How many mL of a stock solution of 2.00 M KNO3 are needed to prepare 100.0 mL of 0.15M KNO3? with work plz

Answers

Answer 1

Answer: Using the law of dilution :

Mi x Vi = Mf x Vf

2.00 x Vi = 0.15 x 100.0

2.00 x Vi = 15

Vi = 15 / 2.00

Vi = 7.5 mL

hope this helps!

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The dopamine molecule has an intermediate hydrophobicity. Edit the dopamine molecule so that it is more hydrophobic.

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You should edit the dopamine molecule by tampering with its polar groups. Polar groups affect chemical's physical properties including hydrophobicity.

Select the sketches that show aqueous solutions of a strong and weak acid.

Answers

Answer:

The strong acid is that which undergoes the most amount of ionization into hydrogen ions in aqueous solution

Explanation:

Here we note that the strength of an acid is determined by the degree of ionization into hydrogen ions [H⁺] and hydoxonium ions an aqueous solution.

Therefore, the solution that has the highest proportion of hydrogen ions per each acid molecule is considered the stronger acid.

Final answer:

Strong acids ionize more completely in an aqueous solution and thus produce a higher concentration of hydronium ions. Conversely, weak acids only partially ionize, producing fewer hydronium ions.

Explanation:

An aqueous solution of a strong acid will show a higher concentration of hydronium ions (H3O+) as a result of more complete ionization. This is because, in a strong acid, nearly every molecule dissociates, yielding these ions.

Conversely, an aqueous solution of a weak acid will show a lower concentration of hydronium ions due to partial ionization. The molecules of a weak acid do not completely dissociate, resulting in fewer ions.

These behaviors are depicted in the given figures, which show the relative strengths of acids, differentiated based on their acid-ionization constants (Ka) and the concentration of hydronium ions they generate.

Learn more about Acid Strength here:

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In terms of energy and entropy, systems in nature tend to undergo changes toward(1) higher energy and higher entropy
(2) higher energy and lower entropy
(3) lower energy and higher entropy
(4) lower energy and lower entropy

Answers

In terms of energy and entropy, systems in nature tend to undergo changes toward lower energy and higher entropy. Entropy is important as it describes the flow and distribution of energy. For a process to to occur spontaneously, it is a necessary condition that the entropy of the system undergoing the process to increase. If the entropy decreases, then that process cannot occur spontaneously. It needs some work/ energy to be pumped in in order for the process to occur

In terms of energy and entropy, systems in nature tend to undergo changes toward lower energy and higher entropy.

What are the phase change processes taking place when a substance is in equilibrium between liquid and gas phases? A. Melting and boiling B. Expanding and contracting C. Evaporating and condensing D. Freezing and thawing

Answers

Answer: C. Evaporating and condensing

Explanation: Phase change process id the process in which the phase of one substance is transforming into the another.

These chemical process of transformation can takes place under dynamic equilibrium in which conversion of one phase is in equilibrium with the another one.

In this liquid phase is transforming into the gas phase which is known as Evaporation and gaseous phase is converting back into the liquid phase which is known as Condensation.

C. Evaporating and condensing. When the liquid becomes gas is called evaporation. When gas become liquid it's condensation.

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NOÀ)

Answers

The answer is 28.02.

The chemical formula for cadmium nitrate is Cd(NO₃)₂.

There are in total 2 nitrogen atoms in Cd(NO₃)₂. If the atomic weight of nitrogen is 14.01, the mass of two nitrogen atoms in one mole of cadmium nitrate is 28.02:
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What is the difference between neutralization and saturation?

Answers

Neutralization deals with the buffering or neutralizing of acids and bases. You change the pH of either an acid or a base by adding H+ ions to a base solution or adding OH- ions by adding a base(alkali) to an acid solution. Ideally you are neutralizing either one to a neutral pH condition which is "7" on the pH scale.

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