Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in and the atom emits a photon of light with a wavelength of 486 nm.

The heat of fusion (δhfus) of benzene (c6h6) is 10. 0kjmol while its heat of vaporization (δhvap) is 34. 1kjmol then enthalpy of sublimation (δhsub) of benzene is 44.1 kJ mol.

The heat of fusion is amount of heat involved during conversion of solid into liquid.

Solid →  liquid

The heat of vaporization is amount of heat involved during conversion of liquid into vapor.

liquid →  vapor

The enthalpy of sublimation is amount of energy involved during conversion of solid into vapor.

Solid → vapor

The enthalpy of sublimation is equal to sum of  heat of fusion and  heat of vaporization .

Mathematically,  heat of sublimation =  heat of fusion + heat of vaporization .

heat of sublimation =  10. 0 kJmol +  34. 1 kJmol. = 44.1 kJ mol

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A sizable organ that grows during pregnancy is the placenta. It is typically at the top or side of the uterine wall where it is attached. The placenta and your baby are joined by the umbilical cord. Through the placenta's filtering of the mother's blood and the umbilical cord, your baby receives oxygen, glucose, and other nutrients.

A sizable organ that grows during pregnancy is the placenta. It is typically at the top or side of the uterine wall where it is attached. The placenta and your baby are joined by the umbilical cord.

Blood from the mother filters oxygen, glucose, and other nutrients before traveling via the placenta and reaching your baby through the umbilical cord.

Blood from the mother filters oxygen, glucose, and other nutrients before traveling via the placenta and reaching your baby through the umbilical cord. Additionally, the placenta filters out elements that can be dangerous to your unborn child and eliminates waste products and carbon dioxide from your unborn child's blood.

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Answer: Homogeneous catalyst

Brass is an alloy of copper and zinc and is durable, malleable and sonorous.

Alloys are products which are obtained from a mixture of two or more metallic elements.

Alloys are preferred to the individual elements because they combine the desirable properties of their component elements.

An example of an alloy is brass.

Brass is mixture of copper and zinc. It combines the shiny and anti-rust properties of zinc with the durability and sonorous property of copper.

It very sonorous and malleable and is used in many musical instruments.

In conclusion, alloys are produced by mixing two or more metals together.

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Fluids used for an intravenous fluid transfusion must be isosmotic with bodily fluids.

Intravenous fluids, sometimes abbreviated as "IV fluids," are liquids that are administered to replace water, sugar, and salt that you may need if you're ill or having surgery and are unable to eat or drink regularly. Through a drip, Intravenous fluids are administered directly into a vein.

In order to treat or prevent dehydration, Intravenous fluids are carefully prepared liquids that are injected into a vein. They are applied to patients of all ages who are ill, hurt, becoming dehydrated from physical activity or the heat, or who are having surgery. Rehydrating intravenously is a straightforward, risk-free treatment that is frequently used.

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2.18 mg of naoh is needed to prepare 546 ml of solution with a ph of 10.00.

What is Molarity?

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.

We want pOH 4 NaOH solution

Given, pH (10) convert to pOH

pOH = 4; pOH = -log (OH⁻) = 1 x 10⁻⁴ M = NaOH

Once we have got the Molarity = Moles of NaOH/Litre of soln.

Stoich = 1 x 10⁻⁴ M/L X 0.546 L X 40 g NAOh/1 mol

Naoh = 2.18 X 10⁻³ g NaOH = 2.18 mg

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Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the given equation

Cu + NO₃⁻ → Cu⁺² + NO₂

Here we can see that all atoms other than O and H are balanced.

In the given equation oxidation number of Cu changes from 0 to +2.

In the given equation oxidation number of N changes from 5 to 4.

Now multiply by 2 with NO₃⁻ and NO₂.

Cu + 2NO₃⁻ → Cu⁺² + 2NO₂

Now ad the water molecules in right hand side to balanced the O atoms.

Cu + 2NO₃⁻  → Cu⁺² + 2NO₂ + 2H₂O

Now add 4H⁺ on the left hand side to balance the H atoms.

Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O

Thus from the above conclusion we can say that Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.

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Answer:

825.5 mm

Explanation:

850 mm is the total pressure of the two gases....subtract the water vapor pressure and the remainder is due to the oxygen

850-24.5 = 825.5 mm

Answer:

        no of atoms =   13.9 x 10^25

Explanation:

                No. of moles = mass of compound / molar mass of   compound

       As ; mass of sodium = 5.3 x 10^3 g

        Molar mass of sodium = 22.9 g/ mol

        putting values  

         n = 5.3 x 10^3 / 22.9

         n = 231.4 mol

Also; no of mol (n) = no of particles / Avagadros number

               so no of particles = n x Avagadros no.

               put n = 231.4 and Avagadros no = 6.023 x 10^23

                 no of particles = 231.4 x 6.023 x 10^23

                                   =   13.9 x 10^25  

The electrons are transferred in the given redox reaction are 2 electrons.

When oxidation and reduction that is gaining of electron and loosing of electrons takes place simultaneously in a chemical reaction then it would be known as redox reaction.

In terms of oxygen the gaining of oxygen is oxidation and loosing of oxygen is reduction.

In the given chemical reaction the transfer of two electrons will be as follows

Zn₂ (2e) + AgNo₃ → 2Ag (2e) + Zn(NO₃)₂

It is clear from the reaction their is transfer of two electrons zinc is loosing 2 electrons undergoes to oxidation while silver gets reduced.

Therefore, transfer of only two electrons.

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The equilibrium constant of the system is 11.3.

We know that the equilibrium constant shows the extent to which reactants are converted into products.

Now;

2NO2 ⇄ N2O4

[NO2] = 0.500 mol /1 L =  0.500 M

[N2O4] =  0.186 mol  /1 L =  0.186 M

The ICE table is;

          2NO2 ⇄ N2O4

I           0.5           0

C         -2x              +x

E          0.5 - 2x     0.186

The concentration of NO2 at equilibrium = 0.5 - 2(0.186) = 0.128

Keq =  0.186/( 0.128)^2

Keq = 11.3

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The second set of cations can be separated using solubility-product constants.

The creation of a new bond between the molecules of the solute and the solvent is known as solubility. Solubility is the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.

The amount of oil that will dissolve in the water column at a specific temperature and pressure is known as its solubility in water. The compound's water solubility increases with increasing polarity. The high water solubility of BTEX chemicals is one reason why they are found in groundwater so frequently. The ability of a medicine to dissolve is essential to its effectiveness. A drug substance cannot be absorbed without it, which results in limited bioavailability.

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Answer:

3.0 moles Al₂O₃

Explanation:

We do not know which of the reactants is the limiting reactant. Therefore, you need to convert both of the given mole values into the product. This can be done using the mole-to-mole ratio made up of the balanced equation coefficients.

4 Al + 3 O₂ -----> 2 Al₂O₃

6.0 moles Al            2 moles Al₂O₃
----------------------  x  -------------------------  =  3.0 moles Al₂O₃
                                    4 moles Al

4.0 moles O₂           2 moles Al₂O₃
----------------------  x  -------------------------  =  2.7 moles Al₂O₃
                                    3 moles O₂

As you can see, O₂ produces the smaller amount of product. This means O₂ is the limiting reactant. Remember, the limiting reactant is the reactant which runs out before the other reactant(s) are completely reacted. As such, the actual amount of Al₂O₃ produced is 2.7 moles.

However, since this problem is directly addressing how much Al₂O₃ is produced from Al, the answer you most likely are looking for is 3.0 moles Al₂O₃.

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The equilibrium constant for the un-catalyzed reaction is 0.9

The enzyme triose phosphate isomerase catalyzes the reaction in the forward direction as part of the glycolytic pathway. It follows simple Michaelis-Menten kinetics.

Typical cellular concentrations:

triose phosphate isomerase = 0.1 nM

dihydroxyacetone phosphate = 5 µM

glyceraldehyde-3-phosphate = 2 µM

So, equillibrium constant is

K = [tex]\frac{[P]}{[S]}[/tex]

K = [tex]\frac{ glyceraldehyde-3-phosphate}{dihydroxyacetone phosphate}[/tex]

Therefore, The equilibrium constant for the un-catalyzed reaction is 0.9

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Answer:

[tex]\frac{1 m}{100 cm}[/tex]

Explanation:

The final answer has a different set of units. In particular, meters (m) changes to centimeters (cm). To make this change, you need to multiply the first value by proportions.

When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since m is located in the denominator, it must be located in the numerator of the conversion.

Proportion:

1 m = 100 cm

The full expression:

As you can see, the old unit (m) cancels out and you are left with cm in the denominator.

Option (d) acetylcholine is the right answer.

Acetylcholine is the chemical compound released by the motor-neuron axon terminals.

Chemically speaking, acetylcholine is an organic chemical that is an ester of acetic acid and choline.

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Answer:

3 NaOH +  H₃PO₄ ----->  Na₃PO₄ + 3 H₂O

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another. Therefore, Na⁺ (from NaOH) is swapped with H⁺ (from H₃PO₄). When constructing the new compounds, you may need to alter the amount of each ion within a particular compound to to make it neutral.

New Product #1: Na₃PO₄

----------> Na⁺ and PO₄³⁻

----------> +1 + 1 + 1 + (-3) = 0

New Product #2: H₂O (or HOH)

----------> H⁺ and OH⁻

----------> +1 + (-1) = 0

Now that you know the products, you need to balance the chemical equation. An equation is balanced when there is an equal amount of each element on both sides. These amounts can be modified by adding coefficients.

The unbalanced equation:

NaOH + H₃PO₄ -----> Na₃PO₄ + H₂O

Reactants: 1 sodium, 5 oxygen, 4 hydrogen, 1 phosphorus

Products: 3 sodium, 5 oxygen, 2 hydrogen, 1 phosphorus

The balanced equation:

3 NaOH +  H₃PO₄ ----->  Na₃PO₄ + 3 H₂O

Reactants: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

Products: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

**I was having trouble balancing the equation with the reactant H₂PO₄⁻. From my experience, I believe this compound may have been mistyped. As such, I used H₃PO₄. Please let me know if the reactant was written properly**

If an atom were scaled up to the size of a sports arena, the space filled by the positive charges inside the atom (according to the work of ernest Rutherford early in this century) would be very small (perhaps size of the soccer ball).

A classical atoms based on Rutherford's model is doomed to collapse. An atom has highly non-uniform mass distribution in Rutherford's model.The positively charges part of the atom possess most of the mass in Rutherford's model. The positive charge and most of the mass of the atom were densely concentrated in extremely small region . This small region is called nucleus according Rutherford's model.

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The oxidation state of a pure element is always zero.

The oxidation state for a pure ion is equivalent to its ionic charge.

What is oxidation state?

The oxidation state or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic. The oxidation state may be positive, negative or zero.

What are the rules to write the oxidation number?

1. The atoms in pure elements have oxidation number of ZERO.

2. The more-electronegative element in a binary molecular compound is assigned the number equal to the negative charge it would have as an anion. The less-electronegative element is assigned the number equal to the positive charge it would have as a cation.

3. Fluorine always has an oxidation number of -1 in compounds because it is the most electronegative element.

4. Oxygen is usually -2 unless in peroxides (then it is -1) or with fluorine.

5. Hydrogen has +1 in all compounds containing elements that are more electronegative than it, and is -1 in compounds with metals.

6. The algebraic sum of the oxidation numbers of all atoms in a neutral compound is zero.

7. The algebraic sum of the oxidation numbers of all atoms in a polyatomic ion is equal to the charge of the ion.

8. Although rules 1-7 apply to covalently bonded atoms, oxidation numbers can also be assigned to atoms in ionic compound. Monoatomic ions have oxidation numbers equal to their ionic charge.

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Warmer air can hold more water vapor than colder air.

Your home's windows are fogged with condensation. A musty odor can be detected in the air inside your home. When you breathe in, you can feel the moisture in the air. These indicators indicate that you should act quickly. Moisture levels in your home raise the overall temperature and make it feel hot.

Humidity is classified into two types: absolute and relative.

The former describes the humidity present in a parcel of air without taking temperature into account, whereas the latter describes the humidity present in the air while taking temperature into account. The former defines the amount of water content by dividing the parcel's weight by its volume, whereas the latter is calculated by dividing the amount of water content present by the total capacity of the parcel of air to hold multiplied by 100. The former decreases with height, whereas the latter becomes saturated when it reaches 100%.

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Explanation:

if its the same compound what happened to make it different?

they were put in water

lot of those compounds have Cl in them making them salts

NaCl is Sodium Chloride which is regular table salt

In water, the sodium atoms and chlorine atoms separate

They move around in the water as positively and negatively charged ions.

This separation of charge allows the solution to conduct electricity.

britannica

Taking into account definition of percent yield, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.

In first place, the balanced reaction is:

2 KClO₃ → 2 KCl + 3 O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theorical yield)×100

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the definition of percent yields:

65= (8 grams÷ theorical yield)×100

Solving:

theorical yield= (8 grams÷ 65)×100

theorical yield= 12.31 grams

Then, this means that you need to find the mass of KClO₃ would theoretically produce 12.31 g of O₂.

The following rule of three can be applied: If by reaction stoichiometry 96 grams of O₂ are produced by 245.1 grams of KClO₃, 12.31 grams of O₂ are produced by how much mass of KClO₃?

[tex]mass of KClO_{3} =\frac{12.31 grams of O_{2}x245.1 gramsof KClO_{3} }{96 grams of O_{2}}[/tex]

mass of KClO₃= 31.43 grams

Finally, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.

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The consideration element is the correct answer.

The exchange of the value is called consideration. The exchange of money is known as value for anything such as services/property, exchange of property, or services.

There are many types of considerations that are given below:

The four important elements of a contract are given below:

If any of the given elements is missing then the contract is voided, and the parties released from the agreement.

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Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy.

Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy. Every internally reversible operation in a closed system generates entropy. Entropy remains constant in an adiabatic and internally reversible process of a closed system. Isolated systems' entropy cannot diminish.

When a system is not isolated but is in contact with its surroundings, the entropy of the open system may drop, requiring a balancing rise in the entropy of the surroundings. During a process, the entropy of an isolated system constantly increases, or in the case of a reversible process, remains constant (it never decreases).

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The NMR spectroscopy will be used for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane.

A spectroscopic method for observing the local magnetic fields surrounding atomic nuclei seems to be nuclear magnetic resonance spectroscopy, also referred to as magnetic resonance spectroscopy as well as NMR spectroscopy.

The identification and study of organic molecules benefit greatly from nuclear magnetic resonance (NMR) spectroscopy. This type of spectroscopy has a straightforward underlying theory. Numerous atom types' nuclei behave like small magnets and frequently align themselves in magnetic fields.

Therefore, the NMR spectroscopy will be used for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane.

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Answer:

you better give me brainliest

Explanation:

Zinc nitrate and calcium nitrate solution can be distinguished by reaction with ammonium hydroxide. Zinc forms a white gelatinous ppt. whereas there is no precipitation of calcium hydroxide even with excess of ammonium hydroxide

The Chlorine and fluorine atoms are  the most electronegative.

So, option D and E is correct one.

The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.

The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .

Example:

The elctronegativity of fluorine atom = 3.98

The elctronegativity of chlorine atom =3.16

The elctronegativity of carbon atom = 2.25

The elctronegativity of phosphorus atom = 2.19

The elctronegativity of silicon atom = 2.58

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Answer:

4.43 g Cl₂

Explanation:

To find the mass of Cl₂, you need to (1) convert moles HCl to moles Cl₂ (via the mole-to-mole ratio from equation coefficients) and then (2) convert moles Cl₂ to grams (via the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 significant figures like the given value.

4 HCl(g) + O₂(g) -----> 2 Cl₂(g) + 2 H₂O(g)
^                                   ^

Molar Mass (Cl₂): 2(35.453 g/mol)

Molar Mass (Cl₂): 70.906 g/mol

0.125 moles HCl          2 moles Cl₂             70.906 g
--------------------------  x  ----------------------  x  -------------------  =  4.43 g Cl₂
                                     4 moles HCl              1 mole