Someone please help me with this

Paper chromatography is especially useful in characterizing amino acids. The different amino acids move at differing rates on the paper because of differences in their R groups.

Answer:

B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O

Explanation:

A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.

In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).

The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.

Let us then consider each of the reactions:

A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.

B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4

C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same

D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.

Therefore, the correct option is B.

Answer:

Where are the answer choices

?

The equation to be reversed to calculate the overall chemical equation for the formation of HCN and H2 from NH3 and CH4 is 2C(s) + N2(g) → 2HCN(g).

Given equations: N2(g) 3H2(g) → 2NH3(g) ……….. Equation 1C(s) 2H2(g) → CH4(g) 4H2(g) ………… Equation 2 2C(s) N2(g) → 2HCN(g) 3H2(g) ………… Equation 3 Let's reverse equation 3 to balance the chemical equations, and then add equations 1 and 2.2HCN(g) + 3H2(g) → 2C(s) + N2(g) ………… Equation 4.

Now add equations 1 and 2 to get the overall equation for the formation of HCN and H2 from NH3 and CH4.N2(g) 3H2(g) → 2NH3(g) ……….. Equation 1C(s) 2H2(g) → CH4(g) 4H2(g) ………… Equation 2 2HCN(g) + 3H2(g) → 2C(s) + N2(g) ………… Equation 4 2NH3(g) + 2CH4(g) → 2HCN(g) + 6H2(g) ………… Equation 5The required equation that needs to be reversed to calculate the overall equation for the formation of HCN and H2 from NH3 and CH4 is 2C(s) + N2(g) → 2HCN(g).

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After three half-lives, 12.5% of the original sample of polonium remains.

Polonium is a very infrequent natural element. It is found in uranium ores but it is careless to extract it. It is obtained by bombarding bismuth-209 with neutrons to give bismuth-210, which then purifies to form polonium. All the industrially produced polonium in the world is made in Russia.Po-210 is an effect of the radioactive decay of uranium-238, which decays to radon-222 and then to polonium. Polonium 210 has a half-life of 138 days. Let the opening value of polonium-218 be 100. First half-life. Therefore, 6.25 % of the original sample remains after 4 half-lives that are 12 minutes. Element Polonium has atomic Number 84, p-block, Mass number is 209.

So we can conclude that polonium is a radioactive, silvery-gray, or black metallic element of the oxygen group in the periodic table.

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Answer:

SO2

Explanation:

SO2 causes acid rain which is leading to dissolving of the marble on the Taj Mahal

SO2 reacts with water to come down as sulfuric acid during acid rains

Gaseous water is present inside boiling water bubbles when a beaker of pure water has been boiling for 30 minutes.

When you first boil water, the bubbles seen in a beaker of water are air bubbles. These are formed from the dissolved gases that come out of the solution if water is in a different atmosphere.

Continuously heating the water beaker, molecules get enough energy to travel from the liquid phase to the gaseous phase. These bubbles are water vapour. When these water bubbles come to the surface of the water they evaporate which reduces the total energy of the system.

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pH of the solution is approximately 2 and pOH of the solution is 0. H₂SO₄ is a strong acid that ionizes completely in water. Its dissociation equation is:

H₂SO₄ → 2H⁺ + SO4²⁻

Since H₂SO₄ dissociates to produce two hydrogen ions (H⁺), the concentration of H⁺ in the solution will be double the initial concentration of H₂SO₄.

Given,

The initial concentration of H₂SO₄ = 0.005 M

The concentration of H⁺ ions will be 2 × 0.005 M = 0.01 M.

pH = -log[H⁺]

pH = -log(0.01) ≈ 2

pOH = -log[OH⁻]

Since H₂SO₄ is a strong acid, it does not produce hydroxide ions (OH⁻) upon dissociation. Therefore, the concentration of OH⁻ in the solution is negligible, and the pOH is essentially 0.

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Answer: Physical change : tearing of paper, fixing of wtaer

Chemical change:  rusting of iron ,  electrolysis of water​, Rancidification

Explanation:

Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance.

Example:  tearing of paper, fixing of wtaer

Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state.

Example: rusting of iron ,  electrolysis of water​, Rancidification

Answer:

5 mol Xe × 6.02×10^23

------------ ----------------

1 1 mol Xe

3.01x10^24

I would calculate on your calculator to make sure

Answer:

2, strong acid

Explanation:

Data obtained from the question. This includes:

[H+] = 0.01 M

pH =?

pH of a solution can be obtained by using the following formula:

pH = –Log [H+]

pH = –Log 0.01

pH = 2

The pH of a solution ranging between 0 and 6 is declared to be an acid solution. The smaller the pH value, the stronger the acid.

Since the pH of the above solution is 2, it means the solution is a strong acid.

In the galvanic cell that Cassandra builds with a zinc electrode in a Zn(NO3)2 solution and a copper electrode in a CuCl2 solution at 298 K, the species produced at the anode is Zn2+.


1. In a galvanic cell, the anode is where oxidation occurs.
2. The zinc electrode (Zn) will act as the anode, as it has a lower reduction potential compared to the copper electrode (Cu).
3. During the oxidation process at the anode, the zinc electrode loses electrons and becomes Zn2+ ions, which dissolve into the aqueous Zn(NO3)2 solution.
4. Therefore, the species produced at the anode in this galvanic cell is Zn2+.

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The total pressure of the gas mixture is approximately 68.97 kPa.

To calculate the total pressure of the gas mixture, we need to consider the partial pressures of each component.

Given:

Mass of methane (CH4) = 359 mg

Mass of argon (Ar) = 212 mg

Mass of nitrogen (N2) = 256 mg

Partial pressure of nitrogen (N2) = 16 kPa

Step 1: Convert the masses of each component to moles using their respective molar masses:

Molar mass of methane (CH4) = 16.04 g/mol

Molar mass of argon (Ar) = 39.95 g/mol

Molar mass of nitrogen (N2) = 28.01 g/mol

Number of moles of methane (nCH4) = (359 mg / 1000) / (16.04 g/mol)

Number of moles of argon (nAr) = (212 mg / 1000) / (39.95 g/mol)

Number of moles of nitrogen (nN2) = (256 mg / 1000) / (28.01 g/mol)

Step 2: Calculate the mole fractions of each component:

Mole fraction of methane (χCH4) = nCH4 / (nCH4 + nAr + nN2)

Mole fraction of argon (χAr) = nAr / (nCH4 + nAr + nN2)

Mole fraction of nitrogen (χN2) = nN2 / (nCH4 + nAr + nN2)

Step 3: Calculate the partial pressures of each component:

Partial pressure of methane (PCH4) = χCH4 * Total pressure

Partial pressure of argon (PAr) = χAr * Total pressure

Partial pressure of nitrogen (PN2) = χN2 * Total pressure

Since the partial pressure of nitrogen is given as 16 kPa, we can substitute the values into the equation above to solve for the total pressure:

PN2 = χN2 * Total pressure

16 kPa = χN2 * Total pressure

Step 4: Solve for the total pressure (Total pressure = PN2 / χN2):

Total pressure = 16 kPa / χN2

Let's perform the calculations:

Step 1:

nCH4 = (359 mg / 1000) / (16.04 g/mol) ≈ 0.022 mol

nAr = (212 mg / 1000) / (39.95 g/mol) ≈ 0.0053 mol

nN2 = (256 mg / 1000) / (28.01 g/mol) ≈ 0.0091 mol

Step 2:

χCH4 = nCH4 / (nCH4 + nAr + nN2) ≈ 0.615

χAr = nAr / (nCH4 + nAr + nN2) ≈ 0.153

χN2 = nN2 / (nCH4 + nAr + nN2) ≈ 0.232

Step 3:

PCH4 = χCH4 * Total pressure

PAr = χAr * Total pressure

PN2 = χN2 * Total pressure

Step 4:

Total pressure = PN2 / χN2 = (16 kPa) / (0.232) ≈ 68.97 kPa

Therefore, the total pressure of the gas mixture is approximately 68.97 kPa.

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Answer:

true

Explanation:

Answer:

45

Explanation:

yes i need help please

High-quality scientific research is characterized by several key criteria. Three examples of such criteria include: rigorous experimental design and methodology, reliable data analysis and interpretation, and clear and transparent reporting of results.

These criteria ensure that research is conducted in a systematic and reliable manner, leading to trustworthy and valid findings.

Rigorous Experimental Design and Methodology: High-quality scientific research requires a well-designed experimental approach. This involves careful planning, proper control groups, randomization, and replication. A rigorous methodology ensures that experiments are conducted under controlled conditions, minimizing bias and confounding variables, and allowing for accurate and reliable data collection.

Reliable Data Analysis and Interpretation: After data collection, high-quality research involves thorough and appropriate analysis of the data. This includes using appropriate statistical methods to evaluate the significance of the results and drawing valid conclusions. Proper data analysis helps researchers identify patterns, trends, and relationships, supporting or refuting their hypotheses in an objective and reliable manner.

Clear and Transparent Reporting of Results: High-quality research demands transparent reporting of the methods, procedures, and findings. This includes providing detailed descriptions of the experimental setup, data collection processes, and statistical analyses used. Clear reporting allows other researchers to replicate the study and verify its results. Additionally, complete reporting ensures that readers can understand the research methodology and draw their own conclusions based on the evidence presented.

By adhering to these criteria, high-quality scientific research maintains integrity, credibility, and reproducibility. It fosters trust among the scientific community and facilitates the advancement of knowledge by building upon reliable foundations.

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The expansion of plasma—a clump of charged particles—from the sun corona produces the solar wind (outermost atmosphere).

The solar wind is a stream of energetic, charged particles, principally protons and electrons, traveling across the solar system from the Sun at speeds of up to 900 km/s and a temperature of one million degrees (Celsius). It is created from plasma.

A stream of powerful particles that the Sun ejects is known as the solar wind. These include the hydrogen electrons and protons as well as atomic nuclei such as helium, collectively known as alpha particles. Additionally, "heavy ions" and the atomic nuclei of carbon, nitrogen, oxygen, neon, and magnesium can be found in trace amounts.

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Answer:

One.

Explanation:

Both sides of the equation need 2 Silver atoms, 1 Nitrogen, 3 Oxygen and 1 Copper to be balanced which is the same as the side of reactants.

Answer:

1-T

2-F

3-T

4-T

Explanation:

big brain

Answer:

if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m

Explanation:

we know,

1m= 1000mm

as given 5X 10^3 mm we have to convert to meter

now  5X 10^3 mm= 5X 10^3/1000=5m

but if its  5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m

thank u,

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

1 is not correct ......

All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct. Therefore, option 1 is correct.

When an atom has the same number of electrons and protons, it has the same number of negative (electrons) and positive (protons) electric charges (the protons).

As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.

The sodium atom contains 11 electrons. As sodium atom loses one electron to form sodium ion, sodium ion has ten electrons. Only sodium atoms have a strong reaction with water, whereas sodium ions do not.

Thus, All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct, option 1 is correct.

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Answer:: 1100 j

Explanation:

Solid aluminum has a specific heat capacity of 0.90 J/ gK joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K is 11.080 J

Heat is the transfer of kinetic energy from one medium or object to another from an energy source to a medium or object

Here given data is

Specific heat capacity = 0.90 J/gK

Temperature = 300. K to 350. K = 350 - 300 = 50 K

Mass =  24.0 grams

We have to calculate the heat = ?

Q =mCΔT

Q =  24.0 grams× 0.90×50 K

Q = 11.080 J

11.080 J  heat are absorbed to raise the temperature

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Answer:

26.98

almost 27 years

pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.

When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.

In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.

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We need ti find how many elements there are in the first period and what are these.

To know what is the first period we must use that

Seeing the periodic table, the first row has two elements.

We can see that these elements are H ( hydrogen ) and He ( helium ).

ANSWER:

Firs period in the periodic table has two elements and they are called hydrogen and helium.

Answer:

When Darrell is radioed back he would be asked to  “Go for it!”

Explanation:

Here we are given the fuel as C₅H₁₂, therefore the combustion reaction is given as

C₅H₁₂ + 8O₂ → 5CO₂ + H₂O

Mass of oxygen consumed on each lap = 300 g

Molar mass of oxygen gas O₂ = 32 g/mol

Number of moles of oxygen n 300 g of O₂ =

(300 g)/(32 g/mol) = 9.375 moles

For complete combustion, one mole of oxygen gas reacts with one mole C₅H₁₂, to form 5 moles of CO₂ and one mole of H₂O

Therefore 9.375 moles of oxygen ill combine with 9.375/8 or 1.172 moles of C₅H₁₂

Mass of 1.172 moles is given as

Mass = Number of moles × Molar mass

= 1.172 moles × 72.15 g/mole = 84.551 g

Therefore the mass of fuel to complete one lap = 84.551 g

However there are 25 gallons or 3.5 kg in the tank therefore we have

Number of laps the fuel in the tank can last  = Mass of fuel in the tank/ Mass of fuel consumed per lap

= 3.5/84.551 = 41.395 laps.

Number of laps the fuel in the tank can last  = 41.395 laps.

Since there are 20 laps left to complete, which is less than 41.395 laps left in the fuel tank of the vehicle, then Darrell would be asked to go for it.

Answer:

Explanation:

The number of particles can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is 6.02 × 10²³ entities

We have

N = 4.8 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer: I'm willing to help you find the formula for that ionic crystal but, I can't see anything.

The ionic crystal contains a total of 6 Ba atoms and 6 oxygen atoms. Hence they are in 1 : 1 ratio and the formula of the ionic compound is BaO.

Ionic compounds are formed between metals and non-metals. Ionic bond is formed by the lose of electrons from the metals to the nonmetals. The chemical formula of the ionic compounds are written with the cationic symbol first.

The given ionic crystal is formed with barium and oxygen atoms. Valency of barium is 2 and that of oxygen is also 2. Thus, barium loses two electrons to oxygen forming BaO.

The given crystal lattice consists of 3 barium atoms and 3 oxygen atoms in front face and 3 Ba and 3 o in back face also. Thus, both are 6. They are in the ratio of 1 : 1. Hence, the compound is named as BaO.

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