How many molecules of SF6 are in
25.0 g SF6? (SF6, 146.07 g/mol)
[?]×10) molecules SF6

Answer:

Particles move faster the farther they are apart, so the container with the most spread out particles.

Answer:

the answer is 0 amu I hope it helps

Answer:

The water cycle is driven primarily by the energy from the sun.

Answer:

the moving of something form it's places or position

Answer:

The correct name is Chromium(iii) oxide

Answer:

the heat wants to travel up. Heat rises

Explanation:

Waist-mounted accelerometry is a non-invasive method that uses accelerometers to detect and analyze movement patterns associated with freezing of gait in individuals with Parkinson's disease, providing valuable insights for understanding and managing this symptom.

Freezing of gait (FOG) is a common and disabling symptom experienced by individuals with Parkinson's disease (PD). It refers to a sudden and temporary inability to initiate or continue walking, often described as feeling "stuck to the ground." Identifying FOG episodes can be challenging, but waist-mounted accelerometry has emerged as a potential tool for this purpose.

Accelerometry involves measuring changes in acceleration, and waist-mounted accelerometers can detect subtle movements and changes in body posture. By analyzing the data collected from these devices, researchers can identify FOG events during freezing-provoking tasks.

During freezing-provoking tasks, individuals with PD are asked to perform specific actions that are known to trigger FOG, such as turning, stepping over an obstacle, or changing direction. The accelerometers worn around the waist can capture the changes in movement patterns during these tasks. This data is then analyzed to identify FOG episodes based on specific movement patterns and characteristics associated with FOG.

The advantage of waist-mounted accelerometry is its non-invasiveness and ability to provide objective measurements of FOG. It allows for continuous monitoring of FOG episodes in a real-world setting, providing valuable insights into the occurrence, duration, and severity of FOG. This information can help healthcare professionals better understand FOG and develop targeted interventions to manage and alleviate this symptom.

In summary, waist-mounted accelerometry is a promising method for identifying freezing of gait in Parkinson's disease during freezing-provoking tasks.

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Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm^3. The radius of the platinum atom is 139pm.

The radius of the platinum atom can be found by the relation of density and radius of atom.

Platinum has a face-centered cubic (fcc) crystal structure which means that 4 atoms are present in each structure.

Hence no. of atoms, Z=4

The radius of atom can be found out by substitution in the below formula:

Relation of density and radius of atom:

Density, d = Z × M / Nₐ × a³    

∴ where, Z is the no. of atoms = 4                

M is the Molecular mass of platinum = 195 g/mol    

 N is the Avogadro's number = 6 × 10²³ / mol                

 a is the radius of the atom = ?                

d is the density = 21.5 g/cm³

⇒ a³ = Z × M / Nₐ × d

⇒ a³ = 4 × 195 / 6 × 10²³ ×  21.5

⇒ a = 139 × 10⁻¹²m

a = 139pm

Hence, the radius of the platinum atom is 139pm.

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The answer is 139pm

The relationship between density and radius of an atom may be used to calculate the radius of a platinum atom.

Platinum has a face-centred cubic (fcc) crystal structure, which implies that each structure has four atoms.

As a result, the number of atoms is Z=4.

Substitution in the following formula yields the radius of an atom:

Atomic density and radius relationship:

Density,\($d=Z \times M / N_{a} \times a^{3}$\)

\($\therefore$\) where, Z is the no. of atoms =4

\($\mathrm{M}$\) is the Molecular mass of platinum \($=195 \mathrm{~g} / \mathrm{mol}$\)

\($\mathrm{N}$\)is the Avogadro's number \($=6 \times 10^{23} / \mathrm{mol}$\)

a is the radius of the atom = ?

\($\mathrm{d}$\) is the density \($=21.5 \mathrm{~g} / \mathrm{cm}^{3}$\)

\($$\begin{aligned}&\Rightarrow a^{3}=Z \times M / N_{a} \times d \\&\Rightarrow a^{3}=4 \times 195 / 6 \times 10^{23} \times 21.5 \\&\Rightarrow a=139 \times 10^{-12} m \\&a=139 p m\end{aligned}$$\)

What is platinum atom?

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The correct statement is: The reaction is spontaneous at standard conditions.

Based on the given ΔG° value of -18.2 kJ/mol, we can determine the following:

a) The reaction is spontaneous at standard conditions: True. A negative ΔG° indicates that the reaction is spontaneous under standard conditions.

b) K<1: Not enough information is provided to determine the value of the equilibrium constant (K). The ΔG° value alone does not directly correspond to the magnitude of K.

c) Products predominate at equilibrium: Not enough information is provided to determine the composition of the equilibrium mixture. The ΔG° value does not provide information about the relative concentrations of reactants and products at equilibrium.

d) The reaction is spontaneous for all starting concentrations of reactants and products: False. The ΔG° value only represents the standard state conditions and does not indicate the spontaneity of the reaction under non-standard conditions.

e) Products are always favored over reactants: False. The ΔG° value does not provide information about the relative favorability of products over reactants. It only indicates the spontaneity of the reaction at standard conditions.

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Answer: D. (Liquid fuel)

Antoine Lavoisier discovered in 1789 that mass is neither created nor destroyed in chemical reactions, which led to the formulation of the Law of Conservation of Mass.

Thus, That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction.

The overall mass will remain constant over time in any closed system if we take into account all reactants and products in a chemical reaction. Lavoisier's discovery transformed science and served as the cornerstone for contemporary chemistry.

Because naturally occurring elements are extremely stable under the circumstances present on the Earth's surface, the Law of Conservation of Mass is valid.

Thus, Antoine Lavoisier discovered in 1789 that mass is neither created nor destroyed in chemical reactions, which led to the formulation of the Law of Conservation of Mass.

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Chlorine atoms that are present in 0.650 mol of ca(clo4)2 is : 7.83 *10^23.

Mass in grams of 1 mole of the substance is called the molar mass of a substance. We can obtain a substance's molar mass by summing the molar masses of its component atoms. We can use the calculated molar mass to convert between mass and number of moles of a substance.

As we know, one mole of any atom is equivalent to the Avogadro's number or 6.02 x 10²³ particles.

0.650 * 6.023 * 10^23 * 2

= 7.83 *10^23 chlorine atoms.

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No, coal is not a mineral. Coal is an organic sedimentary rock formed by the decay and compaction of plant material over millions of years. It is mostly composed of carbon, hydrogen, oxygen, nitrogen, and sulfur.

Minerals, on the other hand, are naturally occurring inorganic substances with a specific chemical composition and crystalline structure.Coal doesn't meet the criteria to be considered a mineral. While it is composed of various elements, it is not crystalline and doesn't have a specific chemical composition. Therefore, coal cannot be classified as a mineral.

Coal is formed from the remains of plants that died millions of years ago. The plant material accumulates in swamps and marshes, and is buried under sediment and rock. Over time, heat and pressure cause the plant material to undergo physical and chemical changes, leading to the formation of coal. The process of coal formation is called coalification, and it takes millions of years. The type of coal that is formed depends on the temperature and pressure conditions that were present during the coalification process.

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Answer:

1. False

2. True

3. True

4. True

5. False

Explanation:

Answer:

c. Chemical bonds are broken, and new ones are formed.

Explanation:

Hope this helps. :)

In a chemical reaction, chemical  bonds are broken, and new ones are formed.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer: In its natural condition, a pure element

a) Transfer function:The pH neutralization process can be represented as a second-order system. The system transfer function can be obtained from the process reaction as shown below, 1/(τ1s+1)(τ2s+1).

Hence, the transfer function is given as: G(s) = 4/(2s+1)(3s+1)The desired closed-loop transfer function:Let’s assume that C(s) is the controller’s transfer function that takes the error and produces the control signal. And, G(s) is the process transfer function. The closed-loop transfer function is given by:T(s) = C(s)G(s)/[1+C(s)G(s)]The desired transfer function must be in a first-order system.

Now, substituting these values in T(s), we get the following equation: 1/(Tas+1) = Kp(1+Tis)4(Tas+1)(2s+1)(3s+1)Hence, we get the following values:Kp = 3.014Ti = 4.96sNominal feedback control may not achieve the design requirementThe nominal feedback control may not achieve the design requirement because the closed-loop transfer function cannot be made first-order with a time constant of 2 min.

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70.9-gram sample of \(Cl_{2}\) gas will occupy Opton C. 22.4 liters at STP.

To determine the volume occupied by the sample of \(Cl_{2}\) (g) at STP, we can use the ideal gas law equation, PV = nRT

where P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (K).

First, calculate the number of moles of \(Cl_{2}\) (g) using its molar mass. The molar mass  \(Cl_{2}\) is 70.9 grams/mol.

Number of moles (n) = mass (m) / molar mass (M)

n = 70.9 g / 70.9 g/mol

n = 1 mol

Now, we can calculate the volume using the ideal gas law:

V = (nRT) / P

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

V ≈ 22.4 L

Therefore, the correct answer is C. 22.4 L.

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The solubility of the given solutes in the corresponding solvents is as follows:

1. Enamel paint is not soluble in water (X).
2. Flour is not soluble in oil (X).
3. Salt is soluble in vinegar (√).
4. Sugar is soluble in water (√).
5. Powdered milk is soluble in hot water (√).

Enamel paint-water: X

Enamel paint is not soluble in water. Enamel paint consists of pigments dispersed in a binder, which is typically an oil-based medium. Since oil and water do not mix, enamel paint does not dissolve or disperse in water. Instead, it forms a separate layer or suspension when mixed with water. Therefore, the solubility of enamel paint in water is considered to be insoluble (X).

Flour-oil: X

Flour is not soluble in oil. Flour is composed mainly of starch, which is a complex carbohydrate. Carbohydrates are generally polar molecules, meaning they have partial positive and negative charges. On the other hand, oil is a nonpolar substance. Due to the difference in polarity, flour does not dissolve in oil. Instead, it forms clumps or a suspension in the oil. Hence, the solubility of flour in oil is considered to be insoluble (X).

Salt-vinegar: ✓

Salt is soluble in vinegar. Vinegar is an aqueous solution of acetic acid. Salt, or sodium chloride (NaCl), is an ionic compound composed of positive sodium ions (Na+) and negative chloride ions (Cl-). When salt is added to vinegar, the positive and negative ions of salt dissociate and are surrounded by the solvent molecules of vinegar. This process is known as solvation or dissolution. Therefore, salt dissolves in vinegar, making it soluble.

Sugar-water: ✓

Sugar is soluble in water. Sugar, or sucrose, is a polar compound composed of carbon, hydrogen, and oxygen atoms. Water is also a polar molecule. When sugar is added to water, the polar water molecules attract the polar sucrose molecules, causing them to dissociate and become surrounded by water molecules. This process results in the dissolution or solvation of sugar in water. Therefore, sugar is soluble in water.

Powdered milk-hot water: ✓

Powdered milk is soluble in hot water. Powdered milk is a dehydrated form of regular milk, consisting of milk solids. When powdered milk is added to hot water, the heat causes the milk solids to dissolve and disperse in the water. The hot water molecules provide energy for the dissolution process. As a result, powdered milk dissolves in hot water, making it soluble.

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Answer:

it's thermal energy

Explanation:

There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.

#carry on learning

Hope it helps

In this exercise we have to use the knowledge of kinetic energy and we can also describe it as a thermal energy.

Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the value of the object's mass and its speed of movement.

Kinetic energy does not depend exclusively on the speed of a body but also on its mass. Any type of body in motion is endowed with this type of energy: translation, rotation, vibration and others.

With these definitions we can write that it will be the same as saying that kinetic energy can be transformed into thermal energy.

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Answer:

New volume V2 = 96 ml

Explanation:

Given:

Old volume V1 = 100 ml

Old pressure P1 = 1.92 atm

New pressure P2 = 2 atm

Find:

New volume V2

Computation:

Using Boyle's Law

P1V1 = P2V2

(1.92)(100) = (2)(V2)

V2 = 96

New volume V2 = 96 ml

Answer:

greenhouse effect is the same as global warming

Explanation:

they both mean warming of the earths surface

According to the American Chemistry Society, cloth-topped "tennis" or "running" shoes are recommended for general laboratory work. Sandals, woven leather shoes, and high heels are not recommended as they do not provide adequate protection for the feet  against spills or dropped objects in a laboratory setting.
The American Chemical Society is a scientific society based in the United States that supports scientific research in the field of chemistry.

Other safety precautions include: Wearing appropriate gloves, masks, lab coat and shoes. Being careful while using pipette. Washing the glassware properly before using etc.

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Plate tectonic processes are responsible for various crustal features, such as mountains at convergent boundaries, mid-ocean ridges at divergent boundaries, earthquakes and volcanic activity at transform boundaries, and visible features like rift valleys and subduction zones.

The three types of plate boundaries are convergent, divergent, and transform boundaries.

Many crustal features can be seen as having resulted from plate tectonics. Where two plates come together at a convergent boundary, they collide and form such features as mountains. When two plates move away from each other the result is a divergent boundary, and they form such features as mid-ocean ridges. A transform boundary forms when two plates slide past each other. If the pressure between two plates builds high enough, the plates may move rapidly causing earthquakes and the occurrence of volcanic activity. Features such as ridges and trenches can be seen from space and lend support to the plate tectonics theory.

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Answer:

hi again

I : Television. Satellites send television signals directly to homes

II : gravity

Answer:

1) I would say television and streaming channels. 2) gravity

Explanation:

Frochrabonloroluces is an incorrectly spelled term. I believe you might be referring to "chlorofluorocarbons" (CFCs), which are chemical compounds that have been known to pollute the atmosphere.

CFCs are a class of compounds that contain chlorine, fluorine, and carbon atoms. They are known for their ozone-depleting properties and have been widely used in refrigeration, air conditioning, foam manufacturing, and aerosol propellants. When released into the atmosphere, CFCs break down and release chlorine atoms, which can then react with ozone molecules, causing the depletion of the ozone layer. This ozone layer depletion has detrimental effects on the environment and human health, including an increase in harmful ultraviolet (UV) radiation reaching the Earth's surface.
Due to these harmful effects, the use of CFCs has been significantly reduced, and they have been replaced by less harmful alternatives, such as hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs). The global efforts to phase out CFCs are primarily guided by the Montreal Protocol, an international treaty designed to protect the ozone layer.
In conclusion, CFCs are chemical compounds that have been known to pollute the atmosphere and contribute to the depletion of the ozone layer. This has led to increased efforts to phase out their use and find more environmentally friendly alternatives.

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