what is the formula for magnetite?​

The molar solubility of AgCl:

The molar solubility of AgCl in a 0.050 M NaCl solution is 8 x [tex]10^{-8}[/tex] M [tex]Ag^{+}[/tex]

What is solubility?

The solubility is the quantity of reagent required to saturate the solution or bring about the dissociation reaction's equilibrium.

Reaction:

The dissociation reaction of AgCl in water is:

[tex]AgCl[/tex]  ⇄ [tex]Ag^{+} + Cl^{-}[/tex]

Each mole of AgCl that dissolves in this reaction yields 1 mole of both [tex]Ag^{+}[/tex] and  [tex]Cl^{-}[/tex]. The concentration of either the Ag or Cl ions would then be equal to the solubility.

Solubility= [[tex]Ag^{+}[/tex]] = [[tex]Cl^{-}[/tex]]

Calculation:

in 0.050 M NaCl, the [[tex]Cl^{-}[/tex]] = 1 x [tex]10^{-2}[/tex]

ksp = [[tex]Ag^{+}[/tex]] x [[tex]Cl^{-}[/tex]]

1.6 x [tex]10^{-10}[/tex] = [[tex]Ag{+}[/tex]] x ( 5 x [tex]10^{-2}[/tex])

[[tex]Ag^{+}[/tex]] = 5 x [tex]10^{+2}[/tex] x 1.6 x [tex]10^{-10}[/tex]

[[tex]Ag^{+}[/tex]] = 5 x 1.6 x [tex]10^{-10+2}[/tex]

[[tex]Ag^{+}[/tex]] = 8 x [tex]10^{-8}[/tex] M

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A wavy pattern of dark and light bands on the bottom of a pond is caused by refraction of light waves through a rough surface; option D.

Destructive interference occur when two waves come in contact with each other and cancel each other out.

Reflection and refraction of light waves can result in destructive interference. An example of destructive interference due to refraction of light is a wavy pattern of dark and light bands on the bottom of a pond.

In conclusion, destructive interference occurs when waves cancel each other out.

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The answer to the question is D.

Answer:

10.2 °C

Explanation:

If all other variables are held constant, you can find the new temperature using the Charles' Law equation. The equation looks like this:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can find the new temperature by plugging the given values into the equation and simplifying.

V₁ = 122 mL                     V₂ = 50 mL

T₁ = 25 °C                        T₂ = ? °C

V₁ / T₁ = V₂ / T₂                                         <----- Charles' Law equation

122 mL / 25 °C = 50 mL / T₂                    <----- Insert values

4.88 = 50 mL / T₂                                     <----- Divide 25 from 122

4.88 x T₂ = 50 mL                                    <----- Multiply both sides by T₂

T₂ = 10.2 °C                                             <----- Divide both sides by 4.88

The rate of reaction at 150 degrees is 1.878.

We have the formula as;

ln(k2/k1) = Ea/R (1/T1 - 1/T2)

ln(2( 0.0110)/0.0110) = 45.5  * 10^3/8.314(1/294 - 1/T2)

0.693 = 5473(1/294 - 1/T2)

0.693/ 5473 = (1/294 - 1/T2)

1.27 * 10^-4 = 1/294

1/T2 = 1/294  - 1.27 * 10^-4

1/T2 = 340 * 10^-4 - 1.27 * 10^-4

T2 = 30 degrees

Again;

ln(k2/0.0110) =  45.5  * 10^3/8.314(1/303 - 1/423)

ln(k2/0.0110) = 5473(3.3 * 10^3 - 2.36  * 10^3)

ln(k2/0.0110) = 5.14

k2/0.0110 = e^5.14

k2 = 0.0110 * e^5.14

k2 = 1.878

The temperature that the reaction will go twice as fast is 30 degrees while the rate construction at 150 degrees is 1.878.

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A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases. The total pressure in the tank is 2710 torr. The pressure exerted by the nitrogen and oxygen is 930 and 850 torr, respectively.  27.1 torr is the partial pressure of the carbon dioxide in the mixture.

Dalton's Law of partial pressure states that the total pressure exerted by non reacting gaseous mixture at a constant temperature and given volume is equal to the sum of partial pressure of all gases.

It is expressed as:

[tex]P_{A} = X_{A} P_{T}[/tex]

where,

[tex]P_{A}[/tex] = Partial pressure of gas A

[tex]X_{A}[/tex] = Mole fraction of gas A

[tex]P_{T}[/tex] = Total pressure

Mole Fraction of Nitrogen

= [tex]\frac{930}{930 + 850}[/tex]

= 0.52

Mole Fraction of Oxygen

= [tex]\frac{850}{850 + 930}[/tex]

= 0.47

Now,

Mole fraction of nitrogen + Mole fraction of oxygen + Mole fraction of carbon dioxide = 1

⇒ 0.52 + 0.47 + Mole fraction of carbon dioxide = 1

⇒ 0.99 + Mole fraction of carbon dioxide = 1

⇒ Mole fraction of carbon dioxide = 1 - 0.99

⇒ Mole fraction of carbon dioxide = 0.01

Now put the value in above expression we get

[tex]P_{A} = X_{A} P_{T}[/tex]

     = 0.01 × 2710

     = 27.1 torr

Thus from the above conclusion we can say that A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases. The total pressure in the tank is 2710 torr. The pressure exerted by the nitrogen and oxygen is 930 and 850 torr, respectively.  27.1 torr is the partial pressure of the carbon dioxide in the mixture.

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molar mass of sucrose is 342 g/mol.

Concept:

It is the substance's molecular mass. M is the abbreviation for it, and g/mol is the standard unit for measuring molar mass.

Given:

Sucrose (C12H22O11)

Find:

Calculate the molar mass of the powdered fruit drink mix, made from sucrose (C12H22O11).

Solution:

The molar mass of carbon = 12 g/mol

The molar mass of hydrogen = 1 g/mol

The molar mass of oxygen = 16 g/mol

Thus, the molar mass of sucrose can be calculated as:

C12H22O11 12 C + 22 H + 11 O

= 12 12 g/mol + 22 * 1 g/mol + 11 * 16 g/mol

= 144 g/mol + 22 g/mol + 176 g/mol = 342 g/mol

Therefore, the molar mass of sucrose is 342 g/mol.

Hence, the molar mass of the powdered fruit drink mix, made from sucrose

Hence, the molar mass of the powdered fruit drink mix, made from sucrose(C12H22O11) is 342 g/mol.

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The reaction is completed by the equation below: [tex]3H_2 + N_2 --- > 2NH_3[/tex]

They are chemical reactions in which two or more molecules react to produce a single product.

In this case, the synthesis reaction is that of ammonia. Molecules of hydrogen gas and nitrogen gas combine to produce ammonia.

The equation of the reaction is as follows: [tex]3H_2 + N_2 --- > 2NH_3[/tex]

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The total mass of the reactants equals the total mass of the products

Answer:

B.)  in front of the formula of a reactant or product.

Explanation:

Coefficients modify the amount of a particular molecule. As such, they are placed directly in front of the molecule's formula.

The total percent yield:

After the combustion reaction with methane, the percent yield was 66.7%.  

Combustion of Methane:

The other reactant, air's excess oxygen, is always present, making methane the limiting reactant. As a result, the amount of CH₄ burned will determine how much CO₂ and H₂O are produced.

The following chemical process produces carbon dioxide from methane:

CH₄ + 2O₂ ⇒ CO₂ + 2H₂O

Calculations:

1. Theoretical quantity of carbon dioxide:

All calculations will be based on the amount of methane because the problem specifies that it is the limiting reagent:

12.0g of CH₄ × (1 mol of CH₄/16g CH₄) × (1 mole of CO₂/1 mole of CH₄) × (44g CO₂/1 mole of CO₂)

= 33g of CO₂

2. Percent yield:

= Actual yield/Theoretical yield × 100

= 22.0g/33g × 100

= 66.7%

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Answer:

renewable energy sources such as solar and wind DONT emit carbon dioxide and other greenhouse gases that contribute to global warming

Explanation:

With a good mask-to-face seal and an oxygen flow rate of 15 L/min, the nonrebreathing mask is capable of delivering up to  90% inspired oxygen.

FiO2 is the fraction of inspired oxygen which is explained as the concentration of oxygen inhaled by a person.

It delivers a high concentration of oxygen. Hence the liter flow will be 8-15L/min with the percentage of oxygen between 60-90%.

The liter flow of nonbreathing mask must not be less than 8L/min.

From the above information we can conclude that the fraction of inspired oxygen for a nonbreathing mask is 90%

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To successfully adjust the pH, as there was no equipment to measure and transfer the correct volume of acid, then A. Use a less concentrated acid to adjust the pH so the required volume would be larger.

This is a substance that changes the taste in water solution and changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis).

Hence because there was no equipment available to measure and transfer the correct volume of acid, the best and safest and most successful thing to be done is to use a less concentrated acid to adjust the pH so the required volume would be larger.

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The Part of Nicotinamide Adenine Dinucleotide NADH that is a vitamin is niacin, a type of B vitamin.

This cofactor acts as a hydrogen acceptor in oxidation-reduction reactions.

NADH  is the reduced form of the NAD+, which means that it gains the electron lost by NAD+. NADH is a very important coenzyme central to metabolism.

   NADH is a dinucloetide because it consists of two nucleotides joined through their phosphate groups.

 One nucleotide contains an adenine nucleobase and the other nicotinamide.

A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's role as a catalyst in a chemical reaction. A cofactor binds to an enzyme to bring about its  catalytic reaction.

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H - C ≡ C - CH₂ - CH₃ this is an alkyne molecule.

Hence, Option C is correct answer.

The saturated hydrocarbon which have only single bonds between the carbon atoms is called Alkanes.

The unsaturated hydrocarbon which have at least one carbon carbon double bond is called Alkene.

The unsaturated hydrocarbon which have one or more than one carbon carbon triple bonds is called Alkynes.

H - C ≡ C - CH₂ - CH₃ in this molecule one triple bond is present so it is alkyne.

Thus from the above conclusion we can say that H - C ≡ C - CH₂ - CH₃ this is an alkyne molecule.

Hence, Option C is correct answer.

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Answer:

This is an example of an exothermic reaction.

Explanation:

When the heat of combustion is negative, the reaction is exothermic. This means the reaction releases heat as a product.

The law that relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions is ideal gas law (option C).

Ideal gas law in physics refers to the equation of state of an ideal gas. The law equation is as follows:

PV = nRT

Where;

Therefore, it can be said that the law that relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions is ideal gas law.

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Answer:

C. Ideal Gas Law

Explanation:

edge ;)

The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.

Hence, Option (B) is correct answer.

The minimum amount of energy that must be provided by a reacting molecules to get converted into the product is called Activation energy.

It is expressed as:

[tex]k = Ae^{\frac{-E_a}{RT}}[/tex]

where,

k = rate constant

A = pre-exponential factor

Eₐ = activation energy

R = universal gas constant

T = absolute temperature in K

Thus from the above conclusion we can say that The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.

Hence, Option (B) is correct answer.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?

A. The change in free energy of the reaction is positive.

B. The activation energy of the reaction is high.

C. The change in free energy of the reaction is negative.

D. This is a hydrolysis reaction, so it requires an input of energy.

E. The free energy of the products is higher than the free energy of the reactants.

Answer:

D.) A symbol of magnesium Mg has two dots representing two free electrons.

Explanation:

Magnesium is located in the second group (column) of the periodic table. Elements located here have 2 valence electrons in their outermost shell. Thus, the electron dot diagram of magnesium has 2 dots symbolizing the 2 valence electrons.

We use a solution, such as a cabbage ph indicator, to measure the ph of household items :

Anthocyanin, a water-soluble pigment found in red cabbage, can change color when combined with an acid or a basic. The color changes to red in situations with a pH under 7, and to bluish-green in alkaline (basic) environments with a pH above 7. Cabbage isn't known to cause acid reflux, but plenty of other common foods are.

Anthocyanin turns pink when it interacts with the hydronium ions in an acid, and blue or green when it interacts with the hydroxide ions in a base. Because it may inform us if a substance is acidic or basic by changing color, cabbage juice is referred to as a pH indicator.

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The two lines show that these are the only two lines  that do not cause energy transition in the sodium atom. Option D

The spectrum of the sodium atom appears as a doublet. This implies that there are two lines in the spectrum and they appear as bright yellow lines that are not spaced apart in the spectrum.

The  two bright yellow vertical lines in the spectrum shows that these are the only two lines  that do not cause energy transition in the sodium atom.

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Hydrochloric acid is a different kind of acid than chloric acid.

Ternary Acids (Oxy-acids) Ternary acids are also referred to as “Oxy-acids. Include hydrogen and oxygen and yet another (normally) nonmetallic detail. Those acids comprise each hydrogen and oxygen but their names make no reference to either hydrogen or oxygen.

A ternary acid is an acid that has the elements hydrogen and oxygen together with every other element, frequently a nonmetal. Or, they comprise hydrogen in addition to a polyatomic ion. An -ate complicated ion is named an -ic acid. as an example, HClO3(aq) consists of the chlorate ion and is known as chloric acid.

A binary acid is an acidic compound that always has hydrogen boned to every other chemical element, most of the time a nonmetal. Ternary acids are acidic compounds that comprise hydrogen and oxygen blended with some other detail. Binary acid has one style of a chemical element (hydrogen bonded to a nonmetal) .

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n = m/M = 2/18 = 1/9 ~0,1 mol

Answer:

.111 mole    (using 3 significant digits)

Explanation:

Mole weight of H2O  = 2 x 1.008  + 15.999 = 18.015 gm/mole

2 gm / 18.015 gm/mole = .111 mole

Answer:

0.638 M NaOH

Explanation:

To find the molarity of the solution, you need to (1) convert grams NaOH to moles NaOH (via the molar mass of NaOH) and then (2) calculate the molarity (via the molarity formula). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator).

(Step 1)

Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol

Molar Mass (NaOH): 39.996 g/mol

25.5 grams NaOH                 1 mole
-----------------------------  x  ----------------------------  =  0.638 moles NaOH
                                           39.996 grams

(Step 2)

Molarity = moles / volume (L)

Molarity = 0.638 moles / 1 L

Molarity = 0.638 M

Taking into account the reaction stoichiometry, 15.33 grams ethanol could be obtained from 30 grams of glucose.

In first place, the balanced reaction is:

C₆H₁₂O₆  → 2 C₂H₅OH + 2 CO₂

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 following rule of three can be applied: if by reaction stoichiometry 180 grams of glucose form 92 grams of ethanol, 30 grams of glucose form how much mass of ethanol?

[tex]mass of ethanol=\frac{30 grams of glucosex 92 grams of ethanol}{180 grams of glucose}[/tex]

mass of ethanol= 15.33 grams

Then, 15.33 grams ethanol could be obtained from 30 grams of glucose.

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From the calculations, the pH of the buffer is 3.1.

The  Henderson-Hasselbach equation comes in handy when we deal with the pH of a buffer solution. From that equation;

pH = pKa + log[(salt/acid]

Amount of the salt = 25/1000 *  0.50 M = 0.0125 moles

Amount of the acid = 75/1000 *  1.00 M = 0.075 moles

Total volume = ( 25 + 75)/1000 = 0.1 L

Molarity of salt = 0.0125 moles/0.1 L = 0.125 M

Molarity of the acid = 0.075 moles/0.1 L = 0.75 M

Given that the pKa of lactic acid is 3.86

pH = 3.86 + log( 0.125/0.75)

pH = 3.1

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The ΔG° for the reaction in kJ/mol is -17.09.

Calculation,

The reaction is given below.

[tex]ICl(g)+Cl_{2} (g)[/tex]  → [tex]ICl_{3} (s)[/tex]

The ΔG° for [tex]ICl(g)[/tex] = -5.5  kJ/mol

The ΔG° for [tex]ICl_{3} (s)[/tex]  = -22.59  kJ/mol

The ΔG° for  [tex]Cl_{2} (g)[/tex]  = 0  kJ/mol ( change in gibb's free energy of standard state )

ΔG° for the reaction =  ΔG° (product) -  ΔG° (reactant)

ΔG°  for the reaction = -22.59  kJ/mol - ( -5.5  kJ/mol + 0  kJ/mol )

 ΔG°  for the reaction = -17.09  kJ/mol

The value of change standard gibb's free energy for the standard state ( most stable form of elements) is zero.

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Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form protein concentration mechanisms that do not include Boiling.

Amino acids are natural compounds composed particularly of nitrogen, carbon, hydrogen, and oxygen. Your body desires 20 awesome amino acids to grow and function. amino acid, any of a group of organic molecules that consist of a basic amino group (―NH2), an acidic carboxyl group (―COOH).

fruits have an excessive content of amino acid that allows modify insulin degrees. fruits like bananas, apples, berries, and so forth., are rich resources of amino acids.

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The surface area of the statute covered with the gold is 9,627.32 m².

Volume is a scalar quantity expressing the amount of three-dimensional space enclosed by a closed surface.

The volume of the statute covered with gold is calculated as follows;

Volume = mass/density

Volume = (279 kg) / (19,320 kg/m³)

Volume = 0.0144 m³

The surface area of a solid object is a measure of the total area that the surface of the object occupies.

V = S.A x h

where;

S.A = V/h

S.A = (0.0144) / (0.0015 x 10⁻³)

S.A = 9,627.32 m²

Thus, the surface area of the statute covered with the gold is 9,627.32 m².

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