There are four 22.4 L fixed-volume containers at STP , filled with these gases: 1 mol CH4 , 2 mol H2 , 1 mol C2H5 , and 3 mol He. Which gas will exhibit the highest pressure

Answer:

A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)

Explanation:

a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid

Answer:

nitrogen in atmospheres of a sample is 0.679

A) A total of 24.89 g of zinc oxide will be produced if a 20-gram block of zinc were to completely oxidize.

B) A total of 3.91 gram of zinc is lost in the above process.

A) Using the following equation, we can calculate how much zinc oxide will be produced if a 20-gram block of zinc were to completely oxidize:2Zn + O₂ → 2ZnO

We know that 1 mole of zinc reacts with 1 mole of oxygen to produce 1 mole of zinc oxide. The molar mass of zinc is 65.38 g/mol, while the molar mass of zinc oxide is 81.39 g/mol.

To calculate how much zinc oxide will be produced from 20 g of zinc, we first need to convert 20 g of zinc to moles by dividing by the molar mass:20 g ÷ 65.38 g/mol = 0.306 moles of Zn

Since 1 mole of zinc reacts with 1 mole of oxygen, we know that there are also 0.306 moles of oxygen present.

Therefore, we can calculate the mass of zinc oxide produced by multiplying the number of moles of zinc oxide by its molar mass:0.306 moles of ZnO x 81.39 g/mol = 24.89 g of ZnO

B) If half the zinc were to corrode, the final mass of the block would be:20 g ÷ 2 = 10 g

Since half of the block has corroded, the other half will still be present. Therefore, the final mass of the block would be 10 g + the mass of the zinc oxide produced in part (A):10 g + 24.89 g = 34.89 g

Using the equation from (A), we can calculate the initial mass of zinc by subtracting the mass of the zinc oxide produced from the final mass of the block:-20.98 g +24.89 g = 3.91 g

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Answer:

A mixture of a weak acid and its conjugate base is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added.

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Mi inference about a  substance is described as being lipoid, would be that it has a chemical or physical resemblance to fats or lipids, which may come in its chemical structure or in its physical properties.

Lipids are described as a class of organic compounds that are insoluble in water but soluble in nonpolar solvents like ether or chloroform.

Lipids include fats, oils, waxes, phospholipids, and steroids, among others.

Their importance is seen in for energy storage, cell membrane structure, and signaling pathways in living organisms.

In conclusion,  a substance that is described as being lipoid may have some of the physical or chemical properties of lipids, such as being insoluble in water and soluble in nonpolar solvents, having a greasy or oily appearance or texture, or having a similar chemical structure to lipids.

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Answer:

gallium

Explanation:

it is the old melting in a hot cup of coffee spoon

Answer:

Elements That Are Liquid at 25°C

•Bromine

•mercury

Explanation:

The metal which exist as a liquid at room temperature is mercury.

Non-metal which exist as a liquid at room temperature is bromine.

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As a distant star moves away from earth, a. The wavelength becomes longer, and the energy decreases.

The distance between two successive crests or troughs of a wave is known as its wavelength. The direction of the wave is used to measure it.

The distance a wave travels between its crests or troughs is known as its wavelength (which may be an electromagnetic wave, a sound wave, or any other wave). The peak of the wave is called the crest, while the trough is its base. Because a wavelength represents a distance or length, it is expressed in length units like meters, centimeters, millimeters, nanometers, etc.

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The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

The initial mass of the radioisotope is calculated as follows;

N = N₀(¹/₂)^t/h

where;

24 M/s = N₀(¹/₂)^(22/32)

24 M/s = N₀(0.62)

N₀ = (24 M/s)/(0.62)

N₀ = 38.7 M/s

Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

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Answer:

biological

Explanation:

i took the test and got it right

Answer:

c2Na+2H 2 0 -2NASH +H 2

Explanation:

i think its wrong

In a chemical reaction, not all molecular collisions result in the formation of products. There are several factors that can prevent the formation of products in a reaction. Let's explore these factors:

1. "Collisions without sufficient kinetic energy": For a reaction to occur, molecules must collide with enough energy to overcome the activation energy barrier.
2. "Collisions between molecules with more energy than the minimum required": It is worth noting that collisions between molecules with excess energy can still lead to product formation, as long as the other conditions for successful collisions (sufficient kinetic energy and proper orientation) are met.

On the other hand, collisions with sufficient kinetic energy and the correct orientation are termed "effective collisions" and have the potential to result in the formation of products. To summarize, not all molecular collisions in a reaction lead to product formation. Only collisions with sufficient kinetic energy and the correct orientation have the potential to result in successful reactions and the formation of products.

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The pH of the resulting solution after adding a 10.0 mL portion of 0.010 M HCl to 100.0 mL of water is approximately 2.00.This pH value indicates the high concentration of H+ ions resulting from the complete dissociation of the strong acid, HCl, in water.

To calculate the pH of the resulting solution, we need to consider the dissociation of HCl in water. HCl is a strong acid that completely dissociates into H+ and Cl- ions in aqueous solution.

Given that the initial concentration of HCl is 0.010 M and the volume added is 10.0 mL, we can calculate the moles of HCl added:

Moles of HCl = concentration x volume

            = 0.010 M x 0.0100 L

            = 0.0001 moles

The total volume of the resulting solution is 100.0 mL + 10.0 mL = 110.0 mL = 0.110 L.

Since HCl is a strong acid, it completely dissociates, and the moles of H+ ions formed will be equal to the moles of HCl added.

Therefore, the concentration of H+ ions in the resulting solution is:

Concentration of H+ ions = moles of H+ ions / total volume

                       = 0.0001 moles / 0.110 L

                       = 0.000909 M

To calculate the pH, we use the equation:

pH = -log[H+]

pH = -log(0.000909)

   ≈ 2.00

Therefore, the pH of the resulting solution is approximately 2.00.

After adding a 10.0 mL portion of 0.010 M HCl to 100.0 mL of water, the resulting solution has a pH of approximately 2.00. This pH value indicates the high concentration of H+ ions resulting from the complete dissociation of the strong acid, HCl, in water.

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Answer:

True

Explanation:

Answer:

true

Explanation:

source(s): trust me bro

The CK levels were raised in the serum sample taken from the patient, indicating that there was muscle damage. This could have resulted from a crush injury to the thigh. Hence, option a) is correct.

Serum samples from patients are drawn in emergency rooms to check for their enzyme and protein levels, particularly to verify if they've had a heart attack.

CK, AST, and CK-MB are the most commonly used tests.

A crush injury to the thigh may account for these values. This is because a crush injury to the thigh can result in muscle damage and increased levels of creatine kinase (CK) in the blood.

The CK enzyme is found in skeletal muscle, cardiac muscle, and brain tissue. It can be released into the bloodstream as a result of muscular damage.

The CK levels were raised in the serum sample taken from the patient, indicating that there was muscle damage. This could have resulted from a crush injury to the thigh. Hence, option a) is correct.

Pulmonary infarction is caused by an obstruction in the pulmonary artery.

AST and CK-MB levels aren't affected by pulmonary infarction, so option c) is incorrect.

Cerebrovascular accident, on the other hand, is caused by an obstruction in the blood supply to the brain. It doesn't have an effect on CK, AST, and CK-MB levels, so option b) is incorrect. 

Early acute hepatitis, the final option, also doesn't have an effect on CK, AST, and CK-MB levels, so option d) is incorrect.

The correct option is a) crush injury to the thigh.

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A non-spontaneous process needs a steady stream of energy to function, whereas a spontaneous process happens on its own (possibly requiring an initial energy input).

The scenario described above can be viewed as:

(a) A satellite falls to Earth.

Non spontaneous ( the process is not occuring naturally and is happening due to constant force of earth gravity.)

(b) Water decomposes to H2 and O2‚ at 298 K and 1 atm.

Non-Spontaneous (Water breaks down into H and O through the electrolysis process, so it is not spontaneous.)

H2O -------------------> H2 + O2

(c) Average car prices increase.

Non-spontaneous (it will increase due to a number of factors in accordance with market price values)

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Answer:

The filter bed is cleaned by occasional backwashing ;-; im sorry if this isn't a great answer but I tried

The statement "physically, a 2D array is stored as a rectangular grid of columns and rows" is true. In computer memory, a 2D array is typically stored as a contiguous block of memory arranged in a rectangular grid of columns and rows.

Each element of the array occupies a specific memory location determined by its row and column indices. The elements are stored in a sequential manner, with consecutive elements belonging to the same row or column being stored next to each other.

This arrangement allows for efficient memory access and indexing based on the row and column coordinates.

By representing the 2D array as a rectangular grid, the physical storage reflects the logical structure of the array, facilitating easy manipulation and retrieval of data in a systematic manner.

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Answer:

fossil

Explanation:

ch 9 sorting material into groups

ch 10 change and reaction

ch 11 motion and measurement of distance

ch 12 electric current and circuits

ch 13 fun with magnet

ch 14 importance of air

ch 15 importance of water

ch 16 light, shadow and reflection

ch 17 wastes

Answer:

royal

Explanation:

royal is made of orange also

Answer:

Orange

Explanation:

it tastes lIke orange juice but with gas in it

The balanced chemical equation for the single replacement reaction of solid lithium and aqueous magnesium nitrate is:

2Li(s) + Mg(NO3)2(aq) → Mg(s) + 2LiNO3(aq)

From the equation, we can see that 2 moles of Li react with 1 mole of Mg(NO3)2 to produce 1 mole of Mg and 2 moles of LiNO3.

First, we need to determine the number of moles of Mg(NO3)2 in 75.0 grams:

m = mass / molar mass

m = 75.0 g / 148.31 g/mol

m = 0.5053 mol Mg(NO3)2

Since 2 moles of Li react with 1 mole of Mg(NO3)2, we need half as many moles of Li:

n(Li) = 0.5 x n(Mg(NO3)2)

n(Li) = 0.5 x 0.5053 mol

n(Li) = 0.2527 mol

Finally, we can calculate the mass of Li needed using its molar mass:

m(Li) = n(Li) x M(Li)

m(Li) = 0.2527 mol x 6.94 g/mol

m(Li) = 1.75 g

Therefore, 1.75 grams of lithium will combine with 75.0 grams of magnesium nitrate in this reaction.

Answer:

The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason

Explanation:

Explanation:

Since [H+] [OH-] =10^(-14)

[H+] = (10^-14) / (1.4×10^-10)

Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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To identify the cause of the problem with the liquid oxygen machine's reduced production and help ensure the Universal Space Agency can successfully launch their rocket to Titan within the specified launch window.

In order to determine the cause of the problem with the liquid oxygen machine producing less liquid oxygen than normal for the Universal Space Agency's rocket carrying a new surface lander to Titan, you need to follow these steps:

1. Check the production process: Start by examining the process of making liquid oxygen, which involves cooling and compressing gaseous oxygen until it liquefies. Ensure that the cooling and compression systems are working efficiently.

2. Inspect the machinery: Thoroughly inspect the liquid oxygen machine for any signs of wear and tear, malfunctioning components, or any other issues that could be affecting its performance.

3. Monitor input gas quality: Make sure that the quality of the gaseous oxygen being used in the production process is up to standard, as impurities or low-quality gas can affect the efficiency of the liquid oxygen production.

4. Verify operating conditions: Confirm that the machine is operating under the correct temperature and pressure conditions, as deviations from the optimal settings can reduce the efficiency of the liquid oxygen production.

5. Analyze production data: Review historical production data and compare it to the current performance of the machine to identify any patterns or discrepancies that might indicate a problem.

By following these steps, you should be able to identify the cause of the problem with the liquid oxygen machine's reduced production and help ensure the Universal Space Agency can successfully launch their rocket to Titan within the specified launch window.

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Answer:

Option C (6750 J) is the appropriate response.

Explanation:

The given values are:

Mass of iron,

m = 3 kg

Specific heat capacity,

\(c_A\) = 0.450

Temperature,

T = \(25-20\)

  = \(5^{\circ}C\)

Now,

⇒  \(Q=mc_A T\)

On substituting the values, we get

⇒      \(=3\times 0.450\times 5\)

⇒      \(=6.75\)

i.e,

⇒      \(=6750 \ J\)