an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as

The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours

We know that speed is defined as the distance travelled per time as shown below:

Speed = Distance / time

With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:

Speed = Distance / time

5.6 = 25 / time

Cross multiply

5.6 × time = 25

Divide both sides by 5.2

Time = 25 / 5.2

Time = 4.8 hours

This, the time taken is 4.8 hours

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The volume of nitric acid needed to titrate calcium hydroxide is 100.0 mL.

The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂)

2 HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2 H₂O

Calculate the number of moles Ca(OH)₂

n = MV

n Ca(OH)₂ = MV = 0.01000 × 125.0 = 1.25 mmol

According to Avogadro's law, the ratio of the coefficients of each element is equal to the ratio of the number of moles.

n Ca(OH)₂ : n HNO₃ = 1 : 2

1.25 : n HNO₃ = 1 : 2

n HNO₃ = 1.25 × 2 = 2.50 mmol

Calculate the volume of HNO₃

V = n ÷ M

V = 2.50 mmol ÷ 0.02500 M

V = 100.0 mL

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Answer:

NA atoms

6.02 × 10²³ atoms

Answer:SO2 dissolves in water and forms dipole-dipole attractions with the water molecules.

Explanation:

i got it right

The statement best describes what occurs when a polar molecule like so2 is mixed with water is so2 dissolves in water and forms dipole-dipole attractions with the water molecules. Therefore, option B is correct.

A polar molecule is one that has a slight positive charge on one end and a slight negative charge on the other. A polar molecule is a diatomic compound, such as HF, that contains a polar covalent link.

The molecule's form is to blame for this. Polar molecules include those in water. Inside the molecule, there are two polar bonds. The twisted, non-symmetrical structure of the molecule results in its polar nature (it has a and side).

A water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole due to the unequal sharing of electrons between the atoms and the asymmetrical form of the molecule (side).

Thus, option B is correct.

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Answer:Water is unusual because its molecules move further apart when it freezes. The molecules of just about every other substance move closer together when they freeze.

Explanation:

During freezing, water molecules lose energy and do not vibrate or move around as vigorously. This allows more stable hydrogen-bonds to form between water molecules, as there is less energy to break the bonds.

The product of this reaction is calcium chloride (CaCl2) and hydrogen gas (H2).

For this reaction, we have single displacement reaction.

What is a single displacement reaction?

A single displacement reaction is a type of chemical reaction in which one element exchanges its place with another element in a compound. This type of reaction is also known as a single replacement reaction or a substitution reaction. In a single displacement reaction, the elements involved must be different. Examples of single displacement reactions include the reaction between magnesium and hydrochloric acid to produce magnesium chloride and hydrogen gas, and the reaction between zinc and sulfuric acid to produce zinc sulfate and hydrogen gas.

In this reaction, Calcium (Ca) metal is seen reacting with Hydrochloric acid (HCl). The Ca replaces the H in HCl and we end up with CaCl2 and H2.

The resulting reaction is CaCl2 + H2.

The complete reaction is:

Ca + 2HCl ---> CaCl2 + H2

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The name is copper bromide.

Explanation:

copper bromide is the aswer

The absorptions would you expect to observe in the ¹³C NMR spectra of the  molecules a)  2-Methyl-2-butene is 5 signals

b) trans-1,3-Dimethylcyclohexan is 8 signals.

The proton which have equivalent chemical environment will gives one signal in ¹³C NMR. the ¹³C NMR signals will tell us about the number of different set of carbon which is in equivalent environment.

a)  2-Methyl-2-butene - in this compound there are 5 carbon atoms present . all the 5 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 5 signals.

b) trans-1,3-Dimethylcyclohexan -  in this compound there are 5 carbon atoms present . all the 8 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 8 signals.

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Answer:

2Mg (s) + O² (g) --> 2MgO (s)

Explanation:

the product is magnesium oxide

The IUPAC name for C2H5 is ethyl radical.

Ethyl is a Radical formed from Ethane. Ethane is a chemical compound, which is a colorless and odorless gas. It is a non-polar dispersion force.

Ethyl is also known as ethyl alcohol or ethanol. It is a flammable liquid that is toxic. It is used by medical practitioners, mainly in hand sanitizers.

Ethyl is an organic hydrocarbon molecule. IUPAC is an international federation that represents chemistry and its related tools and techniques. It is a part of the International Science Council, and helps in designing various chemical structures, names  and standards.

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Answer:

14.43 moles

Explanation:

I don't know... the interwebz said soz

The factor that has been causing the co2 level of the atmosphere to increase over the past 200 years are:

The primary cause of the rise in carbon dioxide concentrations is the use of fossil fuels by humans as a source of energy. We are adding carbon to the atmosphere in only a few hundred years that plants removed from the atmosphere through photosynthesis over many millions of years in the form of fossil fuels like coal and oil.

Note that according to climate experts, the earth is currently 1 degree Celsius hotter than it was between 1850 and 1900, and part of the reason for this is due to gas emissions from airplanes, cars, and other human activities.

Hence, one can say that Greenhouse gas concentrations have increased due to human activity. Burning fossil fuels like coal and oil has increased the amount of carbon dioxide in the atmosphere during the past century (CO2).

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See full question below

What has been causing the CO2 level of the atmosphere to increase over the past 200 years?

Select all that apply.

Hint 1. How CO2 Is Not Released into the Atmosphere

If carbon dioxide is absorbed by another material, then that carbon dioxide is sequestered from the atmosphere unless something happens to release it from the absorbing material.

An oxygen tank used in a hospital setting has a pressure of 4.0 atm and contains 60.0% O₂ and 40.0% N₂  by volume. the partial pressure of oxygen in the tank is 2.4 atm

given that :

the total pressure of gas = 4 atm

percent by volume of oxygen = 60.0 % = 0.6

percent by volume of nitrogen = 40 % = 0.4

According to the Dalton's law of partial pressure is given as :

Partial pressure = mole fraction of gas × P total

Partial pressure of O₂  = 0.6 × 4

Partial pressure of O₂ = 2.4 atm

Thus, the partial pressure of the oxygen gas is 2.4 atm.

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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.

Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )

On converting the kinetic energy to atomic mass we get:

4.01 MeV/931.5 MeV/u = 0.0043048 u

The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.

Therefore,

The remaining mass = 238.050783 - (4.002602 + 0.0043048)

= 234.0438762 u

The remaining mass = 234.04u

Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.

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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.

Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )

On converting the kinetic energy to atomic mass we get:

4.01 MeV/931.5 MeV/u = 0.0043048 u

The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.

Therefore,

The remaining mass = 238.050783 - (4.002602 + 0.0043048)

= 234.0438762 u

The remaining mass = 234.04u

Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.

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The percent yield of the magnesium oxide in this context is 87.3%.

We know that the percentage yield has to do with the amount of the product that we get from the reaction expressed as a percentage. We know that the combination of the magnesium and the oxygen molecule would lead to the formation of the magnesium oxide.

The oxygen and the magnesium are the reactants while the magnesium oxide is the product.

Mass of magnesium = Mass of magnesium and crucible - mass of crucible

= 38.06 g - 35.67 g

= 2.39 g

Number of moles of Mg =  2.39 g/24 g/mol

= 0.0996 moles

Mass of magnesium oxide =  Mass of magnesium oxide and crucible - mass of crucible

= 39.15 g - 35.67 g

= 3.48 g

Number of moles of the magnesium oxide = 3.48 g/40 g/mol

= 0.087 moles

From the reaction;

2 moles of Mg produces 2 moles of MgO

Hence the theoretical yield of the Mgo is 0.0996 moles

Percent yield = Actual yield/ Theoretical yield * 100/1

= 0.087 moles/ 0.0996 moles * 100/1

= 87.3%

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The limiting reagent in the process is carbon dioxide, and the theoretical yield is 360 g.

Moles = given mass divided by molecular mass (1)

For LiOH:

LiOH has a mass of 1.00 103 g.

LiOH has a molar mass of 23.95 g/mol.

Equation 1 is solved with the following values: Moles of LiOH = 1.00103g/23.95g/mole=41.75mole

For carbon dioxide: Given mass of carbon dioxide = 8.8×10²g

Carbon dioxide has a molecular mass of 44 g/mol.

Equation 1 is solved with the following values: Moles of carbon dioxide = 8.8 102 g/44 g/mole = 20 moles.

The following is the chemical formula for the reaction between carbon dioxide gas and lithium hydroxide:

2LiOH(s)+Co2(g)⇒Li₂Co₃(s)+H²O(l)

Using the reaction's stoichiometry:

2 moles of lithium hydroxide and 1 mole of carbon dioxide react.

Thus, the reaction between 20 moles of carbon dioxide.

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Volume of solution is used to calculate molarity of a 1 molal sodium chloride solution. The correct option to this question is A.

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IUPAC name for Rust is Iron (III) Oxide. Its common name is corrosion mostly seen in iron or steel.

Rust is the common name for iron oxide. The most familiar form of rust is the reddish coating that forms flakes on iron and steel (Fe2O3) but rust also comes in other colors including yellow, brown, orange, and even green. The different colors reflect various chemical compositions of rust. Rust specifically refers to oxides on iron or iron alloys such as steel. There is tarnish on silver and verdigris on copper. The chemical name of rust is iron oxide is iron (III) oxide. The familiar red form of rust is Fe2O3. but iron has other oxidation states, so it can form other colors of rust. Rust forms when iron or its alloys are exposed to moist air. The oxygen and water in air react with the metal to form the hydrated oxide.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.98grams are present in  45.73 moles of  BCl[tex]_3[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

Mathematically,

number of moles of  BCl[tex]_3[/tex] =given mass of BCl[tex]_3[/tex] ÷ molar mass of BCl[tex]_3[/tex]

Molar mass of 1 mole of BCl[tex]_3[/tex] = 46.264 g/mol

number of moles of  BCl[tex]_3[/tex] = 45.73 moles

Substituting all the given values in the above equation, we get

45.73 moles =mass of BCl[tex]_3[/tex]÷46.264 g/mol

mass of BCl[tex]_3[/tex]   =0.98grams

Therefore, 0.98grams are present in  45.73 moles of  BCl[tex]_3[/tex].

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The percent yield of iron is, 86.5 %

Given,

Moles of iron(III)oxide = 0.450 mole

Mass of iron = Actual yield of Fe = 43.6 g

First we have to calculate the moles of iron.

The balanced chemical reaction is,

2Al+ 2 Fe₂O₃ --> 2Fe + Al₂O₃

From the balanced reaction we conclude that

As, 1 mole of Fe₂O₃ react to give 2 mole of Fe

So, 0.450 mole of Fe₂O₃ react to give 2/1 x 0.450 = 0.9 moles of Fe

Now we have to calculate the mass of Fe.

Mass of Fe = Moles of Fe x Molar mass of Fe

Mass of Fe = (0.9mole) x (56g/mole)= 50.4g

Therefore, the mass iron produces, 50.4 g

Now we have to calculate the percent yield of Fe.

% yield of Fe = (Actual yield of Fe/ Theoretical yield of Fe) x 100%

                     = 43.6g/50.6g x 100% = 86.5%

Therefore, the percent yield of Fe is, 86.5 %

The question whose answer is given:

If 0.450 moles of iron III oxide (Fe2O3) are allowed to react with an excess of aluminum (Al) and 43.6 grams of iron (Fe) is produced, what is the percent yield of iron?

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The energy released by the phase change of a substance  can be calculated using calorimetric equation. The energy released during conversion D from gas to solid at the specified condition is 496.58 kJ.

Calorimetry is an analytical tool used to determine the heat energy released or absorbed by a chemical or physical change. The calorimetric equation connecting the heat energy q with mass of the substance m, specific heat c and the temperature difference ΔT is written as:

q = m c ΔT .

Specific heat of the gas= 0.5 J/ g ° C

mass m = 360.5 g

temperature difference = (184 -(-91)) =275°C.

heat released q = 360.5 g × 275°C ×   0.5 J/ g ° C

                           =  49658.87J

                           = 496.5 kJ

Therefore, the heat energy released from the given phase change is 496.5 kJ.

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Pair production is the process by which a neutral boson is converted into a subatomic particle and its antiparticle.

The mass of the electron has an energy equivalent of 0.51, and the mass of the positron has an energy equivalent of 0.51 as well. Thus, the mass of the particles in the pair is produced using a total of 1.02 energy. The two particles share the remaining energy, 1.24, equally as kinetic energy.

The newly created positron is quickly converted back into photons after annihilating with another electron in matter.

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For a fundamental breakdown of how to fix problems and lead your manufacturing team to success, here are the two steps of the problem-solving process.

Identify the Problem.

Define the Problem.

The eight-step problem-solving process is a structured method that guides you through the various steps of solving issues.

Unlike other problem-solving processes that are often broad, the eight-step method takes you through each individual step, from identifying the problem to taking actionable steps to success.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.

Therefore, the correct option is option A.

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Internal energy of the system is 1278 kJ.

What is Internal Energy?

It refers to the intangible microscopic energy at the atomic and molecular scales, which is distinct in scale from the macroscopic organised energy associated with moving objects. For instance, a glass of water on a table at room temperature appears to have no apparent energy, either potential or kinetic.

∆U = w + q

U = modification of internal energy =?

W = work equals +425 kcal (positive sign because work is done on the system)

lthough I'm not sure you intended to use separate units (kcal and kJ), I'll presume you did so in order to solve the problem. Don't convert them if they should be the same, such as in the case of kJ.

425 kcal plus 4.184 kJ per kcal equals 1778 kJ of labor, or w.

∆U = +1778 + (-500 kJ) (-500 kJ)

∆U = +1278 kJ

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Using a ball and stick figure, it is easy to visualize the atoms and the two pairs of electrons they share.

Each atom ball would be connected to another one by two bonds stick on each side of it.

What is bonding model for semiconductor?

The bonding model is mostly used to have a basic idea of what the individual electrons are doing in semiconductor. Structure of crystalline material is uniform.

Detailed solution is in attached file

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Answer: B

Explanation:

The mass of gallium that can be formed from the reaction of 198 g of strontium with excess molten gallium (III) nitrate is 105 g (Option C)

The mass of gallium that can be formed from the reaction can be obtained as follow:

3Sr + 2Ga(NO₃)₃ → 3Sr(NO₃)₂ + 2Ga

From the balanced equation above,

262.86 g of Sr reacted to form 139.44 g of Ga

Therefore,

198 g of CrCl₂ will react to form = (198 × 139.44 ) / 246.86 = 105 g of Ga

Thus, the mass of Ga formed is 105 g (Option C)

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Explanation:

ΛЛらƜƐ尺 :-

A matter is made up of Tiny particles which contain mass, and are too small to be seen. Option B is the correct answer.

A matter consists of atoms and consist of protons, neutrons, and electrons. Both the protons and neutrons are placed in the nucleus, which is the center of an atom.

Matter can occupy space and has mass, and matter consists of many phases and it can take different forms. The matter is generally in the form of a solid, liquid, or gas.

The matter is also made up of tiny particles called atoms!

There are three main states of matter They are, solid, liquid, and gas. Water is one of the substances that exist in all three states.

1. SOLID:

Examples of solids are: metals, wood

2. LIQUID:

Examples of liquids: are water and oil.

3. GAS:

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