Using the human species as an example, explain why physical appearance or morphology is NOT always useful for identifying organisms belonging to the same species.

Answer:

it is formed by covalent bonds. the oxygen atom shares one elctron with each chlorine atom, forming single covalent bonds ( cl — o — cl )

Answer:

pOH = 10.16

Explanation:

pOH is a measurement in chemistry that could be obtained with the equation:

pOH = 14 - pH

The mathematical definition of the pOH is:

pOH = -log [OH⁻]

If the pH of the solution is 3.84, the pOH is:

pOH = 14 - 3.84

Answer:

10.25

Explanation:

Got it correct!

Answer is:

When one person exerts more force than the other so that the forces are unbalanced........ maybe, im not sure if im right

Answer:

c

Explanation:

Answer:

ALPHA

Explanation:

The ΔG is 5.61 kJ.

To calculate the ΔG of a chemical reaction, it is necessary to use the formula of ΔG, and replace the values:

Remember to convert 93.0 J to kJ to solve it.

So, the ΔG for this reaction is 5.61 kJ.

When benzene is nitrated with a mixture of nitric and sulfuric acids, the electrophile that attacks the benzene ring is a nitronium ion, which has the chemical formula NO2+. This electrophile is generated in situ from the reaction between nitric acid and sulfuric acid, as shown below:

HNO3 + H2SO4 → NO2+ + HSO4- + H2O

The nitronium ion has a formal positive charge on the nitrogen atom (+1) and a formal negative charge on one of the oxygen atoms (-1), giving it an overall formal charge of 0. The three atoms that make up the nitronium ion are nitrogen (N), oxygen (O), and oxygen (O), arranged in a linear configuration. The nitrogen atom is the electrophilic center, as it is the site of positive charge and the atom that attacks the benzene ring in the nitration reaction.

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"lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air)

Answer:

the answer must have to be A

Answer:

2 L is the new volume

Explanation:

We can apply the Ideal Gases Law to solve the problem.

At STP, we kwow that 1 mol of gas occupy a volume of 22.4 L

Then, how many moles do we have in 1 L?

Let's do it by a rule of three:

(1L . 1 mol) / 22.4L = 0.0446 moles

These moles are at 1 atm and 273 K of temperature, so let's change our conditions.

P . V = n . R .T

1 atm . V = 0.0446 mol . 0.082 L.atm/mol K . 546 K

V = 2 L

If we pay attention, we can notice that, if we double temperature, we double the volume.

A gas occupies 1.0 L at STP. If the temperature is raised to 546 K, the volume increases to 2.0 L.

The volume of a sample of a gas is 1.0 L (V₁) at standard temperature (T₁ = 273.15 K) and standard pressure (1 atm).

If the pressure remains constant and the temperature is raised to 546 K (T₂), we can calculate the new volume (V₂) using Charles' law.

\(\frac{V_1}{T_1} = \frac{V_2}{T_2} \\\\V_2 = \frac{V_1 \times T_2 }{T_1} = \frac{1.0 L \times 546K }{273.15K} = 2.0 L\)

A gas occupies 1.0 L at STP. If the temperature is raised to 546 K, the volume increases to 2.0 L.

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Based on the chemical equation of the reaction, S (sulfur) was oxidized and N (nitrogen) was reduced.

The correct option is C.

A redox reaction is a name for a reduction-oxidation reaction.

In a redox reaction, oxidation and reduction occur during the reaction.

Oxidation involves a loss of electrons and results in an increase in the oxidation number of the oxidized species.

Reduction involves a gain of electrons and results in a decrease in the oxidation number of the reduced species.

Considering the given equation of reaction:

3 SO₂ + 2 HNO₃ + 2 H₂O → 3 H₂SO₄ + 2 NO

The oxidation number of nitrogen changes from +5 in HNO₃to +2 in NO. Hence, it is reduced.

The oxidation number of sulfur changes from +4 tin SO₂ to +6 in H₂SO₄. Hence it is oxidized.

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Answer:

4

Explanation:

at room temperature and standard pressure methane is a colourless gas. Methane consist of one carbon atom bonded to 4 hydrogen atom and it also forms the major percentage of natural gas

Regarding methane, it is true that:

Let's consider which of the following is true concerning methane?

1) It is a gas at standard temperature and pressure. TRUE. Like most small hydrocarbons, methane is a gas at STP.

2) It consists of one carbon atom and four hydrogen atoms. TRUE. The chemical formula of methane is CH₄.

3) It is the major component of natural gas. TRUE. It represents about 95 mole % of natural gas.

4) All of the above. TRUE.

Regarding methane, it is true that:

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Answer:

75000 Hz

Explanation:

f = V / λ (f= frequency, v=velocity of wave, lambda= wavelength)

alternatively, f = c / λ (f= frequency, c= speed of light- 3.00x10^8 m/s, lambda= wavelength)

f= [3.00x10^8 m/s]/[4000 m]

=75000 Hz

Fossil fuels are formed over millions of years from the remains of dead plants and animals that have been buried under layers of rock and sediment.

These fuels contain stored carbon that was originally absorbed by the plants and animals during their lifetime. Examples of fossil fuels include coal, oil, and natural gas. When these fuels are burned for energy, the carbon is released into the atmosphere in the form of carbon dioxide, which contributes to climate change. Natural gas is a combustible mixture of hydrocarbons and other organic compounds that is found beneath the Earth's surface. Coal is a non-renewable fossil fuel that is used to generate electricity and heat, and is also used in the production of steel, cement, and other industrial products.

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Answer:

C

Explanation:

It's simple because there were so many quantitative analysis of error and they didn't had the kind of observations as we have now

Answer:

47.596008

Explanation:

we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

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Answer: The electronic configuration of selenium is \(1s^22s^22p^63s^23p^64s^23d^{10}4p^4\)

Explanation:

The atomic number is defined as the number of protons or number of electrons present in a neutral atom.

Number of electrons will be equal to the atomic number of an atom.

Electronic configuration is defined as the representation of electrons in an atom.

Selenium is the 34th element of the periodic table.

The electronic configuration of Selenium is \(1s^22s^22p^63s^23p^64s^23d^{10}4p^4\)

It has 6 electrons that are present in the outermost shell.

Answer: because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

Answer:

It is melting which is a physical change.

Explanation:

\(.\)

The process is a physical change because the chocolate and marshmallow melted.

You included no options but this is a physical change because the question mentioned that the chocolate melted.

A physical change occurs when the state of matter changes but the chemical properties remain the same. Physical changes include:

In conclusion therefore, the chocolate and marshmallow melted and so underwent a physical change.

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The branch of physics known as "atomic physics" focuses on the study of atoms as self-contained systems made up of electrons and nuclei.

In general, the term "atomic physics" refers to the study of the structure of atoms and the interactions between atoms. The arrangement of electrons around the nucleus and the mechanisms by which this arrangement changes are major topics of interest. Unless specifically stated to consist of ions and neutral atoms, the term "atom" is meant to include ions.

Atomic physics is a term that can refer to nuclear energy and nuclear weapons.

Atomic physics, which treats an atom as a system consisting of a nucleus and electrons, differs from nuclear physics, which studies nuclear reactions and the unique properties of atomic nuclei.

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70.9-gram sample of \(Cl_{2}\) gas will occupy Opton C. 22.4 liters at STP.

To determine the volume occupied by the sample of \(Cl_{2}\) (g) at STP, we can use the ideal gas law equation, PV = nRT

where P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (K).

First, calculate the number of moles of \(Cl_{2}\) (g) using its molar mass. The molar mass  \(Cl_{2}\) is 70.9 grams/mol.

Number of moles (n) = mass (m) / molar mass (M)

n = 70.9 g / 70.9 g/mol

n = 1 mol

Now, we can calculate the volume using the ideal gas law:

V = (nRT) / P

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

V ≈ 22.4 L

Therefore, the correct answer is C. 22.4 L.

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The effective leader qualities demonstrated by Caleb are problem-solving skills, good time management, and effective scheduling. Thus, options A, B, and D are correct.

The project led by Caleb is based on natural resources. The team plays an important task in completing important and achieving the targets and goals for a project plays.

Caleb's team has lost focus on the project. The team leader is responsible to manage his team and encouraging them to achieve targets.

Caleb manages his team by arranging meetings and analyzing members' progress.

The leadership qualities that are demonstrated by Caleb are problem-solving skills, good time management, and effective scheduling. Thus, options A, B, and D are correct.

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Answer:

a & e

Explanation:

A piece of granite crumbles after being repeatedly battered by powerful waves and the ions in a marble sculpture react with water to generate acids or pores in the structure.

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, combines with certain metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid (acid catalysis).

In industrial & organic chemistry, acids are utilized as catalysts; for instance, sulfuric acid is being used in extremely high volumes during the alkene process to create gasoline. Some acids, including hydrochloric, phosphorus, and sulfuric acids, can also cause condensation and hydration reactions.

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Answer:

Since all of them are aqueous solutions, the solvent in each solution is H2O. Based on the Raoult's Law, we only have to determine which solution contains the highest mole fraction of the solvent, H2O. The solution that will have the lowest vapor pressure is a. 0.20 m Na2SO4.

Explanation:

plz give brainliest

Answer:

acids and bases cancel each other out. acids increase H+ ions while bases release H+ ions

Explanation:

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

Explanation:

Zn+H

2

​

SO

4

​

→ZnSO

4

​

+H

2

​

Therefore, Student C had the purest crystals and the correct product

Melting point determination is a useful technique for checking the purity and identity of the crystalline solid. The melting point of a compound is the temperature range where the solid changes to a liquid. The literature value for the melting point of a product is an important property to know, and it can be compared to the values obtained experimentally.

The melting point of the compound is an important factor in determining its purity. A pure compound has a sharp melting point, whereas an impure compound has a broad melting range that is lower than the pure melting point.

The student with the purest crystals and the correct product was Student C.

Student A's melting point range is too low, which indicates that the compound is impure.

The melting point range of Student B is too high, which indicates that the compound is impure.

The melting point range of Student D is close to the literature value, but it is still too broad, which indicates that the compound is impure.

Student C's melting point range is close to the literature value, and it is relatively sharp, which indicates that the compound is pure.

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