Consider the equilibrium of PbCl2(s) in water PbCl2(s) ???? Pb2+(aq) + 2 Cl-(aq) What is the effect of adding NaCl(aq) to the equilibrium solution? Select one: a. PbNa2(s) precipitates b. PbCl2 solubility increases due to the common-ion effect c. PbCl2(s) precipitates until equilibrium is re-established d. The NaCl has no effect on the system e. The sodium reduces the Pb2+ to Pb(s)

Answer:

number of protons

Explanation:

The number of protons determines an element's atomic number and is used to distinguish one element from another. 

From home, you walk 6 blocks east and then walk 4 blocks west. Your distance from home is 2 blocks. So option a is correct.

When you start from home and walk 6 blocks east, you are increasing the distance from home by 6 blocks. So, your current position from home is 6 blocks east.

Then, you walk 4 blocks west. By walking west, you are reducing your distance from home. You are 4 blocks closer to home than your last position which is 6 blocks east.

So the total distance you are from home is 6 blocks east - 4 blocks west = 2 blocks.

You can think of it as walking east increases the distance from home and walking west decreases the distance from home. The final distance from home is the net result of the distance you walked east and the distance you walked west.

So, your distance from home is 2 blocks.

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The pots and other articles made from clay hardened by heat is called ceramics..

HOPE IT'S HELPFUL FOR U MATE!!!!

The  net ionic equation of the reaction is; \(Fe^{2+} (aq) + S^{2-} (aq) ---- > FeS(s)\)

When we talk about the  net ionic equation, we are talking about the equation that would show the ions that underwent a change in the reaction. These ions would differ from the spectator ions that did not undergo any change from left to write in the reaction.

In this case, we need to write to write the net reaction equation that would show the change that leads to the precipitation of the iron II sulfide as a solid from the solution.

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Answer:

Transform boundaries because they're sliding past each other.

I hope this helped!

Answer:

D.Cell wall

Explanation:

Cell wall is a distinct feature that is mainly seen in plant cells (mostly made of Cellulose) or in prokaryotic cells like bacteria.

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Norepinephrine (NE) has either an excitatory or inhibitory effect on the effector. The answer is option B.

Norepinephrine (NE), also known as noradrenaline, is a hormone and neurotransmitter that belongs to the catecholamine family. It functions as a stress hormone, mobilizing the body and brain to action. When a person is under stress or threatened, norepinephrine is released into the bloodstream, which increases heart rate, blood pressure, and breathing rate, as well as increasing glucose production, to provide the body with energy.

Norepinephrine (NE) is a neurotransmitter that works by binding to adrenergic receptors on the surface of cells in the sympathetic nervous system, which controls the "fight or flight" response. This hormone regulates various bodily functions, including heart rate, blood pressure, and respiratory rate, among others. Norepinephrine (NE) acts as either an excitatory or inhibitory effect on the effector.

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Benzoic acid is more polar than sodium benzoate. The benzoic acid molecule is more polar due to the electron withdrawing effect of the carbonyl group on the benzene ring, while sodium benzoate is nonpolar because the benzoate ion is symmetrical.

Benzoic acid has a carboxyl functional group (-COOH) that is very polar, while sodium benzoate has a carboxylate functional group (-COO-) which is less polar. The presence of the carboxyl functional group in benzoic acid allows it to form hydrogen bonds, making it more polar than sodium benzoate.

Sodium benzoate is the sodium salt of benzoic acid, and it is less polar because the negative charge on the oxygen atom is delocalized over the two oxygen atoms, reducing the overall polarity of the molecule. As a result, benzoic acid is more polar than sodium benzoate.

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Unsaturated fatty acids are the first option (A).

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The moles of hno3 are present if 0.180 molmol of ba(oh)2 was needed to neutralize the acid solution is 0.36 mole of HNO₃.

Neutralization or neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization outcomes in there being no excess of hydrogen or hydroxide ions gift inside the answer.

Calculation:-

Valance factor of HNO₃ is = 1

valance factor of Ba(OH)₂ is = 2

mole of Ba(OH)₂ is = 0.180

therefore mole oh HNO₃ neede is = 2 * 0.180

                                                         =  0.36 mole of HNO₃

Neutralisation is a chemical response wherein an acid and a base react with each different quantitatively. it's also written as Neutralisation. The acid electricity of the reactant gives the pH of the neutralised solution.

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The solubility of mercury(II) iodide (HgI₂) in pure water is determined by its Ksp value, which is 2.9 x 10⁻²⁹.

In a 3.0 M solution of NaI, assuming (HgI₄)₂₋is the only significant species, the solubility of HgI₂can be calculated using the Ksp and K values.

The solubility of HgI2 in pure water can be calculated using its solubility product constant (Ksp). The Ksp value for HgI₂ is given as 2.9 x 10⁻²⁹. Solubility product constant represents the equilibrium constant for the dissolution of a sparingly soluble salt. By solving the equilibrium expression for HgI₂, we can determine its solubility in pure water.

In a 3.0 M solution of NaI, assuming the formation of (HgI₄)₂₋ is the only significant Hg-containing species, the solubility of HgI2 can be calculated using the Ksp and K values. The K value given for(HgI₄)₂₋ - is 6.8 x 10²⁹. By setting up an equilibrium expression considering the dissociation of HgI₂ into (HgI₄)₂₋  ions, we can determine the solubility of HgI₂in the presence of the NaI solution.

These calculations involve using the principles of equilibrium and the relationship between concentrations of dissolved species and their equilibrium constants. Solubility is defined as the maximum amount of solute that can be dissolved in a given solvent under specific conditions. By applying the relevant equilibrium expressions and values, we can determine the solubility of HgI₂ in each situation.

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Answer:

Wavelength of electromagnetic wave = 4.0 × 10³

Explanation:

Given:

Wavelength of electromagnetic wave = 4000 meter

Find:

Write, Wavelength of electromagnetic wave into scientific notation

Computation:

Wavelength of electromagnetic wave = 4000 meter

Wavelength of electromagnetic wave = 4.0 × 1,000 meter

Wavelength of electromagnetic wave = 4.0 × 10³

So,

Option "B" is the correct answer to the following question.

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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The δg for the given reaction is 32.649 kJ (rounded to 3 decimal digits).

What is Gibbs energy (δg)?

Gibbs energy is a thermodynamic property used to measure the maximum amount of reversible work that can be performed by a system at constant temperature and pressure. It is denoted by the symbol G.

First, we need to convert the given temperature from 4000 K to Kelvin:

T = 4000 K

The gas constant R is given in J/(mol·K), so we need to convert the value of ΔG° from kJ to J:

ΔG° = 220 kJ = 220,000 J

Next, we need to calculate the reaction quotient (Q) using the given partial pressure of Cl^2:

Q = P(Cl^2)

Given: P(Cl^2) = 3.29 x 10^-3 atm

Now, we can substitute the values into the equation to calculate ΔG:

ΔG = ΔG° + RT ln(Q)

     = 220,000 J + (8.314 J/(mol·K)) * (4000 K) * ln(3.29 x 10^-3)

Calculating the right-hand side of the equation:

ΔG = 220,000 J + (8.314 J/(mol·K)) * (4000 K) * ln(3.29 x 10^-3)

     = 220,000 J + (8.314 J/(mol·K)) * (4000 K) * (-5.718)

Simplifying the equation:

ΔG = 220,000 J - 187,350.656 J

     = 32,649.34 J

Converting δg from J to kJ:

ΔG = 32,649.34 J / 1000

     = 32.649 kJ

Therefore, the Gibbs energy or δg for the given reaction at 4000 K and a partial pressure of 3.29 x 10^-3 atm of Cl^2 is approximately 32.649 kJ.

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An atom's radius is well under 1 nanometer, or one billionth of a meter.

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Answer:

See Explanation

Explanation:

From Gay-Lussac's law of combining volumes;

Equation of the reaction; 2H2(g)  + O2(g) -------> 2H2O(g)

Ratio of volumes;              2           :    1                :    2

Initial volumes;                  500cm^3   500cm^3       0 cm^3

Reacting volumes;          500cm^3    250cm^3      500cm^3

Final Volumes;                0 cm^3        250 cm^3     500 cm^3

We can easily see from the table that the limiting reactant is oxygen.

Hence, the mass of water formed is obtained from;

1 mole of gaseous water occupies 22400 cm^3

x moles of water occupies 500cm^3

x = 500cm^3 * 1 mole/22400 cm^3

x = 0.022 moles of water

Mass of water = 0.022 moles of water * 18 g/mol

Mass of water = 0.396 g

The atomic symbol for the element in Group 5 A (15) and the fifth period in the periodic table is antimony or Sb.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

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Answer:

2I4O9_4I +9O

Explanation:

Complex compound (

I

4

O

9

) is broken down to form

I

2

and

O

2

Answer:

Decomposition

Explanation:

Because it went from one compound to two elements.

The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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From what we know, we can confirm that the variations in colors are a mechanism intended to protect the plants from predators.

This can be observed throughout nature. Many poisonous organisms have evolved bright colors intended to be noticed. Over time, this has resulted in many predators avoiding prey with bright colors, in order to avoid the possibility of being poisoned.

Therefore, we can confirm that the variations in colors are likely a mechanism intended to protect the plants from predators.

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Answer:

Any type of movement

Explanation:

All muscles are used for any way of movement in the body.

Answer:

C9H13O3N

Explanation:

Take the atomic mass of C=12.0, H=1.0, O=16.0 and N=14.0.

We can draw a chart (please view this on desktop so to avoid spacing errors):

Let the mass of Epinephrine be 100g.

                             C                       H                          O                              N

mass(g) :              59                      7.15                    26.2                         7.65

no. of moles : 59/12 =4.9167     7.15/1 = 7.15     26.2/16=1.6375 7.65/14=0.5464

(n.o.m. = mass/molar mass)

Ratio:   4.9167/0.5464 =9    7.15/0.5464=13      1.6375= 3      0.5464/0.5464 =1

(divide the n.o.m. by the smallest n.o.m., which is 0.5464 in this case, take the whole numbers)

So, the empirical formula will be: C9H13O3N

But this is still not yet the molecular formula. We have to ensure the molar mass is 183g/mol. Multiply the empirical formula by n.

So, let the molecular formula of Epinephrine be (C9H13O3N)n.

12x9n + 1x13n + 16x3n + 14n = 183

108n + 13n + 48n + 14n = 183

183 n = 183.

n = 1

Hence, the molecular formula is C9H13O3N.

Answer:

Any material that exerts magnetic force is considered a magnet.

TRUE

The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.

The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.

Given:

m = 8.75

c = 4.186 J/g°C

The melting point and boiling point of water is 0° and 100° respectively.

Δt = 100° - 0° = 100°

We know that,

q = mcΔt

  = 8.75(4.186)100

  = 3.662 kJ

Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

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