Choose the answer that best explains why Orion is important to star watchers.
Orion is located on the celestial equator. Its location causes the rest of the stars to appear to revolve around Orion as the Earth rotates.
Since Orion can be seen in both the Southern and Northern Hemispheres it is useful for finding north in the night sky.
Orion, the hunter, was an important figure in Greek Mythology making the constellation of central importance to astronomers.
Orion is easy to locate, it can be seen in both hemispheres and is helpful for locating prominent stars, nebulas and surrounding constellations.

Answer:

30 grams

Explanation:

Molarity of a solution represents its molar concentration, and can be calculated by using the formula as follows:

Molarity (M) = number of moles (n) ÷ volume (V)

Based on the information provided, volume of solution = 500 milliliters, molarity = 1M

Volume of solution in liters = 500mL ÷ 1000 = 0.50L

Molarity = n/V

1 = n/0.50

n = 0.50moles

Using mole = mass/molar mass

Molar mass of CH3COOH (acetic acid) = 60g/mol

Mass = mole × molar mass

mass = 0.50 × 60

mass = 30 grams.

9. melting point

10. balloons float because they are filled with hydrogen, a gas which is less dense than air.

11. specific gravity

12. element

13. mixture

14. sodium and chlorine

15. cutting of paper

16. condensation

17. 1 and 3

18. heat energy is released

NiCl₃ is the formula of the ionic compound nickel(III) chloride

We know the valency of the Nickel (Ni) is +3 and the valency of Chlorine (Cl) is -1. Now for being a compound it needs to be neutral.

So, we have to take 3 molecules of Chlorine to neutralise the charge of one molecule of Nickel, which means the formula will be NiCl₃.

So, the equation of formation will be \(Ni+3Cl \rightarrow NiCl_3\)

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The accurate description of a geocentric solar system is the earth as a reference point.

The solar system refers to the arrangement of the sun and the planets. The description of the solar system in which the earth constitutes the center or reference point is called the geocentric model.

An alternative and more accurate model devised by Copernicus is the heliocentric model in which the sun lies at the center of the solar system.

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Answer:

2.9x10⁻⁷L is the volume this amount of gas occupy

Explanation:

Assuming there are 7.8x10¹⁵ atoms

Based on the general gas law:

PV = nRT

Where P is pressure = 1atm

V is volume = Our incognite

n are moles of the gas:

7.8x10¹⁵ atoms * (1mol / 6.022x10²³ atoms) = 1.30x10⁻⁸ moles of gas

R is gas constant = 0.082atmL/molK

And T is absolute temperature = 273.15K at STP

Solving for Volume:

V = nRT/P

V = 1.30x10⁻⁸ moles*0.082atmL/molK*273.15K / 1atm

V = 2.9x10⁻⁷L is the volume this amount of gas occupy

The relationship between temperature and reaction speed is direct.

The speed of a reaction accelerates with temperature.

How does the practical impact of temperature on reaction rate work?

The kinetic energies of A and B both increase with rising temperature, leading to more collisions per second and a higher proportion of these resulting in chemical reactions. As a result, the rate typically rises as temperature rises.

What are the rates of reaction?

The rate of reaction when concentration is changed can be gauged in two different ways. By assessing a liquid's "cloudiness," it is possible to gauge how quickly a precipitate forms. The second involves using a measuring cylinder or gas syringe over water to gauge the volume of gas produced.

What are the 4 factors that affect the rate of reaction?

temperature, pressure, and reactant type, along with concentration.

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Answer:

La respuesta está en la explicación

Explanation:

La viscosidad se puede definir como la resistencia al movimiento que presenta un líquido.

Al verter dos líquidos por separado en una pendiente, podrás ver cómo un líquido se tardará más en llegar al final de la pendiente que el otro. Este líquido será EL MÁS VISCOSO.

Así podrás, con el cronómetro, medir el tiempo que cada líquido se tarda en llegar a cierto punto de la pendiente, EL QUE TARDE MÁS SERÁ EL MÁS VISCOSO.

An accurate step in the procedure to name a binary molecular compound using IUPAC nomenclature rules is to; End the name of the second element with the suffix-ided.

What is IUPAC ?

The International Union of Pure and Applied Chemistry is reffered as IUPAC. It is a global scientific organization that establishes guidelines for chemical nomenclature, terminology, measurements, and symbols. IUPAC also publishes international recommendations for chemical safety and environmental protection and provides guidance on the use and application of chemical research.

What does Binary means?

Binary is a base-two number counting, calculating, and representation system. This means that, unlike the decimal system (base 10), which counts in tens, binary counts in powers of two. Binary numbers are made up of only two digits, 0 and 1, and each digit is known as a "bit." Binary is used to represent data and perform calculations in computing and electronic systems.

Therefore the correct option is C. End the name of the second element with the suffix-ided.

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Answer: There are 576.46 number of grams present in 16.95 mol hydrogen peroxide \((H_{2}O_{2})\).

Explanation:

Number of moles is defined as the mass of substance divided by its molar mass.

The molar mass of \(H_{2}O_{2}\) is 34.01 g/mol. Hence, mass of hydrogen peroxide present in 16.95 moles is calculated as follows.

\(Moles = \frac{mass}{molarmass}\\16.95 mol = \frac{mass}{34.01 g/mol}\\mass = 576.46 g\)

Thus, we can conclude that there are 576.46 number of grams present in 16.95 mol hydrogen peroxide \((H_{2}O_{2})\).

For a concentration of PBDEs in herring gull eggs, doubling time for PBDEs in this source is 0.778 yrs. The concentration in 2010 is equals to 44.16 ppm.

We have a concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990.

Concentration in 2000 = 7000 ppm

= 7000 × 10³ ppb

We have to doubling time for PBDEs in this source and concentration in 2010.

Time = 10 yr

The rate constant is \(k = \frac{ 2.303 }{t} \frac{ log[a]}{log[a - x]}\),

Plugging the values, \(k = \frac{ 2.303 }{10} log( \frac{ 7000× 10³ }{1100})\)

= 0.875/yr

Doubling time = 0.69/k

= 0.778 yrs.

Now, the we determine the concentration in 2010. Let the concentration be equal x.

\(0.778 = \frac{ 2.303 }{10} log(\frac{ x}{7000 })\)

=> \(\frac{ x}{7000 \: ppm} = 10^{3.8}\)

=> x = 44.16

Hence, required value is 44.16 ppm.

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Answer:

The vertical columns of the periodic table are called groups, or families. The significance is elements with similar properties are placed in the same vertical columns. The horizontal rows of the periodic table are called periods. The significance is that properties vary from left to right along the rows.

Explanation:

We just did this in science

Answer:

columns in the periodic table are reffered to as "periods". periods represent elements with the same number of shells i.e all elements in period 1 have 1 shell (k shell) and vice versa.

Answer

b. Oil, water, chloroform.

Explanation

Between water, chloroform, and oil, chloroform is the most dense substance (1.5 g/cm3), followed by water which has a density of 1.0 g/cm3. The least dense substance is oil with density of 0.9 g/cm3. Therefore, the oil will be at the top, followed by water, then chloroform will be at the bottom.

The fluids layered from top to bottom are oil, water and chloroform. Therefore, the correct option is option B.

A fluid is defined as a substance that has the ability to flow and conform to its surroundings. They can be found in both liquids and gases, among other forms. Liquids, like water, have a specified volume but no clear shape, whereas gases, like the air, have neither a specific volume nor shape. We need fluids to survive every day. Since water makes up the majority of the fluid in our bodies, they are essential for our survival. Fluids are also essential in many industrial processes, such as manufacturing, energy production, and transportation.

Therefore, the correct option is option B.

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Increasing the pressure in the system would favor the forward reaction in the equilibrium, which is the production of Ni and CO gas.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will shift to the direction that reduces the effect of the change.

In this case, increasing the pressure would cause the system to shift towards the side with fewer moles of gas, which is the side with solid Ni and CO gas.

Therefore, increasing the pressure would result in a higher rate of nickel production, as more Ni(CO)4 would be converted to Ni and CO gas. However, it is important to note that increasing the pressure beyond a certain point may not result in any significant changes in the rate of the reaction, as the equilibrium constant for this reaction may be reached at high pressures.

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Answer:

yeh they are all correct .

585 moles of O₂ can be produced by letting 390.0 grams of KCIO3 react.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

The balanced equation for the decomposition of KClO3 is as follows:

2KClO3 ⇾ 2KCl + 3O2  

Now, use dimensional analysis and the stoichiometry (mole ratio) of the balanced equation:

390.00 mols KClO3 x 3 mole O2 / 2 mole KClO3

= 585 moles Oxygen.

Thus, 585 moles of O₂ can be produced by letting 390.0 grams of KCIO3 react.

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The compound that cannot contribute a hydrogen atom capable of participating in the formation of hydrogen bonds is CHCl3, which is also known as chloroform.

Chloroform does not have a hydrogen atom bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine), which is necessary for the formation of hydrogen bonds. Hydrogen bonding occurs when a hydrogen atom is bonded to an electronegative atom and interacts with another electronegative atom (such as oxygen or nitrogen) in a different molecule. In the case of CHCl3, the hydrogen atoms are bonded to carbon, which is not electronegative enough to form hydrogen bonds. Therefore, CHCl3 cannot contribute a hydrogen atom capable of participating in the formation of hydrogen bonds.

Chloroform, with the chemical formula CHCl3, is a colorless, volatile liquid that has a sweet, fruity odor. It was historically used as an anesthetic, although its use for this purpose has significantly declined due to safety concerns. Chloroform is now primarily used as a solvent in various industrial and laboratory applications.

In terms of its molecular structure, chloroform consists of a central carbon atom bonded to three hydrogen atoms and one chlorine atom. The carbon-chlorine bond is a polar covalent bond, with chlorine being more electronegative than carbon. However, chloroform does not have hydrogen atoms directly bonded to nitrogen, oxygen, or fluorine atoms, which are the atoms typically involved in hydrogen bonding.

Hydrogen bonding is a special type of intermolecular force that occurs between molecules with polar covalent bonds, where hydrogen is bonded to a highly electronegative atom. The partially positive hydrogen atom in one molecule is attracted to the partially negative atom (such as oxygen or nitrogen) in another molecule, resulting in a relatively strong interaction. This interaction is responsible for many important properties of substances like water, where hydrogen bonds contribute to its high boiling point, surface tension, and ability to dissolve various substances.

In the case of chloroform (CHCl3), although the carbon-chlorine bond is polar, it lacks the necessary hydrogen atom bonded to an electronegative atom like nitrogen or oxygen to participate in hydrogen bonding. Therefore, chloroform cannot contribute a hydrogen atom capable of forming hydrogen bonds with other molecules.

It's important to note that while chloroform cannot participate in hydrogen bonding, it can still exhibit other types of intermolecular forces, such as dipole-dipole interactions and London dispersion forces, which arise due to temporary fluctuations in electron distribution within the molecule.

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The systematic name of the coordination compound Co(NH₃)₃Cl₃ is trichloridobis(ammine)cobalt(III). This name is based on the rules of systematic nomenclature for coordination compounds.

The first part of the name, trichloridobis, indicates that the complex has three chloride ligands (tri-chlorido) and two ammine ligands (bis(ammine)). The next part, cobalt(III), specifies the central metal ion and its oxidation state.

The use of systematic nomenclature is important in chemistry because it allows us to communicate the exact composition of a compound using a standardized naming convention. This helps to avoid confusion and misunderstandings when communicating about chemical compounds. Additionally, systematic names can provide information about the structure and properties of a compound, which can be helpful in predicting its behavior in different chemical reactions.

In summary, the systematic name of the coordination compound Co(NH₃)₃Cl₃ is trichloridobis(ammine)cobalt(III), which describes the compound's composition and structure in a standardized and informative way.

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Answer:

whatttttttttttttr//ttttt

Answer: B, a fusion recrion creates waste material that is easier to store than fission.

Fusion produces far less harmful waste than fission does. The reliance of something independent like whether a reaction will stop on its own when something goes wrong is never indefinite (technological failures are unpredictable and destructive a lot of the time when it comes down to nuclear power).

The acid-dissociation constant (ka) for an unknown monoprotic acid, which has a pH of 5.42, is  2.24 x 10⁻⁶.

The acid dissociation constant (Ka) for this acid can be calculated using the formula Ka = 10^(-pKa) where pKa is the negative logarithm of Ka. The pH of a 0.095 M solution of an unknown monoprotic acid is 5.42. Using this information, we can calculate pKa as follows:

pH = pKa + log([A⁻]/[HA]) 5.42 = pKa + log([A⁻]/[HA])

Since we know that this is a monoprotic acid, we can assume that [A⁻] = [HA]. Therefore:

5.42 = pKa + log(1) pKa = 5.42

Now that we have pKa, we can calculate Ka:

Ka = \(10^{-pKa} Ka\) = 10⁻⁵ Ka = 2.24 x 10⁻⁶.

Therefore, the acid-dissociation constant (Ka) for this acid is 2.24 x 10⁻⁶.

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Based on the formula for calculating quantity of Heat, the student requires the mass, temperature change and the specific heat capacity of the reaction mixture.

The enthalpy change of a reaction is the amount of heat evolved or absorbed when reactant molecules react to form products.

In the use of a calorimetry to determine the enthalpy of a reaction, the law of conservation of energy is applied.

The quantity of Heat is calculated using the formula below:

Therefore, in addition to the masses of the solutions and the temperature change, the student requires the specific heat capacity of the reaction mixture.

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In ionic compounds, the particles are most strongly attracted to one another due to the presence electrostatic forces of attraction between oppositely charged ions.

Ionic compound or electrovalent compound is a type of compound which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond and the compound is called as ionic compounds.

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Diazonium ions are often synthesized at low temperatures because they are highly unstable and can decompose readily at higher temperatures.

These ions are typically formed by the reaction of primary aromatic amines with nitrous acid, which is typically carried out at low temperatures (around 0-5°C) to avoid decomposition of the diazonium ions.

At higher temperatures, diazonium ions can decompose through a number of different pathways, such as losing nitrogen gas to form an aryl cation, which can then rearrange to form a more stable carbocation.

Additionally, the formation of diazonium salts is an exothermic process, meaning that it releases heat, and higher temperatures can cause the reaction to become uncontrolled and potentially hazardous.

Once formed, diazonium ions can be further reacted to form a range of different products, such as azo dyes, which are commonly used as textile dyes. These reactions typically require higher temperatures to proceed, but they must be carefully controlled to avoid decomposition of the diazonium ion.

In summary, diazonium ions are synthesized at low temperatures to avoid their decomposition and to maintain control over the reaction.

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The presence of a hydroxyl group (OH) stretching at around 3300–3500 cm-1 and a carbonyl group (C=O) stretching at about 1700–1750 cm-1 are two diagnostic  signal indications in the IR spectrum of the indanol product that point to the formation of the intended product.

Diagnostic signals are distinct traits that can be utilised to determine if a molecule, functional group, or physical attribute is present or absent in a spectrum or analysis. Diagnostic signals are signals that are specific to a certain chemical structure or bond, allowing for the identification of the compound or the presence of specific functional groups, in the context of spectroscopy. These signals can be utilised to locate and measure the target molecule or functional group because they are frequently connected to certain peaks, wavelengths, or frequencies. Chemical analysis frequently relies on diagnostic signals because they make it possible to precisely and accurately identify certain substances or functional groups in intricate combinations.

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The correct option is (b)- the substitution pattern could be indicated by numbering the ring carbon atoms.

What is carbon?
The nonmetallic chemical element carbon (C) belongs to Periodic Table Group 14 (IVa). Despite being widely dispersed, carbon is not very abundant in nature—it only makes up around 0.025 percent of the Earth's crust—yet it produces more compounds than all the other elements put together.

What is atom ?

The smallest component of an object that cannot be destroyed chemically. Protons (positive particles) and neutrons make up the nucleus (center) of each atom (particles with no charge). The nucleus is surrounded by negative electrons.

Therefore,  correct option is (b)- the substitution pattern could be indicated by numbering the ring carbon atoms.

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