please explain this question
this is urgent thank u

Answer:

Apply cool compresses to the skin. Use topical treatments to relieve itching, including calamine lotion, oatmeal baths, Tecnu, Zanfel, or aluminum acetate (Domeboro solution). Oral antihistamines, such as diphenhydramine (Benadryl), can also help relieve itching.

As both the ions have charge of +2 the compound formed is PbMg as the like charges will cancel out each other.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.Ions of opposite charges combine in ionic compounds.

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The maximum mass of NH₃ that can be formed when 36.52 g of N₂ reacts with 10.62 g of H₂ is 44.35 g

N₂ + 3H₂ —> 2NH₃

Molar mass of N₂ = 14 × 2 = 28 g/mol

Mass of N₂ from the balanced equation = 1 × 28 = 28 g

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mass of H₂ from the balanced equation = 3 × 2 = 6 g

Molar mass of NH₃ = 14 + (3×1) = 17 g/mol

Mass of NH₃ from the balanced equation = 2 × 17 = 34 g

SUMMARY

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂ to produce 34 g of NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

36.52 g of N₂ will react with = (36.52 × 6) / 28 = 7.83 g of H₂

From the above calculation, we can see that only 7.83 g out of 10.62 g of H₂ are required to react completely with 36.52 g of N₂.

Therefore, N₂ is the limiting reactant

From the balanced equation above,

28 g of N₂ reacted to produce 34 g of NH₃

Therefore,

36.52 g of N₂ will react to produce = (36.52 × 34) / 28 = 44.35 g of NH₃

Thus, the maximum mass of NH₃ obtained from the reaction is 44.35 g

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Answer:

The pressure of a given amount of gas is directly proportional to the temperature at a given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac's law.

Answer:this air polluction here.

Explanation:

air and soil polluction

Considering the Hess's Law, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

Hess's law, also called Law can also be called Law of additivity of the enthalpies of reaction, it is a useful method when it is not possible to calculate the enthalpies of reaction from the enthalpies of formation, or in reactions in which the reaction enthalpy cannot be determined experimentally because it is very slow or very explosive.

Hess's law states that when reactants are converted to products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.

In this way, Hess's Law determines that when a chemical reaction can be expressed as an algebraic sum of other reactions, its reaction enthalpy is equal to the sum of the enthalpies of the partial reactions. In this way, it allows thermochemical equations to be treated as algebraic equations, and can be added, subtracted, or multiplied by a number to find the desired thermochemical equation.

Hess's Law states that the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

That is, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

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Answer:

black.

Explanation:

I like seeing myslef, so therefore with black eyes I would be seeing my reflection

Answer:

Boiling: The process of conversion from liquid to gas on heating is called boiling.

Example: Water on heating turns into water vapour.

Melting: The process of conversion from solid to liquid at room temperature is called melting.

Example: Ice cream melting at room temperature.

Sublimation: The Conversion of solid to gas directly is called sublimation.

Example: Camphor, Dry ice

Explanation:

Hope it helps you:))))

Answer:

1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.

2. The two key components of ecosystem stability are resilience and resistance.

3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population

4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.

Answer:

C

Explanation:

The powdered iron has a greater surface area than the single piece of metal, allowing reactions to be done faster.

It's NOT A because in the reaction Iron is a reactant NOT a catalyst

It's NOT B because it's completely irrelevant to the question

It's NOT D because it's also not relevant to the question at hand

Covalent bonding is the sharing of electrons between atoms. The electronegativity difference of 1.7 is the largest for a bond to be covalent. Thus, option B is accurate.

The electronegativity difference is the parameter used to determine the polarity and the type of the bond formed by the atom of the species. it gives the measure of the atom to attract the shared electrons.

For a covalent bond to form the electronegativity difference between the two atoms of the molecules must be less than 2. A difference of more than 2 results in ionic bond formation.

Therefore, option B. 1.7 is the highest electronegativity difference for a covalent bond formation.

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Answer:

The oceans obtained freshwater from glaciers melting. The freshwater was then trapped into small places below waves, which could be a reason why there is not much freshwater in the world.

Considering Gay-Lussac's law, a gas exerts a pressure of 4.00 atm at 1,092 K.

Gay-Lussac's law states that the pressure of a gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.

Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T}=k[/tex]

where P= pressure, T= temperature, k= Constant

This law states that the ratio of pressure to temperature is constant.

Studying an initial state 1 and a final state 2, it is fulfilled:

[tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex]

In this case, you know:

Replacing in Gay-Lussac's law:

[tex]\frac{1 atm}{273 K}=\frac{4 atm}{T2}[/tex]

Solving:

[tex]T2\frac{1 atm}{273 K}=4 atm[/tex]

[tex]T2=\frac{4 atm}{\frac{1 atm}{273 K}}[/tex]

T2= 1,092 K

Finally, a gas exerts a pressure of 4.00 atm at 1,092 K.

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Glutamic amino acid is the non-essential amino acid and an excitatory neurotransmitter. When Glu is found in the core then the pKa of the side chain group increases.

pKa is the acid strength or the estimate that shows whether the solution is weak or strong acid. pKa less than zero is a strong acid and portrays the bonding of the proton by the acids.

In the Glu amino acid, the value of the pKa of the side chain functional groups increases as the amino acid is found in the interior of the water-soluble folded protein structure.

Therefore, the pKa of the side-chain increases.

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Answer:

keep it from being washed away by water

ANSWER

B po yung ans:)

Answer:

on-skin silicone, liquid latex, and gelatine

Explanation:

hope this helps:)

Answer:

1. We get the symbol and formulas of the reactants and products.

2. The physical state of the reactants and products.

3. From this reaction, we can know the molecular formula of ammonia, water and nitrogen.

4. Here all the species are in a gaseous state.

5. The reaction takes place at a high temperature and pressure.

6. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as:

Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO 4→ZnSO 4 +H2.

The phase of water at 0.5 atm and 100°C is gaseous phase.

Water exists in three different phases such as liquid, gas, and solid.

The phase of the given water can be determined using phase diagram at standard temperature and pressure as shown in the image uploaded.

At 0.5 atm and 100 °C, the water is still in vapour or gaseous phase.

Thus, the phase of water at 0.5 atm and 100°C is gaseous phase.

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The spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.

A compound is a substance formed by combining two or more different chemical elements in such a way that the atoms of the individual elements are linked together by chemical bonds that are difficult to break in chemistry.

Hence it is right to state that the spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.

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…Answer:

Explanation:

Let's see

moles of CO_2

Mass of CO_2

Answer:

299.60 g

Explanation:

Use the formula q = mCΔT (q= heat, m= mass, c = specific heat for that specific substance, ΔT is change in temperature Final Temp - Initial Temp)

Released heat means it has negative sign.

q = mCΔT

-2744 = (mass) (0.129) (19-90)

mass= 299.60 g

Ideal gas law states

V is volume (L), P is pressure (atm), R is universal gas constant: 0.0821 L·atm/mol· K, n is number of moles, T is temperature in Kelvin

Here given:

[tex]\blacksquare[/tex] mass of O₂ : 100 gram

[tex]\blacksquare[/tex] moles: mass/molar mass = 100/32 = 3.125 moles

[tex]\blacksquare[/tex]  25.0 °C = (25+273.15) = 298.15 K

[tex]\blacksquare[/tex]  pressure: 1.25 atm

Volume:

[tex]\boxed{\sf V=\dfrac{nRT}{P}}[/tex]

[tex]\Rightarrow \sf V=\dfrac{(3.125 \ x \ 0.0821 \ x \ 298.15 )}{1.25}[/tex]

[tex]\Rightarrow \sf V=61.195 \ L[/tex]

[tex]\Rightarrow \sf V=61.2 \ L \ \ \ (rounded \ to \ nearest \ tenth)[/tex]

Additional Explanation:

In Liters: 61.2 Liters

In cubic meter: 0.061163 m³

In cubic centimeter: 61,163.5 cm³

The best explanation would be that the temperature of the gas has dropped before measuring the pressure.

According to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.

Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.

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The total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

The balanced chemical equation of nitrogen gas and oxygen gas is determined as follows;

N₂  + 2O₂  → 2NO₂

PV = nRT

P(total) = P(N₂) + PO₂

P(total) = 1 atm + 2(1 atm)

P(total) = 3 atm

Thus, the total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

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Answer:

The stigma on the underside of the leaf allows Gas and Water Vapour to move in and out of the leaf