Listen and select the one of two statements that corresponds to each drawing. October 28 11:59 PM 1 attempt remaining Grade settings External referencesVocabulary list Grammar explanation 136-139 Questions Modelo You see:Illustration of a girl in a record store with headphones on. You hear: a. Ella sale a bailar. / b. Ella oye música. You select: b

Answer:

raising the Concentration of liquid

raise the temperature of the system

bubbles of hydrogen gas

Electron geometry and molecular geometry are not the same under circumstances when a molecule has one or more lone pairs of electrons. Electron geometry refers to the arrangement of electron groups around a central atom, while molecular geometry describes the arrangement of atoms in a molecule. In molecules with only bonded atoms and no lone pairs, both geometries will be identical.

However, when lone pairs are present, they occupy space and repel the bonded atoms, leading to a difference between the electron geometry and molecular geometry. Lone pairs exert a greater repulsion force compared to bonding pairs because they are not constrained by two nuclei. This causes the molecular shape to be altered as the bonded atoms are pushed closer together.

For example, consider the ammonia molecule (NH3). The central nitrogen atom has three bonded hydrogen atoms and one lone pair of electrons. The electron geometry is tetrahedral, but due to the lone pair repulsion, the molecular geometry is trigonal pyramidal. Similarly, in a water molecule (H2O), there are two bonded hydrogen atoms and two lone pairs of electrons on the central oxygen atom. The electron geometry is again tetrahedral, but the molecular geometry is bent or V-shaped.

In summary, electron geometry and molecular geometry differ when a molecule has one or more lone pairs of electrons, as they affect the spatial arrangement of the bonded atoms due to increased repulsion forces.

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Answer:

for pH 13 it = strong based the ph 2 is= weak acid

Explanation:

Answer:

The person writes a coefficient of 2 in front of Fe2O3 but then writes a 4 for the number of iron (Fe) atoms. Explain this difference.

Explanation:

The iron oxide Fe₂O₃ is the limiting reagent while carbon (C) is the excess in the given reaction.

A limiting reagent can be described as a reactant that is completely exhausted from the reaction mixture at the completion of a  reaction and is also named a limiting reactant.

When reactants in the chemical reaction are not taken in stoichiometric quantities, the limiting reactant will determine the maximum amount of product that can be formed in a chemical reaction from the reactants.

Given, a balanced chemical equation of the reaction between iron oxide and carbon is:

\(2 Fe_2O_3 + 3 C\longrightarrow 4 Fe + 3 CO_2\)

Given, the amount of the iron oxide = 200 g

The molecular mass of the iron oxide = 159.69 g/mol

The number of moles of iron oxide = 200/159.69 = 1.252

Given the mass of the carbon, = 300 g

The number of moles of carbon = 300/12 = 25

If 2 moles of iron oxide react with carbon moles = 3

1.252 moles of Fe₂O₃ will react with carbon = (3/2) × 1.252 = 1.878 mol

Therefore, Fe₂O₃ is the limiting reactant and carbon is the excess reactant.

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Answer:

The answer is A.) leaving a copper penny in vinegar until it turns green.

All the other options are physical changes, as you can separate the two mixtures.

I hope this helps you! :)

Answer:

Explanation:

Nitrogen is the atmospheric gas that accounts for approximately 21% in the atmosphere.What is atmosphere?The atmosphere is the envelope of gases surrounding the Earth or any other celestial body. Earth's atmosphere is composed of around 78% nitrogen, 21% oxygen, and 0.9% argon, with trace amounts of carbon dioxide and other gases.

Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting approximately 78 percent of Earth's atmosphere.Learn more about Nitrogen:Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting approximately 78 percent of Earth's atmosphere. It was first isolated by Scottish physician Daniel Rutherford in 1772.

Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first.

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Answer:

An aqueous solution is water that contains one or more dissolved substances. The dissolved substances in an aqueous solution may be solids, gases, or other liquids.

The energy radiation per unit area of the material is 1882.12 W/m².

The energy radiation per unit area of a material whose emissivity is 0.694 and temperature is 5.43×10³K can be calculated using the Stefan-Boltzmann law.

The Stefan-Boltzmann law states that the power radiated per unit area (P) by an object is proportional to the fourth power of its temperature (T) and emissivity (ε). The constant of proportionality is the Stefan-Boltzmann constant (σ).Mathematically, this can be represented as:P = σεT⁴Here, σ = 5.67 x 10⁻⁸ W/m²K⁴Given that ε = 0.694 and T = 5.43 x 10³K, substituting these values in the above equation we get:P = 5.67 x 10⁻⁸ x 0.694 x (5.43 x 10³)⁴P = 1882.12 W/m²

Therefore, the energy radiation per unit area of the material is 1882.12 W/m².

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80% copper (Cu)

Cu: 80 :  63.546 = 1.259

O: 20 : 16 = 1.25

Cu:O = 1 : 1

the formula: CuO

89% copper (Cu)

Cu: 89 :  63.546 = 1.4

O: 11 : 16 = 0.6875

Cu:O = 2:1

the formula: Cu₂O

Answer:

C) first

Explanation:

Answer:

Helium has the largest first ionization energy.

Explanation:

Using Boyle's law, As pressure is decreased, the volume will increase.

Boyle's Law describes how pressure and volume relate when the temperature is constant.

P1V1 = P2V2

When temperature is kept constant in this equation, pressure and volume have an inverse relationship.

When the volume is reduced, molecules have less room to move and collide more frequently, which raises the pressure. If the volume is increased, the molecules have more room to move, collisions occur less frequently, and the pressure is reduced.

The combined gas law, however, governs the connection between the three quantities when temperature is included.

As the gas volume decreases, the molecules hit the walls more frequently, raising the pressure; conversely, as the volume grows, the molecules must travel farther to contact the walls, reducing the frequency with which they do so and raising the pressure.

According to Boyle's law, a gas's pressure tends to decrease as its volume rises.

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The correct answer is Neurotransmitters are chemical messengers that are essential for your body to function.

To affect another cell across a synaptic gap, a neuron produces a chemical signaling agent known as a neurotransmitter. Any significant organ, target cell, gland, or muscle cell that receives the signal might be another neuron as well. Neurotransmitters are released from synaptic vesicles in the synaptic cleft, where they may interact with receptors on the target cell. The neurotransmitter's impact on the target cell depends on the receptor to which it binds. From readily available, plentiful precursors like amino acids, which are regularly transformed in a few biosynthetic steps, several neurotransmitters are created.

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Answer:

81cm is the answer.

Explanation:

Let X be the length from the HCl end, and therefore, (2-x) from the other end.

For X length, rate of diffusion is :

​

dx/dt=P A/(Square root of 36.5T

​d(2−x)/dt=PA/(square root of 17 T

Dividing both we get;

X/(2−x)= square root of 36.5/17

X=2/2.466=0.81 or81cm

​

Answer:

What exactly are you asking?

Explanation:

I am unsure, this reaction is a balanced reaction by default if that was what you were asking.

If the formula x2 and y4- form a neutral compound, the total ions required are 3.

When atoms or ions combine in the formation of a compound, no charge is left on the end result of the combination. Thus, a compound's chemical formula is electrically neutral.

Calculating the number of moles involves dividing the given mass by the molar mass. The number of ions will be equal to the sum of the number of moles and Avogadro's number after the number of moles has been determined.

Therefore, the total number of ions needed to create a neutral chemical from the formulas x2 and y4- is 3.

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An oxide of an unknown element r, contains 46. 0 g of r and 16. 0 g of oxygen. If the formula of the metal oxide is r2o, then what is the molar mass of the metal r is 23g.

Given,

 an unknown metal r, contains 46. 0 g of r and 16. 0 g of oxygen.

   which means that the

 weight of oxygen = 16 g

 weight of metal r = 46 g

we have to find the molar mass of metal r..

Now,

  the formula of the compound is r₂O.

which means that the valency of unknown metal is 1.

Now,

  according to the formula of compound,

there is 1 atom of oxygen and 2 atoms of metal r

Hence,

 If in compound there is 16 g of oxygen...

 so ,

2 atoms of compound r weighs 46g

1 atom of r weighs 23g

Hence molar mass of the compound is 23g . And the name of the element is Na i.e Sodium.

Thus, from the above conclusion we can say that, A sample of an oxide of an unknown metal r, contains 46. 0 g of r and 16. 0 g of oxygen. If the formula of the metal oxide is r2o, then what is the molar mass of the metal r is 23g.

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The concentration of the \(H_2SO_4\) solution is 0.1789 (rounded to 4 decimals).

To calculate the concentration of the \(H_2SO_4\)  solution, we will use the concept of moles and the balanced chemical equation:
\(H_2SO_4\) (aq) + 2 NaOH (aq) → \(Na_2SO_4\) (aq) + \(2H_2O\) (l)
First, find the moles of NaOH:
moles of NaOH = volume (L) × molarity
moles of NaOH = 0.01525 L × 0.5866 M = 0.0089459 moles
Since the stoichiometry in the balanced equation is 1:2 (\(H_2SO_4\):NaOH), divide the moles of NaOH by 2 to find the moles of \(H_2SO_4\):
moles of \(H_2SO_4\) = 0.0089459 moles / 2 = 0.00447295 moles
Now, calculate the molarity of \(H_2SO_4\):
molarity = moles of \(H_2SO_4\) / volume of \(H_2SO_4\) (L)
molarity = 0.00447295 moles / 0.025 L = 0.1789 M
The concentration of the \(H_2SO_4\) solution is 0.1789 (rounded to 4 decimals).

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The "geo" in "biogeochemical" refers to the Earth or geosphere, and the processes that occur within it.

Biogeochemical processes are those that involve the interactions between biological, geological, and chemical processes in the Earth's system. They play a critical role in maintaining the balance of the Earth's environment and its resources. Examples of biogeochemical processes include the carbon cycle, nitrogen cycle, phosphorus cycle, and others, which regulate the flow of essential elements and compounds through the atmosphere, oceans, soils, and living organisms. These processes are important for maintaining a stable climate, preserving biodiversity, and supporting human and ecosystem health. The study of biogeochemical processes is important for understanding the interactions between the biosphere, geosphere, and atmosphere, and for addressing environmental challenges such as climate change, pollution, and resource depletion.

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Answer:

When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. So B.

Explanation:

When an electron moves from a higher to a lower energy level, energy is released (often as light).

When an electron moves from a lower to a higher energy level, the electron absorbs a quantum of energy (Option D).

When an electron moves from a lower to a higher energy level, the electron:

A. moves closer to the nucleus. FALSE. It moves farther from the nucleus since lower energy levels are closer to it.

B. absorbs a continuously variable amount of energy. FALSE. According to the quantum theory, it absorbs a discrete (not continuously variable) amount of energy.

C. always doubles its energy. FALSE. The increase in the energy depends on the energy of the quantum absorbed.

D. absorbs a quantum of energy. TRUE. This is stated by the quantum theory.

When an electron moves from a lower to a higher energy level, the electron absorbs a quantum of energy (Option D).

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For this question, since we are given the pressure, number of moles and temperature to find the volume, we have to use the ideal gas equation.

pV = nRT

Now lets put in the values

V = (0.263 mol x 8.314 J/mol x 307 k)/1.15 atm

V = 583.722 L

.

Answer:

26

Explanation:

Given parameters:

Number of neutrons  = 14

Unknown:

Mass number  = ?

Solution:

The mass number of an atom is the sum of protons and neutrons in the atom.

 mass number = number of protons + number of neutrons

Since the atom here is magnesium, number of protons is 12

Mass number = 14 + 12  = 26

Due to the activity series that is given in the image, the reaction that will not take place is FeCl₂ + Br₂ , thus, option A is correct.

From the nature of the question above, we must infer the response that won't happen and as such:

2NaI + Cl₂

Because chlorine can replace iodine, this reaction will take place. Chlorine is higher on the activity series, which explains why.

Sn + H₂SO₄

Due to the fact that tin (Sn) can dispense hydrogen from the acid, this reaction will take place.

FeCl₂ + Br₂

So, since Chlorine cannot be replaced by Bromine, this reaction won't take place. This is due to Bromine's lower position on the activity series than Chlorine.

Fe(NO₃)₃ + Al

Aluminum's ability to replace iron will cause this reaction to take place. This is so that Aluminum (Al) ranks higher than Iron in the activity series (Fe).

Therefore, one can say that the  reaction is thus: FeCl₂ + Br₂ ,

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Avogadro's number is approximately 6.022 × 10^23 formula units per mole.

Given that there are 3.0 × 10^23 formula units of KI, we can calculate the number of moles of KI by dividing the number of formula units by Avogadro's number:

Number of moles = (3.0 × 10^23 formula units) / (6.022 × 10^23 formula units/mol)

Number of moles ≈ 0.498 mol

To find the mass of KI, we can use the molar mass of KI:

Mass of KI = Number of moles × Molar mass

Mass of KI = 0.498 mol × 166 g/mol

Mass of KI ≈ 82.668 g

Therefore, there are approximately 82.668 grams of KI in the sample.

Option A, BF, does not violate the octet rule, option B, XeO, satisfies the octet rule for all atoms, option C, Ne, is a noble gas and already has a complete octet, and option D, AICI3, has complete octets for both the atoms and does not violate any rules.

The incorrect Lewis structure is likely to be the one that violates the octet rule, has an incomplete octet or has an odd number of electrons.

In the given options, only option E, NH, violates the octet rule. Nitrogen has five valence electrons and each hydrogen has one valence electron. If we draw the Lewis structure for NH, we get three lone pairs on nitrogen and one unpaired electron.

This makes a total of nine valence electrons, which is one more than the total available. Therefore, NH does not follow the octet rule and is the incorrect Lewis structure.

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Answer:

CaCO3 + 2 HCl => CaCl2 + CO2 + H2O

Explanation:

CO2 will burst out when the reaction occurs in water, and the ions will be dissociated: Ca(2+) + 2 Cl (-)