how many scientists have an element named after them?

Taking into account the definition of frecuency, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

In other words, the frequency in wave phenomena, such as sound, electromagnetic waves (such as radio or light), electrical signals or other waves, expresses the number of times the phenomenon is repeated per unit of time. For example, if a wave repeats ten times per second, it means that it has a frequency of ten cycles per second.

Finally, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.

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The point that we can see in the graph from 0 s to 2s is the point of constant velocity.

A horizontal line on a velocity-time graph indicates the location of the point of constant velocity. On the graph, a horizontal line denotes that the object's velocity was constant during that time.

Keep in mind that a velocity-time graph shows how an object's velocity changes over time. An object is said to be travelling at a constant speed if a horizontal line shows that it is doing so while maintaining its direction and speed.

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The value of ecell at 25°c if [\(h_2so_4\)] is 10.0 m will be  1.765 V.

To calculate the cell potential (Ecell) of a redox reaction, we need to know the standard electrode potential (E°) of each half-reaction and the concentrations of the reactants and products.

Given that the concentration of \(H_2SO_4\) is 10.0 M, we can assume that the reaction is:

\(H_2SO_4\)(aq) → 2H+(aq) + \(SO_{42}\)-(aq)

The standard electrode potentials for the reduction of H+ to H2 and for the oxidation of \(SO_{42}\)- to \(S^2O_{48}\)- are:

H+(aq) + e- → 1/2 H2(g) E° = 0.00 V

2H2O(l) → O2(g) + 4H+(aq) + 4e- E° = 1.23 V

\(SO_{42}\)-(aq) → 2e- + \(S^2O_{48}\)-(aq) E° = 2.01 V

The overall reaction can be obtained by adding the half-reactions:

\(H_2SO_4\)(aq) + 2e- → \(S^2O_{48}\)-(aq) + 2H+(aq)

The cell potential can be calculated using the Nernst equation:

Ecell = E° - (RT/nF) ln Q

where:

E° is the standard cell potential

R is the gas constant (8.314 J/mol·K)

T is the temperature in Kelvin (25°C = 298.15 K)

n is the number of electrons transferred (2 in this case)

F is the Faraday constant (96,485 C/mol)

Q is the reaction quotient, which can be calculated as:

\(Q = [H+]^2 [S^2O_82-] / [S^2O_{48}]\)

At 25°C, the value of RT/F is 0.0257 V.

Substituting the values:

Ecell = 2.01 V - (0.0257 V/2) ln [(10.0 M)^2/1]

Ecell = 2.01 V - 0.0129 ln (100)

Ecell = 1.765 V

Therefore, the cell potential (Ecell) at 25°C is 1.765 V.

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The use of cold methanol is important because it is used to recrystallize or solidify the product.

Since, ice bath is also used in nitration of methyl benzoate because in this reaction the concentrated acid like sulfuric acid is used with water and it is very exothermic.

The formation pure solid from the impure solid compound by mixing with hot solvent and form saturated solution. Now, this solution as cools and pure crystal grows when solubility of the compound decreases. This whole process is called re-crystallization.

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Fungus that contains the psychedelic compounds psilocybin and psilocin; been used for thousands of years as a hallucinogen. This statement is true.

Psilocybin is also called as magic mushrooms. They are naturally occurring, and they are consumed for their hallucinogenic effects.

They are used as psychedelic drugs, that means they can affect all the senses, converting a person's thinking, sense of time and emotions.

Thus, Fungus that contains the psychedelic compounds psilocybin and psilocin; been used for thousands of years as a hallucinogen. This statement is true.

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The purpose of the concentrated sulfuric acid used in the first step depends on the specific process you are referring to. However, in general,

concentrated sulfuric acid is often used as a strong acidic catalyst or dehydrating agent. Its high reactivity and ability to protonate organic molecules make it useful for promoting reactions such as esterification or dehydration. In some cases. it may also be used to remove water from a reaction mixture by forming an azeotrope with water that can be easily separated.

In summar the purpose of concentrated sulfuric acid in the first step is likely to either catalyze a reaction or remove water from the system.The purpose of the concentrated sulfuric acid used in the first step is to serve as a dehydrating agent. It helps remove water from the reaction mixture, which allows the desired reaction to proceed more efficiently. In this case, the concentrated sulfuric acid assists in driving the reaction forward and ensuring a successful outcome.

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0.116 V is the e value for the oxidation of cytochrome c by the cue redox center in complex iv when the ratio of cyst c (fe3 ) /cyst c (fe2 ) is 20 and the ratio of cue (cu2 )/cue (cu ) is 3.

When cytochrome c is oxidized by mitochondrial cytochrome oxidase (COX), it attaches to Apaf-1 to produce the apoptozole, which activates pro-caspase-9 and causes cell death. Cyst can be created from cytosolic cytochrome c. In the IMS, oxidized cytochrome c can scavenge superoxide without converting it into H2O2, a process that happens naturally but is accelerated by SOD. The benefit of scavenging superoxide independently of H2O2 synthesis is reducing the possibility of hydroxyl radical generation via the Fenton reaction.

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Extensive properties, such as mass and volume, depend on the amount of matter that is being measured. ... Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity

It is thought that global dimming is probably due to the increased presence of aerosol particles in Earth's atmosphere, caused by pollution, dust, or volcanic eruptions. Aerosols and other particulates absorb solar energy and reflect sunlight back into space. ... Water droplets in clouds coalesce around the particles.

Global Dimming

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The element that is oxidized in the reaction Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2(g) is iron (Fe). When determining the oxidation state of iron (Fe), we use the rule that the oxidation state of a monatomic ion is equal to its charge.

The oxidation state of Fe in Fe(CO)5 is zero. In Fe(CO)4I2, the oxidation state of Fe is +2. So, Fe is oxidized in the reaction.Balancing the redox reaction:Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2(g)The oxidation half-reaction is:Fe(CO)5 (l) → Fe(CO)4I2 (s) + I- (aq)The reduction half-reaction is:2H+ (aq) + 2e- → H2 (g)By adding both half-reactions, the balanced redox reaction is:Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2(g)The oxidation half-reaction shows that iron (Fe) has lost electrons, thereby being oxidized.

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Assuming our planet to be a perfect sphere, then the average density of the Earth is approximately 5.514 g/cm^3.

The average density of the Earth can be calculated as follows:

The volume of a sphere can be calculated using the formula:

V = (4/3) * π * r^3

Where r is the radius of the sphere. The radius of the Earth is approximately 6,371 km.

The mass of the Earth is known to be approximately 5.97 x 10^24 kg.

So, the average density of the Earth can be calculated as follows:

density = mass / volume

density = 5.97 x 10^24 kg / [(4/3) * π * (6,371 x 10^3 m)^3]

density = 5.97 x 10^24 kg / (1.08 x 10^21 m^3)

density = 5514 kg/m^3

To convert from kilograms per cubic meter to grams per cubic centimeter, we multiply by 1000:

density = 5514 kg/m^3 * 1000 g/kg = 5.514 x 10^6 g/m^3 = 5.514 g/cm^3

So, the average density of the Earth is approximately 5.514 g/cm^3.

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The reported molar absorptivity of red dye number three is 0.715 mol/L*cm. If a solution of red dye number three displays an absorbance of 1.358 and has a cuvette path length of 0.244 cm, you can use the Beer-Lambert law to calculate the concentration of the solution. The Beer-Lambert law is given by:

A = ε * c * l

Where A is the absorbance, ε is the molar absorptivity (0.715 mol/L*cm), c is the concentration, and l is the path length of the cuvette (0.244 cm).

Rearrange the equation to solve for the concentration (c):

c = A / (ε * l)

Substitute the given values:

c = 1.358 / (0.715 * 0.244)

Calculate the concentration:

c ≈ 7.724 mol/L

Therefore, the concentration of the red dye number three solution is approximately 7.724 mol/L.

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ANSWER

EXPLANATION

Given that

The mass of the gas is 10.0g

The volume of the gas is 7.69L

The pressure of the gas is 1.00 atm

The temperature of the gas is 27 degrees Celcius

Follow the steps below to find the molar mass of the gas

Step1; Assume the gas is an ideal gas

Step 2; Find the number of mole of the gas using the equation above

Step 3; find the molar mass of the sample

Answer: D

Explanation:

The element(s) that has/have a mass of exactly 1.000 amu per nucleon is/are carbon and astatine.

Carbon has an atomic number of 6 and a standard atomic weight of approximately 12.01 atomic mass units (amu). Since carbon has 6 protons and 6 neutrons in its nucleus, the average mass per nucleon (proton or neutron) can be calculated as 12.01 amu / 12 nucleons, which gives a value of exactly 1.000 amu per nucleon.

Astatine, on the other hand, has an atomic number of 85 and a standard atomic weight of approximately 210 amu. Although astatine is a radioactive element with a short half-life, its atomic mass is such that it also has a mass of approximately 1.000 amu per nucleon.

It's worth noting that option A, stating that the mass per nucleon first decreases then increases, does not directly relate to the specific elements with a mass of exactly 1.000 amu per nucleon. Option B, suggesting that the element with the lowest mass per nucleon is the one with an atomic number of about 25, is not accurate in identifying the elements with exactly 1.000 amu per nucleon. Only option C correctly identifies carbon and astatine as elements with a mass of exactly 1.000 amu per nucleon.

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Answer:  but thx for the points

Explanation:

Answer:

Explanation:

Substances which have their density less than the density of water that's 1 g/cm³ will float on it.

From the question the substance with it's density less than that of water is solid C so it's likely for it to float on water.

Hope this helps you

Answer:

B. chemical or physical changes occur when the property is measured

Explanation:

Answer: A

Explanation: Based on the Law of conservation of mass the total mass of the reactants will equal to the total mass of the products. This happens as matter is not destroyed.

Answer:

6. 10 protons

10 electrons

neutral

7. 10 protons

8. Neon

9. 10 electrons

11. No

12. it's not an ion

Explanation:

count the number of electron in the shells, the number of electrons is equal to the number of protons, which is equal to the atomic number

Answer: 5 atm

Explanation: The total pressure of a mixture of gases is given by the Ideal Gas Law: PV = nRT, where P is the total pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvins.

In a constant temperature scenario, where the volume and the number of moles of the gases are kept constant, the total pressure of the mixture is simply the sum of the individual pressures of the gases. So in this case, the total pressure will be 2 atm + 3 atm = 5 atm.

The well-known ports range from 0 to 1023. These ports are reserved for specific services and protocols, and they are commonly used by system processes or by programs executed by privileged users.

Here is a breakdown of some commonly known ports within the well-known port range:

20: FTP Data

21: FTP Control

22: SSH (Secure Shell)

23: Telnet

25: SMTP (Simple Mail Transfer Protocol)

53: DNS (Domain Name System)

80: HTTP (Hypertext Transfer Protocol)

110: POP3 (Post Office Protocol version 3)

143: IMAP (Internet Message Access Protocol)

443: HTTPS (HTTP Secure)

465: SMTP over SSL/TLS

587: SMTP Submission

993: IMAPS (IMAP over SSL/TLS)

995: POP3S (POP3 over SSL/TLS)

These are just a few examples, and there are many other services and protocols assigned to specific well-known ports within the range of 0 to 1023.

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Reverse osmosis and distillation are methods of making seawater appropriate for drinking.

Two highly effective procedures that can offer optimal purification results when dealing with saline or polluted bodies of water include Reverse Osmosis and Distillation.

The former technique operates by selectively filtering unwanted particles out of solution through an ultrafine mesh material- such as a synthetic membrane and generally removes salt in this way.

Distillation employs heat to vaporize liquids that ultimately leaves contaminants behind. The resulting purified waters produced by each method have widespread use cases across various industries-e.g., Agriculture, Energy and Mining- and can even be directly consumed in households.

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When, where, and how much a gene is expressed in a cell depends on the histones and epigenetic elements working together.

In eukaryotic cells, there are proteins called histones that serve two purposes. They support the maintenance of DNA in a compact state and control the loosening the tightening of DNA strands, which controls the expression of genes.

Epigenetic factors are substances that alter the gene to control how a gene expresses itself. Both of these modifications are not heritable and do not result in mutations. These are transient alterations such DNA remodeling, methylation, and alkylation, among others.

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Answer:Atoms acquire the stable electron structure of a noble gas by losing electrons. An atom of an element in Group 1A has seven valence electrons. Among Group 1A and 2A elements, the group number is equal to the number of valence electrons in an atom of that element.

Explanation: Hope this help have an wonderful day and stay safe! :D

Some minerals are only stable under specific pressure and temperature conditions, which leads to metamorphism. Chemical processes transform the minerals in the rock into an assemblage that is stable under the new pressure and temperature circumstances. This happens when pressure and temperature change.

Like heat, pressure increases with depth. The mineral gaps within the Rock may even be forced out by this pressure. Due of this, the mixture is denser.

Metamorphic rocks are created when heat and pressure combine to transform an existing rock into a new one. Contact metamorphism occurs when heated magma makes contact with rock.

Pressure and heat rise with depth. The mineral holes in the rock may really be forced out by this pressure. The upshot of this is that the rocks get denser. Instead of cracking or breaking, the rock flows as a result of the heat and pressure.

Regional metamorphism significantly modifies existing rocks under the intense heat and pressure of tectonic movements.

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The molecular formula of the compound is \(C_{4} H_{8}\)

We can calculate the empirical formula from the carbon and hydrogen percentage by assuming that we have 100 g of the substance:
carbon: 85.63 g / 12 g/mol = 7.1358 mol
hydrogen: 14.37 g / 1 g/mol = 14.37 mol
We divide the moles with the smallest amount to get a mole ratio:
7.1358 mol / 7.1358 mol = 1
14.37 mol / 7.1358 mol = 2.01
So the empirical formula is \(CH_{2}\), with the molar mass of 12 + 2 * 1 = 14 g/mol.
We can calculate the molar mass of the compound using ideal gas laws. At STP, 1 mol of any gas has a volume of 22.4 L, so:
1 mol : 22.4 L = X : 0.255 L
X = 1 mol * 0.255 L / 22.4 L = 0.0114 mol
From this, we calculate the molar mass of the gas:
0.0114 mol : 0.646 g = 1 mol : X
X = 0.646 g * 1 mol / 0.0114 mol = 56.67 g/mol
To get the molecular formula, we divide the molar mass of the gas by the molar mass of the empirical formula:
56 g/mol / 14 g/mol = 4
So now we multiply the empirical formula by 4 to get the molecular formula:
\(C_{4} H_{8}\)

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