Chemists use the letters of the alphabet as what for the elements?

Answer:

A dichotomous key provides users with a series of statements with two choices that will eventually lead to the correct identification of the organism

Explanation:

this should help

One possible drawback to moist-heat cookery is that  a.color b.flavor c.vitamins d.minerals may leach out and be lost in the liquid.

The cost of generating more neutron-rich nuclear systems is measured by the nuclear symmetry energy. According to the system's density. The mechanics of supernova explosions, the characteristics of neutron stars, and the gravitational waves produced by their mergers are all greatly affected by knowledge of the density dependence of nuclear symmetry energy. Understanding the kinetics and outcomes of their collisions in laboratory studies, as well as the characteristics of nuclei, is crucial.

Within the parabolic approximation, the Equation of State (EOS) of homogeneous neutron-rich nucleonic matter with isospin asymmetry = (np)/ and density can be stated in terms of the energy per nucleon E(n, n).

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Mass of gasoline = 37662.93 grams.

Density = mass/volume

mass = Density × volume

mass = 0.737 × 13.5 ×3785.41

mass = 37662.93 g

The word "gasoline" is an American term for motor vehicle fuel. The trademark "Cazeline" or "Gazeline," which bears the last name of British publisher, coffee trader, and social activist John Cassell, is claimed to have had some impact on the phrase.

Gasoline, usually spelled gasolene, is a blend of flammable, volatile liquid hydrocarbons made from petroleum that is used as internal combustion engine fuel.

Numerous distinct compounds containing hydrogen and carbon make up gasoline (hydrocarbons). About 150 distinct hydrocarbons, including butane, pentane, isopentane, and the BTEX chemicals, are often included in a normal gasoline combination (benzene, ethylbenzene, toluene, and xylenes).

Crude oil, which comprises hydrocarbons, organic compounds formed completely of hydrogen and carbon atoms, is the raw material used to make gasoline.

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During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. The acetone, petrol or perfume take this latent heat of vaporisation from our palm. The palm loses heat and feels cold.

Answer:

When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. This results in the palm becoming colder.

Explanation:

Answer: 3.002 ==> C

Explanation:

3.00183 =

3.00183 =3.002 => since 8 is closer to 10 than to 0, add 1 to the 1 in 3.00183

3.002 ==> C

Nicole can access global markets through distributors while avoiding logistical problems and several trade-related concerns. Specialty shops tend to be more expensive and have less choice. at last, Nicole will pay more for the mattress if she gets it at the specialty store.

The simplicity of employing a distributor is its key benefit. Typically, the distributor is in charge of the packaging, shipping, and associated paperwork for customs. The concentrate on a specific class of products that a specialty store has is one of its main advantages. This offers business owners and staff the ability to gain knowledge and a reputation for selection and competence within the store's designated specialization.

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Answer:

fungi

Yeasts are eukaryotic organisms that are included in a group of organisms called “fungi,” which also includes molds and mushrooms. Yeasts can have both positive and negative effects on fermented products consumed by humans and animals.

Explanation:

Answer:  Fungi

Explanation:

Yeasts are eukaryotic organisms that are included in a group of organisms called “fungi,” which also includes molds and mushrooms. Yeasts can have both positive and negative effects on fermented products consumed by humans and animals.

The force that acts on the body is 53.55 N

According to the Newton law, the force is the product of the mass and the acceleration of a body. This is in accordance the Newton second law of motion. We now have to obtain the force that acts on the body.

Mass of the object =  15.3kg

Acceleration of the object = 3.5.0 m/s2

Force = 15.3kg * 3.50 m/s2

Force = 53.55 N

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6HBr+2Al → 2AlBr3+3H2

now, as the reaction is showing

6 moles of  HBr  reactes with 2 moles of Aluminium gives us 2 moles of Aluminium bromide and 3 moles of hydrogen gas

as the question says  10g of HBr reacted with 5g of Al.

(i) mass of Aluminium bromide produced.

moles = given mass/molecular mass

moles =  5g/54g

moles 0.0925 mole

(ii) number of bromide ions formed

6 moles of bromide ions formed in this reaction

now 1 moles = 6.022×10^23

6 moles = 6 ×6.022×10^23

= 36.132×10^23ions

(iii) percentage yield if 0.55 g of aluminum bromide is actually yielded

percentage yield= moles×100

percentage yield= 0.55×100÷107

percentage yield=0.514%

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Answer:

he number of chemically non-equivalent hydrogens is 6.

Molecule "a" is  O2

The O2 Lewis structure has a double bond between two oxygen atoms.  consistent with the octet rule, oxygen atoms have to bond twice. The O2 molecule is diatomic, meaning that two atoms of identical elements are connected in a pair.

What is an octet rule?

The octet rule may be a  chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the identical electronic configuration to a noble gas.

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Answer:

here is your help..

Explanation:

you add 57 and 23 then round the  number to the highest

22559040 J energy is produced by a 14-hp motor deliver in 36 minutes

What is power and horsepower?

Power is defined as rate of work done which means it is work done in 1 second of time

One horsepower (1 hp) is the unit of power based on the work that a horse can do in one second

Given,

1 horsepower = 746 w

P = 14 hp = 746*`14=10444 W

W = Pt = 10444 × 36 × 60 J = 22559040 J

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Answer: sodium ethanoate

Explanation: I hope this is correct

Cu2O and CO2 from the decomposition of cu 2co 3 (s).

The question discuss more about:

What is decomposition reaction?

When one reactant splits into two or more products, this is known as a decomposition reaction. This can be modelled by the all-inclusive formula AB = A + B. • The breakdown of water into hydrogen and oxygen and the breakdown of hydrogen peroxide are two examples of decomposition reactions.

Therefore,

What are the predicted products from the following decomposition reaction?

Cu2O and CO2 from the decomposition of cu 2co 3 (s).

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The entire atlantic ocean has a greater thermal energy and a lower temperature than a cup of boiling water.

The water in the Atlantic Ocean is warmer and has higher thermal energy. The volume of the entire atlantic Ocean is substantially larger than that of a cup of coffee. Due to its substantially larger volume, the water in the entire atlantic Ocean will now undoubtedly have a higher thermal energy content than a single cup of hot coffee. However, a cup of hot coffee has a lower temperature than the atlantic Ocean.

The temperature is higher in a single place because the thermal energy in the coffee is concentrated in a tiny volume. But because the atlantic Ocean's enormous thermal energy is dispersed across such a vast volume.However, the enormous amount of thermal energy in the atlantic Ocean is dispersed throughout a very vast volume, which is why the temperature of the water there is relatively lower in one location.

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Amphiprotic compounds are able to both donate and accept a proton.

Amphiprotic compounds contain a hydrogen atom and lone pair of valence electron.

For example, HSO₃⁻ (hydrogen sulfate ion) is an amphiprotic compound.

Balanced chemical equation for reaction when HSO₃⁻ donate protons to water:

HSO₃⁻(aq) + H₂O(l) ⇄ SO₄²⁻(aq) + H₃O⁺(aq).

Ka = [SO₄²⁻] · [H₃O⁺] / [HSO₃⁻]

Balanced chemical equation for reaction when HSO₃⁻ accepts protons from water:

HSO₃⁻(aq) + H₂O(l) ⇄ H₂SO₄(aq) + OH⁻(aq).

Kb = [H₂SO₄] · [OH⁻] / [HSO₃⁻]

Water (H₂O), amino acids, hydrogen carbonate ions (HCO₃⁻) are examples of amphiprotic species.

Another example, water is an amphiprotic substance:

H₂O + HCl → H₃O⁺ + Cl⁻

H₂O + NH₃ → NH₄⁺ + OH⁻

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Answer:

C

Explanation:

Ice is water in its solid form

the ice melted a bit into water

water is a liquid

The states of matter which are pictured in the image below are solid and liquid.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the  sub atomic particles protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter is always conserved according to law of conservation of matter and is never created nor destroyed and is always conserved.

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The most accurate statement is: water molecules lose opportunities to form bonds with each other when 'interrupted' by oily/hydrophobic ones.

Hydrophobic molecules or hydrophobes have very low solubility in water.

They are nonpolar molecules and do not interact with water molecules.

Oily molecules clump up together in a water because like that, they have minimal interaction with water.

Hydrogen bonds between water molecules (H₂O) will be broken so that the hydrophobes can interact.

When bonds are broken, heat in the system is greater (an endothermic reaction).

Hydrophobic interactions between hydrophobic molecules are spontaneous.

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The concentration in molarity is 0.135 mol/L.

In terms of the amount of material per unit volume of solution, molar concentration is a measurement of the concentration of a chemical species, specifically a solute in a solution.

10 grams of K₃ PO₄ is dissolved in H₂O. to give 350 ml of solution.

The molar mass of K₃ PO₄ is 212.3 g/mol

The molarity is given as:

[tex]Molarity = \frac{moles{~}of{~}solute}{liters{~}of{~}solution}[/tex]

Now,

Moles of K₃ PO₄ = 10 grams K₃ PO₄ × 1 mol K₃ PO₄ / 212.3 = 0.047 mol K₃ PO₄

Liters of solution = 350 ml × 1 L / 1000 ml = 0.35 L

Now,

[tex]Molarity = \frac{moles{~}of{~}solute}{liters{~}of{~}solution}[/tex]

Molarity = 0.047 / 0.35

Molarity = 0.13458 mol/L

Molarity = 0.135 mol / L

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To convert the benzoate salt into benzoic acid. Chemically mixing sodium hydroxide with benzoic acid produces sodium benzoate.

The sodium version of benzoic acid is sodium benzoate, often known as benzoate of soda. It is an aromatic molecule with the molecular weight of 144.11 and the chemical formula C7H5NaO2.

Exactly how is benzoic acid made?

In an industrial setting, toluene can be partially oxidized with oxygen gas to produce benzoic acid. It should be noted that this method typically uses cobalt or manganese naphthenate as a catalyst. Benz amide and benzonitrile can also be hydrolyzed to create this chemical. Baking soda, soda ash, or lye are used to combine benzoic acid with to create sodium benzoate. Because of this reaction, it becomes soluble in water (benzoic acid is not soluble in water on its own). In the United States, the first chemical preservative allowed in foods was benzoic acid or its sodium salt, benzoate. Today, it is still frequently used for a variety of cuisines.

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The change in the moles of the substance in the tank, Na = 10 if it contains solution in which na0 moles of a substance are dissolved.

The chemical compound sodium oxide has the formula Na2O. Glasses and ceramics both use it. Although the compound is rarely found, it is a white solid.

An alkali metal oxide with the chemical formula Na2O is sodium oxide. It is sodium hydroxide in its anhydride state.

In the air, sodium burns with a brilliant, white light.

dNa / dt = Ca/o Qo*t - qot / v Na

⇒ dNa/dt + qo t / v Na = Ca/o Qo t → 1

The integrating factor is e ∫ (Qo t) /v dt

= e (Qo t^2) / 2v

Multiplying 1 by IF we get,

e^(qo t^2/2v) [dNa/dt + Qo t/2v Na] = (Ca/o)*Qo*t*e^(Qo t^2 / 2v)

d/dt (Na e^(Qot^2/2v) = (Ca/o)*Qo*t*e^(Qo t^2 / 2v)

On integrating,

Na* e^(Qot^2/2v) = Ca/o Qo ∫t e^(Qo t^2 / 2v) dt

= v (Ca/o) ∫[Qo*t /v] e^(Qo t^2 / 2v) dt

= v (Ca/o) e^(Qo t^2 / 2v) + k

Na = v(Ca/o) + K e^(Qo t^2 / 2v)

At t = 0,

Na = Nao

⇒Nao = V*Ca/o +k

⇒k = Nao - V Ca/o

At Ca/o = 5, V = 2, Qo = 1, V=2, Nao = 10

we get

Na = 10

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Taking into account the definition of wavelength, frecuency and propagation speed, the frequency of the wave is 4.9967×10¹⁴ m.

Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The propagation speed is the speed with which the wave propagates in the medium.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following expression:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 2,998×10⁸ m/s, the speed of light.

In this case, you know:

Replacing in the definition of propagation speed:

2,998×10⁸ m/s= f× 6×10⁻⁷ m

Solving:

f= 2,998×10⁸ m/s ÷ 6×10⁻⁷ m

f= 4.9967×10¹⁴ m

In summary, the frequency of the wave is 4.9967×10¹⁴ m.

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Two ways that can be used to identify which layer is organic and which layer is the aqueous layer in a liquid-liquid extraction are:

There are many methods that can be used to distinguish two layers from each other using contrast between the two substances in certain properties. One of the common methods that can be used to distinguish aqueous layer from an organic layer is adding water to mixture and observing which layer increases in size. The layer that increases in the size is the aqueous layer, as water is immiscible with organic layer. Thus, water can only increase aqueous layer. Another way is, for a start, the ethereal layer, even laden with organic solute, should be less dense than aqueous layer, and thus should be floating on top. Sometimes you can even tell by rubbing solvent with your fingers.

Extraction is a process used in organic chemistry for isolating a certain substance or a compound from its source material. Since the source material is composed of the various molecules and compounds but only a specific compound is needed, the desired compound has to be separated from the mixture.

A liquid-liquid extraction method is a method used to extract substance using the two immiscible of different natures. Since two liquids are immiscible, they liquids form the two layers when added to the same vessel. This is typically done using the water and an organic solvent that is insoluble in water. When two are mixed, they form an aqueous layer and an organic layer.

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The conversion factor from electrino to coulombs is 1.60×10−19.

The term charge refers to a particle that is positively or negatively charged. The electron is a particle that is negatively charged. One of the popular units that could be used when dealing with electrons is the electrinos.

We know that;

1 electrino = 1.60×10−19 C

It then follows that the conversion factor from electrino to coulombs is 1.60×10−19.

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