barium reacts with cobalt (iii) cyanide to produce

The rate of the reaction greatly accelerates when MnO2 is added to a hydrogen peroxide solution. For the breakdown of hydrogen peroxide, manganese dioxide serves as a catalyst.

Hydrogen peroxide breaks down into water and oxygen gas when manganese dioxide is present.

A metal oxide catalyst also facilitates the exothermic breakdown of hydrogen peroxide into water and oxygen (eq 1). (2) Using a catalyst, such as MnO2, lowers the activation energy to around 58 kJ/mol (1) and speeds up the breakdown by more than 1000 times compared to the uncatalyzed reaction.

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We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.

Here's an overview of the catalytic cycle, including the necessary details:

i. Chemical structure of the catalyst:

Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]

ii. Molecular geometry of the catalyst:

The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.

iii. Type of reactions involved:

The catalytic cycle involves several reactions, including:

iv. Starting material, reagent, and solvent:

The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).

v. Major and minor end-products:

The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.

vi. Intermediates:

The intermediates in the catalytic cycle include:

These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.

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Explanation:

hdhehdbrhdns dhdjdjdhrjs dhfirjr rudjdbe dbdud d

Answer:

Matter can change from one state to another if heated or cooled. If ice (a solid) is heated it changes to water (a liquid). This change is called MELTING. If water is heated, it changes to steam (a gas).

Explanation:

The change in enthalpy when 90.6 g of steam at 100◦C is converted to liquid water at the same temperature and pressure is 204.7 KJ

First, we shall obtain the number of mole water converted to steam. details below:

Mole = mass / molar mass

Mole of water = 90.6 / 18

Mole of water = 5.03 moles

Finally, we shall determine the change in enthalpy. Details below:

ΔH = n × ΔHv

ΔH = 5.03 × 40.7

ΔH = 204.7 KJ

Thus,  we can conclude that the change in enthalpy is 204.7 KJ

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The standard deviation of ksp is 2.646 x 10⁻⁶ and the relative standard deviation kf ksp (%RSD) is 27.56%.

To calculate standard deviation of Ksp, first, find the deviations of each trial's Ksp value from the average Ksp value:

Trial 1 = (10 x 10⁻⁵) - (9.6 x 10⁻⁶) = 9.04 x 10⁻⁶

Trial 2 = (8.0 x 10⁻⁵) - (9.6 x 10⁻⁶) = 7.04 x 10⁻⁵

Trial 3 = (11 x 10⁻⁵) - (9.6 x 10⁻⁶) = 1.04 x 10⁻⁴

Square each deviation and find the average:

(9.04 x 10⁻⁶)² + (7.04 x 10⁻⁵)² + (1.04 x 10⁻⁴)² = 2.098 x 10⁻¹⁰

Average = 2.098 x 10⁻¹⁰ / 3 = 6.993 x 10⁻¹¹

Finally, take the square root of the average to get the standard deviation of Ksp:

Standard deviation of Ksp = √(6.993 x 10⁻¹¹) = 2.646 x 10⁻⁶

To calculate the relative standard deviation of Ksp (%RSD):

%RSD = (standard deviation / average) x 100%

%RSD = (2.646 x 10⁻⁶ / 9.6 x 10⁻⁶) x 100% = 27.56% (rounded to two decimal places)

Therefore, the standard deviation of Ksp is 2.646 x 10⁻⁶ and the relative standard deviation of Ksp (%RSD) is 27.56%.

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The balanced equation for the reaction between solid calcium cyanide and liquid water to generate calcium hydroxide and hydrogen cyanide would be \(Ca(CN)_2 (s) + 2H_2O(l)-- > Ca(OH)_2 (aq) + 2HCN (aq)\)

The reaction between solid calcium cyanide and liquid water to generate calcium hydroxide and hydrogen cyanide would be written as follows:

The chemical formula of solid calcium cyanide = \(Ca (CN)_2 (s)\)

The chemical formula of liquid water = \(H_2O (l)\)

The chemical formula of calcium hydroxide in solution = \(Ca(OH)_2 (aq)\)

The chemical formula of hydrogen cyanide in solution = \(HCN (aq)\)

Bringing all the species together, the equation for the reaction would be:

But the above equation is not balanced. The number of hydrogen and cyanide atoms is not balanced. Balanced chemical equations always have an equal number of every atom in the reactants and in the products.

Thus, the balanced equation of the reaction would be;

\(Ca(CN)_2 (s) + 2H_2O(l)-- > Ca(OH)_2 (aq) + 2HCN (aq)\)

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Answer:

a. H and P

Explanation:

A covalent bond is formed between 2 nonmetals, which share pairs of electrons to complete the octet in their valence shells. The polarity of the bond depends on the difference in electronegativity between both atoms. If ΔEN = 0, the bond is nonpolar. If ΔEN > 0, the bond is polar.

Which of the following set of atoms has a nonpolar covalent bond?

a. H and P . YES. H and P are nonmetals and ΔEN = |EN(H)-EN(P)|=|2.1-2.1|=0.

b. N and C . NO. ΔEN = |EN(N)-EN(C)|=|3.0-2.5|=0.5.

c. Li and O. NO. Li is a metal and O is a nonmetal.

d. Cl and Ca. Ca is a metal and Cl is a nonmetal.

when a circuit is open the electricity fails to pass through any of the wire causing all the lights to go out. If the lights are in a straight line each light is on its own circuit to the power source.

Answer:

B

Explanation:

The solubility depends on the ksp. As the value of ksp increases the compound becomes more and more soluble.

In the options, the highest ksp value is 10^-10, thus that one is the most soluble.

Answer:

True

Explanation:

Solid molecules don't move.

Molecule of a solid are tightly packed there is no space between them so there is no movement of the molecule.

The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.

true

Answer:

Explanation:

Atomicity is defined as the total number of atoms present in a molecule.

Answer:

D. 76%

Explanation:

Percent yield=actual/theoretical * 100

38/50 * 100 = 76%

Absolute error is the positive difference between the estimated value minus the actual value. A 25 mL burette will have different volume markings. What you can do is make different volume measurements. About three would be sufficient. You can measure 25, 15 and 5 mL.

Now, that will be the estimated volume value. To determine what the actual value is, what you can do is weigh the samples taken with a properly calibrated balance. Let the balance have one or two decimal places. With the density of the substance you use and the mass of the balance you can calculate the actual volume.

Then the procedure would be as follows:

1. Measure a certain amount of volume with the burette, e.g. 25 mL. You can use water. This will be the estimated volume.

2. Weigh the empty burette and then weigh it with the measured water content. The difference will be the weight of water with a volume of 25 mL.

3. Now you use the density of the water, at the temperature and pressure you are working at.

4. Using the density formula, you make the change from mass to volume. This will be the actual volume

5. Make the difference between the estimated volume minus the actual volume. This will be the absolute error.

The specific heat capacity of the object is C = Q / (ΔT ⨉ m).The specific heat capacity of the object is 0.022.

The amount of heat or energy needed to raise a substance's temperature by 1 °C per unit mass of that substance is known as its specific heat capacity.

The equation is: C = Q / (T m).

Q= mc T

715 J = 105g * c* 298.5

715/ 105* 298.5 =c

715/ 31342.5 =c

0.022 =c

Therefore, The specific heat capacity of the object is C = Q / (ΔT ⨉ m).The specific heat capacity of the object is 0.022.

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The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

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Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

Answer: Fe2+ & Mn3+

Explanation:

The pair of ions that are not isoelectronic is  Fe2+ and Mn3+.

Isoelectronic ions are ions that have the same number of electrons. In order to decide which of the species are not isoelectronic, we must look at the options carefully.

If we count the number of electrons in each pair of ions, we will discover that  Fe2+ has 24 electrons while Mn3+ has 22 electrons. These two species do not have the same number of electrons hence they are not isoelectronic.

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Answer:

B) Ivory

Explanation:

Ivory is a hard, white material from the tusks and teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks.

Platinum, Silver, and Gold are precious metals, meaning they are rare metallic chemical elements of high economic value, shiny, hard, strong with high melting points

Ivory is regarded as the least of the options. Ivory consists of dentine and

are usually found in the tusks and teeth of animals such as elephants. They

however don't have much value as the other metals in the options.

Precious metals  include the following:

They are used for ornamental purposes. They are usually mined and refined

to produce a variety of objects.

Their use are however legal and they are expensive which makes the Ivory

the least out of the options provided.

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Answer:

c and d are correct

Explanation:

In A, false because in Valence Electrons, the more the valences, the more stable an atom is.

In B, false because atoms cannot readily gain or lose valence electrons as the number of valence electrons is determined by the column they are in.

In C, true because the more the valence electrons, the more the stability of an atom.  

In D, true as electron placing is important and the reactivity of an atom is important.

So C and D are true!

The statement(s) which are true about valence electrons are:

c. Atoms are stable when they have as many valence electrons as possible.

d. Valence electrons determine many of the properties of an atom.

An atom refers to the smallest, indivisible unit that isnmade up of matter and forms all chemical elements.

In Chemistry, an atom comprises three (3) distinct particles and these are;

Valence electrons is simply the number of electrons that is/are present in the outermost shell of the atom of a chemical element.

Generally, valence electrons are typically used to determine whether an atom or group of chemical elements can bond with other chemical elements.

As a general rule, atoms with as many valence electrons as possible are more stable and reaches an octet state.

Lastly, valence electrons are used to determine the chemical properties of of the atom of a chemical element.

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Answer:

Iodide> Bromide > chloride > flouride

Explanation:

During a nucleophilic substitution reaction, a nucleophilie replaces another in a molecule.

This process may occur via an ionic mechanism (SN1) or via a concerted mechanism (SN2).

In either case, the ease of departure of the leaving group is determined by the nature of the C-X bond. The stronger the C-X bond, the worse the leaving group will be in nucleophilic substitution. The order of strength of C-X bond is F>Cl>Br>I.

Hence, iodine displays the weakest C-X bond strength and it is thus, a very good leaving group in nucleophillic substitution while fluorine displays a very high C-X bond strength hence it is a bad leaving group in nucleophilic substitution.

Therefore, the ease of the use of halide ions as leaving groups follows the trend; Iodide> Bromide > chloride > flouride

The quantity of β-hydroxybutyrate the bear can produce

during hibernation is 3,073.30grams.

Hibernation is defined as the period of less activity by animals to conserve energy to survive coarse weather conditions.

A typical example of an animal that hibernates is the bear.

From the question, a bear is able to accumulate 25kg (25000grams) of triglyceride.

To calculate quantity of β-hydroxybutyrate that would be produced from 25kg triglyceride;

846g of triglyceride = 104grams of β-hydroxybutyrate

25000g of triglyceride = x grams

(Cross multiple to solve for x grams)

X = 104 × 25000/846

\(x = \frac{104 \times 25000}{846} \)

\(x = \frac{2600000}{846} \)

\(x = 3073.30grams\)

Therefore, the quantity of β-hydroxybutyrate the bear can produce during hibernation is 3,073.30grams.

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The identity of a cation solution that produces a mix of red and yellow colors in a flame test, but appears red when viewed through a cobalt filter, can be attributed to the presence of the strontium (Sr) cation.

During a flame test, different metal cations emit characteristic colors due to the excitation of electrons and their subsequent emission of light. Strontium, in particular, is known to produce a vibrant red color in flame tests.

The presence of both red and yellow colors indicates the possibility of multiple metal cations in the solution. While the specific metal responsible for the yellow color is uncertain, it could potentially be sodium or another metal that emits a yellow flame.

When the flame is viewed through a cobalt filter, which absorbs yellow wavelengths of light, the yellow color is filtered out, resulting in only the red color being observed. Since strontium is known for its distinctive red flame color and its emission is not affected by the cobalt filter, it is likely the metal cation responsible for the observed red color. Therefore, based on these characteristics, the identity of the cation solution is most likely strontium (Sr).

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Answer:

             You are right. The answer is 3Pi.

Reason:

             In this problem all parameters are kept the same. Except of one thing. The only thing which is changing is the number of moles. If you look at the balanced chemical equation 1 mole of  methanol is producing 1 mole of carbon monoxide and 2 moles of  hydrogen gas.

Hence, before reaction we have one mole of gas and after reaction completion we have three moles of product.

According to Ideal gas equation,

P V = n R T

V, R and T are constant hence.

P = n

Hence, three moles of gas will produce 3P.

Let me know if you need more assistance.

Answer:

A.) Change only the coefficients

Explanation:

An equation is balanced when there is an equal quantity of each type of element on both sides of a reaction. When balancing an equation, the only way to manipulate the amounts of each element is by changing the coefficient values. The coefficients alter the amount of each molecule in the reaction.

The subscripts cannot be altered. If you were to change the subscripts, you would be altering the amount of atoms in a particular molecule.

It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.

A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.

Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.

The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.

The strength of the bond is in the following order: H.....F > H.....O > H......N

The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.

Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.

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Answer:uses world like

Explanation:

Explanation:

the definition of genuine:

genuinly means honestly or truley

Answer:

solid, liquid and gas

Explanation:

Three states of matter exist—solid, liquid, and gas. Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

A, because the shape of it forms and arc much like a H2O molecule.