tác giả văn bản mẹ tôi là ai ?

A triple bond may consist of one sigma bond and two pi bonds.

Sigma bonds are the most powerful kind of covalent chemical bond. they're fashioned by way of head-on overlapping among atomic orbitals. Sigma bonding is most surely described for diatomic molecules the usage of the language and equipment of symmetry businesses

Sigma bond is a covalent bond formed by overlap of atomic orbitals and hybrid orbitals along the bond axis. The sigma bond in the a hydrogen molecule is formed by overlap of a pair of 1s orbitals, one from each hydrogen atom.

The pi bond is the same as that of the p orbital when seen down the bond axis.

A pi bond is a weaker chemical covalent bond than a sigma bond.

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The mass of oxygen, carbon dioxide, and sulfur dioxide generated from the reaction of black powder and saltpeter is:

The percentage by mass of the constituents of black powder is as follows:

KNO₃ = 75%

S = 10%

C = 15%

The mass of oxygen, carbon dioxide, and sulfur dioxide generated is calculated from the given percentages by mass as follows:

For SO₂; 1 mole S produces 1 mole SO₂:

mass of SO₂ = 280 g * 0.10 / 32.g S * 1 mol SO2 / 1 mol S) * 64.0 g

mass of SO₂ = 56.0 g SO2

mass of O₂ that reacted with S to produce SO₂ will be:

1 mole O₂ reacts with 1 mole S

mass of O₂ = 56.0 / 64 * 32.0

mass of O₂ = 28.0 g O₂

For CO₂; 1 mole C produces 1 mole CO₂

mass of CO₂ produced = 280 g * 0.15 / 12.g/mol x * 44.0 g/mol)

mass of CO₂ produced = 154 g CO₂

mass of O₂ that reacted with C to produce CO₂ will be:

1 mole O₂ reacts with 1 mole C

mass of O₂ = 154 / 44 * 32.0

mass of O₂ that reacted with C = 112.0 g O₂

The total mass of O₂ produced = 112 + 28

The total mass of O₂ produced = 140 g

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The concentration of the MgCl2 solution, prepared by dissolving 23.80 g of solute in enough water to form 500 mL of solution, is approximately 0.1258 M.

To determine the concentration of a MgCl2 solution, we need to calculate the amount of solute (MgCl2) dissolved in the solution and express it in terms of concentration, typically in units of molarity (M).

Given that 23.80 g of MgCl2 was dissolved in enough water to form 500 mL of solution, we can start by converting the volume from milliliters to liters:

Volume of solution = 500 mL = 500/1000 = 0.5 L

Next, we calculate the moles of MgCl2 using its molar mass. The molar mass of MgCl2 is the sum of the atomic masses of magnesium (Mg) and two chlorine (Cl) atoms:

Molar mass of MgCl2 = 24.305 g/mol (Mg) + 2 * 35.453 g/mol (Cl) = 95.211 g/mol

Moles of MgCl2 = mass of MgCl2 / molar mass of MgCl2 = 23.80 g / 95.211 g/mol

Now, we can calculate the concentration using the moles of solute and the volume of the solution:

Concentration (Molarity) = Moles of solute / Volume of solution

Concentration = moles of MgCl2 / 0.5 L

Finally, we substitute the calculated values:

Concentration = (23.80 g / 95.211 g/mol) / 0.5 L

Concentration = 0.5 * (23.80 g / 95.211 g/mol)

Concentration ≈ 0.1258 mol/L or 0.1258 M

Therefore, the concentration of the MgCl2 solution is approximately 0.1258 M.

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Answer:

?

Explanation:

did you mean kilograms?

In general, melting points decrease down a group and increase across a period.

Melting points are the amount of energies needed to break the bonds so that a solid substance turns into liquid phase. In general melting point decrease down the group because the valence shell keep increasing and the outer electrons do not have a strong bond with the nucleus. And the melting point increases across the period because as the valency increases the bonds become stronger.

The periodic table is classified into groups and periods. The vertical columns are called the groups, while the horizontal rows are the periods.

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Potassium Peramanganate .

The equation is followed as

\(\\ \ast\sf\hookrightarrow {K\atop Potassium}+{MnO_4\atop Manganeese\:Oxide}\longrightarrow {KMnO_4\atop Potassium\:Peramanganete}\)

Answer:

The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. Mass is denoted using m or M.

Explanation:

the different between mass and weight is that the weight is the measure of the force of gravity on an object and the mass of an object will never change ,but the weight of an iteam can change based on its location

Ammonium chromate

May I get brainliest if its right? ;-;

O2 will diffuse from alveoli into blood and CO2 will diffuse into alveoli from blood, if the partial pressure of oxygen in the alveoli is 104 mmhg and 40 mmhg in the capillaries surrounding the alveoli.

If a container is filled with multiple gases, each gas will exert pressure, which is known as partial pressure. Its partial pressure is the pressure of any gas contained within the container. The pressure that one gas in a mixture will exert if it takes up the same volume on its own is referred to as partial pressure. The tiniest air sacs in your lungs are called alveoli. The alveoli's job is to transport molecules of oxygen and carbon dioxide (CO2) into and out of your bloodstream.

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Answer:

Energy is added to water in the liquid state. As a result, water's molecules speed up, the empty space between them increases, and water changes from a liquid to a gas. This process is endothermic.

Explanation:

I got it right so I hope you do to.

Answer:

insoluble substances

Explanation:

Answer:

Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. Another machine that loses input work is a bicycle.

Explanation:

Hope this helps.

The factor which increases as the efficiency of a machine increases is: work output.

Efficiency can be defined as a ratio of work (energy) output to work (energy) input.

Mathematically, the efficiency of a machine is given by the formula:

\(Efficiency = \frac{W_O}{W_I} \times 100\)

Where:

Work can be defined as the amount of energy required to move an object from one point to another.

Hence, the work done by a machine is the product of the perpendicular force acting on the machine and the distance it covers or travels.

Ideally, the work output of a machine is highly dependent on its efficiency and as such, it is a factor which increases as the efficiency of a machine increases

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Answ  Es la B .

Explanation

By raising the temperature of a liquid, it turns into a gas, therefore its particles will have more movement and its kinetic energy will increase. the more you raise the temperature, the more space they will have between the molecules.

The product of the aldol-dehydration reaction with diethylketone and p-tolualdehyde (one equivalent of aldehyde) is 3,5-dimethyl-2-cyclohexenone.

Here is the reaction mechanism:

Step 1: Aldol condensation

Diethylketone and p-tolualdehyde react in the presence of a base, usually NaOH or KOH, to form an aldol. The alpha carbon of the diethylketone acts as a nucleophile and attacks the carbonyl carbon of the p-tolualdehyde. The resulting intermediate is a beta-hydroxy aldehyde.

Step 2: Dehydration

The beta-hydroxy aldehyde intermediate loses a water molecule in the presence of an acid or heat to form an alpha, beta-unsaturated carbonyl compound. In this case, the product is 3,5-dimethyl-2-cyclohexenone.

Here is the structural formula of the product:

```

     CH3         CH3

      |           |

      C           C

     / \         / \

    C   O       C   O

   / \         / \

  C   C       C   C

 /     \     /     \

H       H   H       H

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The parts of an amino acid that are important in the protein buffer system are the amino group (-NH2) and the carboxyl group (-COOH).

These two groups can act as both an acid and a base, allowing them to maintain a stable pH within the body. When the pH level in the body becomes too acidic, the amino group will act as a base and attract hydrogen ions (H+), forming NH3+.

When the pH level becomes too basic, the carboxyl group will act as an acid and release hydrogen ions, forming COO-. This ability to both accept and donate hydrogen ions makes amino acids crucial in regulating pH levels and maintaining proper physiological function.

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A domain is atomic if elements of the domain is considered indivisible units that is cannot be divided in parts.

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A matter can change from one state to another by absorbing or losing energy. Some of the example of such changes are melting, boiling, freezing, etc. Here 'Ga' changes into liquid state at high temperature.

The three states of matter represents the three distinct physical forms in which matter can take in most environments. The common states of matter are solid, liquid and gas. A change of state is a physical change in the matter.

When the temperature or pressure of a system changes, then there occurs a change of state. The intermolecular interaction between the molecules increases with the increase in temperature and pressure. Similarly when the temperature decreases, molecules form a rigid structure.

Thus a change of state occurs on changing some parameters.

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Answer:

Sodium

Explanation:

Explanation: The element with electron configuration 1s22s22p63s1 belong I A group in the periodic table and it is sodium because it loses one electron. We have periodic table in attachments. Sodium is a chemical element with the symbol Na and atomic number 11

Answer:

increase

Explanation:

Answer:

D. 18.62

Explanation:

18.62 grams are in a 25.62-gram sample of carbon dioxide.

1 gram of carbon = 2.66 grams of oxygen.

25.62 grams of carbon dioxide = x gram of oxygen.

There will be 25.62 grams of oxygen in a sample.

In carbon dioxide, 2.66 grams of oxygen is present for 1 gram of carbon.

So, 25.62 grams of the sample contains 18.62 grams of oxygen.

Therefore, 18.62 grams are in a 25.62-gram sample of carbon dioxide.

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Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

Answer:

true

Explanation:

The water gained approximately 4,801.0 calories of heat from the burning cheese.

To figure out the number of calories gained by the water, we need to use the formula:

calories = mass of water (in grams) x specific heat capacity of water (1 calorie/gram Celsius) x change in temperature (in Celsius)

First, we need to find the mass of the water. We know that Carrie poured 176.4 mL of water into the can, so we need to convert that to grams:

176.4 mL x 1 g/mL = 176.4 g

Next, we can calculate the change in temperature:

40.4 degrees Celsius - 13.1 degrees Celsius = 27.3 degrees Celsius

Now we can plug in our values and solve for calories:

calories = 176.4 g x 1 calorie/gram Celsius x 27.3 degrees Celsius
calories = 4,801.1 calories

Rounding to the nearest 0.1 calorie, we get:

calories = 4,801.1 calories ≈ 4,801.0 calories

Therefore, the water gained approximately 4,801.0 calories of heat from the burning cheese.

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The minimum energy needed by the photons to react with silver bromide in the film is approximately 57.9 kJ/mol. Then, the wavelength is 206 nm.

Wavelength of a wave is the distance between two consecutive crests or troughs of the wave.

To find the wavelength of the energy in nm, we can use the equation:

E = hc/λ

where E is the energy in joules, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength in meters.

First, we need to convert the energy from kJ/mol to J/photon:

57.9 kJ/mol = 57.9 x 1000 J/mol / 6.02 x 10²³ mol^-1

= 9.626 x 10²⁰ J/photon

Now we can use the equation above to find the wavelength:

9.626 x 10²⁰ J/photon = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s) / λ

Solving for λ, we get:

λ = hc/E = (6.626 x 10⁻³⁴ J s)(2.998 x 10^8 m/s) / 9.626 x 10⁻²⁰J/photon

  = 2.06 x 10⁻⁷ m

Finally, we convert the wavelength from meters to nanometers:

λ = 2.06 x 10⁻⁷ m x (10⁻⁹ nm/m)

  = 206 nm

Therefore, the wavelength of the energy needed to react with silver bromide in 35 mm photographic film is approximately 206 nm.

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The heat released by its complete combustion of 171 ml of acetone is -4304.5 Kcal.

Acetone is an organic compound with the system (CH₃)₂CO. it's miles the best and smallest ketone. it is a drab, particularly unstable and flammable liquid with a function smelly odor. Acetone is miscible with water and serves as a vital natural solvent in its personal proper, in industry, home, and laboratory.

Calculation:-

C3H6O(l)+ 4O2 (g) ---> 3CO2 (g) +3H2O (g), ΔHo of the reaction =-1790 kcal

  Volume acetone contained in the bottle =  177mL

  density = 0.788 g / mL

   ∴  mass of the substance present= 0.788 x 177

                                                        =139.476 g

     number of moles of acetone =mass / molar mass

                                               = 139.476 / 58

                                               =2.404

  One mole of acetone on combustion releases -1790Kcal of heat

   ∴  2.404 moles of  acetone releases  2.404 x ( -1790) = -4304.5 Kcal of heat.

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To calculate the pH of the resulting solution after titrating 2.0 ml of 0.10 M NH3 with 25 ml of 0.10 M HCl, a detailed calculation is needed.

Given the volumes and concentrations of NH3 and HCl, we can determine the number of moles for each compound. The balanced chemical equation for the reaction between NH3 and HCl is NH3 + HCl → NH4Cl. By using the formula C * V = n (where C is concentration, V is volume, and n is moles), we find that NH3 has 0.0002 moles and HCl has 0.0025 moles. Since the reaction is 1:1, all NH3 is consumed, resulting in 0.0002 moles of NH4Cl. Considering the concentration of NH4Cl and its hydrolysis, the pH of the resulting solution is 9.25.

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I think the answer would be

Dilution of a buffer solution with a small amount of water will not change the ph of the solution.

Hope this helps

There will be no change in the pH of buffer solution because the pH of a buffer will be constant always. And it makes the solution in a certain pH.

A buffer solution is the solution with constant pH used t maintain the pH of a solution in a certain value. There are both basic and acidic buffers. Basic buffer is made by mixing a weak base with its salt and it maintains the basic pH.

An acidic buffer is made by mixing a weak acid with its salt and used to maintain the acidic pH. Buffer solution will not change in pH on addition of water or acid or any base.

On each dilution the buffer will make the added concentration of acid and base in equal. Like if we added water the release H+ ion will be consumed by the basic buffer and maintain the pH.

Hence, upon dilution by water, the pH of buffer solution does not change.

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Answer:

I'm converting this if I could remember how

2.882568

2 110321/ 125000

T-T sorry if I'm wrong I have bad memory

so I recommend not using my answer at all,

if that is even how y'all write it.