Question: Q: Where is the potential energy of a river the highest at? Choices: - the middle - the ocean - the bank - the source A:
Answer: the source

Question: Q: Compared with the molecules of many other substances, molecules of water are strongly attracted to what? Choices: - hydrogen - helium - nothing - each other A:
Answer: each other

Question: Q: Which metalloids are found in the nitrogen group? Choices: - polonium and antimony - selenium and antimony - sulfur and polonium - arsenic and antimony A:
Answer:
arsenic and antimony