Rubbing alcohol is less polar than water. Both are liquids at room temperature which One boils first? why?

Answer:

sodium

Explanation:

Answer:

0.645 liters

Explanation:

THE QUESTION IS equivalent 0.645 Liters

Answer:

Potassium bromide is a strong electrolyte as it can be entirely disassociated in aqueous solution. The problem with this question is that you can't really have an aqueous solution of calcium oxide, CaO, because this compound will react with water to form calcium hydroxide, Ca(OH)2. Keep in mind that this reaction is highly exothermic!

Explanation:

Elements are held together (joined) by a chemical bond. These bonds differ with the property of the element. Metals usually bond by transfer of electrons whereas metalloids usually share electrons to make a bond.

Answer:

My guess is A.

Explanation:

The electron transport chain is the sequence involving the complexes undergoing redox reactions. The enzyme in complex II of ETC, succinate dehydrogenase is also involved in the TCA cycle.

The TCA is abbreviated for tricarboxylic acid also called citric acid or Krebs's cycle. It is a part of aerobic respiration that provides energy for cells. It involves a series of chemicals and reactions that are involved in releasing stored energy.

The complex II of the ETC cycle called succinate reductase contains a succinate dehydrogenase enzyme that is also involved in the TCA cycle for transforming succinate into fumarate and results in FADH₂.

Therefore, succinate dehydrogenase is an enzyme of ETC involved in TCA.

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Absolute zero is defined as the theoretically lowest attainable temperature, which is -273.15 K or 0 degrees Celsius.

Absolute zero is the temperature at which the particles of a substance have minimum kinetic energy, and hence, the substance has minimum internal energy. This temperature is the lower limit of the thermodynamic temperature scale, and it is denoted as 0°C (-273.15 Kelvin).

Absolute zero is equivalent to -273.15 K or 0 degrees Celsius, which is the point at which all molecular motion ceases. It is impossible to reach absolute zero in practice, although scientists have been able to cool certain substances to within a few billionths of a degree of it.

Therefore the answer is the lowest attainable temperature, which is -273.15 K.

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The compound most likely to dissolve in hexane, a nonpolar organic liquid, is Vitamin K (C31H42O2). Hexane is a nonpolar solvent, meaning it does not have a significant polarity or ability to form hydrogen bonds. Therefore, compounds that are nonpolar or have similar nonpolar characteristics are more likely to dissolve in hexane.

Sugar (C6H12O6) and water, on the other hand, are polar compounds. Sugar has many hydroxyl (-OH) groups, which contribute to its polarity, while water is a highly polar molecule due to its bent shape and oxygen's strong electronegativity. Hexane, being nonpolar, does not have the ability to effectively solvate or interact with these polar compounds, resulting in low solubility.

Ethanol, although partially polar due to the presence of the hydroxyl group (-OH), has a significant nonpolar component. As a result, ethanol has some solubility in both polar and nonpolar solvents. However, its polar characteristics may limit its solubility in a purely nonpolar solvent like hexane.

In summary, among the given options, Vitamin K (C31H42O2) is most likely to dissolve in hexane due to its predominantly nonpolar nature, while sugar, water, and ethanol are less likely to dissolve to a significant extent in hexane due to their polar characteristics.

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Answer:

0.72 good luck with the answer

AgNO₃ will act as the oxidising agent.

Cu + 2AgNO₃ →  2Ag + Cu(NO₃)₂

Half reactions for the given chemical reaction:

Reducing agent:

Cu → Cu²⁺ + 2e⁻

Copper is a reducing agent because it is losing 2 electrons, which causes an oxidation process.

Oxidising Agent:

Ag⁺ + e⁻ → Ag

The silver ion undergoes a reduction process and is regarded as an oxidizing agent since it is acquiring one electron per atom.

Hence, AgNO₃ is considered as an oxidizing agent and therefore the correct answer is Option B.

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Answer:

588 mole

29.4

+29.4

5 8. 8g

Among the 4 given statements, option D: The value of Kw shows that water is a weak acid is the incorrect statement. Kw is ion product constant.

The ion product constant (Kw) is the product of the concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in aqueous solution. It is used to measure the acidity or basicity of a solution, with a Kw of 1.0 x 10⁻¹⁴ at 25 °C for pure water. The value of Kw changes with temperature and is a measure of the strength of the solvent, indicating whether it is a stronger acid or base.

The value of Kw (ion product constant for water) is a measure of the strength of the self-ionization of water, which can be represented by the equation H2O ⇌ H⁺ + OH⁻. The fact that Kw has a very small value (1.0 × 10⁻¹⁴) indicates that the self-ionization of water is a very weak reaction.

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The partial pressure of O₂ from daniel's 2.5L bottle that contains a mixture of O₂, N₂ and CO₂ under a total pressure of 5.10 atm is 2.171atm.

In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature.

How to calculate the partial pressure of O₂?

Volume (V) = 2.5L

T = 273K

o₂ + N₂ + CO₂ ---> Total pressure P = 5.1atm

N₂ = 0.31 mol

Partial pressure CO₂ = 0.25atm

R = 0.0821L (ideal gas constant with given volume in L and temperature in K)

P*V = n*R*T

n = P*V / R*T

= (5.1 * 2.5) / (0.0821 * 273)

= 12.75 / 22.4133

= 0.56886 mole

Partial pressure of N₂

= mol fraction * Total pressure

= (0.31 / 0.56886) * 5.1

= 2.779atm

Total pressure

P = P O₂ + P N₂ + P CO₂

5.2 = P O₂ + 2.779 + 0.25

P O₂ = 5.2 - 2.779 - 0.25

P O₂ = 2.171atm

Therefore, the partial pressure of O₂ is 2.171atm.

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The given statement "all electrons present in a material are available to participate in the conduction process." is false because not all electrons in a material are free to move and participate in conduction.

In a material, there are two types of electrons: valence electrons and conduction electrons. Valence electrons are the electrons in the outermost shell of an atom and are involved in chemical bonding. Conduction electrons, on the other hand, are free electrons that are able to move through the material and participate in the conduction process.

However, not all electrons in a material are free to move and participate in conduction. Some electrons may be bound to individual atoms or may be involved in covalent or ionic bonds, and are not free to move. Therefore, only a subset of the electrons in a material are available to participate in the conduction process.

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Answer:

The reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.

Explanation:

The reaction of chlorine with sodium can produce sodium chloride (NaCl), which is also known as table salt. To determine how many grams of NaCl can be produced by this reaction, we need to know the molar mass of NaCl and the number of moles of chlorine that are reacted.

The molar mass of NaCl is 58.44 g/mol. This means that 1 mole of NaCl has a mass of 58.44 grams.

To find the number of moles of chlorine that are reacted, we need to convert the volume of chlorine from cubic centimeters (cm³) to liters, and then use the ideal gas law to calculate the number of moles. At standard temperature and pressure (STP), 1 mole of any gas occupies a volume of 22.4 liters. Therefore, the number of moles of chlorine can be calculated as follows:

moles = (volume of chlorine at STP) / (volume of 1 mole of any gas at STP)

In this case, the volume of chlorine is 112 cm³, which is equivalent to 0.112 liters at STP. Therefore, the number of moles of chlorine can be calculated as follows:

moles = 0.112 liters / 22.4 liters/mol

This gives a result of 0.005 moles of chlorine.

Since the reaction produces an excess of sodium, we can assume that all of the chlorine that is reacted is converted into NaCl. Therefore, the mass of NaCl that is produced can be calculated by multiplying the number of moles of chlorine by the molar mass of NaCl:

mass = (number of moles) * (molar mass of NaCl)

In this case, the mass of NaCl that is produced is 0.005 moles * 58.44 g/mol = 0.292 grams.

Therefore, the reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.

The calculated molar ratio of iron to oxygen in BIFs is 1.452.

Comparing this ratio to the molar ratios of Hematite (1:0.75) and Magnetite (1:0.67), we can see that the calculated value of 1.452 is closest to the Hematite molar ratio of 1:0.75. Therefore, Hematite is the more dominant iron component in BIFs.

To calculate the mass of oxygen contained within BIFs, we'll use the given information:

Total mass of the modern atmosphere = 5.01×10¹⁸ kg

Percentage of oxygen in the modern atmosphere = 21%

Mass of oxygen contained within the modern atmosphere = (5.01×10¹⁸ kg) × (0.21) = 1.051×10¹⁸ kg

Percentage of oxygen contained in BIFs = 6.6% (given)

Mass of oxygen contained within BIFs = (6.6% of 1.051×10¹⁸ kg) = 6.6/100 × 1.051×10¹⁸ kg = 6.9166×10¹⁶ kg

Therefore, the mass of oxygen contained within BIFs is 6.9166 × 10¹⁶ kg.

To calculate the number of moles of oxygen contained within BIFs, we'll use the molecular mass of O₂:

Molecular mass of O₂ = 0.032 kg/mole

Number of moles of oxygen contained within BIFs = (Mass of oxygen in BIFs) / (Molecular mass of O₂)

= (6.9166×10¹⁶ kg) / (0.032 kg/mole) = 2.1614375 × 10¹⁸ moles

Therefore, the number of moles of oxygen contained within BIFs is 2.1614375 × 10¹⁸ moles.

Next, let's calculate the mass of iron in BIFs:

Total mass of BIFs = 5.0×10¹⁷ kg

Percentage of iron in BIFs = 35%

Mass of iron contained within BIFs = (35% of 5.0×10¹⁷ kg) = 35/100 × 5.0×10¹⁷ kg = 1.75×10¹⁷ kg

To calculate the number of moles of iron contained within BIFs, we'll use the atomic mass of iron:

Atomic mass of iron = 0.0558 kg/mole

Number of moles of iron contained within BIFs = (Mass of iron in BIFs) / (Atomic mass of iron)

= (1.75×10¹⁷ kg) / (0.0558 kg/mole) = 3.1367419 × 10¹⁸ moles

Therefore, the number of moles of iron contained within BIFs is 3.1367419 × 10¹⁸ moles.

Finally, let's calculate the molar ratio of iron to oxygen in BIFs:

Molar ratio of iron to oxygen = (Number of moles of iron) / (Number of moles of oxygen)

= (3.1367419 × 10¹⁸ moles) / (2.1614375 × 10¹⁸ moles)

≈ 1.452

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Answer:

What is the specific heat for the aluminum wire?

0.82

What is the specific heat for the steel wire?

0.47

What is the specific heat for the lead pellets?

0.25

Explanation:

Answer:

What is the specific heat for the aluminum wire?

0.82

What is the specific heat for the steel wire?

0.47

What is the specific heat for the lead pellets?

0.25

Explanation:

This is the person above me. All credits go to them.

For the harvesting of salt from seawater, solar energy is used. To evaporate seawater, solar energy is used. As the concentration of the salt increases, it crystallizes.

Renewable energy is defined as energy derived from natural sources that is replenished at a faster rate than it is consumed.

Sunlight and wind are two examples of such constantly replenishing sources. Renewable energy sources are plenty and are all around us.

Solar energy is utilized to get salt from seawater. Solar energy is used to evaporate seawater. The salt crystallizes as its concentration increases.

Thus, this way, salt extraction can be done using a common renewable energy source.

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Answer:

B

Explanation:

The answer is sunlight solar cells directly convert the sunlight into electricity

Answer:

B

Explanation:

Sunlight, or solar energy is the type of energy which is not used by a turbine to generate electricity.

Answer:

En verdad solo el 0,025% del agua de la tierra es dulce

Explanation:

Answer:

3.Test for unsaturation is carried out by either Baeyer's test or bromine water test.

(a) What is Baeyer's reagent?

Ans:

Baeyer's reagent is an alkaline solution of Potassium Permanganate \(\bold{KMnO_4}\) .

(b) How does it detect presence of double bond in organic compound? Write the reaction involved.

Ans:

When a dilute alkaline solution of \(\bold{KMnO_4}\) is added to the given unsaturated organic compound, if the purple color of permanganate solution disappears, the presence of double bond is indicated.

For example:

2\(\bold{KMnO_4}\) + 2KOH \(\longrightarrow\)\(\bold{2K_2MnO_4 + H_2O+[O]}\)

\(\bold{CH_2=CH_2(ethene) +H_2O+[O]\longrightarrow CH_2OH-CH_2OH (ethylene \:glycol :Colourless)}\)

(c) Write the product when ethyne is treated with Baeyer's reagent.

Ans:

Product will not produce as ethyne doesn't contain double bond.

(d) Benzene (an aromatic hydrocarbon) does not give Baeyer's test though it has double bonds. Why?

Ans:

As Benzene is an unsaturated compound. The structure of benzene contains 3 alternate single double bonds.

(e) Write the reaction for bromine water test for ethyne.

Ans:

Reaction:

\(\bold{CH_2CH_2(ethene)+Br_2( red \: color) \longrightarrow CH_2Br-CH_2Br}\)  

(1,2-dibromoethane (colorless}

Kolbe electrolytic method can be used to prepare alkane, alkene and alkyne.

(a) At which electrode, alkane, alkene or alkyne is obtained?

Ans:

alkane, alkene or alkyne is obtained at anode.

(b) Which electrolyte should be chosen for alkane, alkene or alkyne for the method? Suggest an example of electrolyte for each.

Ans:

alkane: Potassium or sodium salt of Carboxylic acid

alkene: Potassium or sodium salt of dicarboxylic acid

alkyne: Potassium or sodium maleate

(c) If potassium salt of dicarboxylic acid is taken for the method, which hydrocarbon is prepared?

Ans: If potassium salt of dicarboxylic acid is taken for the method, Alkene hydrocarbon is prepared.

(d) Write the detail process for the electrolysis of aqueous potassium maleate.

Ans: Attachment

(e) Suggest a demerit of the method.

Ans:

Demerits:

Among all the given options Washing the dishes is not a spontaneous process.

Spontaneous processes occur naturally and do not require any external input of energy or effort to take place. The other three processes listed are spontaneous because they occur naturally without any external intervention.

When an Alka-Seltzer tablet dissolves in water, the tablet breaks down and mixes with the water due to the natural movement of molecules from higher concentration to lower concentration, which is known as diffusion.

Similarly, when Kool-Aid dye mix is added to water, the dye particles spread out and mix with the water molecules spontaneously.

Automobile rusting is also a spontaneous process because it occurs due to the natural reaction between iron and oxygen in the presence of moisture.

However, washing the dishes is a non-spontaneous process because it requires external energy input in the form of mechanical work to clean the dishes. Without any external intervention, the dishes would not clean themselves.

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Chiral molecules: L-alanine, D-glucose, S-ibuprofen.

Achiral molecules: Ethanol, methane, benzene.

Chiral molecules are those that possess a non-superimposable mirror image. They have an asymmetric carbon atom or a chiral center. Examples of chiral molecules include L-alanine, D-glucose, and S-ibuprofen.

Achiral molecules, on the other hand, lack a chiral center and have a superimposable mirror image. They possess symmetry elements that allow their mirror images to overlap. Examples of achiral molecules include ethanol, methane, and benzene.

The classification of a compound as chiral or achiral depends on its molecular structure and the presence or absence of a chiral center. A chiral center is a carbon atom bonded to four different substituents. If a molecule has one or more chiral centers, it is chiral; otherwise, it is achiral.

The concept of chirality is crucial in organic chemistry and biochemistry. Chiral molecules have unique properties and can exhibit different biological activities due to their ability to interact selectively with other chiral molecules, such as enzymes and receptors. Understanding the chirality of molecules is important in drug design, as enantiomers (mirror image isomers) of a chiral drug may have different pharmacological effects. Additionally, chirality plays a significant role in the study of stereochemistry and the understanding of molecular structures and properties. It is essential to consider the chirality of molecules in various fields, including pharmaceuticals, materials science, and chemical synthesis.

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Cool the bauxite complex to allow the aluminum hydroxide to precipitate.Dissolve the aluminum oxide in molten cryolite. Separate the aluminum from the oxide by electrolysis in an electrolytic cell.

A trained electrologist inserts a short wire into the hair follicles that are located at the skin's surface. An electric current that exits the follicle and travels down the wire damages the hair root. Damage to the follicles prevents the growth of new hair and causes the existing hair to fall out.

The main industrial procedure for smelting aluminum is called the Hall-Héroult process. It entails dissolving aluminum oxide (alumina), which is most frequently derived from bauxite, the primary ore of aluminum, using the Bayer process, in molten cryolite, and electrolyzing the molten salt bath, usually in a cell that has been specifically designed for the purpose.

Mix the bauxite ore with concentrated sodium hydroxide to form sodium aluminum hydroxide complex.

Heat the Al(OH)3 to drive off water, leaving Al2O3.

Filter out the sodium aluminum hydroxide complex to allow the aluminum hydroxide to precipitate.

Electrolyze the aluminum oxide in the presence of cryolite in an electrolytic cell.

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Answer:

Sulfide

Explanation:

ide --> ate

correct spelling is sulfate

Moving hot food in a covered pan to a cooler space, such as a storage room, or submerging it in ice water, is another option. Ice can also be used to hasten the cooling process.

Soups can be chilled by submerging them in cold water. This technique aids in a swift and secure drop in food temperature. To make a slush, put some ice in a big container or sink and add some water. After that, put the plate of food to be chilled into the ice bath. bathing in ice water and stirring the food often.Food is stirred with ice paddles, which are plastic containers that have been frozen after being filled with water.using ice as a component (if water is an ingredient).chiller that jars or tumbles.

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Heterogeneous 'mixtures' (because they don't meet the definition  of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.

Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.

Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.

Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.

Answer: Electron

Explanation:An electron is most likely to be found in an energy level within an atom.

Answer:

STANDARD: 0.085 mi, 450 ft, or 150 yds

METRIC: 0.137 km, 137.16 m, or 13716 cm

Explanation:

The moles of water produced from 3.07 mol of H2O2 are 64.47 moles. Answer: 64.47

Part A Given the following decomposition reaction, calculate the moles of water produced from 3.07 mol of

H2O2.2 H2O2(1) → 42 H2O(l) + O2(g)

Molar ratio between H2O2 and

H2O is 2:42 or 1:21.

Therefore, moles of water produced from 3.07 mol of H2O2 is:

Moles of water produced = Moles of H2O2 × 21/1 = 3.07 × 21 = 64.47 (approx)

Therefore, the moles of water produced from 3.07 mol of H2O2 are 64.47 moles.

Answer: 64.47

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Expressing the answer with the appropriate units, we have:

3.07 moles of water.

Moles of water: Moles of a substance are a measure of the amount of that substance present. It is a unit used in chemistry to quantify the number of particles (atoms, molecules, or ions) in a sample.

The balanced equation for the decomposition reaction of hydrogen peroxide \(\rm(H_2O_2)\) is: \(\rm\[2H_2O_2(\ell) \rightarrow 2H_2O(\ell) + O_2(g)\]\)

According to the stoichiometry of the reaction, for every 2 moles of \(H_2O_2}\) consumed, 2 moles of \(H_2O\) are produced.

To calculate the moles of water \((H_2O)\) produced from 3.07 moles of \(H_2O_2\), we can set up a ratio: (3.07 moles \(\rm H_2O_2\)) x (2 moles \(\rm H_2O_\) / 2 moles \(\rm H_2O_2\)) = 3.07 moles \(\rm H_2O\)

Therefore, from 3.07 moles of \(\rm H_2O_2\), 3.07 moles of \(\rm H_2O\) are produced.

Thus, Expressing the answer with the appropriate units, we have:

3.07 moles of water.

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