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    1. What is H2O?

    2. What is the formula for calculating density?

    3. Where can names and symbols of elements be found?

    4. How quickly diffusion happens depends on?

    5. What is it called for every 2 atom?

    6. What is a molecule?

    7. Can the particles in gas be compressed?

    8. What are some example of elements?

    9. What does density tell us?

    10. What does density depend on?