Balance the following oxidation-reduction reactions:
a) CN- + MnO4- --->CNO- + MnO2 (in basic solution)
b) (Cr2O7)2- + (C2O4)2- --->Cr3+ + CO2 (in acidic solution)
c) H2(g) + Ni2+ (aq) ---> H+ (aq) + Ni(s)

When the angular momentum quantum number (l) of an electron is 2, the electron will be found in a d orbital.

In the quantum mechanical model of the atom, electrons are described by a set of quantum numbers that define their characteristics and behavior within an atom. The angular momentum quantum number (l) is one of these quantum numbers and determines the shape of the orbital.

The value of l can range from 0 to n-1, where n is the principal quantum number. Each value of l corresponds to a specific type of orbital. When l = 2, the electron is in a d orbital.

Orbitals are regions of space where there is a high probability of finding an electron. The d orbitals have complex shapes and can be visualized as four-leaf clovers or double with different orientations. They can accommodate a maximum of 10 electrons (two in each of the five d orbitals).

Therefore, if the angular momentum quantum number (l) of an electron is 2, it indicates that the electron is in a d orbital.

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Answer:

I would say voting. I hope that helped or just report my comment.

Explanation:

The electron configuration of Iron is:

[Ar] 3d⁶4s²

Answer: 15.7 L Fe

Explanation:

\((\frac{4.23*10^{23} molecules Fe }{1} )*(\frac{22.4L Fe}{6.023*10^{23}molecules Fe } )= 15.7 L Fe\)

Basic mole conversion

The volume of 4.23 × 10²³  molecules of Fe is equal to 15.734 L.

Avogadro’s number can be represented as the number of entities in one mole of any substance. Generally, these entities can be molecules, electrons, protons, atoms, or ions, depending upon the chemical reaction or reactant and product.

The value of Avogadro’s number is approximately equal to 6.022× 10²³ mol⁻¹. We know that at STP the volume of any gas or substance is equal to 22.4 liters.

Given, the number of molecules of the Fe =  4.23 × 10²³

The volume of the one mole of Fe = 22.4 L

So 6.022 × 10²³ molecules of Fe have mass = 22.4 L

Then 4.23 × 10²³ Fe molecules will have the volume:

= 4.23 × 10²³ ×22.4/6.022× 10²³

= 15.734 L

Therefore, the volume of 4.23 × 10²³  molecules of Fe is 15.734 liters.

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The cobalt ion is paramagnetic.

The shape of compounds with six atoms or groups of atoms or ligands symmetrically grouped around a central atom, defining the vertices of an octahedron, is described by octahedral molecular geometry, also known as square bipyramidal, in chemistry.

High spin electrons will occupy the d orbitals as if they were degenerate when  Δ is small because the pairing energy is greater than the splitting energy. How little or huge is  Δ also depends on the metal's oxidation state.

[Co(NH₃ )₆ ​]⁺ Due to the existence of an unpaired electron and a high field ligand, the ion 2+ exhibits paramagnetic behavior (low-spin complex). Co is a d⁷ electron system since it is in the +2 oxidation state in this instance. All electrons pair together in the presence of a strong ligand, leaving one electron unpaired.

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I think it is

K2SO4?

Answer:

1 And 2 are soluble in water

Answer:

7ml/g

Explanation:

density=mass/volume

density=14g/2ml

density= 7g/ml

Answer:

nitrate ion,, because it the most electronegative element,,it be formed at the anode

Answer:

Matter

Explanation:

All matter is made up of substances called elements

The net ionic equation for the precipitation reaction between aqueous magnesium chloride (MgCl2) and aqueous sodium phosphate (Na3PO4) can be determined by identifying the precipitate formed. Here's the balanced net ionic equation:

3Mg2+(aq) + 2PO43-(aq) → Mg3(PO4)2(s)

In this reaction, the magnesium ions (Mg2+) from magnesium chloride combine with the phosphate ions (PO43-) from sodium phosphate to form solid magnesium phosphate (Mg3(PO4)2) as the precipitate.

Note that the sodium ions (Na+) and chloride ions (Cl-) are spectator ions and do not participate in the formation of the precipitate. Therefore, they are not included in the net ionic equation.

It's important to note that the state of each compound (whether it is aqueous or solid) should be indicated in the balanced equation.

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Answer:

true

Explanation:

Answer:

False..

Explanation: parasites do not provide you with anything good. The parasite obtains nutrition directly from the body of the host

When 1 mol of I2 is formed from I, 2 moles of electrons are lost.

I- is converted into I2 by the addition of an aqueous solution of KMnO4 to an aqueous solution of KI. To find out how many electrons are lost when 1 mol of I2 is formed from I, we need to balance the following redox reaction:

2I- + 2H+ + 5MnO4- → I2 + 5Mn2+ + 3H2O

First, let's write the oxidation half-reaction for the I- ion as follows:

I- → I2 + 2e-

Therefore, two electrons are lost when one I- ion is oxidized to I2. Thus, in the reaction above, 2 moles of electrons are lost per mole of I2 formed.

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Answer:

Cao +  H2O  ---->Ca(OH)2

Calculate   the  number  of  each   reactant  and  the  moles  of  the  product

that  is

moles = mass/molar mass

The  moles  of  CaO=  56.08g/  56.08g/mol(molar  mass  of  Cao)=  1mole

the  moles  of  water=  36.04 g/18  g/mol=  2.002moles

The   moles  of Ca (OH)2=74.10g/74.093g/mol= 1mole

The  mass  of differences  of  reactant  and  product  can   be  therefore  

explained  as  

1  mole   of  Cao  reacted  completely   with   1  mole   H2O  to  produce  1 mole  of  Ca(OH)2. The  mass  of  water   was  in  excess  while  that  of  CaO  was  limited

Explanation:

The mass difference between reactant and product in the given reaction is " Some water was an excess and makes up the difference in mass".

The quantity of matter that makes up every object or body is the greatest way to understand mass. Everything that we can see has mass.

In a chemical reaction, reactants were chemicals that have been initially present and are utilized to create products.

Calculation of moles

Moles can be determined by a formula.

Moles = Mass / molar mass

Given data

Mass of CaO = 56.0 g

Mass of water = 36.04 g

Moles of CaO = Mass / molar mass

Moles of CaO = 56.0 g / 56.0 g = 1 mole.

Moles of water = 36.04 g / 18 g/mol = 2.002 moles.

Moles of Ca(OH)2 =  74.10 g /  74.10 g/mol = 1 mole.

It can be seen that 1 mole of calcium oxide (CaO ) will be reacted completely. The water was an excess and makes up the difference in mass.

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Answer:

2 CH4O + 3 O2 = 2 CO2 + 4 H2O

Answer:

No

Explanation:

This is because light cannot not whiten Jayden's teeth but light can change materials by hearing it up. There are some substances or tooth paste that can be use to whiten the teeth because of the content they are made off which whitens the teeth. Some of it include baking soda, hydrogen peroxide toothpaste, tumeric toothpaste, toothpaste that contain fluoride.

Answer:

One reason for Jennelle's designs working better is because her aluminum foil sunlight reflector was larger. So. the size of the reflective surface does affect the temperature of the oven. For any given design, the larger the insolated area, the greater the power. Meaning a smaller cooker only collects a small amount of sunlight; no matter how good the design. 

That is one reason why the parabolic solar oven design works so well. Parabolic solar cookers use a parabolic-shaped reflector to direct sunlight to a small area in order to generate heat for cooking. They are able to reach temperatures as high as 400°F. 

Insulating the oven would help it retain heat. Insulation lets you collect more heat and light energy, which allows you to raise the temperature to even higher levels. So, insulation is anything that lets you "hold on to" that collected heat and lose less of it.

A tighter cover would heat the oven faster rather than a looser cover. The parabolic design doesn't have a cover, although the food itself is usually in a pot or container.  

Explanation:

In most designs, using a tighter cover and increasing the reflecting surface will both raise the temperature. Insulation will, however, typically lower the temperature.

It is frequently necessary to add, remove, or adjust elements while designing a product in order to increase its efficiency. The temperature and how to raise or lower it is among the aspects taken into account in items like ovens.

Some methods for raising the temperature include:

Insulation: Since insulation is primarily employed to disrupt the cycle of heat transfer, applying insulation typically entails lowering the product's internal temperature or concentrating the heat in a single location.

Thus, In most designs, using a tighter cover and increasing the reflecting surface will both raise the temperature.

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t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

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The term "supramolecular sorting hat" refers to a concept in chemistry where metal-ligand self-assembly is controlled by complementary hydrogen bonding.

In this context, "supramolecular" means the assembly of molecules or ions into larger, more complex structures, and "sorting hat" is an analogy to the magical hat from Harry Potter that sorts students into different houses based on their characteristics. The "stereocontrol" in this process refers to the ability to control the spatial arrangement of the resulting supramolecular structures. This can be achieved by using ligands that have specific geometries and hydrogen bonding capabilities, which can selectively bind to metal ions and guide the assembly process.

The "complementary hydrogen bonding" refers to the formation of hydrogen bonds between the ligands and the metal ions. Hydrogen bonding is a type of intermolecular interaction where a hydrogen atom bonded to an electronegative atom (such as oxygen or nitrogen) is attracted to another electronegative atom. In summary, the term "supramolecular sorting hat: stereocontrol in metal-ligand self assembly by complementary hydrogen bonding" describes a process in chemistry where the self-assembly of metal-ligand complexes is controlled by complementary hydrogen bonding interactions, leading to the formation of specific supramolecular structures. This concept allows for the selective arrangement of molecules based on their geometries and hydrogen bonding capabilities.

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Answer:

Yes, air is matter because it is a gas composed mostly of nitrogen, oxygen, and argon, and gases do have mass because they’re molecules bouncing around a contained volume (here, the atmosphere). Water vapor, mixed in to some extent with air, is also a gas and therefore has mass.It takes up space and volume

Explanation:

Air is matter because:

It takes up space

It has mass

And it is composed of particles.

Answer: chemical bond

Explanation:

The chemical bond simply refers to the electrostatic attraction that can be found between ions that are oppositely-charged. It should be noted that the chemical bond occurs due to the transfer of electrons that is being found between atoms.

Therefore, based on the question given, the electrostatic attraction that is seen between a positively charged nuclei and the negatively charged electrons which hence allows two atoms to be held together is the chemical bond.

So, the total atomic mass is \(2(1.00794)+32.06+3(15.9994)=\boxed{82.07408 \text{ g/mol}}\)

The concentration of Na in the final solution is 0.01445 M.

To find the concentration of Na in the final solution, we need to consider the stoichiometry of the reaction between Na2CO3 and NaCl.

The balanced equation for the reaction is:

2 NaCl + Na2CO3 -> 3 NaCl + CO2

According to the stoichiometry, two moles of NaCl react with one mole of Na2CO3 to produce three moles of NaCl. Therefore, the amount of NaCl in the final solution will increase by a factor of 3.

Let's calculate the moles of NaCl initially present in the 46.0 mL of 0.1250 M NaCl solution:

Moles of NaCl = Volume (L) × Concentration (M)

             = 0.0460 L × 0.1250 M

             = 0.00575 moles

Since the amount of NaCl increases by a factor of 3, the total amount of NaCl in the final solution will be:

Total moles of NaCl = 3 × 0.00575 moles

                  = 0.01725 moles

Now, let's calculate the moles of Na2CO3 in the 17.5 mL of 0.1050 M Na2CO3 solution:

Moles of Na2CO3 = Volume (L) × Concentration (M)

              = 0.0175 L × 0.1050 M

              = 0.0018375 moles

Since the stoichiometry of the reaction is 2:1 for NaCl and Na2CO3, the moles of Na in the final solution will be half of the moles of Na2CO3:

Moles of Na = 0.0018375 moles ÷ 2

           = 0.00091875 moles

To find the concentration of Na in the final solution, we divide the moles of Na by the total volume of the solution (17.5 mL + 46.0 mL = 63.5 mL = 0.0635 L):

Concentration of Na = Moles of Na ÷ Volume (L)

                  = 0.00091875 moles ÷ 0.0635 L

                  = 0.01445 M

Na is therefore present in the final solution at a concentration of 0.01445 M.

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Formaldehyde is a substance made up of Carbon, Nitrogen, and Oxygen different types of atoms that are chemically combined in a fixed ratio of 1: 2:1. It is classified as an aldehyde.

This refers to a naturally occurring organic compound with the formula CH2O and structure H−CHO. It is also called methanal. The pure compound is a pungent, colorless gas such that it polymerizes spontaneously into paraformaldehyde. It can be stored as an aqueous solution that is formalin. This is also used to store animal specimens.

Formaldehyde is an organic compound. It contains a carbon atom present in its chemical formula. It is also classified as an aldehyde. Formaldehyde(RC=OH) contains a formyl group  and an R group, which is a group that contains carbon and/or hydrogen.

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The metal that does not act as a sacrificial electrode for iron is C. Mn (Manganese).

The element that can be found in both plays and stories is "characters."

Characters are an essential element of both plays and stories. They are the individuals or entities that drive the narrative, interact with each other, and contribute to the development of the plot. In plays, characters are typically portrayed by actors who perform their roles on stage, while in stories, characters are described and depicted through written words.

Characters can be central or supporting figures in a play or story, and they play a vital role in engaging the audience or readers. They have distinct personalities, motivations, and relationships that influence the events and conflicts within the narrative. Through their actions, dialogue, and character development, they contribute to the overall themes and messages conveyed by the play or story.

Whether it is a theatrical production or a written narrative, the presence and portrayal of characters are fundamental to creating engaging and compelling plays and stories.

Thus, the element that can be found in both plays and stories is "characters."

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There are 6 electrons present in the orbital containing (ml=0).

Let the element be X. Now its electronic configuration will be

For 's' orbital the value of l = 0

X(18) = 1s^2, 2s^2, 2p^6, 3s^2, 3p^6

With this electronic configuration, three sublevels are present for the 's' orbital which are 1s^2, 2s^2, and 3s^2 respectively.

Now, let's calculate the electrons in the 's' orbital with l = 0

1s^2, 2s^2, 3s^2 = 2 + 2 + 2

1s^2, 2s^2, 3s^2 = 6

Thus, an atom containing 18 electrons in its ground state has 6 electrons.

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Answer:

Sunflower- The common sunflower (H. annuus) is an annual herb with a rough hairy stem 1–4.5 metres (3–15 feet) high and broad, coarsely toothed, rough leaves 7.5–30 cm (3–12 inches) long arranged in spirals. The attractive heads of flowers are 7.5–15 cm wide in wild specimens and often 30 cm or more in cultivated types.