Which of the following statements describes a difference between a chemical change and a physical change in a substance

Answer:

hope it helps and thank you for the points

The milliliters (ml) of a 0.125 mol/l nano3 solution required to make 500.0 ml of 0.075 mol/l nano3 solution is 400.0 mL

To calculate this,  Apply below Formula:

Amount (mL) = Desired Concentration (mol/L) x Volume (mL) / Initial Concentration (mol/L)

In this case, we have:

Desired Concentration (mol/L) = 0.075 mol/L

Volume (mL) = 500.0 mL

Initial Concentration (mol/L) = 0.125 mol/L

Therefore, the amount (mL) of 0.125 mol/L nano3 solution required to make 500.0 mL of 0.075 mol/L nano3 solution is:

Amount (mL) = 0.075 mol/L x 500.0 mL / 0.125 mol/L = 400.0 mL.

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Answer:

There is one mole in 6.02*10^23 particles of anything ( also CO2)

The total change in entropy is equal to the sum of heat transfer (in Joules) divided by the absolute temperature (in Kelvin) of the system. In equation form, the total change in entropy (ΔS) is equal to the sum of heat transfer (Q) divided by the absolute temperature (T):  ΔS = Q/T.

Entropy is the measure of randomness in a macroscopic system. It is equal with the ratio of heat absorbed in Joules (Q) and the temperature at which the heat is absorbed in Kelvin (T). If one wants the entropy to decrease, they must transfer the energy from outside the system.

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The concentration (M) of sodium ions in a 0.268 mol/L Na3P solution can be calculated by considering the stoichiometry of the compound. The concentration of sodium ions in the 4.57 L Na3P solution is 0.268 M

In this case, the concentration of Na3P is 0.268 mol/L, and the volume of the solution is given as 4.57 L. Multiplying these values together gives us the number of moles of Na3P in the solution, which is 1.225 mol. Since there are three sodium ions per molecule of Na3P, the number of moles of sodium ions is also 1.225 mol.

To find the concentration of sodium ions, we divide the number of moles of sodium ions by the volume of the solution. Therefore, the concentration of sodium ions in the 4.57 L solution is 1.225 mol / 4.57 L = 0.268 M.

In summary, the concentration of sodium ions in the 4.57 L Na3P solution is 0.268 M, obtained by considering the stoichiometry of Na3P and dividing the number of moles of sodium ions by the volume of the solution.

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Answer:

The correct answer is - 2Cu + 4HBr → 2H[CuBr2] + H2

Explanation:

Copper (Cu) and hydrobromic acid (HBr), which is a dissolved form of hydrogen bromide in the water, react and produce hydrogen dibromidocuprate (I) and hydrogen molecules.

The complete and balanced equation is -

2Cu + 4HBr → 2H[CuBr2] + H2

This reaction takes place in the medium of ester. Copper is in the suspension form in this reaction.

Thus, the correct answer is - 2Cu + 4HBr → 2H[CuBr2] + H2

The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.

Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.

There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.

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Answer:

Lithosphere plate boundaries are found in that area.

Explanation:

Answer:

C is the right answer

Explanation:

Answer:

3532.8

Explanation:

To determine the exact value of pK2 in this case, we can use the relationship between pH and pK, which states that the pH of a solution is equal to the pK of the acid with the lowest concentration when the acid and its conjugate base are in equilibrium.

Here, we know that the pH of the solution dropped from 8.00 to 3.20 after the addition of HCl. We can assume that the second group is now in the acid form since we know that the first ionizable group has a pK of 3.8, and the second group (pK2) is between 7 and 10, we can assume that the second group is now in the acid form.

We can use the relationship between pH and pK to calculate the exact value of pK2:

pH = pK2 = pKw / [H+] = 14.00 - log([H+])

3.20 = 14.00 - log([H+])

Solving for [H+], we find that [H+] = 1.0 x 10^-3.2

Now we can find the value of pK2 as:

pK2 = 14.00 - log(1.0 x 10^-3.2) = 14.00 - (-3.2) = 14.00 + 3.2 = 17.2

Therefore, the exact value of pK2 is 17.2.

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Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:

pOH= - log (1.20×10⁻⁷ M)

Solving

pOH= 6.92

Then, pH is calculated as:

pH + 6.92= 14

pH= 14 - 6.92

pH= 7.08

Finally, the solution has a pOH of 6.92 and a pH of 7.08.

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Answer:

a because two substances form a new substance

Explanation:

Answer:

A is the chemical reaction because  we can see rearrangement of the ionic structure of a substance, new bonds are forming up that results in the change in physical and chemical properties

The effective multiplication factor k=0.94.

What is reactivity ?

Being responsive as a trait or state. Chemistry. the resemblance of an atom's, molecule's, or radical's ability to interact chemically with another atom, molecule, or substance.

What is reactor?

Reactor: A vessel or equipment used in chemical engineering to conduct chemical reactions for research or production.

(a) The effective multiplication factor  k=0.94

The reactivity \rho = \frac{k-1}{k}=-0.0638.

(b) For the reactor to be critical, k = 1, which means the core reactivity should be increased to make it critical.

Therefore, the effective multiplication factor k=0.94.

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Nuclear Fusion is the reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles

The tiny, compact area of protons and neutrons at the heart of an atom is known as the atomic nucleus. The strongest known basic force, often known as the strong force, is what holds these things together. Despite making up far less than.01 percent of the atom's volume, the nucleus normally takes up more than 99.9% of its mass.

Within a few minutes after the Big Bang, nucleosynthesis started. Protons and neutrons were then formed from a quark-gluon plasma, a concentrated soup of quarks and gluons. The neutron-proton merger produced the deuterium isotope's nuclei after the cosmos somewhat cooled. Protons and neutrons make up every atomic nucleus, and the quantity of protons determines the size of the nucleus.Each chemical element has different isotopes, which are determined by the chemical element and the neutron count.

Nuclear Fusion Is A Reaction In Which Two Or More Atomic Nuclei Are Combined To Form One Or More Different Atomic Nuclei AND SUBATOMIC PARTICLES.

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Answer: In everyday life, for example on food packaging, the word ‘pure’ usually means that something is in its natural state without anything added to it, like sweeteners or preservatives. Natural fruit juice is made up of sugar, water, and many other naturally occurring chemicals. In chemistry, this is not considered 'pure' and is a mixture.

Explanation:

Answer:

Explanation:

Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. If an object has kinetic energy, then it is moving. Many students confuse kinetic energy with potential energy.

Answer:

A. its reactivity

Explanation:

It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air

Answer:

A.  reactivity

Explanation:

Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

Water's ability to act as a good solvent is best explained by its polar nature. Water molecules are composed of two hydrogen atoms covalently bonded to an oxygen atom.

The oxygen atom has a higher electronegativity than the hydrogen atoms which gives the water molecule a slightly negative charge on the oxygen side and a slightly positive charge on the hydrogen side.

This polarity allows water molecules to interact with other polar molecules, forming hydrogen bonds and allowing them to dissolve a variety of substances. The hydrogen bonds form between the oxygen of one molecule and the hydrogen of another, allowing water molecules to surround and interact with the molecules of the substance being dissolved.

This polarity also allows water molecules to move freely making them highly mobile, allowing them to form a homogeneous solution with the dissolved substances. This ability of water to dissolve a variety of substances is what makes it a good solvent.

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The kind of inhibitor a compound named P56 is a competitive inhibitor. The correct answer is C.

Competitive inhibition occurs when an inhibitor binds to the active site of an enzyme, preventing the substrate from binding and thus inhibiting the enzyme's activity. This type of inhibition can be overcome by increasing the concentration of the substrate, as the substrate will eventually outcompete the inhibitor for the active site.

In contrast, uncompetitive inhibition occurs when an inhibitor binds to the enzyme-substrate complex, preventing the reaction from proceeding.

Mixed inhibition occurs when an inhibitor can bind to both the enzyme and the enzyme-substrate complex, inhibiting the reaction in both cases.

Noncompetitive inhibition occurs when an inhibitor binds to a site other than the active site, causing a change in the enzyme's shape that prevents it from functioning properly.

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The pH of the HCl solution made by adding 0.878 moles HCl to water that has a total volume of a solution of 1855ml is 0.33.

To find the pH of the solution, follow these steps:

1. Calculate the concentration of HCl in the solution: Divide the moles of HCl by the volume of the solution in liters.
0.878 moles HCl / (1855 mL * 0.001 L/mL) = 0.473 M (molar concentration)

2. Since HCl is a strong acid, it will dissociate completely in water to form \(H^+\) ions and \(Cl^-\) ions:
HCl(aq) →  \(H^+\)(aq) +  \(Cl^-\)(aq)

3. The concentration of  \(Cl^-\) ions in the solution will be equal to the concentration of HCl since it dissociates completely:
[ \(Cl^-\)] = 0.473 M

4. Use the formula for pH to find the pH of the solution:
pH = - \(log_{10}\) [ \(Cl^-\)]
pH = - \(log_{10}\) (0.473)

5. Calculate the pH:
pH ≈ 0.33

Therefore, the pH of the solution is approximately 0.33.

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In general, the arming time of a munition refers to the time required for the munition's fuse to become active and enable the explosive charge to detonate. The arming time can vary depending on several factors, including the type of fuse used, the specific munition model.

Tail fuzes like the M905 tail fuze are designed to be used with certain types of munitions, such as bombs, and are typically armed by the motion or rotation of the munition during its descent or trajectory. The arming time of a tail fuze can depend on several factors, including the munition's velocity, the altitude of the munition, and the specific settings on the fuze.

It's important to note that discussing specific arming times of military munitions is not recommended, as it can be considered sensitive information that should only be handled by authorized personnel with the proper clearance and training to ensure public safety and security.

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The value of Kb for the base is approximately 0.14. Subsequently, by applying the equilibrium expression for Kb, we can calculate the Kb value.

In this problem, we are given the concentration of a base solution (0.15 M) and the hydrolysis constant (a = 0.021, which represents the fraction of the base hydrolyzed). From this information, we can calculate Kb, which is the base dissociation constant.

The hydrolysis constant (a) is defined as the ratio of the concentration of hydrolyzed base ([OH-]) to the initial concentration of the base ([B]):

a = [OH-] / [B]

Since the concentration of hydrolyzed base ([OH-]) is equal to the concentration of hydroxide ions formed during hydrolysis, we can rewrite the equation as:

a = [OH-] / [B]

= [OH-] / (initial concentration of base - [OH-])

Given that a = 0.021 and [B]

= 0.15 M, we can substitute these values into the equation and solve for [OH-]:

0.021 = [OH-] / (0.15 - [OH-])

Rearranging the equation, we get:

0.021(0.15 - [OH-]) = [OH-]

Simplifying further:

0.00315 - 0.021[OH-] = [OH-]

0.00315 = 0.022[OH-]

Dividing both sides of the equation by 0.022, we find:

[OH-] = 0.143 M

Since Kb is the equilibrium constant for the dissociation of the base into hydroxide ions, we can use the concentration of hydroxide ions ([OH-]) to calculate Kb:

Kb = [OH-]^2 / [B]

Substituting the values, we get:

Kb = (0.143)^2 / 0.15

Kb ≈ 0.14

Therefore, the value of Kb for the base is approximately 0.14.

The Kb value for the base, calculated based on the given information, is approximately 0.14. The hydrolysis constant (a) of 0.021 represents the fraction of the base that undergoes hydrolysis, and by using this value, along with the initial concentration of the base, we can determine the concentration of hydroxide ions. Subsequently, by applying the equilibrium expression for Kb, we can calculate the Kb value.

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Answer:

Anhydrous copper sulphate.

Explanation:

In the presence of water anhydrous copper sulphate , a white powder, turns to blue.

Answer:

Explanations:

Given the following electronegativity of three elements as:

Answer:

can you put an image

Explanation:

Answer:

if my calculation are correct, it's 295 grams

Explanation:

because liters converted to grams is .1=100 so if you take 2.95 times 100, it equals 295

Answer:

In order to promote biodiversity, fight disease, and advance agriculture, soil is essential in the following ways:

Biodiversity: A variety of microbes, insects, and plants that make up intricate food webs live in soil. The diversity of the soil fosters the growth of plants, which in turn provide habitat and food for other organisms, and contributes to the stability of the ecosystem.

Fighting disease: Soil microorganisms compete with pathogenic organisms for resources and space and also produce antimicrobial chemicals, which helps to avoid plant diseases. Additionally, minimising tillage and increasing organic matter are two soil management techniques that can help lower the prevalence of plant diseases.

Agriculture: Soil supports crops physically, supplies them with vital nutrients, and controls the flow of air and water. Crop yields and quality can both rise with healthy soil and a balanced soil microbiota. Furthermore, sustainable agriculture can be supported by soil management techniques like cover crops and decreased tillage that preserve soil resources and maintain soil health.

The soil is home to a wide range of bacteria, insects, or plants that support complex food webs.

The bioactive, porous media that has grown in the top layer of the Earth's crust is known as soil. Being a source of water as well as nutrients, a filter for harmful wastes, a site for their breakdown, and a collaborator in the cycle of carbon as well as other substances through the planet's ecosystem, soil constitutes one of the main substrates of life on Earth.

In the following way soil contributes to biodiversity, fighting disease and agriculture. Biodiversity: The soil is home to a wide range of bacteria, insects, or plants that support complex food webs. Disease prevention: Soil microorganisms create antimicrobial compounds and compete against pathogenic organisms for nutrients and space, which helps prevent plant diseases. Agriculture: Soil provides crops with physical support, essential nutrients, and control over air and water flow.

Therefore, the soil is home to a wide range of bacteria, insects, or plants that support complex food webs.

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