Q: Q: What substance is created when a copper turns from reddish brown to greenish brown? Choices: - rust - copper alloy - iron oxide - copper oxide A:
A: copper oxide

Q: Q: What is emitted by atoms that have been excited by thermal excitation, electron collision, or collisions with photons of exactly the right frequency? Choices: - electricity - gravity - radioactivity - light A:
A: light

Q: Q: According to the table, aluminum has an atomic number of 13. therefore, every aluminum atom has 13 protons in its what? Choices: - processes - membrane - components - nucleus A:
A: nucleus

Q: Q: When is a moving car said to be in dynamic equilibrium? Choices: - at rest - at homeostasis - when accelerating - zero net force A:
A: zero net force