ATI RN
chemistry for health sciences Questions
Question 1 of 5
Express the volume 781.2CM3 in liters.
Correct Answer: D
Rationale: In pharmacology and health sciences, understanding and working with different units of measurement, such as volume, is crucial for accurate dosing and calculations. In this question, the volume of 781.2 cm³ needs to be expressed in liters. The correct answer is D) 0.7812 L. To convert cubic centimeters (cm³) to liters (L), we need to remember that 1 liter is equal to 1000 cubic centimeters. Therefore, to convert 781.2 cm³ to liters, we divide 781.2 by 1000, which gives us 0.7812 liters. Now let's analyze why the other options are incorrect: A) 781.2 L - This is the same value as the initial volume but in liters, which is incorrect as the conversion requires dividing by 1000. B) 78.12 L - This option is also incorrect as it is a result of misplacing the decimal point in the conversion. C) 7.812 L - Similar to option B, this answer is a miscalculation of the conversion factor. Understanding these conversions is essential for healthcare professionals to ensure accurate medication dosages and formulations. Practicing these conversions helps reinforce mathematical skills necessary for safe and effective pharmacological practice.
Question 2 of 5
Convert 4 mi to km. (1 m = 094 yd, 1 mi = 1760 yd)
Correct Answer: B
Rationale: To convert 4 mi to km, first convert miles to yards: 4 mi * 1760 yd/mi = 7040 yd. Then convert yards to meters: 7040 yd * 0.9144 m/yd = 6437.216 m. Finally, convert meters to kilometers: 6437.216 m/1000 m/km = 6.437216 km. Rounding to three significant figures, the answer is 3.69 x 10^1 km (B). Other choices are incorrect because they do not correctly convert miles to kilometers or have calculation errors.
Question 3 of 5
Convert 0494 to L. (54 cm = 1 in., 1 L = 1 )
Correct Answer: A
Rationale: To convert 0494 to L, we first convert it to inches: 494 cm ÷ 54 cm/in = 9.148 in. Then, we convert inches to L: 9.148 in × 1 L/54 in = 0.169 L. The correct answer is A: 1.40 101 L, which is the correct conversion of 0.169 L to scientific notation. Choices B, C, and D are incorrect due to incorrect conversions or not being in scientific notation.
Question 4 of 5
A 0 mL sample of glycerol has a mass of 2 grams. What is the density of glycerol in ounces/quart? (00 ounce = 4 grams, and 00 liter = 06 quarts)
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.
Question 5 of 5
What was the price of London petrol in dollars ($) per gallon? (1 gal = 7854 L)
Correct Answer: B
Rationale: The correct answer is B: $2.20 /gal. To convert the price of London petrol given in British pounds to dollars per gallon, we first need to convert the price from pounds to dollars using the current exchange rate. Then, we convert the price per liter to price per gallon by multiplying by the conversion factor (1 gal = 3.7854 L). The conversion results in $2.20 /gal. Choice A ($4.46 /gal) is incorrect because it is not the correct conversion of the given price. Choice C ($9.05 /gal) is incorrect as it is too high based on the correct conversion. Choice D ($1.58 /gal) is incorrect as it does not accurately reflect the conversion from pounds to dollars and liters to gallons.