How many minutes would be required to produce a mass of 6. 38 g al using a current of 12. 50 amps?

Answer:

Molarity = 2 M

Explanation:

The molarity can be found using the molarity ratio:

Molarity = moles / volume (L)

You can plug the given moles and volume into the ratio and solve.

Molarity = moles / volume

Molarity = 1 mole / 0.500 L

Molarity = 2 M

If density of gold is 19.3g/cm3 amd mass is 5.23 g, then volume obtained is 0.27cm3.

Density is defined as how much a matter is packed in given area. It is represented by ρ.

ρ = m/ V

Given,

density of gold = 19.3 g/cm3

mass of gold = 5.23 g

As we know that,

density = mass/ volume

mass = density× volume

19.3 = 5.23 / volume

volume = 5.23/19.3

volume = 0.27 cm3.

Thus, if density and mass is given volume can be obtained.

Volume of gold is given as 0.27 cm3.

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3. 4 g of a nonelectrolyte dissolved in 78. 3 g of water produces a solution. The molar mass of the solute will be 17.94.

Molar mass of a substance is its mass in grams in per mole of  a solution.

Freezing point: Freezing point of a substance is a temperature at which a liquid starts to solidify.

Depression in the freezing point can be calculated

[Depression in freezing point of pure solvent—Freezing point of solution] =[(0) - (-4.5)] °C =4.5 °C

molar mass = Number of moles of solute m / Mass of solvent in Kg

3.4g / M x 1/ 0.0783 kg  = 43.42

Substitute AT by 4.5°C , Kr by 1.86 °C/m, and m by 43.42 m in equation (1) as follows:

1.86 x 43.42 / 4.5 = 17.94

Therefore, molar mass of solute to be 17.94.

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Answer:

iron deficiency

Explanation:

Answer:

32 ° F

Explanation:

Freezing temp for water is 32 degrees at 1 atm

Chiari type ii malformation associated with myelomeningocele can lead to severe morbidity and mortality if it is not identified and treated promptly.

People diagnosed with myelomeningocele have abnormalities of the brain and spine, including spinal cord defects and symptoms related to the area in which the spinal column and the brain meet, known as Chiari malformation. Chiari Type II or Arnold-Chiari malformation is a worse form in which the cerebellar vermis and some portion of the brain stem descend into the cervical chine.

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Answer:

6.4 L

Explanation:

When all other variables are held constant, you can use Boyle's Law to find the missing volume:

P₁V₁ = P₂V₂

In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the theoretical volume by plugging the given values into the equation and simplifying.

P₁ = 3.2 atm                      P₂ = 1.0 atm

V₁ = 2.0 L                          V₂ = ? L

P₁V₁ = P₂V₂                                                    <----- Boyle's Law

(3.2 atm)(2.0 L) = (1.0 atm)V₂                        <----- Insert values

6.4 = (1.0 atm)V₂                                           <----- Simplify left side

6.4 = V₂                                                        <----- Divide both sides by 1.0

Answer:

6.4L or C on Brainly.

Explanation:

Yes the system is at equilibrium if reactants and products are at equilibrium at 10⁻³ < K <10³.\

When opposing reactions are happening at the same pace, chemical equilibrium happens.

                                     [tex]N_2O_4 (g)[/tex] → [tex]2 NO _2(g)[/tex]

We represent the system's equation with a double arrow since the forward and reverse processes are both active in an equilibrium state.

Forward Reaction:                               Rate Law:

[tex]N_2O_4(g)[/tex] → [tex]2 NO_2 (g)[/tex]                              Rate = [tex]k_f [N_2O_4][/tex]

Reverse Reaction:                                Rate Law:

[tex]2 NO_2 (g)[/tex] → [tex]N_2O_4(g)[/tex]                               Rate = [tex]k_f [NO_2]^2[/tex]

Therefore at equilibrium;

[tex]Rate_f=Rate_r\\[/tex]

[tex]k_f[N_O_4] = k_r[NO_2]^2[/tex]

It becomes:

[tex]\frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} \\[/tex]

[tex]K_e_q = \frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} = a constant[/tex]

The reciprocal of the equilibrium constant of the forward reaction is the equilibrium constant of a reaction moving in the opposite direction.

The reaction is said to have a large amount of both reactants and products at equilibrium at 10⁻³ < K <10³.

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The most stable form of naoch2ch3 in ch3ch2oh.

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Option (d) acetylcholine is the right answer.

Acetylcholine is the chemical compound released by the motor-neuron axon terminals.

Chemically speaking, acetylcholine is an organic chemical that is an ester of acetic acid and choline.

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They are classified on the basis of their physical features- Shape and Appearance.

The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).

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♪ ♫ Hope this helps :D

Moderate alcohol consumption is no more than [tex]One[/tex] alcoholic drink(s) daily for adult women and up to [tex]Two[/tex] drink(s) daily for adult men.

What is an alcohol?

Alcohol is an organic compound containing a hydroxyl group and a carbon atom; Alcohol can be an intoxicant found in alcoholic beverages.

An alcoholic drink (also called an alcoholic beverage, adult beverage, or simply a drink) is a drink that contains ethanol, a type of alcohol that acts as a drug and is produced by fermentation of grains, fruits, or other sources of sugar.

The consumption of alcoholic drinks, often referred to as "drinking", plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.

So, according to the scientific studies, the alcoholic consumption for women in a day is not more then one and for men is not for two drink(s)

1 Drink includes:

For beer: 355 ML

For Wine: 148 ML

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I don't know the answer

In a solution, when the concentrations of a weak acid and its conjugate base are equal, the -log of the concentration of H+ and the -log of the Ka are equal.

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The pH can be determined by the base dissociation constant value (Kb). The pH of the solution after 15 mL of ammonia is added to the solution will be 10.26.

The pH of the solution can be given by the pOH value that is determined by the concentration and the base dissociation constant.

The balanced chemical reaction is given as,

HCl + NH₃ → NH₄Cl

The moles before reaction was 0.015L× 0.15M =  0.00225 moles and, 0.025 L × 1.00 M = 0.025 moles

The moles after reaction are 0.00225 moles - 0.025 moles = 0.02275 moles

pOH is calculated as,

pOH = 4.74 + log ( 0.00225 ÷ 0.02275 )

= 3.73

Further pH is calculated as,

pH = 14 - 3.73

= 10.26

Therefore, 10.26 is the pH of the solution.

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The actual  theoretically yield from this reaction is 86.5 grams.

What is theoretically yield?

∵ The percentage yield = (actual yield/theoretical yield) * 100.

To calculate the theoretical yield from the balanced reaction:

             CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,

It is clear that 1 mole of CaCO₃ reacts with 2 mole of HCl to produce 1 mole of CaCl₂, 1 mole of CO₂, and 1 mole H₂O.

to calculate the no. of moles of 95.0 g CaCO₃

n = mass/molar mass = (95.0 g)/(100.0869 g/mole) = 0.95 mol.

Using cross multiplication:

1 mole of CaCO₃ produce  → 1 mole of CaCl₂, from stichiometry.

∴ 0.95 mole of CaCO₃ produce → 0.95 mole of CaCl₂.

∴ The mass of CaCl₂ (theoretical yield) = (no. of moles) * (molar mass)                         ⇒(0.95 mole)*(110.98  g/mole) = 105.34 g.

∵ The percentage yield = (actual yield/theoretical yield)*100.

The percentage yield = 82.15%, theoretical yield = 105.34 g.

∴ The actual yield of CaCl₂ = (The percentage yield)(theoretical yield)/100

                                 = (82.15%)(105.34 g)/100 = 86.53 g ≅ 86.5 g.

So, the actual  theoretically yield from this reaction is 86.5 grams.

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The percentage of volume of ethanol is 9.5%.

Volume/volume percentage (v/v% or percent v/v) is a unit used to express how much of a material is present in a solution. It is defined as the volume of the solute divided by the sum of the volumes of the solution, multiplied by one hundred. Examples: The average alcohol concentration (v/v%) of wine is 12 percent.

The formula used to get the volume of ethanol in percentages is

Percent of volume of ethanol = (volume of solute / total volume) *  100

Percent volume of Ethanol = (volume of ethanol  / total volume)  * 100

                                            =  95mL  / 1000mL  *  100

                                            = 9.5%

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91.4 grams mass of KCl is required.

Concentration = moles/Volume

2.45M=mol/0.5L

2.45M⋅0.5L=mol

mol=1.225

Convert no. of moles to grams using the atomic mass of K + Cl

1.225mol⋅(39.1+35.5)/gmol

1.225mol⋅74.6g

mol=1.225⋅74.6g = 91.4g

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NaHCO3 is can be mixed in solution with H₂CO3 to make a buffer.

Sodium bicarbonate (IUPAC name: sodium bicarbonate, commonly known as baking soda or sodium bicarbonate) is a compound with the chemical formula NaHCO3. It is a salt composed of a sodium cation (Na+) and bicarbonate anion (HCO3-). Sodium bicarbonate is a crystalline white solid that often looks like a fine powder. It has a slightly salty, alkaline taste similar to soda carbonate (sodium carbonate). The natural mineral form is Narcolite. It is a component of sodium bicarbonate and is dissolved in many mineral springs.

Sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion. Doctors may also prescribe sodium bicarbonate to reduce the acidity of blood and urine under certain conditions.

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The balanced chemical equation in a basic solution will be,

[tex]BrO^{-} + 4OH^{-} +4Fe^{+3}[/tex] → [tex]BrO_{3} ^{-} + 4H_{2} O+4Fe^{+2}[/tex]

The reaction in which oxidation and reduction reaction takes place simultaneously is called redox reaction or oxidation - reduction reaction .

Rules for the balanced chemical equation in a basic solution are :

Therefore, the balanced chemical equation in a basic solution will be,

[tex]BrO^{-} + 4OH^{-} +4Fe^{+3}[/tex] → [tex]BrO_{3} ^{-} + 4H_{2} O+4Fe^{+2}[/tex]

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Energy leaves the Sun's core and goes by radiation, convection, and radiation on its way to the surface.

Energy leaves the sun's core and initially travels towards the radiation zone. In the radiation zone, the gas is tightly compressed. Here, electromagnetic waves are absorbed and reradiated to transfer energy. Energy can take more than 100,000 years to get through this area because it is so dense.

Thus, energy radiates out initially from the core before being delivered by convection to the outer layers.

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The given pH scale range from [tex]0-3[/tex] indicates the strong acid.

The pH scale, which ranges from [tex]0 -14[/tex], was developed by Sorensen to quantitatively define the strength of an acid and a base.

A pH value indicates the amounts of hydrogen ions and, hydroxide ions present. The negative logarithm of the hydrogen ion concentration is referred to as pH and is represented by:

[tex]pH = -log [H^{+} ][/tex]

For acids, the pH value is always less than [tex]7[/tex].

For bases, the pH value is always more than [tex]7[/tex].

For neutral solution, pH value is equal to [tex]7[/tex].

Thus, for the provided pH scale range [tex]0-3[/tex], it represents strong acid which will give large concentration of protons on dissociation. since lower pH value indicates higher concentration of protons created by an acid.

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Answer:

.4 moles of hydrogen

Explanation:

Formula for water ==   H2 O  

   so you can see there are twice as many hydrogen moles as water moles

           .2 * 2 = .4

When the hydrocarbon was burned 0.20 mol of water were produced. 0.40 moles of hydrogen atoms are there in 0.20 mol of water.

A mole is a unit used to measure the concentration of a chemical in chemistry. It is described as the quantity of a substance that includes exactly the same number of atoms as there are in exactly 12 grammes of carbon-12. This number can be an entity (such as an atom, molecule, ion, or other particle). The dozen, which represents 12 items, and the pair, which represents 2 items, are two more basic units of measurement that are comparable to the mole.

2 moles H / 1 mole H2O = x moles H / 0.20 moles H2O

2 moles H ×0.20 moles H2O = 1 mole H × x moles H2O

0.40 moles H = x moles H2O

So, there are 0.40 moles of hydrogen atoms in 0.20 moles of water.

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The correct answer would be the structure attached of the form slant up, then run flat in a double bond, slant up and run flat.

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Answer:

D

Explanation:

1.0 mL x 0.1 mM quantity of nag3 was required to reach the equivalence point in the titration.

The technique of titration, also known as titrimetry, is used in chemical qualitative analysis to establish the concentration of a certain analyte in a mixture. Titration, commonly known as volumetric analysis, is an essential analytical chemistry technique. However, the two titration types that are most frequently used in quantitative chemical analysis are redox and acid-base titration, titration Procedures, bases and acids are diluted,oxygen-based titrations, and precipitation titrations. Utilize the titration equation. The equation is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base if the titrant and analyte have a mole ratio of 1:1. (Molarity is the measure of a solution's concentration, which is given in moles of solute per liter of solution.)titrations utilizing intricate metrics.

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Answer:

[tex]\frac{1 m}{100 cm}[/tex]

Explanation:

The final answer has a different set of units. In particular, meters (m) changes to centimeters (cm). To make this change, you need to multiply the first value by proportions.

When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since m is located in the denominator, it must be located in the numerator of the conversion.

Proportion:

1 m = 100 cm

The full expression:

As you can see, the old unit (m) cancels out and you are left with cm in the denominator.

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.

In research, the physicist James Chadwick attacked Beryllium using alpha particles produced by the nuclear reactions of polonium naturally. High radiation penetration through some kind of lead shield was seen, which the then-current particle theories were unable to account for.

There was indeed the production of a carbon-12 nucleus as well as the production of a neutron whenever one blasted beryllium with alpha particles.

The reaction of alpha decay can be written as:

[tex]Be^{9} _{4} + He^{4} _{2}[/tex] → [tex]C^{12} _{6} + n^{1} _{0}[/tex]

Therefore, when atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.

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7 moles of oxygen are in the sample.

According to the chemical formula, each mole of nickel tetracarbonyl contains 4 moles of C atoms. Simply convert it into a fraction by putting the original solution in the denominator and the diluted solution in the numerator if you need to determine the concentration ratio between two solutions. The V/n ratio for each gas must be the same if the two gases are at the same temperature and pressure. The volume ratio of two gases at the same temperature and pressure is equal to their molar ratio. The mole ratio of C to O is 1 : 1

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The 6 models of the atom:

1. John Dalton's atomic model: Daltons Billiard Ball (Solid Sphere) Model

2. J.J. Thomson's model: Plum Pudding model

3. Ernest Rutherford's model: Nuclear model

4. Niels Bohr's model: Planetary model

5. Erwin Schrdinger's model: Electron Cloud Model/Quantum Model

6. Wave mechanical model

The smallest component that makes up a chemical element is an atom. Atoms that are neutral or ionized are the building blocks of all solids, liquids, gases, and plasma. A normal atom is 100 picometers across, which is incredibly small. Because of quantum effects, they are so small that it is impossible to predict their behavior with sufficient precision using classical physics, as if they were, say, tennis balls. One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen. An atom's nucleus makes up more than 99.94% of its mass.

how to build 6 individual atoms?

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Prostaglandins locally acting chemicals are derived from arachidonic acid.

What does arachidonic acid produce?

Is prostaglandins a local hormone?

What is arachidonic acid found in?

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