The volume of a sample of hydrogen is 798 mL and it exerts 621 mm Hg pressure at 5.00°C. What volume does it occupy at standard temperature and pressure?

Answer:

a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +.

Explanation:

In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. Both reactions occur because in different regions of the Chart of the Nuclides, one or the other will move the product closer to the region of stability. These particular reactions take place because conservation laws are obeyed. Electric charge conservation requires that if an electrically neutral neutron becomes a positively charged proton, an electrically negative particle (in this case, an electron) must also be produced. Similarly, conservation of lepton number requires that if a neutron (lepton number = 0) decays into a proton (lepton number = 0) and an electron (lepton number = 1), a particle with a lepton number of -1 (in this case an antineutrino) must also be produced. The leptons emitted in beta decay did not exist in the nucleus before the decay–they are created at the instant of the decay.

The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

For (1),

The longest straight chain have 7 carbon compound and having single bond, suffix of this compound is Heptane. Now there are three functional group of methyl there for prefix is trimethyl. Overall the name of compound is 3,4,5-trimethylheptane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are four functional group of methyl there for prefix is tetramethyl. Overall the name of compound is 2,2,3,3-tetramethylpentane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are three functional group of methyl and ethyl so they write according to alphabetic order. Overall the name of compound is 2,2- dimethyl-3-ethylpentane.

Thus, we concluded that the The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

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Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections.

Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections. The constituent monosaccharides can form each glycosidic bond between any hydroxyl group, just like the disaccharides can.

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The balanced equation for ammonia formation is:

N2 + 3H2 ---> 2NH3

First we need to figure out how many moles of hydrogen, 340 grams nets us. We can do this by dividing 340 by the molar mass of diatomic hydrogen (2.016 grams/mole). This will get us 168.651 moles.

From the chemical formula, we see that it takes 3 moles of hydrogen to produce 2 moles of ammonia. So, if we multiply the moles of hydrogen by (2/3), we can find the moles of ammonia produced.

168.651 x (2/3) = 112.43 moles of ammonia

To convert this into grams, we multiply this number with the molar mass of ammonia (which is 17.031 grams/mole)

112.43 x 17.031 = 1914.8 grams of ammonia. Or if you want to account for significant figures, 1900 grams of ammonia.

The reaction rate constant and activation energy are connected through the Arrhenius equation. By using the logarithmic form of that equation, we can calculate the activation energy of 0.2045 kJ/mol.

According to Arrhenius equation, activation energy and rate constant are connected in the following way:

[tex]k = Ae^{\frac{-E_{a} }{RT} }[/tex]

Ea is the activation energy, k is the rate constant, R is the universal gas constant (8.314 J/Kmol) and T is absolute temperature (in Kelvins). This expression can be transformed so that it is easier to determine Ea:

[tex]lnk = \frac{-Ea}{R}*\frac{1}{T}[/tex]

When lnk is plotted as a function of 1/T, the slope coefficient is equal to -Ea/R. This means that:

-24.6 K = -Ea/R ⇒ Ea = 24.6 K * R = 24.6 K * 8.314 J/Kmol = 204.5 J/mol = 0.2045 kJ/mol

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Answer:

t can be removed by using a water softener

Explanation:

If Andrea's teacher wrote a note on her lab report stating that though her data was precise, it was not accurate, then Andrea she didn't properly calibrate her instruments (Option b).

The term precision indicated that the measurement was correctly recorded in the experimental procedure, while accuracy refers to this measurement is factually correct. For example, when measuring temperature, it may be deviated from the correct temperature value due to failure of calibration in instrumentation.

Therefore, we can conclude that precision and accuracy are not identical and we can take precise measurements that are not accurate.

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A metric prefix is a unit prefix used to denote a multiple or submultiple of a basic unit of measure. Today's metric prefixes are all decadic. Each prefix has its own distinctive sign, which is added before any unit symbol.

Since humans have been measuring things for thousands of years, the units we use to represent those measurements have changed. Numerous units are now available to describe physical amounts.

Longitude, for instance, can be expressed in terms of the foot, metre, fathom, chain, parsec, league, and so on.

In the SI, multiples and subdivisions of any unit can be designated by combining the prefixes deka, hecto, and kilo, which represent 10, 100, and 1000 respectively, and deci, centi, and milli, which represent correspondingly, with the name of the unit.

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No because it's travelling at a constant velocity in both scenarios and there's no particular direction in which the rate of change of velocity is changing.

By using the general gas equation, the mass of Xenon in the mixture is found to be 27.44g.

The ideal gas law, also known as the general gas equation, says that the product of the pressure and volume of one gram of an ideal gas is equal to the result of the universal gas constant and the absolute temperature of the gas.

PV = nRT denotes the general gas equation. In this equation, the letters P, V, n, R, T stand for the pressure of the ideal gas, the volume of the ideal gas, the total amount of the ideal gas given in moles, the universal gas constant and the temperature, respectively.

The general gas equation states that one mole of an ideal gas may occupy a volume of 22.414 liters under standard circumstances, which are a pressure of 101,325 Pa / 1atm and a temperature of 273.15 K or 0°C.

Given:

Pressure, P = 2.44atm

Temperature, T = 86+273 = 359K

Volume, V = 7.66L

To find:

Mass of Xe = ?

Formula:

PV = nRT

Calculations:

Let total no. of moles of Ar and Xe = y

n = PV/RT

n = 2.44 x 7.66 / (0.0821 x 359) = 0.634mol

No. of moles of Argon (yAr) = 17/40 = 0.425mol

y = yAr + yXe

0.634 = 0.425 + yXe

yXe = 0.634 - 0.425

yXe = 0.209mol

Mass of Xe = no. of moles x gram atomic mass

Mass of Xe = 0.209 x 131.293 = 27.44g

Result:

27.44g Xenon is present in the given Argon and Xenon mixture.

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Evidence might you need in order to explain the bands of different colors are because of electromagnetic radiations

The color of the light that correspond to the narrow wavelength band are the pure spectral colors

Here each different wavelength and frequency of visible light correspond to the different color so that spectrum appear as a band of color ranging from violet at the shorter wavelength and full spectrum of visible light travel through prism and wavelength separates into the colors of the rainbows because each colors has its own frequency and different wavelength and spectrophotometer is the important tool to study the colors of band

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Depending on the extraction you are performing and the way it was washed, the separatory funnel can either be dried, washed again, or just used as is.

In an ideal case, the separatory funnel was thoroughly washed and rinsed with deionized water. Because most liquid-liquid extractions include an aqueous layer, the small amount of water already present in the funnel will not have any negative impact on the results of your experiment, and the funnel can be used as it is.

If you are not sure whether the funnel was properly washed, you can quickly wash it yourself using detergent and water, rinse it thoroughly with deionized water, and then use it.

Finally, you can rinse the funnel with some ethanol (or, if possible, acetone), which will pick up water and wash away any organic impurities that might be present, and then dry it with a hair dryer. Be careful to wait for the funnel to cool after drying because many organic solvents have low boiling points and might cause a problem if poured into a hot funnel.

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The presence of water on the surface of the plastic sample will be indicated with a broad peak in the 2400 – 3200 [tex]cm^{-1}[/tex] range of Infra-red (IR) spectroscopy.

The term "infra-red (IR) spectroscopy" refers to a method for locating the functional groups that are present in a molecule. The electromagnetic spectrum's infrared area is located between the microwave and the visible spectrum. The typical Infra-red (IR) absorption range is 600-4000 [tex]cm^{-1}[/tex]. The IR spectra of substances that absorb in the IR range exhibits peaks. A molecule that is IR active is water. In the Infra-red region, it absorbs. Water is thus not used as a solvent in IR spectroscopy. Therefore, it is necessary that water existing on the surface of the samples be removed during cleaning before their IR is recorded. However, if cleaning does not get rid of the water that is on the surface, an expansive peak in the IR spectra will show up between 2500 and 3200 [tex]cm^{-1}[/tex].

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The value of a car that was purchased in 2010 for $20,000 which is depreciating in value by 15% each year is $3937.49.

The value of the car will be found using the exponential decay model.

The formula of the exponential decay model is given as follows:

y = a (1 - r)ˣ

where;

y = the amount remaining

a = initial amount

r = decay rate

x = time period of decay

In the question above, a car was bought for $20000 in 2010.

The value of the car decays exponentially at a rate of 15% each year.

The time period between 2010 and 2020 is 10 years.

Considering the data given about the car:

a = $20000

r = 15% or 0.15

x = 10

Substituting the values in the decay formula:

y = 20000 (1 - 0.15)¹⁰

y = 20000 (0.85)¹⁰

y = $3937.49

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The subscripts in a chemical equation shows the number of atoms of each element in a compound.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

Chemical equations involves molecular formulas of compounds that make up the reactant and products. The molecular formula is a notation indicating the number of atoms of each element present in a compound.

Subscript is a type of lettering form written lower than the things around it. The subscript shows the number of atoms of an element in a compound.

Examples of elements with evident subscripts are as follows:

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The pH established of the equilibrum is 7.

What is equilibrium?

equilibruim is a state in which opposing forces of influence are balanced.

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Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .

Lithium , chemical symbol Li is the alkali group metal. lithium is the lightest solid element. lithium has melting point of 180.54 °C and having boiling point of 1342 °C. lithium belongs to group I(a) having valency 1. under normal condition , lithium is the least dense solid element having density 0.56 g/cm³ . lithium has several industrial uses like heat resistant glass lithium ion batteries , lithium is so light ,it can float on water.

Thus, Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .

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Answer:

Acceleration

Explanation:

However, if it is heated to impregnated vapor, volume and work (1W2) will determine the final temperature. result (a) Indicate that the lift pressure should be 400 kPa, using v = V/ m = 0.1 m3/kg

Standard sets of circumstances for experimental measures to be produced at standard temperatures and pressures (STP) enable comparisons to be made between various sets of data. The most commonly used standards are those of the National Institute of Standards and Technology (NIST) and the International Union of Pure and Applied Chemistry (IUPAC), albeit these standards are not generally acknowledged. Different essential delineations for other associations' standard reference circumstances have been established.

In chemistry, IUPAC changed its description of standard temperature and pressure in 1982

Temperature and Pressure

Until 1982, STP was defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 1 atm(101.325 kPa).

Since 1982, STP has been defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 105 Pa( 100 kPa, 1 bar).

STP shouldn't be confused with the standard state generally used in thermodynamic evaluations of the Gibbs energy of a response.

NIST uses a temperature of 20 °C(293.15 K, 68 °F) and an absolute pressure of 1 atm(14.696 psi,101.325 kPa). This standard is also called normal temperature and pressure( shortened as NTP). still, a common temperature and pressure in use by NIST for thermodynamic trials is298.15 K( 25 °C, 77 °F) and 1 bar(14.5038 psi, 100 kPa). NIST also uses" 15 °C( 60 °F)" for the temperature compensation of refined petroleum products, despite noting that these two values aren't exactly harmonious with each other.

The International Standard Metric Conditions for natural gas and analogous fluids are288.15 K(15.00 °C;59.0.

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Answer:

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, according to AccuWeather. What qualifies as a heat wave can vary greatly from region to region.

Answer:

it's false the correct answer will be There are more red blood cells than white blood cells in the blood

It eats food to get energy is NOT a necessary characteristic of a living thing

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A sphere surrounds the atomic nucleus called the s orbital. There are shells within the sphere where an electron is more likely to be discovered right now. 1s is the smallest sphere. Greater than the 1s orbital are the 2s and 3s orbitals.

Each p orbital has two lobes, that are located on either side of the plane of the nucleus. The three p orbitals are equal in terms of size, shape, and energy, but they differ in how the lobes are orientated. These three orbitals are referred to as 2px, 2py, and 2pz because the lobes are located along one of the x, y, or z-axis. Similar to s orbitals, p orbitals grow in size and energy as the primary quantum number rises (4p > 3p > 2p).

sp3 orbital: One of a group of hybrid orbitals that result from mathematically combining one s orbital and three p orbitals to create four new equivalent orbitals that are directed toward the corners of a regular tetrahedron.

One of the hybrid orbitals created when one s orbital and one p orbital are mathematically merged to create two new equivalent, perpendicular orbitals is the sp orbital. With the exception of being closer to the nucleus, sp orbitals resemble p orbitals in appearance.

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A material with density 2.7 g/ml and volume 35.6 ml would have a mass of 96.12 g

Given that,

Density (D) = 2.7 g/ml

Volume (V) = 35.6 ml

We need to find the mass (m) of the material

We know that,

D = m / V

D = Density

m = Mass

V = Volume

Substituting,

2.7 = m / 35.6

m = 2.7 * 35.6

m = 96.12 g

Thus, mass of the material is 96.12 g

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Sodium (Na) and potassium (K) in the same group on the periodic table because of option B They have similar reactivity.

The periodic table, also called the periodic table of the factors, is a tabular show of the chemical elements. it is broadly used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.

Lithium, sodium, and potassium have the same wide variety of valence electrons i.e. 1, for this reason, they belong to the same organization. The institution is referred to as the alkali metals group because these kinds of elements shape oxides that dissolve in water to form alkali.

Potassium is observed clearly in lots of meals and as a complement. Its major position within the body is to assist maintain ordinary levels of fluid inside our cells. Sodium, its counterpart, keeps regular fluid ranges outdoors of cells. Potassium also helps muscles to settle and supports normal blood pressure.

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The reaction rate with mass of the tablet being 1000 mg and volume of water 0.200 L is

(i) If Reaction time is 34.5 sec – 145 mg / L / sec is the reaction rate

(ii) If Reaction time is 28.9 sec – 173 mg / L / sec is the reaction rate

(iii) If Reaction time is 23.1 sec – 216 mg / L / sec is the reaction rate

Given that, Mass of tablet = 1000 mg

                  Volume of water = 0.200 L

We need to find the reaction rate

We know that, Reaction rate =  [tex]\frac{mass of tablet / volume of water}{reaction time}[/tex]

(i) Reaction rate if reaction time is 34.5 sec = [tex]\frac{1000 / 0.200}{34.5}[/tex] = 145 mg / L / sec

(ii) Reaction rate if reaction time is 28.9 sec = [tex]\frac{1000/0.200}{28.9}[/tex] = 173 mg / L / sec

(iii) Reaction rate if reaction time is 23.1 sec = [tex]\frac{1000/0.200}{23.1}[/tex] = 216 mg / L / sec

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After ingesting 1 L of 80-proof whiskey, the student's consumption of ethanol would, after the application of dimensional analysis, be 5.798 g of ethanol per kilogram of the body.

First, we calculate the mass of ethanol ingested by the student by using dimensional analysis. To do that, we must calculate its volume, which we can do using the total volume (1 L = 1000 mL) and alcohol volume percentage (40% = 0.40). When we have the volume in hand, we can calculate the mass of ethanol using its density (0.789 g/cm³ = 0.789 g/mL).

m(EtOH) = V(EtOH) * d(EtOH) = 0.40 * V(total) * d(EtOH) = 0.40 * 1000 mL * 0.789 g/mL = 315.6 g

So the student would ingest 315.6 g of ethanol. We can now divide that mass by the student's mass to calculate their consumption.

1 lb = 453.59 g = 0.45359 kg

315.6 g / (120.0 * 0.45359 kg) = 5.798 g/kg

This is dangerously close to the median lethal dose and definitely above the lower threshold of 5 g/kg, so the student would definitely be in danger of overdosing.

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The change will correctly effect the model of the electron transport system above simply is to switch H₂O and O₂ ( Water and oxygen ).

The correct answer choice is option c.

It happens that oxygen react with 2 different electrons from the transport chain and 2 hydrogen in order to produce water molecules in the process.

Electron transport chain simply refers to a protein complex redox reactions which result in the production of ATP molecules. In this whole process of forming ATP, the electrons in the chain carried by the NADH, FADH2 and H+· are transferred to oxygen atom.

In conclusion, for an effective change to occur in the above electron transport system, there needs to be a switch of water and oxygen molecules

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Answer :Switch H2O and O2.

Explanation: edgenuie 2022-23