ATI RN
chemistry for health sciences Questions
Question 1 of 5
Which of the following is an example of a quantitative observation?
Correct Answer: A
Rationale: The correct answer is A because it involves a measurable quantity (length) that can be expressed numerically. This is a quantitative observation as it can be described with numbers.
Choices B and C describe qualities (color and appearance) which are qualitative observations.
Choice D provides a quantitative measurement (temperature) but it is not an observation, rather a measurement.
Question 2 of 5
Generally, observed behavior that can be formulated into a statement, sometimesmathematical in nature, is called a(n)
Correct Answer: A
Rationale: The correct answer is A: observation. Observations are specific instances of behavior that can be described and formulated into statements, including mathematical ones. Measurements (choice
B) involve quantifying observations. Theories (choice
C) are broader explanations based on observations. Natural laws (choice
D) are general principles derived from consistent observations. In this context, the term "observed behavior" specifically points to the act of witnessing and formulating statements about behavior, making choice A the most suitable option.
Question 3 of 5
Which of the following metric relationships is incorrect?
Correct Answer: B
Rationale: The correct answer is B: 1 gram = 10^3 kilograms. This is incorrect because 1 kilogram is equal to 1000 grams, not 100 grams. A is correct as 1 microliter is indeed 10^-6 liters. C is correct as 10^3 milliliters equals 1 liter. D is correct as 1 gram is equal to 10^2 centigrams. The incorrect relationship in choice B violates the metric system conversion factor of 1 kilogram being equal to 1000 grams.
Question 4 of 5
Order the four metric prefixes from smallest to largest.
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.
Question 5 of 5
The degree of agreement among several measurements of the same quantity is called . It reflects the reproducibility of a given type of measurement.
Correct Answer: C
Rationale: The correct answer is C: precision. Precision refers to the degree of agreement among repeated measurements of the same quantity. It reflects how close the measurements are to each other, indicating reproducibility. Accuracy (choice
A) is about how close a measurement is to the true value, not the agreement among multiple measurements. Error (choice
B) is a deviation from the true value and not specifically related to the agreement among measurements. Significance (choice
D) is about the importance or relevance of a result, not the consistency of measurements.
Therefore, precision is the most appropriate term in this context.