Puzzle: A man stands on a road in Iowa looking up at the night sky. On one night he sees the constellation Orion. But on another night, at the same time and on the same road, he sees the constellation Scorpius.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

How are the terms group and period used on the periodic table

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .