Which of the following is true about the gas we call "air." (the atmosphere)

Select one:

a.
Composed mostly of the elements carbon and oxygen.


b.
Composed of molecules relatively far apart.


c.
Never contains water vapor.


d.
All of the above.

a) The reaction equation is; [tex]2Al + 6HCl ---- > 2AlCl_{3} + 3H_{2}[/tex]

b) The limiting reactant is Al

c) The percent yeild is 95%

We can say that a reaction has taken place when there is the combination of two or substances in such a way that what we get is a new product. In the case of this reaction the combination is between aluminum and hydrochloric acid.

Number of moles of Al = 700g/27 g/mol

=25.9 moles

Number of moles of HCl = 3000g/36.5 g/mol

=82.2 moles

We have that;

2 moles of Al reacts with 6 moles of HCl

25.9 moles of Al reacts with 25.9 * 6/2

=77.7 moles

Al is the limiting reactant.

If 2 moles of Al produces 2 moles of aluminum chloride then  we have the theoretical yield as 25.9 moles.

or 25.9 moles * 133 g/mol =3445 g

Thus the percent yield is;

3262g /3445 g  * 100/1

= 95%

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Answer:

Plant cells contain two organelles that are essential for their functioning. These are the chloroplasts and the vacuoles. The chloroplasts are the organelles responsible for photosynthesis, which involves converting light energy from the sun into chemical energy in the form of glucose. Without chloroplasts, plants would not be able to produce their own food. The vacuoles are large organelles filled with fluid that serve to store nutrients and other materials. Vacuoles also help to maintain the turgor pressure of the cell, which is the pressure that helps to keep the cell rigid and prevents it from collapsing. Without vacuoles, plant cells would not be able to remain rigid and would collapse, leading to the death of the plant.

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The volume of gas when the pressure is 45 psi is 2,833.33mL.

The volume of a substance can be calculated using Boyle's law equation as follows:

P₁V₁ = P₂V₂

Where;

According to this question, a tank of carbondioxide has a pressure of 850 psi and a volume of 150 mL. The volume can be calculated as follows:

850 × 150 = 45 × V

V = 127,500 ÷ 45

V = 2,833.33mL

Therefore, 2,833.33mL is the volume of the gas.

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Answer: 36 g

Explanation:

I watch tis video and he explain the question and the answer

The wavelength of the green light radiation that has a frequency of 6.26 x 10¹⁴ Hz is 4.8 x 10⁻⁷.

Given data :

As, c = ∧ v

So, ∧ = c / v

    ∧ = 3.00 x 10⁸ / 6.26 x 10¹⁴

    ∧ = 4.8 x 10⁻⁷    

Thus, the wavelength of the green light radiation that has a frequency of 6.26 x 10¹⁴ Hz is 4.8 x 10⁻⁷.

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AACGATC matches the strand AATGACT because it is the reverse complement of AATGACT.

In DNA, the nucleotides Adenine (A) always pairs with Thymine (T), and Cytosine (C) always pairs with Guanine (G) in the double helix structure.

By taking the reverse of a given DNA sequence and then replacing each base with its complement, you get the reverse complement of the original sequence.

So, in this case, AATGACT is the original sequence, by replacing A with T, T with A, G with C, and C with G we get the reverse complement of the sequence AACGATC.

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Answer: It is AACGATC

Energy, according to scientists, is the capacity for work. Because of the development of energy conversion technology, modern civilisation is feasible.

Calorie (cal) (cal). In more recent times, the calorie has been defined in terms of the joule; historically, this relationship has been referred to as the mechanical equivalent of heat. Joules is the energy unit used in the SI (J). The formula for joules is 1 kg*m2*s-2. The unit of energy known as a kilojoule (kJ) is 1000 joules.

The term "calorie" (Cal) refers to the amount of energy that is either contained in food or used by the body. A joule is equivalent to (roughly): the quantity of electricity needed to power a 1 W device for one second. the power necessary to move a 1 kg mass 1 m/s2 at a distance of 1 m. Nonrenewable and renewable energy sources can be divided into two categories.

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Object A moves with a positive constant acceleration. Object B moves with a positive constant acceleration but has a greater acceleration than Object A. The option A and B shows a velocity-time graph that represents this motion.

The term acceleration is defined as the rate of change of velocity. When an object transfer in a circular path at a constant speed, it is accelerating, because the direction of its velocity is changing.

Speed is a vector quantity as it is defined as the rate of change of velocity whereas the velocity is the rate of change of displacement. Acceleration is the rate of change of velocity. Velocity is a vector quantity because it made up of both magnitude and direction.

Thus, The option A and B shows a velocity-time graph that represents this motion.

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The value of  Kc for each reaction. b. CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) is Kp =[tex]7.7x10^24  mol^-1[/tex]

To calculate Kc for a reaction, we need to use the relationship between Kp and Kc, which is: Kc =[tex]Kp (RT)^(Δn)[/tex]

where R is the ideal gas constant, T is the temperature in Kelvin, and Δn is the change in the number of moles of gas in the reaction.

For the reaction: CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g)

Δn = (3 - 2) - (1 - 1) = 1

So, Kc =[tex]Kp (RT)^(Δn)[/tex]

At 298 K, R = 8.314 J/[tex]mol*K[/tex], so

Kc =[tex]7.7x10^24 (8.314 J/mol*K)(298 K)^1[/tex]

Kc = [tex]7.7x10^24 J/mol[/tex]

Since Kc is in Joules, we can convert it to an appropriate unit of concentration.

Kc=[tex]7.7x10^24 mol^-1[/tex]

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Kc ≈ 1.8 x 10⁻⁷ (at 298 K). It indicates a strong preference for the forward reaction, forming products, under the given conditions.

To calculate Kc for the given reaction, we need to use the relationship between Kc and Kp and the ideal gas law.

The relationship between Kc and Kp for a balanced chemical equation is:

[tex]Kp = Kc * (RT)^Δn[/tex]

Where:

Kp is the equilibrium constant in terms of partial pressures.

Kc is the equilibrium constant in terms of molar concentrations.

R is the ideal gas constant (8.314 J/(mol·K)).

T is the temperature in Kelvin.

Δn is the difference in the number of moles of gaseous products and gaseous reactants.

In the given reaction, Δn = (1 + 3) - (1 + 1) = 2.

Now, we can rearrange the equation to solve for Kc:

[tex]Kc = Kp / (RT)^Δn[/tex]

Given Kp = 7.7 x 10²⁴ and T = 298 K, and substituting the values, we get:

Kc ≈ (7.7 x 10²⁴) / [(8.314 J/(mol·K) * 298 K)²]

Kc ≈ 1.8 x 10⁻⁷

Thus, Kc for the reaction is approximately 1.8 x 10⁻⁷ at 298 K.

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Answer:

see attachment

Explanation:

see attachment for your answer.

Hope this helps.

-Rishabh

Mechanical waves are defined as they are waves that involve matter, rather than energy, moving from one place to another. Therefore, option A is correct.

An oscillation of matter known as a mechanical wave is what is responsible for the transmission of energy through a medium. There are two types of mechanical waves are: Longitudinal waves and Transverse waves.

The transmission medium sets a restriction on how far a wave can travel. In this instance, there is almost little translational motion and the oscillating material rotates around a fixed point.

Thus, option A is correct.

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The male scientists did not so much regard the study due to gender bias.

Gender biases refer to the systematic ways in which individuals and society tend to favor one gender over the other. These biases can manifest in many different ways, including in the workplace, education, healthcare, and politics.

It's important to note that these biases are not limited to men and women, and they can vary depending on the culture, community, and individual. Also, these biases are not limited to one gender, both men and women can hold biases towards the other gender. Gender biases can have a significant impact on individual's life, limiting their opportunities and opportunities for development.

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Answer:

Less favorably than .

Less important .

Explanation:

Answer:

Nitrogen fixation

Explanation:

In order for nitrogen to be available to make proteins, DNA and other biologically important compounds, it must first be converted into a chemical form. The process of converting N2 into biologically available nitrogen is called nitrogen fixation.

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In incomplete metamorphosis, an insect changes its appearance twice during its life cycle

The insect will hatch from an egg and start off as a nymph larva, which looks nothing like the adult.

An insect that undergoes incomplete metamorphosis first hatches from an egg and then passes through many nymphal stages.

When an insect undergoes partial metamorphosis, there is no full physical transformation, i.e., there is no pupal stage during the transition from an embryo to an adult form.

The pupa is the stage of an insect's development between the final larval instar and the adult, whereas the larva is the insect's immature form between the egg and pupa.

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If number of bonds is three (3) then bond angle is 120° and structure is trigonal and if number of bonds is four( 4) then bond angle will be 109° 28' and structure is tetrahedral.

The angle between two bonds in a complex molecule or between two orbitals that include bonding electron pairs encircling the core atom is the bond angle. It is calculated and represented in degrees using a spectroscopic method.

When a single electron pair there at central atom begins to resist the bound pair of electrons, the bond angle decreases and the bonds are slightly shifted inward. When there is a increase in back bonding, the bond angle increases.

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The quantity of things—which could include humans, animals, plants, or objects—in a given space is referred to as density.

The ability of matter, whether it be a solid, liquid, or gas, to fit into a particular space is referred to as density.

Or to put it another way, density is a property that enables us to calculate the mass contained in a given volume of a substance. Consequently, the formula for calculating density is the product of a body's mass and the volume it takes up:

Mass per unit volume of a material substance, or d = M/V density. Density is defined as d = M/V, where M stands for mass, and V for volume. The unit of density that is most frequently used is grammes per cubic centimetre.

In this instance, dense

Here, you are aware of:

mass= 62 g

volume=35 cm3 =35 mL.

Replacing "density" in the definition:

[tex]density $=\frac{62 \mathrm{~g}}{35 \mathrm{~cm}^3}=\frac{35 \mathrm{~g}}{35 \mathrm{~mL}}$[/tex]

[tex]density $=1.7^{\frac{\mathrm{g}}{\mathrm{cm}^3}}=1.7 \frac{\mathrm{g}}{\mathrm{mL}}$[/tex]

Therefore, the answer is [tex]$1.7^{\frac{\mathrm{g}}{\mathrm{cm}^3}}=1.7 \frac{\mathrm{g}}{\mathrm{mL}}$[/tex].

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Lewis structure is a type of shorthand notation that is used by chemists to represent the arrangement of electrons in a molecule.

What are Electrons?

Electrons are tiny subatomic particles with a negative electrical charge. They are the negatively charged components of atoms, and they are responsible for electrical conduction in most types of matter. Electrons are found in the space surrounding the nucleus of an atom and can move freely between atoms.

Step 1: Count the number of atoms in the molecule.

The molecule CH3CH2CH2CH2OH has 6 atoms: 1 Carbon (C), 4 Hydrogens (H), and 1 Oxygen (O).

Step 2: Assign each atom its valence electrons.

Carbon has 4 valence electrons

Hydrogen has 1 valence electron

Oxygen has 6 valence electrons

Step 3: Add up all the valence electrons.

The total number of valence electrons in CH3CH2CH2CH2OH is 4 + 4 + 1 + 1 + 6 = 16.

Hybridization is the process of combining two or more atomic orbitals to form a new set of hybrid orbitals. These hybrid orbitals can be used to explain the molecular geometry of a molecule and its chemical properties. For example, if two atomic orbitals of the same energy level are combined, the resulting hybrid orbital will be of a higher energy level than either of the two original orbitals.

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The surface area of the Lake Louise in square miles is 0.31 sq. miles

Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects.

To create a unit conversion issue where one (or more) units cancel out until just the desired unit is left, follow these steps:

The fundamental rule is to multiply when converting from a bigger unit to a smaller unit. Divide if you need to go from a smaller to a larger unit. You will reduce the number, and you are already aware that division is all about reducing numbers.

Given ,

2.59 sq kilometers is equivalent to 1 sq. mile

1 sq. kilometer = (1/2.59) sq. miles

0.8 sq kilometers is equivalent to (1/2.59)*0.8 = 0.31 sq miles

The surface area of the Lake Louise in square miles is 0.31 sq. miles

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The surface area of the Lake Louise in square miles is 0.31 sq. miles

Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects.

To create a unit conversion issue where one (or more) units cancel out until just the desired unit is left, follow these steps:

Find out what kind of unit you have.

Determine the desired unit.

Choose the proper unit conversion factor(s).

unit cancellation and math computations (e.g., multiply, divide).

The fundamental rule is to multiply when converting from a bigger unit to a smaller unit. Divide if you need to go from a smaller to a larger unit. You will reduce the number, and you are already aware that division is all about reducing numbers.

Given ,

2.59 sq kilometers is equivalent to 1 sq. mile

1 sq. kilometer = (1/2.59) sq. miles

0.8 sq kilometers is equivalent to (1/2.59)*0.8 = 0.31 sq miles

The surface area of the Lake Louise in square miles is 0.31 sq. miles

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There are 2 oxygen atoms in one mole of CO₂. Therefore, there will be 112 oxygen atoms in 56 moles of carbon dioxide.

Carbon dioxide is covalent compound exists in gaseous phase. This compound is formed through the sharing of electrons between carbon and oxygen atoms. Carbon dioxide is an essential gas to maintain the living condition in earth.

There are one carbon and 2 oxygen atoms in one mole of carbon dioxide. One mole of carbon dioxide contains 6.02× 10²³ carbon dioxide molecules.

The number of oxygen atoms in 56 moles of carbon dioxide = 2 × 56 = 112 atoms. Therefore, there are 112 oxygen atoms in 56 moles of carbon dioxide.

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Answer: 89.4 kJ

Explanation:

The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction. which expression can you use to find how many kilojoules of heat are produced when 3.40 mol Fe₂O₃ reacts with an excess of CO? ΔH = +26.3 kJ The amount of heat produced will be, 89.4 kJ

Hope this helps :D

The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction.

Which expression can you use to find how many kilojoules of heat are produced when 3.40 mol Fe₂O₃ reacts with an excess of CO. ΔH = +26.3 kJ The amount of heat produced will be, 89.4 kJ.

Chemical reactions with a negative H are known as exothermic reactions because they generate heat. Exothermic processes include those that include neutralization, the Haber process, thermite, and combustion.

An endothermic reaction is the opposite of an exothermic process. Endothermic reactions generate less heat than they take in from their surroundings. Exergonic and endergonic reactions are subtypes of exothermic and endothermic reactions, respectively.

Therefore, The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction.

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The difference between the numbers,

(2.260×104)−(8.098×103) = 598.539.

Subtraction is a mathematic operation. Which is used to remove terms or objects in an expression.

Given:

Two numbers,

(2.260×104) and (8.098×103).

First, we simplify the numbers,

(2.260×104) = 235.04

And  (8.098×103) = 833.579.

The difference between the numbers,

(2.260×104)−(8.098×103) = 833.579 - 235.04.

(2.260×104)−(8.098×103) = 598.539

Therefore, then value is 598.539.

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The steps of how plants get energy in the correct order is as follows:

Photosynthesis is the process by which plants and other photoautotrophs convert light energy into chemical energy.

Photosynthesis is carried out by the cells of green plants to synthesize their food in form of sugar powered by the energy from sunlight.

The cells in the leaf use the energy from the sun (light energy) and produce sugars (chemical energy). After which, the sugars are broken down to release energy for use by the cells in a process called cellular respiration.

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Answer:

I'm not really sure how but here's the formula?

To calculate theoretical yield first check chemical equations are balanced.  Calculate the mole ratios of the reactants and products, Find the theoretical yield of the reaction.

Percent Yield = Mass of Actual Yield / Mass of Theoretical Yield x 100 percent.

The theoretical yield is the quantity of product that stoichiometry predicts will be produced, whereas the actual yield is the amount that is actually produced.

The yield of a reaction is used to represent how much of a product is produced from that reaction.

Thus, Divide the ratio by the limiting reactant's molecular weight. The answer is the theoretical yield of the desired product in moles.

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Based on the kinetic theory of gases, scientists could infer from Robert Boyle’s Law that an inverse relationship exists between the pressure of gases and their volume if the temperature is kept constant because the decrease in the volume of the vessel containing the gases will result in less room for movement of the gases and hence, the frequency of collisions increases and subsequently the pressure of the gases will increase.

According to the kinetic theory of gases, a gas is made up of numerous submicroscopic particles (atoms or molecules), all of which are moving randomly and continuously. The container's walls and the quickly moving particles frequently collide in this situation resulting in the gas pressure.

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Radioisotope are emitted by Actinium-225 (Ac-225) . When it undergoes alpha decay, it emits a helium nucleus (alpha particle) and becomes a different element. The resulting daughter isotope is Thorium-221 (Th-221)

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Smoking direct wax in its raw form is harmful to one's health because it has numerous negative effects and can lead to a variety of health problems, including respiratory disease and cancer.

There are many implications of waxes, such as the fact that the wax is a hydrophobic material that does not dissolve easily in water and can be used for various products, such as in the cosmetic industry, but it is not recommended to smoke it in the raw as it can harm the lungs.

Hence, smoking direct wax in its raw form is harmful to one's health because it has numerous negative effects and can lead to a variety of health problems, including respiratory disease and cancer.

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Answer: hey sorry im late but i think this will help with ur answer

Osmosis is the diffusion of water molecules through a selectively permeable membrane, from an area of higher concentration to an area of lower concentration. In the context of water splitting, osmosis is needed to make the process more efficient because it helps to separate the hydrogen and oxygen ions that are produced during the process.

When the water is split into hydrogen and oxygen, the hydrogen ions and oxygen ions will tend to want to recombine because they have an electrostatic attraction towards each other. If they recombine, it would be difficult to separate them again. But by using osmosis, we can separate the hydrogen ions and oxygen ions by creating a selectively permeable membrane which only allows water molecules to pass through but not the hydrogen and oxygen ions. This way, we can keep the hydrogen and oxygen ions separate, and prevent them from recombining.

Additionally, water splitting process requires a high energy input to separate hydrogen and oxygen from water. Osmosis can be used to decrease the energy input required for water splitting by creating a concentration gradient. This is because the concentration gradient can be used to drive the water splitting reaction, allowing it to occur at lower energy inputs, making the process more efficient.

In summary, osmosis plays a crucial role in making water splitting work efficiently by providing a way to separate the hydrogen and oxygen ions produced during the process and by decreasing the energy input required for water splitting by creating a concentration gradient.

Explanation:

Because we obtain a significantly lower faradaic efficiency with saltwater, we are aware that it cannot be converted into hydrogen gas as effectively as pure water. Without osmosis, the Cl- in the saltwater produces side reactions that reduce the efficiency of water splitting.

What is Osmosis?

Osmosis is a passive process that doesn't require any energy to complete. In order for the concentrations on either side of the membrane to be equal, molecules must shift from an area of higher concentration to one of lower concentration.

Any solvent, including gases and supercritical liquids, can go through the osmosis process.

Let's take a closer look at the various forms and consequences of osmosis.

Osmosis is the process by which solvents migrate from an area of lower solute concentration to one of higher solute concentration through a semi-permeable membrane. Instead, in diffusion, molecules migrate from an area of higher concentration to one of lower concentration without the need for a semi-permeable membrane.

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Answer:

chloroplast, then ATP

Explanation:

because i did this before