How many moles of air molecules are contained in a 2.00 L flask at 98.8 kPa and 25.0 degrees of C show work plz

Answer:Reflection, Transmission, and Absorption Reflection is the process by which electromagnetic radiation is returned either at the boundary between two media (surface reflection) or at the interior of a medium (volume reflection), whereas transmission is the passage of electromagnetic radiation through a medium

Explanation:

i cant draw whatever it was but i can answer

Answer:

Look at the image i put

Explanation:

Your welcome please give me brainliest

C-N> C=N > CN The distance between the centers of two atoms that are covalently bonded is known as bond length. The length of the not entirely settled by the number of reinforced electrons. The higher the covalent bond the more grounded the draw between the two particles and the more limited the bond length.

One of the most common bonds in organic chemistry is a carbon–nitrogen bond, which is a covalent bond between carbon and nitrogen. Amines, nitrogen is trivalent and has five valence electrons; the remaining two electrons form a lone pair.

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The bonds in decreasing order of length are: C-N (longest), C=N, and C≡N (shortest). This is because there's an inverse relationship between bond length and bond energy.

In Chemistry, there's an inverse relationship between bond length and bond energy. The bond with higher bond energy tends to be shorter because it is stronger and pulls the atoms closer together. Based on this, the bonds in decreasing order of length (longest to shortest) should be: C-N, C=N and C≡N.

The C-N bond has the lowest bond energy (305 kJ/mol) hence it is the longest. The C=N bond has a higher bond energy (615 kJ/mol) than a single bond hence is shorter. The C≡N bond has the highest bond energy (887 kJ/mol) suggesting it's the shortest of the three.

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Answer-The correct option is option d with says all of the above.

Explanation- All three acids that are given combined together to form acid rain in which nitric and sulphuric acid are stronger acids present while carbonic acid is a weaker one.

The carbon dioxide admitted in air combines with water to form carbonic acid and gives a weak acidic nature to rainwater. Pollution in nature makes sulphur and nitrogen present in air react to form the stronger acids responsible for acid rain.

Answer:

C. Eubacteria

Explanation:

Answer: Eubacteria

Explanation: Animalia, Plantae and Fungi all reproduce through sexual reproduction where as eubacteria can reproduce asexually.

Answer:

This is True

Explanation:

When a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy.

Final answer:

The true statement reflects the fact that energy, specifically bond energy, is needed to break chemical bonds during reactions. This is an essential concept in chemical reactions, as bonds must be broken before new ones can be formed, resulting in changes in energy.

Explanation:

The statement Energy is needed to break bonds in chemical reactions is true. In any chemical reaction, bonds between atoms must be broken so that new bonds can form, and this process requires an initial input of energy. This energy is known as the bond energy, which varies depending on the chemical bond but is specific to each type of bond. When a bond is broken, the stored potential energy within the bond is transformed into other forms, such as kinetic energy, which might manifest as heat.

Furthermore, while it costs energy to break bonds, energy is also released when new bonds are made during the reaction. The overall energy change in a chemical reaction depends on the balance between the energies required to break bonds in the reactants and the energies released when new bonds form in the products. It's critical to understand that the same amount of energy required to break a bond is released when that bond is formed.

In summary, all chemical reactions involve changes in energy, whether absorbing it to break old bonds or releasing it when new bonds form. The concept of bond energy is crucial for explaining the dynamics of chemical reactions and the stability of molecules.

Answer:

[tex]\boxed{\text{-272.83 }^{\circ}\text{C}}[/tex]

Explanation:

We can use the Ideal Gas Law to calculate the temperature.

pV = nRT

[tex]T = \dfrac{pV}{nR}[/tex]

Data:

p = 0.998 atm

V = 0.125 L

n = 4.75 mol

R = 0.082 06 L·atm·K⁻¹mol⁻¹

Calculation:

[tex]T = \dfrac{0.998 \times 0.125}{4.75 \times 0.082 06} =\text{0.320 K}[/tex]

T = (0.320 – 273.15) °C = -272.83 °C

Note: This is an impossible situation. CO₂ solidifies at -78.5 °C.

If CO₂ were an ideal gas, the calculated temperature would be [tex]\boxed{\text{-272.83 }^{\circ}\text{C}}.[/tex]

Answer:

true

Explanation:

It will be True. :)

Answer:

0.0125 mol.

Explanation:

Molarity of a solution is the no. of moles of a solute per 1.0 L of the solution.

M of HCl = 0.5 mol/L.

V = 25.0 mL = 0.025 L.

∴ no. of moles of HCl present in the flask at this time = MV = (0.5 mol/L)(0.025 L) = 0.0125 mol.

N2O4Pb. Chemical Names: 13826-65-8. Lead nitrite. Nitrous acid, lead(2+) salt.

Eutrophication is caused by an excess amount of nutrients within the water. These nutrients can be collected within a lake by runoff from a agricultural area filled with fertilizers, etc etc. The algae within the body of water would grow at a rapid rate, causing a depletion for oxygen within the water and the lack of sunlight underneath the water surface.

The answer is the: Kalvin Scale.

Answer:

I believe it is evaporation but I could be wrong

Explanation:

Answer : The correct option is, (C) Evaporation.

Explanation :

Condensation : It is defined as the process in which the phase changes from the gaseous state to the liquid state as constant temperature.

Infiltration : It is defined as the process in which the water present on the surface of the ground, enters into the soil.

Evaporation : It is defined as the process in which the phase changes from the liquid state to the gaseous state as constant temperature.

Precipitation​ : It is defined as the chemical process in which the solid substance is separated out from the liquid material.

According to the question, during the evaporation process of the hydrologic cycle, the sun heat the surface water, causing the water to change from its liquid state to its gaseous state.

Hence, the correct option is, (C) Evaporation.

Answer:

The vinegar is highly acidic by 100 times than yogurt.

Explanation:

∵ pH = -log[H⁺]

∵ pH = -log[H⁺]

∴ 5 =  -log[H⁺]

∴  [H⁺] = 1.0 x 10⁻⁵ M.

∵ pH = -log[H⁺]

∴ 3 =  -log[H⁺]

∴  [H⁺] = 1.0 x 10⁻³ M.

the ratio of H⁺ in vinegar to that in yogurt = 1.0 x 10⁻³ M / 1.0 x 10⁻⁵ M = 100.0.

∴ The vinegar is highly acidic by 100 times than yogurt.

A shows okay please mark it brainliest

Answer:

The correct answer is option B.

Explanation:

Water is formed formed by combination of oxygen  and hydrogen atoms.

The chemical equation for the formation of the water is given as:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

According to reaction, 2 moles of hydrogen gas reacts with 1 mole of oxygen produce 2 moles of water molecules.

Hydrogen + Oxygen → Water

Amplitude is the correct answer.

The term that is used to describe the height of a wave is called Amplitude. Option A is correct.

A wave can be defined as a disturbance that moves energy from one point to another without transferring matter between these two points. Waves occur in nature, whether they are light waves that enable you to see or sound waves that allow you to hear.

The following are some of the wave properties:

1. Wavelength (λ)The distance between two similar points on a wave, such as the distance between two adjacent crests or two adjacent troughs, is called wavelength. Wavelength is denoted by λ.

2. Amplitude (A)The distance from the equilibrium position to the crest or trough of a wave is called amplitude. The amplitude of a wave is the measure of the amount of energy it contains.

3. Frequency (f)The number of waves that pass a given point per unit time is called frequency. It is measured in Hertz (Hz) or cycles per second (cps).

4. Period (T)The time taken for a wave to complete one full cycle is known as the period. The period of a wave is the inverse of its frequency.

5. Velocity (V)The distance travelled by a wave per unit time is known as velocity. It is the product of the wavelength and frequency of a wave.

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Answer:

The use of plasma is in technology is very broad, including the medical sector, automotive and areas of scientific development

Explanation:

Plasma technology can be used in various ways, where it is a matter of joining materials or modifying the surface properties in a defined way. This technology can modify the surfaces treated, the cleaning of contaminated components, the activation of plastic parts, the etching of fluoroplastics and silicon and the application of coatings to these plastic parts are some applications.

Answer:

C

Explanation:

making fluorescent lights for houses

Answer:

Helium.

Explanation:

Hydrogen in the bomb is used in the process of detonation. A stream of tritium, an isotope of hydrogen is released and this fissionable material is very unstable thus it turns during the detonation to helium 3. This triggers a series of reactions that produce large amounts of heat to the surrounding environment causing destruction.

According to Dalton's atomic theory :

One idea that Dalton taught about atoms is that they are indivisible and indestructible particles.

John Dalton, an English scientist, proposed his atomic theory in the early 19th century. One of the key ideas in Dalton's theory was that atoms are indivisible and indestructible particles. According to Dalton, atoms are the fundamental building blocks of matter, and they cannot be divided into smaller parts or destroyed in chemical reactions.

Dalton based his idea on experimental evidence and observations. He performed numerous chemical experiments and analyzed the results to develop his atomic theory. One of the crucial observations that supported his theory was the law of conservation of mass, which states that in a chemical reaction, matter is neither created nor destroyed. This led Dalton to conclude that atoms, as the fundamental units of matter, must remain intact during chemical reactions.

Dalton's idea of indivisible and indestructible atoms laid the foundation for our modern understanding of atomic structure. However, with advancements in scientific knowledge and the discovery of subatomic particles, we now know that atoms are composed of even smaller particles, such as protons, neutrons, and electrons. Nevertheless, Dalton's concept of atoms as fundamental units of matter that retain their identity in chemical reactions remains a significant contribution to the field of atomic theory.

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Answer:

the ICl4− ion forms a molecular structure that is square planar, an octahedron with two opposite vertices missing.

The shape of ICl₄⁻ is square planar due to the arrangement of six regions of electron density around the central iodine atom.

The molecular shape of ICl₄⁻ is square planar. This ion includes six regions of electron density around the central iodine atom: four bonding pairs with chlorine atoms and two lone pairs of electrons.

Answer:

Electronegativity is the measure of a tendency of an atom to attract the bonding pairs of electrons.

Electronegativity is a measure of how badly an atom wants electrons. The higher an atom's electronegativity, the more greedy it is for electrons, the more it wants to try to steal them from other atom's. This involves a concept called ionic bonding because there are electron givers and electron takers. This has to do with whether an element is a metal or a nonmetal.

Metals are very generous and are willing to let go of or give there electrons away. On the other hand, nonmetals don't give up their electrons.

Answer: Two grams of hydrogen react with one gram of oxygen to form two grams of water.

Answer : The wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.

Explanation :

Synthesis reaction : It is a type of reaction in which the reactants present in elemental state that reacts to give a single product.

It is represented as,

[tex]X+Y\rightarrow XY[/tex]

where, X and Y are the reactants and XY is the product.

The balanced synthesis reaction of water will be,

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

By the stoichiometry we can say that, 2 moles of hydrogen [tex](H_2)[/tex] react with 1 mole of oxygen [tex](O_2)[/tex] to form 2 moles of water [tex](H_2O)[/tex] as a single product.

Or we can say that,

2 molecules of hydrogen react with 1 molecule of oxygen to form 2 molecules of water.

Or,

2 liters of hydrogen react with 1 liter of oxygen to form 2 liters of water.

These three statements are correct.

But the statement, 2 grams of hydrogen react with 1 gram of oxygen to form 2 grams of water are incorrect statement.

Hence, the wrong statement is, Two grams of hydrogen react with one gram of oxygen to form two grams of water.

A) Identical

Hope this helps :)

The molecules are identical. It is replicating the DNA, making exact copies of it. Could you imagine if the DNA in our bodies weren't the same? We'd look pretty weird.

Answer:

Hi there!

It is difficult to remove chlorine out of sodium chloride because in order to separate them you must put that energy into the salt.

Chlorine gas is toxic, and extremely irritating to the eyes and mucous membranes.

Answer:

= 2.64 × 10^7 m

Explanation:

Energy is given by the formula;

E = hc/λ

Where h is Planck’s constant (= 6.626 x 10^-34 Js), c is the speed of light (3.00 x 108 m/s) and λ is the wavelength in meters.

Therefore, wavelength will be given by;

λ = hc/E

  = (6.626× 10^-34 × 3 × 10^8)/(7.53 × 10^-32)

  = 2.64 × 10^7 m

An incendiary fire and an accidental fire are two distinct types of fires. Understanding the difference between these two is essential for investigating and managing fire incidents.

An incendiary fire is deliberately set with the intent to cause damage or harm. It is typically an act of arson, where an individual intentionally ignites a fire for various reasons, such as revenge, or vandalism.  

The person responsible may use accelerants like gasoline to ensure a more intense fire. Incendiary fires often display patterns that indicate intentional ignition points, such as the presence of ignition devices.

On the other hand, an accidental fire occurs due to electrical faults, cooking mishaps, or faulty equipment. These fires are typically the result of human error, equipment failure, or natural phenomena like lightning strikes.

In conclusion, while an incendiary fire is intentionally set to cause harm or destruction, an accidental fire occurs due to unintentional causes. Understanding these differences is crucial in fire investigations to identify the responsible party and prevent future incidents.

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Incendiarism, commonly known as arson, is a purposely-set fire. Such fires are then, by definition not accidental in nature. The accident investigator must be aware of the telltale signs of arson, however, so that he may call in the proper criminal investigators to take over the investigation.

An incendiary fire and an accidental fire are two different types of fires.

An incendiary fire is intentionally set by someone to cause damage or harm. This is often an act of arson, where the person ignites the fire with the purpose of causing destruction, revenge, or vandalism. In incendiary fires, accelerants like gasoline may be used to make the fire more intense. Investigators can often identify intentional ignition points and find clues such as the presence of ignition devices.

On the other hand, an accidental fire occurs due to unintended causes. This can happen because of electrical faults, cooking mishaps, or faulty equipment. Accidental fires are usually the result of human error, equipment failure, or natural events like lightning strikes.

Understanding the difference between these two types of fires is important for investigating fire incidents. It helps investigators identify the responsible party and take measures to prevent future incidents.

An incendiary fire and an accidental fire are two different types of fires based on their origin and intent.

An incendiary fire is intentionally set by someone with the purpose of causing damage, harm, or destruction. It is often an act of arson, where a person deliberately ignites a fire. The individual may have various motivations, such as seeking revenge, committing vandalism, or attempting insurance fraud. In incendiary fires, the person responsible may use accelerants like gasoline to ensure a more intense and widespread fire. These fires often exhibit specific patterns that indicate intentional ignition points, such as the presence of ignition devices or multiple points of origin.

On the other hand, an accidental fire occurs unintentionally and without any malicious intent. It is typically the result of human error, equipment failure, or natural causes. For example, an accidental fire could happen due to electrical faults, such as faulty wiring or overloaded circuits. It could also occur as a result of cooking mishaps, such as leaving a stove unattended or a grease fire getting out of control. Additionally, natural phenomena like lightning strikes can cause accidental fires.

Understanding the difference between these two types of fires is crucial for investigating and managing fire incidents. Investigators need to determine whether a fire was intentionally set or if it was accidental. This information helps identify the responsible party, gather evidence, and take appropriate legal action if necessary. It also aids in implementing preventive measures to reduce the risk of future fire incidents.

I hope this provides a clearer explanation of the difference between an incendiary fire and an accidental fire. Let me know if you have any further questions!

Answer:

B. a black powder

Explanation:

Just got it right on the test Edmentum/PLATO

Final answer:

Forensic scientists perform identification tests on all evidence; DNA analysis is conducted on D. bloodstains and A. hair strands, while other materials like black powder and gloves are tested for chemical composition or trace evidence.

Explanation:

Forensic scientists conduct an identification test on all pieces of physical evidence obtained from a crime scene to determine their origin or match them to a suspect. In the context of the options provided (a hair strand, a black powder, a glove, and bloodstains), forensic scientists would likely perform DNA extraction and analysis on the bloodstains and possibly on the hair strand if the root is intact, as these biological samples contain DNA that can be used to identify a person.

The forensic team would also test the black powder for any chemicals or substances to understand its composition, and examine the glove for DNA, fingerprints, or other trace evidence that might associate it with a suspect or the crime scene.

Answer:

Yes you are right

the reactions catalyzed by hexokinase, phosphofructokinase, and pyruvate kinase

Explanation:

The compound which is obviously incorrect is dihydrogen oxide

The compound name 'mercury chloride' is incorrect because it does not specify the oxidation state of mercury, which can be either I or II.

The compound name that is obviously incorrect among the given options is mercury chloride. The reason this name is incorrect is because it uses the common or trivial name for the element mercury instead of its systematic IUPAC name. In IUPAC nomenclature, mercury can form two common compounds: mercury(I) chloride also known as mercurous chloride (Hg2Cl2) and mercury(II) chloride also known as mercuric chloride (HgCl2). The correct IUPAC nomenclature must specify the oxidation state of mercury since it can have multiple oxidation states. The other names given, such as potassium dichromate (K2Cr2O7), carbon dioxide (CO2), and dihydrogen oxide (H2O), are correct according to IUPAC rules.

Answer:

B. 10:13

Explanation:

It is clear from the following balanced equation:

13 mole of oxygen (O₂) react with butane (C₄H₁₀) to give carbon dioxide (CO₂) and 10 moles of water (H₂O).

∴ The molar ratio between water and oxygen = (no. of moles of water : no. of moles of water) = (10:13)

So, the right choice is:

B. 10:13

Answer:

10:13

Explanation:

Answer via Educere/ Founder's Education

Answer:

endoskeleton

Explanation:

most organisms that we know of have an endoskeleton

(but trust Ariellijo46 more, he probably knows more than that of my knowledge)

Answer:

Exoskeleton

Explanation:

The most common type of skeleton, is exoskeleton.