A sample of oxygen occupied 626 mL when the pressure increased to 874.27 mm Hg. At constant temperature, what volume did the gas initially occupy when the pressure was 771.75 mm Hg?

Answer:

14.43 moles

Explanation:

I don't know... the interwebz said soz

Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Answer:

High conductivity

Explanation:

Metals exhibit high conductivity due to the mobility of valence electrons.

Answer:

I'm guessing the alimentary canal

In a 50 mM Phosphate buffer solution at a pH of 4.5, the phosphate molecules are expected to exist in their ionized forms, primarily as dihydrogen phosphate ions (H\(_{2}\)PO\(_{4}\)-) and hydrogen phosphate ions (HPO\(_{42}\)-).

At a pH of 4.5, the solution is slightly acidic. In an acidic environment, the phosphate buffer system maintains its pH by the equilibrium between the dihydrogen phosphate and hydrogen phosphate species. The dihydrogen phosphate ion acts as a weak acid, donating a proton (H+) to water to form a hydronium ion (H\(_{3}\)O+). This reaction can be represented as follows:

H\(_{2}\)PO\(_{4}\)-- + H\(_{2}\)O ↔ H\(_{3}\)O+ + HPO\(_{42}\)-

The hydrogen phosphate ion acts as a weak base, accepting a proton from water to form hydroxide ions (OH-). This reaction can be represented as follows:

HPO\(_{42}\)- + H\(_{2}\)O ↔ OH- + H\(_{2}\)PO-

The equilibrium between these two species allows the phosphate buffer system to resist changes in pH when small amounts of acid or base are added to the solution.

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The total molecular equation for the precipitation reaction between a solution of potassium carbonate and aqueous magnesium chloride is: K₂CO₃(aq) + MgCl₂ (aq) → MgCO₃ (s) + 2KCl (aq).

The spectator ions in this reaction are K+ and Cl-. The net ionic equation for the reaction is: Mg²+ (aq) + CO₃2- (aq) → MgCO₃ (s).

The reaction involves the precipitation of magnesium carbonate, which is the solid product of the reaction. This occurs when the anion of one reactant, carbonate, is combined with the cation of the other reactant, magnesium.

The spectator ions, which are ions that do not directly participate in the reaction, are K+ and Cl-, which come from the potassium carbonate and magnesium chloride, respectively. The net ionic equation shows the actual reaction taking place between the magnesium cation and the carbonate anion.

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The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

2 moles of MgCl2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

Mg + 2HCl —> MgCl2 + H2

Now, we can determine the number of mole MgCl2 produced from 4 moles of HCl as follow:

From the balanced equation above,

2 moles of HCl reacted to produce 1 mole of MgCl2.

Therefore, 4 moles of HCl will react to produce = (4 x 1)/2 = 2 moles of MgCl2.

Therefore, 2 moles of MgCl2 were produced from the reaction of 4 moles of HCl.

Answer:

500 moles

Explanation: moles=grams

The snack containing 10 g of carbohydrates, 2 g of protein, and 5 g of fat has a total of 93 calories.

To calculate the total number of calories in the snack, we need to consider the caloric content of each macronutrient (carbohydrates, proteins, and fats).

Carbohydrates: Carbohydrates provide 4 calories per gram. In this case, 10 g of carbohydrates would contribute 10 g * 4 calories/g = 40 calories.

Proteins: Proteins also provide 4 calories per gram. With 2 g of protein, we have 2 g * 4 calories/g = 8 calories.

Fats: Fats provide 9 calories per gram. For the 5 g of fat in the snack, we have 5 g * 9 calories/g = 45 calories.

Now, to find the total calories, we add up the calories from each macronutrient: 40 calories (carbohydrates) + 8 calories (protein) + 45 calories (fat) = 93 calories.

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Answer:

22g of  2

C

O

2

have  3.011×1023

3.011

×

10

23

  2

C

O

2

molecules.

Explanation:

Hope this helps! ^^

Answer:

B. NH4CI

Explanation:

Answer:

c

Explanation:

Answer:

C. formed by extreme heat and pressure

Explanation:

Answer:

Formic acid, citric acid, Oxalic acid, washing soda, baking soda, etc. can be some examples of natural acids and natural bases. They both have domestic, industrial, and various other purposes.

Explanation:

There are lots of natural acids present in our nature. Some of them are the following:

> Formic acid

 USE: It is used in the stimulation of oil and gas wells as it is less reactive towards the metal.

> Citric acid

 USE: It is considered as the best rust remover as it doesn't harm the metal just remove the rust.

> Oxalic acid

USE: It easily remove iron and ink stains and that's why it is used as an acid rinsing material in Laundries.

There is a variety of natural base found in our nature which founds a lot of uses in day to day life. some of them are the following:

> Washing soda

USE: It is used in commercial detergent mixture to treat hard water.

> Baking soda

USE: It is the best rising agent used mostly in cooking and for domestic purposes like removing stains, etc..

Answer:

d. oligomer it is the correct answer also if you would just search that up it pops up

We can make use of the correlation approach, T test, and linear regression techniques in this situation.

The two variables in this example of a eutrophic lake are temperature and dissolved oxygen, and both of these variables change over time. Therefore, a correlation test must be performed to see whether a relationship between these two variables exists. Here, the correlation coefficient value will be given to us, allowing us to calculate the linear relationship between these two variables.

Additionally, we can use the T test to determine whether or not the correlation between these two variables is strong enough to reject the null hypothesis.

Finally, we can also utilize the linear regression method to get a more accurate relationship between those two variables.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The instantaneous evaporation of liquid refrigerant in an evaporator is called flash gas

What is a flash gas?

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The wavelength of the electromagnetic radiation whose frequency is

6.94 x 10¹² Hz is 4.32 x 10⁻⁵ meters.

The electromagnetic spectrum is a set of frequencies, wavelengths, and photon energies ranging from less than one hertz to more than ten thousand hertz, with wavelengths ranging from a few kilometres to a fraction of the size of an atomic nucleus. In general, electromagnetic waves tend to move at speeds similar to light in a vacuum. They do so, however, at a wide variety of wavelengths, frequencies, and photon intensities.

The electromagnetic spectrum is a range of all electromagnetic radiation that is further divided into multiple subranges known as parts. They are further subdivided into infrared radiation, visible light, and ultraviolet radiation.

Speed of light = c = 3x10⁸ m/s

Frequency = ν = 6. 94 x 10¹² Hz

so in electromagnetic wave,

c = λν

λ = c/ν

= 3 x 10⁸ / 6.94 x 10¹²

λ = 4.32 x 10⁻⁵ meters.

Therefore, wavelength is 4.32 x 10⁻⁵ meters.

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The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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Answer:

Q = 5949.35 J

Explanation:

Given that,

The mass of water, m = 189.5 grams

Initial temperature, T = 16.4 °C

Final temperature, T' = 8.9°C

We need to find the thermal energy the water use to melt the ice cube. The thermal energy is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat of the water, c = 4.186 joule/gram °C

So,

\(Q=189.5\times 4.186 \times (8.9-16.4)\\Q=-5949.35\ J\)

So, the required amount heat is equal to 5949.35 J.

The three negative electrons that surround the lithium atom's nucleus, on the other hand, make it neutral.

The nucleus manages and regulates the operations of the cell, houses the genes and molecules that contain the genetic information (such as growth and metabolism). Inside the nucleus, nucleoli, which are tiny structures, are frequently found. The nuclear components appear to be suspended in a gel-like matrix called the nucleoplasm.

The nucleus is recognized as one of the most important parts of eukaryotic cells because of its function in the storage, recovery, or duplication of genetic information. It is an organelle that has two membranes connected to it and houses chromatin, a type of genetic material.

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If a worker who is 3.7 meters away from a natural gas leak starts smelling gas, it indicates that the methane gas has traveled at least 3.7 meters from the leak point.

The presence of mercaptan, which is added to natural gas as a smell indicator, allows the detection of the gas even at a distance. The exact distance the methane gas has traveled may depend on factors such as the concentration of mercaptan added, the wind direction, and the efficiency of gas dispersion.

Mercaptan is added to natural gas as a safety measure to make leaks easily detectable by smell. Methane gas itself is odorless and colorless, making it difficult to detect leaks without any added indicator. By adding mercaptan, which has a strong and distinct odor, any leakage can be quickly detected.

If a worker who is 3.7 meters away from the leak point starts smelling gas, it suggests that the methane gas has traveled at least 3.7 meters from the leak source. The smell of mercaptan indicates the presence of methane gas in the vicinity. However, it is important to note that the distance the gas has traveled may vary depending on several factors.

Factors such as the concentration of mercaptan added to the gas, the wind direction and speed, and the efficiency of gas dispersion will influence the extent of gas diffusion. Additionally, the sensitivity of an individual's sense of smell can also play a role in detecting the odor. Therefore, while the worker may start smelling gas at a certain distance, the exact distance the methane gas has traveled may vary based on these factors.

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The oxidized form of the molecule is quinone.

Oxidation has several definitions. Some of them are

In this case, quinone gained an electron from complex 1 to become quinol. Following the definition of oxidation as the loss of electrons, then we can say that the oxidized form of the molecule is quinone itself.

Immediate it gains an electron, it becomes reduced to quinol.

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- The atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

- The atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

The atmospheric pressure in Denver, Colorado, is usually about 84.0 kPa. To convert this pressure to atm and torr units, we can use the following conversion factors:

1 atm = 101.325 kPa

1 atm = 760 torr

First, let's convert 84.0 kPa to atm:

Pressure in atm = 84.0 kPa × (1 atm / 101.325 kPa) ≈ 0.829 atm

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

Next, let's convert 84.0 kPa to torr:

Pressure in torr = 84.0 kPa × (760 torr / 101.325 kPa) ≈ 627.522 torr

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

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The reaction between pottasium metal and chlorine gas is a combination reaction and it is as follows;

2K + Cl₂ → 2KCl

A chemical reaction is a process involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction is said to be a combination reaction when two or more atoms are joined together to form a compound. An example is the reaction of pottasium metal and chlorine gas to produce pottasium chloride as follows:

2K + Cl₂ → 2KCl

In the above equation, two elements; pottasium chemically combines with chlorine to form a compound; pottasium chloride.

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Cu(s) + Ni(NO3)2(aq) ⇒Ni(s) + Cu(NO3)2(aq)

The answer is option B.

Electrochemical or hobby series when the electrodes (metals and non-metals) in touch with their ions are organized on the idea of the values of their preferred discount potentials or standard oxidation potentials, the resulting series is called the electrochemical.

The electrochemical series is built up by means of arranging various redox equilibria so as of their fashionable electrode potentials (redox potentials). The maximum poor E° values are placed at the pinnacle of the electrochemical series, and the maximum wonderful at the lowest.

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