Chapter 2 Clicker Review

1. Chapter 2 Clicker Review 8th grade Mr. Murray’s class

2. Scientists use which of the following to examine models of complex systems? • simple models • graphs • computer programs • diagrams

3. Which of the following would you use to measure the mass of a toy car? • a meniscus • spring scale • a triple beam balance • a graduated cylinder

4. Why are line graphs said to be powerful tools? • They are easier to make than bar graphs. • They show how different sets of data are related. • They give more information than bar graphs. • They can show both numerical and categorical data.

5. After you have completed a lab investigation you should do all of the following except • wash your hands thoroughly. • turn off, unplug, and return any equipment to its proper place. • pour all liquid wastes down the sink drain. • clean up your work area.

6. What units would you use to measure the volume of a small plastic box? • ml • g/cm3 • grams • cubic centimeters

7. Scientists have developed models for the structure of cells because • looking at cells directly can be harmful. • cells are too small to study directly. • there are too many cells to study. • cells move too quickly to see.

8. What unit would you measure the distance from Chesterland to Cleveland? • Millimeter • Decimeter • Meter • Kilometer

9. If you spill a chemical on your skin, after notifying your teacher, you should • Call 911 • Wash your eyes thoroughly • Apply an ice pack • Rinse with large amounts of water

10. In a home central heating system, when the room temperature measured by the thermostat reaches a set value, the thermostat switches off the heater. This action by the thermostat is an example of • Output • Input • Process • Feedback

11. To measure a penny, the most appropriate measurement would be • Kilometer • Centimeter • Millimeter • Inch

12. What does it most likely mean if a graph shows no identifiable trends? • The graph has no use or value • There are more than two variables. 3. There is a strong relationship between the variables. 4. There is no relationship between the variables.

13. If scientists cannot obtain exact numbers, they should rely on a(n) • estimate • calculation • guess • assumption

14. To determine how close to the true value an experimental value is, you would use • significant figures • a precision calculation • a median • a percent error calculation

15. A line graph in which the data points fall along a straight line is called a • Non-linear graph • Linear graph • Anomolous graph • Subjective graph

16. What is the first thing you should do if an accident occurs in your classroom? • call 911. • find the emergency equipment. • start first aid treatment. • notify your teacher.

17. A group of parts that work together is called a: • system. • technology. • process. • feedback.

18. The significant figures in a measurement include 1. only the digits that have been measured exactly. 2. the digits that have been measured exactly, plus one digit whose value has been estimated. 3. only the digit whose value has been estimated. 4. only zeroes that are after the decimal point.

19. The average of a set of data is called the • Mode • Median • Range • Mean

20. To calculate the density of an object, you would • Multiply the mass by the volume • Divide the mass by the volume • Find the l x w x h and multiply by the mass • Divide the volume by the mass

21. Mass and weight are different because • Gravity affects mass • Weight is amount of matter in an object • You have more mass on the moon than weight • Gravity affects weight

22. The amount of space an object takes up is its • Density • Mass • Volume • Weight

23. The official SI unit of temperature is • Celsius • Kelvin • Fahrenheit • 0 for freezing, 100 for boiling

24. A line graph shows • changes in the independent variable • how the dependent variable changes in response to the independent variable. • what variables were controlled in an experiment • the input, process and output of a system

25. The closeness of all the measurements to each other is called • Accuracy • Estimation • Percent error • Precision

26. The closeness of the measurements to the actual answer is called • Precision • Accuracy • Sig figs • Estimation

27. If a triple beam balance shows 60 grams, 200 grams and 2.7 grams . . . • How much would the dirt weight if was in a glass beaker that weighed 42 grams?

28. What is shown on the y-axis? • Enter answer text...

29. You measure string that is 5.2 cm, 4.9 cm, 5.3 cm and 5.1 cm. • What is the mean?

30. You measure string that is 5.2 cm, 4.9 cm, 5.3 cm and 5.1 cm. • What is the mode?

31. You measure string that is 5.2 cm, 4.9 cm, 5.3 cm and 5.1 cm. • What is the median?

32. You measure string that is 5.2 cm, 4.9 cm, 5.3 cm and 5.1 cm. • What is the range?

33. If there are 37 butterflies in 1 square meter, how many butterflies can I estimate there would be in? • 5 square meters? • 120 square meters? • 1000 square meters?

34. If the experimental value is 29.3 kg and the actual value is 30 kg . . . • What is the percent error?

35. If a gift box measures 22 cm high, 37 cm wide and 15 cm long . . . • What is it’s volume?

36. A screw has a mass of 22 grams and a volume of 10 cm3 • What is its density? • Would it sink or float? • What would happen to the density if the mass was greater? • What would happen to the density if the volume was greater?

37. In a blender . . . • What is the input? • What is the process? • What is the output?