Answer the following question given this paragraph: Magnetism produced by electricity is called electromagnetism . Today, electromagnetism is used in many electric devices. However, until electromagnetism was discovered, scientists thought that electricity and magnetism were unrelated. A Danish scientist named Hans Christian Oersted (pictured in the Figure below ) changed all that. He made the important discovery that electric current creates a magnetic field. But like many other important discoveries in science, Oersted's discovery was just a lucky accident. Q: What magnetism is produced by electricity? Choices: - excitation - diffusion - Charges - electromagnetism A:
electromagnetism
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Answer the following question given this paragraph: Motion of water molecules helps break up interactions between solid ions or molecules. Q: Motion of water molecules helps break up interactions between what? Choices: - ions or hormones - acids and bases - enzymes and acids - solid ions or molecules A:
solid ions or molecules
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Answer the following question given this paragraph: Perhaps the most familiar example of corrosion is the formation of rust on iron. Iron will rust when it is exposed to oxygen and water. The main steps in the rusting of iron appear to involve the following (Figure 17.17). Once exposed to the atmosphere, iron rapidly oxidizes. anode: Fe(s) Fe 2+(aq) + 2e . Q: Iron will do what when it is exposed to oxygen and water? Choices: - become hot - expand - contract - rust A:
rust
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Answer the following question given this paragraph: Transition metal ions often involve rearrangements of both d and s electrons. Q: What is the unit of liquid measurement in the metric system? Choices: - pint - gallon - cylinder - liter A:
liter
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