Find the percent composition of a sample containing 1.29 grams of carbon and


1.71 grams of oxygen.

As per the given value of \([H^+]\), the pOH of the solution is 9.

To calculate the [OH-] s well as a pH of a solution with a given [H+], we can use the equation:

pH + pOH = 14

Given that:

\([H^+] = 1.0*10^{-5} M\)

First we need to Calculate [OH-]

We know that, water undergoes autoionization to form H+ and OH- ions, we can use the following equation:

\([H^+] * [OH^-] = 1.0*10^{-14} M^2\)

Plugging in the given [H+] value, we have:

\((1.0*10^{-5 }M) * [OH^-] = 1.0*10^{-14} M^2\)

Solving for [OH-]:

[OH-] = \((1.0*10^{-14} M^2) / (1.0*10^{-5} M) = 1.0*10^{-9} M\)

Therefore, the [OH-] of the solution is \(1.0*10^{-9\) M.

Now we need to Calculate pH

Using the relationship between [H+] and pH:

pH = -log[H+]

Plugging in the given [H+] value:

pH = -log(1.0x\(10^{-5\)) = 5

Therefore, the pH of the solution is 5.

Next is to Calculate pOH

Using the equation:

pOH = 14 - pH

Plugging in the calculated pH value:

pOH = 14 - 5 = 9

Therefore, the pOH of the solution is 9.

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The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

The SI unit of force is the newton, symbolised as N. The base units suitable to force are: metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

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The acceleration of the objection is 0.9375 m/s² if the players still push with a force of 150 N.

The word 'force' has a very precise meaning. Force can be described as push or a pull. A force is not something that an object contains or has in it. A force is exerted on one object by another. The idea of a force is not confined to living things or non-living things.

From the formula:

F = ma

a = F/m

a = 150/160

a = 0.9375 m/s²

Thus, the acceleration of the object is 0.9375 m/s² if the players still push with a force of 150 N.

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2 kg of expanded polyethylene has a volume of 2.17 liters.

Given that,

Density = 0.9g/cm³

Mass = 2kg = 2000g

Density is the substance's mass per unit of volume. Although the Roman letter D may also be used, the sign most frequently used for density is ρ (the lowercase Greek letter rho). A substance's density changes as a function of pressure and temperature. With solids and liquids, this variance is often slight, but for gases, it is much more pronounced.

Density = Mass ÷ Volume

0.92 = 2000 ÷ Volume

Volume = 2000 ÷ 0.92

Volume = 2.17 liters.

Hence, 2 kg of expanded polyethylene has a volume of 2.17 liters.

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Your question is in Spanish. The English translation of the question is:

Calculate the volume of 2 kg of expanded polyethylene in liters. ( Density = 0.92g/cm³ )

The movement of electrons is always depicted by curved arrows. From the tail to the head, electrons migrate.

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Using NAD and NADH reaction for the oxidation of methanol CH₃OH to formaldehyde, in which NAD is the oxidizing agent and then alcohol oxidase was crystallized after purification by ammonium sulfate precipitation

Oxidation means a process in which a chemical substance changes because of the addition of oxygen

Methanol was oxidized to formaldehyde by an alcohol oxidase and the reaction are

CH₃OH+O₂ → HCOH + H₂O₂

And the cofactor found in two form of cell and NAD is an oxidizing agent and it accept the electron of other molecule and reduced and this reaction is also with H⁺ form NADH which can be used as the reducing agent to donate electron and this reaction gives alcohol oxidase was crystallized after purification by ammonium sulfate precipitation

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Answer: 15.999 grams.

Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.

\(15.999gO*\frac{1molO}{15.999gO} =1molO\)

I hope this helps! Pls mark brainliest!! :)

To find the pH of the solution, we first need to calculate the concentration of acetate ions in the solution after the addition of sodium acetate.

We can start by calculating the number of moles of sodium acetate added:
1.43 g NaCH3CO2 x (1 mol NaCH3CO2 / 82.03 g NaCH3CO2) = 0.0174 mol NaCH3CO2
Since sodium acetate fully dissociates in water, we know that the number of moles of acetate ions in the solution is also 0.0174 mol.
Next, we need to calculate the new concentration of acetic acid in the solution. We can use the equation for the ionization of acetic acid:
CH3CO2H ⇌ CH3CO2- + H+
Ka = [CH3CO2-][H+] / [CH3CO2H]
At equilibrium, the concentration of acetic acid will be reduced by the amount of acetate ions that were added, so:
[CH3CO2H] = 0.21 M - 0.0174 M = 0.1926 M
We can now use the equilibrium equation and the given Ka value to solve for the concentration of H+ ions, and thus the pH:
1.8 x 10^-5 = (0.0174 M)(x) / (0.1926 M)
x = 1.576 x 10^-4 M
pH = -log[H+] = -log(1.576 x 10^-4) = 3.804
Therefore, the pH of the solution is approximately 3.804.

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Answer:

3... uhm I'm not sure it could 2

Answer:

An insect would have an easier time walking on the surface of water than on the surface of ethanol.

Water's stronger intermolecular forces lead to higher surface tension.

Higher surface tension allows water to support the insect.

Answer:

An insect would have an easier time walking on the surface of water than on the surface of ethanol.

Water's stronger intermolecular forces lead to higher surface tension.

Higher surface tension allows water to support the insect.

Explanation:

Answer:

36

Explanation:

I´m hoping this is correct

If you add 6 + 6 you get 12, multiply the 12 to get 24 and you multipy 6 times 2 to get 12 and add 12 to 24 to get 36.

The weight percentage of the solute in a solution can be calculated from the total weight of the solution determined. The weight percentage of KHP in the sample is 84.03 %.

Weight percent of a component of a sample is the weight fraction of that component in the total weight of the sample. Thus it is the ratio of weight of the solute to the total weight of the solvent.

Here the molarity of the solution is 0.100 M and volume is 36.0mL, from this the number of moles of NaOH, is 0.036 L × 0.100 M = 0.0036 moles. The molar mass of NaOH is 40 g/mol. Thus the weight of 0.0036 moles is 40  × 0.0036 = 0.902 g.

Thus, the percent of KHP in the sample is calculated as follows:

percent = 0.758 /(0.902 +0.758 ) ×100

             = 84.03%.

Hence, percent of KHP in the sample is 84.03.

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Answer:

I'm gonna say igneous

Explanation:

The texture looks rough and the rock looks like it's composed of different types of minerals making it an igneous rock

I hope this helps :)

Answer: Igneous

Explanation: Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.

A base, according to the Arrhenius definition, is any species that increases the concentration of OH- in the solution. Some examples of bases are, NaOH, KOH, LiOH, all these substances will increase the concentration of OH when dissolved. Letter C

The Lewis structure of the element have been shown in the image attached.

The valence electrons of an atom or molecule are depicted in a simplified manner by the Lewis structure, commonly referred to as the Lewis dot structure or electron dot structure. Gilbert N. Lewis, an American scientist, created it.

The valence electrons of an atom are shown in a Lewis structure as dots surrounding the element's symbol. These dots' placement reveals details about the connectivity and atom-atom bonding in a molecule.

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Answer:

Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.

Explanation:

There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object. Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed. Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states. Transitions from an excited state to a lower-energy state resulted in the emission of light with only a limited number of wavelengths Atoms can also absorb light of certain energies, resulting in a transition from the ground state or a lower-energy excited state to a higher energy excited state. This produces an absorption spectrum, which has dark lines in the same position as the bright lines in the emission spectrum of an element. Bohr's model revolutionized the understanding of the atom but could not explain the spectra of atoms heavier than hydrogen.

Answer:

Erosion

Explanation:

Abrasion is a process of erosion which occurs when material being transported wears away at a surface over time. It is the process of friction caused by scuffing, scratching, wearing down, marring, and rubbing away of materials. ... Objects transported in waves breaking on coastlines cause abrasion.

The "Conjugate bases of strong acids do NOT behave as bases in solution" A is the correct alternative for the statement.

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To determine the amount of energy transferred to an alpha particle (4He), we need to know the specific context or process in which the energy transfer occurs.

However, in general, the energy transferred to an alpha particle can be calculated in certain scenarios. For example, in a nuclear reaction such as alpha decay, the energy transferred to the alpha particle can be determined by subtracting the total energy of the parent nucleus from the total energy of the daughter nucleus and any emitted particles.

It is also important to note that energy transfer can occur through various mechanisms, such as collisions, electromagnetic interactions, or chemical reactions. The calculation of energy transfer typically requires specific data and context related to the system and process involved.

If you can provide additional details or clarify the specific scenario in which the energy transfer is occurring, I would be happy to assist you further in calculating the amount of energy transferred to the alpha particle.

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Answer:

Ver explicacion

Explanation:

La gravedad es una fuerza que actúa a distancia. La fuerza que actúa entre la tierra y los cuerpos en ella es la fuerza gravitacional.

Es un ejemplo típico de una fuerza de acción a distancia.

Por lo tanto, la fuerza tat que existe entre la tierra y los cuerpos que se encuentran en ella es una fuerza de distancia.

To calculate the work that an object does when it moves covering a distance of 3000 meters when it is propelled by a force of 65 Newton, one of the principles of mechanics must be considered.

A force does work when there is a displacement of the center of mass of the body on which the force is applied, in the direction of said force.

The work of the force on that body will be equivalent to the energy necessary to displace it, so that:

W = F.d

Substituting the corresponding values in said formula:

F = 65N

d = 3000m

W = 65 N. 3000 m

W = 195000 W

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The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

Nonspontaneous reaction is a type of chemical reaction that does not support or give room for products to be formed at given conditions. For a reaction to be nonspontaneous,it must be an endothermic reaction that is heat is absorbed from the surrounding and there must be decrease in entropy, or increase. The Gibbs free energy is positive.

Therefore, The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

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The spontaneous reactions have a positive enthalpy and a decrease in the entropy. In a non-spontaneous reaction, The Gibbs free energy for the reaction is positive. The correct option is C.

The chemical reactions which require an energy input to proceed or it can or cannot take place without the influence of external factors can be defined as the non-spontaneous reaction. In this case the total energy of the products is higher than that of the reactants.

Gibbs energy change is a better parameter which is used to determine the spontaneity or feasibility of a reaction. If ΔG is negative, the process will be spontaneous and if  ΔG is positive, the process is non-spontaneous in the forward direction.

Gibbs free energy is the sum of enthalpy plus the product of temperature in Kelvin and entropy of the system.

Thus the correct option is C.

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Bases are frequently used to alleviate dyspepsia. Antacids and other bases are frequently used to reduce acid reflux, heartburn, and indigestion symptoms by neutralizing excess stomach acid.

These bases reduce acidity by increasing the pH level in the stomach. This facilitates digestion and eases discomfort. The other options are not common ways to use bases. Not a base, vinegar is an acidic material. A sulfuric acid-based electrolyte solution, which is an acid and not a base, is used in car batteries. Foods can be made tart without bases; instead, acidic ingredients like lemon juice or vinegar are frequently employed in this capacity.

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Answer: D) To reduce indigestion

Explanation: because thats what it does :)

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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The nuclear equation :

₈₈Ra²²⁸ ⇒ ₋₁e⁰ + ₈₉Ac²²⁸

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,  

The sum of the mass number and atomic number before and after decay is the same

Ra = Radium ⇒alkaline earth, group 2, block s, period 7

Atomic mass = 88

If an element releases an β ₋₁e⁰,  the atomic number of the new element increases by 1

The new element will have an atomic number: 88+1=89 and mass number 288

The element having the atomic number 89 is Actinium(Ac)

So the nuclear equation :

₈₈Ra²²⁸ ⇒ ₋₁e⁰ + ₈₉Ac²²⁸

Answer:

Evaporation

Explanation:

Though it doesn't require high temperatures to do so

To calculate the pH of the solution, we first need to determine the concentration of hydroxide ions (\(OH^{-}\)) in the solution, since sodium oxide is a strong base that dissociates completely in water to give \(Na^{+}\) and \(OH^{-}\) ions.

We can start by calculating the number of moles of sodium oxide dissolved in the solution:

0.15 g \(Na_{2} O\) / (61.98 g/mol \(Na_{2} O\)) = 0.00242 mol \(Na_{2} O\)

Since sodium oxide dissociates completely in water to give two moles of sodium ions and one mole of hydroxide ions per mole of \(Na_{2} O\), we know that the number of moles of \(OH^{-}\) in the solution is:

0.00242 mol \(Na_{2} O\) x (1 mol \(OH^{-}\)/1 mol \(Na_{2} O\)) = 0.00242 mol \(OH^{-}\)

Next, we can calculate the concentration of hydroxide ions in the solution, which is given by:

[\(OH^{-}\)] = moles of \(OH^{-}\) / volume of solution in liters

[\(OH^{-}\)] = 0.00242 mol / (119.5 mL x 1 L/1000 mL) = 0.0203 M

Finally, we can calculate the pH of the solution using the equation:

pH = 14 - log [\(OH^{-}\)]

pH = 14 - log (0.0203) = 11.69

Therefore, the pH of the solution prepared by dissolving 0.15 g of sodium oxide in water is 11.69 to two decimal places.

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To determine whether a compound is aromatic, nonaromatic, or antiaromatic, we need to consider the compound's structure and its adherence to the rules of aromaticity. 1. Benzene (C6H6): Benzene is aromatic. It fulfills the criteria for aromaticity, which include a planar ring structure, conjugation of pi electrons, and a Huckel's rule of having 4n+2 π electrons (where n is an integer).

Benzene has a continuous ring of conjugated pi electrons (6 electrons), making it aromatic.  2. Cyclooctatetraene (C8H8): Cyclooctatetraene is nonaromatic. Despite having a planar ring structure and conjugation, it fails to fulfill the aromaticity criteria. It has 8 pi electrons, which is an even number, contradicting Huckel's rule for aromaticity.

3. Cyclobutadiene (C4H4): Cyclobutadiene is antiaromatic. It has a planar ring structure and conjugation; however, it has 4 pi electrons, which is an even number. According to Huckel's rule, for a compound to be aromatic, it must have 4n+2 pi electrons. Since cyclobutadiene has 4 pi electrons, it violates this rule and is classified as antiaromatic.

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The net ionic equation is; Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s),  Zn(s) + Pb²⁺(aq) → Zn²⁺(aq) + Pb(s), and 2Al(s) + 3Cd²⁺(aq) → 2Al³⁺(aq) + 3Cd(s)

A net ionic equation is a chemical equation that only includes the species that are involved in the reaction and excludes the spectator ions. Spectator ions are ions that do not participate in the reaction and do not undergo any chemical changes.

Anode; Pb(s) → Pb²⁺(aq) + 2e⁻

Cathode; 2Ag⁺(aq) + 2e⁻ → 2Ag(s)

Overall; Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s)

Net ionic equation; Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s)

Anode; Zn(s) → Zn²⁺(aq) + 2e⁻

Cathode; Pb²⁺(aq) + 2e⁻ → Pb(s)

Overall; Zn(s) + Pb²⁺(aq) → Zn²⁺(aq) + Pb(s)

Net ionic equation; Zn(s) + Pb²⁺(aq) → Zn²⁺(aq) + Pb(s)

Anode; Al(s) → Al³⁺(aq) + 3e⁻

Cathode; Cd²⁺(aq) + 2e⁻ → Cd(s)

Overall; 2Al(s) + 3Cd²⁺(aq) →2Al³⁺(aq) + 3Cd(s)

Net ionic equation; 2Al(s) + 3Cd²⁺(aq) → 2Al³⁺(aq) + 3Cd(s)

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Answer:

B. bedrock structure.

Explanation:

A landform refers to a geomorphic or natural feature of the Earth's surface, which typically makes its terrain. Some examples of landforms on planet earth are mountain, plains, valley, hills and plateau.

Basically, the tectonic plates such as the oceanic and continental lithosphere interact in three (3) ways and these are; divergent, transform and convergent boundaries.

A convergent plate boundary can be defined as a boundary where two (2) plates move towards each other, usually, resulting in subduction or collision. This action often causes mountain range such as the Himalayas to form by the collision between the plate carrying Eurasia and that of India; as a result of subduction which causes a plate to be forced underneath the mantle, deep ocean trenches are formed such as the Mariana trench.

The Catskills are commonly called mountains but are actually part of the Allegheny Plateau also referred to as Appalachian Plateau. The Catskills are classified as a plateau because of their bedrock structure which is caused by a valley, continental glaciers, and erosion from various watercourse.

Additionally, the Catskills is a mountain which got its name from early Dutch settlers in the United States of America.