consider a saturated solution of lead sulfide, pbs, in water. pbs(s) ⇌ pb2 (aq) s2-(aq) what is the effect of adding pbs(s) to the solution?
a. More s2- vwill form but the concentration of Pb2 will remain constant. b. the PbS(s) has no effect on the system c. More Pb2*and s2 will form. d. More Pb2+ will form but the concentration of s2 will remain constant.

The pH of the aqueous solution that is the mixture of 0.10 M NaNO₂ and 0.20 M Ca(NO₂)₂ is 2.52.

To calculate the pH of the given aqueous solution, we need to first determine the concentration of HNO₂ in the solution. HNO₂ is a weak acid, and its Ka value is given as 4.5 x 10⁻⁴. We can write the dissociation reaction of HNO₂ as:

HNO₂ + H₂O ⇌ H₃O⁺ + NO₂⁻

The equilibrium constant expression for this reaction can be written as:

Ka = [H₃O⁺][NO₂⁻] / [HNO₂]

Assuming that the initial concentration of HNO₂ is negligible compared to the equilibrium concentration, we can simplify the expression as:

Ka = [H₃O⁺]² / [HNO₂]

Solving for [H₃O⁺], we get:

[H₃O⁺] = √(Ka * [HNO₂]) = √(4.5 *10⁻⁴ * 0.10) = 0.015

Now, we can use the concentration of Ca(NO₂)₂ to calculate the concentration of NO₂⁻ in the solution. Ca(NO₂)₂ dissociates into Ca²⁺ and 2NO₂⁻. Since NO₂⁻ is the conjugate base of HNO₂, it can react with H₃O⁺ to form HNO₂ and H₂O. This reaction can be written as:

NO₂⁻ + H₃O⁺ ⇌ HNO₂ + H₂O

The equilibrium constant expression for this reaction can be written as:

Kb = [HNO₂][H₂O] / [NO₂⁻][H₃O⁺]

Since Kb for NO₂⁻ is related to Ka for HNO₂ as:

Ka x Kb = Kw = 1.0 * 10⁻¹⁴

We can use this relation to calculate Kb for NO₂⁻ as:

Kb = Kw / Ka = 1.0 x 10⁻¹⁴ / 4.5 x 10⁻⁴ = 2.22 x 10⁻¹¹

Assuming that the initial concentration of NO₂⁻ is negligible compared to the equilibrium concentration, we can simplify the expression for Kb as:

Kb = [HNO₂][H₂O] / [NO₂⁻]

Solving for [HNO₂], we get:

[HNO₂] = Kb * [NO₂⁻] / [H₂O] = 2.22 * 10⁻¹¹ * (2 * 0.20) / 55.5 = 1.59 * 10⁻¹²

Now, we can use the concentrations of HNO₂ and NO₂⁻ to calculate the pH of the solution using the equation:

pH = -log[H₃O⁺] = -log(√(Ka x [HNO₂] / [NO₂⁻])) = -log(√(4.5 x 10⁻⁴ x 0.10 / (2 x 0.20))) = 2.52

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1. We can see here that critical mass is important for a fission chain reaction because: C. It allow neutrons to be absorbed by other fissionable nuclei.

Fission chain reaction is a self-sustaining reaction in which the splitting of atomic nuclei of a particular material, such as uranium or plutonium, releases a large amount of energy in the form of heat and radiation.

2. A moderator is important for a fission chain reaction because: A. it keeps the neutrons from escaping the sample.

3. Enrichment is important for a fission chain reaction because: D.  it provides enough fuel to make enough energy.

A moderator is important for a fission chain reaction because it slows down the fast-moving neutrons, making them more likely to be absorbed by other fissionable nuclei and sustain the chain reaction. Without a moderator, the neutrons would move too quickly to be efficiently absorbed.

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The equilibrium membrane potential (E) is the weighted average of EK and ECl, based on the permeability of the channels. Since we are not given the relative permeabilities, we cannot calculate the exact value. However, the equilibrium potential for this neuron is expected to be closer to EK, as the concentration difference for potassium is larger than that of chloride. Therefore, the closest option is:  d. 10.9 mV

To calculate the equilibrium membrane potential for this neuron, we can use the Nernst equation. The Nernst equation relates the concentration gradient of ions to the membrane potential.

The Nernst equation is given by:

E = (RT/zF) * ln(Co/Ci)

Where:

E is the equilibrium membrane potential

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin (assume body temperature of 37°C = 310 K)

z is the valence (ion charge)

F is Faraday's constant (96,485 C/mol)

Co is the extracellular ion concentration

Ci is the intracellular ion concentration

For potassium (K+), the valence (z) is +1. The extracellular concentration (Co) is 5.00 mM, and the intracellular concentration (Ci) is 140 mM.

For chlorine (Cl-), the valence (z) is -1. The extracellular concentration (Co) is 110 mM, and the intracellular concentration (Ci) is 4.00 mM.

Plugging in these values into the Nernst equation:

EK = (8.314 * 310)/(1 * 96,485) * ln(5.00/140)

ECl = (8.314 * 310)/(-1 * 96,485) * ln(110/4.00)

Calculating the values:

EK = -0.080 V

ECl = -0.057 V

The equilibrium membrane potential (E) is the weighted average of EK and ECl, based on the permeability of the channels. Since we are not given the relative permeabilities, we cannot calculate the exact value. However, the equilibrium potential for this neuron is expected to be closer to EK, as the concentration difference for potassium is larger than that of chloride. Therefore, the closest option is:  d. 10.9 mV

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Answer:

C. 1 cubic foot of loose sand

Explanation:

For many  objects having equal volume , surface area will be maximum

of the object which has spherical shape .

But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .

Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .

Answer:

the answer would be C 1 cubic foot of loose sand.

Answer:

c i think

Explanation:

Answer:

Both the Earth and Venus show the appearance of igneous rocks due to the cooling of the magma.

Explanation:

As we know, ignea rock is the first step in the transformation of rocks. This rock is formed by the overflow of terrestrial magma which, upon cooling, turns into ignea rock, which will undergo metamorphism and transform into metamorphic rock, which will continue to undergo metamorphosis until it becomes the other rocks that complete the rock cycle. This is a terrestrial process that can be found on Venus, which also presents the cooling of magma in the formation of ignea rock, which will undergo metamorphism, transforming into other rocks, the way it occurs on Earth.

the correct answer is thermal or light

Answer:

ruby

Explanation:

Answer:C

Explanation:I got it correct not no genius though.

Answer:

Henry moseley organised the periodic table according to the protons in the nuclei of atoms which he called their atomic numbers

a) Mentruastion in Sciencetific Terms.

Periods in Everyday Language.

b) Well, yea Sad. It's an Awful Period in Life, I mean, There are Certain Restriction That Needs to be Followed during that time. it's not easy..

c) "Sexual Maturity" in Human Female Body.

d) During Pregnancy it stops Temporarily and Continues after That.

e) Menopause is the name Given For the Event to stop Permanently. usually at the age of 40-45.

_______________________________

This Particular Event is Common in all Females, we undergo this Stage at 10-12.

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Answer:

Hii dear.....wnt be my frnd???

Answer:

Outside or External

Explanation:

Take for example, an Exothermic reaction. This just means that the reaction releases heat to the outside.

Answer:

It means out of, away from, outer, external, outside, or exterior.

Explanation:

Hope this helps!

Brainliest if correct pls

Answer:

because in bellon when we pump he throw carbon dioxide not hydrogen

Answer:

Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium.

Explanation:

Hydrogen is not used in balloons and this demonstration shows why. ... This is because hydrogen burns very easily.

Answer:

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Answer:

Formaldehyde(CH\(_{2}\)O) or methanal is your answer.

Answer:

g/cm³ for solids,

g/ml for liquids

g/L for gases.

Explanation:

Though SI unit of density is kg/m³, for convenience we use g/cm³ for solids, g/ml for liquids and g/L for gases. Mathematically, density is defined as mass divided by volume:   ρ=m/V    

​

The quantity (moles) of naoh must be added to 1.0 l of 2.0 m hc2h3o2 to produce a solution buffered at each pH is determined by the calculations given below.

To determine the quantity (moles) of NaOH that must be added to 1.0 L of 2.0 M HC2H3O2 to produce a solution buffered at each pH, we can use the Henderson-Hasselbalch equation. Here are the steps to follow:

1. Write down the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA])

2. Determine the pKa of HC2H3O2 (acetic acid). Acetic acid has a pKa value of 4.74.

3. Plug in the desired pH value and the pKa value into the equation:
  pH = 4.74 + log([A-]/[HA])

4. Solve for the ratio [A-]/[HA] using the given pH value:
  [A-]/[HA] = 10^(pH - 4.74)

5. Calculate the initial moles of acetic acid (HA) in the solution:
  Moles of HA = 2.0 M * 1.0 L = 2.0 moles

6. Calculate the moles of A- (acetate) and NaOH required:
  Moles of A- = ([A-]/[HA]) * moles of HA
  Moles of NaOH = moles of A- (since NaOH reacts with acetic acid in a 1:1 ratio)

By following these steps, you can determine the quantity (moles) of NaOH needed to be added to 1.0 L of 2.0 M HC2H3O2 to produce a solution buffered at a specific pH value.

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    This is not exactly a answer you can use but this is some information that you can use to find out the answer.

    You can usually confirm the charge associate degree particle unremarkably has by the element's position on the periodic table: The alkali metals (the IA elements) lose one negatron to create a ion with a 1+ charge. The alkaline-earth metal metals (IIA elements) lose 2 electrons to create a 2+ ion.

    Nonmetals type negative ions (anions). A range 7|chemical element|element|gas} atom should gain 3 electrons to possess an equivalent number of electrons as AN atom of the subsequent gas, neon. Thus, a gas atom can type AN ion with 3 additional electrons than protons and a charge of 3−.

Answer:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

yw <3

Answer:

energy cannot be created or destroyed. it is instead transferred from one form to another

Explanation:

The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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The answer is  longitudinal waves

Answer: the answer is D the last one.

Explanation:

hope this helps! have a good day! :) ^-^

Answer:

contain equal numbers of particles. ... MELTING POINT is the temperature at which a solid turns into liquid. ... Determine the energy required (in Joules) when the temperature of 3.21 grams of water increases by 4.0 °C ... Solve for at mater RW 100. ... How much heat energy is released when 12.8 g of barium oxide react with

Explanation:

If the solution is not overly basic, the concentration of hydronium and hydroxide ions in the apple juice is 2.24 x 10⁻¹¹ M.

The pH of a solution is a measure of its acidity or basicity. A pH of 3.33 indicates that the solution is acidic. To determine the concentration of hydronium (H₃O⁺) and hydroxide (OH⁻) ions in the apple juice, we can use the following equation:

pH + pOH = 14

where pOH is the negative logarithm of the hydroxide ion concentration [OH⁻]. At room temperature, we assume that the concentration of [H₃O⁺] is equal to [OH⁻] because the solution is not highly basic.

Therefore, we can rearrange the above equation to find the concentration of H₃O⁺ as follows:

pOH = 14 - pH = 14 - 3.33 = 10.67

[OH⁻] = 10^(-pOH) = 10⁻¹⁰⁶⁷= 2.24 x 10⁻¹¹ M

[H₃O⁺] = [OH⁻] = 2.24 x 10⁻¹¹ M

Thus, the concentration of hydronium and hydroxide ions in the apple juice is 2.24 x 10⁻¹¹ M, assuming the solution is not highly basic.

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As of right now, you are aware of the volumes of the base's molarity, the diluted vinegar's volume, and the titrant's volume, the molarity of acetic acid in the diluted vinegar is 0.05 M.

Calculate the moles of acetic acid in the diluted vinegar using the following formula:

Moles of acetic acid = Molarity of base * Volume of titrant

Calculate the molarity of acetic acid in the diluted vinegar using the following formula:

\(\text{Molarity of acetic acid} = \frac{\text{Moles of acetic acid}}{\text{Volume of diluted vinegar}}\)

Here is an example:

Volume of diluted vinegar = 50 mL

Molarity of base = 0.1 M

Volume of titrant = 25 mL

Moles of acetic acid = 0.1 M * 25 mL = 2.5 mmol

\(\text{Molarity of acetic acid} = \frac{2.5 \text{ mmol}}{50 \text{ mL}} = 0.05 \text{ M}\)

Therefore, the molarity of acetic acid in the diluted vinegar is 0.05 M.

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Explanation:

An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

hope it helps

Answer:

Explanation:

The molar solubility is inversely proportional to the Ksp values of the given salts. The lesser the Ksp values of the salts, the lesser their molar solubility will be. Therefore, the given salts can be ranked in the following order of increasing molar solubility: CdS > PbSO4 > BaSO4 > BaCO3 > AgCl.

The given Ksp values for the salts are:

Ksp for CdS = 8 × 10⁻²⁷

Ksp for PbSO4 = 1.8 × 10⁻⁸

Ksp for BaSO4 = 1.1 × 10⁻¹⁰

Ksp for BaCO3 = 9.1 × 10⁻⁹

Ksp for AgCl = 1.8 × 10⁻¹⁰

Therefore, the salts arranged in order of increasing molar solubility are: CdS > PbSO4 > BaSO4 > BaCO3 > AgCl.

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Answer:

2,760 grams NaCl

Explanation:

To find grams of NaCl, you need to (1) convert moles of Na to moles of NaCl (via mole-to-mole ratio from reaction) and (2) convert moles of NaCl to grams (via molar mass from periodic table). The final answer should have 3 significant figures based on the given measurement.

2 Na + Cl₂ --> 2 NaCl

Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl) = 58.44 g/mol

47.2 moles Na           2 moles NaCl              58.44 grams

----------------------  x  ---------------------------  x  -------------------------  =
                                   2 moles Na                   1 mole NaCl

= 2,758.368 grams NaCl

= 2,760 grams NaCl

Answer:

The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.

Explanation:

Answer:

The chemical or substances used to start a reaction are called reactants.

Answer:

The correct option is AlFA

Explanation:

There is no element in the periodic table with the symbol of A. Thus, the compound AlFA is wrong and cannot be a salt made from main group elements. CaO is calcium oxide, Al₂O₃ is aluminium oxide and Ca₃N₂ is calcium nitride - all are evidently made from elements from the main groups of the periodic table (except the AlFA)