calculate the ph during the titration of 20.0 ml of 0.25 m hbr(aq) with 0.25 m lioh after 20.79 ml of the base have been added.

Answer:

Sublimation

Explanation:

Sublimation refers to the process by which the change of matter takes place directly from solid to liquid state. The matter from the solid-state directly changes into the gaseous state without changing into the liquid state. More energy is required in this process. This is an endothermic reaction. Dry ice is the solid carbon dioxide sublimes in the air.

Answer:

Ice cream is not a pure substance. A pure substance consist of 1 particular element or compound only.

Explanation:

Ice cream is a mixture of substances but carbon dioxide is a compound of carbon and oxygen

The name of the process by which glucose is regenerated from lactate is called Cori cycle.

Cori cycle is the metabolic pathway in which lactate produced by anaerobic glycolysis in the muscles moves to the liver and is converted to glucose, which then returns to the muscles and is metabolized back to lactate.

This process was named after its discoverers as follows; Carl Ferdinand Cori and Gerty Cori.

The Cori cycle is a way to bring energy to the muscles during intense workouts and other times of lower oxygen levels in the body.

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Answer:

Explanation:

pls mark brainliest

a. The limiting reactant is CaO. The maximum mass of calcium carbide (CaC₂) that can be formed is approximately 214.185 grams.

To determine the limiting reactant and the maximum mass of calcium carbide (CaC₂) that can be formed, we need to compare the amounts of CaO and C and determine which reactant will be completely consumed first.

Let's start by writing the balanced chemical equation for the reaction:

CaO + C → CaC₂ + CO

Now, let's calculate the number of moles for each reactant using their respective molar masses:

Molar mass of CaO = 56.08 g/mol

Molar mass of C = 12.01 g/mol

Number of moles of CaO = 188.00 g / 56.08 g/mol = 3.35 mol

Number of moles of C = 123.00 g / 12.01 g/mol = 10.25 mol

According to the balanced equation, the stoichiometric ratio between CaO and C is 1:1. This means that 1 mole of CaO reacts with 1 mole of C to form 1 mole of CaC₂.

Since the stoichiometry is 1:1, we can determine that the limiting reactant is CaO because there are fewer moles of CaO compared to C. In this case, CaO will be completely consumed, and C will be left in excess.

Now, to calculate the maximum mass of CaC₂ that can be formed, we use the number of moles of CaO as the limiting reactant and convert it to grams using the molar mass of CaC₂:

Molar mass of CaC₂ = 64.10 g/mol

Maximum mass of CaC₂ = 3.35 mol × 64.10 g/mol = 214.185 g

Therefore, the maximum mass of calcium carbide (CaC₂) that can be formed is approximately 214.185 grams.

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Answer:

P2 = 2.25 atm

Explanation:

Given:

V1 = 1.5 L. V2 = 2.0 L

P1 = 3.0 atm. P2 = ?

Use Boyle's law and solve for P2:

P1V1 = P2V2

or

P2 = (V1/V2)P1

= (1.5 L/2.0L)(3.0 atm)

= 2.25 atm

Answer:

Since the ions cannot move, ionic solids are non-conductors of electricity. When the solid is melted to a liquid, however, the ions are free to migrate. Therefore, ionic liquids are good conductors of electric current. A conductor is a substance capable of transmitting electricity and/or heat.

Explanation:

:)

No, \(PCI_3\)  is not a good conductor.

Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. A colourless liquid when pure, is an important industrial chemical, being used for the manufacture of phosphates and other organophosphorus compounds.

The liquid does not conduct electricity because of the lack of ions or mobile electrons.

Hence, no, \(PCI_3\) is not a good conductor.

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Answer:

Explanation:

The intermolecular forces are stronger in Iodine, meaning that its molecules are stronger and can hold that solid structure at room temperature, where Bromine cannot due to its IMF's being weaker.

The following equation serves as the first order reaction speed law:

k = -1 * (d[A] / dt) * (1 / [A]

Where k is the speed constant, [A] is the reactivo concentration, and (d[A] / dt) is the rate of change of the concentration with respect to time.

We may rearrange this equation to obtain an expression that allows us to calculate the time it takes for a reactivo to go from an initial concentration of [A]0 to an end concentration of [A]:

t = (1/k)*ln([A]0/[A])

Where the natural function of logic is.

By substituting the values given in the question, we have:

k = 2.5 × 10^-3 s^-1 \s[A]

₀ = 0.15 M \s[A] = 0.0375 M

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Answer: An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.

Explanation: I think ;>;

Answer:

Heating raw potatoes in hot water will make the starch granule swell and absorb water, becoming soft and easier to digest. Eggs contain mostly protein in liquid form. Heating protein will make it undergo denaturation process. The protein structure changes, becoming firm solid and easier to digest.

Explanation:

A because A galvanic cell consists of two half-cells, such that the electrode of one half-cell is composed of metal A, and the electrode of the other half-cell is composed of metal B; the redox reactions for the two separate half-cells are thus: An+ + ne− ⇌ A.

Answer:

A

Explanation:

The majority of people consider the concept of incorporeal substance to be nothing more than a figment of our imaginations.

The ancient Greeks proposed that the universe is made up of atoms and void. According to this notion, nothing else exists. Incorporeal substance is therefore a complete absurdity.

Incorporeal substance: The notion of incorporeal substance means that substance, unlike the physical, cannot be perceived by the senses. Spirit, mind, soul, and God are all incorporeal substances. There are several objections to this argument, but the most intriguing one is whether incorporeal substances have a place in the world.

As a result, the concept of incorporeal substance is seen as a total absurdity. Some people believe that anything that exists must be material, or that the material universe is all that exists, and they deny the existence of immaterial objects like ideas or spirits.

In summary, because the notion of incorporeal substance contradicts the principle that nothing exists besides atoms and void, it is considered an absolute absurdity. The question of whether incorporeal substances are present in the world is still up for debate, and there are several differing viewpoints on the issue.

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Atomic radius generally decreases from left to right across a period because the effective nuclear charge Increases while electrons are being added to the same outer level. These additional electrons are shielded less well by inner electrons and are therefore attracted more strongly by the nucleus. .

In the periodic table, atomic radii generally decrease as you move left to right across the period (because the nuclear charge increases) and increase as you move down the group (because the number of electron shells increases).

As the attractive force between the nucleus and the electron increases, the size of the atom decreases. This effect diminishes as you move further to the right within the cycle. This is due to repulsion between electrons that would otherwise cause the atoms to increase in size.

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Answer:

0.890J/gC

Explanation:

H=mcDeltaT --> c=H/mDeltaT

c= 222.5J/(25.0)(10.0)

222.5/250

0.890J/gC

The mole fraction of hydrochloric acid (HCl) in the solution is approximately 0.460.

Molality (m) is defined as the number of moles of solute per kilogram of solvent. In this case, the molality of HCl is given as 8.56 mol/kg. Mole fraction (X) is defined as the ratio of the moles of a component to the total moles of all components in the solution.

To calculate the mole fraction of HCl, we need to know the total number of moles in the solution. However, the information provided only gives the molality of HCl, which provides the moles of HCl per kilogram of solvent, but not the total moles of the solution. Without the total moles of the solution, it is not possible to directly calculate the mole fraction of HCl. Therefore, based on the given information, it is not possible to determine the mole fraction of HCl in the solution accurately.

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Answer:

\(Au+ 3HCl + HNO_3 \to AuCl_3+NO+2H_2O\)

Explanation:

Chemical Equations are representations of chemical reactions in terms of the symbols and formulae of the elements and compounds involved. A chemical equation usually have the reactant at the left hand side while the product is on the right hand side.

A chemical Equation is of little or no value if is not in balanced equation. When an equation is balanced , the total number of atoms of any element on the left-hand side of it must be equal to the total number of atoms of that element on the right hand side.

in the given question; we are given a word problem of chemical symbol to  compute and also to balance the chemical equation.

From below; the chemical equation can be written as:

\(Au+ HCl + HNO_3 \to AuCl_3+NO+2H_2O\)

From the above  equation we will notice  that  it is not truly balanced ; so th balanced equation can be written as:

\(Au+ 3HCl + HNO_3 \to AuCl_3+NO+2H_2O\)

The two critical factors for the existence of the carbon dioxide cycle on Earth are photosynthesis and respiration.

Photosynthesis is the process by which plants and other organisms convert carbon dioxide into oxygen through the use of sunlight. Respiration is the opposite process, where organisms use oxygen and produce carbon dioxide as a waste product.

Without these two processes, the carbon dioxide cycle would not be able to function properly, leading to an imbalance in atmospheric gases and potentially negative impacts on the environment.

Two critical factors for the existence of the carbon dioxide (CO2) cycle on Earth are biological processes and geophysical processes.

Biological processes play a vital role in the carbon cycle by regulating the exchange of CO2 between the atmosphere and living organisms. Through photosynthesis, plants and other autotrophic organisms convert atmospheric CO2 into organic carbon compounds, releasing oxygen as a byproduct.

This process, coupled with respiration by organisms, determines the balance of CO2 in the atmosphere. Additionally, decomposition of organic matter by microorganisms returns CO2 back into the atmosphere. The interplay between photosynthesis, respiration, and decomposition maintains the equilibrium of carbon in the biosphere.

Geophysical processes are equally essential for the CO2 cycle. Carbon dioxide is constantly exchanged between the atmosphere, oceans, and landmasses. The oceans act as a significant sink for CO2, absorbing a considerable portion of the atmospheric carbon.

This process, known as oceanic uptake, relies on the solubility of CO2 in seawater. Geological processes, such as weathering and volcanic activity, also contribute to the carbon cycle. Weathering of rocks releases carbon dioxide into the atmosphere, while volcanic eruptions release stored CO2 from Earth's interior.

The combination of biological and geophysical processes maintains the balance of carbon dioxide in the atmosphere, regulating Earth's climate and supporting the functioning of ecosystems. Any disruptions to these processes can have significant consequences for the CO2 cycle and the overall stability of the planet's climate.

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The wavelength of the first line (n=4 to n=3) in the Balmer series is 656.3 nm. The wavelength of the second line (n=4 to n=2) in the Balmer series is 486.1 nm. The wavelength of the third photon, calculated above, is 594.1 nm.

The hydrogen atom has a single electron in its shell. Electrons in a hydrogen atom have a set of allowed energy levels. The ground state has the lowest energy level, and n represents the electron's energy level in the hydrogen atom.

Electrons gain energy and rise to a higher energy level when they are stimulated by energy from an external source such as an electric current or a photon beam.The hydrogen atom is said to be excited when its electron absorbs energy and rises to a higher energy level.

The excited atom then emits the energy in the form of electromagnetic radiation, which includes visible light and other wavelengths.The hydrogen atom has a characteristic spectrum due to the transitions between its energy levels. The wavelengths of photons absorbed or emitted when electrons in a hydrogen atom move between energy levels are determined by the following equation:

E=(hc)/λ whereE = energy of the photonh = Planck's constanctc = speed of lightλ = wavelength of the photonLet us now determine the wavelengths of the other two photons. When a hydrogen atom is excited from its ground state to the n=4 state, it emits a series of spectral lines known as the Balmer series.

The Balmer series is a series of lines in the visible light region of the spectrum. The wavelength of the first line (n=4 to n=3) in the Balmer series is 656.3 nm. The wavelength of the second line (n=4 to n=2) in the Balmer series is 486.1 nm.The third photon's wavelength can be calculated as follows

:Energy of the photon = (hc)/λEnergy of the photon = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (1882 x 10^-9 m) = 3.328 x 10^-19 JThe wavelength of the third photon is calculated as follows: Energy of the photon = (hc)/λ3.328 x 10^-19 J = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / λλ = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (3.328 x 10^-19 J)λ = 594.1 nmThe first two wavelengths are given by the Balmer series.

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Answer:

With an 18-carbon backbone, stearic acid is a saturated long-chain fatty acid.

What is Stearic Acid?

With an 18-carbon chain, stearic acid is a saturated fatty acid. Octadecanoic acid is the substance's IUPAC name. It has the chemical formula C₁₇H₃₅CO₂H and is a waxy solid. The word "stear," which means tallow in Greek, is where it gets its name. Stearates are the names for the salts and esters of stearic acid. The second most prevalent saturated fatty acid in nature after palmitic acid is stearic acid, which serves as its ester. [11] Stearin is the triglyceride produced when three molecules of stearic acid are combined.

Explanation:

Animal fat contains more stearic acid than vegetable fat does. The foods cocoa butter and shea butter are the notable exceptions because they contain stearic acid (as a triglyceride).

In terms of its biosynthesis, acetyl-CoA contributes two-carbon building blocks to the fatty acid synthesis machinery, which converts carbohydrates into stearic acid.

The triglycerides in fats and oils are saponified with hot water to produce stearic acid. After that, the resulting mixture is distillated.

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Answer:

The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water.

Explanation:

\(density = \frac{mass}{volume} \)

1. density = 57/300

= 0.19 g/ml

2. density = 57/12

= 4.75 g/ml

3. density = 15/3

= 5.0 g/ml

The temperature of the gas is 285 K

Boyle's law is a fundamental law of physics that describes the relationship between the pressure and volume of a gas at constant temperature. The law states that the pressure of a gas is inversely proportional to its volume, such that if the volume of a gas increases, its pressure decreases, and vice versa. Mathematically, this relationship is expressed as:

P * V = k (constant)

P1V1/T1 = P2V2/T1

P1V1T2 = P2V2T1

T2 = P2V2T1/P1V1

T2 =  675 * 940 * 273/760 * 800

T2 = 285 K

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Answer:

For every 1 Ca(NO3)2 there are six (2 * NO3 or 2 * 3 O) oxygens. If you have 3 mole of Ca(NO3)2 then you have 18 mole of oxygen atoms (3*6).

Explanation:

The internal energy of the gas is 10 J.

The internal energy of an ideal gas can be calculated using the equation U = (3/2) * n * R * T, where U is the internal energy, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

Given:

n = 0.40 mol

P = 0.50 atm

V = 50 L

To calculate the temperature, we can use the ideal gas law: PV = nRT.

Rearranging the equation, we get:

T = (P * V) / (n * R)

Substituting the given values, we have:

T = (0.50 atm * 50 L) / (0.40 mol * 0.0821 L·atm/(mol·K))

Calculating T, we find:

T ≈ 305.68 K

Now, we can calculate the internal energy using the equation:

U = (3/2) * n * R * T

Substituting the values, we get:

U = (3/2) * 0.40 mol * 8.314 J/(mol·K) * 305.68 K

Calculating U, we find:

U ≈ 10 J

The internal energy of the gas is approximately 10 J.

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Answer:

You can separate flour and rice using a sieve, but you won't be able to separate all of the flour from the rice since the flour is too small to see.

Explanation:

.