Calcium is involved in all of the following functions except:
a. Calcium provides energy for cells.
b. Calcium deposits into bones and teeth to provide a rigid structure.
c. Calcium is necessary for blood clotting.
d. Calcium is necessary for muscle contraction and relaxation.
e. Calcium is necessary for nerve functioning.

The maximum wavelength of light for which a carbon iodine single bond could be broken by absorbing a single photon is 503 nm

Energy per mole EA = NA . he/ λ

= λ= NaHe/EA

= (6-023 x 1023 mol-1) x (60626 x 10-3495) x (378108 ms-1)/(238 x 103 J mol-1)

= 0.503x10-6 m

= 503x10-9m

= 503 nm

[  λ= wavelength ]

[ NA= Avagrado's Number ]

The wavelengths of the visible mild range between 400-700 nanometers, that is among the infrared having longer wavelengths and the ultraviolet having shorter wavelengths. The wavelength of the visible mild suggests that its frequency is about 430-750 terahertz (THz).

The wavelength of light is the space between corresponding factors in two adjoining mild cycles, and the frequency of mild is the quantity of cycles of mild that skip a given factor in a single second.

A single wavelength is much less than 1.2 meters; it could be observed with the aid of dividing 1.2 meters by means of 1.5. The wavelength of the third harmonic is 0.8 meters.

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Answer:

The energy used in melting is heat energy.

If the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂ solution is 3.11, then the statement which is correct is [HCHO₂] > [NaCHO₂].

Buffer solution is a solution which is a mixture of weak acid and its conjugate base or vice a versa. It shows a very little change in pH when strong acid or base is added in it.

Since NaCHO₂ is a basic salt of formic acid and it acts as a buffer solution. The pH of buffer solution is calculated by the formula

pH=pKa+log([base]/[acid])

We know that HCHO₂ is an acid, where NaCHO₂ is a base. Plug all values in the formula

3.11=3.74+log([NaCHO₂]/[HCHO₂])

3.11-3.74=log([NaCHO₂]/[HCHO₂])

log([NaCHO₂]/[HCHO₂])=-0.63

Take antilog on both side

[NaCHO₂]/[HCHO₂]=10^(-0.63)

[NaCHO₂]/[HCHO₂]=0.234423

Multiply both side by [HCHO₂]

([NaCHO₂]/[HCHO₂])×[HCHO₂]=0.234423×[HCHO₂]

[NaCHO₂]=0.234423×[HCHO₂]

From the above calculation, it is observed that concentration of NaCHO₂ is less than the concentration of HCHO₂. Hence, [HCHO₂] > [NaCHO₂].

Therefore, if the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂ solution is 3.11, then the statement which is correct is [HCHO₂] > [NaCHO₂]. Hence, 'option d' is correct.

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Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most atom, that is better than no electron delocalization at all this is false.

The electron delocalization stabilizes the electron so it is necessary to have electron delocalization. the electron delocalize because it spreads the energy over the large area. the electrons present are the charges which brings the extras stability.

Thus, Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most atom, that is better than no electron delocalization at all this is false.

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Cryolite, which also has a relatively low melting point, is used as an electrolyte because, among other things, it dissolves alumina well, conducts electricity, dissociates electrolytically at a higher voltage than alumina, and has a lower density than aluminum at the temperatures needed for the electrolysis.

At 950 °C (1,750 °F), a nearly pure aluminum oxide compound called alumina is dissolved in a molten electrolyte made of aluminum, sodium, and fluorine. This electrolyte is then electrolyzed to produce aluminum metal at the cathode and oxygen gas at the anode.

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The molarity of the solution is 0.36 mol/L. The molality of the solution is 0.34 m. The mass percent of the solution is   3.33%.

KNO3's molecular weight is 72.5 g/101 g/mol, or 0.72 moles, in terms of mass/molar mass.

Molarity is defined as the product of the number of moles and the volume, or 0.72 moles/2.00 L or 0.36 mol/L.

Number of moles of solute divided by kilograms of solution equals the molality.

mass of solution = 1.05 g/mL x 2000 mL = 21000 g or 2.1Kg

Molality of solution equals 0.72 moles/2.1 kg, or 0.34 m.

Mass percent of solution = mass of solute/mass of solution divided by 100.

The mass percent of the solution is equal to 72.5 g/ (72.5 g + 2100 g) 100/1 = 3.33%.

The volume of a material present in a given volume of solution is known as its molarity (M). The number of moles of a solute in a liter of solution is referred to as molarity.

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Statements that describe the reaction of water with an alkyne in the presence of an acid catalyst include :

* The ketone form of the product is more stable than the enol form.

* The initial product of the reaction is an enol.

* The enol tautomerizes to form a ketone.

* HgSO4 is used as an additional catalyst in this reaction.

A catalyst is a substance that accelerates a chemical response or lowers the temperature or pressure needed to begin one, without itself being consumed in the course of the reaction.

Catalysts speed up a chemical reaction by means of reducing the amount of power you need to get one going. Catalysis is the backbone of many business tactics, which use chemical reactions to turn raw materials into beneficial products.

Catalysts may be labeled as homogeneous, heterogeneous, or enzymatic. Homogeneous catalysts exist within the identical phase because of the reactants, whereas heterogeneous catalysts exist in a specific phase than the reactants.

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The product obtained by multiplying the atomic mass of carbon-13 by its abundance is 0.144

Isotopes is a term used in chemistry that can be described as members of a family of an element that have the same number of protons but differ in the number of neutrons

Carbon-13 is a stable carbon isotope whose nucleus consists of six protons and seven neutrons.

Since the mass of Carbon-13 is 13.003 amu and its abundance in nature is 1.109%, we can calculate the product of these as follows;

First, we convert the abundance percentage into a decimal value as follows;

1.109% = 1.109 ÷ 100 = 0.01109

Now;

mass × abundance =  13.003 × 0.01109

mass × abundance = 0.14420327

Now converting it to 3 significant digits;

mass × abundance = 0.144

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sanitizer solution measured if it reads between 100 and 400 ppm, the concentration is adequate.

Sanitizers based on iodine: Dip the strip for 60 seconds in the sanitizing solution, then remove and compare to the colour chart. If it reads between 12.5 and 25 ppm, the concentration is adequate.The two most common field measurement methods are test strips and titration kits, but following manufacturer instructions and understanding the limitations of any method is critical when interpreting results. A test strip is used to determine the concentration of sanitizer in parts per million (ppm). Three of the test sections on the six-in-one test strip are related to sanitizer level. Total bromine, total chlorine.

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the food worker label chicken salad as three days old according to the example given below.

In this case, the food worker should label the food as three days old. This is because food in the food industry must be labelled with the date of the oldest cooked ingredient. It would be the chicken in this case. When foods are unfrozen or cooked, microorganisms begin to grow on the surface and enzyme activity increases. This accelerates the rate at which the food spoils. According to the CDC, chicken is safe to eat up to four days after it has been cooked.

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CuCl₂₍aq₎ + 2KOH₍aq₎ ⇒ Cu(OH)₂₍s₎ + 2 KCl₍aq₎

Above reaction is an example of precipitation reaction, in which Cu(OH)₂ is the formed precipitate.

In aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is the precipitate.

Precipitation reactions are usually double displacement reactions involving the productions of a solid form residue. Precipitate is formed when cations and anions in aqueous solution combine.

CuCl₂ : Its appearance is yellow-brown solid

KOH : Potassium hydroxide, its appearance is  white solid deliquescent, etc,.

Cu (OH)₂ : Its appearance is blue or blue-green solid

KCl : potassium chloride and sylvite , its appearance is white crystalline solid and colorless hygroscopic crystals.

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When two or more substances are mixed together but not chemically combined, the result is a colloid ( they can be separated ).

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The number of atoms of k40 decaying per second will be 0.133  × 10⁸

First, we need to convert the 1.6× 10⁻⁶ g of sample into number of atoms of potassium and to convert the activity into numbers of atoms that decay per second.

( 1.6 ×10⁻⁶  g K-40)(1 mol K/ 39.9 g)(6.022 x 10²³ atoms K-40/mol) =

=0.241 × 10¹⁷

We can then use the first-order rate equation to find  rate constant, k

k = 4.1 x 10-9 s-1

t1/2= 0.693/k

t1/2= 0.693/ k

k= 0.693/t1/2

k= 0.693/1.28 × 10⁹

k= 0.5414 × 10⁻⁹ /sec

No of atoms decaying/sec = k [0.241× 10¹⁷  atoms]

= 0.5414 × 10⁻⁹ × 0.241× 10¹⁷

= 0.130 × 10⁸

So, the number of atoms decaying per second will be 0.133  × 10⁸ .

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Ignoring the effects of recoil, the minimum energy must the photon have for this reaction to occur is 10 MeV

The nuclear reaction is (28,14)Si+ γ---(24,12)Si+He(2,4)

The binding energy that holds the nuclide is

E=Δmc^2

where Δm is the mass defect

Δm=27.976927+0-[23.985042+4.002602]

Δm=-0.010717x1.66054x10^-27 kg

So the minimum energy of photon should be

ΔE=Δmc^2=0.017796x10^-27x(3x10^8)^2/1.6x10^-19 V

ΔE= 10 MeV

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Similar to the ball-and-stick model, this graphic or physical representation of a molecule shows the atoms as partial spheres with diameters proportional to the real atoms.

Because they display how much room an atom (or molecule) takes up, space-filling models are helpful. Comparing spatially models with conventional ball-and-stick models, such those in the following graphic, makes this point clear. The latter do not even remotely convey a feeling of molecular size.

The overlapping regions of the spheres in a room model represent the locations were chemical bonds are created in molecules whenever electrons are shared. In order to explain the relationships between the atoms within a molecule, scientists also employ ball-and-stick models.

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The coordination geometry of an octahedron is determined by the number of atoms or ions that are bonded to the central atom. In the case of chromium(III) chloride crystals, the chromium atom is surrounded by six chloride ions, which gives it an octahedral coordination geometry.

However, the ratio of chromium to chlorine in the formula of chromium(III) chloride, CrCl3, is not 1:6. The formula indicates that there is one chromium atom for every three chlorine atoms, which would not produce an octahedral coordination geometry if the atoms were bonded directly to each other.

One possible explanation for this discrepancy is that the chromium and chlorine atoms are not bonded directly to each other in the crystal structure.

Instead, the chromium atom may be surrounded by a group of six chloride ions that are bonded to each other, forming an octahedron. This would allow the coordination geometry of the chromium atom to be octahedral even though the ratio of chromium to chlorine atoms in the formula is not 1:6.

Alternatively, the chromium and chlorine atoms may be bonded to each other through intermediate atoms or ions, such as water molecules.

In this case, the coordination geometry of the chromium atom would still be octahedral because it would be bonded to six chlorine atoms, even though the overall ratio of chromium to chlorine atoms in the formula would not be 1:6.

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The 0.16 moles of o2 are needed for to complete this reaction.

What is mole?

The term "mole" refers to the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilograms of carbon 12.

What is acetylene?

The simplest alkyne chemical, often known as acetylene. Ethyne, narceine, and vinylene are other names for acetylene. It is widely utilised as a fuel and a component of chemical compounds. It is treated as a solution even though it is unstable in its pure state.

2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)

A)  2 moles C2H2  require  5 moles O2

3.0 moles C2H2 require 3.0 x 5 / 2 = 7.5 moles O2

moles of O2 required = 7.5

B) 2 moles C2H2  produce  4 moles CO2

3.2 moles CH2  produce  3.2 x 4 / 2 = 6.4

moles of CO2 produced = 6.4

C) 2 moles H2O require  2 moles C2H2

0.58 moles H2O  require 0.58 x 2 / 2 = 0.58 moles C2H2

moles C2H2 require  = 0.58

D) 5 moles O2 produce 4 moles CO2

0.20 moles O2 produce 0.20 x 4 / 5 = 0.16

moles CO2 produced = 0.16

Therefore, 0.16 moles of o2 are needed for to complete this reaction.

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The 5 steps to prevent a fire are

These are actions and procedures designed to prevent and put out destructive fires. Anywhere a fire can start, so it's critical to always be prepared for what to do if one breaks out inside your house. Likewise, it's equally crucial to consider all of the ways in which you can stop one from occurring in the first place.

Hence, simple step of fire prevention works on minor levels.

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The permissive temperature is 20°C, and the restrictive temperature is 26°C if a mutation has an obvious effect at 26°C but not at 20°C.

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Fluorine and Nitrogen are both non-metals which posses non polar covalent bonds.  So in this case, only KCl has polar covalent bond.

Before solving, let us understand the meaning of covalent and ionic bonds and how to identify them.

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.

Therefore, the polar covalent bond is shown by KCl as it shows sharing of equal electrons amongst them.

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Your thermometer must be washed with soapy water, rinsed, and sanitized every four hours. A clean wiping cloth from your sanitizer bucket or a personal alcohol wipe should be used to clean food thermometers between applications.

To help prevent the cross-contamination of germs, home cooks should clean their food thermometers after each use. A thorough post-use clean will also get rid of any dirt and food residue on your thermometer, which could be preventing you from getting an accurate reading of the internal temperature of your food.

Hence, food thermometer should be cleaned after every individual testing's

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The reaction between AgNO₃ and NaCl forms AgCl and NaNO₃. The balanced chemical equation for the above reaction is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

The reaction between AgNO₃ and NaCl is both precipitation and double-displacement reaction. The balanced chemical equation is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

                                          (ppt)

In a double displacement reaction the anions are exchanged and the more reactive element displaces the less reactive element. And in a precipitation reaction, a precipitate is formed in the end of the reaction. In this reaction, AgCl is formed as precipitate.

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The reaction between 1 mole of oxygen gas and 1 mole of ethanol has oxygen gas (O2) as the limiting reactant.

equilibrium equation

2CO2 + 3H2O > CH3CH2OH + 3O2

Three moles of oxygen (O2) and one mole of CH3CH2OH (from the previous equation) interacted.

Three moles of O2 and one mole of CH3CH2OH reacted from the above balanced equation.

As a result, 1 mole of O2 will react with 0.33 moles of CH3CH2OH (1/3)

From the preceding calculation, we can see that just 0.33 moles of the given 1 mole of CH3CH2OH are required for a complete reaction with 1 mole of O2.

O2 is the limiting reactant as a result.

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The complete question is

CH3CH2OH + 302 → 2002 + 3H20

What would be the limiting reactant in the reaction if 1 mole of

oxygen gas and 1 mole of ethanol (CH3CH2OH) reacted with

each other?

Fourth naturally occurring isotope of sulfur is sulfur-36. The average atomic mass of Sulfur is 32.066 amu.

Natural abundance of isotopes of sulfur is:

sulfur-32 is 95.0%

sulfur-33 is 0.76%,

sulfur-34 is 3.22%

sulfur-36 is 0.89%

The average atomic mass of an element is defined as the total of atomic mass of an isotope multiplied by its natural abundance. Atomic mass of sulfur can be found as

Average Atomic Mass = (Atomic mass of S-32 * Abundance of S-32) + (Atomic mass of S-33 * Abundance of S-33) + (Atomic mass of S-34 * Abundance of S-34) + (Atomic mass of S-36 * Abundance of S-36)

Average Atomic Mass = (32amu × 0.95) +(33amu × 0.0076) + (34amu × 0.0322) +(36amu × 0.0089)

Average Atomic Mass = (30.4amu) + (0.2508amu) + (1.0948amu) + (0.3204amu)

Average Atomic Mass = 32.066 amu

Your question is incomplete but most probably your full question was;

Sulfur has 4 isotopes: sulfur-32 is 95.0%, sulfur-33 is 0.76%, sulfur-34 is 3.22%, and sulfur-36 is 0.89% abundant. calculate its average atomic mass. express your answer with five sig figs.

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Usually, an increased or normal anion gap metabolic acidosis results from too much acid and/or too little base.

In patients with acidosis, lactic acidosis, diabetic ketoacidosis, uremic acidosis, ethylene glycol poisoning, and laboratory mistake are the most frequent causes of an elevated anion gap.

The anion gap quantifies the space between your blood's positively and negatively charged electrolytes. Your blood is more acidic than usual if the anion gap is too high. If the anion gap is too small, your blood's acidity is insufficient.

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Small mount of activated charcoal in final product does not affect the melting point of the compound because some compound has high impurity weight.

The activated charcoal can remove impurities in the gaseous and iquid state from many solutions. By the process of adsorption the activated charcoal attracts these molecules to the surface of the charcoal. A small amount of impurities left from the charcoal used in some step. It does not affect the melting point of the compound because some compound has high impurity weight.

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In a thermochemical equation, the reactants' and products' physical states must be taken into account because they affect the value of H. In the course of an endothermic reaction, the environment provides energy.

H2 (g) + ½ O2 (g) → H2O (l); ΔH = -285.8 kJ

HgO (s) → Hg (l) + ½ O2 (g); ΔH = +90.7 kJ

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Ethylene glycol and terephthalic acid undergo condensation polymerisation with the elimination of water (H20) molecule. Elimination of water forms ester bond between these two molecule.

Dacron or terylene is a type of polyester. Which is formed by the condensation polymerization. Ethylene glycol and terephthalic acid undergo condensation polymerisation with the elimination of water (H20) molecule. Elimination of water forms ester bond between these two molecule.

Since, terephthalic acid contains -COOH (acidic group) and ethylene glycol contains -OH (alcoholic group).

The reaction takes place at a temperature range of 420 - 460 K. This reaction occur in presence of zinc acetate and antimony trioxide as a catalyst.

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