Tính giá trị của các nguyên tố trông các công thức : H2S.NO2.Al2o3

Answer:

C

Explanation:

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

The relationship is predation. The ladybugs are the predators and the aphids are the prey.

Predation is an interaction in which one organism, the predator, eats all or part of the body of another organism, the prey.

As per the information in the question, Ladybug beetles chase, capture, and eat smaller insects called aphids.This means that aphids act as food sources for Ladybug beetles.

Predation can be described as a biological interaction between two organisms belonging to two different species where one organism ( called predator) captures and consumes/eats another organism ( that is called prey).

Here, Ladybug beetles ( that capture and eat small insects) are predators and the insects are prey.

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Basic concepts of democracy are  freedom of assembly, association, property rights, freedom of religion and speech, inclusiveness and equality.

Democracy is a form of government in which the people have the authority to deliberate and decide legislation ("direct democracy"), or to choose governing officials to do so ("representative democracy"). Who is considered part of "the people" and how authority is shared among or delegated by the people has changed over time and at different rates in different countries.

Features of democracy often include freedom of assembly, association, property rights, freedom of religion and speech, inclusiveness and equality, citizenship, consent of the governed, voting rights, freedom from unwarranted governmental deprivation of the right to life and liberty, and minority rights.

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Answer:

the branch of science that deals with the identification of the substances of which matter is composed. the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

Explanation:

Answer:

granulated sugar

Explanation:

the rate of dissolving can be increased by mixing stirring and agitating the

solution. hope this answers your question

Answer:

High spec heat cap

Explanation:

Specific heat =   Q/(m *Tchange)

re-arrange to

Tchange =  Heat/(m *spec heat)

   this shows that a high  spec heat (in the denominator) will require a lot of heat (in the numerator) to change the Temp much  

To answer this question, we need to start by writing out the balanced chemical equation for the reaction between mno3 and oxygen:

2 MNO3 + 3 O2 -> 2 MN2O7

This equation tells us that for every 3 moles of oxygen that react, 2 moles of mno3 are produced. To find out how many moles of mno3 are produced when 4.30 kg of oxygen gas reacts, we need to first convert the mass of oxygen into moles using its molar mass:

1 mole of O2 = 32 g
4.30 kg = 4,300 g
4,300 g / 32 g/mol = 134.4 mol of O2

Now that we know the number of moles of oxygen, we can use the stoichiometry of the balanced equation to find the number of moles of mno3 produced:

3 moles of O2 : 2 moles of MNO3
134.4 moles of O2 : x moles of MNO3

x = (2/3) * 134.4
x = 89.6 moles of MNO3

Therefore, 89.6 moles of mno3 are produced when 4.30 kg of oxygen gas completely reacts according to the balanced chemical reaction.

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Peroxides species shows the correct charge of the oxide ion.

As predicted by the two partially filled outer orbitals, oxygen assumes a negative oxidation state in all of its molecules. The oxide ion O2 is produced when electron transport fills these orbitals. It is thought that each oxygen in peroxides (species that contain the ion O2 2) has a charge of 1.

The carbon and hydrogen atoms have a slight positive charge, while the oxygen atom has a slight negative charge.

There are six valence electrons in the atom of oxygen. The oxygen atom requires two additional electrons in order to complete its valence shell. Adding two more electrons gives the oxygen ion a charge of two because each electron has a single negative charge.

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Bulky substituents prefer to occupy the equatorial position in the cyclohexane chair conformation, since the substituent has more space because bulky substituents have a large steric hindrance effect on the adjacent substituents; thus, they favor occupying certain locations in the cyclohexane conformation to minimize this effect.

When bulky groups are placed in the axial position of the cyclohexane chair, they are adjacent to the hydrogens in the same axial orientation and to the carbons in the opposite axial orientation. Due to the steric hindrance effect, this position is less stable than the equatorial position.

In contrast, bulky substituents prefer the equatorial location in the cyclohexane chair conformation because it has more space. This is due to the fact that it has more space than the axial location, where the steric hindrance effect is larger and may lead to unfavourable interactions between the bulky group and other substituents. The equatorial position is also closer to the average plane of the cyclohexane chair, which is ideal for minimizing the steric interactions.

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Answer: I belive it is HH to h-c-n

Explanation: yea

The solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

The solubility product denoted as Ks, of an ionic compound is defined as the product of the concentration of the ions that exist in equilibrium with the solid compound in a saturated solution.

The balanced chemical equation is given as,

Ag₂CrO₄ ⇌ 2Ag⁺ + CrO₄²⁻

Thus,

[Ag⁺] = 2 [CrO₄²⁻]

By using the formula of Ksp we get,

Ksp = [Ag⁺] [CrO₄²⁻]

⇒ Ksp =  2 [CrO₄²⁻]  [CrO₄²⁻]

⇒ Ksp = 2 [CrO₄²⁻]²

Substituting the values of Ksp we get,

2.76 x 10⁻¹² = 2 [CrO₄²⁻]²

⇒ [CrO₄²⁻]² = 2.76 x 10⁻¹² /2

⇒ [CrO₄²⁻]² = 1.38  x 10⁻¹²

⇒ [CrO₄²⁻] = 1.17  x 10⁻¹²

Hence, the solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

​

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The new volume of the hydrogen gas at s.t.p., \(V_{2}\) = 750 dm³

The molar volume of a gas at s.t.p. is 22.4 dm³.

The change in volume gases at different temperatures and pressures are given by the general gas equation given below:

\(V_{1}\) = 600 dm³

\(P_{1}\) = 950mmHg

\(T_{1}\)= 273 K

The new volume of the hydrogen gas at s.t.p., \(V_{2}\) is calculated thus:

\(V_{2}\) = (950 x 600 x 273)/(760 x 273) = 750 dm³

In conclusion, the volume of a gas changes with temperature and pressure changes.

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A non-reducing disaccharide is formed when a glycosidic bond occurs between two monosaccharides, both of which are in the ketose form. Specifically, a glycosidic bond between two ketose monosaccharides in the α-anomeric form would yield a non-reducing disaccharide.

In the α-anomeric form of a ketose, the anomeric carbon (the carbon involved in the glycosidic bond formation) is in the α configuration. The α configuration means that the hydroxyl group attached to the anomeric carbon is pointing downward. When two α-ketose monosaccharides are linked together through a glycosidic bond, the resulting disaccharide is non-reducing because the anomeric carbon of both monosaccharides is involved in the glycosidic bond and cannot undergo mutarotation.

In contrast, if the glycosidic bond occurs between a ketose and an aldose (such as a ketose and a glucose), or between a ketose and the reducing end of another carbohydrate molecule, the resulting disaccharide would be a reducing disaccharide because the anomeric carbon of the reducing monosaccharide can still undergo mutarotation and reduce other compounds.

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Answer:

The loss of crystalline structure of sucrose was reported at various temperatures, but decomposition, after >50 h of holding at 120 °C in a sealed pan.

Explanation:

As this condition is above the melting temperature of fructose (a possible first decomposition product), and there were water and impurities.

Answer:

4170 j

Explanation:

water has low melting point

Answer:

the answer is d because without each other the cells will die because the body won't get it's job down properly.

Answer:

Hi numu !

How are you .

:D

Hope you have nice time

Answer:

D

Explanation:

because they need it and hii

Answer: Apple

Explanation:
just took the test

Crystals impurities are expected to have high solubility in cold solvents. Hence, option C is correct.

Cold solvent cleaning is a process used to remove grease, wax and other impurities from metal and other parts.

The process is also called degreasing. Cold solvents are sprayed onto the dirty part and it is brushed clean.

Once the filtration process is done the collected crystals should be washed with a little more ice-cold solvent to remove final soluble impurities which would otherwise be left on the surface of the crystals.

Hence, option C is correct.

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Explanation:

Ions form when atoms gain or lose electrons. This is so that they form a full outer shell of electrons. When an atom gains electrons it becomes a negative ion, because electrons are negatively charged. For example, all halogens (group 7 or 17) form negative ions as they gain an electron forming a 1- charge. When an atom loses electrons it becomes a positive ion, as it is losing some negative charge from the electrons. This would be for example, alkali metals (group 1) which lose an electron to form a positive ion with a 1+ charge, (ALL metals form positive ions).

Answer:

Butter melts.

Explanation:

Answer:

Mass = 234 g

Explanation:

Given data:

Mass of NaCl produced = ?

Moles of chlorine = 2.0 mol

Solution:

Chemical equation:

2Na + Cl₂    →     2NaCl

now we will compare the moles of NaCl with chlorine gas.

           Cl₂           :          NaCl

             1            :           2

            2.0         :         2/1×2.0 = 4.0 mol

Mass of NaCl;

Mass = number of moles × molar mass

Mass = 4.0 mol × 58.5 g/mol

Mass = 234 g

Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. So, the correct option is C, attraction. This is because opposite magnetic poles attract each other, while like magnetic poles repel each other.

A magnetic field is a region in space where a magnetic force can be detected. It is created by the movement of charged particles, such as electrons, protons, and ions. A magnetic field can be produced by a magnet, an electric current, or a changing electric field.

When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. This is because the magnetic field lines of the two magnets interact in such a way that they try to align with each other. Since opposite magnetic poles attract each other, the North Pole of one magnet will be attracted to the South Pole of the other magnet.

The magnetic force between the two magnets depends on the strength of the magnetic field and the distance between the magnets. The closer the magnets are, the stronger the magnetic force will be.

Therefore option C, attraction is correct.

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Answer

No you did not lose weight.

Explanation:

Weight is the force acting on an object, Gravity is a force on earth which does not apply to the moon so your weight may change depending in where you are but your mass will stay the same because mass measures the matter of an object ITSELF! Have a nice day....

Answer:

I would take my weight on Earth and divide it by  6. I'd weigh less because the gravitational pull on the Moon is less, and, weight is the measure of gravitational pull. I wouldn't "loose weight" because I'd weigh the same on Earth  as I did the day I left (give or take a few pounds).

Explanation:

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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To tackle this issue, we can utilize the connection between the convergences of the corrosive, the form base, and the separation steady:

Ka = [H+][OCN-]/[HOCN]

We know that the pH of the solution is 2.77, which means that the concentration of H+ is:

[H+] = 10^(-pH) = 10^(-2.77) = 1.83 x\(10^(-3)\)M

We also know that the initial concentration of HOCN is 1.00 x \(10^(-2)\)M and that at equilibrium, some of the HOCN will dissociate into H+ and OCN-. Let x be the concentration of H+ and OCN- that are formed at equilibrium, so:

[HOCN] = (1.00 x \(10^(-2)\)- x)

[OCN-] = x

Substituting these expressions into the equilibrium expression for Ka, we get:

Ka = [H+][OCN-]/[HOCN]

= (1.83 x \(10^(-3))\) (x) / (1.00 x \(10^(-2)\) - x)

We can assume that x << 1.00 x \(10^(-2)\)since the dissociation is relatively small.

Therefore, we can make the approximation that (1.00 x \(10^(-2)\)- x) ≈ 1.00 x \(10^(-2).\) This allows us to simplify the expression for Ka:

Ka ≈ (1.83 x 10^(-3)) (x) / (1.00 x \(10^(-2))\)

= 1.83 x \(10^(-4)\) x

Now we need to find x. We can use the equation for the dissociation constant of a weak acid:

Ka = [H+][OCN-]/[HOCN] = \(x^2\)/ (1.00 x \(10^(-2)\) - x)

Since x << 1.00 x\(10^(-2)\), we can neglect x compared to 1.00 x \(10^(-2)\)in the denominator:

Ka = \(x^2\) / (1.00 x \(10^(-2))\)

Solving for x, we get:

x = sqrt(Ka [HOCN]) = sqrt(1.83 x\(10^(-4)\) x 1.00 x \(10^(-2))\)= 1.35 x \(10^(-3)\)M

Substituting this value for x into the equation for Ka, we get:

Ka = (1.83 x\(10^(-3))\)(1.35 x\(10^(-3))\) / (1.00 x \(10^(-2))\)

= 2.48 x \(10^(-7)\)

Therefore, the value of Ka for HOCN is 2.48 x \(10^(-7)\) at 25°C.

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Answer:

Simple distillation for salt and water

Explanation:

Since there are four groups encircling the sulfur atom, the electron geometry is tetrahedral ( 2 lone pairs and 2 hydrogens)

Tetrahedral electron geometry exists. The shape of molecules is warped.

Due to the lone pair repulsion of the S-H bonds, the molecular geometry of hydrogen sulfide I discovered to be bent (which I had not came across in uniform for some reason), and the angle will be significantly less than 109.5 degrees, about 92 degrees.

It would bend due to the two bonds and two unshared pairs in the center atoms. The atom would only need to be in two bonding areas to be considered linear.

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Answer:

Partial pressure of O2 = 4.93 atm

Explanation:

PV = n RT        R = .082057 L-atm/mol-K

n = 6.3 + 8.15 = 14.45 moles

348 C = 621.15 K

P (65.1) = 14.45 ( .082057)(621.15) = 11.31 atm

Now the fraction of pressure from Oxygen is

   6.3 / (6.3+8.15)  * 11.31 = 4.93 atm