What is the percent by volume of ethanol in a solution that contains 20. mL of ethanol dissolved in 137 mL of water?

Which best describes how johannes kepler developed his laws of planetary motion

Malik formed a hypothesis that an increase in atmospheric oxygen levels by 10% would cause red-legged grasshoppers to grow larger than normal. suppose that malik performs an experiment to test his hypothesis. which of these actions would represent a scientific mistake in his experiment? a. he experiments on live grasshoppers instead of preserved ones. b. he focuses on red-legged grasshoppers instead of all kinds of grasshoppers. c. he varies the nitrogen and carbon dioxide levels in the air from one trial to the next. d. he conducts the experiment in a controlled lab setting with a lab partner. e. he measures the mass and length of his specimens at the start of each trial.

Which answer below correctly identifies the type of change and the explanation when magnesium comes into contact with hydrochloric acid