¿Para qué sirve el proceso de disolución?

Answer:

Know this

1mole of a substance contains 6.022x10²³molecules

Now

8.55x10^-15moles x 6.022x10²³molecules/1mole

=5.15x10^9molecules.

Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.

Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.

When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.

One sodium and fluorine each totaling 2 atoms are enough to make the bond.

As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.

The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.

The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.

The name of the compound is sodium fluoride with formula NaF.

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Answer:

4 atoms of oxygen

Explanation:

2 atoms of oxygen gas O2

Answer:

4 atoms of oxygen

Explanation:

The given chemical formula is:

             2CO₂

Unknown is the number of atoms;

  There are :

C : 2 atoms of carbon

O: (2 x 2) atoms of oxygen in the given molecule

      4 atoms of oxygen

Answer: Gamma Rays

Explanation:

The waves with the highest frequency are Gamma Rays. These electromagnetic waves travel at a very high speed. Best of Luck to you!

Answer:

Atomic mass = proton + neutron

31+33= 64

Number of proton = Atomic number = 31

Charge of element is +3

Explanation:

Answer:

4.Current and static electricity

Explanation:

Answer:

Explanation:

meiosis

Haploid sperm and eggs are produced via meiosis.

The heat of solution is typically expressed in units of energy, such as joules (J) or calories (cal).

The most commonly used unit is joules, as it is part of the International System of Units (SI). The heat of solution can also be expressed in kilojoules (kJ) or megajoules (MJ), which are larger units of energy.

In older literature, heat of solution may be expressed in calories. One calorie is equivalent to 4.184 joules, so it is a smaller unit of energy than the joule. However, the use of calories in scientific literature has declined in favor of the joule.

Regardless of the units used, the heat of solution is a measure of the amount of heat absorbed or released during a chemical reaction, such as the dissolution of a solid in a liquid. A positive value for the heat of solution means that heat is absorbed during the reaction and the solution is endothermic. A negative value means that heat is released during the reaction and the solution is exothermic.

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Answer:

Zn2 + SO4 = Zn2(SO4)2

Explanation:

Answer:

23,900 joules

Explanation:

plato answer

Answer:

23,900 joules

Explanation:

Edmentum

The rate of the overall reaction is proportional to the concentrations of both NO2 and Cl2 raised to the first power.

The rate constant k represents the rate of the slow step and depends on the temperature and other conditions of the reaction.

The rate law for the overall reaction can be determined by identifying the rate-determining step, which is the slow step in the mechanism.

In this case, the slow step is the first step: NO2 + Cl2 → NO2Cl + Cl. The rate law for this step is Rate = k[NO2][Cl2].

Since the overall reaction involves two molecules of NO2 and one molecule of Cl2, we need to multiply the rate law of the slow step by the stoichiometric coefficients.

Thus, the rate law for the overall reaction is:

Rate = 2k[NO2][Cl2]

This means that the rate of the overall reaction is proportional to the concentrations of both NO2 and Cl2 raised to the first power.

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The question requires us to explain the differences in radii of neutral atoms, cations and anions.

To answer this question, we need to keep in mind that a neutral atom presents the same number of protons (positive particles) and electrons (negative particles). Another important information is that the protons are located in the nucleus of the atom, while the electrons are around the nucleus. Also, there is an electrostatic force between protons and electrons, which means that they the protons tend to attract the electrons to the nucleus.

While a neutral atom presents the same number of protons and electrons, a cation is an ion with positive charge, which means it has lost one or more electrons. In a cation, the balance between protons and electrons doesn't exist anymore: now, there is more positive than negative charge (more protons than electrons), and the overall attractive force that the protons have for the electrons is increased. As a result, the electrons stay closer to the nucleus and the radius of a cation is smaller than the neutral atom from which it was derived.

On the other side, anions present negative charge, which means they have received electrons. Similarly to cations, the balance between protons and electrons doesn't exist anymore, but in this case, there are more electrons than protons. In an anion, the overall attractive force that the protons have for the electrons is decreased. As a result, the electrons are "more free" to move and, as they are not so attracted to the nucleus, they tend to stay farther from the positive nucleus compared to the neutral atom - because of this, the radius of an anion is larger than the neutral atom from which it was derived.

When cooking an egg and waiting for coagulation, two things to look for are the firmness of the egg white and the doneness of the yolk.

The egg white should become opaque and set, indicating that it has coagulated properly. The yolk can be cooked to different degrees of doneness, depending on personal preference. For a runny yolk, it should still be soft and slightly jiggly in the center. For a firmer yolk, it should be more set and less jiggly. By observing these two aspects, you can determine the coagulation stage of the egg and achieve the desired texture for your egg dish.

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CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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Answer:

compound

Explanation:

The mass of CO2 that will be formed when 8.94 g O2 completely reacts would be 6.15 g

From the equation:

\(CH_4 + 2O_2 ---> CO_2 + 2H_2O\)

The mole ratio of O2 to CO2 is 2:1.

Mole of 8.94 g O2 = mass/molar mass

                               = 8.94/32

                                 = 0.28 moles

Equivalent mole of CO2 = 0.28/2

                                         = 0.14 moles

Mass of 0.14 moles CO2 = 0.14 x 44.01

                                          = 6.15 g

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Answer: Determination of Equilibrium Constant, Determination of Solubility Products, Determination of pH, Determination of Activity Coefficients,

Explanation:

Answer:

There is only one sub level in the first principal energy level, and it is 1s

Explanation:

trust

Water molecules that surround a less polar molecule in solution are immobile and ordered.

Water is good at dissolving ions and polar molecules, but it is poor at dissolving non-polar molecules. Water makes an excellent solvent because of its polarity and ability to form the hydrogen ions.

Polar molecules have the electric charges which are unequally distributed. Water forms the electrostatic interactions which are charge-based attractions with the other polar molecules and ions, due to its polarity.

Hydrogen carries a partial positive charge and oxygen with partial negative charge. Oxygen having partial negative charge  and hydrogen having partial positive charge results in the polarity of the molecule.

The less polar molecules and ions interact with the water, the partially positive and partially negative ends of water. The positive charges attracts negative charges, thus leading it to be immobile and ordered.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

none

Explanation:

It is given that there are 3 cats.

Each of the cats die with different diseases. One of cats died due to heart failure, the second cats died because of brain tumor and the third cat died due to an experiment gone wrong.

So there are none of the cats left out. All the cats died due to different reasons.

Our body goes to its second energy source by breaking down simple sugars called Monosaccharides.

Monosaccharides are also known as simple sugars. It is the simplest form of sugars that means they cannot be broken down by hydrolysis into simpler sugars. It is used as building blocks to form complex sugars.

Examples of Monosaccharides are Glucose, Fructose, Galactose etc.

The structure of Monosaccharides is (CH₂O)ₙ. It consist single unit chain. Monosaccharides used to store energy and produce energy.

Thus from the above conclusion we can say that Our body goes to its second energy source by breaking down simple sugars called Monosaccharides.

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An saturation pressure of each component in a gas mixture is the force that would occur is if gas alone covered the complete volume of the original mixture with the same temperature, partial pressure of 627.0c.

Helium was mostly commonly used to fill balloons for celebrations and parades since it is a secure, non-flammable gas. Helium, however, is an essential element in a variety of industries, including high-tech manufacturing, medical technology, space travel, and national security. Helium, the second most common element in the cosmos, is in little supply on Earth. It is the lightest gas, colorless, odorless, inert, and has a low boiling point. It is a byproduct from nuclear fusion and nuclear decay.

PV = nRT

=41.8*25.0*6.00

=627.0

A volume of 6.00 l at 25.0oc is 627.0c.

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Answer:

\(50ml=0,05l\\n_H_2SO_4=2.0,05=0,1mol\\mH_2SO_4=0,1.98=9,8g\)

Explanation:

Answer:

\(180^\circ\) by the VSEPR theory.

Explanation:

This question is asking for the bond angle of the \(\rm C=C=O\) bond in \(\rm H_2C=C=O\). The VSEPR (valence shell electron pair repulsion) theory could help. Start by considering: how many electron domains are there on the carbon atom between these two bond?

Note that "electron domains" refer to covalent bonds and lone pairs collectively.

For example, in \(\rm H_2C=C=O\), the carbon atom at the center of that \(\rm C=C=O\) bond has two electron domains:

In VSEPR theory, electron domains around an atom repel each other. As a result, they would spread out (in three dimensions) as far away from each other as possible. When there are only two electron domains around an atom, the two electron domains would form a straight line- with one domain on each side of the central atom. (To visualize, consider the three atoms in this \(\rm C=C=O\) bond as three spheres on a stick. The central \(\rm C\) atom would be between the other \(\rm C\) atom and the \(\rm O\) atom.)

This linear geometry corresponds to a bond angle of \(180^\circ\).

Answer:

weathering of existing rocks

If the pharmacy stocks 35% omeprazole suspension, it required 160 ml of the 35% omeprazole suspension for the dilution.

It is required to apply the idea of dilution equations to determine the quantity of 35% omeprazole suspension required for dilution.

Let C₁ be the concentration of the 8% omeprazole suspension (8%), and let V₁ be the volume of the 0.7 L 8% omeprazole suspension.

Let C₂ be the concentration of the 35% omeprazole suspension, and let V₂ be the volume of the 35% omeprazole suspension that we need to find.

The dilution equation states that the product of the starting volume and concentration (V₁ × C₁) and the end volume and concentration (V₂ × C₂) should be identical.

V₁ × C₁ = V₂ × C₂

Putting the given values:

0.7 L ×  8% = V₂  × 35%

0.056 L = V₂ × 35%

Dividing both sides by 0.35), get:

V₂ = 0.056 L / 0.35

V₂ = 0.16 L

Change 0.16 L to milliliters (ml):

0.16 L × 1000 ml/L = 160 ml

Thus, 160 ml of the 35% omeprazole suspension would be required for the dilution.

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According to the complementary base pairing in DNA, the  nitrogen base sequence  which is the partner of T-C-A-G-C-A is  A-G-T-C-G-T.

DNA  is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Answer:

A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. High heat and lower pressure at the base of the lithosphere (tectonic plate) facilitates melting of the rock. This melt, called magma, rises through cracks and erupts to form volcanoes.