Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?
a. Neils Bohr
b. Erwin Schrodinger
c. Earnest Rutherford
d. Max Planck
e. James Cahdwick

Gas is a type of matter that has no defined shape or volume. Gases can be made up of a single element, such as hydrogen gas (H2), a compound, such as carbon dioxide (CO2), or a mixture of several gases, such as air.

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.

By evaluating the four major gases you're searching for—oxygen (O2), carbon monoxide (CO), hydrogen sulphide (H2S), and methane (CH4)—a 4 gas monitor can help you protect your employees in any setting.

Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4).

In a gas when Volume increase Temperature decreases.

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Answer is yes because to say that the tank is half empty would mean that all the oxygen molecules only occupy half or less of the tank.

Answer:

\(\boxed {\boxed {\sf B. \ 22 \ grams}}\)

Explanation:

We need to use the formula for heat of vaporization.

\(Q=H_{vap}*m\)

Identify the variables.

\(H_{vap}=2260 \ J/g\\Q=50,000 \ J \\\)

Substitute the values into the formula.

\(50,000 \ J=2260 \ J/g*m\)

We want to find the mass. We must isolate the variable, m.

m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.

\(\frac{50,000 \ J}{2260 \ J/g} =\frac{2260 \ J/g*m}{2260 \ J/g}\)

\(\frac{50,000 \ J}{2260 \ J/g} =m\)

Divide. Note that the Joules (J) will cancel each other out.

\(\frac{50,000 \ }{2260 \ g} =m\)

\(22.1238938 \ g =m\)

Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.

\(22 \ g \approx m\)

The mass is about 22 grams, so choice B is correct.

Explanation:

Color. The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring.

Hello, It's me Moriah Elizabeth!

Answer:

When the number of electrons does not equal the number of protons, the atom is ionized.

Foreshadowing is a literary device used by authors to hint or suggest what might happen in the future of the story. It is a way for authors to build tension and suspense, as well as prepare readers for what is to come.

Now, let's look at the lines you mentioned. In these lines, the narrator describes the town of Sleepy Hollow and its inhabitants. The description includes several instances of foreshadowing.

For example, the narrator mentions that the town is "haunted by strange apparitions" and that "superstition is a serious matter" among the people. This hints that supernatural events may occur in the future of the story and that the people of Sleepy Hollow are inclined to believe in them.

The narrator also describes Ichabod Crane, the protagonist, as "gangly and lank" with "bony fingers" and a "long neck." This physical description foreshadows Ichabod's encounter with the Headless Horseman, who is also described as having a long neck.

Furthermore, the narrator mentions that Ichabod is "learned in country psalmody" and has a "whole repertoire of hymns." This foreshadows Ichabod's use of his knowledge of hymns to try and ward off the Headless Horseman later in the story.

In conclusion, the lines you mentioned contain several instances of foreshadowing, which hint at the supernatural events and the fate of Ichabod Crane in the future of the story.

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The ΔHvap of ethyl acetate in the given conditions is 35.08 kJ/mol.

Enthalpy of vaporization:

To find the ΔHvap (enthalpy of vaporization) of ethyl acetate in kJ/mol, you can use the Clausius-Clapeyron equation, which is:

ln(P1/P2) = (ΔHvap/R) * (1/T2 - 1/T1)

Given:
Normal boiling point (T2) = 77°C = 350.15 K (converting to Kelvin by adding 273.15)
Vapor pressure at 20°C (P1) = 73 Torr
Temperature at P1 (T1) = 20°C = 293.15 K (converting to Kelvin)
P2 = 760 Torr (normal atmospheric pressure at boiling point)
R = 8.314 J/(mol*K) (universal gas constant)

First, plug the values into the equation:

ln(73/760) = (ΔHvap/8.314) * (1/350.15 - 1/293.15)

Now, solve for ΔHvap:

ΔHvap = 8.314 * (ln(73/760) / (1/350.15 - 1/293.15))

ΔHvap ≈ 35079 J/mol (rounded to the nearest whole number)

Finally, convert ΔHvap to kJ/mol:

ΔHvap ≈ 35.08 kJ/mol (rounded to two decimal places)

So, the ΔHvap of ethyl acetate is approximately 35.08 kJ/mol.

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a. malleable, flexible, and ductile

The ΔG° at 298 K is  1.665 kJ/mol or  1665.45 J/mol in key step in the metabolism of glucose for energy is the isomerization of glucose-6-phosphate (G6P) to fructose6-phosphate (F6P): G6P ⇄ F6P; K = 0.510 at 298 K.

Calculation ,

Formula used for for energy is the isomerization of glucose-6-phosphate (G6P) to fructose6-phosphate (F6P):

: ΔG° = - RT㏑K                 ( i )

Given equilibrium constant ( K ) =  0.510

Temperature in Kelvin ( T ) =  298 K

Universal gas constant ( R ) = 8.3 J/K.mol

Putting the value of temperature ( T ) , equilibrium constant ( K ) and R in equation ( i ) we get ,

ΔG° = - RT㏑K

ΔG° = - 8.3 J/ K.mol × 298 K ×㏑0.510 =  - 8.3 J/mol × 298 K × ( - 0.6 )

ΔG° = 1665.45 J/mol = 1.665 kJ/mol

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The volume of the square shown in the diagram, given that it has a length of 4 in. is 64 in³

Volume of a square is given by the following formular:

Volume = Length × Width × Height

Recall:

For square shapes, length, width and height are equal i.e

Length = Width = Height

Thus, we can write that the volume of square as:

Volume of square = Length × Length × Length

Now, we shall obtain the volume of square. Details below:

Volume of square = Length × Length × Length

= 4 × 4 × 4

= 64 in³

Thus, the volume of the square is 64 in³

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The question requires us to calculate the amount of solution that could be prepared from 1.85 g of silver nitrate (AgNO3), considering a 5.0% solution.

Considering that 5.0% solution corresponds to a solution where there are 5g of AgNO3 in 100 g of solution (% m/m), we can write:

5.0 g of AgNO3 ---------- 100 g of solution

1.85 g of AgNO3 --------- x

Solving for x, we have that 37g of a 5.0% solution could be prepared from 1.85g of AgNO3.

Answer:

384399861 meters

Explanation:

Answer: Radhika loves to eat sweets and chocolates. She asks her mother for the same before and after every meal. This is an example of bad eating habit.

Explanation:

Both sweets and chocolates contain high amount of fat and sugar. When Radhika is eating the same before and after every meal then it means she is consuming it in excess.

When we eat too much of sweets and chocolates then its remains get deposited in between our tooth and when they remain over there for hours then more amount of bacteria is formed.

Due to this bacteria our tooth starts to decay.

Hence, it is advised even by the doctors to eat sweets and chocolates occasionally and not regularly.  

Thus, we can conclude that Radhika loves to eat sweets and chocolates. She asks her mother for the same before and after every meal. This is an example of bad eating habit.

A refrigerator delays the spoilage of food by slowing down the rate of chemical reactions within microorganisms. Therefore, option B is correct.

The term chemical reaction is defined as the processes, in which substances undergo a chemical change to formed new substances, with all new properties.

Higher temperatures often result in faster chemical reactions. When food is left on the kitchen counter, it can soon become bad. The process is slowed down by the refrigerator's lower temperature, which allows the same food to stay fresh for longer.

Bacteria, molds, and yeasts are all potential sources of microbial deterioration. Food's water activity plays a significant role in determining the type of food decomposition that results.

Thus, option B is correct.

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A group is the column in the periodic table of chemical elements while the period is the row in the periodic table of the elements.

The electron configuration an element describes how electrons are distributed in its atomic orbitals. The atomic number of the element is used.

According to this question;

Titanium is in group 4 and period 4 of the periodic table while Argon is in group 18 and period 3.

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If the central carbon in CH₂Cl₂ has a square planar geometry, then there are two possible configurations of the chlorine atoms - they can be cis or trans to each other.

The cis configuration has the two chlorine atoms on the same side of the molecule, while the trans configuration has them on opposite sides.

In a cis configuration, there are two possible stereoisomers because the two chlorine atoms can be either on the top or bottom of the molecule. In a trans configuration, there is only one stereoisomer because the two chlorine atoms are already on opposite sides.

Therefore, the total number of stereoisomers for CH₂Cl₂ with a square planar geometry is three: two cis stereoisomers and one trans stereoisomer.

In summary, there are three possible stereoisomers for CH₂Cl₂ with a square planar geometry: two cis stereoisomers and one trans stereoisomer.

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Answer to Question #96220 in Molecular Physics | Thermodynamics for Kaleesh

Answers>Physics>Molecular Physics | Thermodynamics

Question #96220

a) Determine the enthalpy changes, ΔH for the reaction below, given the following reactions and subsequent ΔH values. Please rewrite the amended chemical reaction equation again.

N2H4 (l) + CH4O (l) CH2O (g) + N2 (g) + 3H2 (g)

2NH3 (g) N2H4 (l) + H2 (g) ΔH = 22.5kJ

2NH3 (g) N2 (g) + 3H2 (g) ΔH = 57.5 kJ

CH2O (g) + H2 (g) CH4O (l) ΔH = 81.2 kJ

b) Given that the enthalpy of vaporization for water as below:

H2O (l) H2O (g) ΔH vap = 44.0 kJ mol-1

Calculate enthalpy ΔH for each of the following processes:

i) Evaporating 3.00 moles of water

ii) Evaporating 3.00 grams of water

i) Condensing 20.0 grams of water

(3 Marks)

c) Use the enthalpy of formation data to calculate the enthalpy of the reaction below.

2C2H6 (g) + 7O2 6H2O (g) + 4CO2 (g)

Answer:

hearing aid

Explanation:

an artificial body part

A hearing aid is an example of a prosthesis. Therefore, option A is correct.

A prosthesis is an artificial device or replacement for a missing body part or function. In the case of a hearing aid, it is a device designed to assist people with hearing loss by amplifying sound. It acts as a substitute for the natural function of the ear.

A textbook is a written educational resource, gloves are protective coverings for the hands, and a pair of boots is footwear. These items do not serve as artificial replacements for missing body parts or functions.

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The correct answer is C. -0.76 V. the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

The correct answer is C. -0.76 V.

The standard reduction potential, denoted as E°, is a measure of the tendency of a species to gain electrons and undergo reduction in a redox reaction. It is expressed in volts (V) and represents the potential difference between the reduction half-reaction and the standard hydrogen electrode (SHE), which is assigned a potential of 0 V.

In the given half-reaction:

Mg2+(aq) + 2e- → Mg(s)

The species undergoing reduction is Mg2+(aq), and it is being reduced to Mg(s) by gaining 2 electrons.

To find the standard reduction potential for this half-reaction, we can refer to standard reduction potential tables. These tables provide a reference for various half-reactions with respect to the standard hydrogen electrode.

In the table, the standard reduction potential for the Mg2+(aq) + 2e- → Mg(s) half-reaction is listed as -0.76 V. This means that Mg2+ has a tendency to be reduced, and the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

Therefore, the correct answer is C. -0.76 V.

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Answer:

The Quantum Mechanical Model suggested that electrons do not move in fixed shells as the Bohr Model suggested, but rather acted as a cloud of electrons with orbitals electrons can most commonly be found in.

Answer:

They hide their evidence and destroy any if absolutely necessary. You also would need to wear gloves, so you dont put your identity everywhere. Also, you need to flee and just forget that what you did, did not happen. And hope you dont get arrested xD

Explanation:

The text discusses the issue of global warming caused by the release of greenhouse gases, primarily from human activities such as burning fossil fuels and deforestation. It highlights the potential consequences of rising temperature.

The greenhouse effect explains how heat is trapped at the Earth's surface by "greenhouse gases." You may think of these heat-trapping gases as a blanket keeping the Planet warmer than it otherwise would be.

Water vapour, carbon dioxide, methane, and other airborne gases all contribute to the greenhouse effect, which warms the Earth's surface and troposphere (lowest layer of the atmosphere).

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Answer:

true

Explanation:

Answer:

false

Explanation:

i took the test and got it right

Answer:

In chemistry, a product is a substance that is formed as the result of a chemical reaction. In a reaction, starting materials called reactants interact with each other.

Explanation:

In terms of supplying sufficient quantities of drinking water, the most important property of an aquifer is high permeability.

Anything over which a person or a company has legal ownership is considered property. Property can refer to both real objects, like homes, automobiles, or appliances, as well as intangible items with the potential for future value, like stock and bond certificates.

Anything that someone, whether a person or a company, has a legal claim to is referred to be property. The owners have some enforceable rights over it because they have a legal title. It can fall into one of two categories: tangible or intangible. Automobiles, business equipment, furniture, and real estate are examples of tangibles.

Property Assets include any land, buildings, and all improvements thereon as well as any rights to the aforementioned.

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The noble gas with fewer protons than Br, but more than S could be Argon (Ar).

Noble Gas is a group of elements in the periodic table, also known as INERT gases. They are called noble gases because they are very stable and rarely react chemically with other elements or compounds. The noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

To answer the question, we know that the atomic number of bromine (Br) is 35, and the atomic number of sulfur (S) is 16. A noble gas with fewer protons than bromine but more than sulfur would have an atomic number between 16 and 35.

The noble gases with atomic numbers between 16 and 35 are:

- Argon (Ar), atomic number 18

- Krypton (Kr), atomic number 36

Therefore, the noble gas with fewer protons than Br, but more than S could be either Argon (Ar) or Krypton (Kr).

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Answer:

C

Explanation:

Parallel makes the shadow happen every month

  non parallel would be less frequent

He should make the Moon orbit Earth at an angle to the table, and not parallel. So, the correct option is C.

The curving path that an object in space takes around another object as a result of gravity is known as an orbit. Moons orbiting planets, planets orbiting planets, and artificial satellites orbiting the Earth are examples of objects where this is frequently seen.

A route that an object in space follows around another is known as an orbit. A satellite is a thing that orbits the earth. An Earth- or moon-like natural satellite is one possibility. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.

The solar system's planets, comets, asteroids, and other celestial bodies revolve around the sun. The majority of solar system objects travel along or very near a hypothetical flat surface. The ecliptic plane is the name given to this hypothetical plane.

Therefore, the correct option is C.

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There is no known boiling point for liquid air. iv. By mixing the various air constituents in the same ratios that they do naturally, we may create artificial air. Given that there are no energy changes, this is a physical process.

These molecules are constantly bouncing off one another in the outside environment, getting muddled up yet never joining.

There is no set composition for air. Its makeup varies depending on where you are. 2. Using a physical technique such as fractional distillation of liquid air, the components of air can be separated. 3. The boiling point of liquid air is not known. 4.

Therefore, the components of air, such as oxygen, nitrogen, and carbon dioxide, are not chemically bound to one another, air is not a compound.

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By fractional distillation of liquid air, air can be split into its constituents such as oxygen and nitrogen.

Fractional distillation is the process of separating a mixture into its constituent elements, or fractions. Chemical compounds are separated by heating them until one or more fractions of the mixture evaporate. It fractionates using distillation. Under one atmosphere of pressure, the boiling points of the constituent elements generally differ by less than 25 °C (45 °F). A simple distillation is usually utilised when the difference in boiling points is higher than 25 °C. It is used in the refinement of crude oil.

In a laboratory, fractional distillation is performed using standard laboratory glassware and apparatus, such as a Bunsen burner, a round-bottomed flask, and a condenser, as well as a single-purpose fractionating column.

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Since we have been given the balanced reaction, we can just follow the stoichimetry of the reaction to calculate it.

By the stoichimetry, 1 mol of MnO₂ reacts with 4 moles of HCl. using Rule of three, we have:

1 mol MnO₂ --- 4 mol HCl

4.50 mol MnO₂ --- x

So, 18 moles of HCl will react with 4.5 moles od MnO₂ (assuming complete reaction).