In a titration, 20.0 milliliters of 0.15 M HCI(aq) is exactly neutralized by 18.0 milliliters of KOH(aq).Complete the equation in your answer booklet for the neutralization reaction by writing the formula of each product.

KOH(aq) + HCl(aq)==> +

Compare the number of moles of H+(aq) ions to the number of moles of OH-(aq) ions in the titration mixture when the HCl(aq) is exactly neutralized by the KOH(aq).

Determine the concentration of the KOH(aq).

Answers

Answer 1

Answer: The reaction yields H2O and KCl (remember that neutralization reactions produce water and a salt).When HCl is exactly neutralized by KOH, you are left with no excess H+ or OH- from the strong acid or strong base. Also, since both the acid and base are strong, their conjugate base and conjugate acid, respectively, have negligible basicity. Therefore, the final solution is of neutral pH and there are equal amounts of H+(aq) and OH-(aq).Since the acid is monoprotic and the base releases only 1 OH- per molecule dissociated, you need not worry about dissociation constants. In this case, you find the molarity using M1V1 = M2V2. You are finding M2, so M2 = M1V1/V2 = (0.15)(20.0)/(18.0) = 0.17M (this is considering significant figures).

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The correct answer is a

The questions refer to the following graphs of mechanical waves. A
B
C

The wave with the longest wavelength is (A,B,C). The wave with the smallest amplitude is (A,B,C). The wave with the most energy is (A,B,C).

Answers

A is the wave with the longest wavelength. The graph clearly shows this since wave A has a larger wavelength than waves B and C. Wave A has the longest wavelength when compared to the other two waves.

What is the C wave ?

C is the wave with the least amplitude. The graph shows this since wave C has a significantly lesser amplitude than waves A and B. Wave C has the least amplitude when compared to the other two waves. B is the most energetic wave.

The graph shows this because wave B has a larger amplitude than waves A and C. Wave B has the greatest amplitude when compared to the other two has the more energy in comparison to the two.

The longest wavelength wave has the lowest frequency and the lowest energy. A wave's wavelength is inversely related to its frequency, which implies that as the wavelength grows, so does the frequency. Because energy is proportional to frequency, the wave with the longest wavelength has the least energy.

The wave with the smallest amplitude has the least amount of energy. The largest displacement of a wave from its equilibrium position is referred to as its amplitude. The energy of a wave is exactly proportional to its amplitude, therefore as the amplitude falls, so does the energy.

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Do you have pictures of the graphs??

Which pair of compounds are isomers?(1) NO2 and N2O4
(2) P2O5 and P4O10
(3) HCOOH and CH3COOH
(4) CH3OCH3 and C2H5OH

Answers

Answer: $CH_3OCH_3$ and $C_2H_5OH$

Explanation: The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.

$CH_3OCH_3$ and $C_2H_5OH$ are functional isomers which have same molecular formula but different functional groups attached.

(1) $NO_2$ and $N_2O_4$ are different compounds.

(2) $P_2O_5$ and $P_4O_(10)$ are different compounds.

(3) $HCOOH$ and $CH_3COOH$ are different compounds.

CH3OCH3 and C2H5OH are isomers. They have same molecular formula. But with another formation.

Alloys are use to make ballpoint pens, give two reasons why

Answers

Alloys are used because of their strength, resistance to corrosion, appealing appearance and ability to be easily formed.

What is corrosion resistance?

Corrosion resistance: Alloys are resistant to corrosion and rust, which makes them an ideal material for the outer casing of ballpoint pens.

The pen's exterior can be exposed to air and moisture, but the alloy will not corrode or rust, ensuring that the pen remains in good condition for a longer period.

Durability: Alloys are typically stronger and more durable than pure metals, which makes them ideal for use in ballpoint pens.

Ballpoint pens undergo a lot of wear and tear during regular use, such as being dropped, knocked around, or exposed to high temperatures. Using an alloy ensures that the pen will not bend, break, or become deformed easily, which prolongs the life of the pen.

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Alloys are used because of its strength, resistance to corrosion, appealing appearance and ability to be easily formed

Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added to the buffer solution?

Answers

Buffer solution is a blend that has the ability to prevent the pH of the solution from undergoing large variations. It is formed by a weak acid or base, and a salt of that acid or base.
Thus, the following species exist in this buffer solution:

H2CO3: present in great quantity, therefore, being a weak acid, it suffers little ionization;
H +: from the ionization of H2CO3;
HCO3-: also present in high quantity, from ionization of H2CO3 and dissociation of salt (NaHCO3);
Na +: from ionization of NaHCO 3;
If this solution is added a small concentration of acid, its ionization will occur, generating H + cations, which will react with the HCO3- anions present in the medium, giving rise to non-ionized carbonic acid. There is no change in pH.
If a base is added, OH- anions will be generated. These ions combine with the H + cations from the ionization of H2CO3. Thus, the OH- anions are neutralized, maintaining the pH of the medium.

To better understand the annex follows:

Which Kelvin temperature is equal to 200.°C?

Answers

C = Celsius
K = k=Kelvin

C + 273.15 = K
200 + 273.15 = K
473.15 = K

Celsius + 273.15 = temperature in Kelvins

200 + 273.15 = 473.15 Kelvins

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