Here are the correct answers for the questions you have provided:
Question 1:
A) When salt dissolves completely into water, which term is used to describe the water?
Answer: solvent
Question 2:
A) Which statement best describes what happens when oil and water are stirred together?
Answer: Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
Question 3:
A) Salt is dissolved into a water solvent. Can the salt be extracted, and will it retain its properties?
Answer: Yes, it can be extracted through evaporation. It retains its original properties.
Question 4:
A) Crystals are made using supersaturated solutions of solids in water. These solutions hold more of the solute than they would at room temperature. How are these solutions made?
Answer: The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
Question 5:
A) Which substance is most likely to dissolve in greater quantities in cold water?
Answer: oxygen
Question 6:
A) How is a mole related to concentration?
Answer: The number of particles of solute in a solution is measured in moles.
Question 7:
A) How are ionic compounds similar to polar compounds?
Answer: Both compound types have oppositely charged regions.
Question 8:
A) Which feature do polar compounds have that nonpolar compounds lack?
Answer: oppositely charged ends
Question 9:
A) Which statement best describes what it means when something is classified as a strong acid?
Answer: It easily dissociates into ions in solution.
Question 10:
A) The pH of a substance is measured. Which value would identify the substance as a strong base?
Answer: 11.0
Question 11:
A) Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest?
Answer: HCl, H2S, PH3
Question 12:
A) Which statement correctly explains why H2S is a stronger acid than water?
Answer: Sulfur (S) has a larger atomic size than oxygen (O), so HS– is a more stable, stronger acid than OH–.
Question 13:
A) What is the pH of a 1×10−4 mol HCl solution?
Answer: 4
Question 14:
A) 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?
Answer: The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong base.
Question 15:
A) Ammonia is a weak base. Potassium hydroxide is a strong base. Which statement is correct?
Answer: A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia.
Question 16:
A) A scientist has 500 mL of a 2.1 M stock solution. She dilutes the solution, and the volume of the solution after the dilution is 3.25 L. What is the molarity (M) of the diluted solution?
Answer: 0.32 M
Question 17:
A) Which statement is the best explanation for the graph?
Answer: As temperature rises, gas particles are moving faster and may leave the solution.
Question 18:
A) Identify the acid, base, conjugate acid, and conjugate base in the reaction.
- H2Se is a(n) acid
- H2O is a(n) base
- SeH– is a(n) conjugate base
- H3O+ is a(n) conjugate acid
Question 19:
A) Which phrase best defines a covalent bond?
Answer: electrons shared between atoms
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