6. A student adds a mixture of oil, sand and salt in a beaker of water and stirs it. The student stops stirring, and observes that the salt is no longer visible. It is also observed that the oil floats on the top and the sand sinks to the bottom of the beaker.
a. Why does oil float on water?
b. Why is salt no longer visible after the stirring?
c. How can you separate the components of this mixture?​

Answer:

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.

Explanation:

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For every 60 grammes of ethane, 108 grammes of water are produced. We therefore obtain 10.8 g of water from the combustion of 6 g of ethane. As a result, is created in 0.6 moles.

The mole fraction of the solvent must be multiplied by the partial pressure of the solvent in order to determine an ideal solution's vapour pressure. The vapour pressure would be 2.7 mmHg, for example, if the mole fraction is 0.3 and the partial pressure is 9 mmHg.

One mol of the solute is contained in one thousand grammes of the solvent (water) in a one molal solution. It follows that the solution's vapour pressure is 12.08 kPa.

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Answer:

Since AlCl3 sublimes and NaCl does not sublime sublimation process will separate the two. Heat the mixture, aluminium chloride sublimes into vapour and forms the sublimate on the cooler parts of heating tube sodium chloride will remain at the bottom of the heating tube.

Explanation:

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This reddish-brown irritating gas that gives photochemical smog its brownish color and is also a major component of acid deposition is Nitrogen dioxide (NO2).

Nitrogen dioxide (NO2) is a reddish-brown gas that is a photochemical smog component. It's also a component of acid deposition when it's converted to an acid in the atmosphere. Nitrogen dioxide (NO2) is one of the major air pollutants that contribute to the formation of smog. It's generated from the burning of fossil fuels, particularly in high-temperature combustion processes that produce smog.

Nitrogen dioxide is formed when nitrogen in the atmosphere reacts with oxygen in the atmosphere.Nitrogen dioxide is one of the primary pollutants produced by motor vehicle exhausts. When nitrogen oxide (NO) and volatile organic compounds (VOCs) are released into the atmosphere by burning fossil fuels, they react with sunlight to create photochemical smog. Nitrogen dioxide, a secondary air pollutant, is produced as a result of this reaction. Nitrogen dioxide (NO2) is a reddish-brown gas that absorbs light at wavelengths below 400 nanometers, giving photochemical smog its brownish color.

Nitrogen dioxide (NO2) is a major component of acid deposition when it is converted in the atmosphere into an acid. Acid deposition is a type of precipitation that contains acidic substances, such as sulfuric acid and nitric acid. When acid deposition falls to the ground, it can cause damage to plant and animal life, as well as buildings and other structures.

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Chromatography can be used to separate chlorophyll into a variety of pigment colours.

The leaf contains the chlorophyll molecule, which can be isolated using paper chromatography. Based on the distance that pigment molecules on the paper in a nonpolar solvent travelled, the paper chromatography separates the pigments in the leaf.

During paper chromatography, pigments separate because of their various polarity. Being polar, cellulose interacts more with polar pigments than non-polar pigments. Capillarity and absorbance are essential for chromatography.

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Question:

Using chromatography you can separate chlorophyll into several different pigment colors. Which statement is true about chlorophyll in this context, and what is its role in photosynthesis?

Answer:

25-54-46-36 619-73 77-88-50

Based on the given options, the anion of the unknown salt could be either Br− (bromide), CO₃²⁻ (carbonate), or NO₃⁻ (nitrate). These are all common anions found in various salts. To determine the specific anion in the unknown salt, further tests or analysis would be required.

Each anion has different properties and characteristics that could give clues as to which one is present in the salt, but it ultimately depends on the specific circumstances and conditions.

For example, if the salt is soluble in water, the anion could be determined through a series of chemical tests or by measuring the electrical conductivity of the solution. If the salt is insoluble, additional tests such as flame tests or precipitation reactions could be used to identify the anion.

It is also important to consider the cation present in the unknown salt, as different cations can react differently with certain anions. For instance, if the cation is a transition metal, it is more likely to form a complex ion with the anion than if it were an alkali metal.

Overall, determining the anion of an unknown salt requires careful observation and analysis, as well as knowledge of chemical properties and reactions.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer:

VC = 18

Explanation:

Since L is the midpoint and you have LV, you know that LC is also 9.

the use of NaOH solution in extraction procedures can help to adjust the pH of the solution, enhance the solubility of organic compounds in the aqueous layer, and help to separate different compounds based on their relative solubilities.

NaOH (sodium hydroxide) solution is often used in extraction procedures to adjust the pH of the solution and to make the organic compounds more soluble in the aqueous layer.

When an organic compound is mixed with water, it may dissolve partially or not at all due to differences in polarity between the two substances. By adjusting the pH of the solution with NaOH, the organic compounds can become more soluble in the aqueous layer because the addition of a basic solution can convert acidic functional groups in the organic compound to their conjugate bases. For example, carboxylic acids (an acidic functional group commonly found in organic compounds) can be converted to their water-soluble carboxylate salt forms by the addition of a basic solution such as NaOH.

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Answer:

clastic, organic, and chemical

Answer:

its 24 cuz 13 + 11 =24. you're still walking 24 km in all. your going _|

Possible conversion factors for feet and yards are:

To complete the unit conversion:

36 ft x 1 yd/3 ft = 12 yd

To determine conversions between two units of measurement, you need to use conversion factors. A conversion factor is a ratio of two equivalent values expressed in different units.  For example, 1 meter is equivalent to 3.281 feet.

To convert a value from one unit to another, you multiply the value by the appropriate conversion factor.

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The enzyme β-ketothiolase cleaves off the acetyl-CoA molecule from the 3-ketoacyl-CoA, releasing acetyl-CoA and the remaining fatty acid chain forms acyl-CoA, which is two carbons shorter than the original fatty acid chain.

The complete reaction scheme for the catabolism of Oleoyl-CoA is given below:Oleoyl-CoA is broken down into acetyl-CoA, releasing 150 ATP molecules by the process of Beta-oxidation. The complete reaction scheme for the catabolism of Oleoyl-CoA is given below:

Step 1: Oleoyl-CoA is transported to the mitochondria matrix from the cytoplasm with the help of the carnitine shuttle system.

Step 2: The enzyme Acyl-CoA dehydrogenase catalyzes the removal of two hydrogen atoms from the alpha and beta carbons in the fatty acid chain and oxidizes it. This process forms a double bond between the alpha and beta carbon atoms, leading to the formation of trans-Δ2-enoyl-CoA.

Step 3: The enzyme enoyl-CoA hydratase adds a water molecule to the trans-Δ2-enoyl-CoA, converting it into L-3-hydroxyacyl-CoA.

Step 4: The enzyme L-3-hydroxyacyl-CoA dehydrogenase oxidizes L-3-hydroxyacyl-CoA, releasing a hydrogen ion (H+) and two electrons (2e-) and converts it into 3-ketoacyl-CoA.

Step 5: The enzyme β-ketothiolase cleaves off the acetyl-CoA molecule from the 3-ketoacyl-CoA, releasing acetyl-CoA and the remaining fatty acid chain forms acyl-CoA, which is two carbons shorter than the original fatty acid chain.

The cycle starts again, and this process is repeated until the fatty acid chain is completely degraded.

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Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.

Explanation: please mark as brainliest

Answer:

Tipo de enlace enlace en CO2 - Covalente

Tipo de enlace enlace en KCl - iónico

Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno

Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1

Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4

Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4

Explanation:

Tipo de enlace enlace en CO2 - Covalente

Tipo de enlace enlace en KCl - iónico

Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno

Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1

Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4

Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4

(a) When the density of gold is 19.32 g/\(cm^{3}\) than area of the gold leaf is approximately 0.4386 cm².

(b) The length of the gold fiber is given by h = 0.4386 cm³ / (π * (2.500 × 10⁻⁴ cm)²).

To solve these problems, we can use the formula for the volume of a shape and the given density of gold.

(a) To find the area of the leaf, we can use the formula for the volume of a rectangular shape: V = A * h, where V is the volume, A is the area, and h is the thickness.

Given the mass of gold (m = 8.489 g) and density (ρ = 19.32 g/cm³), we can find the volume: V = m / ρ.

Substituting the values, we have V = 8.489 g / 19.32 g/cm³ = 0.4386 cm³.

Since the leaf is pressed into a thin shape, we can assume it has a rectangular shape, and the volume is approximately equal to the area: A ≈ V = 0.4386 cm².

(b) To find the length of the fiber, we can use the formula for the volume of a cylindrical shape: V = π * r² * h, where V is the volume, r is the radius, and h is the length.

Given the mass of gold (m = 8.489 g) and density (ρ = 19.32 g/cm³), we can find the volume: V = m / ρ.

Substituting the values, we have V = 8.489 g / 19.32 g/cm³ = 0.4386 cm³.

The volume of a cylinder is also equal to the product of the cross-sectional area (π * r²) and the length (h), so we have: π * r² * h = 0.4386 cm³.

Substituting the radius (r = 2.500 μm = 2.500 × 10⁻⁴ cm), we can solve for the length: h = 0.4386 cm³ / (π * (2.500 × 10⁻⁴ cm)²).

To summarize:

(a) The area of the gold leaf is approximately 0.4386 cm².

(b) The length of the gold fiber is given by h = 0.4386 cm³ / (π * (2.500 × 10⁻⁴ cm)²).

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Answer:

D. 9.0x10²³ atoms

Explanation:

First we use Avogadro's number to calculate how many molecules of Si₂H₆ are there in 0.75 mol:

There are 2 Si atoms in one Si₂H₆ molecule, that means that in 4.52x10²³ Si₂H₆ molecules there will be:

Thus the answer is option D.

Answer:

The Etna volcano when it previously erupted released a lot of smoke, and then volcanic lava.

Explanation:

The eruption of this volcano was on the Italian island of Sicily.

Where there were large columns of smoke and after that the volcanic magma in a viscoelastic state was released into the external environment.

Some sources claim that the eruption of this volcano reached the areas of Zaffanera.

Answer:

I think it's the A one. Hope it's correct

Answer:

A option is correct

Explanation:

Answer:

protein sysnthesis

Explanation:

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

The pH of a solution depends on the concentration of hydrogen ions (H+) in the solution. The higher the concentration of H+ ions, the lower the pH, and vice versa. Salts that produce basic solutions when dissolved in water are called basic salts. These salts contain cations (positively charged ions) of weak bases and anions (negatively charged ions) of strong acids.

To determine which salt produces the solution with the highest pH, we need to identify the salt that contains the cation of the weakest base. For example, the salt sodium acetate (NaCH3COO) produces a basic solution because the acetate ion (CH3COO-) is the conjugate base of a weak acid (acetic acid).

Therefore, the salt that produces the solution with the highest pH is the one that contains the cation of the weakest base. Examples of such salts include sodium carbonate (Na2CO3) and sodium hydroxide (NaOH).

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Regarding Louis Pasteur's experiments with the S-neck flask, the true statement is "Louis Pasteur's experiments with the S-neck flask demonstrated that microorganisms in the air were responsible for contaminating and spoiling substances, thus supporting the germ theory of disease."


1. Pasteur designed an S-neck flask, which had a curved neck that prevented airborne microorganisms from easily entering the flask.
2. He boiled broth in the flask to sterilize it, killing any existing microorganisms.
3. As long as the S-neck remained intact, the broth stayed free of contamination, proving that microorganisms didn't spontaneously generate in the broth.
4. When he broke the neck of the flask, allowing air and microorganisms to enter freely, the broth became contaminated, showing that microorganisms from the air were responsible for the spoilage.

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The total number of electrons and protons (in order) for O2- is 10 electrons and 8 protons.

How many electrons and protons does O2- have in total?

O2- is an oxygen ion that has gained two extra electrons, giving it a net negative charge. Oxygen typically has eight protons in its nucleus and eight electrons in its neutral state. However, with the addition of two electrons, the total number of electrons becomes 10 while the number of protons remains the same at eight.

The overall negative charge of O2- indicates that there are now more negatively charged electrons than positively charged protons. This configuration makes O2- a stable species that plays an important role in various chemical reactions, particularly those involving oxidation and reduction.

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Answer:

20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

Explanation:

A mole contains 6.022 x 10^23 atoms, which is also known as Avogadro's number, and this number is same for each element. So, there are 20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

The number of atoms are there in 20 moles of calcium is 120.4 × 10²³.

Avogadro's number is the number which is equal to the number of atoms of any substance that are present in one mole of that substance, and it is equal to 6.022 × 10²³.

Given moles of calcium = 20 moles

So, number of atoms in given moles of calcium will be calculated as:
No. of Ca in 20 mol = 20mol × 6.022 × 10²³ atoms/mol = 120.4 × 10²³ atoms

Hence required atoms of calcium is 120.4 × 10²³.

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The frequency of molecular collisions is directly proportional to the number of molecules and the temperature, and inversely proportional to the volume of the vessel and the mass of the molecules.

This means that increasing the number of molecules or the temperature will increase the frequency of collisions, while increasing the volume of the vessel or the mass of the molecules will decrease the frequency of collisions.

To calculate the frequency of molecular collisions per square centimeter of surface in a vessel containing nitrogen, we can use the following formula:

Frequency of collisions = (N/V) * √(8kT/πm)

Where N is the number of nitrogen molecules, V is the volume of the vessel, k is the Boltzmann constant, T is the temperature, and m is the mass of a nitrogen molecule.

Once we have the values for all of these variables, we can plug them into the formula and calculate the frequency of collisions. The result will be in units of collisions per square centimeter of surface per second.

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The percentage (by number of atoms) of the Sun that is hydrogen is approximately 91.2%.

The Sun is primarily composed of hydrogen, which is the most abundant element in its composition. Hydrogen makes up the vast majority of the Sun's mass and volume. The second most abundant element in the Sun is helium, followed by trace amounts of other elements.

The estimated elemental composition of the Sun is as follows:

Hydrogen: Approximately 91.2%

Helium: Approximately 8.7%

Trace amounts of other elements (such as oxygen, carbon, nitrogen, and others): Less than 0.1%

It is important to note that these values are approximate and can vary slightly depending on different estimates and measurements. However, the dominance of hydrogen in the Sun's composition is well-established and widely accepted.

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All cell structures work together to maintain homeostasis.

Single-celled organisms, also known as unicellular organisms, maintain homeostasis through a variety of mechanisms. Homeostasis is the maintenance of a stable internal environment, despite changes in the external environment.

Overall, single-celled organisms have evolved a range of mechanisms to maintain homeostasis in their unicellular state, allowing them to survive and thrive in diverse environments.

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