The liquid level in a thermosyphon reboiler is mainly determined by the
a. Flow through the reboiler
b. Liquid level inside the tower
c. The diameter of the reboiler
d. None of the above

Answer:

The correct answer is 547

Answer:

Temporary in nature.

No new substance is formed.

Explanation:

Temporary in nature: Does not affect the internal structure of a substance, only the molecules are rearranged.

No new substance is formed: Most of the physical changes are reversible. We can obtain the substance back even after the change.

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Answer:

Taking into account the reaction stoichiometry, a mass of 448 grams of N₂ is formed when 48 moles of NaOH reacts.

In first place, the balanced reaction is:

2 NBr₃ + 3 NaOH  → N₂ + 3 NaBr + 3 HOBr

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 3 moles of NaOH form 28 grams of N₂, 48 moles of NaOH form how much mass of N₂?

mass of N₂= (48 moles of NaOH× 28 grams of N₂)÷ 3 moles of NaOH

mass of N₂= 448 grams

Finally, 448 grams of N₂ is formed.

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In muscle function at the sarcomere level, the regulation of cross-bridge formation is dependent on the binding of calcium ions to the protein troponin. Hence, the correct answer is B. calcium; troponin.

In muscle function at the sarcomere level, the formation of cross-bridges between actin and myosin filaments is regulated by the binding of calcium ions to troponin. Troponin is a regulatory protein complex that is associated with the actin filaments in the sarcomere. When calcium ions bind to specific binding sites on troponin, it causes a conformational change in the troponin-tropomyosin complex. This conformational change exposes the active sites on actin, allowing the myosin heads to bind to actin and form cross-bridges. This interaction between actin and myosin leads to muscle contraction.

Sodium ions do not directly regulate the formation of cross-bridges in muscle function. Tropomyosin is a structural protein that is involved in covering the binding sites on actin in the absence of calcium. However, it is the binding of calcium ions to troponin that initiates the conformational change in the troponin-tropomyosin complex, allowing the cross-bridge formation and muscle contraction to occur.

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I LOVE balancing chemical equations!

Answer:

2 Zn + 2 HCl -> 2 ZnCl + 1 H₂

Explanation:

These coefficients correct balance this equation.

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Answer: Halogens

Explanation:

Halogens include elements like Fluorine, Chlorine, Iodine and Bromine. These  elements can be dangerous to humans especially when used in large quantities.

When combined with other elements however, they can form very useful materials. Chlorine for instance forms salt when combined with sodium. Fluorine becomes very useful in toothpaste to protect teeth and bromine can be used in pesticides.

The adjacent nucleotides are bound to each other through a phosphodiester bond in a nucleic acid.

Nucleic acid is a biopolymer made up of nucleotide monomers that make up nucleic acid chains. The nucleotide's three components are a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleic acids are present in all living cells, including viruses and bacteria, and they play a critical role in storing, transmitting, and expressing genetic information. RNA and DNA are two types of nucleic acids.

The phosphate group in one nucleotide forms a phosphodiester bond with the hydroxyl group on the sugar molecule of the next nucleotide in line in nucleic acids. This reaction is carried out by removing a molecule of water, resulting in a strong covalent bond between two nucleotides. These bonds make up the sugar-phosphate backbone of a nucleic acid chain, which is fundamental to its structure.

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A system's equilibrium will move to the right, or toward the side of the products, in accordance with Le Chatelier's principle, if more reactants are added. ... The equilibrium will move to the left if we add more product to a system, producing more reactants.

Solution: By increasing the number of reactants, the equilibrium moves to the right and in the direction of the products.

Thus, if a reactant is added, equilibrium shifts to the right, away from the reactant. Equilibrium shifts to the left, away from the product, when a product is added. If we take away the product, equilibrium returns and produces the product. Reactant is created if reactant is removed, breaking the equilibrium.

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Answer:

red beryl

Explanation:

Red Beryls = Density range is 2.63g/cm3 to 2.92 g/cm3

Rubies = Density Range is 3.9 g/cm3 to 4.1 g/cm3

Mass of stone = 4.35 g

Volume of solid = change in water level = 1.5 mL = 1 cm3

Relationship between mass, volume and density is given by;

Density = Mass / Volume

Density = 4.35 / 1.5 = 2.9 g/cm3

The density of the stone falls in the red beryls range hence it is a red beryl.

The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Answer:

The seasons are a result of the tilt of the earth

Explanation:

14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll

(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH

Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:

(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)

= 0.541 L NaOH

This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.

15) 425 mL (0.425 L) of 0.105M HCl solution contains

(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl

so when enough water is added to 1L, the molarity becomes

0.0446 mol HCl/1 L = 0.0446M HCl

16) CaBr2 ---> Ca^+2 + 2Br^-1

For every Ca^+2 ion in the solution, you have 2 Br^-1 ions

If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is

[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L

17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.

The average atomic weight of silicon to be approximately 28.0855 amu, rounded to four significant figures.

To calculate the average atomic weight of silicon, we consider the natural abundance of each isotope and its corresponding atomic weight. By multiplying the abundance of each isotope by its atomic weight and summing up the values, we can obtain the average atomic weight of silicon.

We have three isotopes of silicon with their respective abundances and atomic weights:

Si-28 with 92.23% abundance and an atomic weight of 27.9769 amu.

Si-29 with 4.68% abundance and an atomic weight of 28.9765 amu.

Si-30 with 3.09% abundance and an atomic weight of 29.9738 amu.

To calculate the average atomic weight, we multiply the abundance of each isotope by its atomic weight and sum up the values:

Average atomic weight = (abundance of Si-28 * atomic weight of Si-28) + (abundance of Si-29 * atomic weight of Si-29) + (abundance of Si-30 * atomic weight of Si-30)

= (0.9223 * 27.9769) + (0.0468 * 28.9765) + (0.0309 * 29.9738)

Calculating this expression, we find the average atomic weight of silicon to be approximately 28.0855 amu, rounded to four significant figures.

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Answer:

option b is correct

..............

Answer:

it C not D btw

Explanation:

The number of dots would be found in the Lewis dot structure for the compound  \(C_{2} H_{3}Cl_{3}\)  is 32.

To determine the number of dots in the Lewis dot structure for the compound \(C_{2} H_{3} Cl_{3}\) , we first need to know the structure. In the Lewis dot structure, each hydrogen atom has two dots representing two valence electrons and each chlorine atom has six dots representing six valence electrons. The carbon atoms each have four dots representing four valence electrons on their own atoms, and one additional dot on the double bond between them. Therefore, the total number of dots in the Lewis dot structure for the compound \(C_{2} H_{3} Cl_{3}\)  is:
(2 x 4) + (3 x 2) + (3 x 6) = 8 + 6 + 18 = 32

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There would be 32 dots in the Lewis dot structure for the compound \(C_{2}H_{3}Cl_{3}\).

To determine the number of dots in the Lewis dot structure for the compound \(C_{2}H_{3}Cl_{3}\)., we need to calculate the total number of valence electrons for each element in the compound.

1. Identify the number of valence electrons for each element:
  - Carbon (C) has 4 valence electrons.
  - Hydrogen (H) has 1 valence electron.
  - Chlorine (Cl) has 7 valence electrons.

2. Calculate the total number of valence electrons in the compound:
  - There are 2 carbon atoms, so 2 * 4 = 8 valence electrons for carbon.
  - There are 3 hydrogen atoms, so 3 * 1 = 3 valence electrons for hydrogen.
  - There are 3 chlorine atoms, so 3 * 7 = 21 valence electrons for chlorine.

3. Add up the total number of valence electrons:
  - 8 (from carbon) + 3 (from hydrogen) + 21 (from chlorine) = 32 valence electrons.

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\(\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7-0}{0.1}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7}{0.1}\)

\(\\ \sf\longmapsto Acceleration=70m/s^2\)

In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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The correct answer is c. Iron. Red water problems are primarily caused by the presence of iron in the water, which can cause discoloration and an unpleasant taste and odor.

Iron Red water problems are primarily due to the presence of iron in the water. When iron is oxidized, it forms insoluble reddish-brown particles that can cause staining and other issues. Hardness refers to the concentration of dissolved minerals like calcium and magnesium in water, while turbidity refers to the cloudiness or haziness of water caused by suspended particles. Hydrogen sulfide is a gas that can cause a rotten egg odor in water.

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Answer:

The answer is in the explanation.

Explanation:

The KHP is an acid used as standard in titrations to find concentration of bases as NaOH.

The reaction that explain this use is:

KHP + NaOH → KNaP + H2O

where 1 mole of KHP reacts per mole of NaOH

That means, at equivalence point of a titration in which titrant is NaOH, the moles of KHP = Moles of NaOH added

With the moles of KHP = Moles of NaOH and the volume used by titrant we can find the molar concentration of NaOH.

The moles of KHP are obtained from the volume and the concentration as follows:

Volume(L)*Concentration (Molarity,M) = moles of KHP

If the concentration is more or less than 0.100M, the moles will be higher or lower. For that reason, we need to know the concentration of KHP but is not necessary to be 0.100M.

Answer: A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction. The numbers in a conversion factor come from the coefficients of the balanced chemical equation

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Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.

Explanation:

Answer

The theoretical Van't Hoff factor i for C12H22O11 is 1

Explanation

The Van't Hoff factor, i, is the number of particles formed in a solution from one formula unit of solute.

The Van't Hoff factor, i, is a property of the solute. In an ideal solution, i does not depend on the concentration of the solution.

For a nonelectrolyte, like (C12H22O11), which does not separate into ions in solution, Van''t Hoff factor, i = 1 because 1 molecule of sucrose (C12H22O11) forms only one particle in solution.f

Each element is made up of only one kind of atom.

what is an element?

An element is a pure material composed of only one type of atom; it cannot be broken down further.

example- diamond and graphite are only made up of carbon atoms.

what is an atom?

An atom is a matter particle that specifies a chemical element uniquely. An atom is made up of a central nucleus and one or more negatively charged electrons. The nucleus is positively charged and contains one or more protons and neutrons, which are relatively heavy particles.

Each element is made up of only one kind of atom.

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This relationship between pressure and volume is known as Boyle’s law. A law that states that at constant temperature, the volume of a fixed amount of a gas is inversely proportional to its pressure., after its discoverer, and can be stated as follows: At constant temperature, the volume of a fixed amount of a gas is inversely proportional to its pressure.

Answer:

solids have definite shape and definite volume

Answer: NUmber 3

Explanation:

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