acid strength decreases in the series: hi (strongest), hbr, hcl hf (weakest) each acid has its conjugate base, i-, br-, cl-, f-, respectively. which is the weakest base?

Phytoremediation is a cost-effective and environmentally friendly method of reducing pollutant concentrations and restoring contaminated ecosystems.

What is Pollutants?

Pollutants are substances or agents that contaminate the environment and have harmful effects on living organisms, natural resources, or the climate. Pollutants can be released into the air, water, or soil from natural sources or human activities such as industrial processes, transportation, agriculture, and waste disposal. Some common examples of pollutants include greenhouse gases, particulate matter, ozone, nitrogen oxides, sulfur dioxide, lead, mercury, pesticides, and plastic waste.

The method of using cattails in swamps to absorb chemical pollutants is called phytoremediation. Phytoremediation is a type of bioremediation that uses plants to remove, detoxify, or sequester contaminants from soil, water, or air. In this process, plants absorb contaminants through their roots or take them up from the air and store them in their tissues or metabolize them into less harmful forms. Cattails are particularly effective at removing organic pollutants such as pesticides, herbicides, and petroleum products, as well as heavy metals like lead, cadmium, and arsenic.

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The extrinsic pathway of coagulation is initiated by the exposed endothelial collagen. Endothelial cells are cells that line the interior surface of blood vessels, forming a barrier between the blood and the underlying tissues. Collagen is a protein that is an important component of the extracellular matrix that supports and strengthens tissues throughout the body.

The interaction of tissue factor with factor VIIa (the activated form of factor VII) triggers a series of reactions that ultimately lead to the activation of factor X and the formation of a blood clot. This process involves the formation of a complex known as the extrinsic tenase complex, which includes tissue factor, factor VIIa, calcium ions, and phospholipids. The extrinsic tenase complex activates factor X, which then leads to the activation of thrombin and the subsequent formation of fibrin, the protein that forms the basis of a blood clot.

The extrinsic pathway is called the "extrinsic" pathway because it is initiated by factors that are external to the blood itself, namely tissue factor. In contrast, the intrinsic pathway of coagulation is initiated by factors that are present within the blood itself, such as platelets and activated factor XII.

Overall, the extrinsic pathway of coagulation is an important component of the body's response to tissue injury, and it plays a critical role in preventing excessive bleeding and promoting wound healing.

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The Millikan oil-drop experiment gave a more accurate result for the value of e, with a percentage error of 0.002%. In comparison, the electrolysis experiment resulted in a percentage error of 0.06%.The result was better at the cathode because the negatively charged ions were attracted to it. Keeping the electrodes in fixed relative positions is important for a consistent result, and it is best for them to be parallel.

1. Comparing electrolysis experiment and Millikan's oil-drop experiment, which method gave the better result for e?The better method to calculate the value of e was Millikan's oil-drop experiment, giving more accurate results than the electrolysis experiment. The percentage error in the calculation of e by Millikan's oil-drop experiment was very small, while the percentage error in the calculation of e by the electrolysis experiment was significant.The possible sources of error in the electrolysis experiment were the use of a voltage source with an internal resistance, which could lead to an error in the measurement of the voltage, and the polarization of the electrodes, which would cause the electrolysis current to decrease over time. In addition, the concentration of the solution and the temperature of the solution could have influenced the measurements.  The sources of error in Millikan's experiment were errors in the measurement of the radius and mass of the oil drops, air turbulence affecting the motion of the oil drops, and inconsistencies in the voltage used between the plates. 2. Which electrode gave better results in the electrolysis experiment?The cathode provided a better result than the anode. Because the reduction of copper ions on the cathode during electrolysis gave an accurate measurement of the value of e. 3. Why should the electrodes be kept in fixed relative positions during the electrolysis?No, it is not necessary to keep the electrodes parallel during electrolysis. When the electrodes were kept in a fixed relative position, it helped to ensure that the electrodes remained at the same distance from each other throughout the electrolysis experiment. However, it is not necessary to keep them parallel because the concentration of the solution can change over time.The second electrolysis was more accurate than the first one. It is because we obtained the desired result, i.e., 3.3 x 10^{-19} C. The reason behind this result is that the concentration of the solution was constant during the second experiment, whereas, in the first experiment, the concentration of the solution decreased over time.

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Answer:

Magnetized objects move in the direction that reduces their magnetic potential energy. This is no different than the skate park.

Explanation:

The process of distillation involves heating the alcohol-containing solution, gathering the vapours, and then condensing them back into liquid form.

According to their boiling points, liquids are separated and purified using the distillation process. When it comes to alcohol, the solution is heated until the alcohol evaporates into a vapour, which is then collected and condensed back into a liquid state. A highly concentrated alcohol solution is produced as a result of this procedure, which enables the separation of the alcohol from other elements in the solution.

Alcoholic drinks including whisky, vodka, gin, and rum are made by distillation.

In the chemical industry, distillation is used to separate and purify various compounds and solvents.

In the process of refining petroleum, distillation is used to separate crude oil into several products, including gasoline, diesel, and kerosene.

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To eject electrons with 2.2 x 10^-19 J of energy is 1.42 x 10^15 Hz.

what is the photon frequency needed? Chromium metal has a binding energy of 7.21 x 10^-19 J for certain electrons. So, the energy needed to eject the electrons is: Energy needed = Binding energy + Ejected electrons' energy = 7.21 x 10^-19 J + 2.2 x 10^-19 J = 9.41 x 10^-19 JNow, we know the energy needed to eject electrons is 9.41 x 10^-19 J. And we know that the energy of a photon is given by E = hν, where h is Planck's constant and ν is the frequency of the photon. To find the photon frequency needed, we can use the equation:

E = hνν = E/hν = (9.41 x 10^-19 J) / (6.63 x 10^-34 J·s)ν = 1.42 x 10^15 Hz

Hence, the photon frequency needed to eject electrons with 2.2 x 10^-19 J of energy is 1.42 x 10^15 Hz.

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The actual absolute zero temperature in degrees Celsius is 273.15.

Experimental Value of Absolute Zero for Sample 1: -283.6°C

Percent Error for Sample 1: |(-283.6 - (-273.15)) / (-273.15)| x 100 = 3.8%

Experimental Value of Absolute Zero for Sample 2: -288.7°C

Percent Error for Sample 2: |(-288.7 - (-273.15)) / (-273.15)| x 100 = 5.7%

Using Sample 1:

P = 1.2 atm

V = 22.0 mL

n = (P * V) / (R * T)

n = (1.2 * 0.0220) / (0.0821 * (12+273))

n = 0.00075 mol

Using Sample 2:

P = 1.2 atm

V = 20.0 mL

n = (P * V) / (R * T)

n = (1.2 * 0.0200) / (0.0821 * (12+273))

n = 0.00069 mol

Conclusion:

The experimental absolute zero value for Sample 1 was -283.6°C with a percent error of 3.8% and for Sample 2 was -288.7°C with a percent error of 5.7%. The experimental absolute zero values were close to the accepted value of -273.15°C, with Sample 1 being closer than Sample 2. Therefore, the data supports the hypothesis that the relationship between volume and temperature of an ideal gas can be used to determine absolute zero.

Possible sources of error that could have impacted the results of this lab include experimental error in measuring the volume and temperature, as well as deviations from ideal gas behavior due to factors such as intermolecular forces.

The investigation can be explored further by testing the effects of changes in pressure and number of moles on the relationship between volume and temperature in ideal gases.

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Answer: -230 N

Explanation:

The electrical force between two point charges q1 and q2 separated by a distance r is given by Coulomb's law:

F = k * (q1 * q2) / r^2

where k is the Coulomb constant, q1 and q2 are the magnitudes of the charges, and r is the distance between them.

In this case, we have a positive charge and a negative charge, which means that q1 and q2 have opposite signs. Let's assume that the positive charge has a magnitude of q and the negative charge has a magnitude of -q. Then, the electrical force between them can be calculated as:

F = k * (q * (-q)) / r^2 = -k * q^2 / r^2

Substituting the given values of e and k, we get:

F = - (8.99 × 10^9 N m^2/C^2) * (1.6 × 10^-19 C)^2 / (10^-15 m)^2 ≈ -230 N

Note that the negative sign indicates that the force is attractive, which is expected for opposite charges. Therefore, the correct answer is:

-230 N.

The type of mixture whose components are evenly distributed throughout is a homogeneous mixture.

A homogeneous mixture is a mixture in which the components are uniformly distributed throughout. The mixture appears to be the same throughout, and it has the same physical and chemical properties throughout. The composition of the components of a homogeneous mixture is uniform. An example of a homogeneous mixture is a solution of sugar and water. Sugar dissolves in water to form a homogeneous mixture. Another example is salt and water. Salt dissolves in water to form a homogeneous mixture.

However, These are the kinds of combinations where the ingredients are evenly dispersed throughout. In other words, "they are consistent throughout. In a homogenous mixture, we can only see one phase of the substance and components are evenly distributed throughout .

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The density of the gas at 84° C and 721 mm Hg will be 2.50 g/L.

The density of a gas can be calculated using the following formula:

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Where, Density is the density of the gas in grams per liter. Pressure is the pressure of the gas in millimeters of mercury (mm Hg). Molar mass is the molar mass of the gas in grams per mole. Gas constant is the universal gas constant (0.08206 L atm / mole K). Temperature is the temperature of the gas in kelvin (K).

Now, let's find the density of the gas at 34° C and 745 mm Hg. The temperature should be converted from Celsius to Kelvin. Temperature (K) = 34 + 273 = 307 K

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Density = (745 x Molar Mass) / (0.08206 x 307)

Density = 28.91 x Molar Mass g/L

Also, we need to find the molar mass of the gas. Since we don't know which gas it is, we'll use the formula,

Molar Mass = Density x (Gas Constant x Temperature) / Pressure

Molar Mass = 1.87 x (0.08206 x 307) / 745

Molar Mass = 0.103 g/mol

Now, we can find the density of the gas at 84° C and 721 mm Hg.

Temperature (K) = 84 + 273 = 357 K

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Density = (721 x 0.103) / (0.08206 x 357)

Density = 2.50 g/L

Therefore, the density of the gas at 84° C and 721 mm Hg will be 2.50 g/L.

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Root mean square (RMS) average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C is 2.233 × 10⁻⁴m/s.

The root mean square (rms) average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C can be calculated as follows:

Given data:  Pressure, P = 0.17atm              Temperature, T = -52°C = 221 K

Atomic weight of Neon, m = 20.18 g/mol = 20.18 × 10^-3 kg/molR = 8.314 J/mol KKB = R/NA = 1.38 × 10^-23 J/K (Boltzmann constant).

The root mean square (rms) velocity of gas is given by the equation:rms velocity, vrms = [3KB T/m]^1/2where, m = molar mass of gas, T = temperature, and KB = Boltzmann constant.

Substituting the given data, we get:v(rms) = [3KB T/m]^(1/2)v(rms) = [3KB T/m]^(1/2)v(rms) = [3 × (1.38 × 10^-23 J/K) × 221 K / (20.18 × 10^-3 kg/mol)]^(1/2)v(rms) = [4.981 × 10^-20 m^2/s^2]^(1/2) = 2.233 × 10⁻⁴ m/s.

Therefore, the RMS average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C is 2.233 × 10⁻⁴ m/s (rounded off to 3 significant digits).

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The constant current is 0.0406 A for the  nickel anode in an electrolytic cell decreases in mass by 1.20 g in 35.5 min. the oxidation half-reaction converts nickel atoms to nickel(ii) ions.

In an electrolytic cell, the oxidation half-reaction converts nickel atoms to nickel (II) ions, and the nickel anode in an electrolytic cell decreases in mass by 1.20 g in 35.5 min.

To determine the constant current, we can use Faraday's laws. Faraday's laws were established by Michael Faraday, a British scientist, in the early 19th century. His laws explain how much mass will be lost or gained at an electrode during electrolysis and how much electrical energy is required. Faraday's first law states that the mass of a substance deposited during electrolysis is proportional to the number of electrons that pass through the electrolyte.

The following formula can be used to calculate the constant current:

I = (nF / t) × (m / M)

where, I = Constant Current (in amperes), n = number of moles of electrons transferred, F = Faraday constant (96500 C/mol), t = Time taken, m = mass of substance (in grams), M = Molar mass of the substance (in grams/mol)

The Faraday constant is the amount of charge that must pass through an electrode to deposit or liberate 1 mole of any substance. For nickel, the molar mass is 58.69 g/mol, and the oxidation state is +2, which means that two electrons are lost per nickel atom. Thus, n = 2.

To calculate the current, we must first find the number of moles of nickel atoms lost during electrolysis. The formula for the number of moles is:

n = m / M

n = 1.20 g / 58.69 g/mol

n = 0.0204 mol.

Now we can use the formula above to calculate the current:

I = (nF / t) × (m / M)

I = (2 × 96500 C/mol / 2130 seconds) × (1.20 g / 58.69 g/mol)

I = 0.0406 A

I = 40.6 mA or 0.0406 A.

Therefore, the constant current is 40.6 mA or 0.0406 A.

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Al(NO3)3 solution concentration and the concentration of H3O+ ions in the solution following the addition of HNO3 are given in the problem. We can determine the presence of [Al(H2O)5(OH)2+] in the solution using this knowledge along with the known equilibria for the hydrolysis of Al3+.

For Al3+, the hydrolysis process may be expressed as follows:

Al(H2O)63+ + water becomes Al(H2O)5(OH)2+ + H3O+.

The reaction's equilibrium constant expression is as follows:

Al(H2O)5(OH)2+) = K

Al(H2O)63+ / [H3O+]

We must take into account the dissociation of Al(NO3)3 in water in order to determine [Al(H2O)5(OH)2+] in a 0.15 M solution of Al(NO3)3:

Al3+ (aq) + 3NO3- Al(NO3)3 (s) (aq)

Al3+ has a concentration of 0.45 M (3 times that of the Al(NO3)3 solution) in an Al(NO3)3 solution with a concentration of 0.15 M. H3O+ is present in the solution at a concentration of 0.10 M.

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The equilibrium shift when the concentration of H2 (gas) is increased by adding more hydrogen gas to the container at constant temperature is towards the right side of the reaction equation.

Let us understand how the reaction shifts with the help of the following chemical reaction equation. N2(g) + 3H2(g) ⇌ 2NH3(g).

Adding more H2 gas to the container at constant temperature will increase the concentration of H2 gas.

The reaction will shift towards the product side (right side of the reaction equation) to balance the reaction equation.

The concentration of NH3 gas will increase, and the concentration of N2 gas and H2 gas will decrease.

The reaction quotient (Qc) is used to predict the direction of the reaction.

If Qc is greater than Kc, the reaction shifts towards the left side of the reaction equation.

If Qc is less than Kc, the reaction shifts towards the right side of the reaction equation.

.f Qc is equal to Kc, the reaction is at equilibrium state with no shift in the reaction.

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There are 4 chirality centers in an aldohexose. The correct answer is option b.

Aldohexoses are six-carbon monosaccharides with a carbonyl functional group (aldehyde group) and five other carbon atoms, each of which is associated with an alcohol functional group in their straight-chain form. The carbonyl carbon, which is referred to as the anomeric carbon, determines the stereochemistry and the cyclic form of aldohexoses.

Chirality centers are carbon atoms that have four distinct substituents bonded to them, resulting in the ability to exist as stereoisomers. These stereoisomers are mirror images of each other and cannot be superimposed upon each other.Therefore, it is important to count the number of chirality centers present in the aldohexose structure.

There are four chirality centers in aldohexose, which are present at carbon atoms 2, 3, 4, and 5.

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The pH of a solution prepared from 0.201 mol/L of NH4CN and enough water to make 1.00 L of solution is 4.24.

To calculate the pH of this solution, you first need to calculate the concentration of H+ ions in the solution. You can do this by using the following equation:

H+ (mol/L) = [NH4CN]2 x 10-10

Using the given information, the concentration of H+ ions in the solution is:

H+ (mol/L) = [0.201 mol/L]2 x 10-10 = 4.04 x 10-5 mol/L

You can then calculate the pH of the solution using the following equation:

pH = -log10(H+)

Using the concentration of H+ ions, the pH of the solution is:

pH = -log10(4.04 x 10-5) = 4.24

Therefore, the pH of a solution prepared from 0.201 mol/L of NH4CN and enough water to make 1.00 L of solution is 4.24.

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Answer:

Diborane, B2H6, is a useful reagent in organic chemistry. One of the several ways it can be prepared is by the following reaction 2 NaBH4(aq) H2SO4(aq) 2 H2 (g) + Na2SO4(aq) + B2H6(g) What volume of 0.0915 M H2SO4, in milliliters, should be used to consume completely 1.35 g of NaBH4? mL 200 What mass of B2H6 can be obtained? 0.51

Explanation:

hope its help

According to the given options, option "II only" will increase the pH of an H2CO3/HCO+3 buffer solution.

Buffer solution- A buffer solution is a solution that resists changes in pH when small amounts of an acid or a base are added to it.

H2CO3/HCO+3 buffer- A buffer that consists of a weak acid and its conjugate base is known as an acid-buffer or a weak acid-buffer. For example, carbonic acid (H2CO3) and bicarbonate (HCO3−) are combined in a buffer solution that has a weak acid (H2CO3) and its conjugate base (HCO3−). Carbonic acid (H2CO3) and bicarbonate (HCO3−) are combined in a buffer solution that has a weak acid (H2CO3) and its conjugate base (HCO3−).

The chemical equation for the carbonic acid-bicarbonate buffer is:

H2CO3 ⇌ H+ + HCO3−

This reaction shows that the buffer solution contains both carbonic acid (H2CO3) and bicarbonate (HCO3−) ions. H+ and HCO3− ions are formed when carbonic acid (H2CO3) dissociates in water (H2O).

Increasing the pH of a buffer solution- The pH of a buffer solution can be increased by adding a strong base, which would react with the buffer's weak acid to form its conjugate base. In this scenario, sodium bicarbonate (NaHCO3) is a strong base.

Therefore, option "II only" is the correct answer.

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The percent error of your experimentally determined density is that is an error of 2.53%.

It can be calculated using the following equation:  Error % = (Experimentally Determined Value - Known Value)/Known Value x 100. So in your case, the equation would look like: Error % = (2.03 g/l - 1.98 g/l)/1.98 g/l x 100

This gives us an error of 2.53%.
The given value of density of CO2 is 2.03 g/L and the actual value of density of CO2 is 1.98 g/L. The percent error can be calculated using the below formula: Percent error = (|experimental value - actual value|/actual value) × 100Therefore, the percent error of experimentally determined density is Percent error = (|2.03 g/L - 1.98 g/L|/1.98 g/L) × 100= (0.05 g/L/1.98 g/L) × 100= 2.53%Thus, the percent error of the experimentally determined density is 2.53%.

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The reaction of hydrogen gas and oxygen gas to produce water is an exothermic reaction because more energy is released in the formation of the products than is needed to break the bonds of the reactants.

In other words, more energy is released when the hydrogen and oxygen molecules combine to form water molecules than is needed to break the bonds between the hydrogen and oxygen molecules.

Exothermic reaction- It is a type of reaction in which the two atoms react with each other to form a stable compound and release energy in the process of doing so.

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Ion channels that open and close in response to a change in membrane potential are called voltage-gated ion channels.

Voltage-gated ion channels are a specialized type of membrane protein that are embedded in the lipid bilayer of excitable cells. They have a pore that allows ions to flow through, and they can be selective for different types of ions, such as sodium (Na+), potassium (K+), or calcium (Ca2+).

The opening and closing of the channel's pore is controlled by changes in the membrane potential, which is the difference in electrical charge across the cell membrane.

These channels are crucial for the generation and propagation of electrical signals in excitable cells, such as neurons and muscle cells. Voltage-gated ion channels are capable of detecting small changes in membrane potential and responding by opening or closing their pore, allowing ions to flow across the membrane and alter the electrical state of the cell.

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The net ionic equation for the reaction between [tex]Ba(OH)_2(aq) and H_2SO_^4 (aq)  is :2Ba^2^+(aq) + SO_4^2^-(aq) + 2H^+(aq) ⇒ 2Ba^2^+(aq) + 2H_2O[/tex]

When the following two solutions are mixed:

[tex]K_2CO_3(aq) + Fe(NO_3)_3(aq)[/tex], the mixture contains the following ions:

[tex]NO_3- (aq), Fe^3+, CO_3^ 2-, K^+[/tex]. The spectator ions are NO3- (aq) and K+, and the ions that react are Fe3+ and CO3 2-.

Hence , The correct net ionic equation, including all coefficients, charges, and phases, for the reactants [tex]Ba(OH)_2(aq) + H_2SO_4(aq) [/tex] is 2Ba^2^+(aq) + SO_4^2^-(aq) + 2H^+(aq) ⇒ 2Ba^2^+(aq) + 2H_2O[/tex] .
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The ionic salt that contains a CO₄ ion would produce a neutral solution. Hence, option C is correct.

Salts are ionic compounds that completely disintegrate into ions when they are dissolved in water. They are created when acids and bases react, and they are always made up of either metal cations or cations made from ammonium (NH₄⁺).

The pH of a salt depends on the basicity or acidity of its anion and cation. The salt of a strong acid and a strong base creates a neutral solution because it does not create any H+ or OH-. Likewise, if the salt comes from a weak acid and a strong base, the resulting solution will be basic because the conjugate base of a weak acid is a strong base.

Therefore, the given ionic salt with a CO₄ ion is neutral.

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When a scientist carefully examines any quantities repeatedly, they actually expect that all but one measurement will be the same. The correct option is C.

Measurement error is the difference between the value obtained by the observer and the true value of the quantity being measured. When scientists take measurements, they try to reduce errors as much as possible so that they can have a more precise value. Measurement error is divided into two categories: systematic errors and random errors.

In any situation, scientists and researchers want to ensure that their measurements are as accurate as possible. As a result, when taking measurements, they will repeat the measurements multiple times to obtain the most precise data possible. In such a situation, a scientist will expect that all but one measurement will be the same. They will then take the average of the multiple measurements taken, which is more accurate than taking a single measurement. This technique reduces the likelihood of systematic errors, which can arise due to environmental factors, instrument errors, or personal errors.

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You need to know the hydronium ion concentration in moles per litre to determine the pH of the an aqueous solution (molarity). The equation pH Equals - log [H3O+] is then used to determine the pH.

An universal indicator is indeed a pH indicator made of the a solution of many compounds which exhibits several continuous colour changes more than a wide range pH levels to indicate the alkaline or acidic nature of solutions.

There are two ways to measure pH: colorimetrically with indicator fluids or sheets and electrochemically with electrodes as well as a millivoltmeter for greater accuracy (pH meter).

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In each of the following situations, the intensity of the interaction differs for charged particles.

a. The distance between the charges increases. (decreases)

b. The size of the charge decreases. (increases)

a. The strength of the interaction between charged particles decreases as the distance between them increases. This is because the force between charged particles follows an inverse square law, which means that the force decreases with the square of the distance between the charges. Therefore, as the distance between the charges increases, the force between them decreases and the strength of the interaction decreases.

b. The strength of the interaction between charged particles increases as the size of the charge decreases. This is because the force between charged particles is directly proportional to the magnitude of the charge. Therefore, as the size of the charge decreases the force between the charged particles decreases and the strength of the interaction decreases.

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Answer:

   Fatty acids

   Steroids

   Glycolipids

   Triacylglycerols

   Sphingolipids

   Phospholipids

D. Running water at 135 F (57 C) or lower, or a container of water at 135 F (57 C) or lower.