a paricular vitamin's chemical formula has one colat atom. what is the molar mass of the vitamin if it conatain 4.34% cobalt

Answer:

a. Same group, different period

b. Different group, same period

c. Different group, different period

d. Same group, different period

By mass, the mass of the NaCl solution containing 1.7 g of NaCl with a concentration of 1.66% NaCl is approximately 102.41 g.

To determine the mass of the NaCl solution that contains 1.7 g of NaCl and has a concentration of 1.66% NaCl by mass, you can use the formula:

mass of NaCl solution = (mass of NaCl) / (% NaCl by mass)

First, convert the percentage to a decimal by dividing by 100:

1.66% = 0.0166

Now, plug in the values:

mass of NaCl solution = (1.7 g) / (0.0166)

mass of NaCl solution ≈ 102.41 g

So, the mass of the NaCl solution containing 1.7 g of NaCl with a concentration of 1.66% NaCl by mass is approximately 102.41 g.

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Answer:

2580 years

Explanation:

Since isotope Z has a half-life of 645 years, that means after 645 years, half of the original amount of isotope Z will decay. So, if 1/16 of the original amount is present, that means there have been 4 half-lives (since 2^4 = 16).

Each half-life is 645 years, so 4 half-lives is 4 x 645 = 2580 years.

Therefore, the age of the sample is 2580 years.

Answer: 2KClO3 = 2KCl + 3O2

Explanation:  2KClO3 = 2KCl + 3O2

        Reactants   Products

K             2               2

Cl            2               2

O             6               6

form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH

pOH=-lg[OH-]

[OH-]=8.8 x 10-4 M

pOH=4

pH=14-pOH

pH=10

-lg[H+]=10

[H+]=10^-10

The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M

The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity  the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:

Data obtained from the question

Concentration of Ca(OH)₂ = 8.8×10¯⁴ M  

Concentration of Hydrogen ion [H⁺] =..?  

Determination of the concentration of Hydroxide ion [OH¯]

 Concentration of Ca(OH)₂ = 8.8×10¯⁴ M

Concentration of Hydroxide ion [OH¯] =?  

Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)  

From the balanced equation above,  

1 mole Ca(OH)₂ produced 2 moles of OH¯.

Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M

Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M  

Determination of concentration of Hydrogen ion [H⁺].  Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M

\(H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}\)

Divide both side by 1.76×10¯³  

\(H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\\)

[H⁺] = 5.68×10¯¹² M  

Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M  

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Answer:

The answer is relevant.

Scientific investigations must be well relevant to be sure the data collected will help answer the scientist's question.

A scientific investigation is an investigation that is done in the field of science. This unravels the secrets of the earth and the logical reason behind the things happening.

There are three types of scientific investigations. They are descriptive investigation, comparative investigation, and experimental investigation. When we see a thing happening in the environment or anywhere, always find a reason behind it.

The steps in completing a scientific investigation are:

Thus, the scientific investigations must be well relevant to the data.

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During the formation of a coordination compound, ligands act as:

A) Lewis bases.

Ligands are molecules or ions that bind to a central metal ion or atom in a coordination complex. They typically have one or more lone pairs of electrons available for donation. In this context, ligands are considered Lewis bases because they donate electron pairs to the central metal ion or atom. The central metal ion or atom, in turn, acts as a Lewis acid by accepting electron pairs from the ligands to form coordination bonds.

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The problem is solved by balancing the reaction equation as shown below. The stoichiometry of the reaction is now applied in solving the question.

The balanced reaction equation is:

SiO2 + 6HF → H2[SiF6] + 2H2O

Using stoichiometry

The amount of silicon dioxide reacted = 12.5 g/60.08 g/mol = 0.21 mole

1 mole SiO2 yields 2 moles of H2O

0.21 mole of SiO2 yields 0.21 * 2/1 = 0.42 moles of H2O

The amount of HF reacted = 24.6 g/20.01 g/mol = 1.23 moles of HF

6 moles of HF yield 2 mole of H2O

1.23 moles of HF yields 2 * 1.23/6 = 0.41 moles of H2O

Hence HF is the limiting reactant.

Theoretical yield of H2O = 0.41 moles of H2O * 18 g/mol = 7.38 g

The percentage yield of the water is = actual yield/theoretical yield * 100

Hence;

% yield = 2.50 g/7.38 g * 100 = 33.9%

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

volume = 55 mL

density = 1.26 g/mL

mass = 1.26 × 55 = 69.3 g

We have the final answer as

Hope this helps you

Answer:

they explain the properties and structure of the compound which empirical molecular formulars cannot explain

The structural formulas are good for depicting polymers because polymers are the chemical compounds attached to the long chain with ac other which is impossible to represent other than the structural formula.

The structural formulas are the graphic representation or diagrammatical representation of the structure of any chemical formula in organic and inorganic chemistry they are mostly used.

In Polymers, they are long chains of chemicals compound can be shown diagrammatically or graphically to understand the attachment t of the bonds within them which signifies the physical properties too.

Therefore, polymers are the chemical compounds attached to the long chain with ac other which is impossible to represent other than the structural formula which is why structural formulas are good for depicting polymers.

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Amino Acids is your answer

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

Answer:

1.Physical change

2. Chemical change

3. Heat

4.photosynthesis

5. composition

The element's Atomic number , which has 5 protons, 6 neutrons, and 2 electrons (the atomic number is the number of protons) =  5

the number assigned to a chemical element according to its atomic number in the periodic system, which places the elements in ascending order of the number of protons in their nuclei. As a result, the atomic number is also the number of protons, which in a neutral atom is always equal to the amount of electrons.

Protons and neutrons are added to determine an element's mass number. The only number that may change while maintaining the identity of an element is the number of neutrons for that element (because the atomic number is the number of protons).

Mass number = protons + neutrons

Given:

5 protons,

6 neutrons

2 electrons

Atomic number = ?

We know that the Mass number = protons + neutrons:

Mass number = protons + neutrons

Mass number = 5 + 6:

Mass number = 11

The element's Atomic number , which has 5 protons, 6 neutrons, and 2 electrons (the atomic number is the number of protons) =  5.

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Answer:

The concentration of the \(\rm Ca^{2+}\) ions in the solution would continue to be \(4.90 \times 10^{-3}\; \rm M\) provided that the temperature the solution stays the same.

Explanation:

Normally, evaporating the solvent (e.g., water) from a dilute salt solution would increase the concentration. However, in most cases, there is a limit on the maximum concentration of that solution. One would expect the solute (the salt) to precipitate out of the solution when the solution is saturated with this solute.

However, if the salt solution is saturated to begin with, the solute would start to deposit out of the solution immediately after evaporation starts. If the temperature of the solution stays the same, concentration won't increase at all.

The question states that the calcium sulfate solution in this question is saturated to begin with. Thus, the initial concentration of the saturated solution (\(4.90 \times 10^{-3}\; \rm M\)) would be the maximum concentration that this solution could achieve at this temperature. If temperature stays unchanged, evaporating water out of the solution would deposit calcium sulfate out of the solution; the concentration of the solute would continue to be \(4.90 \times 10^{-3}\; \rm M\!\).

The concentration of \(\rm Ca^{2+}\) in this solution is directly proportional to the concentration of \(\rm CaSO_{4}\) in the solution.

Thus, the concentration of \(\rm Ca^{2+}\) in this solution would not change and continue to be \(4.90 \times 10^{-3}\; \rm M\!\).

Answer:

There would be 3 temperature changes and 2 phase transitions

Explanation:

The temperature of the material would first increase from T0 to Tm (its melting point)- This is one temperature change.

It would the change from solid to liquid at its melting point Tm.- This is one phase transition.

Its temperature would then increase from its melting point Tm to its boiling point Tv -This is another temperature change.

It would then change from liquid to gas at its boiling point Tv - This is another phase transition.

Finally, its temperature would then increase from its boiling point to T(f) - This is the third temperature change.

So, there would be 3 temperature changes and 2 phase transitions

Substance C would not act as an acid or a base according to the Bronsted-Lowry definition.

In a chemical process, an acid contributes a proton (H+), whereas a base absorbs a proton, according to the Bronsted-Lowry definition. The tasteless substance C does not display the characteristics of an acid or a basic. It is unable to take part in Bronsted-Lowry acid-base reactions because it neither donates nor accepts protons.

According to the Bronsted-Lowry definition, substances A, B, and D can act as acids or bases if they have acidic or basic properties such a sour or bitter taste, are reactive with metals, or can react with other acids or bases. Thus, Substance C would not act as an acid or a base according to the Bronsted-Lowry definition.

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The study by Moreau-Luchaire et al. (2016) explores the additive interfacial chiral interaction in multilayers for stabilizing small individual skyrmions at room temperature.

The additive interfacial chiral interaction plays a crucial role in stabilizing small individual skyrmions at room temperature. Skyrmions are nanoscale magnetic whirls with unique topological properties, making them potential candidates for information storage and spintronic devices. However, maintaining the stability of these skyrmions is a challenge, especially at ambient conditions.

The research conducted by Moreau-Luchaire and colleagues investigates the effect of the interfacial chiral interaction in multilayer systems. They demonstrate that by carefully designing the multilayer structure, the chiral interaction can be enhanced, leading to the stabilization of small individual skyrmions at room temperature. This is a significant achievement as it opens up possibilities for practical applications of skyrmions in technology.

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Answer:

712 moles of Hg are produced

Explanation:

Based on the reaction:

2HgO → 2Hg + O₂

Where 2 moles of HgO reacts producing 2 moles of Hg and 1 mole of O₂

To solve this question we need to find the moles of Hg produced, then, using its molar mass:

Moles Hg:

3.55mol HgO * (2 mol Hg / 2 mol HgO) = 3.55 mol Hg

Grams -Molar mass Hg: 200.59g/mol-:

3.55mol Hg * (200.59g/mol) =

712 moles of Hg are produced

Answer:

Assuming that the butter is already a liquid, it is a chemical change in which the milk solids of the butter oxidize.

Explanation:

I hope this helps :)

Chemical changes have occurred as the stick of butter melts as the milk solids present in butter undergo oxidation resulting in formation of new substances.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

a: graphite.

Explanation:

According to the forces of attraction, graphite has  weak dispersion forces in between layers.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

A mixture is created when two or more different substances are physically combined and can be separated back into its original substances. A chemical reaction occurs when two or more substances are combined to form a new substance and cannot be separated back into its original substances.

Explanation:

Answer:

A mixture is created when two or more different substances are physically combined and can be separated back into its original substances.

Explanation:

Hope it helps

The application of 234Th to determine particle fluxes in the ocean is known as the Thorium method.

In this method, the measurement of the decay rate of 234Th (half-life of 24.1 days) is used to determine the amount of sinking particles.

The 234Th is introduced into the surface ocean by decay of 238U. The dissolved 234Th is quickly adsorbed onto sinking particles and carried to the deep ocean with the settling particles.Because the decay rate of 234Th is faster than the sinking rate of particles, the excess of 234Th is found in the water column below the production zone.

The Thorium method determines the sinking rate of particles by measuring the excess of 234Th in the water column. It is a useful method to measure particle fluxes in the ocean as the Thorium method offers high resolution and can be used over a wide range of ocean environments.

Thus, this application is known as Thorium method.

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Answer:

To find the pressure of the dry hydrogen gas alone, we need to subtract the pressure exerted by the water vapor from the total pressure of the mixture.

First, we need to convert the vapor pressure of water from mmHg to kPa:

11.9 mmHg x (1 kPa / 7.5006 mmHg) = 0.0159 kPa

Next, we need to subtract this value from the total pressure of the mixture:

113.0 kPa - 0.0159 kPa = 112.9841 kPa

Therefore, the pressure exerted by the dry hydrogen gas alone is 112.9841 kPa.

Explanation:

Answer: A. The wall push back on the ball with more force, which causes the return speed of the to increase.

Explanation: For every for exerted on an object, there is an equal force exerted in the opposite direction. When the ball hits the wall with more force, the wall pushes back on the ball with more force. This causes the return speed of the ball to increase. The force that the wall applies to the ball launches the ball in the opposite direction. The greater the force on the ball, the greater it’s speed becomes .

Answer: The wall pushes back on the ball with more force, which causes the return speed of the ball to increase.

Explanation: Correct on Study Island

The correct statement(s) about the process of boiling a pot of tap water are:

a. The water's change of state requires an increase in energy.

d. The water is undergoing evaporation.

When water is heated until it reaches its boiling point, it goes through a change of state from a liquid to a gas (water vapor), requiring an increase in energy. The intermolecular interactions binding the water molecules together must be broken during this phase change in order for them to escape into the gas phase.

d. The water is evaporating: Boiling is a particular kind of evaporation that takes place when a liquid's vapor pressure exceeds atmospheric pressure. Enough energy is gained by the water molecules at the surface to overcome intermolecular interactions and escape into the gas phase. Evaporation is the mechanism by which liquid water becomes water, and it takes place over time.

b. The assertion that "The water is undergoing sublimation" is untrue. Without transitioning via the liquid phase, the term "sublimation" describes the immediate change of state from a solid to a gas. Not from a solid to a gas, but from a liquid to a gas precisely, is what happens when something boils.

b. The assertion that "The water's change of state involves a loss of energy to the surroundings" is false. Water must be brought to a boil, not lost to the environment as energy. The heat energy given to the water raises its kinetic energy, enabling the molecules to defy intermolecular interactions and enter the gas phase.

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Answer:

\({ \bf{from \: ionic \: product \: of \: water : }} \\ { \boxed{ \tt{k _{w} = [H _{3} O {}^{ + } ][OH {}^{ - } ]}}} \\ \\ { \tt{1 \times {10}^{ - 14} = (1 \times {10}^{ - 5} ) [OH {}^{ - } ]}} \\ \\ { \tt{[OH {}^{ - } ] = 1 \times {10}^{ - 9} }} \: M\)

A solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.

The water is made up of H2O only and when the pH of it is 7 then the concentration of all the ions would be the same while dissociation the water will get dissociate into H+ ions and OH- ions.

The concentration of OH- ions will be

OH- = Kw {H3O+}

{H3O+} = 1 × 10−5 M.

Kw = 14

substituting the value in the equation,

OH = 14 { 1 × 10−5 M.}

OH = 1 × 10−9 M

Therefore, the solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.

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The hard/soft acid/base (HSAB) theory states that hard acids have a greater affinity for hard bases, while soft acids have a greater affinity for soft bases. According to the HSAB theory,

(a) CaF2(s) + CdI2(s) → CaI2(s) + CdF2(s) will occur, while

(b) Cr(CN)2(s) + Cd(OH)2(s) → Cd(CN)2(s) + Cr(OH)2(s) will also occur.

(a) In this reaction, we have Ca2+ and Cd2+ cations as the acid centers and F- and I- anions as the base centers. Ca2+ and Cd2+ are both hard acids, while F- and I- are both soft bases. According to HSAB theory, hard acids prefer to interact with hard bases, and soft acids prefer to interact with soft bases. Therefore, Ca2+ and F- will tend to form a compound, and Cd2+ and I- will tend to form a compound. Thus, the reaction is predicted to occur as follows:

CaF2(s) + CdI2(s) → CaI2(s) + CdF2(s)

(b) In this reaction, we have Cr2+ and Cd2+ cations as the acid centers and CN- and OH- anions as the base centers. Cr2+ is a hard acid, while Cd2+ is a borderline acid. CN- is a soft base, while OH- is a borderline base. According to HSAB theory, hard acids prefer to interact with hard bases, and soft acids prefer to interact with soft bases. Therefore, Cr2+ and CN- will tend to form a compound, and Cd2+ and OH- will tend to form a compound. Thus, the reaction is predicted to occur as follows:

Cr(CN)2(s) + Cd(OH)2(s) → Cd(CN)2(s) + Cr(OH)2(s)

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According to the hard/soft acid/base concept, hard acids prefer to bond to hard bases, while soft acids prefer to bond to soft bases. Based on this concept, we can predict whether the following reactions will occur:

(a) CaF2(s) + CdI2(s) → CaI2(s) + CdF2(s)

Calcium ion (Ca2+) and fluoride ion (F-) are hard acids, while cadmium ion (Cd2+) and iodide ion (I-) are soft bases. Therefore, Ca2+ and F- will tend to form a compound together, and Cd2+ and I- will tend to form a compound together. Thus, the reaction is expected to occur.

(b) Cr(CN)2(s) + Cd(OH)2(s) → Cd(CN)2(s) + Cr(OH)2(s)

Chromium ion (Cr2+) and cyanide ion (CN-) are soft acids, while cadmium ion (Cd2+) and hydroxide ion (OH-) are hard bases. Therefore, Cr2+ and CN- will tend to form a compound together, and Cd2+ and OH- will tend to form a compound together. Thus, the reaction is not expected to occur.

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Answer:

Salts that produce acidic solutions are acid salts. Neutral salts are those salts that are neither acidic nor basic. Zwitterions contain an anionic and a cationic centre in the same molecule, but are not considered to be salts. Examples of zwitterions include amino acids, many metabolites, peptides, and proteins.

Explanation:

When carbonic acid decomposes, water and carbon dioxide are formed. The balanced chemical equation for the reaction can be represented as follows:Carbonic acid is a weak inorganic acid that forms when carbon dioxide is dissolved in water.

Carbonic acid is also present in fizzy drinks and soda water. When carbonic acid decomposes, water and carbon dioxide are formed.The balanced chemical equation for the decomposition reaction of carbonic acid can be represented as:H2CO3 → H2O + CO2The above reaction is an example of a decomposition reaction, which means that a single compound breaks down into two or more simpler substances.

Here, carbonic acid, which is a compound, breaks down into water and carbon dioxide gas.Balancing chemical equations is an important concept in chemistry that is used to describe chemical reactions. It involves the use of coefficients to balance the number of atoms of each element on both sides of the equation. The coefficients are the smallest possible integers that ensure that the law of conservation of mass is obeyed.

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