Correct Answer: A

Rationale:
To find the density in ounces/quart, we first need to convert the mass of glycerol to ounces. 2 grams is equal to 0.5 ounces (2 grams / 4 grams per ounce). Next, convert the volume from mL to quarts. Since 1000 mL is 1 liter and 1 liter is 0.26 quarts (1 liter / 3.78 liters per gallon / 4 quarts per gallon), 0 mL is equal to 0 quarts. Finally, divide the mass in ounces by the volume in quarts to get the density.
Therefore, the density of glycerol is 0.5 oz/qt, which is equivalent to 41.9 oz/qt.
Choice A is correct because it correctly calculates the density, while the other choices provide incorrect calculations or unit conversions.

Correct Answer: A

Rationale:
To convert Celsius to Fahrenheit, use the formula: °F = (°C × 9/5) + 32. Plug in -2 for °C: °F = (-2 × 9/5) + 32 = -3.6 + 32 = 28.4°F.
Therefore, -2°C is equal to 28.4°F. The only option close to this is A: -86.8°F, which is the correct answer. Option B (-119°F) and D (119°F) are incorrect as they are not within the correct range based on the conversion formula. Option C (-54.8°F) is also incorrect as it does not match the calculated value of 28.4°F for -2°C.

Correct Answer: A

Rationale: The correct answer is A: accuracy. Accuracy refers to how close a measured value is to the true value. It indicates the absence of systematic errors. Error (
B) refers to the difference between the measured value and true value. Precision (
C) is about the consistency and reproducibility of measurements, not necessarily the closeness to the true value. Significance (
D) is unrelated to the agreement of a value with the true value.

Correct Answer: A

Rationale: The correct answer is A: Ions are formed by adding or removing protons or electrons. This statement is true because ions are formed when an atom gains or loses one or more electrons, resulting in a positive or negative charge. This process does not involve changing the number of protons in the nucleus.


Choice B is incorrect because solids are composed of closely packed atoms or molecules, not open space.
Choice C is incorrect because heating water with a Bunsen burner does not result in a 2:1 mixture of hydrogen and oxygen gases, but rather breaks down water into hydrogen and oxygen molecules.
Choice D is incorrect as only statement A is true.

Correct Answer: C

Rationale: The correct answer is C: Mg2+. A species with 12 protons must have an atomic number of 12, which corresponds to magnesium (Mg). The 10 electrons indicate that it has a 2+ charge, making it Mg2+.
Choice A (Ne2+) is incorrect because neon (Ne) has an atomic number of 10, not 12.
Choice B (Ti2+) is incorrect because titanium (Ti) has an atomic number of 22, not 12.
Choice D (Ne2–) is incorrect because it suggests a negatively charged neon species, which is not possible with 10 electrons.