Which of these processes is a chemical change?

Answer:

A

Explanation:

Answer:

UV or Gamma Rays

Explanation:

X-rays: 10^-10

UV: 10^-8

Gamma Rays: 10^-12

Answer:

\(P=361.2torr\)

Explanation:

Hello,

In this case, considering that the formed liquid is solution is ideal, we can relate the vapor pressure and molar fraction of water with the total vapor pressure of the solution by using the Dalton's equilibrium-based law:

\(P=x_{H_2O}P_{H_2O}^v\)

In such a way, we compute the molar fraction of water by computing its moles as well as diglyme:

\(n_{H_2O}=100mL*\frac{1g}{1mL} *\frac{1mol}{18g} =5.56molH_2O\\\\n_{C_6H_{14}O_3}=150g*\frac{1mol}{134g}=1.12molC_6H_{14}O_3\)

Thus, the mole fraction of water:

\(x_{H_2O}=\frac{5.56mol}{5.56mol+1.12mol}=0.832\)

Thereby, the vapor pressure of the solution:

\(P=0.832*434torr\\\\P=361.2torr\)

Regards.

The vapor pressure of the pure water with diglyme has been 361.28 torrs.

Vapor pressure of a solution can be given by :

Vapor pressure = Mole fraction of solvent \(\times\) Vapor pressure of the pure solvent

The pure solvent has been pure water.

The vapor pressure of pure water = 434 torr.

The mole fraction of the solvent can be given as:

Mole fraction of solvent = \(\rm \dfrac{Moles\;of\;solvent}{Moles\;of\;solution}\)

The solvent has been water. The density of water has been 1g/ml. It states that the mass of the 1 ml sample is 1 gram.

Mass of 100 ml water sample = 100 grams

Moles can be expressed as:

Moles = \(\rm \dfrac{weight}{molecular\;weight}\)

Moles of solvent (water) = \(\rm \dfrac{100}{18}\)

Moles of solvent (water) = 5.55 mol.

The moles of solute (Diglyme) can be given as:

Moles of solute (Diglyme) = \(\rm \dfrac{150}{134.17}\)

Moles of solute (Diglyme) = 1.117 mol.

The moles of solution = Solvent + solute

The moles of solution = 5.55 + 1.117 mol

The moles of solution = 6.667 mol.

The mole fraction of the solvent has been;

Mole fraction of solvent = \(\rm \dfrac{5.55}{6.667}\)

Mole fraction of solvent = 0.832

The vapor pressure of the solution will be:

Vapor pressure = 0.832 \(\times\) 434 torr

The vapor pressure of the solution = 361.28 torrs.

The vapor pressure of the pure water with diglyme has been 361.28 torrs.

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

It's True.

Explanation:

Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object). There are four states of matter, solid, liquid, gas, and plasma.

Answer:

it would be 1

Explanation:

The activation energy of this reaction is approximately -13.770 J/mol.

1. To graphically determine the activation energy, we need to plot two points. The given data points are:

  Point 1: (1, -1.275)

  Point 2: (2, 0.379725)

2. The rise is the change in the y-coordinate between the two points:

  Rise = y2 - y1 = 0.379725 - (-1.275) = 1.654725

3. The run is the change in the x-coordinate between the two points:

  Run = x2 - x1 = 2 - 1 = 1

4. The slope of the line formed by these two points can be calculated using the formula:

  Slope = rise / run = 1.654725 / 1 = 1.654725

5. The activation energy (Ea) can be determined using the equation:

  Ea = -R * slope

 Here, R is the ideal gas constant, which is approximately 8.314 J/(mol·K).

6. Plugging in the values:

  Ea = -8.314 * 1.654725 = -13.770 J/mol

Note that the activation energy is negative because it represents the energy difference between the reactants and the transition state (higher energy) in an exothermic reaction.

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Answer:

valence electrons, thereby "negating" some of the attractive force from the positive nucleus. Electrons really close to the atom (n-2 or lower) pretty much just look like protons, so they completely negate. As electrons get closer to the electron of interest, some more complex interactions happen that reduce this shielding.

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

Explanation:

hope this was helpful

Answer:

the most useful hydrocarbon is fuel.

Explanation:

some examples like: natural gases,coal,diesel fuel, kerosene etc.

The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.

The term hydrocarbon is defined as the compound which is made up of hydrogen and carbon. They are useful as energy sources. Hydrocarbons are examples of group 14 hydrides.

There are four types of hydrocarbon that are alkanes, alkenes, alkynes and aromatic hydrocarbons.

Among the most widely used hydrocarbon fuels include gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane. Plastics and synthetic fabrics like polyester are made using hydrocarbons as well.

Thus, The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.

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Answer:

It is a beta decay equation unknown

Explanation:

none

Answer:

True

Explanation:

The partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

To calculate the partial pressures of \(H_2\)and \(N_2\)in the 10dmcube container, we need to use the ideal gas law equation, which states that the pressure of a gas is directly proportional to its number of moles and temperature, and inversely proportional to its volume.

First, we need to calculate the number of moles for each gas. Since we are given the volume of each gas and the volume of the container, we can use the formula:

Number of moles = Volume / Molar volume

The molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At standard temperature and pressure (STP), the molar volume is 22.4 L/mol.

For \(N_2\), the number of moles is 2 dmcube / 22.4 L/mol = 0.089 mol
For \(H_2\), the number of moles is 5 dmcube / 22.4 L/mol = 0.223 mol

Next, we can calculate the partial pressures of each gas using the formula:

Partial pressure = (Number of moles / Total number of moles) * Total pressure

The total pressure is the sum of the pressures of each gas:

Total pressure = Pressure of N2 + Pressure of \(H_2\)

Given that the pressure of N2 is 100 kPa and the pressure of \(H_2\)is 500 kPa, we have:

Total pressure = 100 kPa + 500 kPa = 600 kPa

Now we can calculate the partial pressure of \(N_2\):

Partial pressure of \(N_2\)= (0.089 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 165.6 kPa

Similarly, we can calculate the partial pressure of \(H_2\):

Partial pressure of H2 = (0.223 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 434.4 kPa

Therefore, the partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

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Answer:

C) prevent toxic gases from spreading through the lab

Explanation:

Fumes hoods are used to prevent toxic gases from spreading through the lab. The correct option is c.

Fumes hoods are artificial construction in laboratories and industries. They are designed to keep or absorb hazardous gas and vapors coming out from chemical processes and cooking.

Fumes hood limit exposure to gases and hazardous chemicals. They are rectangles with five sides. They are of both types, ducted or ductless. Both have the same principle. It absorbed the harmful gas and expelled it outside.

They ate protection for the users and scientists working in the laboratories and industries. An exhaust fan also has an exhaust fan that attracts the vapor and chemicals towards itself.

Thus, the correct option is c. prevent toxic gases from spreading through the lab.

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Explanation:

By Factor Theorem,

(2)^m - 3(2)^(m-1) + 4(2) - 4 = 0.

=> 2^m - 1.5 * 2^m + 4 = 0

=> 4 - 0.5 * 2^m = 0

=> 0.5 * 2^m = 4

=> 2^m = 8

=> m = 3.

Hence the value of m is 3.

Answer:

D

Explanation:

Protons have pretty much nothing to do with reactions, but electrons affect reactions because that is how elements bond. A neutral sodium atom has 11 electrons while a neutral neon atom has 10 electrons, meaning D is correct.

Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

Silver is a shiny metal that conducts electricity very well. It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.

Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness and when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boiling points.

Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6. The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .

Therefore,Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

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Answer:

y = 2x pv = 13 z = (2/x) 4 = (y/x) h = (9g/5) Inverse variation is represented by the equation y = k/x, where k is a constant.

Answer:

Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄

The coefficients are: 1, 3, 3, 1

Explanation:

_Na₃PO₄ + __HCl —> __NaCl + _H₃PO₄

The above equation can be balance as follow:

Na₃PO₄ + HCl —> NaCl + H₃PO₄

There are 3 atoms of Na on the left side and 1 atom on the right side. It can be balance by writing 3 before NaCl as shown below:

Na₃PO₄ + HCl —> 3NaCl + H₃PO₄

There are 3 atoms of Cl on the right side and 1 atom on the left side. It can be balance by writing 3 before HCl as shown below:

Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄

Now, the equation is balanced.

The coefficients are: 1, 3, 3, 1

The energy in joules of one mole of photons of visible light having a wavelength of 4.11×10^2 nm? can be expressed as 2.9*10^5 J

From the question we were told to find the energy and the parameters that is needed to calculate these are;

c=3*10^8

h= 6.626 * 10^-34 J.s

1 mol photons = 6.023x10^23 photon

λ = 4.11×10^2 nm  = 4.11 × 10-7 meters

The parameters can be input  as Energy of one mole photon (E) = ( 6.023x10^23 * 6.626 * 10^-34 * 3*10^8)/ (4.11 × 10^-7)

=291302

=2.9*10^5 J

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The molecular formula for tripeptide Gly-Gly-His is C10H15N5O4. The structure is attached below in the picture. It has a role as a metabolite.

A tripeptide is created by combining three amino acids, and it is then joined by two or even three peptide bonds. The order of the individual amino acids that make up a peptide dictates how it functions, just like with proteins. The simplest tripeptide is glycine. The most significant tripeptide, according to scientific studies, is glutathione (-L-Glutamyl-L-cysteinylglycine), which has a number of functions in a wide range of life forms.

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The balanced equation will be \(2NH_3 + 3I_2 -- > N_2I_6 + 3H_2\)

They are chemical equations that obey the law of conservation of atoms.

In other words, they are equations in which the number of atoms before and after reactions are the same.

Thus, the balanced equation for the reaction will be \(2NH_3 + 3I_2 -- > N_2I_6 + 3H_2\)

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In general, the ionizing power increases while the penetration power decreases as mass increases. Alpha particles have the highest mass when merely comparing the three most prevalent forms of ionizing radiation.

The mass of an alpha particle is around 8,000 times more than that of a beta particle and is roughly four times that of a proton or neutron. The alpha particle has the strongest ionizing strength and the greatest capacity to harm tissue because of its huge mass. However, because of their size, alpha particles are less able to penetrate solid objects.

Although beta particles have significantly more penetrating capability due to their smaller size than alpha particles, they have far less ionizing power (less capacity to harm tissue).

Gamma rays are a high energy kind of electromagnetic radiation rather than particles (like x-rays, except more powerful). Energy that has neither mass nor charge are gamma rays. Gamma rays can penetrate many inches of thick material (like lead) and are therefore shielded by doing so. A human body may allow gamma rays to pass through completely without interacting with anything.

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Answer:

Explanation:

The molar mass (MM) of Ca₃(PO₄)₂ can be calculated as follows:

Now we can convert 934.32 g of Ca₃(PO₄)₂ into moles:

Answer:

A. Sugar

Explanation:

Sugar dissolves in water because of its molecular structure (C6H12O6), as the sugar is put in the water, energy is released and the polarity of the water breaks apart the molecules. However, the molecules can be obtained back by evaporating the water.

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

The water

Explanation:

Answer:

the awnser is 22

Explanation:

9+6 = 15 + 7 = 22 have a great day

Answer:

22

Explanation:

2 + 5 + 6 + 9 = 22

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Mescaline produces a wide range of psychoactive effects when ingested, including altered perception of reality, hallucinations, and euphoria. It is a powerful psychedelic drug that has been used for centuries by Native American tribes in spiritual ceremonies

Mescaline is a hallucinogenic alkaloid that is derived from the Peyote cactus. Mescaline is a complex organic molecule that can be synthesized in the laboratory from 3,4,5-trimethoxybenzyl bromide in two steps.The first step involves nucleophilic substitution using sodium cyanide, and the second step is a reduction using lithium aluminum hydride (LAH).Here's how mescaline can be synthesized from 3,4,5-trimethoxybenzyl bromide:Step 1: Nucleophilic substitution using sodium cyanideThe reaction of 3,4,5-trimethoxybenzyl bromide with sodium cyanide results in the formation of the nitrile derivative. NaCN serves as the nucleophile in this reaction, and it replaces the bromide ion.The mechanism for this reaction involves the following steps: A nucleophilic attack by the cyanide ion on the benzyl bromide. The carbon-bromine bond breaks, and the benzyl cation is formed. A second nucleophilic attack by the cyanide ion occurs on the benzyl cation, resulting in the formation of the nitrile derivative.Here's the reaction equation for this step:Step 2: Reduction using lithium aluminum hydrideThe next step is the reduction of the nitrile derivative using LAH. LAH serves as a strong reducing agent in this reaction and reduces the nitrile derivative to the amine. The mechanism for this reaction involves the following steps: A nucleophilic attack by LAH on the nitrile derivative. This results in the formation of an imine intermediate. The imine intermediate reacts with another LAH molecule, resulting in the formation of the amine.Here's the reaction equation for this step:Mescaline structure: Mescaline is a psychoactive compound that belongs to the phenethylamine class of alkaloids. The structure of mescaline is as follows: The molecule has three methoxy groups attached to the benzene ring, and it has an amine functional group. The molecule is a white crystalline powder that is soluble in water and alcohol.

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