In the salt-water mixture, water acts as the solvent. The solute in this case is the salt.
When salt dissolves completely in water, which term best describes the role of water in the salt-water mixture?(1 point) Responses concentration concentration solvent solvent solute solute molarity
11 answers
Which statement best describes what it means when something is classified as a strong acid?(1 point) Responses It is present in large quantities in a solution. It is present in large quantities in a solution. It is present in low quantities in a solution. It is present in low quantities in a solution. It easily dissociates into ions in solution. It easily dissociates into ions in solution. It resists dissociating into ions in solution.
The statement that best describes what it means when something is classified as a strong acid is: It easily dissociates into ions in solution.
Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest? (1 point) Responses PH3, H2S, HCl PH 3 , H 2 S, HCl HCl, PH3, H2S HCl, PH 3 , H 2 S H2S, PH3, HCl H 2 S, PH 3 , HCl HCl, H2S, PH3
Based on the strength of the acids, the correct order from strongest to weakest is: HCl, H2S, PH3.
So the response would be: HCl, H2S, PH3.
Question A small amount of sodium hydroxide is added to water. When the chemical reaction reaches equilibrium, the pH is 12. Which statement and conclusion about sodium hydroxide is correct?(1 point) Responses The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong acid. The negative log of the concentration of OH – ions is 12. Sodium hydroxide is a strong acid. The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong base. The negative log of the concentration of OH – ions is 12. Sodium hydroxide is a strong base. The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong base. The negative log of the concentration of OH – ions is 2. Sodium hydroxide is a strong base. The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong acid.
The correct statement and conclusion about sodium hydroxide is: The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong base.
This is because a pH of 12 indicates that the solution is basic, which is consistent with sodium hydroxide being a strong base. The pOH can be calculated as follows:
pOH = 14 - pH = 14 - 12 = 2.
Thus, the concentration of OH– ions would be 10^-2 M, leading to the conclusion about sodium hydroxide as a strong base.
Ammonia is a weak base. Potassium hydroxide is a strong base. Which statement is correct?(1 point) Responses A solution of potassium hydroxide will always have a lesser concentration of solute than a solution of ammonia. A solution of potassium hydroxide will always have a lesser concentration of solute than a solution of ammonia. A solution of potassium hydroxide will always have a lower pH than a solution of ammonia. A solution of potassium hydroxide will always have a lower pH than a solution of ammonia. A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia. A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia. A solution of potassium hydroxide will always have lesser conductivity than a solution of ammonia.
The correct statement is: A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia.
This is because potassium hydroxide (KOH) is a strong base and fully dissociates in water to produce a high concentration of OH– ions, while ammonia (NH3) is a weak base that only partially dissociates in solution. Therefore, a solution of KOH will have a higher concentration of hydroxide ions compared to a solution of ammonia.
If only an element’s atomic number and weight are provided, what other atomic information can be determined for a neutral atom?(1 point) Responses only the valence electrons only the valence electrons the number of protons, electrons and neutrons the number of protons, electrons and neutrons only the number of protons and electrons only the number of protons and electrons only the number of protons and neutrons
If only an element’s atomic number and weight are provided, the other atomic information that can be determined for a neutral atom is: the number of protons, electrons, and neutrons.
- The atomic number gives the number of protons (and electrons in a neutral atom).
- The atomic weight (or atomic mass) can be used to estimate the number of neutrons by rounding to the nearest whole number and subtracting the number of protons.
Thus, you can determine all three quantities for a neutral atom.