7. State the mass of the solute required to prepare 125 mL of 0.25 M Ba(NO3)2 solution.

Answer:

k im silly frrr lol have a great day

False.

Arteries are said to be more muscular.

That means Arteries ARE* MUSCLES

Answer:

A formula car is a single seat, open cockpit, open wheel racing car with substantial front and rear wings and an engine positioned behind the driver intended to be used in competition.

Due to its higher oxygen content and based on its structure dietheylene glycol has a higher energy efficiency (cal/g) compared to isopropanol and paraffin wax.

The calorific value of a fuel is the amount of heat energy released from the combustion of the fuel under standard conditions.

Dietheylene glycol, isopropanol and paraffin wax are all used as fuels.

However, due to it higher oxygen content and based on its structure, diethethylene glycol has a higher calorific value than either isopropanol or paraffin wax.

Therefore, dietheylene glycol has a higher energy efficiency (cal/g) compared to isopropanol and paraffin wax.

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How will you describe the pattern as electrons are distributed?

In a simple way, you can say, electrons are arranged around an atom's nucleus.

When electrons are near the nucleus, have the lowest energy. Electrons further aways will have higher energy.

We can say electrons are in different shells with different energy. Inside those shells, electrons are in subshells too.

Then you have some numbers that describe the completly characteristics of an electron in an atom.

They are called Quantum Numbers. They are four

1) The principal Quantum number (n): describes the energy of an electron and the most probable distance of the electron from the nucleus. In other words, it refers to the size of the orbital and the energy level an electron is placed in.

2) The number of subshells or (l): describes the shape of the orbital. It can also be used to determine the number of angular nodes.

3) The magnetic Quantum number (ml): describes the energy levels in a subshell. (Remember we have shells and inside of them we have subshells)

4) The Spin of the Electron (ms): refers to the spin of the electron which can either be up or down.

True. The presumptive definition of Driving Under the Influence in Florida is having a Blood Alcohol Content (BAC) of .08.

True. In Florida, it is illegal to operate a motor vehicle with a blood alcohol content (BAC) of .08 or higher. This is known as driving under the influence (DUI). The legal limit for DUI in Florida is .08.

If a driver is found to have a BAC of .08 or higher, they can be arrested for DUI. Florida also has a Zero Tolerance Law for drivers under 21, meaning that any BAC .02 or higher can lead to an arrest for DUI.

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Complete question:

The presumptive definition of Driving Under the Influence in Florida is having a Blood Alcohol Content (BAC) of .08. true or false

A bond between 2 atoms as being covalent an electronegativity difference of greater than 1.7 between the atoms.

Bond is a debt instrument, which is issued by governments and corporations. These bonds are used to raise capital for various projects and investments. Bonds are a form of loan and investors are usually paid a fixed interest rate for lending their money. Bonds are typically issued for a fixed period of time, usually for a period of 5-30 years, and have a fixed maturity date. Investors receive interest payments at regular intervals and receive the principal amount of the bond at the end of the period.

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Answer:

sdfhioupsdfiuhikdfjsdfhsdksdflk";d089sdfojskdfk

pls give brainlyest

Explanation:

200 IQ intellectual right here ^^

Answer: B) 0.005 55 cm

Hope you have a blessed day!

Answer:

Boron nitride

Magnified sample of crystalline hexagonal boron nitride

Names

IUPAC name

Boron nitride

Identifiers

CAS Number

10043-11-5 check

3D model (JSmol)

hexagonal (graphite) structure: Interactive image

sphalerite structure: Interactive image

wurtzite structure: Interactive image

ChEBI

CHEBI:50883 check

ChemSpider

59612 check

ECHA InfoCard 100.030.111 Edit this at Wikidata

EC Number

233-136-6

Gmelin Reference 216

MeSH Elbor

PubChem CID

66227

RTECS number

ED7800000

UNII

2U4T60A6YD ☒

CompTox Dashboard (EPA)

DTXSID5051498 Edit this at Wikidata

InChI

SMILES

Properties

Chemical formula BN

Molar mass 24.82 g·mol−1

Appearance Colorless crystals

Density 2.1 (h-BN); 3.45 (c-BN) g/cm3

Melting point 2,973 °C (5,383 °F; 3,246 K) sublimates (cBN)

Solubility in water insoluble

Electron mobility 200 cm2/(V·s) (cBN)

Refractive index (nD) 1.8 (h-BN); 2.1 (c-BN)

Structure

Crystal structure hexagonal, sphalerite, wurtzite

Thermochemistry

Heat capacity (C) 19.7 J/(K·mol)[1]

Std molar

entropy (So298) 14.8 J/K mol[1]

Std enthalpy of

formation (ΔfH⦵298) -254.4 kJ/mol[1]

Gibbs free energy (ΔfG˚) -228.4 kJ/mol[1]

Hazards

GHS labelling:

Pictograms GHS07: Exclamation mark

Signal word Warning

Hazard statements H319, H335, H413

Precautionary statements P261, P264, P271, P273, P280, P304+P340, P305+P351+P338, P312, P337+P313, P403+P233, P405, P501

NFPA 704 (fire diamond)

NFPA 704 four-colored diamond

000

Related compounds

Related compounds Boron arsenide

Boron carbide

Boron phosphide

Boron trioxide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

☒ verify (what is check☒ ?)

Infobox references

Explanation:

Boron nitride is a thermally and chemically resistant refractory compound of boron and nitrogen with the chemical formula BN. It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice. The hexagonal form corresponding to graphite is the most stable and soft among BN polymorphs, and is therefore used as a lubricant and an additive to cosmetic products. The cubic (zincblende aka sphalerite structure) variety analogous to diamond is called c-BN; it is softer than diamond, but its thermal and chemical stability is superior. The rare wurtzite BN modification is similar to lonsdaleite but slightly softer than the cubic form.[2]

Because of excellent thermal and chemical stability, boron nitride ceramics are used in high-temperature equipment. Boron nitride has potential use in nanotechnology.

Boron nitride exists in multiple forms that differ in the arrangement of the boron and nitrogen atoms, giving rise to varying bulk properties of the material.

Amorphous form (a-BN)

The amorphous form of boron nitride (a-BN) is non-crystalline, lacking any long-distance regularity in the arrangement of its atoms. It is analogous to amorphous carbon.

All other forms of boron nitride are crystalline.

Hexagonal form (h-BN)

The most stable crystalline form is the hexagonal one, also called h-BN, α-BN, g-BN, and graphitic boron nitride. Hexagonal boron nitride (point group = D6h; space group = P63/mmc) has a layered structure similar to graphite. Within each layer, boron and nitrogen atoms are bound by strong covalent bonds, whereas the layers are held together by weak van der Waals forces. The interlayer "registry" of these sheets differs, however, from the pattern seen for graphite, because the atoms are eclipsed, with boron atoms lying over and above nitrogen atoms. This registry reflects the local polarity of the B–N bonds, as well as interlayer N-donor/B-acceptor characteristics. Likewise, many metastable forms consisting of differently stacked polytypes exist. Therefore, h-BN and graphite are very close neighbors, and the material can accommodate carbon as a substituent element to form BNCs. BC6N hybrids have been synthesized, where carbon substitutes for some B and N atoms.

There is no reaction between zinc II sulfate and magnesium sulfate.

We know that a reaction is said to occur when two species are combined and there are new products that appear in the system. This implies that if there are no new substances that appear in the system we can not say that a chemical reaction has taken place.

In this case, we can see that we can not be able to observe any change when wee mix a solution of magnesium sulfate and zinc II sulfate since the both of them have the same anion.

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Since most reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. The number of chemicals in a solution can be stated in a variety of ways. The grams of acetic acid is 611.90 g.

The number of moles of dissolved solute per liter of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per milliliter of the solution by dividing the number of moles and the volume by 1000.

The equation which is used to calculate the molarity of two different solutions is:

M₁V₁ = M₂V₂

M₁ = M₂V₂ / V₁

0.300 × 18.53 / 10.00 = 0.55 M

Number of moles = Molarity × volume

n = 0.55 × 18.53 = 10.19

Mass = n × Molar mass = 10.19 × 60.05 = 611.90 g

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Answer:

15 molecules

Explanation:

A balloon contains 7.36 g of oxygen gas (02). How many oxygen molecules

are in the balloon?

The major thermodynamic product of the reaction between C₅H₈ and HBr is the most stable product, which is usually the one with the lowest free energy. On the other hand, the major kinetic product is the product that is formed through a faster and less controlled reaction pathway.

This  thermodynamic product product is formed through a slower and more controlled process, which allows for the formation of stronger chemical bonds and results in a more stable final product.

This  kinetic product  is formed due to its lower activation energy, which makes it easier to form, but it may not necessarily be the most stable product.

In the case of C₅H₈ and HBr, the reaction can result in both thermodynamically and kinetically stable products, meaning that there can be multiple products formed, each with different stability properties. The thermodynamically stable product is the one with the lowest free energy, while the kinetically stable product is the one with the lower activation energy.

In summary, the major thermodynamic product of the reaction is the most stable product, while the major kinetic product is the product that is formed through a faster and less controlled reaction pathway. However, it is important to note that the exact products of the reaction can vary based on the reaction conditions and reactant concentrations.

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Complete question:

What are themajor thermodynamic and kinetic products of the reaction.

C₅H₈ + HBr (1 equivalent) ------> thermodynamically stable + Kinetically stable

Answer:

If those values are in terms of mass, weight or velocity

Kinetic energy will be in the order 180 » 120 » 105

Answer:

105, if you're dealing with the weight of object

Explanation:

It's the amount of speed/movement an object can move. The lighter the weight the more amount of speed it has.

Hope this helps!

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

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Answer:

35

Explanation:

the formula is: mass number = protons + neutrons

so 17+18=35

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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The  Percent Yield=(Actual YieldTheoretical Yield)×100% = 77.3%

A real yield divided by hypothetical yield multiplied by 100 is known as percent yield.Yield Percentage Equals Actual YieldA theoretical yield of 100%There are various reasons why a chemical reaction's theoretical yield might not match its actual yield, and these will be covered in more detail in later chapters of the course.

Percent yield = Actual Yield/Theoretical Yield x 100 is the formula we use to calculate the yield percentage.

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Answer:

It is a finite resource. Fossil fuels such as oil, natural gas, and coal are examples of nonrenewable resources. Humans constantly draw on the reserves of these substances while the formation of new supplies takes eons. Renewable resources are the opposite: Their supply replenishes naturally or can be sustained.

Explanation:

Based on how chemical equations are written, the given chemical reaction: Four atoms of aluminum metal react quickly with 3 molecules of oxygen in the air to produce 2 molecules of aluminum oxide can be written as follows:

Word equation: Aluminum metal + oxygen gas ---> Aluminum oxide

Reactants: Aluminum metal and oxygen gas

Products: Aluminum oxide

Known states of matter: solid + gas ---> solid

Equation: 4 Al (s) + 3 O₂ (g) ---> 2 Al₂O₃ (s)

A chemical reaction is a type of change that results in changes in the chemical properties of substances.

Chemical reactions involve the rearrangement of atoms of substances and result in the formation of new substances.

Chemical reactions can be represented by a chemical equation.

Chemical equations use symbols to represent the reactants and the products of a reaction.

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Answer:

liquid takes the shape of whatever container it is in and have a volume but gas doesn't have a volume

Answer:

liquid because you can take the volume of water and the shape depends on the container

This means that 1 mole of oxygen atoms has a mass of 16 grams.

option C.

A mole is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are in 12 grams of carbon-12, which is an isotope of carbon.

This number is known as Avogadro's number, which is approximately 6.02 x 10²³ entities per mole.

So, when we say "1 mole of oxygen atoms," we are referring to Avogadro's number of oxygen atoms, which is approximately 6.02 x 10²³ oxygen atoms.

Since the atomic mass of oxygen is 16 grams per mole, 1 mole of oxygen atoms would have a mass of 16 grams, which is option C) in the given choices.

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1

1

The general molecular formula for phenol is C6H5OH. It is an aromatic organic compound with a hydroxyl group bonded to a carbon atom of a cyclic structure. The ring structure has alternate double and single bonds. The formula of phenol is C6H5OH. Benzene has the formula C6H6. It is a hexagonal ring of six carbon atoms bonded with alternate single and double bonds. Each carbon atom in benzene has a bond with a hydrogen atom. In phenol, a hydroxyl group replaces one of the hydrogen atoms.

The reaction of CuCl2, HNO3, and AgNO3 is a redox reaction. In a redox reaction, one substance loses electrons and is oxidized, while another substance gains electrons and is reduced. In this reaction, CuCl2 is oxidized to Cu2+, HNO3 is reduced to NO, and AgNO3 is reduced to Ag.

The balanced equation for the reaction is:

CuCl2 + 2HNO3 + 2AgNO3 → Cu2+ + 2NO + 2AgCl

The products of the reaction are copper(II) ions, nitrogen monoxide gas, and silver chloride precipitate.

Here are some of the properties of phenol:

Phenol is a white crystalline solid that is soluble in water.

Phenol has a strong, characteristic odor.

Phenol is a mild acid.

Phenol is toxic and can cause burns to the skin and eyes.

Phenol is used in a variety of products, including disinfectants, antiseptics, and plastics.

Answer:D

Explanation:I did it on study island.

Radio waves are not used to generate medical images because as per the electromagnetic spectrum ,the radio waves  carry little energy that they pass through most atoms without interaction.

The electromagnetic spectrum consists of  radiation  which consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Answer:

Elastic Energy

Explanation:

Elastic energy is the mechanical potential energy stored in the configuration of a material or system as it is subjected to elastic deformation by work performed upon it. Elastic energy occurs when objects are impermanently compressed, stretched or generally deformed in any manner.

The type of energy transfer between the frozen ice cream and the tongue is convection. The frozen ice cream will gradually melt because of the temperature difference.

Convection is the method of heat transfer that involves the transmission of heat in a fluid (liquid or gas) by the circulation of currents.

According to this question, a spoonful of frozen ice cream is placed on the tongue. The heat transfer will occur between the tongue with warmer temperature and the ice cream with colder temperature.

The heat energy will flow from the tongue to the ice cream, hence, making it defreeze or melt with time. This type of heat transfer is convection because it involves a fluid.

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Answer:

hmmm good luck

Explanation: