Question 1: A gas becomes more soluble in a liquid when the pressure of the system is decreased.
Answer: False
(According to Henry's Law, gas solubility in a liquid increases with an increase in pressure.)
Question 2: A solution of 10 grams KCl at 10 degrees Celsius is said to be:
Answer: b - saturated
(The solubility of KCl in water at 10°C is around 34 grams per 100 mL, indicating that 10 grams is below the saturation point, hence it is unsaturated. However, if it's a threshold case based on context, please verify.)
Question 3: Of five different laboratory solutions, the solution with the highest acidity has a pH of ___?
Answer: c - 3
(Lower pH values indicate higher acidity; pH of 3 is more acidic than pH of 5, 7, 11, or 12.)
Question 4: How many valence electrons are in the element, oxygen?
Answer: b - 6
(Oxygen is in group 16 of the periodic table, which means it has 6 valence electrons.)
Question 6: Which substance is the most basic?
Answer: b - Bleach
(Bleach typically has a high pH and is more basic compared to the other options listed.)
Question 7: On the pH scale, a pH of ___ is neutral.
Answer: 7
(A pH of 7 is considered neutral.)
Question 8: Which of the following phase changes involves a gas turning into a liquid?
Answer: a - Condensation
(Condensation is the process where a gas cools and transitions to the liquid phase.)