1. Chapter 3 Test Review

2. Measure of the force of gravity acting on an object. weight

3. A way to determine how accurate an experimental value is. percent error

4. Numerical average of a set of data. mean

5. The middle number in a set of data. median

6. Number that appears most often in a list of numbers. mode

7. The difference between the greatest value and the least value in a set of numbers. range

8. Curved upper surface of a liquid in a column of liquid. meniscus

9. System of units used by scientists to measure the properties of matter(another name for the metric system). SI (International System of Units)

10. How close a measurement is to the true or accepted value. accuracy

11. Amount of space an object or substance takes up. volume

12. Data that do not fit with the rest of the data set. anomalous data

13. Measurement system based on the number 10. metric system

14. Include all digits measured exactly, plus one estimated value. significant figures

15. Approximation of a number based on reasonable assumptions. estimate

16. Measure of how much mass is contained in a given volume. density

17. Measure of the amount of matter in an object. mass

18. How close a group of measurements are to each other. precision

19. What happens in a system (input/output). process

20. Any area outside a science laboratory. field

21. The material or energy that comes out of a system. output

22. The material or energy that goes into a system. input

23. Kind of graph in which the data point do not fall along a straight line. nonlinear graph

24. Representation of an object or process. model

25. A picture of your data. graph

26. Alert you to possible sources of accidents in a laboratory. safety symbols

27. Output that changes the system in some way.. feedback

28. Line graph in which the data points form a straight line. linear graph

29. Group or parts that work together to perform a function or produce a result. system

30. Why would scientists studying polar bears be interested in measuring their bodies and skulls as well as measuring the sea ice? p.66 Sea ice smaller = polar bears smaller

31. What is the advantage of using SI as the standard system of measurement? P. 71 Allows scientists to compare data Allows scientists to communicate with each other about results

32. How would you measure the volume of an irregularly shaped solid, like a rock? P. 75 Rock in graduated cylinder with water

33. Who is Archimedes? What is his “claim to fame”? p. 75 Greek mathematician Bathtub water rose

34. Density = (mass/volume) [d=m/v] be able to calculate the density of an object. p. 76 If the mass of an object is 4g and its volume is 2cm 3 what is the density of the object? 4g/2cm 3 4/2 = 2 So the density = 2g/cm 3

35. The SI unit used to measure time is the second. (s) p. 79

36. Be able to calculate percent error. p. 84 percent error = experimental value – true value true value