1. The atmosphere of earth is an example of what kind of solution?
A. liquid-liquid
B. gas-liquid
C. gas-gas***
D. solid liquid
2. Which of the following will result in a greater amount of oxygen dissolving in water?
A. Heat the water***
B. Decrease the oxygen gas pressure
C. Increase the oxygen gas pressure
D. All of the above
3. ____ are substances that release positively charged hydrogen atoms, while ______ are substances accept positively charged hydrogen atoms.
A. acids; aqueous solution
B. bases; saturated solutions
C. acids; bases***
D. weak acids; alloys
9. Given equal concentrations, which of the following produces the FEWEST amount of hydronium ions in an aqueous solution?
A. strong acid
B. weak acid
C. strong base
D. weak base
2 is wrong. 1 and 3 are right. 9 is confusing; the answer depends upon how the question is interpreted. If it means the fewest H3O^+ IN SOLUTION the answer is C. If it actually means the fewest H3O^+ PRODUCED then both C and D are right. Neither C nor D PRODUCES a H3O^+.
1. To determine the type of solution that the atmosphere of Earth is an example of, we need to understand the composition of the atmosphere. The Earth's atmosphere is predominantly composed of gases such as nitrogen, oxygen, carbon dioxide, and others. Therefore, the correct answer is B. gas-liquid.
To arrive at this answer, you can consider the fact that the atmosphere is a mixture of gases (the gas component) that is in contact with the Earth's surface (the liquid component, which is the water bodies on Earth's surface).
2. To determine which of the given options will result in a greater amount of oxygen dissolving in water, we need to understand the principles behind gas solubility. According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.
Based on this, the correct answer is C. Increase the oxygen gas pressure. By increasing the pressure of oxygen gas above the water, more oxygen molecules will collide with the water surface, leading to a higher number of oxygen molecules dissolving in the water.
3. The question is asking about substances that release and accept positively charged hydrogen atoms. These substances are referred to as acids and bases in the context of chemistry.
The correct answer is C. acids; bases. Acids are substances that release positively charged hydrogen ions (H+ ions), and bases are substances that accept these hydrogen ions.
It is important to note that acids are usually present in aqueous solutions, which is why the term "aqueous solution" is associated with acids in option A. On the other hand, option B mentions saturated solutions, which is an unrelated concept and does not accurately describe bases.
9. To determine which of the given options produces the fewest amount of hydronium ions in an aqueous solution, we need to understand the strength of acids and bases. A strong acid or base is one that completely dissociates in water, releasing a high concentration of hydrogen or hydroxide ions respectively.
Based on this, the correct answer is B. weak acid. A weak acid does not dissociate completely in water and therefore produces fewer hydronium ions compared to a strong acid (option A) or a strong base (option C). A weak base (option D) does not produce hydronium ions as it accepts rather than donates them.