How many grams of oxalic acid dihydrate is needed to preapare 500.0 ml of a 0.185m?

The mass of \(Al_{2} S_{3}\) produced is 15.616 grams.

The reaction taking place is as follows:

\(2Al+ 3S\) →\(Al_{2} S_{3} (s)\)

Moles of Al = mass/molar mass = 10.0g/27.0g/mol

= 0.370 mol

Moles of S = mass/molar mass = 15.0g/(32.065g/mol)

= 0.468 mol

Al and S reacts in the molar ratio of 2:3.

2 moles of Al reacts with 3 moles of S

0.370 moles of Al will react with S = (3/2)*0.370mol

= 0.555 mol

Similarly, 0.468 moles of S will react with Al = 2/3 *0.468mol

= 0.312 mol

Thus, Al is in excess and S is the limiting reactant (some of Al will be left over ,S will completely react)

So, moles of \(Al_{2} S_{3}\) produced=1/3*0.312 mol of S

= 0.104 mol

Mass of \(Al_{2} S_{3}\) produced = moles*molar mass of \(Al_{2} S_{3}\)

= 0.104mol*150.158g/mol

= 15.616 grams

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Sodium hydroxide (NaOH) and hydrochloric acid (HCl) cannot exist together in their pure form because they react with each other to form a highly exothermic reaction that generates a large amount of heat and releases hydrogen gas.

This reaction is known as a neutralization reaction, where the sodium ions (Na⁺) from the NaOH combine with the chloride ions (Cl⁻) from the HCl to form sodium chloride (NaCl), which is a salt.

The hydrogen ions (H⁺) from the HCl combine with the hydroxide ions (OH⁻) from the NaOH to form water (H₂O).

This reaction is so powerful that it can cause an explosion or fire if not handled carefully. Therefore, NaOH and HCl are stored separately and only mixed in controlled conditions.

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The energy is 375 J.

Energy is the quantitative belongings that are transferred to a frame or to a physical gadget, recognizable within the overall performance of labor and within the shape of warmth and mild. power is a conserved amount—the law of conservation of strength states that power may be converted in form, but now not created or destroyed.

Calculation:-

Total energy = 1200 J

Transfered emergy = 375 J

The useful energy is the energy to do work = 375 J.

The ability or strength to do paintings, along with the potential to transport an item (of a given mass) by means of the application of pressure. power can exist in a spread of forms, which includes electric, mechanical, chemical, thermal, or nuclear, and may be transformed from one form to another.

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The percentage of chloride in the unknown sample is approximately 15.93%.

To calculate the percentage of chloride in the unknown sample, you can use the mass of silver chloride obtained to determine the number of moles of chloride in the original sample, and then convert that to a percentage.

First, calculate the number of moles of silver chloride by dividing the mass by its molar mass:

0.7332 g / 143.32 g/mol = 0.00513 mol AgCl

Next, calculate the number of moles of chloride in the original sample by assuming a 1:1 ratio of chloride ions to silver ions in the reaction:

0.00513 mol AgCl * 1 Cl- / 1 Ag+ = 0.00513 mol Cl-

Finally, divide the number of moles of chloride by the mass of the original sample and multiply by 100 to convert to a percentage:

(0.00513 mol Cl- / 0.3221 g) * 100 = 15.93%

So, the percentage of chloride in the unknown sample is approximately 15.93%.

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An acid is a compound that produces hydrogen ions (H+) in a solution. This type of solution is called an acidic solution. The strength of an acid is measured by its pH level, with a lower pH indicating a stronger acid.

Acids can be found in many everyday substances, such as lemon juice, vinegar, and battery acid. They can also be used in many industrial processes, such as the production of fertilizers and the cleaning of metals.

In contrast, a base is a compound that produces hydroxide ions (OH-) in a solution, and it has a higher pH level. Salts and polymers are not directly related to the production of hydrogen ions in solution.

A compound that produces hydrogen ions in solution is known as an acid (option b). Acids increase the concentration of hydrogen ions (H+) when dissolved in water.

These ions give acidic solutions their characteristic properties, such as a sour taste and the ability to react with bases. In contrast, salts are neutral compounds that result from the reaction between an acid and a base.

Bases, on the other hand, produce hydroxide ions (OH-) in solution, making the solution more alkaline. Polymers are large molecules made up of repeating smaller units called monomers and are not directly related to the production of hydrogen ions in a solution.

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Answer:

Yeah

Explanation:

Propylene glycol can be dehydrated to propionaldehyde which can in turn be reductively aminated to propylamine.

Propionaldehyde can be converted to n-propyl amine in two steps.

Conversion of propionaldehyde to oxime

Propionaldehyde is treated with hydroxyl amine in weakly acidic medium to form imine product known as propionaldoxime.

CH₃CH₂CHO+NH₂OH->CH₃CH₂CH=N-OH+H₂O

Reduction of imine to form amine

In this step,propionaldoxime is reduced by proper reducing agent like Na in ethanol to form n-propyl amine.

CH₃CH₂CH=NO-Na-C₂H5OH-> CH₃CH₂CH₂NH₂

The equilibrium constant is the ratio of the reactants to the products which is 2.

The equilibrium constant shows the extent to which the reactants are converted into products. The equation of this reaction could be written from the number of molecules of the reactants.

Let the reactants be A and B and the product C, the reaction equation thus becomes;

The equilibrium constant is the ratio of the reactants to the products which is 2.

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The number of valence electrons in each of the atoms are;

B - 3

Al - 3

Cl - 7

Ne - 8

We define an atom as the smallest part of a substance that can take part in a chemical reaction. We know that when we begin to break down the elements that the atoms can be found in the element and there are sub atomic particles that can also be found inside the atom of the element.

The electrons that are found at the last shell or the outermost shell of the atom are the ones that we call the valence electrons that can be found in the atom.

The electronic configuration of boron is \(1s^2 2s^2 2p^1\) (the n =2 level is the valence shell)

The electronic configuration of Al is \(1s^2 2s^2 2p^6 3s^2 3p^1\)( the n= 3level is the valence shell)

The electron configuration of Cl is \(1s^2 2s^2 sp^6 3s^23p^5\) ( the n= 3level is the valence shell)

The electron configuration of Ne is \(1s^2 2s^2 2p^6\) (the n =2 level is the valence shell)

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The solution that is hyperosmotic to a normal mammalian cell is the 200 millimolar NaCl.

A solution is hyperosmotic to a normal mammalian cell if it has a greater solute concentration than the cell. Therefore, the solution that is hyperosmotic to a normal mammalian cell can be determined by comparing their solute concentration.

Here are the given solutions:

100 millimolar urea (a penetrating solute)

200 millimolar NaCl

100 millimolar NaCl

300 millimolar glucose

A normal mammalian cell has an osmolarity of about 300 milliosmoles/liter.

The osmolarity is the total solute concentration of a solution.

Since the solution with the highest concentration of solutes will be hyperosmotic to a normal mammalian cell, we will compare the osmolarity of the four solutions to that of a normal mammalian cell.

The osmolarity of the four solutions can be calculated using the formula, osmolarity = molarity x the number of particles the solute dissociates into.

The number of particles is one for urea, two for NaCl, and one for glucose, since glucose does not dissociate into particles in water.

Now we can determine the osmolarity of the solutions:

Osmolarity of 100 millimolar urea solution = 100 millimoles/liter

Osmolarity of 200 millimolar NaCl solution = 400 milliosmoles/liter

Osmolarity of 100 millimolar NaCl solution = 200 milliosmoles/liter

Osmolarity of 300 millimolar glucose solution = 300 milliosmoles/liter

From the osmolarity values calculated above, the 200 millimolar NaCl solution has the highest concentration of solutes and is therefore the most hyperosmotic solution compared to a normal mammalian cell.

Answer: The solution that is hyperosmotic to a normal mammalian cell is the 200 millimolar NaCl.

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The two substances have different physical properties and compositions, despite having equal masses.

Heat capacity, also known as thermal capacity, is a measure of the amount of heat energy required to raise the temperature of an object or substance by a certain amount. It is denoted by the symbol "C" and is expressed in units of energy per degree Celsius or Kelvin (J/°C or J/K).

The heat capacity of an object depends on its mass and the specific heat capacity of the material it is composed of. The specific heat capacity (or simply specific heat) is the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius or one Kelvin. It is denoted by the symbol "c" and is expressed in units of energy per unit mass per degree Celsius or Kelvin (J/(kg·°C) or J/(kg·K)).

Based on the given information, we can claim that the two substances have different specific heat capacities. Specific heat capacity is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. The substance that requires twice as much heat as the other to have the same temperature change has a lower specific heat capacity, meaning it takes less energy to raise its temperature compared to the substance with a higher specific heat capacity. Therefore, we can conclude that the two substances have different physical properties and compositions, despite having equal masses.

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Answer:

True

Explanation:

The given chemical equation is balanced as it has equal number of atoms of each element on both sides.Hence it is true.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

C

Explanation:

I am not 100% sure, but it might be the answer.

Answer:

you have to use the avogadro's constant of 6.023×10^23 to calculate the number of molecules of carbon dioxide.and you also have to use the molecular mass which is 44.

35.5/44×6.023×10^23

=4.85×10^23

I hope this helps and sorry if it's wrong

Density of solution = 1.06 g/mL

Therefore, mass of 875 mL of solution = 875 * 1.06 = 927.5 g

Given mass of NaCl in the solution = 98.6 g

Therefore, the percentage by mass of the solution = (mass of NaCl / mass of solution) × 100= 98.6 / 927.5 × 100 = 10.63 % ≈ 10.6 %

Hence, option d is the correct answer.

An amount of 98.6 g of NaCl is dissolved in enough water to form 875 mL of solution. The mass of the solution is 927.5 g. The percentage by mass of the solution is 10.6 %. Therefore, the correct option is d.

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The pulse duration of periodic pulse train with a duty cycle of 15% and a period of 115 nanoseconds is 17.25 nanoseconds.

Duty cycle  = 15% or 0.15

Time period = 115 nanoseconds

The ratio of the amount of time the signal spends in the "on" state to its overall duration is known as the duty cycle. The signal is on for 15% of the entire period when the duty cycle is given as 15% in this instance. Duty cycles are a term used to represent the percentage of time that an electrical signal is active in a device, such as the power switch in a switching power supply, or when an organism, like a neuron, fires an action potential.

Calculating the duty cycle and the period of the pulse train -

Pulse duration = Duty cycle x Period

= 0.15 x 115

= 17.25

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The number of valence electrons for neutral atoms is the same as the number of the atom's main group. A periodic table element's column can be used to determine its main group number. For instance, carbon, which belongs to group 4, has four valence electrons.

For an atom to become a charged ion and create an ionic connection with another atom, it must have between one and three valence electrons, which it will lose.

Atoms can be very reactive or extremely inactive depending on how many valence electrons they have. The quantity of valence electrons in an atom also affects whether or not it is more likely to lose or acquire electrons during chemical processes. Metals may carry electricity because they readily give away electrons.

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Answer:

19 million yards

Explanation:

I'm here

A hyperpolarizing graded potential can be caused by the opening of a K+ channel. When a K+ channel opens, K+ ions will move out of the cell, which increases the concentration of positively charged ions outside the cell and creates a more negative membrane potential inside the cell.

This hyperpolarization makes it more difficult for an action potential to be generated.

A hyperpolarizing graded potential can be caused by a K+ channel opening. When the potassium (K+) channel opens, it allows K+ ions to flow out of the cell, leading to a more negative membrane potential, which is known as hyperpolarization.

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Answer:

Nature is important

Explanation:

Answer:8.334×10^-6 moles

Explanation:

a mole is 6.023×10^23

5.02×10^18 ÷ 6.023×10^23=8.33×10^-6

5N force was applied to an object if 35 j of work was done and the object moved 7 m

A force is an effect that can alter an object motion according to physics and an object with mass can change its velocity or accelerate as a result force and also force is as push or pull and work done by the force on an object means assuming that direction of the force is parallel to the displacement of the object

Then the formula is

W = f × d

Where f is the magnitude of force and d is the displacement of the object

Then W = 35 J is the work done and

d = 7m is the displacement of the object

So rearrange the equation then

F = 35/7 = 5N

5N force was applied to an object if 35 j of work was done and the object moved 7 m

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Answer:

Explanation:

3

Significant figures are the number of digits that add to the correctness of a value, frequently a measurement. The following numbers are three significant digits 876000, 1.20 x 10⁵, and 8.77 x 10⁻⁴.

The number of significant single digits (0 to 9 inclusive) in the coefficient of expression in the scientific notation is referred to as "significant figures" (SF). The expression's number of significant figures reveals the engineer's or scientist's level of assurance or precision when expressing a quantity.

When a number is rounded off, its value is maintained but is brought closer to the next number, simplifying the number. The crucial figures are preserved when numbers are rounded off.

The following numbers are rounded off:

1. 876000

2. 1.20 x 10⁵

3. 8.77 x 10⁻⁴

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A mature chicken of about 10 months of age is almost always cooked by Braise or Stew cooking method.

A mature chicken, which is over 10 months old and weighing in the range of 4 to 7 pounds. Their meat is very flavorful but tougher than that of the broiler-fryers and roasters.

They are best used for stews and soups, or should be cooked slowly with a moist heat method such as simmering or braising.

The main cooking method for Mature birds should be Braise or stew,

Braising involves cooking large pieces of meat or chicken partially covered in liquid, while stewing uses smaller pieces of meat totally immersed in liquid.

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Answer:

A) Chemical Change

Explanation:

Chemical changes occur when bonds are broken and formed between molecules or atoms. This means that one substance with a particular set of properties (such as melting point, color, taste, etc.) is turned into a different substance with different properties.

Answer:

B

Explanation:

We are given that ammonia can be produced from hydrogen gas and nitrogen gas according to the equation:

\(\displaystyle 3\text{H$_2$} + \text{N$_2$} \longrightarrow 2\text{NH$_3$}\)

We want to determine the mass of hydrogen gas that must have reacted if 0.575 g of NH₃ was produced.

To do so, we can convert from grams of NH₃ to moles of NH₃, moles of NH₃ to moles of H₂, and moles of H₂ to grams of H₂.

We are given that the molar masses of NH₃ and H₂ are 17.03 g/mol and 2.0158 g/mol, respectively.

From the equation, we can see that two moles of NH₃ is produced from every three moles of H₂.

With the initial value, perform dimensional analysis:

\(\displaystyle \begin{aligned} 0.575\text{ g NH$_3$}& \cdot \frac{1\text{ mol NH$_3$}}{17.03\text{ g NH$_3$}} \cdot\frac{3\text{ mol H$_2$}}{2\text{ mol NH$_3$}} \cdot \frac{2.0158\text{ g H$_2$}}{1\text{ mol H$_2$}} \\ \\ & = 0.102\text{ g H$_2$}\end{aligned}\)

*Assuming 100% efficiency.

Our final answer should have three significant figures. (The first term has three, the second term has four (the one is exact), the third term is exact, and the fourth term has five. Hence, the product should have only three.)

In conclusion, our answer is B.

Answer:

Earth

Strongest

Moon

Gravitational

Tide

Pulls

Bulge

Waves

Proximity

Low Tide

Answer:

Because of the electronegativity difference C-O (covalent) and Ca-O (ionic) bonds have.

Explanation:

Hello there!

In this case, in order to understand the polarity of this compound, calcium carbonate, it firstly necessary that it is comes from the definition of electronegativity, as a property defining the capacity to attract electrons from another atom; thus, since the electronegativities of calcium, carbon an oxygen are 1.0, 2.55 and 3.44, it is possible to realize this compound has O-Ca and O-C bonds according to its Lewis dot structure. In such a way, we calculate the difference electronegativity for these two bonds:

\(\Delta E_{O-Ca}=3.44-1.0 = 2.44\\\\\Delta E_{O-C}=3.44-2.55=0.89\)

Thus, since 2.44 accounts for an ionic bond and 0.89 for a covalent one, we bear out the given statement in the question.

For a current of 15.0 A is passed through molten magnesium chloride for 15.0 hours, the amount of moles of magnesium metal   is mathematically given as

M=4.2mole

Generally, the equation for the Chemical reaction  is mathematically given as

Mg+2e---->Mg

Therefore

Charge=Currect*time

Q=15*5*4.0*10^4

Q=8.10*10^5C

In conclusion, the number of moles

8.10*10^5C*1M/(2*96500)

M=4.2mole

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The amount of metal plated in an electrolytic cell is directly proportional to the amount of metal plated in a voltaic cell. Therefore, if 3.70 g of metal is plated in the voltaic cell, the same amount of metal will be plated in the electrolytic cell.

In an electrolytic cell, the deposition of metal on an electrode occurs through the supply of electrical energy. The amount of metal plated in an electrolytic cell is determined by Faraday's law of electrolysis, which states that the amount of substance deposited is proportional to the quantity of electricity passed through the cell.

Given that 3.70 g of metal is plated in the voltaic cell, we can infer that the same amount of metal will be plated in the electrolytic cell. This is because the electrochemical reactions in both types of cells involve the same metal species and the same quantity of electricity passing through the cell.

Therefore, if 3.70 g of metal is plated in the voltaic cell, the same amount of metal, 3.70 g, will be plated in the electrolytic cell. The electrolytic cell allows for the controlled deposition of metal through the application of electrical energy.

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