what is the partial pressure of oxygen (po2) when the air in a testing chamber is mixed so that its oxygen content is 10% and its overall air pressure is 400 mm hg?

Answer:

is simple apply formula dude.

The pattern in the graph may be explained by selection for large males over small males. Large males are more successful in defending territory, so they are more likely to reproduce and pass on their genes.

Territory is an area of land, sea or airspace with a defined boundary that is under the jurisdiction of a particular state, nation or governing body. It is often used to refer to a region or area with specific political, cultural, geographical or historical characteristics. Territory can also refer to a section of a country or region, or a group of related countries or regions, that are considered to be part of a larger political entity. In international law, a territory is an area that is subject to the authority of a state, but is not considered to be part of the state itself.

Over time, this has led to an increase in the proportion of large males relative to small males, resulting in the shifted distribution shown in the graph.

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Answer: A diamond is a heterogeneous mixture. But it could be considered a element because it is made out of carbon which is an element.

Explanation:

\(p = \frac{m}{v} \\ p = \frac{150}{300} \\ p = 0.5kgm^{ - 3} \)

The density of the object is 0.5kgm-3

Answer:

Earth

Explanation:

The Earth and the sun are the part of the solar system and the earth and other planets revolve around the Sun. The solar system is placed in the universe.

In this question, we have to choose two neutral atoms that will present the same number of valence shell electrons, in order to do that, we can look for these elements in the periodic table, the elements that are in the same group will have the same number of electrons in the valence shell, this is the case of Sulfur and Selenium, both are in group 6 and present 6 electrons in the valence shell

The change in Gibbs free energy is -219.4 kJ/mol that can be calculated by using the given entites.

The preferred Gibbs free energy of formation (Gf°) of a compound is the extrade of Gibbs free energy that accompanies the formation of one mole of a substance in its preferred country from its constituent factors of their preferred states (the maximum solid shape of the detail at 1 bar of strain and the required temperature. The preferred loose electricity of formation of a substance is described because the loose-electricity extrade which ends whilst 1 mol of substance is ready from its factors at the usual strain of one atm and a given temperature, commonly 298 K. It is given the symbol ΔGf°.

Delta G= delta G products - delta G reactants

=[2 mol * delta G_f, AgCl(s)]-[(2 mol* delta G_f, Ag(s))+(1 mol *delta G_f, Cl2(g))]

=2 mol* -109.70 kJ/mol - [2 mol * 0 kJ/mol + 1 mol * 0 kJ/mol]

=-219.4 kJ

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An element Y's atom has 11 protons, 11 electrons, and 12 neutrons compared to an element X's atom's 17 protons, 17 electrons, and 18 neutrons.

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Answer:

CO2

Explanation:

A covalent compound is a compound between 2 nonmetals.  For this reason, NaCl and MgO can be eliminated since both contain metals.  While neither H nor Br are metals, in HBr H is acting as a metal.  CO2 is the only choice containing both nonmetals, with both elements acting like nonmetals as well.

Answer:

write in english bro i cant understand your language :)

Answer:could it be kilo

Explanation:it looks like it has the least letters

Answer:

42

Explanation:

Relative mass = number of protons + number of neutrons

Relative mass = 20 + 22

Relative mass = 42

Seal in a labeled plastic bag, then place in the solid waste container.

Due to potential contamination, spill-cleaning materials should always be discarded as hazardous waste. This means that materials like absorbents and cleaning equipment need to be stored and packaged for hazardous waste disposal. After being packaged, the cleaning products should be sent to a facility for the disposal of hazardous waste.

A robust spill response strategy might shield workers from injury and prevent thousands of dollars in damages. You must have a thorough plan in place in the event of a spill if you are working with hazardous materials. Not only must this plan be precisely laid out, but staff members also need to be properly instructed in how to carry it out. The difference between a minor leak and a serious catastrophe could be determined by an emergency spill response strategy.

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The statement that is FALSE about the greenhouse effect is:

The correct option is C.

The greenhouse effect is a natural phenomenon that happens when heat from a planet's host star passes through the atmosphere of the planet and warms the surface of the planet. However, greenhouse gases in the atmosphere prevent part of the heat from going directly to space, making the world warmer.

Some facts about the greenhouse effect are:

The most common greenhouse gas is carbon dioxide and is released by natural activities such as respiration in plants ad animals and the decay of organic matter

However, increased emission of greenhouse gases due to the activities of humans has resulted in global warming.

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Answer: To find the wavelength of the photons emitted by hydrogen atoms when they undergo n = 4 to n = 2 transitions, we can use the Rydberg formula:

1/λ = R_H * (1/n1² - 1/n2²)
Where λ is the wavelength, R_H is the Rydberg constant for hydrogen (approximately 1.097 x 10^7 m^-1), n1 and n2 are the initial and final energy levels, respectively.

Explanation:

The formula used to determine the wavelength of light is known as the Rydberg formula. The energy of an electron changes when it transitions from one atomic orbit to another. The photon of light is produced when the electron transitions from a high-energy orbit to a lower-energy state. Additionally, the photon of light is absorbed by the atom when the electron transitions from a low energy to a higher energy state.

In this case, n1 = 2 and n2 = 4. Plugging the values into the formula, we get:

1/λ = (1.097 x 10^7) * (1/2² - 1/4²)

1/λ = (1.097 x 10^7) * (1/4 - 1/16)

1/λ = (1.097 x 10^7) * (12/64)

λ = 1 / (1.097 x 10^7 * 12/64)

λ ≈ 4.86 x 10^-7 m

Converting meters to nanometers (1 m = 1 x 10^9 nm):

λ ≈ 486 nm

The wavelength of the photons emitted by hydrogen atoms when they undergo n = 4 to n = 2 transitions is approximately 486 nm. This radiation occurs in the visible region of the electromagnetic spectrum.

Answer: The wavelength of the photons emitted by hydrogen atoms when they undergo n = 4 to n = 2 transitions is approximately 486 nm, and this radiation occurs in the visible region of the electromagnetic spectrum (option d).

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The time taken by the same amount of gaseous Xe to effuse from the same container under identical conditions will be inversely proportional to the square root of its molar mass.

How long will it take for the same amount of gaseous Xe to effuse from the same container under identical conditions? According to Graham's law of effusion, the rate of effusion of a gas is inversely proportional to the square root of its molar mass, i.e. the heavier the gas, the slower the effusion rate. The effusion rate of two gases, A and B, can be related to their molar masses, MA and MB, as follows:

RA/RB = √MB/MA

where RA is the rate of effusion of gas A, and RB is the rate of effusion of gas B. The ratio of the rates of effusion is the same as the ratio of the molecular speeds. Therefore, the time required by gases A and B to effuse from a container under identical conditions is also inversely proportional to the square root of their molar masses.TA/TB = √MA/MBwhere TA is the time required for gas A to effuse, and TB is the time required for gas B to effuse.

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Answer: Metallic bonding is a type of chemical bonding and is responsible for several characteristic properties of metals such as their shiny lustre, their malleability, and their conductivities for heat and electricity. Both metallic and covalent bonding can be observed in some metal samples

PLEASE MARK ME BRAINLIST

Electrons move freely among positively charged ions. This is the characteristics of a metallic bond. Therefore, the correct option is option B.

Valence electrons in a metallic link are not bound to a specific pair of atoms, but rather travel freely among a "sea" of positively charged metal ions. These electrons are not assigned to any specific atom and are shared by all metal ions in the metallic lattice.

The electron sea model depicts the valence electron arrangement as a "sea" of negatively charged electrons encircling positively charged metal ions. Metals have strong electrical and thermal conductivity due to electron mobility.

Therefore, the correct option is option B.

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Answer:

There are three  structural isomers of 1-butanol: 2-butanol ), 2-methyl-1-propanol , and 2-methyl-2-propanol . 2-Butanol, or sec-butanol, or sec-butyl alcohol, or s-butyl alcohol, is a four-carbon chain, with the OH group on the second carbon.

Explanation:

You didnt give me a shape or anything so heres your answer hope it helps.

Answer:

refer to attachment OK sir

Answer:

ʟᴇᴛᴛᴇʀ: ᴄ.

Explanation:

ɪʙᴀ ᴀɴɢ ᴇxᴘʟᴀɴᴀᴛɪᴏɴ sᴀ ʟᴀʜᴀᴛ ɴɢ ᴀɴsᴡᴇʀ

Answer:

false

Explanation:

ozone has 3 oxygen atoms

0.264 moles of HNO₃ are present if 0.132 mol of Ba(OH)₂ was needed to neutralize the acid solution.

Generally a balanced chemical equation is defined as an equation where the number of atoms present in each type in the reaction is exactly the same on both reactants and product sides. And the mass, as well as the change, are always equal in a balanced chemical equation.

The balanced chemical reaction is given as:

Ba(OH)₂ + 2HNO₃ = Ba(NO₃)₂ + 2H₂O

1 mole Ba(OH)₂  neutralize 2 mole of HNO₃.

So, 0.141 mol of Ba(OH)₂ was needed to neutralize HNO₃ = 2 × 0.132 = 0.264 mol

So, HNO₃ present = 0.264 mole

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Considering the volume ratio, at the same temperature and pressure 3.6 L of H₂ and excess of N₂ form 2.4 L of NH₃.

Stoichiometry is the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.

Let's consider the following balanced reaction.

N₂ + 3 H₂ → 2 NH₃

We can see that the volume ratio of H₂ to NH₃ is 3:2. The volume of NH₃ produced by the reaction of 3.6 L of H₂ is:

3.6 L H₂ × (2 L NH₃/3 L H₂) = 2.4 L NH₃

Considering the volume ratio, at the same temperature and pressure 3.6 L of H₂ and excess of N₂ form 2.4 L of NH₃.

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The option C, 5 N. Weight is a force that results from the gravitational pull on an object's mass. The weight of an object is directly proportional to its mass. In this case, the melon has a mass of 1 kg.

The force of gravity acting on it on Earth is approximately 9.8 N/kg. Therefore, the weight of the melon can be calculated as follows .Weight = Mass x Acceleration due to gravity Weight = 1 kg x 9.8 N/kg Weight = 9.8 N Therefore, the melon weighs 9.8 N, which is equivalent to option D.

Weight is the force exerted on an object due to gravity and can be calculated using the formula ,Weight = Mass × Acceleration due to gravity ,In this case, the mass of the melon is 1 kg, and the acceleration due to gravity is approximately 9.8 m/s². Weight = 1 kg × 9.8 m/s² = 9.8 N .

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The length of the board is 9 feet.

To find the length of the board, we use the formula for the area of a rectangle, which is given by multiplying the length and width of the rectangle. In this case, we are given the width of the board, which is 1/3 foot.

We are also given that Grant has enough paint to cover 3 square feet. This represents the area that needs to be covered by the paint. Since we want to use up all the paint and cover the whole board, the area of the board must be equal to the area covered by the paint.

So, we can set up an equation using the area formula:

Area = length × width

Substituting the known values, we have:

3 = length × (1/3)

To solve for the length, we can multiply both sides of the equation by 3 to cancel out the fraction:

3 × 3 = length × (1/3) × 3

9 = length

Therefore, the length of the board is 9 feet.

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Answer:

acidic oxides eg carbon dioxide, sulphur dioxide

basic oxides eg sodium oxide, zinc oxide

The major product of the reaction would be benzyl methoxide (C₆H₅CH₂OCH₃).

The reaction is the phase-transfer-catalyzed nucleophilic substitution reaction between benzyl tri-n-butylammonium chloride (BTBAC) and NAOCH₃ (sodium methoxide) in the presence of B₃CBr (tribromoborane).

The benzyl tri-n-butylammonium chloride (BTBAC) acts as the substrate and is likely to undergoes nucleophilic substitution.

Based on the reactants involved, the nucleophilic substitution is expected to occur at the benzyl carbon, resulting in the replacement of the chloride ion with the methoxide ion. The major product of this reaction would be benzyl methoxide.

The reaction can be represented as follows:

BTBAC + CH3O- ⟶ Benzyl Methoxide + Cl-

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