Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-butanol?n-Butanol mixes with water.

Water molecules are carried into n-butanol.

n-Butanol molecules surround water molecules.

n-Butanol molecules are attracted to the surface of the water molecules.

Answers

Answer 1

Answer: The steps of solubility of water in N-butanol is as follows:1. N-butanol molecules are attracted to the surface of the water, 2. N-butanol molecules surround water molecules, 3. Butanol mixes with water and 4. Water molecules are carried into N-butanol.

Answer 2

Answer:

Water is dissolved into n-butanol (a polar liquid). The second step at the molecular level as water dissolves into n-butanol is n-Butanol molecules surround water molecules.

What is dissolving?

Dissolving is a process of fully mixing of the solute into a solvent. When there molecules of solute and the molecules of solvent mixed and there is no difference between them.

Thus, the correct option is C, n-Butanol molecules surround water molecules.

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Calculate the pH of a 0.30 M NaF solution. The Ka value for HF is 7.2*10^-4

Answers

This problem uses the relationship between Kb and the the dissociation constants which is expressed as Kw = KaKb. Calculations are as follows:

Kb = KaKb
1.00 x 10^-14 = 7.2 x 10^-4(x)
x = 1.39 x 10^-11

We now need to calculate the [OH¯] using the Kb expression:

1.39 x 10^-11 = x^2 / (0.30 - x)

The denominator can be neglected. Thus, x is 3.73 x 10^-6.

pOH = -log 3.73 x 10^-6 = 5.43
pH = 14-5.43 = 8.57

Answer:

pH=8.32

Explanation:

The relevant equilibrium for this problem is

F⁻ + H₂O ↔ HF + OH⁻

With a constant Kb of

Kb= $([HF][OH^(-)])/([F^(-)])$

Kb= $(x*x)/(0.30-x)$

To calculate the value of Kb we use the formula Kw=Ka*Kb, where Kw is the ionization constant of water, 1 * 10⁻¹⁴.

1 * 10⁻¹⁴ = 7.2*10⁻⁴ * Kb

Kb = 1.4 * 10⁻¹¹

So now we have

1.4 * 10⁻¹¹= $(x*x)/(0.30-x)$

We make the assumption that x<<<0.30 M, so we can rewrite the equation of Kb as:

1.4 * 10⁻¹¹= $(x*x)/(0.30)$

$4.2*10^(-12)=x^(2) \nx=2.05*10^(-6)$

So [OH⁻]=2.05*10⁻⁶

pOH=5.68

pH = 14 - pOH

pH=8.32

The first major source of oxygen gas was _____.a. volcanic outgassing
b. meteorite impacts
c. cyanobacteria
d. banded iron formations

Answers

The first major source of life on Earth was c. cyanobacteria. These organisms produce food by using energy from the sun; they are photosynthetic organisms. Over millions of years these organisms used CO2 in the air for photosynthesis and released oxygen as a byproduct. Over time oxygen concentrations rose high enough to support life.

The word that best fits in the blank in the sentence, "The first major source of oxygen gas was _____" is cyanobacteria. Thus, the answer is letter C. Cyanobacteria are blue-green algae and they are believed to have caused the "great Oxidation Event".

How do you balance __H2SO4 + __B(OH)3 --> __B2(SO4)3 + __H2O

Answers

$B(OH)_3=H_3BO_3$

then

$H_2SO_4+H_3BO_3\longrightarrow~B_2(SO_4)_3+H_2O$

$\boxed{3H_2SO_4+2H_3BO_3\longrightarrow~B_2(SO_4)_3+6H_2O}$

What is free-fall acceleration near earth's surface

Answers

free fall is when the only force acting on an object is gravity

Near Earth's surface, the distance between the object that is falling and the center of Earth does not change very much. Thus, the force given by the law of universal gravitation depends only on the mass of the object that is falling.

Define the following symbols that are encountered in rate equations: [A]0, t1/2 [A]t, k.

Answers

A rate equation can be written based on the rate constant k, concentration of reactants and half life time t1/2 of reactant if given. [A⁰] is the initial concentration of reactant A and [A]t be the final concentration.

What is rate of reaction?

Rate of a reaction is the rate of decrease in concentration of reactants or rate of increase in concentration of products. Rate of the reaction written in terms of molar concentration of reactants is called the rate law.

Consider the simplest reaction A gives B. Here the only one reactant is A. The molar concentration of A is written as [A]. The rate constant k is then,

k = [B] / [A]

If any coefficients attached with them it is written as power of the concentration term. Now, the rate of the above reaction is written as follows:

rate r = k [A]

Sometimes the initial and final concentrations of A can be considered. Where, [A⁰] is the initial concentration and [A]t be the final concentration.

The half life t1/2 is the time taken to consume half of the reactants concentration.

To find more about rate law, refer the link below:

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[A]0= Initial concentration
t1/2= half life
[A]= final concentration
k= rate constant

Ground water has some minerals dissolved in it. If you heat this water, collect the vapor in another container, and then cool it, you will get pure, or distilled, water. What makes this process a physical change?It forms a new substance (minerals), which is a physical change.

It forms a new substance (water vapor), which is a physical change.

It changes the color of water, which is a physical change.

It changes the molecular structure of water, which is a physical change.

It separates dissolved substances, which is a physical change.

Answers

Answer: the last choice, It separates dissolved substances, which is a physical change.

Explanation:

Physical changes do not modify the composition of the substances.

The substances that undergo a physical change do not brake or form chemical bonds, they just modify ther appearance: the size, the physical state (solid, liquid, or solid), the density, the shape, that kind of properties.

The salts dissolved and the water will have the same chemical propertiesin solution and after being separated, so they have not had a chemical change, they have only changed their appearance, so this explains why it is a physical change.

nah bruh its the last option. that's the only one that could even be just a physical change. E

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