Question: Q: What do you call reversible changes that do not change matter's chemical makeup or chemical properties? Choices: - potential changes - element changes - chemical changes - physical changes A:
Answer: physical changes

Question: Q: What kind of rays can travel thousands of meters through air and can penetrate and damage cells deep inside the body? Choices: - x-rays - cosmic rays - plasma rays - gamma rays A:
Answer: gamma rays

Question: Q: Ion drives have low thrust but high what? Choices: - power - acceleration - tolerance - efficiency A:
Answer:
efficiency