Chemistry Chapter One: Pt. 3

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Chemistry Chapter One: Pt. 3
2012-09-06 08:59:38
Matter Measurement

Chapter One
Show Answers:

  1. What are derived units?
    • Units that combine several fundamental units to derive their unity
    • example: area= length x length
  2. In the lab, what do we measure the volume of a solid, liquid, and gas, as?
    • solid: cm3
    • liquid: mL
    • gas: L
  3. Why is the volume of a gas measured with its measurement and not that of the liquid?
    • It deals with the density of water
    • 1┬ámL= 1 cm3
    • Water is more dense at 3.98oC as a liquid. As you get away from the liquid state, the density decreases, making water lighter
    • Because gas is not very dense, it is measured in g/L
  4. Each cubic meter contains __ cubic decimeters, which contain __ cubic centimeters.
    • 1000
    • 1000
  5. What is accuracy?
    how close to a true value a given measurement is
  6. What is precision?
    • how well a number of independent measurements agree with each other
    • - How well can you repeat/ receive the same value?
  7. What is standard deviation
    • amount of precision
    • the higher it is, the less precise your answer
  8. What should we pay attention to when doing measurements?
    significant figures
  9. Does it matter what we measure with?
  10. Area
    length x length
  11. volume
    area x length
  12. density
    mass per unit volume
  13. speed
    distance per unit time
  14. acceleration
    change in speed per unit time
  15. force
    mass x acceleration
  16. pressure
    force per unit area
  17. energy
    force x distance