin into the cell by the process of receptor-mediated endocytosis.

The A domain of the exotoxin then cleaves off from the B domain and enters into the cytoplasm of the host cell.The A domain then interferes with the cellular functions of the host cell by either inhibiting the protein synthesis or disrupting the cytoplasmic membrane, leading to the death of the host cell.

Therefore, the mechanism of action of an A-B exotoxin involves the attachment of the B domain to the host cell, entry into the host cell, cleavage of the A domain from the B domain, and interference with the cellular functions of the host cell, leading to the cell death.

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Answer:

Fossils also help us to infer why dinosaurs and other organisms became extinct. Fossils tell us that there was a mass extinction at the time of the dinosaurs. They died out about 65 million years ago, along with more than half of all the other animal and plant species. ... Without plants, dinosaurs could not survive.

Explanation:

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The compound that does not contain more than one hydroxyl group is acetic acid (CH3COOH).

A hydroxyl group is a functional group consisting of an oxygen atom bonded to a hydrogen atom. It is represented by the -OH formula. Hydroxyl groups are commonly found in organic compounds, such as alcohols and carboxylic acids. They are responsible for the characteristic properties and reactivity of these compounds.

When considering the given information that all of the following contain more than one hydroxyl group, we need to identify the option that does not fit this criteria. Let's analyze the options:

Based on the analysis, the option that does not fit the criteria of containing more than one hydroxyl group is Acetic acid (CH3COOH).

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Except for ethanol and propanol, all other substituents have more than one hydroxyl group. Therefore, the correct options are A and C.

A functional group called a hydroxyl group (-OH) is composed of an oxygen atom attached to a hydrogen atom. It can often be found in many organic substances such as alcohols, phenols and carboxylic acids. Molecules that contain a hydroxyl group acquire specific chemical and physical characteristics.

Due to its polar nature, substances containing hydroxyl groups can form hydrogen bonds with other molecules. Their solubility in water is similarly affected by this polarity. Hydroxyl groups are involved in many important biological activities, including the synthesis of carbohydrates, proteins, and nucleic acids.

Therefore, the correct options are A and C.

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Your question is incomplete, most probably the complete question is:

All of the following options contain more than one hydroxyl group except:

A. Ethanol

B. Glycerol

C. Propanol

D. Butanol

E. Sorbitol

Compaction would probably be most significant as a lithification process for sedimentary rocks.

Lithification refers to the transformation of loose sediments into solid rocks. It involves several processes, and compaction is one of the most significant processes in the lithification of sedimentary rocks. Compaction occurs when the weight of overlying sediments compresses the underlying layers. This process is facilitated by the gradual removal of water and air from the sediments.

During compaction, the grains within the sediment are squeezed together, reducing the pore space between them. The pressure exerted by the weight of the overlying sediments causes the grains to rearrange and become more tightly packed. This results in a decrease in the overall volume of the sediment and an increase in its density.

Compaction plays a crucial role in the formation of sedimentary rocks because it helps to remove water and air, promoting the consolidation and solidification of sediments. It contributes to the development of cohesive and coherent rock structures, transforming loose sediments into solid, cohesive rock formations. As a result, compaction is a vital process in the formation of sedimentary rocks, such as sandstone, shale, and limestone.

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Answer:

If Black Holes Are "Black," How Do Scientists Know They Are There? A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole.

Explanation:

some examples; 1. Pushing a wheel barrow.

2. Opening or closing a door.

3. Squeezing wet clothes.

4. Gravitational force.

5. Brakes applied to stop a moving vehicle.

6. A football kicked harder that decreases due to the frictional force.

7. Rubbing a glass rod with a silk.

8. Pressure applied on a pin of a notice board.

9. Running

10. Pushing

Supernova or void is another force or phenomenon that cannot be seen directly similar to black holes.Examples of the effects are gravitational force, brakes applied to stop a moving vehicle.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

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\({ \qquad\qquad\huge\underline{{\sf Answer}}} \)

Here we go ~

Mass of 1 mole C - 12 atom = 12 g

So, mass of 1 carbon - 12 atom = ( 12 / 1 mole ) g

that is :

\(\qquad \sf  \dashrightarrow \: \cfrac{12}{6.022 \times 10 {}^{23} } \: \: g\)

[ since 1 mole = 6.022 × 10²³ ]

\( \qquad \sf  \approx2 \times 10 {}^{ - 23} \: \: g\)

Molarity :

Molarity is defined as " The number of moles of solute present in per litre of solution "

Molality :

Molality is defined as " Number of moles of solute present per kg mass of solvent "

As per the given reaction ~

\(\qquad \sf  \dashrightarrow \: Zn + 2\:H Cl \rightarrow ZnCl_2 + H_2\)

32.65 g of zinc reacted,

[ Number of moles of zinc reacted = mass of zinc reacted divided by its formula Weight ]

\(\qquad \sf  \dashrightarrow \: number \: \: of \: \: moles = \cfrac{32.65}{65.3} \: \: mol\)

\(\qquad \sf  \dashrightarrow \: number \: \: of \: \: moles = \cfrac{1}{2} \: \: mol\)

so, we can say that " half mole Zinc reacted with 1 mole of HCl to form half mole of Zinc chloride and half mole of Hydrogen gas "

And we already know that 1 mole of any gas occupies 22.7 litre volume at STP.

So, volume of Hydrogen gas Liberated :

\(\qquad \sf  \dashrightarrow \: \cfrac{1}{2} \times 22.7\)

\(\qquad \sf  \dashrightarrow \: 11.35 \: \: litres\)

The relationship between Molarity and molality can be expressed as :

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000(m \times d)}{1000+(m \times F)}\)

Terms :

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000(3 \times 1.110)}{1000+(3 \times 40)}\)

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000( 3.330)}{1000+120}\)

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 3330}{1120}\)

\(\qquad \sf  \dashrightarrow \: M =2.973 \: mol \: l {}^{ - 1} \)

A concentration of at least 1.7 x 10⁻⁵ M of Ag⁺ ions is required for the formation of a precipitate in 1.0 x 10⁻⁵ M NaCl solution.

Concentration refers to the amount of solute dissolved in a solvent, typically expressed in units of moles per liter (M).

The solubility product expression for AgCl is;

Ksp = [Ag⁺][Cl⁻]

We can assume that the concentration of Cl⁻ ions is equal to the initial concentration of NaCl, which is 1.0 x 10⁻⁵ M.

Therefore, we will rearrange the equation to solve for [Ag⁺];

[Ag⁺] = Ksp / [Cl⁻]

= (1.7 x 10⁻¹⁰) / (1.0 x 10⁻⁵)

= 1.7 x 10⁻⁵ M

Therefore, the concentration of silver ions is 1.7 x 10⁻⁵ M required.

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The 235 in Uranium-235 indicates the atomic mass of the isotope. Uranium-235 has 235 nucleons in its nucleus, which includes 92 protons (since uranium has an atomic number of 92) and 143 neutrons.

This particular isotope is significant because it can undergo nuclear fission, making it useful for nuclear power and weapons. The number 235 is important because it helps identify the specific isotope and its properties, such as its stability and potential uses.

About 0.72 percent of natural uranium is composed of the uranium isotope uranium-235 (also known as 235U or U-235). It is fissile, which means that it may support a nuclear chain reaction, in contrast to the dominating isotope uranium-238. As a primordial nuclide, it is the sole fissile isotope found in nature.

The half-life of uranium-235 is 703.8 million years. By 1935, Arthur Jeffrey Dempster had found it. It has a fission cross section of roughly 584.31 barns for slow thermal neutrons. It is around 1 barn for fast neutrons. The majority of neutron absorptions cause fission, while a small number also produce uranium-236.

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To produce 35.5g of H2, approximately 2055.49g of NaCl is required.

To calculate the mass of NaCl required to produce 35.5g of H2, we need to determine the stoichiometry of the reaction and use the molar mass of NaCl.

The balanced equation for the reaction is:

2NaCl + 2H2O -> 2NaOH + H2

From the balanced equation, we can see that for every 2 moles of NaCl, 1 mole of H2 is produced. We can use the molar mass of H2 (2.016g/mol) to convert the given mass of H2 into moles:

moles of H2 = mass of H2 / molar mass of H2

moles of H2 = 35.5g / 2.016g/mol

moles of H2 = 17.6 mol

Since the stoichiometry of the reaction is 2 moles of NaCl to 1 mole of H2, we can set up the following ratio:

moles of NaCl / moles of H2 = 2 / 1

Rearranging the equation to solve for moles of NaCl:

moles of NaCl = (moles of H2 * 2) / 1

moles of NaCl = (17.6 mol * 2) / 1

moles of NaCl = 35.2 mol

Now, we can calculate the mass of NaCl required using the molar mass of NaCl (58.44g/mol):

mass of NaCl = moles of NaCl * molar mass of NaCl

mass of NaCl = 35.2 mol * 58.44g/mol

mass of NaCl = 2055.49g

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Answer: B. Mass

Explanation: The quantity of matter anything contains is called mass.

Answer:

Carbon in carbon dioxide gas is taken in by plants for photosynthesis.

Plants turn the carbon atom into a carbohydrate.

An animal eats the plant and uses its carbohydrates for energy.

During respiration, the animal releases carbon dioxide back into the atmosphere.

Explanation:

Answer:

Carbon in carbon dioxide gas is taken in by plants for photosynthesis.

Plants turn the carbon atom into a carbohydrate.

An animal eats the plant and uses its carbohydrates for energy.

During respiration, the animal releases carbon dioxide back into the atmosphere.

Explanation:

True. The fact that the sky is dark at night demonstrates that the observable universe cannot extend forever. This phenomenon can be explained by Olbers' Paradox, which states that if the universe were infinite and uniformly filled with stars, the night sky would be uniformly bright instead of dark.

In an infinite universe, there would be an infinite number of stars, and each line of sight from Earth would eventually intersect a star. However, we observe a dark night sky because the universe is not infinite in size or age. The universe has a finite age of around 13.8 billion years, as indicated by the Big Bang theory. Due to this finite age, light from stars in the distant universe has not yet reached Earth, thus creating darkness in the night sky.
Additionally, the universe is expanding, causing galaxies and stars to move away from each other. This expansion leads to the redshift of light, which causes the light emitted by distant objects to move towards the red end of the electromagnetic spectrum and eventually become undetectable.
In conclusion, the darkness of the night sky supports the notion that the observable universe is not infinite. The finite age and expansion of the universe, along with the redshift phenomenon, contribute to the darkness we observe during the night.

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The answer is A.

Only plant cells contain a cell wall.

Answer:

Static Electricity

Explanation:

Answer:

static electricity

Explanation:

The given statement "Formalin and methanol are both synonymous with formaldehyde" is False because formaldehyde is a distinct chemical compound, while formalin is a solution containing formaldehyde and methanol.

Formaldehyde is a simple organic compound with the formula CH2O. It is a colorless, flammable, strong-smelling gas that is commonly used in various industrial applications and as a preservative in medical laboratories. Formalin, on the other hand, is an aqueous solution containing about 37% formaldehyde by weight, along with a small amount of methanol. The methanol is added to prevent the formaldehyde from forming paraformaldehyde, a white solid polymer that precipitates out of the solution.

Formalin is commonly used as a disinfectant, fixative, and preservative for biological specimens and tissues. Methanol, also known as methyl alcohol or wood alcohol, is an entirely different compound with the formula CH3OH. It is a colorless, volatile, and flammable liquid that is used as an industrial solvent, antifreeze, and fuel additive. Methanol is toxic and can be harmful if ingested, inhaled, or absorbed through the skin.

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A chemical production company annually produces 500 million pounds of the chemical maleic anhydride using four different reactors. Each reactor can be run on only one of the four settings.

This means that each reactor contributes to the production process by running on a specific setting. The specific settings may vary depending on factors such as temperature, pressure, or other variables relevant to the production of maleic anhydride.

By utilizing all four reactors and their respective settings, the company can achieve the desired annual production of 500 million pounds. Each reactor plays a crucial role in the overall process, ensuring that the necessary quantity of maleic anhydride is produced efficiently and effectively.

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We first verify that the equation is balanced. We have 5 carbons (C), 2 sulfurs (S), and 4 oxygens (O) on each side of the reaction. So the reaction is balanced.

a) Now if we look at the reaction we can see that when 2 moles of SO2 react, 1 mole of CS2 is produced. That is, the ratio is 2 to 1. For each mole of SO2 half as many moles of CS2 will be produced.

So if we have 9.5 moles of SO2 we will have 9.5/2 moles, that is 4.75 moles of CS2.

Answer a) By reacting 9.50 moles of SO2 with an excess of it would be produced 4.75 moles of CS2.

Now, for the following parts of the question, we can apply the ideal gas law. This is because the reaction is in the gas phase and the law applies only to gases.

Where,

P= Pressure at STP = 1 atm

T= Temperature at STP = 273.15K

R= Ideal law constant = 0.08206 (atm L)/(mol K)

V= Volume of the gas

n= Numer of moles

b)We clear n and we replace the known values of SO2 to find the number of moles of SO2 that react.

Now, for each mole of SO2 that reacts we need 5/2 moles of C, that is 0.24x5/2=0.61 moles of C.

We use mass molar of C to calculate the grams.

Mass molar of C=12.01g/mol

Mass of C= Moles of C x Mass Molar

Mass of C= 0.61 mol x 12.01 g/mol = 7.37 g

So, To fully react 5.5 L of SO2 at STP we will need 7.37 g of C.

c)We apply the gas law again but this time we clear the volume.

We also take into account that for each mole of C, 4 moles of CO are produced, so if we have 20 moles of C we will produce 20x4=80 moles of CO.

So, from 20.0 moles of C at STP can be produced 1793.18 liters of CO

Sun-Bleached hair.

You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).

Hope this helps and have a nice day.

-R3TR0 Z3R0

Answer:

Extractive metallurgy

Explanation:

Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.

The balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

Given equation: 3O2+4Co⟶2Co2O3Using the symbol e− for an electron. The redox reaction can be broken down into two half-reactions. The reduction half-reaction is the one in which a species gains electrons and the oxidation half-reaction is the one in which a species loses electrons. The half-reactions are as follows: Reduction Half-reaction Half-reaction equation: O2 + 2e- → 2O2 -Oxidation number of oxygen in O2=0 and in O2^-= -1Charge on the left side = 0Charge on the right side = 2 x (-1) = -2Thus, 2 electrons are added to the left side to balance the charge, making the half-reaction:O2 + 2e- → 2O2 -Oxidation Half-reaction Half-reaction equation: 4Co → 4Co2+ + 8e-Oxidation number of cobalt in Co=0 and in Co2+ =+2Charge on the left side = 0Charge on the right side = 4 x (+2) + 8 x (-1) = -4Thus, 8 electrons are added to the right side to balance the charge, making the half-reaction:4Co → 4Co2+ + 8e-Thus, the balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

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C2H2 will be left  when the burning is complete.

The equation of the reaction is; 2C2H2 + 5O2 --> 4CO2 + 2H2O

The number of moles of C2H2 reacting is = 1.20 g/26 g/mol = 0.046 moles

The number of moles of O2 is = 3.50 g/32 g/mol = 0.109 moles

Since;

2 mole of C2H2 reacts with 5 moles of O2

x moles of C2H2 reacts with 0.109 moles of O2

x = 2 mole × 0.109 moles/5 moles

x = 0.044 moles of C2H2.

It then follows that C2H2 is the reactant in excess so C2H2  will be left  when the burning is complete.

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Answer:

Nuclear energy

I'm not sure ok.. Better ask some adult for making sure.