chemistry for health sciences

Correct Answer: B

Rationale: To determine the significant figures in the difference between 6172 mL and 57 mL, subtract the numbers: 6172 mL - 57 mL = 6115 mL. The answer should have the same number of decimal places as the number with the fewest decimal places in the subtraction, which is 57 mL. Hence, the correct answer is 2 significant figures. Choice A is incorrect because it is too low as it does not account for the 1 in the tens place of 57 mL. Choice C is incorrect as it is too high because the answer does not have that many significant figures. Choice D is incorrect as it also overestimates the number of significant figures in the difference.

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: B

Rationale: To determine the physical state of indium at 323�F, we convert the temperature to Celsius (323�F = 161.7�C). Since the melting point of indium is 2�C, which is lower than 161.7�C, indium would be in a liquid state at 323�F. The correct choice is B: Liquid. A: Solid - Incorrect because indium is in a liquid state at 323�F. C: Gas - Incorrect, as indium would be in a liquid state at 323�F. D: Not enough information - Incorrect since the temperature provided allows us to determine the physical state of indium.

Correct Answer: D

Rationale: To convert cm3 to liters, divide by 1000 as 1 liter = 1000 cm3. Therefore, 781.2 cm3 � 1000 = 0.7812 L. Correct answer is D: 0.7812 L. Other choices are incorrect as they do not reflect the correct conversion from cm3 to liters.

Correct Answer: A

Rationale: The correct order is A: nano- < milli- < centi- < kilo-. The rationale is as follows: 1. Start from the smallest prefix, which is nano- representing 10^-9. 2. Moving up, milli- comes next representing 10^-3, which is larger than nano-. 3. Following milli- is centi- representing 10^-2, larger than milli-. 4. Lastly, kilo- is the largest prefix representing 10^3, making it the largest of the four options. Therefore, the correct order is nano- < milli- < centi- < kilo-. The other choices are incorrect because they do not follow the correct increasing order of magnitude for the metric prefixes.