Question of the Day

1. Question of the Day 1. Knowing the ultimate purpose of each activity, which of the following would MOST LIKELY be a part of a scientific investigation? • Traveling to the rain forest • Extracting DNA samples from eight varieties of rain forest beetles • Moving to the rain forest to see if you can survive there. • Listening to the music of native Indians. • SCSh1,3,6,8

2. Q.O.D. 2. Which of the following is a technological design investigation? • Buying a go-cart • Installing a new bumper • Finding ways to make the go-cart faster • Painting the go-cart SCSh1,3,6,8

3. Q.O.D. 3.Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jeremy asks his science teacher, Ms. Jackson, a question:"How does adding salt affect the boiling temperature of water?"Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer.  • The following questions are based on the experiment Jeremy does to find an answer.

4. Q.O.D. 3. Jeremy writes an hypothesis before beginning his experiment. Which of the following is the hypothesis he wrote? A. Pasta manufacturers and salt companies have signed a business deal. B. Adding salt to pasta water makes the pasta taste better. C. Adding salt to pasta water will cause the water to boil at a higher temperature. D. Certain types of salts will not dissolve in boiling water.

5. Q.O.D. 4.What would be a likely control condition for Jeremy's experiment? A. One quart of boiling water with salt added B. One quart of boiling water with no salt added C. One quart of room temperature water with salt added D. One quart of room temperature water with no salt added

6. QOD 5. Draw your own version of this graph

7. Q.O.D. 5.The graph summarizes Jeremy's results. What conclusion can be made from these results? A. Adding salt to the water causes the water to boil at a higher temperature. B. Adding salt to the water causes the water to boil at a lower temperature. C. Adding salt to the water has no effect on the temperature of the boiling water. D. There is not enough information for a valid conclusion.

8. Q.O.D. 6.Based on Jeremy's findings, what would be a benefit of adding salt to pasta water? A. There is no obvious benefit of adding salt to pasta water. B. Salt clings to the cooking pot and allows the pot to hold more heat. C. Adding salt to the water chemically breaks down the pasta to make it softer. D. When you add salt to pasta water, the water can get hotter and pasta is cooked faster.

9. Q.O.D. 7a. A control variable is: A.  rarely used in scientific experiments. B. a variable that stays the same throughout an experiment. C. a variable that is changed in an experiment. D. the largest, most powerful variable in an experiment. 7b. Most often, an experiment involving the scientific method begins with a: A. hypothesis. B. observation. C. procedure. D. question.

10. Q.O.D. 8. A cart is rolling down a ramp. If the angle of the ramp is increased to make the ramp steeper, the cart will: A. accelerate slower. B. accelerate at the same rate. C. accelerate faster. D. move at a constant velocity. SPS.6

11. QOD 9. Cartridges used to fire paint balls are filled with carbon dioxide (CO2) gas. Each time a paint ball is fired, some CO2 gas escapes. The volume of the cartridge is rigid and does not change. Deyon buys a new CO2 cartridge. Chris has the same cartridge, but his cartridge has been used to fire several paint balls. Which of the following is true of the cartridges assuming both cartridges are at the same temperature? Answers next---

12. 9. CONT’D-- • The pressure in Deyon’s cartridge is greater than the pressure in Chris’s • The pressure in Deyon’s cartridge is less than the pressure in Chris’s cartridge. • The pressure in Deyon’s cartridge is equal to the pressure in Chris’ cartridge. • No relationship can be determined from the given information. SPS5

13. Q.O.D. 10. What state of matter has a definite volume but no definite shape? • solid B. liquid C. gas D. all states of matter SPS 8 a-d

14. Q.O.D. 11. What state of matter can expand or contract depending on the volume of its container? • solid • liquid c. gas d. none of the states of matter SPS 8 a-d

15. Q.O.D. 12. The kinetic energy of a substance is greatest in which state? A. solid B. liquid C. gas D. each state has equal energy SPS 8 a-d

16. Q.O.D. 13. CALCULATE THE DENSITY D= m (mass) V (volume) • A block of stone material with a mass of 48 grams and a volume of 12cm3. 2. A volume of liquid water with a mass of 12 grams and a volume of 12cm3.

17. Q.O.D. 14. Quamine uses a vice to squeeze 3 containers. Which turns out to be the most compressible? • The solid phase container • The liquid phase container • The gas phase container • The temperature must be known to answer this question. SPS 2,5,7

18. Q.O.D. 15. You heat 50mL of salt water on a Bunsen burner until all the water has evaporated. NaCl crystals are left behind. Which statement describes the result of this action correctly? A. The water has undergone a chemical change. B. The salt has undergone a chemical change. C. The salt and water have decomposed. D. The salt and water have undergone a physical change. SPS5, 2b

19. Q.O.D. 16. Select the freezing point of water on the Celsius Temperature scale. • -273.15 C. • O C. • 32 C. • 273.15 C. SPS 4

20. Q.O.D. The chemical formula for glucose is C6H12O6. 17. How many atoms of carbon make up one molecule of glucose? • 1 B. 3 C. 6 D. 12 18. How many atoms of hydrogen? A. 1 B. 3 C. 6 D. 12 SPS5,2b

21. Q.O.D. 19. Which of the following is an example of kinetic energy? A. a baseball in a locker B. a baseball in the catchers mitt C. a baseball flying in the air D. a baseball stuck in a house gutter SPS8 a-d

22. Q.O. D. 20. Which of the following can be separated by filtering? A. a solution B. compound C. an element D. a heterogenous mixture SPS5, 2b

23. Q.O.D. 21. Which of the following combinations would result in a substance that is chemically different than its components? A. Carbon and oxygen form carbon dioxide B. Sugar and water form a sugar-water solution. C. Copper and tin form bronze D. Oxygen and nitrogen form the air that we breathe.

24. Q.O.D. 22. A good hypothesis: A. is one that can be tested by experiment. B. can be an educated guess predicting the outcome of an experiment. C. can only be formed when you know a little about what is going to happen. D. may be described by all of the above.

25. Question of the Day 23. Which of the following would result in a chemical change? • Boiling • Cutting • Dissolving • Burning SPS5,2b

26. Q.O.D. 24. What is a physical combination of two or more substances called? A. an element B. a compound C. a mixture D. an isotope SPS5, 2b

27. Q.O.D 25. Which of the following is a heterogeneous mixture? Salt water carbon dioxide CO2 c. Bronze d. Vegetable soup

28. Q.O.D. 26. When might a substance absorb heat but not change temperature? A. when it is in its solid state B. when it is changing from one physical state to another C. when it is in its gaseous state D. under no circumstances will a substance absorb heat but not change temperature. SPS 8 a-d

29. Q.O.D. 27. Identify the following substances as an element (E), compound (C), or mixture (M). carbon___ water___ carbon dioxide___ blood___ milk___ sand & sugar _______ calcium ____ chicken noodle soup _____ SPS1,2,5

30. Q.O.D. 28. Calculate the speed of the object from the position vs. time graph shown below. A.0.5 m/sec B. 0.75 m/sec C. 2 m/sec D. 3 m/sec

31. Q.O.D. 29. Newton's first law of motion is also known as: A. the law of universal gravitation. B. the law of force pairs. C. the law of unbalanced forces. D. the law of inertia. SPS6

32. Q.O.D. 30. When compared to a high viscosity liquid, a liquid with a low viscosity: A. must have a lower volume. B. is easier to pour. C. must have a higher density. D. takes longer to pour from one container to another. SPS4

33. Q.O.D. 31. At which of the following points on the graph is the speed the greatest? A. Point 1 B. Point 2 C. Point 3 D. Point 4

34. Q.O.D. 32. Rust is an example of • Oxidation • A chemical change • A physical change • Precipitation SPS5,2b

35. Q.O.D. 33. A rocket can fly into space because: A. when it is launched, the hot exhaust gases hit the ground and push the rocket forward. B. the rocket pushes the exhaust gases backward, and there is an equal and opposite reaction pushing the rocket forward. C. when the gases are burning up, the mass of the rocket decreases, changing the amount of gravity on the rocket. D. the launch pad pushes the rocket forward like a slingshot. SPS8

36. Q.O.D 34. An astronaut is planning a trip to a newly-discovered planet. According to Newton's law of universal gravitation, the astronaut's weight on the new planet will be greater than his weight on Earth if: (A) the new planet has less mass than Earth but the same radius. (B)the new planet has less mass than Earth and a larger radius. (C) the new planet has more mass than Earth but the same radius. (D) The size of the planet doesn't matter. Weight is the same everywhere in the universe. SPS8

37. Q.O.D. 35. A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the book from accelerating downward at 9.8 m/sec2? A. The table presses back up on the book with an equal and opposite force of 20 newtons. B. The table presses back up on the book with a force greater than 20 newtons. C. The table and the book together are accelerating downwards at 9.8 m/sec2. D. The inertia of the book holds it up. SPS8

38. Q.O.D. 36. An astronaut with a mass of 100 kilograms is floating in outer space. If the astronaut throws a 2-kg wrench at a speed of 10 meters per second, his motion would best be described as: A. in the same direction as the wrench at a speed less than 10 m/sec. B. in the same direction as the wrench at a speed greater than 10 m/sec. C. in a direction opposite to the wrench at a speed less than 10 m/sec. D. in a direction opposite to the wrench at a speed greater than 10 m/sec. SPS8

39. Q.O.D. 37. Shadari adds liquid water to an ice tray, and places it in the freezer. What happens? • Thermal energy flows from the higher energy phase(water) to the lower energy phase(cold air). • Thermal energy flows from the higher-energy phase(cold air) to the lower energy phase(water). • Cold radiates from the cold air into the warm water. • The insulation of the ice tray keeps the temperature from changing much. SPS7b

40. Q.O.D 38. Why do we have different units of time? A. for variety B. large units for small times and small units for large times C. large units for large times and small units for small times D. for different kinds of timers SPS8

41. Q.O.D. 39. A marble rolls along the track below with no friction. The sequence of positions on the track listed in order from the lowest kinetic energy to the highest kinetic energy is: A) 1, 5, 4, 3, 6, 2 B) 1, 2, 3, 4, 5, 6 C) 1, 5, 4, 2, 3, 6 D) none of the above. SPS8

42. Q.O.D. 40. What occurs when waves bend around corners or pass through small openings? A. absorption B. reflection C. diffraction D. refraction SPS6

43. Q.O.D. 41. Which of the following is true regarding mechanical waves? • Mechanical waves must travel through matter • Mechanical waves can travel through matter and space. • Mechanical waves can only travel through a vacuum • Mechanical waves can change matter.

44. Q.O.D. 42. Longitudinal waves A. have their oscillations perpendicular to the direction they move in. B. are string vibrations. C. are water waves. D. have their oscillations in the same direction they move in. SPS9

45. Q.O.D. 43. Quan is cold and puts on a hoodie. In a few minutes he feels warm. Why? • The hoodie adds heat to Quan’s body. • The hoodie took heat from the air around Quan’s body. C) The hoodie slowed the heat loss from Quan’s body. D) The hoodie increased the loss of cold from Quan’s body.

46. Q.O.D. 44. A steel ball is released & allowed to roll down a ramp. Identify the statement that describes changes in potential energy (PE) and kinetic energy (KE). • PE & KE are both the greatest mid-way down the ramp. • PE & KE both remain constant. • PE is greatest at the top. KE is greatest at the bottom. D) PE is greatest at the bottom. KE is greatest at the top.

47. Q.O.D. 45. What process does the following describe: “a block of dry ice sitting on a lab bench has a cloud of gas around it?” • Melting • Sublimation • Evaporation D) Fumigation

48. Q.O.D. • X-rays are representative of what type of energy? • Thermal • Nuclear • Electromagnetic D) Chemical

49. Q.O.D. 47. Select the electromagnetic wave with the longest wavelength. • Infrared radiation • Radio waves • Visible light waves • Microwaves

50. Q.O.D. 48. Which of the following statements about suspensions is TRUE? A. A suspension contains particles smaller than those of a solution. B. A suspension cannot be filtered. C. The large particles in a suspension eventually settle to the bottom of the container. D. A suspension is a true solution. SPS6