Hypotheses, Theories, and Laws Answers

Which provides a baseline for an experimental investigation?

Sheila conducts an investigation to see how the amount of salt dissolved in water affects the density of the water. Which statement best describes the correct plan for her procedure?

Lidia plans an experimental investigation to see how the thickness of a lens affects the point where a beam of light is focused. She plans to shine light through a lens and measure the distance to a screen that is placed where the beam focuses.What are the controls in Lidia’s investigation?

Maggie is a member of her school’s environmental club and is interested in recycling. She asks the question, “How does exposure to the environment affect recyclable plastics?”What best describes why and how Maggie should change her question to make it a better scientific question?

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Rhonda watched a video taken by a camera that was lifted into the upper atmosphere by a weather balloon. She saw the balloon pop when it reached a certain height. Afterward, Rhonda wondered what effect the air pressure at high altitudes has on the volume of gas in balloons.What scientific practice is Rhonda performing?

Which kind of investigations never include a hypothesis?

Which statement best describes comparative and descriptive investigations?

Omar observes that many buildings in his city were built using limestone. He has read that acid rain can damage limestone. He also knows that limestone reacts with acids and that chemical reactions are affected by temperature. With this in mind, he conducts an investigation to see how the amount of damage to the limestone is affected by the amount of acid on the stone.Which statement describes the correct plan for his procedure?

Chou is curious about the effect of magnets on how plants grow. He sets up ten pots with alfalfa sprouts. He places strong magnets under five of the pots but does not put magnets under the other five pots.This is an example of which scientific practice?