1. BELLWORK In your folder turn to page 103, on the next page decorate your BELLWORK title page quietly please.

2. BELLWORK 8/18 Look at the picture to the right. Record 3 observations Make 3 inferences

3. BELLWORK 8/20 Which branch of science deals with the study of motion, forces, & energy?

4. BELLWORK 8/25 What is the difference between the independent variable and dependent variable in a controlled experiment? Give an example in an experiment.

5. BELLWORK 9/3 A scientist examined the numbers of two different species of insects on four different kinds of trees in the same forest. The results of her examination are shown on the data table. What inference can the scientist make about the insects?

6. BELLWORK 9/8 Chad is conducting an experiment to see the effect of the temperature of vinegar on the reaction with baking soda. In Chad’s experiment what is the independent variable? The dependent variable?

7. BELLWORK 9/10 How do scientists communicate their results to others? Speak at a conference Publish their results in scientific articles Exchange information on the internet

8. BELLWORK 9/10 Give an example of qualitative data and quantitative data. Write one hypothesis for an experiment.

9. Bellwork 9/15 Michelle wants to understand the effect of the amount of heat on the rate at which ice melts. Which is a factor she should consider when she designs her investigation?

10. BELLWORK 9/17 30, 5, 15, 25, 5, 10 1. What is the mean? 2. What is the mode? 3. What is the median? 4. What is the range?

11. BELLWORK 9/22 What is the most appropriate metric system unit to measure the following? a. your height: _______________________________ b. the distance between cities: ___________________________________________ c. the width of a computer screen: ___________________________________________ d. the radius of a coin? ___________________________________________

12. BELLWORK 9/29 What is matter? Give 3 examples of something that is made from matter.

13. BELLWORK 10/1 What are physical properties? Give three examples.

14. BELLWORK 10/6 What is density?

15. BELLWORK 10/8 What is the difference between mass and weight? Give 3 examples.

16. BELLWORK 10/13 How does energy affect the properties of matter?

17. BELLWORK 10/15 A cereal box has a mass of 340 g. Its dimensions are 27 cm x 19 cm x 6 cm. 1.What is the volume of the box? 2.What is its density? 3.What is the area of the front side of the box?

18. BELLWORK 10/20 What are the following descriptions? A.Substances change state. B.Atoms rearrange to form matter with different properties. C.The form of an object changes, but its type of matter stays the same. D.Solids are separated using filters.

19. A student observed a chemical reaction occurring in a beaker and collected the following data: The student concludes according to the law of conservation of mass, that mass was not conserved in the reaction. Answer each of the following: a. Explain why this is not a valid conclusion. b. Make an inference of what you think occurred. Bellwork 10/22

20. BELLWORK 11/3 A student conducted a survey of the number of children in the houses of each of his classmates. Which statement best describes the results of the survey? *Please explain your answer A.The median is 3, but the mode is less than 3. B.The median is 3, but the mode is greater than 3. C.The mode is 3, but the median is less than 3. D.The mode is 3, but the median is greater than 3. SI 32 Number of Children in the House Number of Students 15 26 310

21. Bellwork 11/10 Match the letters on the graph with the following terms: condensation, gas, solid, freezing, and liquid.

22. Explain how the diagram below shows conservation of mass Bellwork 11/12

23. Examine the graph below, and answer the following questions: 12/1 or 12/2 a. What is the boiling point of the substance? b. What is the melting point? c. Which state is present at 30ºC? d. How will the substance change if energy is added to the liquid at 20ºC?

24. Bellwork 12/3 & 12/4 Draw a Fluorine atom. Atomic number = 9 Atomic mass = 19.00 Fluorine has 10 neutrons. How many valence electrons does Fluorine have? How many protons? How many electrons?

25. Bellwork 1/5 Draw an Oxygen atom. Atomic number = 8 Atomic mass = 16.00 How many valence electrons does Oxygen have? How many protons, neutrons, & electrons?

26. Bellwork 1/12 A car drives 120 miles in 3 hours. 1. What is the speed of the car? 2. What can you add to give the car velocity? The car passes another car going from 60 mph to 70 mph in 2 seconds. 3. What is the car’s acceleration?

27. Bellwork 1/14 Describe the speed of each. Compare the graphs.

28. Describe what is happening at each point. Bellwork 1/19

29. BELLWORK 1/26 1. List 3 physical properties of the can. 2. How does the density of the aluminum in the can compare before and after the change? 3. What forces are acting on the can?

30. Bellwork 1/28 This graph shows the motion of a bicyclist. During which time period was the acceleration 0 m/s 2 ? A. 0–2 s B. 2–4 s C. 4–6 s D. 2–6 s

31. Bellwork 2/2 A student uses a force of 40 N to push a crate across the kitchen floor and friction resists with a force of 10 N. What is the net force on the crate?

32. Bellwork 2/4 You push a book sitting on a desk with a force of 5 N, but the book does not move. What is the static friction? What other forces are acting on the book?

33. Bellwork 2/16 How is it possible for a bicycle to have more momentum than a truck? The momentum of an object is the product of the mass and the velocity. momentum = mass × velocity

34. Bellwork 2/18 Hannah just finished building a house of cards that stands four- stories high. She is worried that it will fall down. Which of the following statements is definitely true? A.A house of cards is too fragile and must fall down eventually. B.If Hannah adds another card to the house of cards, then it will fall down. C.If no unbalanced force acts upon the house of cards, then it will remain standing forever. D.As long as nobody touches the house of cards, it will remain standing.