what is the value of for a mixture of polymer a (p = 9.0 (cal/cm3)0.5 ) and the solvent b (s = 7.5 (cal/cm3)0.5)? note: assume vs/rt = 1/6 and a fudge factor of 0.34 in corresponding units.

Answer:

This equation essentially states that the standard enthalpy change of formation is equal to the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. and the standard enthalpy of formation values: ΔH fo[A] = 433 KJ/mol.

Explanation:

Hope this helps.

When a metal is placed into an acid, a chemical reaction called a redox reaction occurs. In this process, the metal loses electrons (oxidation) and the acid gains electrons (reduction). This results in the formation of a salt and hydrogen gas is released. The general equation for this reaction is:

Metal + Acid → Salt + Hydrogen gas

For example, when zinc is placed into hydrochloric acid, the reaction is:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

In this reaction, zinc is oxidized to form zinc chloride (ZnCl₂) while hydrogen ions (H⁺) in the hydrochloric acid are reduced to form hydrogen gas (H₂).

The release of hydrogen gas can be observed as bubbles forming in the solution. This process demonstrates the reactivity of metals with acids, which depends on the metal's position in the reactivity series.

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We would expect a group of 86 aliens to have approximately 458 thumbs. If for every 3 aliens there are 8 hands, then we can find the total number of hands by dividing the number of aliens by 3 and multiplying by 8:

86 aliens / 3 aliens per group * 8 hands per group = 229.33 hands

However, since we are interested in the number of thumbs, we need to multiply the number of hands by 2 (since there are 2 thumbs per hand):

229.33 hands * 2 thumbs per hand = 458.67 thumbs

Since aliens are unlikely to have a fraction of a thumb, we should round down to the nearest whole number.

Therefore, we would expect a group of 86 aliens to have approximately 458 thumbs.

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The SI system unit for the amount of a substance is the mole (mol). The mole is a fundamental unit of measurement in chemistry, and it is used extensively in both theoretical and practical applications.

The mole (mol) is the SI system unit for the amount of a substance. It is used to calculate the quantity of an element in a compound or a specific substance in a chemical reaction. The mole is defined as the amount of a substance containing as many elementary entities (atoms, molecules, ions, or electrons) as there are atoms in exactly 12 grams of pure carbon-12.A mole is a counting unit, similar to a dozen or a gross. Just as a dozen refers to 12 items and a gross refers to 144 items, a mole refers to 6.02 x 1023 items. This number is known as Avogadro's number, and it represents the number of atoms, molecules, ions, or electrons in one mole of a substance. The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. The molar mass is the mass of one mole of a substance, and it is expressed in grams per mole (g/mol).The mole is an important concept in chemistry because it allows chemists to work with amounts of substances that are too small to see or weigh. It is also useful for balancing chemical equations and predicting the products of chemical reactions. The mole is a fundamental unit of measurement in chemistry, and it is used extensively in both theoretical and practical applications.

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Answer:

Jöns Jacob Berzelius is the founder of today's modern symbols for elements.

Antoine Lavoisier is the one who identified oxygen as part of air

Humphrey Davy pioneered  the field of electrochemistry.

Answer:

it is 55.84

Explanation:

it's 55.84 because that is the relative atomic mass of iron and iron is the formula for iron wool

An atom must fill its outermost electron shell with the maximum number of electrons possible to achieve maximum stability and become chemically inert.

Atoms seek to achieve a stable electron configuration by filling their outermost electron shell with the maximum number of electrons possible. This is known as the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a full valence shell of eight electrons.

Noble gases, such as helium, neon, and argon, are examples of chemically inert elements as they have a full outermost electron shell and do not readily react with other elements. Elements in the same group on the periodic table tend to have similar chemical properties because they have the same number of valence electrons. Achieving a stable electron configuration is crucial for the formation of chemical bonds, which allow atoms to combine and form molecules.

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For an atom to achieve maximum stability and become chemically inert, it must achieve a filled outer electron shell. This can be accomplished through one of the following processes:

Gaining or losing electrons: Atoms can gain or lose electrons to achieve a filled outer shell, either by accepting electrons from other atoms (to become negatively charged ions) or by donating electrons to other atoms (to become positively charged ions).Sharing electrons: Atoms can form covalent bonds by sharing electrons with other atoms. This allows each atom to have a complete outer shell by sharing electrons with neighboring atoms.By achieving a filled outer electron shell, atoms can attain a stable electron configuration similar to that of the noble gases, which are known for their chemical inertness.

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Phases of small stars: Planetary nebula phase, White dwarf phase and Black dwarf phase. Phases of big stars: Red supergiant phase,  Supernova phase and Neutron star phase or Black Holes.

Most galaxies have stars distributed throughout them that are born within dust clouds. The Orion Nebula is a well-known illustration of a dust cloud of this type. Deep within these clouds, turbulence creates knots with enough mass for the gas and dust to start collapsing under its own gravitational pull. The material in the cloud's centre starts to heat up as it breaks up. This heated core at the centre of the collapsing cloud is referred to as a protostar and will eventually turn into a star.

The majority of the stars in the Milky Way are found in pairs or in clusters of several stars, which could be explained by the possibility that the spinning clouds of collapsing gas and dust split into two or three blobs.

The event horizon of a black hole is an area of spacetime where gravity is so intense that nothing, not even light or other electromagnetic waves, has the energy to cross it.  According to general relativity theory, a sufficiently compact mass can cause spacetime to distort and create a black hole.

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Answer:

average star → giant → planetary nebula → white dwarf

massive star → supergiant → supernova → neutron star (or black hole)

Explanation: plato

Answer:

Heat flows from the block at high temperature to the one with lower temperature

Explanation:

The direction of heat flow is from a body at higher temperature to one with a lower temperature.

Answer:

the answer options C

170 C no heat flow

Explanation:

Answer:

FeSO4 is the formula for iron(II) sulfate.

The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.

This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.

Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.

This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.

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Since water has a high specific heat, that results in water being able to store/require more energy in order to change it’s temperature. Since San Francisco is so close to water, that would mean that it’s temperature should vary less since water would be able to keep the temperature around the same value even if there was an increase or decrease in thermal energy.  

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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The emission of carbon that are avoided are called scope 4 Carbon emission.

The scope for Carbon emissions are those emissions of carbon which are reduced or avoided.

They can also be defined as the reductions that have occurred outside of a products complete cycle or the value chain.

The product cycle are those which are related to the manufacturing cycle of the carbon related products.

Collectively all the greenhouse emissions that are avoided or which are reduced to a very significant level are known as scope 4 emissions.

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Answer:

It is called a negatively charged ion

Answer: A anion or you can call it a ion

The difference between the value for hexane and the value for water can be explained by the type of intermolecular forces present in each substance.

Water has strong hydrogen bonding, which requires a significant amount of energy to overcome in order to vaporize the substance. Hexane, on the other hand, has weaker London dispersion forces, which require less energy to overcome. Therefore, the ΔHvap for hexane is lower than the ΔHvap for water.

In general, the stronger the intermolecular forces, the higher the ΔHvap will be. This is because more energy is required to overcome these forces and convert the substance from a liquid to a gas. Water has very strong intermolecular forces due to its ability to form hydrogen bonds, which are significantly stronger than the London dispersion forces present in hexane.

Overall, the difference between the ΔHvap values for hexane and water can be attributed to the difference in the strength of the intermolecular forces present in each substance. Water has stronger hydrogen bonding, which requires more energy to overcome, while hexane has weaker London dispersion forces, which require less energy to overcome.

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Noble gases have completely filled electronic configuration. Therefore, noble gases or group 18 elements are inert in nature.

Noble gases are 18th group elements in periodic table. They are all having complete filled electronic configuration. The group members are helium, neon, argon, krypton, xenon and radon.

All these elements are existing in gaseous state and they are unreactive. Atoms become reactive when they have extra electrons or are deficient of electrons. Thus to achieve octet, they bond with other atoms.

In the case of noble gases, the valence shell is already achieved octet and no need of lose or gain of electrons. Thus, they are generally inert.

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Respuesta:

2400 mL

Explicación:

Paso 1: Información dada

Paso 2: Calcular el volumen de naranja

La concentración de naranja es de 20 % v/v, es decir, cada 100 mL de solución hay 20 mL de naranja.

3000 mL Sol × 20 mL Naranja/100 mL Solución = 600 mL Naranja

Paso 3: Calcular el volumn de agua

El volumen de soluciónes igual a la suma de los volúmenes de naranja y agua.

VSolución = VNaranja + VAgua

VAgua = VSolución - VNaranja

VAgua = 3000 mL - 600 mL = 2400 mL

The pH of an aqueous solution at 25 °C that contains 3.98 x 10^-9 M hydronium ion can be calculated using the equation pH = -log[H3O+]. Substituting the given value of hydronium ion concentration into the equation, we get pH = -log(3.98 x 10^-9) = 8.4.

This means that the solution is basic, as the pH is greater than 7. At this pH, there are more hydroxide ions (OH-) present in the solution than hydronium ions (H3O+). This is because the pH scale is logarithmic, so each increase or decrease of one pH unit represents a tenfold change in acidity or basicity.

Understanding the pH of a solution is important in many fields, including chemistry, biology, and environmental science. It can affect the solubility and reactivity of substances, the function of enzymes and proteins, and the health of organisms and ecosystems. Thus, accurately measuring and controlling pH is essential for many applications, from wastewater treatment to medical diagnostics.

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Answer:

The table compares making ethanol by hydration of ethene (ethene and steam) to making ethanol by fermentation (sugar from plant material).

In a redox reaction at standard conditions, the values for Eº (of the cell) and ∆Gº must be Eº is positive and ∆Gº is negative for the cell to be spontaneous. The correct answer is option B.

In a spontaneous redox reaction, the standard cell potential (Eº) must be positive, indicating that the reaction is thermodynamically favorable. A positive Eº value indicates that the reaction proceeds in the forward direction as written.

Furthermore, the standard Gibbs free energy change (∆Gº) must be negative for a spontaneous reaction. A negative ∆Gº value indicates that the reaction has a tendency to proceed spontaneously, with the products having a lower free energy than the reactants.

Therefore, for a redox reaction to be spontaneous at standard conditions, Eº must be positive (indicating thermodynamic favorability) and ∆Gº must be negative (indicating spontaneity).

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In a redox reaction at standard conditions, the values for Eº (of the cell) and ∆Gº must be Eº is negative and ∆Gº is negative for the cell to be spontaneous.

The redox reaction consists of two half-cells, one is oxidation and the other is reduction. When both half-cells are connected, electrons are transferred from the half-cell that gets oxidized to the half-cell that gets reduced, producing a flow of electrons from the anode to the cathode. Electrons move from the half-cell with a lower standard electrode potential (Eº) to the half-cell with a higher standard electrode potential (Eº). The spontaneity of a redox reaction can be determined by the sign of Gibb's free energy change (∆Gº) and the standard electrode potential (Eº) of the redox reaction. If Eº is positive, the reaction is spontaneous. If Eº is negative, the reaction is non-spontaneous. ∆Gº is directly proportional to the negative value of Eº, therefore, if Eº is negative, ∆Gº will be positive and if Eº is positive, ∆Gº will be negative. In summary, Eº is positive, and ∆Gº is negative for a cell to be spontaneous. Eº is negative, and ∆Gº is positive for a cell to be non-spontaneous.

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The atom that is least likely to violate the octet rule in its compounds is helium.

The octet rule is a chemical principle that states that atoms tend to bond in such a way as to have eight electrons in their outermost energy level. In other words, atoms want to have a full valence shell, which is why they bond with other atoms. However, some atoms are more likely than others to violate the octet rule. In this case, helium is the atom that is least likely to violate the octet rule in its compounds.

This is because helium has only two electrons in its outermost energy level, so it only needs to gain or lose two electrons in order to have a full valence shell. Other atoms with more than two electrons in their outermost energy level are more likely to violate the octet rule because they need to gain or lose more electrons to have a full valence shell.

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The product so formed for the given chemical reaction is  C₆H₅CH₂COCl.

When phenylacetic acid (C₆H₅CH₂COOH) is treated with SOCl₂, it results into  phenylacetyl chloride.

The chemical reaction is depicted as follows-

C₆H₅CH₂COOH + SOCl₂ → C₆H₅CH₂COCl

An acyl chloride (or acid chloride) is an organic compound with the functional group −C(=O)Cl. Their formula is usually written R−COCl, where R is a side chain. They are reactive derivatives of carboxylic acids (R−C(=O)OH). A specific example of an acyl chloride is acetyl chloride, CH₃COCl. Acyl chlorides are the most important subset of acyl halides.

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Answer:

A.

Explanation:

In the balanced reaction, the coefficients in front of Fe and H are as follows: H: 2 on the left side (in the form of H+ ions), and 2 on the right side (in the form of H₂ gas) Fe: 1 on each side.

The atoms of each element in the equation are first balanced. We only have Fe, H, and O in this situation.

One Fe is present on each side, however the reactant side has two Hs, while the product side contains 2H+. Two H+ ions are added to the reactant side to balance H. Additionally, this balances the charge, giving us 2H on both sides.

For the given equation in an acidic solution, the balanced redox reaction is: Fe₂+(aq) + H₂(g) = Fe(s) + 2H+(aq) + 2e-

So, the equation that is balanced and has coefficients is:

1Fe₂+(aq) + 1H₂(g) = 1Fe(s) + 2H+(aq) + 2e-

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Answer:

42 days

Explanation:

Half life = 8.4 days

Starting mass = 40.0 g

Time = ?

Final Mass = 1/16 * 40 = 2.5 g

First Half life;

Remaining mass = 40 / 2 = 20g

Second Half life;

Remaining mass = 20 / 2 = 10g

Third Half life;

Remaining mass = 10 / 2 = 5g

Fourth Half life;

Remaining mass = 5 / 2 = 2.5g

Time = Number of half lives * Duration of half life = 5 * 8.4 = 42 days

Under pressure, oxygen is contained in oxygen cylinders, and as the cylinder is used down, the pressure gauge steadily decreases.

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Answer: I learned about this in school

Explanation:

Its very easy

Answer:

The nucleus contains genetic material

Protons are a type of subatomic particle with a positive charge

Neutrons bind with protons

Explanation:

To be honest i dont really know much

Answer: Well, 365 days is about how long it takes for Earth to orbit all the way around the Sun one time. It's not exactly this simple though. An Earth year is actually about 365 days, plus approximately 6 hours.

Answer:

CO2 I believe

Explanation:

It doesn't have any hydrogen