a 3% solution of sulphuric acid was mixed with an 18% solution of sulphuric acid to produce an 8% solution. howe much 3% solution and how much !8% solution were used to produce 15 l of 8% solution

Answer:

Explanation:

When light travels from air to glass, it slows down due to the change in the refractive index. This causes the wave to bend, a phenomenon known as refraction. The amount of bending depends on the difference in refractive indices between the two materials, and the angle of the incoming wave.

Preheat both the stemless funnel and the filter paper with boiling water due to the fact crystallization can go through at the funnel which then can clog the lowest and block the drift of filtrate all through filtration.

Acetanilide also can be prepared with the aid of acetylating aniline with acetic anhydride inside the presence of focused hydrochloric acid. Dissolve aniline in hydrochloric acid and add acetic anhydride, then stir properly. Pour the aggregate of sodium acetate into water.

Acetanilide, an artificial organic compound added to therapy in 1886 as a fever-reducing drug. Its effectiveness in relieving aches turned into determined soon thereafter, and it became used as an alternative to aspirin for decades in treating such commonplace complaints as headaches, menstrual cramps, and rheumatism. Acetanilide is a weak base because of the resonance systems it suggests. The compound is a beginning fabric for plenty of pharmaceutical capsules like sulfanilamide, a topical antibacterial, antifungal medicine.

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Options 1, 5, 6, 7, and 8 are saturated fatty acids, options 2, 3, and 4 are unsaturated fatty acids. Depending on the type of oil used, Option 4 is both saturated and unsaturated fatty acids.

The presence of the double bonds with in fatty acid chain is what distinguishes saturated fat from unsaturated fat. Unsaturated fats have at least one double bond with in fatty acid chain while saturated fats have no double bond between the individual carbon atoms.

• Solid at the room temperature - Saturated fatty acid

• Liquid at room temperature - Unsaturated fatty acid

• Found primarily in plants and plant products - Unsaturated fatty acid

• Oil - Can be either saturated or unsaturated, depends on the specific type of oil

• Comes primarily from animals and animal products - Saturated fatty acid

• No double bonds within carbon backbone - Saturated fatty acid

• Trans fats are a synthetic form that has a higher melting point - Saturated fatty acid

• Double bonds within carbon backbone - Unsaturated fatty acid

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Answer:

Explanation:

Water is a liquid at room temperature due to its relatively low vapor pressure and high thermal stability.

Water molecules have a combination of hydrogen bonds and dipole-dipole interactions, which result in a moderate level of intermolecular attractive forces. These attractive forces allow water to remain in a liquid state at room temperature, as the energy required to overcome these forces and convert water into a gas (vaporization) is relatively high.

Additionally, water has a high heat capacity, which means that it can absorb a lot of heat energy without undergoing significant temperature changes. This high heat capacity allows water to maintain a stable liquid state over a wide range of temperatures.

Overall, the combination of moderate intermolecular forces and high thermal stability is what makes water a liquid at room temperature.

The mass of copper (II) nitrate that can be formed is 62.7 grams.

If 58 grams of copper (II) nitrate is formed when this experiment is performed in the laboratory, the percent yield for this reaction is 92.5 %.

The mass of copper (II) nitrate that is formed is determined from the mole ratio of the reaction as obtained from the equation of the reaction.

The mole ratio of copper (ii) chloride and copper (ii) nitrate is 1 : 1

The mole of copper (ii) chloride reacted = 45/134.5 moles

The mass of copper (II) nitrate that is formed = 45/134.5 * 187.5 g

The mass of copper (II) nitrate that is formed = 62.7 grams

Percent yield = 58/62.7 * 100%

Percent yield = 92.5 %

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The balanced equation for the reaction of benzoic acid with hydroxide ion is:

C7H6O2 + OH- -> C7H7O2- + H2O

It is necessary to extract the ether layer with sodium hydroxide because in many organic synthesis reactions, the product is often insoluble in the reaction mixture and may separate as a solid or as an immiscible liquid layer.Sodium hydroxide is often used for this purpose because it helps to dissolve the organic product and make it more accessible for further purification or analysis.

A balanced equation has the same number of atoms of each element in the reactants as in the products. This is achieved by adjusting the coefficients in front of the chemical formulas to represent the correct ratio of reactants to products. The coefficients in a balanced equation also represent the stoichiometry, or the ratios of the amounts of reactants and products that react and form in a chemical reaction.

Balancing chemical equations is an important aspect of chemistry, as it allows us to understand the underlying reaction mechanisms and predict the yield of the reaction products. A balanced equation is also necessary for the calculation of energy changes in a reaction, and for the prediction of reactant and product concentrations over time.

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The average atomic mass of elements 208A and 204A is 206.17 g/mol.

The average atomic mass shows the relationship between the mass and the number of atoms in a common sample of an element.

Isotope 208A

Isotope 204A

Formula:

Average atomic mass = (Mass x Abundance)₁ + (Mass x Abundance)₂/100

Average atomic mass = (207.98 x 55) + (203.97 x 45)/100

Average atomic mass = 11438.9 + 9178.65/100

Average atomic mass = 206.17

So, the answer is 206.17 g/mol

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When a protein molecule is generated as a complex of many polypeptide chains, the entire structure is referred to as the quaternary structure. The overall three-dimensional organization of a polypeptide chain.

A polypeptide chain's structure is a linear arrangement of amino acids. Peptide bonds hold each amino acid to the one before it. In cells, there are 20 different kinds of amino acids. The core carbon of each amino acid is joined to an amino group, a carboxyl group, and a variable called the R group.

Proteins are frequently classified as globular or fibrous forms based on their tertiary structure. Fibrous proteins feature long, rope-like structures that are robust and hydrophobic, like -keratin. Immunoglobulins and plasma proteins are more hydrophilic and spherical than globular proteins.

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No, since the biochemical system gains energy, it does not have enthalpy favored.

Urea dissolves quickly in liquid, making it a good choice for enthalpy change measurements during dissolution. Entropy is the process' driving force since it is endothermic and spontaneous.

If stronger bonds are created than are broken, if a stronger acid or base is generated in the result, or if more molecules are produced, processes will be thermodynamically beneficial. Other examples include when more molecules are produced.

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Answer: exothermic

Explanation: The key is to look at the enthalpy (-136kJ/mol). Since it’s negative, the reaction is losing heat, therefore it’s exothermic.

the volume of 0.250 moles of propionic acid is 0.257 mL.

The density of a substance is a measure of its mass per unit volume, and it is usually expressed in units of grams per milliliter (g/mL). To find the volume of a substance, we can divide its mass by its density. In this case, we have the formula mass of propionic acid, which is 74.08 g/mol, and its density, which is 0.9880 g/mL.

To find the volume of 0.250 moles of propionic acid, we first need to find its mass. We can do this by multiplying the number of moles (0.250) by the formula mass (74.08 g/mol):

0.250 moles × 74.08 g/mol = 18.52 g

Once we have the mass, we can then find the volume by dividing the mass by the density:

18.52 g / 0.9880 g/mL = 18.52 g / 0.9880 mL = 0.257 mL

Therefore, the volume of 0.250 moles of propionic acid is 0.257 mL.

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Answer:

Explanation:

A material through which electrons can move easily is referred to as a conductor. Conductors have a high electrical conductivity, which means that electrons can flow through them with relative ease. This is due to the presence of free electrons in the material, which are not tightly bound to individual atoms. Examples of common conductors include metals such as copper, aluminum, and gold.

The vapor pressure at 298 K for this solution is 117.80 Torr.

By the formula of Raoult's law:

P pure sv° - P sl = P pure sv° . X (molar fraction)

ΔP = P pure sv° . X (molar fraction)

122.7 Torr - P sl = 122.7 Torr . X

Molar mass urea CO(NH₂)₂ = 60.06 g/m

Molar mass methanol = 32.04 g/m

Moles for urea: 15.2 g /  60.06 g/m = 0.253 moles

Moles for methanol: 196 g / 32.04 g/m = 6.117 moles

X (molar fraction) = moles from solute / moles from solute + moles from solvent

X (molar fraction) = 0.253 / 0.253 + 6.117 = 0.04

122.7 Torr - P sl = 122.7 Torr . 0.04

122.7 Torr - 4.908 Torr = P sl

117.80 Torr = P sl

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A violent change in weather occurs as the cold air mass digs underneath the warm air mass creating thunderstorms and snowstorms in the winter.

Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy.On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the troposphere,just below the stratosphere.

Weather refers to day-to-day temperature, precipitation, and other atmospheric conditions, whereas climate is the term for the averaging of atmospheric conditions over longer periods of time.When used without qualification, "weather" is generally understood to mean the weather of Earth.

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Evaporation removes a larger amount of salt then freezing does.

Evaporation can remove saltiness from a water body. When water evaporates, the water molecules with a lower concentration of salt are more likely to escape into the atmosphere, leaving behind the water molecules with a higher concentration of salt. Over time, this process can result in a higher concentration of salt in the remaining water, making it saltier.

This is the basic principle behind the process of solar evaporation, which is used to obtain salt from saltwater. The saltwater is placed in large, shallow ponds and allowed to evaporate, leaving behind the salt crystals that are then harvested.

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The equilibrium of a Bronsted-Lowry acid-base reaction will favor the formation of the stronger acid and base if both the reacting acid and base are strong.

This means that the ratio of the concentrations of the products to reactants will be higher, and the reaction will be shifted toward the side containing the stronger acid and base.

The Bronsted-Lowry definition of acids and bases is one of the most commonly used in chemistry. According to this definition, an acid is a substance that can donate a proton (H+) to another substance, while a base is a substance that can accept a proton. The reaction between an acid and a base is called a neutralization reaction and results in the formation of a salt and water.

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In a Bronsted-Lowry acid-base reaction [1], equilibrium will favor the formation of the stronger acid and base if the reacting acid and base are both strong. Multiple Choice:

A) Reactants

B) Weaker Reactants

C) Stronger Products

D) Weaker Products

E) Stronger

Answer: trenta (31 ounces).

Explanation:

The volume (in ml) of the 1.382 m stock naoh solution needed to prepare 250.0 ml of 0.1325 m dilute naoh solution is 23ml.

The equation you need is

M1V1 = M2V2

My personal preference is to convert volumes to Liters.

M1= 1.326 M

M2 = 0.1239 M

V1 = X L

V2 =  250 mL = 0.25 L

V1 = M2V2/  M1     =  0.1239 M(0.25 L)/  1.326 M  = 0.023 L = 23 mL

The number of moles per litre of solvent is the definition of concentration. Calculating moles involves dividing mass by molar mass. when a specific number of moles of NaOH dissolve in a specific number of litres of a solvent Concentration is then calculated as follows: moles of NaOH/liters of solvent.

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If more solvent than necessary is used during a recrystallization, the recovery of the desired product will be lower. This is because more of the product will be dissolved in the extra solvent, resulting in lower yields.

Additionally, the presence of the extra solvent could also lead to contamination of the product, further reducing the amount of the desired product recovered.

Furthermore, the extra solvent could affect the solubility of the desired product, resulting in an incomplete recrystallization and a lower recovery rate of the desired product.

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In the molecules given, the shortest carbon-carbon (C-C) distance is typically found in molecule "b" (H-C=C-H). Option B is correct.

The shortest carbon-carbon (C-C) distance is found in H-C=C-H. This is because the double bond between the two carbon atoms in this molecule will requires the carbon atoms to be closer together than in the other molecules.

In general, double bonds give result in a shorter C-C distance as compared to single bonds. This is due to the increased electron density in the region between the two atoms in a double bond, which strengthens the bond as well as pulls the atoms closer together.

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The total pressure exerted by a mixture containing two gases if the partial pressure of one gas is 70 torr and the partial pressure of the other gas is 30 torr is 100 torr.

The sum of the partial pressures equals the total pressure.Total pressure therefore equals 70 plus 30 to equal 100 torr.As a result, a mixture of two gases exerts a total pressure of 100 torr.

The answer to the above question is F=mg, where F seems to be the gravity gradient, m is the body's mass, and g seems to be the acceleration brought on by gravity.We are aware that P=FA, where P is a body's pressure, F is a force on the body, and A seems to be the force's area of action

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True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

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Answer:

D- 0.06 M

Explanation:

using the dilutions formula m1v1=m2v2 we can substitute the values.

note- 1l=1000ml

1(60)=m2(1000) and solve for m2 via algebra you get .06 M

The right options are b, c and e. a) The solid form of oil is denser than the liquid form. b) Water exhibits the highest amount of adhesion. e)Alcohol is not very cohesive.

The solid form of oil is denser than the liquid form:

Oil is denser in its solid state than it is in its liquid state.

The strongest adhesion is found in water.

A substance's density is a measurement of how heavy it is in relation to its size. API measures oil density, which can be estimated using formulas that take oil density into account. The more thick or heavier the oil, the lower the API.

Viscous heavy oil is available with more additives and a somewhat different chemical make-up. Therefore, liquid oil may have a different density than solid oil, but it will still be lighter.

Water exhibits the highest amount of adhesion:

Important water qualities like adhesion and cohesion have an impact on how water behaves everywhere, from plant leaves to your own body.

Alcohol is not very cohesive:

Alcohol is not a particularly strong unifier. The scientists have looked at a variety of alcohol and water mixes. They demonstrate that the specific heat of these mixes is greater than the specific heat of water itself, up to an alcohol strength of roughly 36%.

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Full question:

which of the following conclusions were found in the experiment? select all that apply. check all that apply.

a) The liquid form of water is less dense than the solid form.

b) The solid form of oil is denser than the liquid form.

c) Water exhibits the highest amount of adhesion.

d) Alcohol has a high heat capacity.

e) Alcohol is not very cohesive.

The hybridization at each carbon atom in the molecule is Cabon-1 = SP^2, Cabon-2 = SP^2, Cabon-3 = SP^3, Cabon-4 = SP, Cabon-5 = SP, Cabon-6 = SP^3

Hybridization is the mixing of atomic orbitals to form a new set of hybrid orbitals with different energy levels and geometries. This concept is used to explain the bonding and molecular structure of molecules, particularly in organic chemistry. The process of hybridization occurs when atoms share electrons in chemical bonds, and the resulting hybrid orbitals are used to explain the bonding patterns in molecules.

There are several types of hybridization, including sp3 hybridization, sp2 hybridization, and sp hybridization, which are determined by the number of orbitals involved in the hybridization process. Each type of hybridization results in different molecular shapes and bond angles, and these molecular structures are important in determining the physical and chemical properties of the molecule.

Hybridization plays a crucial role in understanding chemical bonding and the molecular structure of compounds. It provides a way to explain the behavior of molecules and the chemical reactions they undergo, and helps to explain the reactivity, stability, and properties of various compounds.

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If we need to make 120 g of lithium hydroxide [tex]LiOH[/tex], 350 grams of [tex]Li_{3}N[/tex] must react with excess water. Option B is correct answer.

The reaction equation for the production of lithium hydroxide ([tex]LiOH[/tex]) is:

[tex]Li + H_{2}O[/tex] → [tex]LiOH[/tex]

The balanced equation is:

[tex]2Li + H_{2}O[/tex] → [tex]2LiOH + H_{2}[/tex]↑

The no of moles of [tex]LiOH[/tex] required to make 240 g of [tex]LiOH[/tex] can be calculated using the molar mass of [tex]LiOH[/tex] (23.9 g/mol). The number of moles of Li required can then be calculated using the reaction's stoichiometry.

The amount of Li that must be reacted with excess water can be calculated given the amount of [tex]LiOH[/tex] required.

Option (a) 117 g of Li is insufficient to react and produce 240 g of [tex]LiOH[/tex]. Option (c) uses too much Li, and excess Li is left over after the reaction. Option (d) contains 1,050 g of Li, which is also excessive.

Option (b) 350 g of Li is the correct answer because this amount will react with water to produce the desired amount of [tex]LiOH[/tex].

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COMPLETE QUESTION:

Consider the following reaction

[tex]Li3N (s) + 3H2O (l) -- > NH3 (g) + 3LiOH (l)[/tex]

If you need to make 120 g [tex]LiOH[/tex], How many grams of [tex]Li_{3}N[/tex] must you react with excess water?

a. 117 g

b. 350 g

c. 700 g

d. 1,050 g

Answer:

Holding

Explanation:

because it's making a sense

Approximately 43.8 years must pass to reduce a 25 mg sample of cesium-137 to 8.7 mg.

The half-life of cesium-137 is 30.0 years, which means that after 30 years, half of the original amount of cesium-137 will have decayed into a different element.

Let's call the original amount of cesium-137 N. After one half-life, the amount remaining will be N/2. After two half-lives, the amount remaining will be N/2^2 = N/4. And so on.

In this case, we want to know how many half-lives must pass to reduce a 25 mg sample of cesium-137 to 8.7 mg. To find out, we can divide the final amount by the initial amount and take the logarithm base 2:

log2(8.7 mg / 25 mg) = x

x = log2(0.348) = -1.46

So, x half-lives have passed, where x is a negative number. To convert x to years, we multiply by the half-life:

-1.46 * 30 years/half-life = -43.8 years

this is an estimate based on the half-life, and the actual amount of cesium-137 remaining after a given amount of time may be slightly different.

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Chemical reactions contain breaking chemical bonds among reactant molecules (debris) and forming new bonds between atoms in product particles (molecules).

A balanced chemical equation occurs whilst the range of the atoms involved in the reactants facet is equal to the number of atoms in the goods aspect.

A chemical response is a manner that leads to the chemical transformation of 1 set of chemical substances to any other. Classically, chemical reactions embody modifications that handiest involve the positions of electrons inside the forming and breaking of chemical bonds among atoms, without exchange to the nuclei (no change to the factors gift), and may regularly be described with the aid of a chemical equation. Nuclear chemistry is a sub-area of chemistry that involves the chemical reactions of risky and radioactive elements where both electronic and nuclear modifications can arise.

The substance (or materials) initially worried in a chemical reaction are called reactants or reagents. Chemical reactions are commonly characterized by using a chemical trade, and they yield one or greater merchandise, which usually have residences exclusive from the reactants. Reactions often encompass a sequence of man or woman sub-steps, so-referred to as fundamental reactions, and the statistics on the correct path of movement are part of the response mechanism.

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When used to extract gold, the hazardous chemical cyanide causes damage to the environment.

Low concentrations of cyanides can be discovered in the environment and in goods that we frequently use and consume. Certain bacteria, fungus, and algae can generate cyanides. Additionally, cyanides can be found in things like tapioca, spinach, wood shoots, pistachios, lima beans, fruit shells, and car exhaust.

The quantity of cyanide someone individual is subjected to, the exposure, and the duration of exposure all affect how severely they are poisoned by it. The greatest harmful effects of cyanide come from inhaling the gas, however cyanide can also be hazardous when ingested.

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