1. 5.8g of lithium bromide is dissolved in water to make a 270 L solution. Express the concentration in ppm.

Answer:

D) CH2

Explanation:

The empirical formula of propene is CH₂ as it has chemical formula of C₃H₆ which on division of subscripts give empirical formula as CH₂.

Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.

Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.

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poste en français s’il vous plaît

Answer:

Be careful, your chemistry teacher knows that you posted this question and he bookmarked this page!

Explanation:

From an online cheimstry teacher.

Answer:

- The Valence/Bonding Electrons (whatever name you address them as) in Flourine are closer to the nucleus than the Valence/Bonding Electrons are in an atom of Bromine.

Explanation:

Hopefully this was helpful!

Here's link\(^{}\) to the answer:

bit.\(^{}\)ly/3gVQKw3

Answer:

B

Explanation:

Jackson noticed that the music from his cell phone sounds louder when laid on his desk than when he held it up in the air. Sound waves move faster through solids because the molecules are closely packed together. Therefore, option D is correct.

When energy moves through a medium and propagates away from the sound source, it creates a pattern of disruption known as a sound wave. Pressure waves are generated by the vibration of objects and are known as sound waves.

When energy forces air molecules to shift in and out of one another, sound is produced. The sound's amplitude increases as the particles approach closer or farther apart. A sound's volume and intensity are determined by its amplitude. The sound gets louder and more intense the larger the amplitude.

The results of the testing demonstrated that Solid was the best medium out of the three for sound to travel loudest. The liquid medium came in second. The least effective medium was air.

Thus, option D is correct.

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The Einstein model assumes that the atoms in the metal behave as harmonic oscillators with a characteristic frequency.

To calculate the heat capacity as a function of temperature using the Einstein model for a chosen metal, we need to make a few assumptions. Let's assume we are considering a metal such as copper (Cu) as an example. The Einstein model assumes that the atoms in the metal behave as harmonic oscillators with a characteristic frequency.

(a) Calculation and Graph:

The heat capacity as a function of temperature according to the Einstein model can be calculated using the following equation:

C_Einstein = 3Nk_B x (Einstein_T² x exp(Einstein_T) / (exp(Einstein_T) - 1)²)

Where:

C_Einstein is the heat capacity according to the Einstein model

N is the number of atoms in the metal (Avogadro's number x number of moles of the metal)

k_B is the Boltzmann constant

Einstein_T is the characteristic temperature of the metal in Kelvin (can be estimated using the characteristic frequency)

To generate a computer-generated graph, we need to plot the heat capacity as a function of temperature. We can vary the temperature over a suitable range and calculate the corresponding heat capacity using the Einstein model equation. The resulting graph will show how the heat capacity changes with temperature.

(b) Comparison with Expectations:

At low temperatures, the heat capacity according to the Einstein model approaches a constant value of 3Nk_B, which is the classical Dulong-Petit value for solids. This behavior is expected as the atoms in the metal are frozen in their vibrational motion.

At high temperatures, the heat capacity approaches the classical limit of 3R, where R is the molar gas constant. This is also expected as the vibrational modes of the atoms in the metal become fully excited and contribute to the heat capacity.

It's important to note that the Einstein model is a simplified model and assumes all atoms have the same characteristic frequency. In reality, the vibrational modes in a metal are more complex, and different atoms may have different frequencies. Additionally, the model neglects electronic contributions to the heat capacity, which can be significant in metals.

The comparison of the heat capacity obtained from the Einstein model at low and high temperatures with expectations will help us assess the agreement with what is expected. If the model predicts similar behavior to the Dulong-Petit value at low temperatures and approaches the classical limit at high temperatures, it suggests reasonable agreement with expectations. However, the actual heat capacity behavior of metals can be more complex and may deviate from the assumptions and predictions of the Einstein model.

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Chair flipping of cyclohexane with bulky t-butyl group leads to interconversion of axial and equatorial positions, causing a change in overall conformation.

What happens to the overall structure and position of t-butyl group during chair flipping of a cyclohexane?

When a bulky group such as t-butyl (tert-butyl) is present on a cyclohexane ring, it can cause steric hindrance in its axial position. As a result, the molecule undergoes a process called chair flipping, where the axial and equatorial positions of the substituents on the cyclohexane ring interchange.

During the chair flip, the t-butyl group moves from the axial position to the equatorial position or vice versa, depending on whether it was originally in the up or down position. This interconversion between the axial and equatorial positions of substituents leads to a change in the overall conformation of the molecule, causing it to adopt a different chair conformation.

In summary, when a bulky group like t-butyl is present on a cyclohexane ring, it undergoes chair flipping to reduce steric hindrance. During this process, the t-butyl group changes position from axial to equatorial or vice versa, leading to a change in the overall conformation of the molecule.

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Answer:

0.1 mole

Explanation:

According to the formula, 1 mol of CaCO3 will require 2 mol of HCl

Molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol

so the 5g of CaCO3 equals : 5g x (1 mol/100.09g) = 0.0499 or 0.05 mol

so the mole of HCl required is: 0.05 x 2 = 0.1 mol

The populations of axolotls that are raised in captivity are able to regrow limbs but those grown in the wild can not.

The axolotls are one of the populations of the organisms that are facing the threat of extinction. This implies that if nothing is seriously done to ensure that the populations do not go into extinction, they would all soon disappear from the face of the earth.

The response to this situation have been to ensure that the there is a conscious effort to make sure that the axolotls does not disappear from the face of the earth and most of this effort have been made by raising some populations in captivity. The populations raised in the wild are different from those raised in captivity.

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The order of the atoms from most positive overall charge to least positive overall charge is:  Atom B > Atom R > Atom A > Atom P.

What is the order of atoms?

To determine the order of the atoms from most positive overall charge to least positive overall charge, we need to compare the number of protons (positive charges) and electrons (negative charges) for each atom.

Atom R has 26 protons and 24 electrons. Therefore, it has a net positive charge of 2+.

Atom B has 24 protons and 19 electrons. Therefore, it has a net positive charge of 5+.

Atom A has 14 protons and 16 electrons. Therefore, it has a net negative charge of 2-.

Atom P has 8 protons and 11 electrons. Therefore, it has a net negative charge of 3-.

Therefore, the order of the atoms from most positive overall charge to least positive overall charge is:

Atom B > Atom R > Atom A > Atom P.

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Answer:

it is a nice question....my mind tells me that the first is it use me as a good vibes and can use to anything the second i will do my best too absorbe it.

Explanation:

Hope this help...

Answer:

Plastic is a insulator that is why it is used

Explanation:

So wires or metal is a conductor and if you put a conductor as coating then it will conduct plastic coating is for protection because it does not conduct electricity or let it pass through that is why you don't get shocked but if coating was metal then it would conduct and you would get shocked.

Answer:

plastics don't conduct any electricity whatsoever, so plastic is actually used in a wide variety of applications where their insulating, or "protecting" properties are needed. PVC is the most common insulator for electric wiring, I know, because my dad's friend works in electrical and that's what he mainly uses in his line of work, but anyway. yeah, so, plastic materials such as PVC also helps with the prevention of electrical shock. obviously if you were to touch a bare electrical wire you would either be in for a long hospital stay or a coffin. lol um so yeah materials such as PVC are very good and are always used in electrical wiring to not only prevent electrical shock, but to also to provide an insulator and is good for use in high temperatures.

~hope i helped uwu n have a nice rest of ur day~

lots of love,

    lee

Answer:

A liquid's boiling point (BP) is the temperature at which it transitions from a liquid to a gas phase. The BP of the liquid being distilled changes as the process continues during distillation.

A liquid mixture's initial BP should be lower than its final BP because the initial BP reflects the temperature at which the mixture's most volatile components evaporate and the final BP indicates the temperature at which the mixture's least volatile components vaporize.

The concentration of the more volatile components in the liquid mixture reduces as the distillation advances, which causes the BP to rise. This implies that the vapor generated has fewer volatile components and more of the less volatile components. Because the boiling points of the less volatile components are higher, the temperature of the vapor in the distillation apparatus must be raised to guarantee that these components also evaporate and are collected.

Explanation:

Examining the vapor-liquid equilibrium curve for the combination being distilled can help explain why the BP grows as the distillation advances. The connection between temperature and the composition of the vapor and liquid phases in equilibrium at a particular pressure is depicted by this curve.

The vapor generated at the start of the distillation has a high concentration of the more volatile components. As the distillation process advances, the concentration of these components in the liquid diminishes, causing the vapor's composition to shift towards the less volatile components.

The temperature at which the vapor is in equilibrium with the liquid changes as its composition changes. To evaporate the less volatile components with higher boiling points, the temperature must be raised. This implies that as the distillation advances, the BP of the mixture will rise, with the final BP denoting the temperature at which all of the components in the mixture have been vaporized and collected.

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As the distillation progresses, the boiling point (BP) should rise. The BP of a substance is the temperature at which its vapor pressure is equal to the atmospheric pressure.

When the distillation begins, the temperature at which the liquid begins to boil is known as the initial boiling point (IBP).The IBP for a mixture containing several liquids is typically lower than 100°C because the vapor pressure is generated from the liquid with the lowest boiling point. As the temperature rises, the vapor pressure of the other liquids in the mixture starts to rise as well, causing them to boil off. The temperature at which the last component boils off is known as the final boiling point (FBP). The FBP should be about 100°C since the atmospheric pressure is typically 1 atm or 760 mmHg. Therefore, the BP of a substance rises as distillation progresses.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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The pH of the 3.1 M HClO₂ solution is approximately 1.21

To calculate the pH of a 3.1 M HClO₂ solution with a Ka of 1.10×10⁻², you need to use the equilibrium expression and the formula pH = -log10[H₃O⁺].

1. Set up the equilibrium expression: Ka = [H₃O⁺][ClO₂⁻]/[HClO₂].

2. Since the initial concentration of H₃O⁺ and ClO₂⁻ is 0, and the change in their concentrations will be equal, we can represent their concentrations as x. The concentration of HClO₂ will be 3.1-x.

3. Replace the concentrations in the equilibrium expression: 1.10×10⁻² = x²/(3.1-x).

4. Make an assumption that x is much smaller than 3.1, so 3.1-x ≈ 3.1. Then, the expression becomes: 1.10×10⁻² ≈ x²/3.1.

5. Solve for x: x = √(1.10×10⁻² ×3.1) ≈ 0.0616 M, which represents [H₃O⁺].

6. Calculate the pH using the formula:

pH = -log10[H₃O⁺] = -log10(0.0616) ≈ 1.21.

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Answer:

b-acting as a standard unit of measure

Explanation:

Julie uses the mark for initially acting as a standard unit of measure. The correct option is b.

Recognizing and writing down an occurrence or fact is the process of observation, which frequently entails measuring it with tools. Utilizing tools for measurement is frequently required when recognizing and documenting an occurrence or fact. Written observations taken during or right after fieldwork are referred to as field notes.

They are essential for comprehending occurrences observed in the field. Scratch notes, diaries, and notebooks are common formats for field notes. The process of observation is essential in science. Snails are the molluscan. It comes under zoological study.

Therefore, the correct option is b. acting as a standard unit of measure

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The mass of the products form when baking soda decomposes is 25.00 grams

We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below

The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.

With the above information, we can detertmine the mass of the products obtained as follow:

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

Mass of reactant = Mass of product

Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)

25.00 g = 25.00 g

Thus, the mass of the products is 25.00 g

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Answer:

B

Mark as the Brainliest please

A Straight line sloping upward (atmospheric CO2 levels would not seasonally oscillate, but would have increased over time).

A straight line up the graph means it has a positive slope, meaning that even though atmospheric carbon dioxide levels would not oscillate through the seasons, in this case in tropical environments in the northern and southern hemisphere Earth, that is, the climate close to the equator, the positive slope indicates that carbon dioxide levels would increase over time.

Photosynthesis is the process through which green plants and certain other organisms make their food using carbon dioxide and water in the he presence of Sunlight.

During photosynthesis, energy conversion from light energy into chemical energy takes place.

Photosynthesis is one of the major processes that helps to eliminate and reduce the quantity of carbon dioxide in the atmosphere,it also serve to make oxygen present in the atmosphere.

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Answer:

For balancing this equation

we need to put

Ag2O. = 2

Ag = 4

O2 = 1

Hope it will help

The balanced chemical equation of decomposition of silver oxide is 2 Ag₂O -> 4 Ag + O₂.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The actual value of the van't Hoff factor, i, is 2, as KNO₃ dissociates into two ions (K+ and NO₃-) in solution.

To calculate the grams of KNO₃ needed to produce a solution that freezes at -14.5 °C, we can use the formula:

ΔT = Kf * m * i

where ΔT is the change in freezing point, Kf is the molal freezing point depression constant, m is the molality of the solution, and i is the van't Hoff factor.

First, let's calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

Since we have 275 mL of water, which is equivalent to 0.275 L, and assuming water has a density of 1 g/mL, the mass of the solvent is 0.275 kg.

To determine the moles of solute, we need to use the equation:

ΔT = Kf * m * i

Substituting the given values:

-14.5 °C = (1.86 °C/m) * m * i

Solving for m * i:

m * i = -14.5 °C / (1.86 °C/m)

m * i = -7.80 m

Since KNO₃ dissociates into K+ and NO₃- ions, the van't Hoff factor (i) is 2.

Now we can solve for the molality of the solution (m):

m * i = -7.80 m

2m = -7.80 m

m = -7.80 m / 2

m = -3.90 m

Finally, we can calculate the moles of KNO₃:

moles of solute = m * mass of solvent (in kg)

moles of KNO₃ = (-3.90 m) * 0.275 kg

To convert moles to grams, we multiply by the molar mass of KNO₃, which is approximately 101.1 g/mol.

grams of KNO₃ = moles of KNO₃ * molar mass of KNO₃

Therefore, the number of grams of KNO₃ required to produce the solution is:

grams of KNO₃ = (-3.90 m) * 0.275 kg * 101.1 g/mol

The actual value of the van't Hoff factor, i, is 2, as KNO₃ dissociates into two ions (K+ and NO₃-) in solution.

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1 is the answer cuz why not

Answer:Poking a metal rod into an electrical socket.

Explanation:

It is because metal rod can conduct electricity easily. So while poking, the metal rod will conduct electricity and you will get an electrical shock.

Answer:

Explanation:

A. Tabular form of the formation of the compound formed between X and Y (carbon and oxygen):

| Element | Electronic Configuration |

|---------|-------------------------|

| X       | 1s² 2s² 2p⁶ 3s²        |

| Y       | 1s² 2s² 2p⁶ 3s² 3p⁵   |

B. Formation of the compound:

The compound formed between X and Y is carbon dioxide (CO2). Carbon (X) has an electronic configuration of 1s² 2s² 2p⁶ 3s², and oxygen (Y) has an electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁵.

Carbon has 4 valence electrons in its outermost energy level, while oxygen has 6 valence electrons in its outermost energy level. In order to achieve stability, carbon needs to gain 4 electrons, while oxygen needs to gain 2 electrons.

To form the compound CO2, carbon will share electrons with two oxygen atoms. Carbon will share 2 electrons with each oxygen atom, resulting in a double bond between carbon and each oxygen atom.

The formation of the compound can be represented as follows:

O = C = O

2. Drawing the formation of the compound:

In text format, the formation of the compound CO2 can be represented as:

     O

    //

   C

    \\

     O

Here, the central carbon atom (C) is bonded to two oxygen atoms (O) through double bonds. The structure of carbon dioxide is linear, with the carbon atom in the center and the oxygen atoms on either side.

Geochemical cycles include all of the following options given in the question. Chemical weathering of feldspar release potassium. Atmospheric precipitation creates surface runoff which can transport dissolved trace elements.

The formation of limestone which involves carbon cycle.

Calcium carbonate precipitated on the oceanic crust can be subducted and melted as a magma composition.

The chemical reaction in which the minerals of rocks and soils are broken down by the process of oxidation, hydration, hydrolysis and carbonation, resulting in the release of essential nutrients, is known as weathering.

The potassium which is released during chemical weathering of feldspar is one of the important nutrient required for plants.

Trace elements, including heavy metals like lead and mercury, are transported in surface runoff water during the process of atmospheric precipitation.

Limestone is formed from the shells of marine organisms that contain calcium carbonate. Calcium carbonate is dissolved in the ocean water, where it precipitates to form limestone.

During subduction, calcium carbonate precipitated on the oceanic crust is transported to deeper depths where it is subjected to high pressures and temperatures.

It gets melted and forms magma.

Hence, the correct option is E. All of the above.

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Answer: I do believe it shows variables.

Explanation:

Answer:

The correct answer is b

Explanation:

Answer:

Correct Answer is (B)

Explanation:

Got it right on plato Chemistry Post test

Hope I helped you out :)

The possible values of the quantum numbers are:

Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.

Magnetic quantum number m: -l to +l.

Spin quantum number, s: +1/2 or -1/2.

For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.

The magnetic quantum number m can have values ranging from -l to +l, inclusive.

The spin quantum number, s can be either +1/2 or -1/2.

So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:

Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.

Magnetic quantum number, m can range from -l to +l, inclusive.

Spin quantum number, s can be either +1/2 or -1/2.

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Answer:

See explanation

Explanation:

We separate substances based on their important properties such as reaction to heat, solubility in water, magnetic properties, etc.

To separate sodium chloride and potassium trioxonitrateV, we need to heat the solution. KNO3 dissolves at a high temperature and crystallizes out as the solution is cooled.

Hence when we heat the solution, KNO3 dissolves, as we cool the solution, solid KNO3 crystals are obtained while NaCl remains in solution.  We have now separated the two salts in the solution.

Note that the solubility of NaCl is almost independent of temperature.