judy tests a common household substance and finds that it has a ph of 7. what type of substance is in the scenario?

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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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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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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1000 g of water condenses at 100°C in a home radiator (changes from gas to liquid).

Equation

Q=m x Hvap

    where m= mass.

= 1000. gx2260J/g 

Q=2,260,000 J

What is Condensation?

Condensation, which is the opposite of vaporization, is the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase. [1] Another way to describe it is as the transformation of water vapour into liquid water when it comes into touch with a solid, liquid, or cloud condensation nucleus in the atmosphere. Deposition is the term for the change that occurs when the gaseous phase directly transitions into the solid phase.

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consider a phosphate buffer, consisting of h2po4- and hpo42- . initially at the same ph as its pka (6.86) when concentrated sodium hydroxide is added to this buffer, the: Option C  ratio of [hpo42-] to [h2po4] in the buffer increases

The buffer's HPO42-to-H2PO4-ratio increases. Because NaOH reacts with H2PO4- and academic papers proton for neutralisation. Buffer Solution is a liquid solvent-based solution made up of a weak acid base, or a weak base and its conjugate acid. They are resilient to pH changes caused by dispersion or the addendum of small quantities of acid/alkali to companions. Water acts as a buffer, albeit a poor one. This is because of the fact that H20 ionises to shape H30+ and OH-. A weak acid and the conjugate acid are required to form an acid solution buffer. For alkali, the opposite is true.

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Answer:

[tex] \huge{ \boxed{0.255 \: \text{moles}}}[/tex]

Explanation:

To find the number of moles of a solution given it's volume and concentration/molarity, we use the formula;

[tex] \bold{c = \frac{n}{v}} \\ [/tex]

where

Since we're finding the number of moles, we make n the subject

[tex] \bold{n = c \times v}[/tex]

From the question;

[tex]n = 3 \times 0.085 = 0.255[/tex]

We have the final answer as

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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1.56% of the original sample would be left after 108 days.

What are radioactive element?

The atoms that make up radioactive elements have unstable nuclei, and as a means of achieving stability, they emit atomic radiation. Radioactive atoms are converted into another chemical element through radiation emission, which can either make the element stable or radioactive enough to cause additional decay.

Due to the extra nuclear charge present inside of some atomic nuclei, these unstable elements undergo radioactive decay to generate stable nuclei. These substances are referred to as radioactive substances.

Therefore, 1.56% of the original sample would be left after 108 days.

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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.

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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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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The name is copper bromide.

Explanation:

copper bromide is the aswer

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 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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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.

The number of gas moles of molar mass 18g is 0.010moles.

Molar Mass is 18g and RMS speed 657 m/s , Kinetic energy is 42kj

42000=m(675 x 675)/2

m=84000/675²

=0.1843g

To find number of moles -

[tex]n=m/M[/tex]

n=calculated mass/Molar Mass

=0.010 moles

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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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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 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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An unknown compound is xy has the x-to-y mass of ratio of 4.0. the decomposition of the compound xy will gives 20.0 grams of x, and  then will give grams of y  form is 5 g.

given that :

x/y = 4

The decomposition of the compound of xy will produces of x is = 20 g

mass of x = 20 g

therefore, x / y = 4

by cross multiplying   given equation we get :

x = 4y

y = x / 4

y = 20 / 4

y = 5 g

Thus, the mass of y will produces is given as follows :

y = 5 g.

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Answer:

metalloid

Explanation:

Silicon. Silicon (symbol Si) is a group 14 metalloid.

The change in internal energy for a molecule at 56 g/mol is discovered to be -539 kJ/mol.

The internal energy change of a reaction is represented by the symbol U. U = Heat of calorimeter + Heat of solution for a reaction in the bomb calorimeter.

Heat capacity = Heat Temperature

For example, 0.48 g compound U = 3.81 0.285 + 4.184 3000 0.28 g compound U = 4.67 kJ

For a molecule at 56 g/mol

U equals energy/mass/moles/one, where U = 4.67/0.48556 and U = 539 kJ/mol.

Since the reaction causes a temperature increase, the internal energy, or -539kJ/mol, is given a negative sign.

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The lungs, bronchi, and trachea seem to be cross-sectioned in the photo (windpipe). The respiratory system supplies oxygen and removes carbon dioxide, a waste product of cellular activity. The trachea transports air from the nose and mouth to the bronchi, which go to the lungs. The lungs exchange gases with the environment via breathing.

Generally, The picture appears to show a cross-section of the human respiratory system, including the lungs, bronchi, and trachea (windpipe). The respiratory system is responsible for bringing oxygen into the body and removing carbon dioxide, a waste product of cellular metabolism.

The trachea is a tube that carries air from the nose and mouth to the bronchi, which are smaller tubes that branch off from the trachea and lead to the lungs.

The lungs are the primary organs of the respiratory system and are responsible for exchanging gases with the environment through the process of breathing.

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Answer: B

Explanation:

The pH of an acidic buffer that contains equal concentrations of HC2H3O2 and NaC2H3O2 is 4.8.

These solutions are employed to keep environments acidic, as their name suggests. A weak acid and its salt are combined with a strong base to create an acid buffer, which has an acidic pH. The pH of an acetic acid and sodium acetate solution in water is equivalent at 4.74.

These solutions have PH values below seven.

These solutions are made up of a weak acid and its salt.

A mixture of sodium acetate and acetic acid (pH = 4.75) serves as an illustration of an acidic buffer solution.

Given;

Pka of acetic acid is 4.8;

conc of ch3cooh = conc of ch3cooNa;

now,

[salt]/[acid] = 1

now from the formula,

PH =  Pka + log([tex]\frac{conc of salt}{conc of acid}[/tex])

⇒PH = 4.8 + log(1)

⇒PH = 4.8 + 0

PH = 4.8

The pH of an acidic buffer that contains equal concentrations of HC2H3O2 and NaC2H3O2 is 4.8.

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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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Answer:

14.43 moles

Explanation:

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

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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Based on the recipe for preparing the food, the limiting ingredient is the 2 cans of tomatoes.

The recipe for the food is given below:

Hence, 2 cans of diced tomatoes require 1 cup of green beans, 1/2 cup of pasta, 1 can of beans, and 4 of cups broth.

Hence, after, the 2 cans of diced tomatoes are used up, no more food can be prepared.

A limiting reagent or limiting ingredient is used up when cooking, hence, the 2 cans of tomatoes are the limiting ingredient.

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Answer:

2Mg (s) + O² (g) --> 2MgO (s)

Explanation:

the product is magnesium oxide