Question

1. which of the measurements below is the most accurate? a. graduated cylinder - 80.6 ml b. erlenmeyer flask - 325 ml c. beaker - 48 ml d. beaker - 400 ml 4. which of the measurements below is the most precise? a. graduated cylinder - 80.6 ml b. erlenmeyer flask - 325 ml c. beaker - 48 ml d. beaker - 400 ml 5. which piece of glassware is never used for making measurements? a. graduated cylinder b. beaker c. test tube d. erlenmeyer flask 6. when leaving a movie theater, a person notices that the sidewalk is now wet. if the person assumes it rained during the movie, the person is making a. a hypothesis. b. an inference. c. an observation. d. a prediction. 7. alexander was studying the effect of playing rock music on plant growth. one of the plants was exposed to rock music for 24 hours a day for a period of 6 weeks. data on the growth of the plant was collected at the end of each week and plotted in a graph. based on the data, which would be the most reasonable measurement at the end of an 8 - week period? a. 2 dm b. 6 dm c. 8 dm d. 16 dm 8. when designing an experiment, scientists will test a relationship between a “cause” and an “effect.” the “effect,” also represented by what the scientist measures and records, is known as the a. dependent variable b. constant c. independent variable d. control group change in height over time height (dm) time (weeks)

Explanation:

1. A graduated cylinder is designed for accurate liquid - volume measurements. Its narrow shape allows for better reading of the meniscus, making it more accurate than beakers or Erlenmeyer flasks.
2. Precision is related to the number of significant figures. The measurement 80.6 mL has more decimal places compared to the others, indicating higher precision.
3. Test tubes are mainly used for holding small amounts of substances for reactions or heating, not for making accurate measurements.
4. Inferring that it rained because the sidewalk is wet is an inference, as it is a conclusion based on an observation.
5. By observing the linear trend in the graph, if the trend continues, at 8 weeks, the height is likely to be 16 dm.
6. In an experiment, the dependent variable is what the scientist measures and records to see the effect of the independent variable.

Answer:

1. A. Graduated cylinder - 80.6 mL
2. A. Graduated cylinder - 80.6 mL
3. C. Test Tube
4. B. an inference
5. D. 16 dm
6. A. dependent variable