what is the answer??????​

Johannes Kepler was a German astronomer who discovered three fundamental laws of planetary motion in the early 17th century. These laws describe the motion of planets in our solar system and are still used today to understand the movement of celestial bodies.

Kepler's Laws of Planetary Motion are:

These laws help scientists understand the motion of planets and other celestial bodies in our solar system, and have led to many important discoveries in astronomy and astrophysics.

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The factors affecting the solubility of a solute in water are:

The solubility of a solute is the amount of solute which dissolves in a given volume of solvent at a given temperature.

The solubility of a solute is affected by the following factors:

The solubility of solids substances increases with temperature while the solubility of gases decrease with temperature

Substances having ionic bonds are more soluble than those with covalent bonds

The solubility of gases increases with temperature.

In conclusion, the solubility of substances measures the amount of the substance that dissolves in a solvent.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

relevant to the claim i think

B. when water changes state from a solid to a liquid, thermal energy is absorbed.

The process of moving energy from one system to another, such as through the transmission of heat, work, or mass, is known as energy transfer.

It should be noted that the transformation of energy into another form or the transfer of energy from one location to another.

The mode of energy transfer are:

In summary, thermal, radiant, chemical, nuclear, electrical, motional, acoustic, elastic, and gravitational energy are some of the different types of energy.

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The pressure of the gas in the container when the volume is 132.5 mL is 465.54 torr (rounded to the nearest 0.01) with units of torr.

To solve this question, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature. Since the sample of neon is at a constant temperature and the number of moles of gas is constant, we can use the equation P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Using the given values, we can write:
P1V1 = P2V2
(757.2 torr) x (81.4 mL) = P2 x (132.5 mL)
Solving for P2, we get:
P2 = (757.2 torr x 81.4 mL) / 132.5 mL
P2 = 465.54 torr
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Answer:

it should be +0.46 :)

Explanation:

I just took the test and got it right.

Answer:

I think it's +1.14 V, but don't take my word for it..

The paramagnetic species from the options provided is E. O2

Paramagnetism is a property of materials that have unpaired electrons in their atomic or molecular orbitals, causing them to be attracted by an external magnetic field. Diamagnetic materials, on the other hand, have all their electrons paired and are repelled by a magnetic field.

In the given options, only O2 has unpaired electrons in its molecular orbitals, making it paramagnetic. Each oxygen atom has six valence electrons, and they combine to form a double bond with two unpaired electrons in the pi* antibonding molecular orbital. These two electrons are the unpaired electrons responsible for the paramagnetic nature of O2. The magnetic moment of O2 is aligned with the external magnetic field and is enhanced by it.

Nb3+, Cd2+, Zn, and Ca all have all their electrons paired, and their magnetic moments cancel out each other, making them diamagnetic. Nb3+ has a 3+ charge, and its electrons are paired in the d orbitals, and Cd2+ has a 2+ charge, and all its electrons are paired. Zn and Ca are metals with all their valence electrons paired in their d and s orbitals, respectively.

In summary, only O2 is paramagnetic among the given options due to the presence of two unpaired electrons in its pi* molecular orbital. The other options are diamagnetic, having all their electrons paired.

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The term refers to harmful chemicals emitted directly into the air from natural processes and human activities as primary pollutants.

Primary pollutants are those that are emitted directly into the atmosphere from sources such as factories, vehicles, and natural sources like volcanoes and wildfires. Common examples of primary pollutants include carbon monoxide (CO), nitrogen oxides (NOx), sulfur dioxide  particulate matter (PM), and volatile organic compounds (VOCs).

These pollutants can have harmful effects on human health and the environment and are an important focus of air quality regulations and initiatives to reduce air pollution.

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Full Question: The term that refers to harmful chemicals emitted directly into the air from natural processes and human activities is what? Please choose one of the following options:

Answer:

the first option, tasting a pasta sauce after adding a new ingredient.

Explanation:

tasting a pasta sauce after adding a new ingredient is not an observation because there is no qualitative or quantitative data to be taken from that experience.

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Based on the problem being investigated and the data collected, the type of investigation the students conducted is the composition of the Martian soil sample and the evidence of past life on it.

The evidence of past life on Mars is tiny seed-like fossils that appear to be pieces of fossilized shells.

Mars is the second-smallest planet in the Solar System, only slightly larger than Mercury, and is the fourth planet from the Sun.

Research has sought to find evidence for life on Mars.

Based on the study, tiny seed-like fossils serve as evidence for life on Mars.

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The analytical technique you are referring to is known as management by exception.

This technique involves identifying the areas where performance is deviating significantly from the standard and focusing management's attention on those areas to take corrective actions. By doing so, management can save time and resources by not scrutinizing areas where performance is close to the standard.

Management by exception allows managers to prioritize their efforts and resources on areas that require the most attention, helping them to make better decisions and improve overall organizational performance. This technique is commonly used in financial management, budgeting, and operations management to monitor and control performance effectively.

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Answer:

25.60% of NaCl in the mixture

Explanation:

With the amount of AgCl produced we can now the moles of Cl⁻ = Moles of NaCl. With these moles we can now the mass of NaCl and, as total mass was 3.613g, it is possible to determine mass percent of NaCl in the mixture.

Moles NaCl:

2.268g AgCl * (1mol / 143.32g AgCl) = 0.01582 moles AgCl

Molar mass AgCl 143.32g/mol

0.01582 moles AgCl = Moles Cl⁻ = Moles NaCl

Mass NaCl (Molar mass: 58.44g/mol):

0.01582 moles NaCl * (58.44g / mol) = 0.9248g NaCl in the mixture

Mass percent:

(0.9248g NaCl / 3.613g) * 100 =

Answer:

Electron gain enthalpy becomes more and more negative from left to right in a period. As we move across a period from left to right the atomic size decreases and the nuclear charge increases

Answer: Variation in electron gain enthalpy in the period : in the modern periodic table, on moving from left to right across a period the atomic size of elements decreases and the effective nuclear charge increases.

hope it helps you

Explanation:

A physical Change

Explanation:

BECAUSE the dissolving material can solidify after a while

A chemical change involves a chemical reaction and the formation of new products...

In contrast, dissolving sugar or another covalent compound is a physical change because chemical bonds are not broken and new products are not formed...

If you dissolve sugar in water, you get sugar molecules in water.

so therefor its a PHYSICAL CHANGE and not a chemical change

Answer:

The cell goes through the cell cycle/mitosis

Explanation:

The cell cycle is basically the process of dividing

G1 phase is where the cell grows in size, and make sure that everything is ready to divide.

Synthesis or the S phase is where the cell copies its DNA.

G2 phase is where the cells check that all its DNA has been correctly copied.

Mitosis or M phase, where the cell finally divides in two. If the cells keep on dividing exponentially, they will become billions of cells.

Exposure to perchlorate has been shown to reduce thyroid hormone production and inhibit the uptake of iodide, which is required for healthy function of the thyroid gland.08-Apr-2009The chemical used in rocket fuel that affects the thyroid gland is PerchloratesB.

Perchlorates are known to interfere with the thyroid gland's ability to produce hormones, which can lead to health problems. A. PerchloratesPerchlorates are chemicals used in rocket fuel that can affect the thyroid gland. They interfere with iodine uptake, which is essential for the production of thyroid hormones. This disruption can lead to imbalances in hormone levels and potential thyroid dysfunction.

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Answer:

A substance with a high activation energy is expected to have a slow reaction rate.

Since we know that the activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be.

Hence, a substance with a high activation energy is expected to have a slow reaction rate.

Answer:

Covalent bonding involves the sharing of electrons between two or more atoms. Ionic bonds form when two or more ions come together and are held together by charge differences.

Answer:

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

Ionic bond refers to a type of chemical bond which generates two oppositely charged ions. This bonding refers to the complete transfer of valence electrons between atoms

( Refer the attached image for their respective examples )

Answer:

a) The predominant Brownstead-Lowry acid- base is perchloric acid

b) A conjugate acid base pair is HClO4 and ClO4^-

c) forward reaction is favored and equilibrium position lies towards the far right

Explanation:

The molecular equation is;

HClO4(aq) + NaH2PO4(aq) -----> H3PO4(aq) + NaClO4(aq)

The net ionic equation of the reaction is;

H^+(aq) + H2PO4^-(aq) ----> H3PO4(aq)

The predominant Brownstead-Lowry acid- base is perchloric acid .

A conjugate acid base pair is HClO4 and ClO4^-

Since the both species; perchloric acid and sodium dihydrogen phosphate are both highly soluble in water yielding ions and also dissociate to a large extent in solution, the forward reaction is favoured leading to the formation of phosphoric acid. Remember that phosphoric acid does not easily dissociate in solution hence the forward reaction is faster than the reverse reaction and the equilibrium position lies towards the far right.

B = 146

C = 56

There are two types of nuclear reactions  

Fission reaction is the splitting of an atomic nucleus by firing a particle  

Fusion reaction is a combination of two atomic nuclei  

There are several particles involved in atomic nuclei reactions:  

In a nuclear reaction, it is always found that the atomic number (Z) and mass number (A) are the same either before or after the reaction

Reaction(Fission reaction ) :

\(\tt ^{239}_{94}Pu+^1_0n\rightarrow ^B_CBa+^{91}_{38}Sr+3^1_0n\)

mass number :

\(\tt 239+1=B+91+3.1\\\\240=B+94\\\\B=146\)

atomic number :

\(\tt 94+0=C+38+3.0\\\\94=C+38\\\\C=56\)

Answer:

Explanation:

Matter that always has exactly the same composition is classified as a pure substance. Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.

Answer:

1)Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom.

2)All matter is made of atoms, Atoms are indivisible and indestructible.Compounds are formed by a combination of two or more different kinds of atoms, A chemical reaction is a rearrangement of atoms.

3)B

Explanation:

Answer:

Ionic bonds are stronger than covalent bonds

Answer: A. 2.00 moles

Explanation:

To determine the number of moles of nickel in a 117 g Ni sample, we can divide the mass of the sample by the molar mass of nickel:

moles = mass ÷ molar mass

= 117 g ÷ 58.69 g/mol

= 2 moles

Therefore, there are approximately 2 moles of nickel in a 117 g Ni sample and the correct answer is A. 2.00 moles

It is important to note that the molar mass of a substance is defined as the mass of one mole of that substance. One mole of a substance is equal to \(6.022\) × \(10^{23}\) units of that substance, which is known as Avogadro's number. The molar mass of a substance is often used to convert between mass and number of moles, as shown in the calculation above.