Of the following waves, which kind of wave does NOT require a medium?
a. light
b. water
с. ultrasound
d. sound

Answer:

Because a statistic is based on data gathered through random sampling, which is a random experiment, it is a random variable. Therefore, Luisa's observations would prove more useful to a chemist.

Explanation:

The new net worth of the person is equal to 80.2 × 10⁹.

Significant figures can be used to generate numbers that will be written in the form of digits. We can also evaluate the number of significant digits by counting the numbers from the 1st non-zero digit placed on the left.

In the case of addition or subtraction, the number of significant figures will be the same as the value with the fewest significant digits.

Given, the net worth of the person, A = 77 billion = $ 77 × 10⁹

The person's stock gains in the following year, I = $ 3.20 billion

I = $ 3.20 × 10⁹

The new net worth of the person, A(new) = A + I

A (new) = 77 × 10⁹ + 3.20 × 10⁹

A (new) = $ 80.2 × 10⁹

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AlCl3-CH3Cl is the right response, 1) 2) HNO3 and H2SO4 at ambient temperature 3) HNO3-H2SO4 fuming at temperatures of 90–100 0 C. I believe that benzene is being converted in this process to 2,4,6-trinitrotoluene.

A reagent is a chemical or combination that is used to determine if another material is present or absent, typically by observing a change in color, or to calculate the concentration of a substance.

In the field of chemical chemistry, a reagent is defined as "a material or compound given to a system in order to bring about a chemical reaction or is added to verify whether a reaction has happened or not." The presence of another chemical can be detected and confirmed using a response like this.

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The following compound: CH3CH2CH3 is propane and this a hydrocarbon and is alkane. Propane seems as a drab fueloline with a faint petroleum-like odor.

The vapors are heavier than air and a flame can flash returned to the supply of leak very easily. The leak can be both a liquid or vapor leak. The vapors can asphyxiate through the displacement of air. Under extended publicity to hearthplace or warmness the boxes might also additionally rupture violently and rocket.

CH3 CH2 CH3 is a compound referred to as a hydrocarbon, greater in particular an alkane. The not unusualplace call for this compound is propane, that is a form of fueloline extensively used as a gasoline supply. It is a hydrocarbon as it includes best hydrogen and carbon atoms.

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The standard cell potential (also known as the standard electrode potential) is a measure of the potential difference between two electrodes in an electrochemical cell under standard state conditions.

(a) Standard Cell Potential for Mg(s) + Ni2+(aq)⟶ Mg2+(aq) + Ni(s):

E0cell = (0.79 - (-0.25))V = 1.04 V.

This reaction is spontaneous under standard state conditions.

(b) Standard Cell Potential for 2Ag+(aq) + Cu(s)⟶ Cu2+(aq) + 2Ag(s):

E0cell = (0.34 - (-0.52))V = 0.86 V.

This reaction is spontaneous under standard state conditions.

(c) Standard Cell Potential for Mn(s) + Sn(NO3)2(aq)⟶ Mn(NO3)2(aq) + Sn(s):

E0cell = (0.15 - (-0.14))V = 0.29 V.

This reaction is spontaneous under standard state conditions.

(d) Standard Cell Potential for 3Fe(NO3)2(aq) + Au(NO3)3(aq)⟶ 3Fe(NO3)3(aq) + Au(s):

E0cell = (1.23 - (-1.50))V = 2.73 V.

This reaction is spontaneous under standard state conditions.

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The U.S. Environmental Protection Agency (EPA) is proposing national emission standards for hazardous air pollutants (NESHAP) for the miscellaneous organic chemical manufacturing (MOCM) source category.

What are Air pollutants?

Air pollutants are substances in the air that can have negative impacts on the environment, human health, and the planet. Common air pollutants include ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead.

The proposed standards would include national emission limits for hazardous air pollutants (HAP) and work practice standards to reduce emissions of HAP from existing and new MOCM sources. The proposed standards would also require risk and technology reviews to ensure that residual risk to human health and the environment is minimized and that the most stringent emission limits and work practice standards are implemented. The technology review would include a review of available control technologies, as well as a review of the remaining health and environmental risks after controls are implemented. The risk review would consider the overall risk to public health and the environment from the MOCM source category, including both source-specific and cumulative risk. The proposed standards would also require compliance demonstrations, periodic monitoring, recordkeeping, and reporting.

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b) Raincoats, gumboots, woollen gloves will most probably be used by Rajat in rainy and partly and cloudy weather.

The raincoat is easy to manage and mouldable on a cloudy day we can carry it in your bag easily, whereas the umbrella is hard to handle if you drive.

Gumboots help us in the cool climate they can be able to cover our feet from the water on roads. If you have woollen gloves, they will help you to guard your hands and makes you feel warm, which you need in cold and rainy weather. Carrying a pair of woollen gloves in cold weather is helpful.

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The order of elution in reversed-phase HPLC is different from that in a normal-phase separation, with more polar solutes eluting first. The mobile phase's polarity is increased to produce longer retention periods.

A method in analytical chemistry called high-performance liquid chromatography, formerly known as high-pressure liquid chromatography, is used to separate, recognize, and quantify each component in a mixture.

To obtain a consistent increase in the organic solvent (usually methanol or acetonitrile) over the course of the study, gradients in reversed-phase HPLC typically use on-line (dynamic) mixing of solvents. This increases the elution strength of the eluent over time.

Thus, In contrast to the normal phase HPLC, which employs a polar stationary phase and a less polar mobile phase, the reverse phase HPLC makes use of a nonpolar stationary phase and a polar mobile phase.

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Answer:

At equilibrium, the partial pressure of a gas is equal to the product of its equilibrium constant and the partial pressure of the other gases it reacts with. In this case, the equilibrium constant is given as K=6.9×10−6 at 1000 K, and the partial pressure of SO2 and Cl2 are both 0.760 bar. Therefore, the partial pressure of SO2Cl2 at equilibrium is:

6.9×10−6 * 0.760 bar * 0.760 bar = 4.3×10−8 bar

So the partial pressure of SO2Cl2 at equilibrium is 4.3×10−8 bar.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. To solve such this we must know the concept of equilibrium reaction. Therefore, the partial pressure of SO[tex]_2[/tex]Cl[tex]_2[/tex] at equilibrium is 4.3×10⁻⁸bar.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

The balanced equation can be written as

SO[tex]_2[/tex](g)+Cl[tex]_2[/tex](g)⇌SO[tex]_2[/tex]Cl[tex]_2[/tex](g)

K=partial pressure of SO[tex]_2[/tex]Cl[tex]_2[/tex] ÷(partial pressure of SO[tex]_2[/tex] × partial pressure of Cl[tex]_2[/tex] )

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

6.9×10⁻⁶ = (0.760 bar × 0.760 bar)÷partial pressure of SO[tex]_2[/tex]Cl[tex]_2[/tex]

              = 4.3×10⁻⁸bar

Therefore, the partial pressure of SO[tex]_2[/tex]Cl[tex]_2[/tex] at equilibrium is 4.3×10⁻⁸bar.

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All of the gated potassium and sodium channels are shut off during the resting state (the period preceding an action potential).

A little amount of sodium is needed by the human body to convey nerve impulses, contract & relax muscles, and keep the right ratio of water and minerals. We are thought to require 500 mg of sodium everyday for these essential processes.

Many foods include the mineral sodium. Your body needs salt to maintain healthy neuron and muscle function. The balance of body fluids is also maintained. Sodium chloride is used to make the majority of table salts. Therefore, salt used to season or prepare food typically contains sodium.

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Answer:

a. 2KClO3 → 2KCl + 3O2

Explanation:

The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.

What are formal charges?

Formal charge (FC) is the charge associated with the atoms in a molecule, assuming that the electrons of all chemical bonds are shared equally between atoms, regardless of their relative electronegativities. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

In chemistry, the formal charge in the covalent view of a chemical bond is assigned to the atoms in a molecule assuming that all chemical bond electrons are equally shared between atoms, regardless of their relative electronegativities. is the virtual charge that Simply put, the formal charge is the difference between the number of valence electrons of an atom in the neutral free state and the number assigned to that atom in the Lewis structure. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.

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d. Despite the fact that kf and kr will continue to be unequal, rates will become equal due to concentration changes.

When the forwards rate (kf[A]) equals equal reverse rate (kr[B]), the system has reached equilibrium and the concentrations of the reactant and product have stopped changing.

Chemical kinetics governs all chemical reactions, whether they are reversible or not.So, by applying the idea of chemical kinetics, we may better grasp the equilibrium constant K.As illustrated below, let kr be the rate of the reverse reaction and kf be the rate of the forward reaction.

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Chlorine atoms are released when CFCs, which are composed of chlorine, fluorine, and carbon, degrade over time as a result of exposure to UV radiation, and these atoms interact with the ozone molecule to destroy it.

Because they contain hydrogen, HCFCs degrade in the atmosphere more quickly than CFCs do. As a result, HCFCs have less potential to cause global warming as well as ozone depletion. Because they don't contain chlorine, HFCs don't help destroy stratospheric ozone.

All new products don't contain CFCs, which were completely phased out of production in 1995. Your local air conditioning expert can replace very old air conditioners with more modern, environmentally friendly models if they still contain CFCs.

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Question-"A class of widely used chemical coolants known as hydrofluorocarbons (HFCs) have been adopted as replacements for chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) in refrigerators and air conditioners. Based on the results of a NASA-derived atmospheric chemistry climateâ model, HFCs cause all except which of the following?"

Answer:

3.2877204

Explanation:

Answer: The use of inclusive language is an important way to reflect the diverse nature of a given society. Non-discriminatory language avoids false assumptions about people and helps to promote respectful relationships. A commitment to inclusive language is an important attribute of a modern, diverse and inclusive society.

Explanation:

According to the collision theory, temperature, strain of gaseous reactants, and the attention of the reactants have an effect on the range of collisions and the range of powerful collision over the time.

These elements are the character of the reactants, attention, floor area, temperature and catalysts. Each of those elements will increase response charge due to the fact they boom the range or strength of collisions.There are 5 widespread residences that could have an effect on the charge of a response:The attention of the reactants.

The greater focused the quicker the charge. Temperature. Physical kingdom of reactants. The presence (and attention/bodily form) of a catalyst (or inhibitor).

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The percent composition of a given element in a compound is the number of molar mass in one mole of that compound.

The percentage of each element in a compound measured by mass is known as the composition. A compound's chemical formula can also be used to estimate its % makeup. To start, the formula's subscripts are employed to determine how much of each element there is in a mole of the compound.

Percentage Composition. Find the molar mass in grams per mole of each component in the compound. Find the compound's total molecular weight. Divide the total molecular mass by the molar mass of the component. Your new number will range from 0 to 1. To obtain the percent composition, multiply it by 100%.

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The final volume will be larger than 1.12L.

What is ideal gas equation?

The Ideal Gas Law is an equation of state for a gas and is also known as the equation of state of an ideal gas. It states that the product of the pressure, volume, and temperature of an ideal gas is a constant. Mathematically, the Ideal Gas Law can be written as PV = nRT, where P is pressure, V is volume, n is the number of moles of the gas, R is the ideal gas constant, and T is temperature. The constant R is equal to the gas constant, 8.314 J/mol-K, divided by the molar mass of the gas. The Ideal Gas Law is an approximation of the behavior of many gases under many different conditions. It is useful because it relates the variables of pressure, volume, and temperature in a simple mathematical relationship.

PV=nRT

Using ideal gas equation

V2= P1V1/T1 ×T2/P2

In this equation P2 is in denominator so when pressure is decreased V2 increases.

T2 is in numerator so when temperature increases V2 increases.
Overall V2 increases.

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The final gas volume will increase

Define the ideal gas law.

The ideal gas law, also known as the perfect gas law, is a relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures where the gas's molecules move virtually independently of one another.

The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).

PV = nRT

P1V1/T1 = P2V2/T2

From tis .pressure is directly proportional to volume

So if pressure is decreased, volume also decreases

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If the reaction producing KCl from its elements goes essentially to completion, it is likely that the reaction is thermodynamically favorable. This means that the reaction will proceed spontaneously and release energy as it occurs.

Thermodynamic favorability is determined by the change in the enthalpy (heat) and the change in the entropy (disorder) of the system. If the change in enthalpy is negative (exothermic) and the change in entropy is positive (increase in disorder), the reaction is likely to be thermodynamically favorable.

In general, reactions that are thermodynamically favorable are more likely to occur spontaneously and go to completion, while reactions that are thermodynamically unfavorable are less likely to occur spontaneously and may not go to completion. However, other factors, such as the presence of catalysts or the rate at which the reaction occurs, can also affect the likelihood of a reaction occurring.

If the reaction producing KCl from its elements goes essentially to completion, it is likely that the reaction is thermodynamically favorable. This means that the reaction will proceed spontaneously and release energy as it occurs.

Thermodynamic favorability is determined by the change in the enthalpy (heat) and the change in the entropy (disorder) of the system. If the change in enthalpy is negative (exothermic) and the change in entropy is positive (increase in disorder), the reaction is likely to be thermodynamically favorable.

In general, reactions that are thermodynamically favorable are more likely to occur spontaneously and go to completion, while reactions that are thermodynamically unfavorable are less likely to occur spontaneously and may not go to completion. However, other factors, such as the presence of catalysts or the rate at which the reaction occurs, can also affect the likelihood of a reaction occurring.

Butane's experimental molar mass is 0.23 g/0.0040 moles, or 58 g/mole.13. The molecular formula for butane is C4H10.Calculate its molar mass.58.1 g/mole

We may determine the atomic weights of the elements using their periodic tables, and we discover the hydrogen has had an atomic mass of 1, while that of oxygen is 16.We sum the contributions out of each atom to determine the molecular weight with one water molecule, which is 2(1) + 1(16) = 18 grams/mole.

The ratio of a average mass with one molecule of the a compound or element to one-twelfth the mass of an atom or carbon-12 is known as the relative molecular mass.Ar has a mass number that is the same as its numerical value.

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Based on Figure 1, the following statement best predicts the effect that a change from a moderately acidic environment ( pH near 6) to a basic environment will have on peroxidase activity:

Peroxidase activity will decrease.

Peroxidases are the most common enzyme and are thought to exist in every living genus. They produce reactive oxygen species and catalyse peroxide reduction. In the current study, we showed that insect infestation causes peroxidase activity in sap and total soluble protein of plant leaves.

For this study, three significant crop plants—cotton, cowpea, and the tomato—were used. Peroxidase activity in the sap and TSP of all the studied plants increased by 1.6 to 3.14 times after chewing insect infestation.

Similar findings were made when sap-sucking insects were fed, increasing the peroxidase activity of the sap and TSP by 1.8 to 2.53 fold. In-gel peroxidase assay confirmed the increased peroxidase activity.

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Taking into account the definition of kinetic energy, the object moving with a speed of 24 m/s and a kinetic energy of 356 J has a mass of 1.236 kg.

Kinetic energy is defined as the energy associated with bodies that are in motion.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

Where:

In this case, you know:

Replacing in the definition of kinetic energy:

356 J = 1/2× m× (24 m/s)²

Solving:

356 J÷ [1/2× (24 m/s)²]= m

1.236 kg= m

Finally, the mass of the object is 1.236 kg.

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A reactant or product being added to or removed Variations in the container's volume Addition of an inert gas

Dangerous gas emissions are also coming from the planet's surface. Human activity has caused the atmosphere's quantities of carbon dioxide, methane, tropospheric ozone, and nitrous oxide to rise dramatically above pre-industrial levels.

The plural version of the word "gas" is "gase," and it refers to a substance that expands to fill any container. Many distinct meanings can be assigned to third-person present tense verbs, such as "gasses."

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The different types of atomic spectrometers are emission spectrometer, absorption spectrometer and continuous spectrometer which give emission spectrum, absorption and continuous spectrum respectively.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.

Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.

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The right order of processes for converting pyruvate to acetyl-CoA is by the decarboxylation of pyruvate by thiamine pyrophosphate to produce hydroxyethyl-TPP.

Given that no heat is introduced when edibles, tinctures, or other consumable products are made, decarboxylation one of the most crucial processes. Tetrahydrocannabinol (THC) and cannabidiol, two of the plant's most important cannabinoids, are activated by decarbing (CBD).

To get high from any cannabis product, decarboxylation must occur. The decarboxylation procedure is still required in order to activate the marijuana in the edible before intake even if eating edibles doesn't include heat like smoking a joint or using a vape pen.

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The moles of [tex]O_{2}[/tex] present in an infant's lungs, if the infant takes a full breath of air is [tex]1.46*10^{-4}[/tex] moles

We can calculate the moles in the following way

We have been given the following data,

The infant takes a full breath of air

Full breath of air= volume of lungs of the infant= 17 mL= [tex]\frac{17}{1000}[/tex] L

Pressure inside lungs(P)= 101.3* [tex]10^{3}[/tex] Pa= 1 atm

Temperature(T)= Room temperature= 298 K

Volume of Oxygen(V)= 21% of total volume of lungs= 21% of 17 mL

= [tex]\frac{21*17}{100}[/tex] mL

= 3.57 mL

= [tex]\frac{3.57}{1000}[/tex] L

Now, let the number of moles of oxygen the infant breathes be n.

Since PV=nRT

Therefore, n= [tex]\frac{PV}{RT}[/tex]

We know that the value of R is 0.082 L atm/K mol

n = [tex]\frac{(1* 3.57)}{(0.082*298*1000)}[/tex] moles of oxygen

=  [tex]1.46*10^{-4}[/tex] moles of oxygen

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The chlorine and sodium atoms in this configuration form a crystal lattice, a crystal structure made up of powerful ionic bonds.

The symmetrical, three-dimensional structural configuration of points representing atoms, ions, or molecules that make up a crystalline solid is known as the crystal lattice.

It can be characterized as the spatial geometrical arrangement of the atoms, ions, or molecules that make up the crystalline solid.

The cubic lattice of rock salt, NaCl, which has half of its lattice points occupied by sodium atoms and half by chlorine atoms, is one of the most prevalent structures.

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By counting the atoms on each side, the right order for solving the equation will be 3, 4, 2, and 1. Decide which atoms are on each side, make sure there are an equal number of each sort of atom on each side, and then utilize coefficients to add more atoms to each side.

The number of atoms involved in the reactants and products sides of the chemical equation must match for the equation to be considered balanced.

In this particular chemical process, for instance, nitrogen (N2) and hydrogen (H) combine to create ammonia (NH3). Nitrogen and hydrogen are the reactants, and ammonia is the end result.

Chemical reactions must be in balance in order to adhere to the law of conservation of mass, which stipulates that mass cannot be created or destroyed.

the proper method for calculating the number of atoms on either side of the equation. Make a list of the atoms on each side.

Check to make sure that each side has the same number of each sort of atom, and then use coefficients to add more atoms to each side.

As a result, 3, 4, 2, and 1 are the proper order.

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Answer:

3.51 x 10²¹ molecules H₂O

Explanation:

To find the amount of molecules in the sample, you need to multiply the amount of moles by Avogadro's Number. Avogadro's Number is a ratio comparing the amount of molecules per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 3 sig figs like the given value (0.00583 = 3 sig figs).

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

0.00583 moles H₂O           6.022 x 10²³ molecules
--------------------------------  x  --------------------------------------  =  3.51 x 10²¹ molecules
                                                          1 mole