The procedure warns against adding more than 15 ml of xylene to the erlenmeyer flask during recrystallization. why?

The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

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The primary factor responsible for several properties of water is its propensity to form hydrogen bonds. Hydrogen bonds occur between the positively charged hydrogen atom of one water molecule and the negatively charged oxygen atom of another water molecule.

This unique bonding ability of water molecules gives rise to properties such as high boiling point, high specific heat capacity, cohesion, and adhesion.

However, the propensity of water molecules to form hydrogen bonds is not responsible for one particular property of water: its low viscosity. Viscosity refers to a liquid's resistance to flow, and in the case of water, this property is primarily determined by the size and shape of the water molecules themselves.

In summary, the propensity of water molecules to form hydrogen bonds is responsible for several properties of water, except for its low viscosity.

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Diethylammonium iodide, (C2H5)2NH2I, is a salt of a weak base, diethylamine, and a strong acid, hydroiodic acid. When this salt dissolves in water, it dissociates into its constituent ions as follows:

(C2H5)2NH2I(s) → (C2H5)2NH2+(aq) + I^-(aq)

Since the cation (C2H5)2NH2+ is the conjugate acid of a weak base, it can undergo hydrolysis in water to produce H+ ions and the weak base, diethylamine:

(C2H5)2NH2+(aq) + H2O(l) ⇌ (C2H5)2NH(aq) + H3O+(aq)

The equilibrium constant for this reaction is the base dissociation constant, Kb, for diethylamine. The pH of the solution depends on the concentration of H3O+ ions produced by this reaction.

To calculate the pH of the solution, we need to first calculate the concentration of (C2H5)2NH2+ ions in solution:

(C2H5)2NH2I(s) → (C2H5)2NH2+(aq) + I^-(aq)

Since 1 mol of (C2H5)2NH2I produces 1 mol of (C2H5)2NH2+ in solution, the concentration of (C2H5)2NH2+ is equal to the concentration of (C2H5)2NH2I:

[C2H5)2NH2+] = 0.13 M

Next, we can calculate the concentration of OH^- ions produced by the hydrolysis of (C2H5)2NH2+:

Kb = [C2H5)2NH][OH^-]/[(C2H5)2NH2+]

Since the concentration of (C2H5)2NH in solution is negligible compared to the initial concentration of (C2H5)2NH2I, we can assume that [C2H5)2NH] ≈ 0:

Kb = [OH^-][C2H5)2NH2+]/Kb

[OH^-] = Kb[C2H5)2NH2+]/[(C2H5)2NH]

[OH^-] = (6.9 × 10^-4)(0.13)/(0.00)

[OH^-] = 8.97 × 10^-5 M

Finally, we can calculate the pH of the solution:

pH = -log[H3O+]

[H3O+] = Kw/[OH^-]

[H3O+] = (1.0 × 10^-14)/(8.97 × 10^-5)

[H3O+] = 1.11 × 10^-10 M

pH = -log(1.11 × 10^-10)

pH = 9.95

Therefore, the pH of 0.13 M diethylammonium iodide solution is 9.95 (rounded to two decimal places).

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Answer:

its b beacuse different things have different mass

Given data,

∣q∣=1.6×10−19 Cm

e=9.1×10−31 kgm

n≈m

p​=1.67×10−27

kgr≈5.28×10−11 m

Formula:

F e = 4πϵ 0 1 r2q e q n​​

F g  = G r 2m e m n

​​Given that,

∣q∣=1.6×10−19 C,

r≈5.28×10−11 m,

m e​=9.1×10−31 kg

 m n≈m p​=1.67×10−27 kg.

F e = 4πϵ 0 1 r2q e q

n​  =  9 × 10 9 N.

m2C−2 × 1 × (1.6 × 10−19 C)2 / (5.28 × 10−11 m)2

= 8.2 × 10−8 N

Similarly,

F g = G r 2m e m

n​  = 6.67 × 10−11 Nm2kg−2 × (1.67 × 10−27 kg) × (9.1 × 10−31 kg) / (5.28 × 10−11 m)2

= 8.2 × 10−8 N.

The radius of the hydrogen atom is the radius at which the attractive electric force between the proton and the electron equals the gravitational force, or,

FE = FG8.2 × 10−8 N = 8.2 × 10−8 N 5.28 × 10−11 m

= (4πε₀) (1.6 × 10−19 C)2 / r2 G (1.67 × 10−27 kg) (9.1 × 10−31 kg)

Simplifying,

r3 = (4πε₀ / G) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)

The universal gravitational constant is,

G = 6.67 × 10−11 m3 ⋅ kg−1 ⋅ s−2r3

= (4π × 8.8542 × 10−12 F/m) / (6.67 × 10−11 N m2/kg2) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)r

= 5.3 × 10−11 m, approximately.

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Answer:could it be kilo

Explanation:it looks like it has the least letters

Answer:

Knowing the units of measurement that correspond with a number can give you so much more information than a digit sitting there by itself. Units can: Help to show another person the exact amount you have.

Explanation:

Answer:

5 would be the large intestine

Explanation:

The balanced chemical equation for the acid-base reaction is:

2HCl + Ca(OH)2 → CaCl2 + 2H2O

A balanced chemical equation is a representation of a chemical reaction that shows the relative number of reactant and product molecules involved. It follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. In a balanced equation, the number of atoms of each element on both sides of the equation is equal.

A balanced chemical equation includes chemical formulas of reactants on the left side of the arrow and the chemical formulas of products on the right side. Coefficients are used to balance the equation by adjusting the number of molecules or moles of each substance involved. These coefficients indicate the relative stoichiometric ratios between reactants and products.

According to the equation, for every 1 molecule of CaCl2 that forms, 2 water molecules are produced. Therefore, the correct answer is:

twice as many, 2x

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Suspension will settle out if allowed to sit on a table

In suspension the solute does not dissolve in liquid and when placed on table for sometime and it will settle down at the bottom of the beaker and we can separate particles of solute easily from solvent through filtration and the colloid particles of solute does not dissolve in liquid neither it is settle down and it float through the solvent and in solution the particles of solute dissolve in to the solvent and we cannot identify them as separate we cannot separate them by filtration and in compound the two element combine to form a new thing and resultant compound have two new or different properties other than its ingredients so the correct answer is suspension

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Answer:

Selenium

Explanation:

selenium has 4 energy levels (think a 4 story building) while oxygen only has 2 (think 2 story building). which one is taller?

To match each compound with the value of Ksp expressed as a function of the molar solubility, we need to know the chemical equations for the dissolution of these compounds.

The molar solubility of a compound is the number of moles of the compound that dissolve in one liter of solvent.

The solubility product constant (Ksp) is an equilibrium constant that represents the extent of the dissolution of a sparingly soluble compound.

Here are the chemical equations for the dissolution of the compounds you provided:

1. FeCl3:

FeCl3(s) ⇌ Fe3+(aq) + 3Cl-(aq)

2. CaBr2:

CaBr2(s) ⇌ Ca2+(aq) + 2Br-(aq)

3. FeCl2:

FeCl2(s) ⇌ Fe2+(aq) + 2Cl-(aq)

Now, let's match each compound with the corresponding expression of Ksp in terms of molar solubility:

1. FeCl3:

The molar solubility of FeCl3 is [Fe3+] = x and [Cl-] = 3x. Since there are three chloride ions per formula unit of FeCl3, the expression for Ksp is:

Ksp = [Fe3+][Cl-]³ = x(3x)³ = 27x⁴

2. CaBr2:

The molar solubility of CaBr2 is [Ca2+] = x and [Br-] = 2x. Since there are two bromide ions per formula unit of CaBr2, the expression for Ksp is:

Ksp = [Ca2+][Br-]² = x(2x)² = 4x³

3. FeCl2:

The molar solubility of FeCl2 is [Fe2+] = x and [Cl-] = 2x. Since there are two chloride ions per formula unit of FeCl2, the expression for Ksp is:

Ksp = [Fe2+][Cl-]² = x(2x)² = 4x³

Therefore, the compounds matched with their corresponding expressions of Ksp in terms of molar solubility are:

1. FeCl3: Ksp = 27x⁴

2. CaBr2: Ksp = 4x³

3. FeCl2: Ksp = 4x³

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Mass of potassium bromide must be dissolved to prepare 100 ml of a 0.164 m aqueous solution is 1.95 gram

It is given that

volume of aqueous solution = 100 ml

molarity of solution = 0.164 m

We have to find mass of potassium bromide

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution

Molarity = (given mass/molar mass) x (1/volume of solution)

0.164 = (mass/119) x 1000/100

0.164 = mass/119 x 10

0.164 x 119/10 = mass

mass = 1.95 gram

Hence, Mass of potassium bromide must be dissolved to prepare 100 ml of a 0.164 m aqueous solution is 1.95 gram

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The wavelength of the x-rays emitted is 1.52 × 10⁻¹¹ m.

Frequency of x-rays emitted = ν = 1.97 × 10¹⁹ Hz

Energy of photon = E = hν

where h is Planck's constant = 6.626 × 10⁻³⁴ J sWe need to find the wavelength of the emitted x-rays.

We can use the relationship between the frequency (ν) and wavelength (λ) of an electromagnetic wave, which is given by:

c = λν

Here c is the speed of light in vacuum = 3.0 × 10⁸ m/s. Rearranging this equation, we get

:λ = c/ν

Putting in the values, we get:

λ = c/ν= 3.0 × 10⁸ m/s / 1.97 × 10¹⁹ Hz= 1.52 × 10⁻¹¹ m

Thus, the wavelength of the x-rays emitted is 1.52 × 10⁻¹¹ m.

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The oil that provides the most monounsaturated fatty acids is olive oil. Monounsaturated fatty acids are a type of healthy fat that can help lower cholesterol levels and reduce the risk of heart disease. Olive oil is particularly rich in these fatty acids, making it a great choice for cooking and dressing salads.

While fish oil, coconut oil, flaxseed oil, and corn oil all contain some monounsaturated fatty acids, they are not as high in this type of fat as olive oil. Fish oil is a good source of omega-3 fatty acids, while coconut oil is high in saturated fat. Flaxseed oil is a good source of both omega-3 and omega-6 fatty acids, and corn oil is a good source of polyunsaturated fatty acids.

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Answer:

They are Weaker than a chemical

corrected by the one in the comment section

Answer:

A) Chemical Change

Explanation:

Chemical changes occur when bonds are broken and formed between molecules or atoms. This means that one substance with a particular set of properties (such as melting point, color, taste, etc.) is turned into a different substance with different properties.

Answer:

204,375 mL.

Explanation:

327 mL - 3.2 M

x mL - 2 M

x= (2 M x 327 mL) /3.2 M

x= 204,375 mL.

Answer:

139.11 grams

Explanation:

The molarity (M) is equal to m (moles) /L (liters).

Notice how it is in mL so converting it would be 0.75 L (750*10-3)

Now plug in the information

1.75=m/0.75

m=1.3125

Now m is in moles so convert to grams to get the mass

1.3125 mol Na2CO3 * 105.9888 g Na2CO3 = 139.1103

Answer:

21

Explanation: 2+1=21

Answer:

FiCi2

Explanation:

In relation of Iron(ii) chloride, FeCl2

Answer: as the number of predators increases, more prey are captured. as a result the prey population starts to decrease.

The amount of neutrons varies, but they all have the same number of protons.

They are known as isotopes. Isotopy refers to the presence of two or more atoms of the same element that have the same atomic number but have distinct masses as a result of the varied numbers of neutrons present in their respective nuclei.

The quantity of protons in an atom determines its atomic number. It is equal to the number of electrons for a neutral atom.

The quantity of protons and neutrons in an atom is known as the mass number.

These are all 16-atomic-number isotopes.

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The net ionic equation for the precipitation reaction between aqueous magnesium chloride (MgCl2) and aqueous sodium phosphate (Na3PO4) can be determined by identifying the precipitate formed. Here's the balanced net ionic equation:

3Mg2+(aq) + 2PO43-(aq) → Mg3(PO4)2(s)

In this reaction, the magnesium ions (Mg2+) from magnesium chloride combine with the phosphate ions (PO43-) from sodium phosphate to form solid magnesium phosphate (Mg3(PO4)2) as the precipitate.

Note that the sodium ions (Na+) and chloride ions (Cl-) are spectator ions and do not participate in the formation of the precipitate. Therefore, they are not included in the net ionic equation.

It's important to note that the state of each compound (whether it is aqueous or solid) should be indicated in the balanced equation.

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The question requires us to choose the best option to explain why bubbles rise faster from a warm can of soda than a cold can, based on the solubility of gases in liquids.

Adding heat to a solution composed of a liquid and a gas (i.e., increasing its temperature) provides thermal energy to the gas that makes it possible to overcome the forces that maintain molecules of solvent (liquid) and solute (gas) together. In this way, the molecules of solvent and solute tend to separate, therefore decreasing the solubility of the gas. Based on this, we can say that the solubility of gases in liquids increase with increasing temperature.

Therefore, the best option to answer the question is the first one, "gases become less soluble in liquids at higher temperatures".