What are 5 ways to prevent non communicable diseases?.

Mass of Sr(OH)₂ should be added to a 400 ml volumetric flask is 24.34 gm.

Let the mass of Sr(OH)₂ = P g

Molar mass of Sr(OH)₂ = 121.63 g/mol

Mole of Sr(OH)₂ = P gm/ 121.63 g mol⁻¹ = 0.00822 × P mol

[Sr(OH)₂] = (0.00822 × P mol) / 0.400 L = (0.2055 × P) M

[OH⁻] = 2 × [Sr(OH)₂] = 0.0411 P M

pH = 14

pOH = 14 - 14 = 0

[OH⁻] = 10⁰ = 1

∴ 0.0411 P M = 1

⇒ P = 24.34 gm

Hence, mass of Sr(OH)₂ should be added to a 400 ml volumetric flask is 24.34 gm.

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Under far from equilibrium conditions, the intrinsic dissolving activity of the basal (010) or edge (001) surfaces of polygonal calcium sulfate anhydrite crystals and gypsum has been studied.

A field of science that studies how forces affect the motions of physical objects or how a biological or chemical system changes, as well as how quickly such a system is changing and how a natural or chemical change was brought about.

Two disciplines of physics known as kinematics and kinetics deal with how an item moves. Despite the fact that both terms have a similar pronunciation, they differ in a few ways. Equations of motion are used in kinematics to describe motion.

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5.67 x 10²³ molecules of carbon dioxide contain 38.7g of gas.

One carbon atom is covalently doubly linked to two oxygen atoms in each of the molecules that make up carbon dioxide. At room temperature, it exists as a gas. In the atmosphere, carbon dioxide serves as a greenhouse gas because it absorbs infrared radiation despite being transparent to visible light.

Carbon dioxide is used as a refrigerant, in fire extinguishers, to blow coal, foam rubber and plastics, inflate life rafts and life jackets, blast coal, promote plant growth in greenhouses, immobilize animals before slaughter, and in carbonated drinks.

1 mole of ( 6.023 × 10²³ molecules ) of Co₂ is 44g

Then, 5.67 x 10²³ molecules of contain 38.7gm of gas

Thus, 5.67 x 10²³ molecules of Co₂ contain 38.7g.

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Answer: If you are talking about Hormones or how they have been changing recently through puberty then i think kids are now starting to look up to older people or kids so that’s why they seem older

the reported molar concentration of the sodium hydroxide solution will be too high when is used for the standardization of the naoh solution.

The term "standardization" in scientific or analytical chemistry means the process of determining standards or concentrations of a particular substance.

One of the benefits of standardization, and the most important one, is that you get results with minimal error.

.A standard solution has an accurately known concentration and for this experiment sodium hydroxide was standardized with a primary standard acid, potassium hydrogen phthalate. A primary standard could be any pure chemical that can be used as the initiation of a quantitative analysis.

If the khp is only 90% pure, the real mass of the acid will be less than weighed doing less the real moles of potassium hydrogen phthalate. Thus, in titration, volume of NaOH will be less than real volume and reported molar concentration will be too high.

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In a solution, the substance present in the largest quantity is called the solvent , while the substances dissolved in smaller quantities are called solute.

What is the difference between a solvent and solute?

In Chemistry, solvent is defined as the medium which dissolves the other substances.

In general, a solution is a combination of a solute and a solvent.

For example, let's take a mixture of water, slat and sugar.

Here water is the solvent as it is present in large quantity while sugar and salt are solutes.

To put it simply, a solution is a homogenous mixture that is formed when solute is added to the solvent.

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Wetlands being drained for housing development are an example of habitat destruction.

A wetland is a place where land is seasonally or permanently covered with salt water, fresh water, or something in between.

Habitat destruction is the elimination or alteration of the conditions necessary for the survival of plants and animals, affecting the health of individual species as well as the global ecosystem. Group of dwellings or condominiums, generally of similar construction, generally constructed and sold or leased by a manager. Habitat destruction can lead to species loss.

Drainage of wetlands into housing estates therefore causes habitat destruction.

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The atomic number states the number of protons, so the number of protons in the element silicon is 14.

Atoms are made up of subatomic particles namely protons, electrons and neutrons. In an atom the three particles have a certain amount.

Protons are particles that make up atoms that are positively charged and have a mass as large as that of hydrogen, which is 1.67262 x 10⁻²⁷ kg or 1,836 times heavier than electrons. Protons are so deep in the atomic nucleus that they cannot be disturbed by particles outside the atom.

The element silicon (Si) has an atomic number = 14 and a mass number = 28

So that the number of subatomic particles is:

The number of protons = atomic number

= 14

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The  correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.

The atomic radius of an element can be defined as  distance from the nucleus to the outermost shell of the atom. The trend of atomic radius in the periodic table is that when we move from top to bottom in a group the atomic radius of chemical element increases . when we move from left to right in a period the atomic size decreases. so according to this the atomic size of given elements from largest atomic radius to smallest atomic radius is K > Fe > Se > Kr.

Thus, The  correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.

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Answer: Atom

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A piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because As an intensive physical property.

Calorimeter, device for measuring the heat developed throughout a mechanical, electric, or chemical reaction and for calculating the heat ability of substances. Calorimeters have been designed in splendid range.

The frame at better temperature releases heat while the body at lower temperature absorbs heat. The principle of calorimetry shows the regulation of conservation energy, i.e. the overall warmness lost through the new frame is same to the full warmth won by way of the cold body.

The primary ice calorimeters have been built based on Joseph Black's idea of latent warmness, introduced in 1761. Antoine Lavoisier coined the time period calorimeter in 1780 to explain the apparatus he used to measure warmth from guinea pig breathing used to melt snow.

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An acid is capable of donating a proton or hydrogen ion to another substance.

Acids are substances that can donate H+ ions to bases. therefore a hydrogen atom is a proton and one electron, technically an H+ ion is just a proton. A base is a molecule or ion up to accept a hydrogen ion from an acid. Acidic substances are usually recognized by their sour taste.

The stronger the acid, the more readily it donates H+. For example, hydrochloric acid (HCl) totally dissociates into hydrogen and chloride ions and is high.

So we can conclude that Acids give away particles with a positive charge. Bases receive positively charged particles. They are both critical for chemical reactions.

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore,  earth's core is the layer of earth is liquid with the highest density.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

The liquid layer of the Earth's core, made of iron and nickel, that lies beneath the Mantle and surrounds the inner Core.

Therefore, earth's core is the layer of earth is liquid with the highest density.

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Increasing order of electronegativity Scandiun < copper < Selenium

b. Polonium < oxygen < sulfur

c. Francium < cesium < rubidium.

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical detail to attract shared electrons while forming a chemical bond. An atom's electronegativity is tormented by each of its atomic wide varieties and the distance at which its valence electrons reside from the charged nucleus.

Electronegativity is a chemical belonging that describes the tendency of an atom or a practical organization to attract electrons toward itself. The electronegativity of an atom is tormented by both its atomic quantity and the distance that its valence electrons reside from the charged nuclei.

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1:1 is the molar ratio of acid to base for the neutralization reaction between HCl and NaOH.

HCl + NaOH → NaCl + H₂O

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

Neutralization is the reaction of an acid and a base, which forms water and a salt.

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value for δu is 20 kj when a system that is absorbing 30 kj of heat and is doing 10 kj  work done.

Data given that work done by the system and heat is absorbed by the system.

Therefore,

q=30 kj

w=−10kJ

Now from first law of thermodynamics,

ΔU=q+w

=ΔU=30+(−10)=20kJ

=Uf​−Ui​=6⇒Uf​=(Ui​+20)

δu=20 kj

First Law of Thermodynamics: The change in total internal energy of a particular system between two states is described by the first law of thermodynamics. The first law of thermodynamics states that when heat is introduced to a system or when work is done, the total internal energy will change.

A positive result when calculating work done indicates that the system releases energy into the environment while performing work. If the value is negative, the environment's work on the system has contributed energy to it.

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Except DNA all the rest molecules have been synthesized in experiments similar to the ones performed by miller and urey.

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An example of molecule that cannot be represented by a single Lewis structure is Ozone (O₃).

A Lewis Structure may be defined as the representation of electrons of an atom with the help of dots and symbols. The symbols are used for representing initials of atom and dots are used for electrons. If there is a molecule, which is to be represented as Lewis's structure, then the bonds are shown with the help of straight line. However, there are some atoms which cannot be represented by a single Lewis structure. For those atoms different resonating structures are drawn. Resonating structures are different Lewis structures f similar molecule or atom in which delocalization of electrons takes place. These structures are drawn because a single Lewis structure is unable to explain all the properties of the molecule.

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If we will burn less fossil fuels in the future, the carbon dioxide levels will eventually decrease.

Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels and the use of limestone in concrete. As a result, the atmospheric concentration of carbon dioxide is growing substantially. This greenhouse gas (carbon dioxide) interacts with solar energy in the Earth's atmosphere leading to the greenhouse effect.

Greenhouse effect prevents excess heat from the planet's atmosphere that would otherwise escape to space, thus the greenhouse effect plays a significant role in maintaining the planet's temperature. Long-term emission reductions assist us in preventing catastrophic climate change.

Reducing the use of fossil fuels helps human health, environmental ecosystems, and even saves lives practically instantly. It is not merely a long-term investment to delay climate change

Thus, the correct answer is- decrease in the carbon dioxide level.

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Mass of CaCO3 per liter =115.09 milligrams.

The metric system's abbreviation mg stands for milligram. The smallest unit of weight, the milligram, is used to quantify minuscule amounts, such as powdered compounds that will be utilized in a scientific experiment. A paper clip weighs about one gram, which is the metric system's accepted unit of weight.

Molar mass of CaCO₃ = 100·0869 g/mol

moles per liter = 0.00115 mol

Mass of CaCO₃per liter = moles x Molar mass

Mass of CaCO₃ per liter = 0.00115 x 100·0869

Mass of CaCO₃ per liter =  0·11 509grams

Mass of CaCO₃ per liter = 115.09 x 10⁻³ grams

10⁻³g = 1 milligram

Mass of CaCO₃ per liter =115.09 milligrams.

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A fuel like natural gas is burned by a lot of hot water heaters. Because combustion is an exothermic reaction, the fuel's burning causes the water to heat up.

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Answer:

the option is (A)

Explanation:

The balanced chemical equation is

4Fe

(g)

+3O

2(g)

→2Fe

2

O

3(g)

Thus, 4 moles of Fe reacts with 3 moles of oxygen to form 2 moles of ferric oxide.

So 8 moles of Fe will react with 3×

4

8

=6 moles of oxygen to form 2×

4

8

=4 moles of ferric oxide.

9.0−6=3.0 moles of oxygen will remain as excess.

A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.

A ring , a disk and a solid sphere all have equal mass. the moment of inertia of all is given as :

a ring : m r²

a disk = 1 / 2 mr²

a solid sphere : 2 / 5 mr²

where m is the mass of all . and  r is the radius which is same for all.  so the object which the the least moment of inertia will reach the bottom first.

Thus, A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.

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The expected enthalpy change in the process of the vaporization of freon is 144.7 kJ.

The enthalpy change of a process or reaction is the amount of heat absorbed or evolved during by the process.

The expected enthalpy change in the process of the vaporization of freon is calculated from the formula below as follows:

Hence;

Enthalpy change = molar enthalpy of vaporization  * moles of substance

molar enthalpy of vaporization of freon = 34.99 kJ/mol

Moles of freon = mass/molar molar mass

moles of freon = 500 / 120.91 moles

Enthalpy change = 34.99 kJ/mol * 500 / 120.91 moles

Enthalpy change = 144.7 kJ

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Complete question:

A common refrigerant (Freon-12, molar mass 120.91 g/mol) is alternately vaporized in tubes inside a refrigerator, absorbing heat, and condensed in tubes outside the refrigerator, releasing heat. This results in energy being transferred from the inside to the outside of the refrigerator. The molar enthalpy of vaporization for the refrigerant is 34.99 kJ/mol. If 500.0 g of the refrigerant is vaporized, what is the expected enthalpy change Δ H??

Besides nylon, other product is formed from the reaction of adipoyl chloride and 1,6-diaminohexane is nylon6,6 polyamide

Nylon is the any numerous strong tough elastic synthetic polyamide material that are fashioned into fiber, filament, bristle or sheet and used especially in textile and plastics and a solution of adipoyl chloride in cyclohexane is poured on top an aqueous solution of 1,6 diamino hexane in a beaker and nylon 6,6 polyamide is formed at the interface of two immiscible liquids and is carefully drawn from the solution and placed on a glass rod

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We know that higher the object more will the potential energy,

Same way we can say that The potential energy of an electron is high when the electrons are excited

and jumps from lower energy orbital to the higher energy orbitals and goes farther away from the nuclear attraction region.

The formula to find the energy of electron at nth shell is given in the figure.

We know that electron carries a negative charge.

If you put a charged particle in motion and change its direction, it will radiate energy.

But electrons behave like waves, and these waves helps us know the probability of finding electrons i.e. orbitals that we label as s, p, d, and f orbitals.

Being in the orbitals of a particular shell, electron's energy will be limiting due to counter nuclear forces.

Electron as to leave atom, or an say nuclear region to attain its highest energy.

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According to the principles of gravitation by Newton, every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.

Gravitational force is a kind of force by which an object attracts other objects into its centre of mass. This force of attraction depends on the mass of both objects.

Gravity is directly proportional to the mass of the object and inversely proportional to the distance between the objects. Thus force of gravity increases with mass and decreases with distance.

The sentences can be completed as:every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.

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Answer:Match the statements for the three principles for Newton's Law of Gravitation.

1 .

Gravitational force

attracts every other object.

2 .

Every object

depends on the quantity of mass.

3 .

Distance between objects

factor that also affects the force of gravity.

please answer quick grrrr betch as neggas

Explanation:

Hydrogen has only one electron, the only force that matters (in a classical approximation) is that which exists between the positively charged nucleus and the single negatively charged electron.

The negatively charged electrons in a multi-electron atom repel one another. This phenomenon, which we refer to as "electron screening," often increases the energy of all orbital energy levels and divides the energy of a shell's subshells.

The many discrete energy levels (or, energy states) for an atom, ion, or molecule are depicted in an energy level diagram. Only electronic states, only vibrational states, or both electronic and vibrational states may be depicted in an energy level diagram.

A Jablonski diagram is one sort of energy level diagram that shows both the electronic states of an atom, ion, or molecule and the electronic transitions between these states that these entities might experience. The states are piled vertically, with the states with greater energies being stacked higher. Several stacks with the same spin multiplicity states may be included in the figure (e.g., singlet-singlet or triplet-triplet states).

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Hello..!

¿What is Ecosistema Lentico?

It is one that presents a closed structure and that its waters are permanently stagnant.

Are:

Answer:

Lentic Ecosystem

Explanation: