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Safety & Measurement 3 Flashcards

Safety & Measurement 3 Flashcards. These flashcards cover the Measurement Activity, the Black Objects lab, some safety rules and textbook questions. What is the physical meaning of the point (0,0) on a mass vs. volume graph?. If an object has no mass it would have no volume.

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Safety & Measurement 3 Flashcards

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  1. Safety & Measurement 3 Flashcards

  2. These flashcards cover the Measurement Activity, the Black Objects lab, some safety rules and textbook questions.

  3. What is the physical meaning of the point (0,0) on a mass vs. volume graph?

  4. If an object has no mass it would have no volume.

  5. How do you measure the volume of an object directly?

  6. Solids you would usually multiply l x w x h or use another appropriate equation.Liquids would be poured into a graduated cylinder and the level read.

  7. How do you measure the volume of an object by “difference”?

  8. First read the water level. Then place the object in a graduated cylinder and then subtract the difference in water levels.

  9. What does the slope of a mass vs. volume graph represent?What unit is it measured in?

  10. -Density-g/ml

  11. What is the volume of an object that has a density of 11.4 g/ml and a mass of 3.012g ?D = m v

  12. D = m/vv = m/d = 3.012 g 11.4 g/mlv = 0.264 ml

  13. Liquids are always measured at…

  14. - the bottom of the curve (meniscus).

  15. Which of the following is a correct measurement for a meter stick?a)5 cm c)5.13 cm b) 5.1 cm d) 5.131 cme)5.1312 cm

  16. c) 5.13 cm

  17. Outline the steps necessary to measure the mass of a chemical on balance.

  18. Move all the riders to the far left.-zero it in.-measure the mass of the weigh paper alone.-then with the chemical.-subtract the mass of the paper.

  19. Which of the following is a correct measurement for a centigram balance?a)25 g b)25.2 gc)25.21 g d)25.213 ge)25.2131 g

  20. d) 25.213 g

  21. What is the mass of an object that has a density of 2.7 g/ml and a volume of 23.0 ml ?D = m v

  22. D = m/vm = D x v = 2.7 g/ml x 23.0 mlm = 62.1 g

  23. What is the single greatest water use :a) in the east? b) in the west? c) at home?

  24. A) steam – electricityB) irrigation C) watering the lawn

  25. How do you measure massa) directly? b) by difference?

  26. a) Place the known object on the pan of the balance.b) use weigh paper with the chemical, then subtract its mass.

  27. State the rule that explains how we make measurements.

  28. -determine the smallest marking.-record the measurement to that “place value”.-estimate one more number past that marking.

  29. How do you extinguish the following fires?A. A personB. An electrical fireC. Chemicals/paper

  30. Person-Fire blanket & stop-drop-roll.Unplug and use fire extinguisher or sand.Fire extinguisher or sand.

  31. Rank the measuring devices for volume from least accurate to most accurate.

  32. Least-beakers & flasks -lg. graduated cylinder -sm. graduated cylinderMost-pipet

  33. For the unit test, review over all the safety rules as outlined on pages iv-v in the Chemistry in the Community textbook.

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