continental mountain ranges are formed when two tectonic plates —

The answer is not one of the choices provided. The correct value of δh° for the reaction 2 S (s) + 3 O2 (g) → 2 SO3 (g) is -692.5 kJ/mol.

To find the value of δh° for the reaction 2 S (s) + 3 O2 (g) → 2 SO3 (g), we can use Hess's law. This law states that the enthalpy change of a reaction is independent of the pathway taken to reach the products and depends only on the initial and final states of the reaction.
We can use the given values of δh° for the reactions involving S, O2, SO2, and SO3 to calculate the δh° for the desired reaction.
First, we need to reverse the reaction 2 SO3 (g) → 2 SO2 (g) + O2 (g) and change the sign of its δh° value to obtain the correct stoichiometry.
2 SO3 (g) → 2 SO2 (g) + O2 (g)    δh° = -198.2 kJ/mol (reversed and sign changed)
Next, we need to multiply the reaction by 2 to obtain the desired stoichiometry.
2 (2 SO3 (g) → 2 SO2 (g) + O2 (g))    δh° = -396.4 kJ/mol
Finally, we need to add the δh° values for the reactions involving S and O2 to obtain the δh° for the desired reaction.
2 S (s) + 3 O2 (g) → 2 SO3 (g)   δh° = (-296.1 kJ/mol) + (-396.4 kJ/mol) = -692.5 kJ/mol.

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Answer:

In this earthquake-resistant building, two steel supports in the shape of an X (A) help to reinforce walls. Concrete walls with steel bars in them (B) lessen any rocking movements. Shock absorbers (C) take up some of the building’s kinetic energy during a quake. I could use the toothpicks as the two steel in the shape of an X. The concrete walls and the shock absorbers would be the marshmallows.

Features shown by points A, B & C are reinforce walls, concrete walls and shock absorbers respectively.

Earthquake is a kind of natural disaster in which an intense shaing of the earth's outermost layer takes place.

According to the image following points we will consider as:

We can use the toothpicks in the shape of X as the two steel and concrete walls & the shock absorbers as the marshmallows.

Hence, marshmallows are used as the concrete walls and toothpicks are used as two steel rods.

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Answer:

in contact

Explanation:

Fields allow some objects to exert force on each other even when they are not contact with one another.

The region of space where the effect of a force is felt is know as a field.

Fields allow some objects to exert forces on each other even when they are not in contact .

The solution to the equation and value of variable 21(3d - 4) + 100 = 58 is d = 2/3.

Solve the equation 21(3d - 4) + 100 = 58, we can begin by simplifying and isolating the variable:

21(3d - 4) + 100 = 58

Distribute 21 to the terms inside the parentheses:

63d - 84 + 100 = 58

Combine like terms:

63d + 16 = 58

Subtract 16 from both sides:

63d = 42

Divide both sides by 63:

d = 42/63

Simplifying the fraction gives:

d = 2/3

The solution to the equation is d = 2/3.

The solution to the equation 21(3d - 4) + 100 = 58 is d = 2/3. By simplifying the equation, we find that dividing both sides by 63 results in the solution of d = 2/3, which satisfies the original equation.

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At rest, K+ concentrations are higher inside neurons. K+ has the propensity to migrate out of the neuron down the concentration gradient because it can freely pass the neuronal membrane.

The inside of the cell contains more potassium ions than the outside does. The system as a whole is electrically neutral because an anion balances out each potassium ion (on either side of the membrane). As a result, there is a high concentration of sodium ions outside the cell and a high concentration of potassium ions inside. Additionally, the neuronal membrane contains specialized proteins known as channels that create gaps in the membrane that are only permeable to certain ions.

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If you wanted to test either pressure or number of moles in a future gas law experiment, you would need to keep all other variables constant and manipulate only the variable you are testing.

For example, to test the effect of pressure, you could vary the pressure of the gas while keeping the number of moles and volume constant. Then, you could measure the resulting changes in temperature or volume. To test the effect of number of moles, you could vary the amount of gas while keeping the pressure and volume constant and measure the resulting changes in temperature or pressure. To set up an investigation to test one of these variables, you can use the Ideal Gas Law: PV=nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is temperature. If you want to test the effect of pressure, you can keep the number of moles, volume, and temperature constant, and change the pressure. Observe the changes in volume or temperature as pressure is altered.
On the other hand, if you want to test the effect of the number of moles, you can keep the pressure, volume, and temperature constant, and change the number of moles. Observe the changes in volume or temperature as the number of moles is varied. This will help you understand the relationship between the variables and their impact on gas behavior, guided by the gas laws.

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Answer:

(i) In a bond amortization schedule, the book value represents the remaining amount of the bond principal that hasn't been paid off at a given point in time. When a bond is first issued, its book value equals its face value. As payments are made over the life of the bond, a portion of these payments reduces the book value. By the end of the bond's life, its book value will be zero, as the entire principal will have been paid off.

(ii) The formula for the book value B at time k, where k is the number of periods elapsed, is B = C + Cg - jan-kj.

Here:

- C is the redemption amount,

- g is the modified coupon rate per period,

- j is the yield rate per period, and

- a_n-kj is the present value of an annuity immediate with n - k periods at the yield rate j.

This formula states that the book value at any time k is the redemption amount plus the present value of the future coupon payments (Cg), minus the present value of the annuity that represents the repayments of the bond (jan-kj).

The amortized amount at time k is the change in the book value from time k-1 to time k, plus the coupon payment at time k. It represents the portion of the bond's principal (and interest) that has been repaid up to time k.

(iii) If K is defined as the present value of the redemption value C, according to the Makeham formula, (C-K) would represent the difference between the redemption value of the bond and its present value. This difference is the amount of interest that will accumulate over the life of the bond. In other words, (C-K) can be interpreted as the total interest that the bondholder will earn from holding the bond until redemption, assuming that all coupon payments are reinvested at the yield rate j.

Explanation:

Carbocyclic compounds are compounds that have form a carbon atom rings.

Carbocyclic compounds e.g. aromatic or non-aromatic cyclic carbon compounds are those compound that have a carbon ring attached or enclosed to them. A good example of organic compound freely occurring in nature are of this form. The main parent of these compounds are either benzene of cyclohexane or cyclohexene.

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The correct answer is Gasoline [Homogeneous], soil[Heterogeneous], cranberry juice [Homogeneous], salt water [Homogeneous].

A mixture is a substance made up of two or more dissimilar chemical compounds that are not chemically linked in chemistry. When two or more substances are physically combined, their identities are maintained, and the mixture takes the shape of solutions, suspensions, or colloids. One or more pure components of differing compositions make up a combination. Heterogeneous and homogeneous mixtures are the two types of mixtures. While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

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The answer is- Gasoline - homogeneous, Soil- heterogeneous, Cranberry juice - homogeneous and Salt water-homogeneous.

Mixture: The substance that has two or more elements or compounds mixed together without binding them chemically is known as mixture.

The constituents of mixture can be separated by various methods.

What are homogeneous and heterogeneous mixture?

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Answer:

2H₂O → 2H₂ + O₂

         2NaCl → 2Na + Cl₂

Explanation:

         2H₂O → 2H₂ + O₂

         2NaCl → 2Na + Cl₂

The reactions shown above is a decomposition.

In a decomposition reaction or cracking, two or more products are formed from a single product.

The breakdown of a compound into its components as individual elements or other compounds falls into this category of reactions.

Cracking is a sort of decomposition reactions that is used in petroleum industries to sort the fractions of a compound.

220 grams are there in 5 moles of CO₂.

Mole is defined as the mass of a system whose elementary constituents total the number of atoms in 0.012 kilograms of carbon 12. Any material has a molecular weight of 6.023 x 10²³. It can be used to quantify the results of a chemical reaction. The term "Molarity" is derived from the unit of measurement called a mole, which is used to describe chemical substances.

To get an object's mass, divide its weight by the acceleration of gravity.

As we know that mass of CO₂ is 44 gram.

The mass in grams of one mole of any chemical is known as its molar mass.

Number of moles = Mass of substance / Mass of one mole.

1  mole = 44 gram of CO₂

So 5 mole = 44 gram x 5

                 = 220 gram of CO₂

Thus, 220 grams are there in 5 moles of CO₂.

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Answer:

Electrons

Explanation:

I just know the answer

7. the pH of 0.81 M Mg(OH)₂ solution is 9.19.

8. the pH of 0.27 M pyridine solution is 9.11.

Mg(OH)₂ is a base which dissociates to produce two OH⁻ ions.

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of Mg²⁺ is 0.81-x

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Initial concentration (M)    0         0

Change (M)                 -x         +2x

Equilibrium Concentration  0.81-x      x     x

Using Kb for Mg(OH)₂,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For Mg(OH)₂,Kb = [Mg²⁺][OH⁻]²/Kw= (x)²/0.81 - x

Kb = 4.5 × 10⁻¹² = x²/0.81 - x

On solving the equation,x = 7.7 × 10⁻⁶M

Therefore, the concentration of OH⁻ ions = 2 × 7.7 × 10⁻⁶ = 1.54 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.54 × 10⁻⁵pOH = 4.81pH = 14 - 4.81 = 9.19

Thus, the pH of 0.81 M Mg(OH)₂ solution is 9.19.

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of C₅H₅NH⁺ is 0.27 - x.

C₅H₅N + H₂O ⇌ C₅H₅NH⁺ + OH⁻

Initial concentration (M)   0.27      0

Change (M)                -x       +x

Equilibrium Concentration  0.27-x     x

Using Kb for C₅H₅N,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For C₅H₅N,

Kb = [C₅H₅NH⁺][OH⁻]/[C₅H₅N]= (x) (x)/(0.27-x)Kb = 1.7 × 10⁻⁹

= x²/(0.27-x)

On solving the equation,

x = 1.3 × 10⁻⁵ M

Therefore, the concentration of OH⁻ ions = 1.3 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.3 × 10⁻⁵pOH

= 4.89pH = 14 - 4.89 = 9.11

Thus, the pH of 0.27 M pyridine solution is 9.11.

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Answer:

4.. increases

5..lowers

6.. increases

7.. increases

8.. speed

Answer:

When a substance is heated, its temperature rises because its molecules move faster and gain thermal energy. Temperature measures the "hotness" or "coldness" of an object. The term heat refers to thermal energy being transferred from a hotter system to a cooler one.

Answer:

51.75 moles

Explanation:

2NH3   ⇒   N2   +   3H2

2           :      1      :      3        

34.50                                  (moles)

⇒ \(n_{H2\) = 34.50 × 3 ÷ 2 = 51.75 (moles)

A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

The pair of substances that are most likely to form a homogeneous solution is B. H2O and CH3OH. A homogeneous mixture is one in which the components are evenly distributed throughout the mixture. These types of solutions have uniform properties and the same composition throughout.A heterogeneous mixture is one in which the components are not evenly distributed. This means that the mixture has distinct regions or phases that are visibly different from one another. The following are the most likely pairs of substances to form a homogeneous solution:A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

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Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

The gas exchange refers to the process by which oxygen is absorbed by red blood cells and carbon dioxide is removed through the respiratory system.

The process of gas exchange is carried out due to the differential diffusion rates of gases in the bloodstream (O2 and CO2), which facilitates the transference of these gases.

In conclusion, each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

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The substances would take up more space as gas than as a solid.

We know that a solid has a definite shape and a definite volume. We know what the space that a solid is going to occupy is because the space that it can occupy is fixed. This is quite important to be at the back of our minds as we discuss.

A gas does not take up a definite space. We know that a gas does take up the volume of the object thus we can be bold to say that the gas is going to take up more space than the solid in all the cases.

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The factor that will affect the rate of reaction is temperature. Factors that affect the rate of reaction are called kinetic factors. Ea, ΔH, ΔS, and temperature are all kinetic factors that influence the rate of a reaction.

The rate of reaction is the change in concentration of a reactant or product per unit time. It's usually given in moles per second or liters per second.

It's important to keep in mind that reaction rate isn't always constant.

During the reaction, it might increase, decrease, or remain steady.

The rate of a reaction is determined by a variety of factors, including: Ea (activation energy): This is the energy required to initiate a reaction. Higher activation energy implies a slower reaction, whereas lower activation energy means a quicker reaction.

Temperature: This is the most important factor influencing reaction rate. The rate of reaction doubles for every 10°C increase in temperature.

A higher temperature means more kinetic energy, resulting in more effective collisions between particles. A lower temperature has the opposite effect, slowing down the reaction.

ΔH (enthalpy): The heat absorbed or released by a reaction is referred to as enthalpy. A reaction with a positive enthalpy is endothermic, whereas a reaction with a negative enthalpy is exothermic.

An endothermic reaction absorbs heat, causing the reaction rate to slow down. An exothermic reaction, on the other hand, generates heat and speeds up the reaction.

ΔS (entropy): This is a measure of the amount of disorder or randomness in a system. Increasing the disorder in the system can aid in the dissolution of solids, resulting in a faster reaction.

ΔG (free energy): This is the energy that is available to do work. When ΔG is negative, the reaction is spontaneous and exothermic, and the reaction rate is increased.

When ΔG is positive, the reaction is non-spontaneous and endothermic, and the reaction rate is decreased. When ΔG is zero, the reaction is at equilibrium, and the rate of the forward reaction is equal to the rate of the reverse reaction.

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Among the given options, Sodium nitrate (NaNO3) is a compound that is neither an acid nor a base. Thus, the correct option for this question is A.

The properties of acids are as follows:

Sodium nitrate (NaNO3) is classified in the category of salt that can be significantly developed in the reaction of sodium hydroxide (NaOH) which belongs to a base, and nitric acid (HNO3) which belongs to an acid.

Therefore, sodium nitrate (NaNO3) is one of the compounds that is neither an acid nor a base. Thus, the correct option for this question is A.

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Acetic acid is the by product of production of aspirin. Aspirin crystals are formed after the acetic acid is removed through filtration of the acetic acid-water solution. Recrystallization from an ethanol/water solvent pair removes any trace levels of salicylic that are still present.

Acetylsalicylic acid (ASA), generally known as aspirin, is a nonsteroidal anti-inflammatory medication (NSAID) used to treat inflammation, fever, and/or pain as well as a blood thinner. Aspirin is used to treat a variety of inflammatory disorders, including Kawasaki disease, pericarditis, and rheumatic fever. 

Long-term usage of aspirin is also used to help those at high risk avoid further heart attacks, ischemic strokes, and blood clots.

The effects of pain or fever usually start to take effect after 30 minutes. While aspirin functions similarly to other NSAIDs, it also inhibits platelets' natural function.

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A mutagen is a chemical or physical agent capable of inducing changes in DNA, leading to mutations.

Mutagens can alter the genetic material by causing changes in the DNA sequence, such as substitutions, deletions, insertions, or rearrangements. These changes can result in the formation of new alleles or the disruption of normal gene function.

Examples of mutagens include certain chemicals, such as certain pesticides, tobacco smoke, and certain chemotherapy drugs. Physical agents like ionizing radiation (e.g., X-rays, gamma rays) and ultraviolet (UV) radiation from the sun or tanning beds can also induce DNA mutations.

It is important to note that not all mutagens are harmful. Some mutations can be beneficial, leading to genetic variation and adaptation in populations, while others may have detrimental effects, such as contributing to the development of diseases like cancer.

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Answer:

45 mL

Explanation:

Tenemos los siguientes datos:

V = 1 L

C = 4,5% v/v

El porcentaje en volumen (%v/v) expresa el volumen de soluto (alcohol en este caso) que hay cada 100 mL de solución. Si la solución tiene una concentración del 4,5% v/v eso quiere decir que hay 4,5 ml de alcohol cada 100 ml de solución, de acuerdo a lo siguiente:

4,5% v/v alcohol = volumen alcohol/ volumen solución x 100 = 4,5 mL alcohol/100 mL solución= 4,5 mL alcohol/0,1 L alcohol

Por lo tanto, al multiplicar por el volumen total de la solución (1 L), obtenemos la cantidad total de alcohol:

4,5 mL alcohol/0,1 L alcohol x 1 L = 45 mL

Answer:

c. nilai pH kurang dari 7

Explanation:

cuka adalah acid

nilai pH bagi acid adalah

antara 1 hingga 6

The step in a chemical reaction that defines the pace (or rate) at which the entire reaction occurs is known as the rate-determining step.

Thus, The rate-determining step is comparable to the funnel's neck. The breadth of the funnel's neck, not the pace at which water is poured into it, limits or determines how quickly water flows down a funnel.

The sluggish step of a reaction controls the rate of a reaction, much like the funnel's neck.

Not all reactions have rate-determining stages, and those that do only have them if one of their steps is noticeably slower than the others.

Thus, The step in a chemical reaction that defines the pace (or rate) at which the entire reaction occurs is known as the rate-determining step.

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A single substitution reaction a strip or zinc metal is added to a copper(II) nitrate solution. Copper will be pushed out of the solution by zinc. As a result, zinc nitrate, Zn(NO3)2, and copper metal, Cu, produced.

An illustration of a single substitution reaction is the reaction of potassium (K) and water (H2O). In the process, hydrogen gas (H2) is released and potassium hydroxide (KOH), a colourless solid chemical, formed. 2K + 2H2O 2KOH + H is the reaction's equation.

This page explains the Copper II Nitrate formula, sometimes referred to as Cupric nitrate or Copper Dinitrate formula. This inorganic substance exists as a solid with blue crystals. Cu(NO3)2 is the chemical formula for Copper II Nitrate.

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This problem is asking for an explanation of what we need to know about double and triple bonds to successfully predict molecular geometries in molecules. At the end, one comes to the conclusion that double and triple bonds contribute to the degree in which an atom is bonded and they also determine the lone pairs, which, at the same time,  define the molecular geometry.

In chemistry, molecules are not necessarily flat arrangements of atoms, yet they have specific bond angles, orientations and shapes, which define the molecular geometry. In such a way, we can use the VSEPR theory in order to know the molecular geometry of a molecule; however, we first need its Lewis structure or at least the number and type of bonds to do so.

Consider water and carbon dioxide; the former has two hydrogen to oxygen bonds (O-H) and 2 lone pairs because O has six valence electrons but just 2 are bonded to complete the octet, so 4 unpaired electrons lead to two lone pairs. On the other hand, the latter has two double bonds (C=O) and 0 lone pairs because carbon has four valence electrons and they are all bonded to complete the octet.

In such a way, one can see how the double bond affected the bonding in CO2 in contrast to the H2O; situation that also applies to triple bonds, because CO2 has a linear molecular geometry whereas water has a bent one (see attached picture)

Hence, one comes to the conclusion that double and triple bonds contribute to the degree in which an atom is bonded and they also determine the lone pairs, which, at the same time, define the molecular geometry.

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Answer:

co2 oxide,nacl salt ,hcl acid