What is the [OH−] in 0.20 M oxalic acid, (COOH)2, solution?
a. 4.1 × 10−10 M
b. 7.4 × 10−11 M
c. 1.2 × 10−13 M
d. 3.2 × 10−12 M
e. 3.8 × 10−12 M

Answer:

Li

Explanation:

According to periodic table, lithium will be the most reactive element because reactivity decreases down the group

A 545 mL volume of concentrated hydrochloric acid should be used to prepare 7 L of a 0.8 mol/L HCl(aq) concentration solution.

Calculate the number of moles of HCl required for the desired solution:

  Moles of HCl = Concentration × Volume

                         = 0.8 mol/L × 7 L = 5.6 moles

Determine the mass of HCl required:

  Mass of HCl = Moles of HCl × Molar Mass of HCl

  The molar mass of HCl is approximately 36.46 g/mol.

  Mass of HCl = 5.6 moles × 36.46 g/mol = 204.376 g

Calculate the mass of concentrated hydrochloric acid needed:

  Concentrated hydrochloric acid has a concentration of 37.5% HCl in mass.

  Mass of concentrated HCl = Mass of HCl / Percentage of HCl

  Mass of concentrated HCl = 204.376 g / 0.375 = 545.003 g

Determine the volume of concentrated hydrochloric acid using its density:

  Density = Mass / Volume

  Volume = Mass / Density

  Volume = 545.003 g / 1.2 g/cm³

  As we want the volume in milliliters (mL), we need to convert cm³ to mL:

  Volume = 545.003 mL / 1 cm³ = 545.003 mL

Therefore, approximately 545 mL of concentrated hydrochloric acid should be used to prepare 7 L of a 0.8 mol/L HCl(aq) concentration solution.

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The insolubility of calcium sulfide (CaS) in water is due to weak ion-dipole interactions, strong ion-ion interactions, the presence of covalent bonds, and a decrease in entropy upon dissolution.

These factors prevent CaS from dissolving in water and result in its insoluble nature. Calcium sulfide (CaS) is insoluble in water due to several reasons:
1. Ion-dipole interactions: When a salt dissolves in water, the positive ions are attracted to the negative end of water molecules (oxygen atom), and the negative ions are attracted to the positive end of water molecules (hydrogen atoms). However, in the case of calcium sulfide (CaS), the ion-dipole interactions between the calcium ions (Ca2+) and water molecules are very weak. This means that the attraction between the Ca2+ ions and water molecules is not strong enough to overcome the strong attraction between the Ca2+ ions and the sulfide ions (S2-), resulting in the insolubility of CaS in water.

2. Ion-ion interactions: In the case of salts containing Ca2+ ions, they are generally insoluble in water. This is because the ion-ion interactions between the Ca2+ and sulfide ions (S2-) are very strong. The attractive forces between these ions are much stronger than the attractive forces between the ions and water molecules. As a result, the Ca2+ and sulfide ions remain together as a solid rather than dissolving in water.

3. Covalent bonds: Another reason for the insolubility of CaS in water is the presence of covalent bonds in the compound. In CaS, the calcium and sulfur atoms are bonded together by covalent bonds. Covalent bonds are formed by the sharing of electrons between atoms. Breaking these covalent bonds requires a significant amount of energy. Therefore, for CaS to dissolve in water, the energy required to break the covalent bonds would be too high, making it unlikely for the compound to dissolve.

4. ΔS (change in entropy): When a substance dissolves in water, there is often an increase in the disorder or randomness of the system, which is indicated by a positive change in entropy (ΔS). However, in the case of CaS, the possible arrangements for water molecules would decrease upon dissolution, resulting in a negative change in entropy (ΔS). This decrease in entropy further contributes to the insolubility of CaS in water.

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Answer:

To find the empirical formula of a compound, we need to determine the simplest whole number ratio of the atoms present in the compound. Let's assume we have 100 g of this compound. Then we have 79.3 g of tungsten and 20.7 g of oxygen. We can convert these masses to moles by dividing by their respective atomic masses: Number of moles of W = 79.3 g / 183.84 g/mol = 0.431 mol Number of moles of O = 20.7 g / 16.00 g/mol = 1.294 mol To get the simplest whole number ratio of the atoms, we need to divide both of these values by the smallest value, which is 0.431 mol: 0.431 mol W / 0.431 mol = 1 1.

An insoluble precipitate is less effective to wash than a soluble precipitate. This is because insoluble precipitates are composed of particles that do not dissolve in water.

When a substance is insoluble, it cannot mix uniformly with water to form a solution.

As a result, when attempting to wash an insoluble precipitate, water can only clean the surface of the particles rather than reaching and cleansing the entire precipitate.

Consequently, the effectiveness of washing insoluble precipitates is diminished.

A precipitate refers to a solid substance that forms when two solutions are combined and a chemical reaction occurs, leading to the formation of an insoluble compound.

Precipitates can exist in two forms: soluble or insoluble, depending on the characteristics of the compound involved.

The process of washing a precipitate is important to eliminate any impurities or undesired substances that may be present.

To wash a precipitate, a wash solution is added to the mixture, which is typically a liquid capable of dissolving any soluble impurities or contaminants within the precipitate.

After the wash solution is added, the mixture is filtered to separate the precipitate, which is then dried and collected.

While soluble precipitates can be effectively washed by dissolving impurities, insoluble precipitates pose a challenge as they cannot dissolve in water, leading to limited cleansing of the precipitate particles.

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Here is the higher energy chair conformation of cis-1,3-dimethylcyclohexane:

     CH3           H

      |             |

H--C--C--C--C--C--C--C--H

      |             |

     CH3           H

In this conformation, the two methyl groups are in an axial position, which is less stable than the equatorial position. The hydrogen atoms on the same side of the ring as the methyl groups are also in axial positions, which contributes to the higher energy of this chair conformation.

A higher energy chair conformation is a specific arrangement of substituents on a cyclohexane ring that is less stable than the lowest energy or most stable chair conformation. In the higher energy chair conformation, one or more substituents are located in axial positions rather than equatorial positions, leading to destabilizing interactions with other groups or atoms in the molecule. This can result in an increase in potential energy, making the conformation less stable and more reactive than the most stable chair conformation.

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Answer: Neil Armstrong

Explanation

On July 20, 1969, Neil Armstrong became the first human to step on the moon. He and Aldrin walked around for three hours. They did experiments. They picked up bits of moon dirt and rocksExplanation:

Answer:

In 1969, Neil Armstrong was the first person to reach the moon.

Explanation:

Answer:

The answer is a

Explanation:

The definition of astronomic bodies are indicated below with the sentences defining them.

Astronomic bodies are celestial objects that occur naturally in space.

Here are their definitions below:


a. Supernova exhibits strong gravitational pull such that no light can escape

b. A nebula a large cloud of gas or dust in space.

c. A white dwarf is what a medium-mass star becomes at the end of it's life.

d. Protostar is the earliest stage of a star's life.

e. Black dwarf is a star left at the core of a planetary nebula.

f. Neutron stars are the remains of a high mass star.

g. A supernova is what occurs when a red supergiant star explodes.

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The pressure of PCI₃ in the equilibrium mixture is approximately 0.000954 atm.

To solve this problem, we can use the ideal gas law and the relationship between partial pressures and equilibrium constant (Kp) to find the pressure of PCI₃.

Given the balanced equation for the given reaction is:

PCI₃ (g) + Cl₂ (g) -> PCI₅ (g)

Let

P₁ = P(PCI₃) = equilibrium partial pressure of PCI₃

Given:

P(PCI₅) = 0.224 atm

P(Cl₂) = 0.284 atm,

Kp = equilibrium constant

Kp = [P(PCI₅) * P(Cl₂)) / (P(PCI₃)]

Substituting the given values:

66.7 = (0.224 atm * 0.284 atm) / P₁

Now we can solve for P₁:

P₁ = (0.224 atm * 0.284 atm) / 66.7

P₁ = 0.000954 atm

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Answer:

81.6%

Explanation:

mass of acetylferrocene and ferrocene mixture = 22.092 g

mass ratio acetylferrocene and ferrocene mixture = 1 : 1

The sum of the ratios = 2, therefore the mass of each compound will be half the mass of the mixture

mass of each compound in the sample mixture = 1/2 * 22.09 2= 11.046 g

mass of recovered acetylferrocene = 9.017 g

percentage recovery = mass recovered/mass in sample * 100%

percentage recovery of acetylferrocene = (9.017 g / 11.046 g) * 100%

percentage recovery of acetylferrocene = 81.6%

Answer: D

Explanation:

The mitochondria is the power house of the cell, remember power as energy

C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.

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Answer:

True. If they're talking about the first orbital around the nucleus then yes, its true. The element will be unstable and die

Explanation:

Answer:

Two hydrogen atoms and one oxygen atom (water) was removed.

Explanation:

yw:))

Answer:

The percent natural abundance is 27.95% for the heavier isotope (86.901 amu)

Explanation:

The atomic mass of Rubidium (Rb) is 85.468.

To find the percent natural abundance, first we need to use the following equation:

84.912x + 86.901(1-x) = 85.468

x represents the percent natural abundance, in basic decimal form

In order to find x, we will use the distributive property, combine like terms and then move the constant to the other side to get x.

We are first finding the percent natural abundance of the first isotope to make this easier for us.

84.912x + 86.901(1-x) = 85.468

-> 84.912x + 86.901- 86.901x = 85.468

-> 86.901 - 1.989x  = 85.458      (like terms were combined)

-> Subtract both sides by 86.901

-> Divide both sides by-1.989x

x = 0.720462544

Now turn this into a percent by multiplying by 100.

--> 72.05% for the first isotope (the one that contains 84.912 amu)

To find the natural abundance of the other isotope (the denser, heavier isotope), you could just subtract 72.05 from 100 to save time, but the usually desired way (the way that your teacher would probably want you to do) is down below:

We plug this decimal for the x-value into the parentheses from earlier:

(1 -x) ---> ( 1 - 0.720462544 ) = 0.279537456

Now we just need to convert this to a percent by multiplying by 100

0.279537456 * 100 = 27.95% of the heavier isotope (86.901 amu)

Answer:

d

Explanation:

Answer:

D

Explanation:

IM JUST THAT DUDE

According to the given information Colloidal suspensions are solutions statement concerning solutions is false.

Milk, paint, and smoke are excellent illustrations of colloidal suspensions. As an illustration of a liquid colloidal in a liquid, the milk of cows, goat, and other creatures is a suspensions of granules in liquid water. Suspensions are nevertheless regarded as heterogeneous because, in the absence of vigorous mixing, the various components of the mixture won't stay uniformly dispersed.

Aerosols, that are dispersions comprising solids or liquids in a gas, and emulsified, which have been aerosols of one liquid in an another fluid in which it is immiscible, are two more significant types of colloids. The scattered particles in an emulsion are heterogeneous mixtures that are in size somewhere between that of a solution and.

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The percentage of excess air used during combustion process of ethane will be 37 %.

Burning, also known as combustion, would be a high-temperature highly exothermic chemical process that occurs when an oxidant, typically atmospheric oxygen, interacts with a fuel to generate oxidized, frequently gaseous products in a mixture known as smoke.

Calculation of percentage of air .

\(C_{2} H_{6} + (1-x)+a(O_{2} +3.76N_{2} )=bCO_{2} + cH_{2} O + axO_{2} + 3.76dN_{2} .\)

Mair=Mair/Rin

\(( MN)O_{2}\) + \((MN)N_{2}\)÷ \((MN)O_{2}\) + \((MN)N_{2}\) +\((MN)C_{2} H_{6} .\)

33 . 3.25(1-x) + 28 × 13.16(1-x) ÷ 33 × 3.25(1-x) + 28 × 13.16(1-x). + 30.1

= 176/176+8

X= 0.37

0.37 × 100

X= 37%

Therefore, the percentage of excess air used during combustion process of ethane will be 37 %.

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CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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the ag | agcl and calomel reference electrodes are saturated with kcl.

a) +0.326 V vs Ag/AgCl for 0.523 V vs Ag/AgCl

    +0.523- 0.197= 0.326

e) 0.021 V vs Ag/AgCl

+0.218-0.197= 0.0021

Calomel  reference electrode is a salt electrode that is readily soluble in metals. It serves as a supplemental reference electrode to ascertain the electrode's standard potentials. Construction: The electrode is made of a glass tube with a bent side tube and another side tube, designated B.

Using a platinum wire contained in a glass tube and submerged in a layer of mercury, an external electrical contact is created. A salt bridge and the side tube come into touch electrically. The calomel electrode can act as either an anode or a cathode depending on the makeup of the other electrodes in the cell.

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Answer:28.411

Explanation: f1 m1+ f2 m2+ f3 m3

0.6628(28)+0.2634(29)+0.0738(30)=28.411

remember that for percentages you divide the number by 100 to get the decimal form.

The average atomic mass of the element given in the question above is 28.411 amu

The average atomic mass of an element existing in various isotopic form can be obtained by using the following formula:

Average atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100] + [(Mass of C × C%) / 100]

Where

With the above formula, we can obtain the average atomic mass as follow:

Average atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100] + [(Mass of C × C%) / 100]

Average atomic mass = [(28 × 66.28) / 100] + [(29 × 26.34) / 100] + [(30 × 7.38) / 100]

Average atomic mass = 18.5584 + 7.6386 + 2.214

Average atomic mass = 28.411 amu

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Easier and pollutuion are correct answer of this question . Click oil basics and use the information to complete this passage that discusses how plastic production affects society.

What is Pollution?

Pollution, also known as environmental pollution, is the addition of any material (solid, liquid, or gas) or energy (such as heat, sound, or radioactivity) to the environment at a rate greater than it can be dispersed, diluted, decomposed, recycled, or stored in an innocuous form. The three basic sources of pollution—air, water, and land—are frequently categorised according to their effects on the ecosystem. Modern society is also concerned about certain types of pollution, such as plastic, light, and noise pollution. The environment, wildlife, and human health are all routinely negatively impacted by pollution of many forms.

Therefore, pollution can be defined simply as something that contaminates the environment. Pollution is the presence of dangerous compounds in the air, land, and water that can harm both living things and the environment. referring to dangerous substances that are released or brought into the environment, such as hazardous gases, liquids, or other poisonous materials. Pollutants, contaminants, or dangerous chemicals are other factors that contribute to the environment's unsuitability or safety, as are poisonous materials that contaminate the soil and the air. Pollution is another unavoidable side consequence of actions that disturb the ecosystem's biodiversity. Additionally, it jeopardises the environment's ability to endure.

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Answer:

14. Mechanical Weathering

15. & 16. I'm not sure

17. Smaller Pieces, Minerals I think

18. I can't remember

Explanation:

I'm not 100% sure about these but I hope they help. Sorry I couldn't do any more.

Answer:

To understand this first we must understand what is happening at the molecular level. When we heat any substance it changes its state of matter because its molecules get excited. For example, when we heat water it turns into gas so the molecules get excited. The hot air balloon will move faster if we add heat because the gas molecules will get excited and push against the balloon, making it faster. If we start removing heat, the balloon's acceleration will slow down because the molecules will get less excited.

Hot air balloons flies by means of it being lighter than air

The flame can be used to move the pilot to different directions by increasing the temperature of the air in the balloon and therefore, the volume, therefore, decreasing the density of the air which changes the elevation of the balloon to the appropriate elevation having winds moving in the desired direction

The principle by which the above process works is as follows:

According to Charles law, the volume of a mass of gas is directly proportional to its Kelvin temperature

V ∝ T

\(\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}\)

\(V_2 = T_2 \times \dfrac{V_1}{T_1}\)

\(Density, \rho = \dfrac{Mass, \ m}{Volume, \ V}\)

Therefore, as the temperature is increased, the volume occupied the mass gas increases, and therefore, the density decreases

The principle on which the hot air balloon operates on is the principle that hot air is less dense than and therefore, rises above cool air

Therefore, the pilot of an hot air balloon heats up the air in the balloon to allow the balloon to rise and the pilot switches off the burner so that the air in the balloon cools and the balloon looses altitude

The mechanism of the hot air balloon does not have a steering, and therefore, the wind direction is used to steer the balloon

The direction of the wind is different at different altitude, such that by obtaining the direction of the wind at a given altitude, the pilot can raise or lower the balloon up or down to the altitude having the desired wind direction, by increasing the temperature of the air in the balloon by switching on the burner to go to a higher altitude, or by switching off the burner so the air in the balloon cools and the balloon loses some of its altitude to reach the wind going in the direction of the pilot

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In the given electrolytic cell setup having molten zinc iodide as the electrolyte, reduction of zinc ions to gray coloured zinc occurs at the cathode, whereas iodide ions get oxidized to reddish-brown iodine at the anode.

An electrolytic cell is a type of electrochemical cell that uses an external source of electrical energy to power a chemical process that would not occur otherwise. This contrasts with a galvanic cell, which serves as a power source and the cornerstone of a battery.

Any apparatus in which electrical energy is changed into chemical energy or vice versa is an electrolytic cell. Such a cell normally consists of two electrodes, which can be metallic or electronic conductors, kept apart from one another and in contact with an electrolyte, which is commonly an ionic substance that has been dissolved or fused.

In the given setup, the molten zinc iodide is the electrolyte, and the half reactions occurring at the two electrodes of the electrolytic cell are:

Half reaction at the cathode:

\(Zn^{2+} (l) + 2e^- \rightarrow Zn (s)\)

Half reaction at the anode:

\(2I^- (l) \rightarrow I_2 (s) + 2e^-\)

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Based on the observations provided, the order of increasing density for the four unknown substances is:

b < c < d < a

b. substance b floated in water, but sank in toluene.

c. substance c sank in water, but floated in chloroform and nitromethane.

d. substance d sank in nitromethane, but did not sink as rapidly as substance a did in nitromethane.

substance a sank in chloroform

Density is a physical property of matter that describes the amount of mass per unit volume of a substance. It is a measure of how tightly packed the particles in a substance are. The formula for density is:

Density = Mass / Volume

Substance b floated in water, but sank in toluene. This means that substance b is less dense than water but more dense than toluene.

Substance c sank in water, but floated in chloroform and nitromethane. This means that substance c is less dense than water but more dense than chloroform and nitromethane.

Substance d sank in nitromethane, but did not sink as rapidly as substance a did in nitromethane. This means that substance d is more dense than nitromethane, but less dense than substance a.

Substance a sank in chloroform. Since none of the other substances sank in chloroform, this means that substance a is the most dense of the four unknown substances.

Therefore, the more dense substances sank down compared to other with lower density.

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Answer:

Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.

Answer:

Half of the solar radiation is absorbed and converted to infrared (heat).

Explanation: