Review Sheet for Ap Chemistry
AP Chemistry Final Exam Review
ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Explain the difference between a qualitative and a quantitative measurement. Provide examples to illustrate this difference. Answer: A qualitative measurement is a measurement that gives descriptive, nonnumeric results; a quantitative measurement is a measurement that gives definite, usually numeric results. "The rock is heavy" would be a qualitative measurement. "The rock weighs 110 grams" would be a quantitative measurement.
Topic: Scientific Measurement
2) Explain the difference between precision and accuracy. Suppose you made three different mass measurements of a sugar sample you knew to have a mass of 1 g. How would you know whether or not the measurements were accurate? How would you know whether or not they were precise? Could the three measurements be precise, but not accurate? Explain. Answer: Precision is the reproducibility, under the same conditions, of a measurement; accuracy is the closeness of a measurement to the true value of what is being measured. The three measurements would be precise if they were very close to each other in value; they would be accurate if they were close to the actual 1-g value for the mass of the sample. If the measurements are very close to each other, they are precise, regardless of how close they are to the real value. Therefore, the measurements could be precise, but not accurate.
Topic: Scientific Measurement
3) Describe the rules that are used to determine the number of significant figures in the results of addition, subtraction, multiplication, and division. Answer: The answer of an addition or subtraction can have no more digits to the right of the decimal point than are contained in the measurement with the least number of digits to the right of the decimal point. The answer of a multiplication or division can have no more significant figures than the measurement having the least number of
ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Explain the difference between a qualitative and a quantitative measurement. Provide examples to illustrate this difference. Answer: A qualitative measurement is a measurement that gives descriptive, nonnumeric results; a quantitative measurement is a measurement that gives definite, usually numeric results. "The rock is heavy" would be a qualitative measurement. "The rock weighs 110 grams" would be a quantitative measurement.
Topic: Scientific Measurement
2) Explain the difference between precision and accuracy. Suppose you made three different mass measurements of a sugar sample you knew to have a mass of 1 g. How would you know whether or not the measurements were accurate? How would you know whether or not they were precise? Could the three measurements be precise, but not accurate? Explain. Answer: Precision is the reproducibility, under the same conditions, of a measurement; accuracy is the closeness of a measurement to the true value of what is being measured. The three measurements would be precise if they were very close to each other in value; they would be accurate if they were close to the actual 1-g value for the mass of the sample. If the measurements are very close to each other, they are precise, regardless of how close they are to the real value. Therefore, the measurements could be precise, but not accurate.
Topic: Scientific Measurement
3) Describe the rules that are used to determine the number of significant figures in the results of addition, subtraction, multiplication, and division. Answer: The answer of an addition or subtraction can have no more digits to the right of the decimal point than are contained in the measurement with the least number of digits to the right of the decimal point. The answer of a multiplication or division can have no more significant figures than the measurement having the least number of