Describe the proper use of filter paper in vacuum filtration...

Answer:

hydrogen bond are found between nucleotides

Answer:

SeCl6

this is the correct formula.

The correct formula for selenium hexachloride is SeCl₆.

What is selenium hexachloride

Selenium hexachloride is a compound composed of one selenium atom (Se) and six chlorine atoms (Cl). The prefix "hexa-" indicates that there are six chlorine atoms bonded to the selenium atom.

The chemical formula SeCl₆ represents the composition of selenium hexachloride, indicating that there are six chlorine atoms bonded to one selenium atom.

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The concentration of the solution in g per dm cube is 35.24 g/dm cube.

The amount of sand in grams is 0.2 g and the volume of the solution is two-thirds of a litre. We have to find the concentration of the solution in g per dm cube.To find the concentration of the solution in g per dm cube, we need to know the concentration of ethanol. As the concentration of ethanol is not given in the question, let us assume the concentration of ethanol is 100%. Therefore, the volume of ethanol in the solution is

(1 - 2/3) litres= 1/3 litres= 1000/3 mL.

As the density of ethanol is 0.789 g/mL,

the mass of ethanol in the solution is:

0.789 g/mL × 1000/3 mL= 789/3 g

The mass of the solution is:

789/3 g + 0.2 g= 2367/9 g

The volume of the solution in dm cube is:

2/3 L= 0.67 dm cube

The concentration of the solution in g per dm cube is: (2367/9 g)/(0.67 dm cube)≈ 35.24 g/dm cube.

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Answer:

Ground state electronic configuration of nitrogen atom can be represented by 1, 4 only. All the unpaired electrons have spins aligned in the same direction only.

Explanation:

According to the research, the correct option is metal zinc. Hydrogen can be produced by reaction of cold water with metal zinc.

It is an abundant metal in the earth's crust, white and shiny, which can appear in the form of silicate, sulfide or carbonate.

This metal can be reused for the production of biofuel such as hydrogen whose hydrogen production is generated from different methods based on fuel processing and non-reforming technologies and from chemical reactions that consists of adding cold water to a metal.

Therefore, we can conclude that according to the research, the correct option is metal zinc. Hydrogen can be produced by reaction of cold water with metal zinc.

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Answer:

Thermal, is mainly the heat trapped or in an object, such as a boiling water over a stove, its trapped and countinues to get hotter

Heat is basically the releasing of the energy that is contained in an object.

Thermal is the objects temperature, while heat is the Thermal energy that is released.

Explanation:

Answer:

The limiting reagent is FeBr3.

Explanation:

from the reaction, you find a ratio between FeBr3 and Fe2(CrO4)3.

This ratio is 2 moles of FeBr3 reacts and forms 1 mole of Fe2(CrO4)3.

Transform 30 g of FeBr3 in grams:

30 / 296.6 = 0.10 mole

Transform 20.3 g of Fe2(CrO4)3 in grams:

20.3 / 459.7 = 0.0442

You have an excess of Fe2(CrO4)3, the limiting reagent is FeBr3.

Answer:

About 0.783

Explanation:

Answer:

0.7830 mol

Explanation:

Just divide by the molar mass, which is 16.04 g/mol. That will take away grams so youre left with moles and your answer will be .783042. Using significant figures (4) so it will be 0.7830.

Answer:

the second one

Explanation:

becuase i asked my teacher

Answer:this ? 2end one

Explanation:

The pH of a 0.0015 M solution of HBr is 2.82 hence the correct option is a. 2.82

The pH is a measure of the concentration of hydrogen ions (H+) in a solution. The pH can either be highly acidic, weakly acidic, strongly basic, weakly basic or neutral.The pH of a solution can be calculated using the formula:

pH = -log[H+]

In this case, the concentration of hydrogen ions is the same as the concentration of HBr, since HBr is a strong acid and completely dissociates in water to produce H+ and Br- ions. Therefore:

pH = -log[0.0015]
pH = -(-2.82)
pH = 2.82

The correct option to the answer is therefore option a. 2.82

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Answer:

Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Explanation:

He holds a marshmallow on a metal skewer over a fire. A few seconds late, the marshmallow is cooked and the skewer feels warm.

The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

The term thermal energy refers to a form of energy that exists as a result of the temperature difference between two bodies. Thermal energy will always flow from the hotter to the cooler body.

Hence, the marshmallow is cooked and the skewer feels warm shortly after because the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

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An existing ecosystem can suffer from damage from invasive species in many different ways, such as shifting habitats and depriving native creatures of food and resources.

An invasive species is an organism that damages the environment or the economy in a new location in which it is not native. Invasive species may disrupt the food chain of a ecosystem by killing or substituting natural food sources. The invasive species could provide little to no food value to wildlife.

Accidental introduction of invasive species into a new area is common. In Central Asia, the Black Sea and the Caspian Sea are home to zebra mussels. Zebra mussels accidently made their way to the Great Lakes of North America after becoming affixed to massive ships that sailed between the two areas.

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Answer:

Intramolecular forces are the forces that hold atoms together within a molecule. Intermolecular forces are forces that exist between molecules.The stronger the intermolecular forces between solute molecule and solvent molecule, the greater the solubility of the solute in the solvent.

Intermolecular and intramolecular forces determine the solubility of solutes in water. As the polar solute dissolves in a polar solvent and nonpolar dissolves in nonpolar.

Intermolecular forces can be defined as the attractive forces and repulsive forces that develop between the molecules of a substance. These forces decide most of the chemical properties and physical properties of matter. The intermolecular forces between the molecules are known as Vander Waals forces.

Forces between the molecules themselves are known as intermolecular forces. The particles are held together by intermolecular forces while forces present within one molecule are known as intramolecular forces.

The intermolecular forces can be described as Dipole-Dipole Interactions, Ion-Dipole, Ion-Induced Dipole, Dipole-Induced Dipole Interactions, and Dispersion Forces.

Polar solute shows attractive intermolecular forces for polar solvents while nonpolar solute dissolves in nonpolar solvents. Intermolecular forces help dissolving solutes in water.

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Answer:

Ni^2+

Explanation:

The following data were obtained from the question:

Proton = 28

Electron = 26

Neutron = 34

Next, we shall determine the atomic number of the element.

Atomic number of an element is simply defined as the number of protons in the atom of an element.

Thus,

Atomic number = proton number

Proton = 28

Atomic number = proton number = 28

Atomic number = 28

Therefore, the element is Nickel since no two elements have the same atomic number.

Finally, we shall determine the charge on the Nickel atom as follow:

Proton = 28

Electron = 26

Charge on atom =

Charge on atom = Proton – Electron

Charge on atom = 28 – 26

Charge on atom = +2

Therefore, we can represent the Particle as Ni^2+

Answer:

can only accommodate 2 electrons

The number of nanomoles of acetylcholine in the original 12 ml sample is 2676.6.

Based on the given information, we can assume that the decrease in pH is due to the dissociation of acetic acid into acetate and hydrogen ions. Since there was no buffer in the assay mixture, the pH change indicates that the sample is not able to resist changes in acidity.

To determine the number of nanomoles of acetylcholine in the original 12 ml sample, we can use the following steps:

1. Calculate the change in hydrogen ion concentration:
Δ[H⁺] = 10^(pH₂ - pH₁) = 10^(6.78 - 7.63) = 0.223

2. Since acetic acid dissociates to yield one hydrogen ion, we can calculate the concentration of acetic acid in the sample:
[HAc] = Δ[H⁺] = 0.223 M

3. We can then use the balanced equation for the conversion of acetylcholine to choline and acetic acid:
Acetylcholine + H₂O → Choline + Acetic acid

Since all the acetylcholine is converted to acetic acid, we can assume that the initial concentration of acetylcholine is equal to the final concentration of acetic acid:
[Acetylcholine] = [HAc] = 0.223 M

4. To convert the concentration to nanomoles, we can use the formula:
n = C x V x 10^9
where n is the number of nanomoles, C is the concentration in M, and V is the volume in liters.

Since the volume of the sample is 12 ml or 0.012 L, we can calculate the number of nanomoles of acetylcholine in the sample:
n = 0.223 x 0.012 x 10^9 = 2676.6 nanomoles

Therefore, there were 2676.6 nanomoles of acetylcholine in the original 12 ml sample.

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When dye changes its solid state to a liquid state is called melting.

What do you understand by melting point?

The melting point is the temperature at which the solid transforms into liquid under atmospheric pressure.

When any solid whether it is a dye or any other chemical substance in a solid state subjected to high heat, the framework of the bonds within the dye becomes weakens and starts breaking down. So, it converted into a less uniform state which is called liquid or solution.

Hence, the whole procedure is called melting

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Answer: 0.002 m³

Explanation:

We can use our unit conversions to find the volume in m³.

\(2L*\frac{1m^3}{1000L} =0.002m^3\)

Answer:

Explanation:

Niacin

If you attempt to connect to another computer using an MMC snap-in without the appropriate level of permissions on the target computer, b. the snap-in will load but you will not be able to read information from or modify settings on the target computer.

This is because MMC snap-ins require the appropriate level of permission to access and modify information on a target computer. Without these permissions, the snap-in will not have the necessary access to read or modify information on the target computer.
It is important to note that some snap-ins may require you to provide appropriate credentials in order to gain the necessary permissions to access and modify information on the target computer. In such cases, the snap-in will load, but you will be prompted to provide the appropriate credentials before being able to access and modify the information on the target computer.
In summary, attempting to connect to another computer using an MMC snap-in without the appropriate level of permissions will result in the snap-in loading, but not being able to access or modify information on the target computer. The snap-in may require you to provide appropriate credentials to gain the necessary permissions to access and modify information on the target computer.

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This question involves the concept of binding energy.

The amount of energy released by this reaction is "a) 1.22 x 10¹³ m/s".

The amount of energy that is released during the radioactive decay of any element is known as binding energy. This can be given by using the following formula:

\(E=\Delta mc^2\)

where,

Therefore,

E = (1.35 x 10⁻⁴ kg)(3 x 10⁸ m/s)²

E = 1.22 x 10¹³ m/s

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Answer:

312140 LB/CU FT

Explanation:

MULTIPLY

The hydrocarbons in the petroleum that are separated into the fractions is by the fractional distillation method.

The Petroleum will be separated into the fractions through the  process called as the fractional distillation. The  Petroleum is heated in  the distillation tower, and making the hydrocarbons will vaporize. The highest temperature is present at the bottom in the distillation tower, and  the lowest temperature is present at the top of the distillation tower.

Therefore at the different heights in the distillation tower, the different temperatures will be present. The vaporized hydrocarbons will rise through the tower and will condense as  the temperature will be decreases.

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When ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty), the denser water will sink to the bottom and the less dense water will rise to the top. This is known as stratification, and it helps to create distinct layers in the ocean.

This stratification can create an environment that is more conducive to life, as it allows different types of organisms to inhabit different layers of the ocean.

The different layers of the ocean created by stratification play a significant role in the global climate system. Colder, denser waters are usually found at the bottom of the ocean, while warmer, less dense waters are found near the surface.

This temperature difference creates a natural convection system that drives currents throughout the ocean, which helps to regulate temperatures on a global scale. Additionally, stratification can also affect the amount of oxygen in the ocean.

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The bond or the force would not expect to occur in the absence of the water is the hydrophobic clustering.

The Hydrophobic clustering is the tendency of the nonpolar substances, like oils and the fats, to aggregate together and to avoid the contact with water. This is because of the water molecules are the polar,  they have a positive charge at one end and the negative charge at the other end.

In the absence of the water, there would be no polar and the nonpolar interactions and thus no hydrophobic clustering. However, Other forces like polar covalent bond, the hydrogen bonds and the nonpolar covalent bond could still occur.

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The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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