What is Ecosistema Lentico?​

the atomic number of the element x was found to be +7

what is atomic number ?

A chemical element's  nuclear charge number (symbol Z) is the charge number of an atomic nucleus. For conventional nuclei, this is equal to the proton number (np), or the number of protons contained in the nucleus of every atom of that element. The atomic number can be employed to uniquely identify ordinary chemical components. In an ordinary uncharged atom, the atomic number is likewise equal to the number of electrons.

The sum of an ordinary atom's atomic number Z and neutron number N yields the atomic mass number A.

The notion here is that for two covalently bound atoms, oxidation values are assigned by assuming that the more electronegative of the two atoms "takes" all of the bonding electrons shared by the two atoms.

The maximum oxidation state of a specific element happens when all of its valence electrons are "taken" by the atoms to which it is covalently bound.

Since you have X 2 O 7, element X has a + 7 oxidation state.

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Because the hydrocarbons in petroleum are components with equal boiling temperatures, petroleum may be divided by distillation.

Crude oil is divided through fractional distillation into simpler, more usable combinations. Because different hydrocarbons have different boiling points, this approach is applicable.

Fractional distillation: This process is used to separate gasoline from crude oil. On the basis of the different boiling points, it is used to separate the components of miscible liquids.

Crude oil can be divided by distillation into groups of hydrocarbons that boil between two predetermined boiling points since it is a mixture of hydrocarbons with varying boiling points. There are two distinct forms of distillation:

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The mass of 1000 coulombs of electric charge are 6.241 ×10^21 C.

What do you mean by electric charge?

Electric charge, a fundamental characteristic of matter possessed by some elementary particles, controls how an electric or magnetic field affects the particles. Positive or negative electric charge exists in distinct natural units and cannot be manufactured or destroyed. Positive and negative charges are the two main categories of electric charges. When two things are reasonably close to one another and one sort of charge is present in excess, they repel one another. When they are relatively close to each other, two things with surplus opposing charges—one positively charged and the other negatively charged—attract to one another.

1 Coulomb of electric charge = 6.241 × 10^18 C.

So, 1000 coulomb of electric charge = (6.241×10^18) ×10^3

⇒6.241×10^21 C.

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Answer:

Solids have a well defined shape and this -the shape- is "independent" of the space, in other words if we take a rock (solid) its shape would be the same (kind of) no matter in which container we put it. The volume is also well defined and easy to measure. We can use a "ruler" to measure the rock. On the other hand, liquids and gases shape will depend on the container (solid container) or their shape will very similar to the solid body containing them; however liquids are more sensible to mechanical forces as Gravity and therefore their shape will result in a combination of the container and the force of gravity (for example), hence if we put water in a cylindrical container but not enough to fully filled then the shape of the liquid will be cylindrical but because gravity it will occupy just the bottom of the container, while the gases are going to expand until cover the whole space of the container.

In short:

Solids: Well defined shape and volume "independent" of the environment

Liquids: Shape dependable of the container, hence not well defined. well define Volume

Gases: Shape and volume dependable of the container.

The indicated covalent bond is a sigma(single) bond which is a strong bond and cannot easily break.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei. A covalent bond is formed when the electronegativity difference between two atoms is too small for electron transfer to form an ion.

Following are the types of covalent bonds:

CH₃NH₂ is classified as a covalent compound with the IUPAC name methylamine. Each molecule contains one carbon atom, five hydrogen atoms, and one nitrogen atom, all held together by a single covalent bond.

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The number of photons required with a wavelength of 749 nm are needed to melt 445 g of ice is 5.12 × 10²³.

The energy of one photon is given as,

E = (h × C) / λ

E = (6.626 × 10⁻³⁴ × 3 × 10⁸ m/s) / (749 nm × 10⁻⁹ nm/m)

⇒ E = 0.02653 × 10⁻¹⁷ = 2.65 × 10⁻¹⁹ J

The enthalpy of fusion of water is 333.55 J/g.

To melt 445 g of ice, the energy needed = 445 g × 333.55 J/g = 135755 J

Hence, the number of photons required = (135755 J) / (2.65 × 10⁻¹⁹)

                                                                   = 51228.301 × 10⁻¹⁹

                                                                   = 5.12 × 10²³

Hence the number of photons required is 5.12 × 10²³.

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C2H5Br(alc) + OH ‾(alc) → C2H5OH(l) + Br‾(alc)

The rate of disappearance of ethyl bromide change if the solution were diluted by adding an equal volume of pure ethyl alcohol to the solution 1/4 the rate.

The liquid ether-like substance known as ethyl bromide is colourless, flammable, and has a burning flavour. On coming into contact with air and light, it turns yellowish. It can be found in gasoline and is utilised as a fumigant, solvent, and refrigerant.

Ethyl alcohol is the end product of the susbtitution reaction that occurs when ethyl bromide interacts with wet Ag2O. Methyl bromide is extremely poisonous. According to human studies, acute (short-term) methyl bromide inhalation can cause serious damage to the lungs.

Methyl bromide inhalation in humans can have neurological consequences both immediately after exposure and over time. Animal reports of neurological consequences have also been made.

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Five resonance structures are possible for the phosphate ion, PO₄³⁻ and the formal charge are on the each oxygen atom

Resonance structure is the set of Lewis structure that describe the delocalization of electron in a polyatomic ion or a molecule

We can draw five resonance structure for PO₄³⁻ but one of them is  a minor contribution to the resonance hybrid and four oxygen atom single bonded to a phosphorus atom and give every atom an octet and this is not a good structure because it has five atom with formal charges and reduce the number of charges by moving electron to convert a P-O single bond to a P=O double bond and there are four P-O bonds and these are all equivalent and are the major contribution to the resonance hybrid that's why the actual structure is a resonance hybrid of all five structure

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The temperature is increased to 380. 5 k is 67.68ml.

A hypothetical gas made up of molecules that abide by the following conditions is referred to as an ideal gas: Molecular interactions in ideal gases are neutral. The molecules of an ideal gas wouldn't interact with each other or the container walls other than when they collided in an elastic collision.

Formula

V / T = V₁ / T₁

Given,

V = 56.05 mL

T = 315.1 degrees Kelvin

V₁ = x

T₁ = 380.5  degrees Kelvin

Solution

56.05/315.1 = x/380.5                

0.1779 = x / 380.5  (multiply both sides by 380.5)                      

0.1779 × 380.5 = 380.5x/380.5

x = 67.68 ml

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Compound a is a primary amine compound b is a secondary amine compound c is a tertiary amine the common name for the amine d is ammonia

Amines are the organic compound that contain nitrogen atom with a lone pair and they are derived from ammonia means NH₃ in which one or more hydrogen atom is replaced by an alkyl or aryl group and they are known as alkylamines and arylamines

Primary amines are formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group and secondary amine have two carbon bonded to the nitrogen and tertiary amines have the three carbon bonded to the nitrogen and ammonia is the gas made up of nitrogen and hydrogen

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The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.

The reactive non metals are halogens. Halogens have seven electrons in the outermost shell and they only need one electron to complete their octet. This property makes halogen more reactive as compared to the other nonmetal.  due to seven electron in outermost shell they readily accept one electron to achieve the stability. The outermost shell electron are called as valence electron. the outmost electronic configuration for halogen mon metals are ns² np⁵.

Thus, The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.

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-464 4kJ/mol is released by the formation of all the bonds in water (h 2o)

What is bond energy?

Bond energy, which is the amount of energy required to separate the atoms forming a molecular bond into free atoms, is a measurement of how strong a chemical bond is.

The average will be more accurate if additional bond energies of the bonds in various compounds are considered. However, Bond-dissociation energies tailored to a given molecule are more accurate than average bond values. In comparison to single bonds, double bonds have larger energy levels (but not necessarily 2-fold higher).

Compared to double and single bonds, triple bonds have a higher energy level (but not necessarily 3-fold higher).

O-H in H2O has a -464 kJ/mol average bond energy. This is because the O-H bond dissociates with -428 kJ/mol, but the H-OH bond takes 498.7 kJ/mol.

(498.7kJ/mol+428kJ/mol)÷2=-464kJ/mol

Hence , -464 4kJ/mol is released by the formation of all the bonds in water (h 2o)

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The amount of heat required to completely vaporize the sample is 2,692 J

To calculate the amount of heat required use this formula

q = m c Δt

where

q = amount of heat required,

m = mass of the sample

c = specific heat,

Δt= change in temperature

Here,

m = 67.3 g,

final temperature = 140°C,

initial temperature = 100°C,

c = 1.00 J/g°C

To find: Amount of heat required = q = ?

Put the given values in the formula above:

q = (67.3 g) × (1.00 J/g°C) × (140-100)°C

q = 2,692 J

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The number of isomers of Heptane and sketch/draw all the structures is 9 isomers.

Isomers are molecules or polyatomic ions with identical molecular formulae that are, identical variety of atoms of every detail however awesome preparations of atoms in space. Isomerism is the existence or opportunity of isomers. Isomers no longer always share similar chemical or bodily residences.

One in all two or more compounds that have equal chemical components however extraordinary arrangements of the atoms within the molecules and that can have exclusive physical/chemical homes.

Structural isomers are the one's isomers wherein the atoms are absolutely organized in a distinct order with equal molecular formulation. those are the molecules having the identical form of molecular system with distinct connectivities relying upon the order they may be prepared.

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When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of  lithium in new solution is 0.5 moles.

given that :

volume = 1.00 L

molarity = 0.500 M

The solution is tripled by dilution but there will be no effect in number of mole by the dilution.

the number of moles = molarity × volume in L

the number of moles = 1 × 0.500

the number of moles = 0.5 mol

Thus, When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of  lithium in new solution is 0.5 moles.

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The temperature of the metal varied more than the temperature of the water, but the metal also lost heat generated as the water acquired it.

Some of the nearly diamond-hard wear plates used in industrial applications start to weaken between 280° and 350°F. At 280°F, pork butt can be cooked. In general, there is good likelihood that a particularly hard steel component will soften when it is subjected to high temperatures.

Steel emits colors that are incandescent above 800 degrees Fahrenheit. Steel gets an ever brighter shade of red between 1000 and 1500 degrees Fahrenheit. Steel first becomes orange and then yellow between 1600 and 1900 degrees Fahrenheit.

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The pH of clean water increases when an acid is introduced. The opposite is true if a base is introduced to pure water. A solution's hydronium ion concentration must fall as the concentration of hydroxide ions rises.

If there are more hydrogen ions than hydroxide ions in a solution (i.e., pH pOH), the solution is acidic. Since the concentration of hydrogen and hydroxide ions in pure water is constant, even when the pH changes, the water remains neutral (pH = pOH).

Bases and Acids

An acid is a chemical that, when introduced to pure water, will cause the pH to fall. In a similar way, a base is something that will raise the pH of water by 4.

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Answer: D)Uranus

Explanation:

The outer planets, Mars, Jupiter, Saturn, Uranus, and Neptune, are all known as superior planets because their orbits are farther from the sun than the Earth's.

The outer planets are Jupiter, Saturn, Uranus, Neptune, and Pluto.

Answer: D: Uranus

Explanation:

In terms of kinetic molecular theory,  the pressure of the CO₂(g) in the container changes as it is heated to 425k is increases as the the particles moving faster collide with container more forcefully. less than ideal gas law.

kinetic molecular theory,  the pressure of the CO₂(g) in the container changes as it is heated to 425k because the particle are moving faster and the collide with wall of the container forcefully as the pressure in creases. but the pressure at 425 K is less than ideal gas law. because  of the attractive forces between CO₂ molecules.

Thus, In terms of kinetic molecular theory,  the pressure of the CO₂(g) in the container changes as it is heated to 425k is increases as the the particles moving faster collide with container more forcefully. less than ideal gas law.

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Assuming complete combustion, the stated statement indicates that 24 g of methane were consumed.

In the chemical process of burning, an item swiftly combines with oxygen to produce heat. The initial substance and the supply of oxygen are referred to as fuel and oxidizer, respectively. Despite typically being a liquid, fuel for airplane propulsion can also occasionally be a solid, liquid, or gas.

Briefing:

CH4 + 2O₂——————-> CO₂ + 2H₂O

1 mole of methane, or 16 g, will yield =2 x 18 = 36 g of water.

Thus, = 16/36 x 54 = 24 g of methane will be converted into 54 g of water.

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relationship between work pressure and volume can be stated by this formula;

W=PΔV

as we know gas is expanding so it means the work is done by the system

which is shown by a negative sign

W= 138.1 j x 1 L atm / 101.3 j

   = -  1.36 L atm

let's convert torr into atm

P = 783 torr X ( 1 atm/ 760 torr)

    = 1.03 atm

W = -PΔV

- 1.36 L atm = - 1.03 atm x ΔV

ΔV = 1.36 L atm / 1.03 atm

     = 1.32 L  

ΔV = [tex]V_{2}[/tex] - [tex]V_{1}[/tex]

      = [tex]V_{2}[/tex] - 0.0607 L

[tex]V_{2}[/tex] = 1.32 L  +  0.0607 L

       = 1.38 L

the final volume of gas is 1.38 L

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DNA damage leads to accumulation of ____phosphorylated____ p53, which ___increases____ production of a CDK inhibitor to ___halt_____ the cell cycle.

Phosphorylation is the attachment of phosphate groups to molecules or ions. This process and its reverse dephosphorylation are widely used in biology. Phosphorylation of proteins often activates many enzymes. Protein kinases are activated by phosphorylation, activating a series of events that lead to phosphorylation of various amino acids.

When activated, p53 induces the expression of various gene products, causing either prolonged cell cycle arrest in G1, preventing proliferation of damaged cells, or apoptosis to remove damaged cells from the body .

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Answer:

they will dissappear

Explanation:

........

.

The five example of organisms are any animal, plant, fungus, protist, bacterium.

An organism is a collection of molecules working to together form a mostly stable whole that demonstrates the characteristics of life. With phrases like "any sense of life, such as with a plant, animal, fungus, or bacterial, capable of growth & reproduction," dictionary definitions are very general.

A living creature with a organized approach, is capable of responding to stimuli, can reproduce, develop, adapt, and preserve homeostasis is referred to as an organism. Therefore, every animal, plant, fungi, protist, microbe, or archaeon found on Earth would be considered a life.

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Answer: it would be B

Explanation:

I took the test

The products of electrolysis includes hydrogen gas and chlorine gas.

It is significant to remember that the difference between the electrolysis of aqueous and molten sodium chloride results from the fact that the reduction of the sodium ion, or Na+, is energetically more challenging than the reduction of water. Therefore, in the case of aqueous sodium chloride, the reduction of water occurs instead of the reduction of sodium.

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Mass of AgBr is formed when 35.5 ml of 0.184 m agno3 is treated with an excess of aqueous hydrobromic acid is 1.23g.

We may calculate reactant and product amounts using balanced chemical equations thanks to the fundamental concept of stoichiometry. The balanced equation's ratios are used in this instance. Generally speaking, how a reaction will behave depends on the amount of substance present.

Equation formed:

AgNO₃(aq) + HBr(aq) ⇒ AgBr(s) + HNO₃(aq)

Calculate the amount of AgNO3 consumed throughout the reaction.

based on molarity (a 1000 ml solution of AgNO3 comprises 0.184 moles).

AgNO₃ moles in 35.5 ml solution = [tex]\frac{(0.184mol) . (35.5ml)}{1000ml}[/tex]

∴ Moles of AgNO₃ = 0.006532 moles

Moles of AgBr formed by 0.006532 moles of AgNO₃

From balanced reaction eq.,

Moles ratio of AgNO₃ : AgBr = 1 : 1 (AgNO₃ = AgBr)

∴ Moles of AgBr = 0.006532 moles

Mass of 0.006532 moles of AgBr,

Molar mass of AgBr = 187.77g/ml

∵ Mass (AgBr) = 187.77 × 0.006532

Mass of AgBr = 1.23g

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Information would you need to know about the H₂O₂ solution is through stoichiometry experiment

The ideal gas constant R can be found experimentally by determining the number of moles of gas that occupies a particular measured volume at a known pressure and temprature and the H₂O₂ is a chemical compound used un various chemical reactions and is slightly viscous than water and the experiment by decomposition of hydrogen peroxide and using the ideal gas law rearrangement equation we can calculate the value of r and we will need the information such as concentration, volume and moles of  H₂O₂ to determine its stoichiometry

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The pH when 88.5 g of HBr is added will be 7.224

Molarity of HOCl = 0.332 M

Molarity of NaOCl = 0.405 M

Mass of HBr = 88,5 g

pH after adding 88.5 g HBr = ?

For acidic buffer we use the following formula:

   pH =pKa + log (salt / acid)

pKa of HOCl = 7.54

    pH = 7.54 + log (0.405 / 0.332)

    pH = 7.54 + log 1.22

    pH = 7.54 + 0.0864

    pH = 7.623

Calculate the pH after adding 88.5 g HBr

First, calculate the number of moles of HBr added

    number of moles = mass / molar mass

    number of moles of HBr = 88.5 g / 80.91 g/mol

    number of moles of HBr = 1.094 mol

Now the acidity of the solution will be:

   acidity = 0.332 + 1.094

   acidity = 1.426 mol

   excess amount of salt =  1.094 - 0.405

   excess amount of salt = 0.689 mol

   pH = 7.54 + log (0.689 / 1.426)

   pH = 7.54 + log 0.483

   pH = 7.54 + (-0.316)

   pH = 7.224

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The final temperature of the mixture is -9.1°C.

Higher body temperatures release heat while lower body temperatures absorb it. The law of conservation of energy is demonstrated by the calorimetric principle, which states that the total amount of heat lost by a hot body is equal to the total amount of heat gained by a cold body.

Here,

Mass of water [tex]m_{w}[/tex] =500g

Mass of ice [tex]m_{i}[/tex] = 100g

Specific heat of water = 1 cal g⁻¹°c⁻¹

Specific heat of ice = 80 °cal g⁻¹

Let T represent the mixture's final temperature.

How much heat water loses

[tex]m_{w}[/tex] [tex]s_{w}[/tex](∆T)w = 500×1(50-T)

Amount of heat that ice absorbs

[tex]m_{i} L_{fi} + m_{i} s_{w}[/tex](∆T)i = 100×80×100×1(T-0)

In accordance with the calorimetry principle:

Heat gained minus Heat Lost

500×1(50-T) = 100×80+100×1(T-0)

500(50-T) = 8000+100T

2500-500T = 8000+100T

2500-8000 = 100T+500T

-5500 =600T

T = -5500/600

T = -9.1°C.

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