Why are molecular covalent compounds insoluble in water?

Answer:

-a covalent bond.

Explanation:

Answer:

seven on the ph scale is the neutral point

Explanation:

The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

There are 8 photons will be involved in the transfer of 4 electrons from psii to 2 nadp.

The photon of light energy moves till it encounters a chlorophyll molecule. An electron inside the chlorophyll is "activated" by the photon. The electron is provided energy, which enables it to separate from a chlorophyll molecule atom. Therefore, it must be claimed that chlorophyll "donates" an electron.

NADP+, the last electron receiver for linear photosynthesis, needs two electrons to become NADPH. There are 2 NADPH created for every 8 photons (4 to PS-I & PS-II each).

Therefore, there are 8 photons will be involved in the transfer of 4 electrons from psii to 2 nadp.

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The missing variable of (⁻¹) is bromine.

Let the missing variable be X.

No. of electrons in the monoatomic anion (X⁻¹ )= 36

No. of electrons in the monoatomic atom (X) = 35

Atomic No. = No. of protons = No. of electrons in neutral atom = 35

Mass No. = No. of protons + No. of neutrons

               = 35 + 45 = 80

Hence, the element must be Br as its mass no is 80 and atomic no is 35.

And the ion is bromide ion or Br⁻¹ ion. It is an anion which gains an electron to achieve octet.

X → Br and X⁻¹ → Br⁻¹

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When the pressure and temperature of a gas are held constant, the ideal gas law can be simplified to give Avogadro's law, expressed as V/N = k, where V is the volume of the gas, N is the number of moles of gas, and k is a constant.

Avogadro's law states that at a given temperature and pressure, the volume of a gas is directly proportional to the number of moles of gas.

When the pressure and temperature of a gas are held constant, the ideal gas law can be simplified to PV = nRT. Rearranging this equation gives V/n = RT/P. Since RT/P is a constant at constant temperature and pressure, this equation can be expressed as V/N = k, where k is the constant. This equation is known as Avogadro's law, which states that the volume of a gas is directly proportional to the number of moles of gas, at constant temperature and pressure.

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Answer:

P₂ = 0.13880 atm

Explanation:

Given info are;

Initial volume = 13.0 L

Initial pressure = 3.15 atm

Initial temperature = 213.0 K

Final temperature = 398.0 K

Final volume = 35.0 L

Final pressure = ?

Note;

Base on general gas equation:

P₁V₁/T₁ = P₂V₂/T₂

Formula = P₁V₁/T₁ = P₂V₂/T₂  

Solution:

P₂ = P₁V₁ T₂/ T₁ V₂

P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L  

P₂ = 1034.8 atm .L.K/ 7455 K.L

P₂ = 0.13880617035

P₂ = 0.13880 atm  

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

Thus we will include five significant figures in answer because 1034.8 have five significant figure.

[RevyBreeze]

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of gas is 0.13880 atm .

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

P₂ = P₁V₁ T₂/ T₁ V₂

P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L  

P₂ = 1034.8 atm .L.K/ 7455 K.L

P₂ = 0.13880617035

P₂ = 0.13880 atm  

Therefore the new pressure of  gas is 0.13880 atm  when the temperature is changed to 398.0 K  and volume is increased to 35.0 liters.

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Answer: 15910 meters

Explanation:

1 kilometer = 1000 meters

15.91 kilometers * 1000 meters/1 kilometer =

15.91 * 1000/1=

15.91*1000=15910 meters

Answer : The ranking of the given compounds in increasing order of acidity are as follows:CH4 < H2O < H2S < H2Se.

Methane is a neutral compound and thus has no acidic properties, and thus the lowest acidity among all. Water is a weakly acidic compound because it is capable of donating one hydrogen ion (H+) and has a pKa value of 15.7. H2S is a stronger acid than water due to its lower pKa value (7.0) and greater tendency to donate H+.

Lastly, H2Se is the most acidic among all the given compounds because it has the lowest pKa value of all, 3.9. The acidity of a compound is dependent on its tendency to donate H+ and the stability of the conjugate base formed. The smaller the pKa value, the more acidic the compound is.

H2Se is the most acidic compound, with a pKa of 3.9. It's because of the greater tendency to donate its protons. Its conjugate base is also highly stable due to the availability of additional electrons in the Se atom. In addition, you can also explain the effect of electronegativity on the acidity of these compounds. Electronegativity is an atom's ability to attract electrons towards itself.

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The original concentration of the sodium oxalate was 0.0675 M.

The balanced equation for the reaction between potassium permanganate (KMnO₄) and sodium oxalate (Na₂C₂O₄) is:

5 C₂O₄²⁻ + 2 MnO₄⁻ + 16 H⁺ → 2 Mn²⁺ + 10 CO₂ + 8 H₂O

From the balanced equation, we can see that 5 moles of sodium oxalate react with 2 moles of potassium permanganate. Therefore, the number of moles of potassium permanganate used in the titration is:

n(KMnO₄) = M(KMnO₄) x V(KMnO₄) = 0.1500 M x 22.30 mL x (1 L/1000 mL) = 0.003345 moles

Using the stoichiometry of the balanced equation, we can determine the number of moles of sodium oxalate that reacted:

n(Na₂C₂O₄) = (5/2) x n(KMnO₄) = (5/2) x 0.003345 moles = 0.008362 moles

Finally, we can calculate the concentration of the original sodium oxalate solution:

M(Na₂C₂O₄) = n(Na₂C₂O₄) / V(Na₂C₂O₄) = 0.008362 moles / 10.00 mL x (1 L/1000 mL) = 0.0675 M

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The predominant form of CH3CH2NH3 at pH = 14 will be the ionized form.

This is because at high pH, the solution is basic, and there are excess hydroxide ions. The hydroxide ions remove a proton from the ammonium ion, forming ammonia and water. The chemical equation for this reaction is as follows:CH3CH2NH3+ OH- → CH3CH2NH2 + H2O

The predominant form of CH3CH2NH3 at pH = 14 is CH3CH2NH2. This is the ionized form of the compound, which has lost a proton to become an amine. The structure of the predominant form of CH3CH2NH3 at pH = 14 is shown below:CH3CH2NH2

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Answer:

meter

have a nice holiday

Answer:

The Meter

Explanation:

In the metric system, the meter is the standard measurement of length.

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Answer:

A) In aldehydes, the carbon is always joined to at least one hydrogen atom.

Explanation:

Aldehydes and Ketones are organic compounds.

The main difference between them is that aldehydes have the carbon atom attached to at least one hydrogen atom.

In ketones, the carbon is attached to another carbon.

To reiterate, the striking difference between the two families is that in alkanals, a hydrogen atom is directly attached to the carbonyl group while in alkanones, no hydrogen atoms is attached to the carbonyl group but two bulky alkyl groups.

Atoms that are unable to pass one another become free to migrate during state shifts such as sublimation and melting. While atoms also have a tendency to clash when a solid material melts.

This allows them to slip past one another. As a result, we may say that as an object melts or sublimation, its state changes, allowing atoms that can't travel past one another to do so. A substance can transfer directly from the solid to the gas state through sublimation, bypassing the liquid step. A substance can change its phase from a solid to a liquid by the physical process of melting or fusion. When the solid's internal energy increases, usually as a result of the application of heat causes melting.

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The formula of the compound vanadium (V) oxide is V2O5.

Ionic compound is formed by transfer of electrons from metal to non metal. For formation of a neutral ionic compound, the charges on cation and anion must be balanced. Ionic compounds are compounds with ionic bonds, given by the exchange of electrons between a cation (positive ion) and an anion (negative ion)The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  Here vanadium is having an oxidation state of +5 and oxide is a ion with oxidation state of -2. Thus on exchange of their oxidation states, they combine to form neutral V2O5.

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The exact number of acetylcholine (ACh) molecules required to completely activate the cholinergic nicotinic receptor depends on several factors, including the receptor density, affinity of the receptor for ACh, and the efficiency of the receptor activation process.

 Cholinergic nicotinic receptors are ligand-gated ion channels found in the nervous system that respond to the neurotransmitter acetylcholine (ACh). The activation of these receptors occurs when ACh molecules bind to specific binding sites on the receptor.

  The exact number of ACh molecules required for full receptor activation can vary and is influenced by multiple factors. One crucial factor is the receptor density, which refers to the number of receptors present on the cell surface. Higher receptor density would require more ACh molecules to engage and activate a larger number of receptors.

  Additionally, the affinity of the receptor for ACh plays a role. Affinity refers to the strength of the binding interaction between ACh and the receptor. Receptors with higher affinity for ACh will require fewer ACh molecules to achieve activation compared to receptors with lower affinity.

  Furthermore, the process of receptor activation can be cooperative, meaning that the binding of one ACh molecule can facilitate the binding of additional ACh molecules to nearby receptor sites. Cooperative binding can increase the overall efficiency of receptor activation and reduce the number of ACh molecules required for full activation.

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Answer:

The correct answers are

Particles are dissolved

and light beam passes through invisibility

Explanation:

Odyssey

The percent composition of Ca in the compound is 42.06%.

The percent composition of Ca in the compound can be calculated using the formula:

% Ca = (mass of Ca/mass of compound) x 100

Given that 17.6 grams of Ca combine completely with 24.2 grams of S to form a compound, we can calculate the mass of the compound as:

mass of compound = mass of Ca + mass of S = 17.6 + 24.2 = 41.8 g

Substituting these values in the formula above, we get:

% Ca = (17.6 / 41.8) x 100 = 42.06%

Therefore, the percent composition of Ca in the compound is 42.06%.

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The statement that best describes these observations is : ( C )

The mixture of a sample of C₂H₅OH and water is a solvation process ( interaction between solute and solvent ) which is a physical change and the level of solvation depends on the solvent ( water ) polarity.

The container been warm after the mixture sows that some heat is expensed into the surrounding ( exothermic reaction ). therefore we can conclude that a physical change has occurred and the solvation process is exothermic.

Hence we can conclude that the statement that best  describes these observations is : A physical change occurs and the solvation process is exothermic.

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Answer:

Your Answer would be Option B

Answer:

B

Explanation:

The Answer is B-Transfer of heat through direct physical contact

Explanation:

option A skeleton system is correct option

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The final temperature inside the scuba tank after its pressure goes from 130.0atm to 75.0 atm is -40.5 °C

From the question given above, the following data were obtained obtained:

The final temperature inside the scuba tank can be obtain as follow:

P₁ / T₁ = P₂ / T₂

130 / 403 = 75 / T₂

Cross multiply

130 × T₂ = 403 × 75

Divide both side by 130

T₂ = (403 × 75) / 130

T₂ = 232.5 K

Subtract 273 to obtain answer in °C

T₂ = 232.5 – 273 K

T₂ = -40.5 °C

Thus, the final temperature is -40.5 °C

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Answer:

a

Explanation:

The change in enthalpy when 52.0 g of solid chromium is oxidized is -567.5 kJ.

To calculate the change in enthalpy (ΔH) when 52.0 g of solid chromium (Cr) is oxidized to form chromium(III) oxide (Cr2O3), we need to use the stoichiometry of the balanced chemical equation and the molar enthalpy of formation (ΔH°f) for Cr2O3.

The balanced equation for the reaction is: 4Cr(s) + 3O2(g) → 2Cr2O3(s)

First, we need to calculate the number of moles of Cr:

Molar mass of Cr = 52.0 g/mol

Number of moles of Cr = mass / molar mass = 52.0 g / (52.0 g/mol) = 1.0 mol

According to the balanced equation, the stoichiometric ratio between Cr and Cr2O3 is 4:2, so 1.0 mol of Cr will produce 0.5 mol of Cr2O3.

Next, we can calculate the change in enthalpy using the molar enthalpy of formation for Cr2O3:

ΔH = ΔH°f × moles of Cr2O3

ΔH = (-1135 kJ/mol) × (0.5 mol)

ΔH = -567.5 kJ

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Answer:

4) the one that is reduced, which is the oxidizing agent

Explanation:

An oxidizing agent is one that causes oxidation by gaining electrons from another atom/molecule.

Answer:

c

Explanation:

Answer

bitly coin download

Explanation:

bitly coin download

Region Z should be monitored more closely to avoid health issues.

Region Z should be monitored more closely to avoid potential health issues because region Z produces waste from chemical plants which are dangerous for our water and environment so we can conclude that Region Z should be monitored more closely in order to avoid health issues.

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The finding that is commonly associated with atopic dermatitis (AD) diagnosed in children is an itchy, red rash that can appear on various parts of the body.

Atopic dermatitis, also known as eczema, is a chronic skin condition that commonly affects children and can persist into adulthood. The most prominent finding of AD is a red, itchy rash that can appear on the face, neck, scalp, arms, legs, and other areas of the body. The rash may be dry, scaly, and have a rough texture, and it can become infected if scratched too much. Other symptoms of AD include skin inflammation, swelling, and oozing or crusting.

Atopic dermatitis is a type of allergic reaction that can be triggered by a variety of factors such as environmental allergens, irritants, stress, and genetics. The condition is commonly diagnosed in infants and young children, with about 10% to 20% of children worldwide experiencing symptoms of AD. While the exact cause of AD is not fully understood, it is believed that a combination of genetic and environmental factors play a role in the development of the condition. Treatment for AD typically involves avoiding triggers, applying topical medications such as corticosteroids, and managing symptoms with moisturizers and other soothing agents.

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Answer:

Law of superposition

4 million

Explanation:

Answer:

the law of superposition and 4 million

Explanation:

Answer:

Oganesson is the number 118 the largest

Answer:The pOH of the solution is 9.914

Explanation:

pH is given as the negative logarithm (base 10) of the hydronium ion concentration [H₃O⁺] that is

pH= - log [H₃O⁺]

Since we are given  [H₃O⁺]=8.2 x 10⁻⁵,

pH=- log (8.2 x 10⁻⁵)

pH= 4.086

The pOH gives s the measurement of the concentration of OH− ions, Hence,

pH + pOH= 14

from the above calculation, we got  pH=4.086

So

4.086 + pOH=14

pOH= 14 - 4.086

pOH= 9.914

The pOH of the solution is 9.914