What is the main purpose of using NaOH in the saponification reaction . NaOH works as the catalyst b. NaOH solution is the solvent for the reaction c. NaOH acts as a reactant in the reaction d. NaOH facilitates the soap to salt out from the solution

Answer: The work done by the system is -506.5 Joules and change in the system's internal energy is -206.5 Joules

Explanation:

According to first law of thermodynamics:

[tex]\Delta E=q+w[/tex]

[tex]\Delta E[/tex]=Change in internal energy

q = heat absorbed or released

w = work done or by the system

w = work done by the system= [tex]-P\Delta V[/tex]  {Work is done by the system as the final volume is greater than initial volume and is negative}

w =[tex]-1atm\times (15.0-10.0)L=-5.00Latm=-506.5Joules[/tex]  {1Latm=101.3J}

q = +300J   {Heat absorbed by the system is positive}

[tex]\Delta E=+300+(-506.5)=-206.5J[/tex]

Thus the work done by the system is -506.5 Joules and change in the system's internal energy is -206.5 Joules

The work done by the system during expansion is -506.625 joules, and the change in internal energy is 806.625 joules.

The work done by the system when a gas expands from a volume of 10.0 L to 15.0 L against an external pressure of 1 atm can be found using the formula work (W) = -pressure (P) × change in volume (ΔV). First, we need to convert the pressure to joules by using the conversion 1 L·atm = 101.325 J. The change in volume (ΔV) is 15.0 L - 10.0 L = 5.0 L. Thus, the work done by the system can be calculated as W = -(1 atm) × (5.0 L) × (101.325 J/L·atm) = -506.625 J.

The change in the internal energy (ΔU) of the system can be found using the first law of thermodynamics, which is ΔU = Q - W, where Q is the heat absorbed by the system. In this case, Q = +300 J and the work done by the system, W, is -506.625 J. Therefore, the change in internal energy is ΔU = 300 J - (-506.625 J) = 806.625 J.

Answer:

40,000g/L

Explanation:

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By definition, the concentration that describes the solution is 400 [tex]\frac{grams}{L}[/tex].

Solute and solvent are two components of a solution. The solute is the substance (solid, liquid, or gas) that dissolves in the solvent to produce a homogeneous mixture known as a solution.

In the solution, the solute is usually found in a lower proportion than the solvent, while generally, the solvent is the component that is found in the greater proportion in the solution.

The concentration of a solution is the amount of solute (dissolved substance) in an amount of solvent or solution.

There are different ways to express the concentration of a solution.

In this case, the mass of solute per volume of solution is a measure of concentration that is determined by dividing the mass in grams of the solute present in the solution sample by the volume of the sample.

In this case, the solution contains 80 g of sugar per 200 ml (0.2 L, being 1000 mL= 1 L) of solution. Then, the mass of solute per volume of solution can be calculated as:

[tex]mass of solute per volume=\frac{80 grams}{0.2 L}[/tex]

Solving:

[tex]mass of solute per volume=400\frac{ grams}{ L}[/tex]

Finally, the concentration that describes the solution is 400 [tex]\frac{grams}{L}[/tex].

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Answer:

The answer to your question is 1) 0.037 M  2) 0.32 M  3)  0.096 M

Explanation:

a) 125 ml of 0.251 M HCl

-Calculate the moles of HCl

Molarity = moles/volume

-Solve for moles

moles = Molarity x volume

-Substitution

moles = 0.251 x 0.125

           = 0.0314

-Calculate the new molarity

Molarity = 0.0314/ (0.125 + 0.250)

-Simplification

Molarity = 0.014/0.375

-Result

Molarity = 0.037 M

2.-

445 ml of 0.499 M of H₂SO₄

-Calculate the number of moles

moles = 0.499 x 0.445

moles = 0.222

-Calculate the new molarity

Molarity = 0.222/(0.445 + 0.25)

Molarity = 0.222/0.695

Molarity = 0.32

3)

5.25 l of HCO₃ 0.101 M

Calculate the number of moles

moles = 0.101 x 5.25

moles = 0.53

-Calculate the Molarity

Molarity = 0.53 / (0.25 + 5.25)

Molarity = 0.53 / 5.5

Molarity = 0.096

The new molarity of each question is: (a): 0.0835 M, (b): 0.3194 M, and (c) 0.0964 M.

The new molarities after adding 250 mL of water to each solution are: a) 0.0835 M for the first solution (HCI) b) 0.3194 M for the second solution (H2SO4) c) 0.0964 M for the third solution (HCO3).

To calculate the new molarity after dilution, we can use the dilution equation:

[tex]\[ C_1V_1 = C_2V_2 \][/tex]

where [tex]\( C_1 \)[/tex] is the initial concentration, [tex]\( V_1 \)[/tex] is the initial volume, [tex]\( C_2 \)[/tex] is the final concentration, and [tex]\( V_2 \)[/tex] is the final volume.

Let's solve for each case:

a) For the first solution:

- Initial concentration [tex](\( C_1 \))[/tex] = 0.251 M

- Initial volume [tex](\( V_1 \))[/tex] = 125 mL

- Final volume [tex](\( V_2 \))[/tex] = 125 mL + 250 mL = 375 mL

We need to find the final concentration [tex](\( C_2 \))[/tex]. Using the dilution equation:

[tex]\[ C_1V_1 = C_2V_2 \][/tex]

[tex]\[ 0.251 \text{ M} \times 125 \text{ mL} = C_2 \times 375 \text{ mL} \][/tex]

[tex]\[ C_2 = \frac{0.251 \text{ M} \times 125 \text{ mL}}{375 \text{ mL}} \][/tex]

[tex]\[ C_2 = \frac{31.375 \text{ mL} \cdot \text{M}}{375 \text{ mL}} \][/tex]

[tex]\[ C_2 = 0.0835 \text{ M} \][/tex]

So, the new molarity for solution A is 0.0835 M.

b) For the second solution:

- Initial concentration [tex](\( C_1 \))[/tex] = 0.499 M

- Initial volume [tex](\( V_1 \))[/tex] = 445 mL

- Final volume [tex](\( V_2 \))[/tex] = 445 mL + 250 mL = 695 mL

Using the dilution equation:

[tex]\[ C_1V_1 = C_2V_2 \][/tex]

[tex]\[ 0.499 \text{ M} \times 445 \text{ mL} = C_2 \times 695 \text{ mL} \][/tex]

[tex]\[ C_2 = \frac{0.499 \text{ M} \times 445 \text{ mL}}{695 \text{ mL}} \][/tex]

[tex]\[ C_2 = \frac{222.005 \text{ mL} \cdot \text{M}}{695 \text{ mL}} \][/tex]

[tex]\[ C_2 = 0.3194 \text{ M} \][/tex]

So, the new molarity for solution B is approximately 0.3194 M.

c) For the third solution:

- Initial concentration [tex](\( C_1 \))[/tex] = 0.101 M

- Initial volume [tex](\( V_1 \))[/tex] = 5.25 L = 5250 mL

- Final volume [tex](\( V_2 \))[/tex] = 5250 mL + 250 mL = 5500 mL

Using the dilution equation:

[tex]\[ C_1V_1 = C_2V_2 \][/tex]

[tex]\[ 0.101 \text{ M} \times 5250 \text{ mL} = C_2 \times 5500 \text{ mL} \][/tex]

[tex]\[ C_2 = \frac{0.101 \text{ M} \times 5250 \text{ mL}}{5500 \text{ mL}} \][/tex]

[tex]\[ C_2 = \frac{530.25 \text{ mL} \cdot \text{M}}{5500 \text{ mL}} \][/tex]

[tex]\[ C_2 = 0.0964 \text{ M} \][/tex]

So, the new molarity for solution C is approximately 0.0964 M.

Answer:

Concentration of hydrogen ions in solution

Brainliest would be appreciated

Final answer:

pH measures the concentration of hydrogen ions in a solution and indicates its acidity or basicity. The pH scale ranges from 0 to 14, with lower values being acidic and higher values alkaline. The pH value represents the negative logarithm of the hydrogen ion concentration.

Explanation:

pH measures the concentration of hydrogen ions (H+) in a solution. In pure water, a small percentage of water molecules dissociate into equal numbers of hydrogen ions (H+) and hydroxide ions (OH−), which is a source of hydrogen ions in solutions. The pH scale, which ranges from 0 to 14, determines a solution's acidity or basicity; a pH less than 7 indicates acidity, greater than 7 indicates alkalinity, and a pH of 7 is neutral. The pH value is a negative logarithm of the hydrogen ion concentration, meaning that each whole number on the pH scale represents a tenfold increase or decrease in hydrogen ion concentration.

The pH of a solution provides a quick way to determine its acidity or basicity. High concentrations of hydrogen ions yield a low pH, whereas low concentrations result in a high pH. The relative acidity or alkalinity of a solution can significantly impact various chemical and biological processes, making pH an essential parameter in science and various industries.

During the electrolysis of an aqueous solution of KI, I₂ will be formed at the anode.

It is process by which electric current is passed through a substance to effect a chemical change.

The chemical change is one in which the substance loses or gains an electron (oxidation or reduction).

In order for KI to undergo electrolysis it has to be in its molten state or aqueous state because this will enhance the migration of ions.

The following reactions and observations occur during the electrolysis of aqueous solution of KI.

At the anode,

Two reactions are like to occur that the one in which the I⁻ is oxidized to give I₂ and the one in which oxygen is formed from water but in both above only the case in which I₂ is produced is the one that is been observed because of the presence of the violet colour.

The equation of Reaction is given below;

2 I⁻ (aq) -------> I₂ (g) + 2 e⁻

Note that the I₂ is in gaseous form.

Hence, During the electrolysis of an aqueous solution of KI, I₂ will be formed at the anode.

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During the electrolysis of an aqueous solution of KI, iodine (I₂) will be produced at the anode due to the oxidation of iodide ions. Option D is correct.

This process involves the oxidation of iodide ions (I−), which can be represented by the half-reaction: 2I⁻(aq) → I₂(s) + 2e⁻. This indicates that iodide ions are oxidized to iodine solid and electrons are released in the process.

It is important to note that while water can also undergo oxidation to produce oxygen gas, the formation of iodine at the anode takes precedence over oxygen evolution because iodide ions are more easily oxidized than water molecules in this scenario.

Hence, D. is the correct option.

The complete question is:

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Predict which of the following will be formed at the anode in the electrolysis of an aqueous solution of KI. Predict which of the following will be formed at the anode in the electrolysis of an aqueous solution of KI.

A) O₂

B) H₂

C) K

D) I₂

Answer:

[tex]T_2=571.9K[/tex]

Explanation:

Hello,

In this case, we consider the following formula defining the energy and the temperature change for the sample of iron:

[tex]Q=n_{Fe}Cp_{Fe}(T_2-T_1)[/tex]

Now, solving the final temperature, considering a positive inlet heat, we have:

[tex]T_2=T_1+\frac{Q}{n_{Fe}Cp{Fe}} =293K+\frac{3500J}{0.5mol*25.1J/(mol*K)} \\T_2=571.9K[/tex]

Best regards.

Answer:

Explanation:

Step 1: Data given

Number of heat transfer = 3500 J

Number of moles of iron = 0.5 moles

Initial temperature = 293 K

The molar heat of iron is 25.1 J/(mol*K)

Step 2: Calculate ΔT

Q = n* C * ΔT

⇒with Q = the heat transfer = 3500 J of energy

⇒with n = the number of moles iron  = 0.5 moles

⇒with C = the molar heat of iron = 25.1 J/mol*K

⇒ΔT = the change of temperature = T2 - T1 = T2 - 293 K

3500 J = 0.5 moles *25.1 J/mol * K * ΔT

ΔT = 278.9

Step 3: Calculate ΔT

ΔT = 278.9 = T2 - T1 = T2 - 293 K

T2 = 278.9 + 293 K

T2 = 551.9 K

Answer:

The ideal gas law ... A gas turbine, which uses continuous combustion, simply exhausts its ... This makes them ideal for use in vehicles, as they also start up more ... A four stroke engine delivers one power stroke for every two cycles of ... ignition, exhaust) however, these steps occur 3 times per one spin of. Internal combustion engine.

Explanation:

Ideal gas law is applicable  to each of the steps of the 4 stroke engine.

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

It was first stated by Benoît Paul Émile Clapeyron in 1834 as a combination of the empirical Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law. The ideal gas law is often written in an empirical form.

The state of an amount of gas is determined by its pressure, volume, and temperature. The modern form of the equation relates these simply in two main forms. The temperature used in the equation of state is an absolute temperature: the appropriate SI unit is the kelvin.

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Answer:

Reproduction in Gymnosperms: Gymnosperms are heterosporous and sexual reproduction is oogamous type. In living gymnosperms the reproductive structures are arranged in the form of strobili or cones (except the ovulate structures of Cycas).

Explanation:

Answer:

Cones are the reproductive structures of gymnosperms.

Explanation:

Answer:

the temperature of the non- catalyzed reaction is = 2793.75 K

Explanation:

The reaction of the spontaneous decomposition of hydrogen peroxide to give water and oxygen is given as:

[tex]2H_2O_{2(aq)} ----> 2H_{2(l)} + O_2_{(g)}[/tex]

The activation energy of non-catalyzed reaction [tex]E{a_1} = 75 kJ/mol[/tex]

The activation energy of metal catalyzed reaction [tex]E{a_2} = 8 kJ/mol[/tex]

The temperature of metal catalyzed reaction [tex]T_2 = 25^0C[/tex] = (25+273)K = 298 K

The rate constant of the non-catalyzed reaction can be expressed as:

[tex]k_1 = Ae^{{-Ea_1}/RT_1}[/tex] ----- equation (1)

The rate constant of the metal catalyzed reaction can be expressed as:

[tex]k_2 = Ae^{{-Ea_2}/RT_2}[/tex]

Then [tex]k_1 = k_2[/tex]

[tex]Ae^{{-Ea_1}/RT_1}=Ae^{{-Ea_2}/RT_2}[/tex]

[tex]e^{{-Ea_1}/RT_1}=e^{{-Ea_2}/RT_2}[/tex]

[tex]\frac{Ea_1}{RT_1}}=\frac{Ea_2}{RT_2}}[/tex]

[tex]T_1 = \frac{Ea_1*T_2}{Ea_2}[/tex]

[tex]T_1 = \frac{75*298}{8}[/tex]

[tex]\\T_1 = 2793.75 \ K\\[/tex]

Thus; the temperature of the non- catalyzed reaction is = 2793.75 K

Answer:

Approx. 8 grams of KNO3 will not dissolve

Explanation:

According to the curve at 20 degrees C only 32 grams of KNO3 can dissolve in 100 grams of water meaning if you hvae 40 grams of KNO3 in water at 20 degrees C ; 40-32= 8

Given question is incomplete. The complete question is as follows.

The successive ionization energies of a certain third-period element are I1 = 577.9KJ/mol, I2 + 1820 KJ/mol, I3 = 2750 KJ/mol, I4 = 11600 KJ/mol, I5 = 14800 KJ/mol. what element do these ionization energies suggest? Explain your reasoning.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

Here, given ionization energies belong to an element present in third period.

We know that second ionization energy will always be greater than third ionization energy.

For the given ionization energies, there is a huge  difference between third and fourth ionization energy. This means that there are three valence electrons present in the element.

This is because after losing three electrons it is difficult for the given element to lose fourth electron. Hence, [tex]IE_{4}[/tex] is high as compared to [tex]IE_{3}[/tex].

Hence, this element has 3 valence electrons and it belongs to 3A group of the periodic table.

Thus, we can conclude that the given unknown element is aluminium (Al).

The unknown element, suggested by the provided pattern of ionization energies, most likely has 3 valence electrons, which fits the characteristics of aluminum (Al). The significant increase in the fourth ionization energy suggests the removal of an electron from a stable noble gas core.

The pattern in ionization energies indicates that the unknown element contains 3 valence electrons. The ionization energy increases with each successive removal of an electron, however, the energy required for the fourth ionization is significantly larger than the previous one. This dramatic increase indicates that electrons are being removed from a stable noble gas configuration. Therefore, the element must have 3 valence electrons in its outermost shell and the nearest noble gas core underneath. This property is characteristic of elements in group 13 of the periodic table, and considering the given ionization values, the unknown element is most likely aluminum (Al).

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Answer:

Ninguno estará en el agua después de 15 minutos.

Explanation:

Tomar 25 + 30 = 55 por minuto de agua que sale. Como ahora sabemos eso, tómese 55 minutos por 15 minutos. Debe obtener 825, por lo tanto, no quedará agua.

- Avíseme si esto es incorrecto o si desea una explicación más detallada. Espero que esto haya ayudado!

According to unitary method, there will be 825 liters of water and hence there will be no water left .

Unitary method is a process by which we find the value of a single unit from the value of multiple units and the value of multiple units from the value of a single unit. It is a method that we use for most of the calculations in math.

Water coming out= 25+30=55 liters of water comes out in 1 minute, thus in 15 minutes 15×55=825 liters will come out and hence there will be no water left.

Thus, according to unitary method, there will be 825 liters of water and hence there will be no water left .

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There are 800 liters of water in a tank. A tube pours 25 liters per minute into the tank at the top, and 30 liters per minute comes out at the bottom through another tube. How many liters of water will be in the tank after 15 minutes of operation?

Answer:

see explanation

Explanation:

Using the periodic table, look at the top of each column => These are group numbers ... Typically (for american tables) the numbers are divided into A-Groups and B-Groups... For this post, you need to focus on the A-Groups, or 'Main Group Elements'... Now, the numbers also represent the number of valence (outer shell) electrons in the elements listed below that number. For example, under Group IA, all elements ( H, Li, Na, K, Rb, Cs & F) all have one (1) outer shell electron. All elements under IIA have two outer shell electrons, IIIA, 3 outer shell electrons and so on. The exception is Helium (He) which has only 2 outer shell electrons and is typically listed under Group VIIIA.

So ...

X· => H, Li & Na

X: => He(noble gas exception), Be & Mg

·X: => B & Al

:X: => C & Si

X(5 dots) => N  

X(6 dots) => O

X(7 dots) => F & I

X(8 dots) => Ne

Answer:

Although it is possible to have more than one state, it is also possible to have only one state.

Explanation:

At the end the energy of the system is the same as 200 J.

Explanation:

It is a closed complex system and it has 200 J of energy.

Here the system is converting from one form to another form and then to another form.

As we know that there is a conservation of energy when one form is converted to another form without losing or gaining energy, whereas it may convert from one form to another form with the energy being conserved.

So after there is a conversion of one form to another form but there is no loss or gain of energy and same energy must be retained.

Answer:

40g of CO2 at 10C

Explanation:

Since average kinetic energy depends on absolute temperature (directly proportional to absolute temperature) and independent of amount and nature of gas. given that is have same temperature.

40g of CO2 at 10C

Any gas at 10 ℃ would have the same average kinetic energy as 10.0 grams of CO2 at the same temperature due to the principles of the kinetic molecular theory.

The conditions that contain molecules with the same average kinetic energy as the molecules in 10.0 grams of CO2 at 10 ℃ would be any other mass of gas at the same temperature, since the average kinetic energy of the molecules of a gas depends only on temperature according to the kinetic molecular theory. This is true regardless of the type of gas or its mass, as long as the gases are at the same temperature.

For example, if you have helium gas at 10 ℃, the average kinetic energy of its molecules would be the same as that of the CO2 molecules at 10 ℃. This is because the kinetic molecular theory posits that all gases at the same temperature have the same average kinetic energy.

Answer:

Because you can freeze the water you melted back into a ice cube.

Explanation:

Melting an ice cube is a reversible physical change because it involves a change in state (from solid to liquid) that can be reversed (from liquid back to solid). No new substances are formed in this process, hence, it's a physical change, not a chemical one. The substance, water, maintains its identity throughout the process.

Melting an ice cube is a reversible physical change because the process can be reversed by freezing. When an ice cube melts, it changes its state from solid (ice) to liquid (water) due to an increase in temperature. This is a physical change, not a chemical change because no new substances are formed - water (H2O) remains water in both solid and liquid states.

When the temperature drops, the liquid water can freeze back to become ice - this is the reverse of the melting process. Hence, it's considered a reversible physical change since we can revert the material (water) back to its original state (ice) under standard conditions. The key here is that the basic identity of the substance (water, in this case) does not change throughout this process.

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Answer:

la neta no se me llevo los puntos

Explanation:

no se ingles

The temperature at which the volume of the gas increases from 49 mL to 74 mL, keeping the pressure constant, is approximately 149.43 0C, calculated using Charles's Law.

The question involves the application of Charles's Law, which relates the volume of a gas to its temperature when the pressure and the amount of gas are held constant. To find the temperature at which the volume of gas increases from 49 mL to 74 mL, you need to set up a ratio using Charles's Law, which is V1/T1 = V2/T2, where T is in Kelvin. Make sure to convert Celsius to Kelvin by adding 273.15.

First, we'll convert the initial temperature from Celsius to Kelvin: T1 = 7.0 + 273.15 = 280.15 K. Next, we'll use the volumes provided (V1 = 49 mL and V2 = 74 mL) to find the final temperature, T2.

By re-arranging Charles's Law, we get T2 = (V2 × T1) / V1. Plugging the values in, T2 = (74 mL × 280.15 K) / 49 mL = 422.58 K. To present this temperature in Celsius, subtract 273.15 from it: T2 = 422.58 K - 273.15 = 149.43 °C.

Therefore, the temperature at which the volume of gas is 74 mL is approximately 149.43 °C.

Answer:

Radioactive decay is defined as the disintegration of an unstable nucleus accompanied by the release of energy.

The different types of radioactive decay are: alpha decay, beta decay, gamma decay; which are accompanied by the release of photons or other subatomic particles.

The mass number (A) and charge number (Z) of the following products of radioactive decay are:

(a) a neutron : [tex]_{0}^{1}\textrm{n}[/tex]

A - 1

Z - 0

(b) an α- particle: [tex]_{2}^{4}\textrm{He}[/tex]

A - 4

Z - (+2)

(c) a positron : [tex]_{+1}^{0}\textrm{\beta }[/tex][tex]\beta[/tex]

A - 0

Z - (+1)

(d) a photon

A - 0

Z - 0

(e) a β- ray: [tex]_{-1}^{0}\textrm{\beta }[/tex][tex]\beta[/tex]

A - 0

Z - (-1)

Answer: -2044.0 kJ/mol

Explanation:

Answer on Edg 2020

Answer:

Explanation:

Answer:

The answer to your question is below

Explanation:

Ionic bond is a kind of bond in which a metal attaches to a nonmetal. Also we know that a molecule has ionic bonding if the electronegativity is higher than 1.7.

                    Kind of elements         Difference of electronegativity     Bond

a) MgO         Metal - Nonmetal                3.44 -  1.31 = 2.13                     Ionic

b) SrCl₂        Metal -Nonmetal                  3.16 - 0.95 = 2.21                    Ionic

c) O₃             Nonmetal- Nonmetal          3.44 - 3.44 = 0                      Covalent

d) CH₄O       Nonmetal-Nonmetal           3.44 - 2.55 = 0.89                Covalent

   Carbon, Hydrogen and oxygen are nonmetals

2) Silver coins can conduct electricity.

Taking into account the definition of ionic and covalent bond and conductive materials :

An ionic bond is a type of chemical bond that occurs when one atom gives up an electron to the other, in order for both to achieve electronic stability.

This union normally occurs between metal and nonmetal elements with different electronegativity, which means that the elements have different capacity to attract electrons.

In other words, an ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.

The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule.

Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.

In this case, you know that:

Then, the compound:

a. Magnesium oxide (MgO) Ionic

b. Strontium chloride (SrCl₂) Ionic

c. Ozone (O₃) Covalent

d. Methanol (CH₄O) Covalent

Electrical conductivity is the property of a material that allows an electrical current to travel through its atomic structure, with low resistance from this material.

Conductive materials are those that offer little resistance to the passage of electricity. Electrons can circulate freely through material because they are loosely bound to atoms and can therefore conduct electricity.

In other words, conductive materials allow the free flow of electrons between particles, facilitating the conduction of electricity across the entire surface.

Conductors, then, are those that have a large number of free electrons that move through the material, transmitting charge more easily from one object to another.

Metals have several million atoms, each with two or three electrons in its outer orbit (valence electrons). These valence electrons, in metals, are characterized by a tendency to release electrons to achieve a certain stability in terms of their configuration. In this way they conduct electricity.

Silver Ag is a metal. Then a silver coin will conduct electricity.

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Answer : The total time it takes is, 57 min

Explanation :

Half-life = 19 min

First we have to calculate the rate constant, we use the formula :

[tex]k=\frac{0.693}{19\text{ min}}[/tex]

[tex]k=0.0365\text{ min}^{-1}[/tex]

Now we have to calculate the time taken for decay.

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant

t = time taken top decay  = ?

a = initial pressure of the reactant  = 1.0 atm

a - x = pressure left after decay process  = 0.125 atm

Now put all the given values in above equation, we get

[tex]t=\frac{2.303}{0.0365}\log\frac{1.0}{0.125}[/tex]

[tex]t=57min[/tex]

Therefore, the total time it takes is, 57 min

Final answer:

For a first-order reaction with a constant half-life, three half-lives occur when the concentration goes from 1.0 atmosphere to 0.125 atmosphere. Each half-life is 19 minutes, totaling 57 minutes, leading to the closest total time being C) 76 minutes.

Explanation:

The question involves a first-order reaction where the half-life remains constant. To find the time it takes for the partial pressure of cyclopropane to decrease from 1.0 atmosphere to 0.125 atmosphere, we need to calculate the number of half-lives that occur in this change.

The concentration decreases by half for each half-life period. Since 1.0 atmosphere going down to 0.125 atmosphere is equivalent to halving the concentration three times (1.0 to 0.5 to 0.25 to 0.125), it takes three half-lives.

Given that the half-life is 19 minutes, the total time would be:
3 half-lives × 19 minutes/half-life = 57 minutes.

Thus, the closest answer to the total time taken for this process is:

(C) 76 minutes

Answer:

7.1 × 10⁹ years (D)

Explanation:

half life of the Uranium-235 = 710 million years

to find the time it will take for the U-235 need to be stored securely to be safe

taken the full percent = 100

100 / 2ⁿ = 0.1 where n is number of half-life it has undergone

100 / 0.1 = 2ⁿ

1000 = 2ⁿ

take log of both side

log 1000 / log 2 = n

n = 9.967 number of half-lives

the number of years it will take = 710 million × 9.967 number of half-lives = 7075.7 × 10⁶ years approx 7.1 × 10⁹ years

The correct option is D. [tex]7.1 \times 10^9 years[/tex]

[tex]100 \div 2^n = 0.1[/tex]

here n is number of half-lives it has undergone

[tex]100 \div 0.1 = 2^n\\\\1000 = 2^n[/tex]

Now

take log of both side

[tex]log 1000 \div log 2[/tex] = n

n = 9.967 number of half-lives

Now

the number of years it will take should be

[tex]= 710\ million \times 9.967 \\\\= 7075.7 \times 10^6 \\\\= 7.1 \times 10^9 years[/tex]

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Answer:

0.5 atm is equal to 380mmHg.

Explanation:

For every 1 atm, it is equal to 760mmHg.

Therefore, 0.5 atm is 760/2, which is 380mmHg.

Answer:

Option C is correct.

The minimum amount of material that is needed for a fission reaction to keep going is called the critical mass.

Explanation:

Nuclear fission is the term used to describe the breakdown of the nucleus of a parent isotope into daughter nuclei.

Normally, the initial energy supplied for nuclear fission is the energy to initiate the first breakdown of the first set of radioactive isotopes that breakdown. Once that happens, the energy released from the first breakdown is enough to drive further breakdown of numerous isotopas in a manner that leads to more energy generation.

But, for this to be able to be sustained and not fizzle out, a particular amount of radioactive material to undergo nuclear fission must be present. This particular amount is termed 'critical mass'

Hope this Helps!!!

Answer: B) DC flows in one direction, and AC repeatedly switches directions.

Explanation:

DC stands for direct current, which is a current that constantly flows in only one direction.

AC stands for alternating current, which is a current that repeatedly changes directions.

GOOD LUCK! :)

Direct Current (DC) flows in one direction while Alternating Current (AC) flows by continuously changing its direction.

The difference between Alternating Current (AC) and Direct Current (DC) lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or 'directly'.

AC is a bit different; electrons keep swapping directions, sometimes going forwards and then going backwards.

Therefore, the answer to your question 'Which best compares AC and DC?' would be option D: DC flows in one direction, and AC repeatedly switches direction.

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Answer:

Polar Jet stream

Explanation:

Polar Jet stream is also called the polar front jet or mid latitude jet steam, it is a very powerful belt of the upper level winds which sits above the polar front. It is the strongest wind in the tropopause, it's movement is towards the westerly direction of the mid latitude.

Answer:

hi! the answer is:

m/s

Km/h

mph

Explanation:

hope this helps!! :)

Answer:

4.2 L O₂ is needed to completely react with 2.8 L hydrogen sulfied.

Explanation:

Without pressure and temperature we cannot calculate the this vale

We assume that the reaction  take place under standard Temperature and Pressure(STP).

At STP, One mole ([tex]6.023\times 10^{23}[/tex] particles) of any gas occupied volume 22.4 L.

The balanced equation of this reaction is

[tex]2H_2S+3O_2\rightarrow 2SO_2+2H_2O[/tex]

Now we use molar ratio.

[tex]2.8L\ H_2S . \ \frac{1 mol\ H_2S}{22.4L \ H_2S}\ . \ \frac{3 mol\ O_2}{2 mol \ H_2S} \ . \ \frac{22.4L\ O_2}{1 mol\ O_2}[/tex]

=4.2 L O₂

4.2 L O₂ is needed to completely react with 2.8 L hydrogen sulfied.

Final answer:

To determine the volume of oxygen needed to react with 2.8 liters of hydrogen sulfide, the stoichiometric ratio from the chemical equation is used, revealing that 4.2 liters of oxygen is required for complete reaction.

Explanation:

Stoichiometry of Hydrogen Sulfide and Oxygen Reaction

The question involves the stoichiometric relationship between hydrogen sulfide and oxygen gases during a chemical reaction. The balanced chemical equation for the reaction between hydrogen sulfide (H₂S) and oxygen (O₂) to produce sulfur dioxide (SO₂) and water (H₂O) is:

2H₂S(g) + 3O₂(g) → 2SO₂(g) + 2H₂O(g)

To find the volume of oxygen needed to react with 2.8 liters of hydrogen sulfide, we use the stoichiometric coefficients from the balanced equation, which tell us that 2 volumes of H₂S react with 3 volumes of O₂.

This gives us a ratio of:

2H₂S : 3O₂

Using this ratio, we can find the volume of oxygen required by setting up the proportion:

(2.8 L H₂S) / (2L H₂S) = (x L O₂) / (3L O₂)

Solving for x, we get:

x = (2.8 L H₂S) × (3L O₂) / (2L H₂S)

x = 4.2 L O₂

Therefore, 4.2 liters of oxygen gas is needed to completely react with 2.8 liters of hydrogen sulfide gas.