Evaluating Scientific Explanations — Unit test Answers

What is 0.000345 expressed in scientific notation?

Lila is using a Bunsen burner. She has all of her chemicals on her workstation. Which would be the best lab practice?

Which tool can be used to measure the volume of liquid?

Which instrument is best suited for measuring the dimensions of a shoebox?

A scientist investigated the effects of morning temperatures on flower width. Which most likely could have been a source of error in his investigation?

The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.Kepler’s StatementsThe orbit of a planet around the sun is an ellipse.As a planet orbits the sun, a line between the planet and the sun sweeps out equal areas during equal periods of time.There is a mathematical relationship between the time it takes a planet to orbit the sun and the average distance the planet is from the sun.Over the last four hundred years, predictions based on his statements have proven true. Which best describes Kepler’s statements?

Which describes the correct procedure when converting a number from scientific notation to standard notation?

Two scientists are cutting samples of leaves for analysis. One scientist always clips a sample from the base of the leaf near the stem, and the other scientist always clips a sample from the tip of the leaf. This illustrates a

The table shows results of an experiment that was replicated.

The list shows the results of six athletes competing in the long jump, which has a target distance of 20 feet.12 feet, 11 feet, 13 feet, 10 feet, 20 feet, 12 feet

Students are studying the changing concentration of carbon dioxide levels in different substances. They insert sensors into each substance and allow a device to graph the results.What are the students most likely using?

View the spinner.

Luther accidentally spilled his chemicals, and they splashed onto his arm and legs. Which piece of equipment should he use?

What does a triple-beam balance require the user to do?

Read the passage about the fluoridation of drinking water.Since the early 1960s, fluoride has been added to many sources of drinking water to prevent cavities in teeth. This is called fluoridation. There are some who say that this is unnecessary and increases the risk of cancer.In 1993, the Subcommittee on Health Effects of Ingested Fluoride of the National Research Council, part of the National Academy of Sciences, conducted an extensive study about the link between fluoridated drinking water and increased cancer risk. The study included data from more than 50 human disease studies and six animal studies. The Subcommittee concluded that none of the data showed a link between fluoridated drinking water and cancer. A 1999 report by the CDC supported these findings. The CDC report concluded that studies so far have produced "no credible evidence” of a link between fluoridated drinking water and an increased risk for cancer.