7th Grade Science 2008 Midterm Review. Copy and print into a WORD document then bring to class.
7th Grade Science Midterm Exam Review 2008
____ 1. Mike is testing the effects of friction on a toy car going down a ramp. He runs one trial with sandpaper on the ramp and another trial with cloth on the ramp. What else does he need in his experiment?
a. a control group
b. a longer ramp
c. an independent variable
d. a technology
____ 2. Mike is conducting an experiment to see if his dog will eat a new brand of dog food. He will replace the dog’s old food with the new brand. Identify the dependent variable in this experiment.
____ 3. Why is it important for scientists to present their findings to the public?
a. The public has to understand every scientific finding.
b. Scientific data can benefit society in different ways.
c. The scientist might be able to get the data published.
d. The scientist needs credit for his or her findings.
____ 4. Clara is conducting an experiment to find out the number of times her lab mice received a reward for finishing a task. She is using a tally chart to keep track of each mouse and the number of rewards each receives.
What is the best type of graph for her to use to analyze her data?
____ 5. Which state of matter do milk, juice, and vegetable oil represent?
____ 6. Which physical property of matter does NOT depend on the size of an object?
a. density
b. mass
c. volume
d. weight
____ 7. If the mass of an object is 10 and its volume is 5, what is its density?
____ 8. Paul is looking around in his environment and observing the kinds of change that occur every day. He makes this chart of examples of change:
cut paper, grind coffee,tear a shirt, bend a paper clip
Which kinds of change do his examples represent?
____ 9. What is the process called when a gas changes into a liquid?
____ 10. Rachel is finding that chemical changes occur in many different ways, like fireflies, campfire, sodium combining with chlorine, and fireworks.
What could you conclude about the chemical changes listed in her chart?
a. Chemical changes do not form new substances.
b. During a chemical change, a substance absorbs energy.
c. Energy is released during a chemical change.
d. The formation of gas is due to a chemical change.
____ 11. Which type of change does a strong odor in rotting food indicate?
____ 12. What scientific law explains that the total mass of matter is the same before and after a physical change?
____ 13. Which is NOT an example of an element?
a. carbon
b. gold
c. silver
d. sodium chloride
____ 14. Which is the most current scientific model of the atom?
____ 15. What does an element’s atomic number represent?
____ 16. Which two numbers do you need to know in order to find the number of neutrons in an isotope?
____ 17. Why would an archaeologist find it useful to know how much of the element carbon-14 is in a fossil?
____ 18. Magnetic and gravitational forces are examples of which type of force?
a. balanced
b. contact
c. non-contact
d. unbalanced
____ 19. Which of the following has a net force of zero?
a. balanced force
b. buoyant force
c. gravitational force
d. unbalanced force
____ 20. Max is pushing a book across a table. When he stops pushing, the book slows down and stops. This is an example of which force?
a. air resistance
b. buoyancy
c. gravity
d. sliding friction
____ 21. Mark is traveling 3 mi north at 2 mph. Which of the following can be figured out with this information?
a. acceleration
b. average speed
c. displacement
d. velocity
____ 22. The Average Speed equation states that average speed in meters per second equals distance in meters divided by time in seconds. If Jan travels 63 m in 7 s, what is her average speed?
____ 23. Donna measured the displacement, 6 km south, and time, 2 hours, for a traveling object.
What is the velocity of the object?
____ 24. After scientists analyze the results of their experiments, they ____.
a. form hypotheses
b. include a control
c. communicate those results to other people
d. choose the variables they want to test
____ 25. Which of the following steps to solve a problem must be completed first?
a. analyzing data c. forming a hypothesis
b. recognizing and identifying the problem d. testing a hypothesis
____ 26. ____ can save time and money by testing ideas that would otherwise be difficult to test quickly or easily.
a. Biases c. Models
b. Conclusions d. Variables
____ 27. A factor in an experiment that is changed on purpose by the experimenter is ____.
____ 28. Scientists conduct multiple trials of their experiments because ____.
____ 29. Which of the following units is part of the International System of Units, or SI?
a. pounds c. meters
b. ounces d. inches
____ 30. The ability of an apple to change color when exposed to air is a ____.
a. physical property c. physical change
b. chemical property d. chemical change
____ 31. The ability of a pond to freeze over in winter is a ____.
a. physical property c. physical change
b. chemical property d. chemical change
____ 32. Which of the following is NOT a possible sign of a chemical change?
a. a change in state c. the release of a gas
b. a change in color d. the release of energy
____ 33. Three examples of physical change are ____.
a. boiling water, a nail rusting, a melting candle
b. a pond freezing, breaking glass, a burning candle
c. melting ice, mowing the lawn, carving a statue
d. applying lipstick, making lemonade, baking bread
____ 34. If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.
a. half-life c. atomic number
b. mass number d. degree of stability
____ 35. Which particles have almost the same mass?
a. proton and electron c. electron and neutron
b. proton and neutron d. all three particles
____ 36. The nucleus is held together by ____.
____ 37. When a car slows down at a traffic light, it is ____.
a. accelerating c. decreasing its displacement
b. traveling at constant velocity d. changing direction
____ 38. Inertia is a measure of the ____ of an object.
____ 39. The unit of force is ____.
____ 40. When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.
a. long-range c. unbalanced
b. action-reaction d. balanced
____ 41. The force that opposes motion is ____.
a. a balanced force c. an accelerating force
b. an unbalanced force d. friction
Matching
Match each term with its description below.
a. hypothesis c. control
b. variable d. SI
____ 42. a factor in an experiment that can change
____ 43. a sample that is treated exactly like the other experimental groups except that the variable is not applied to it
____ 44. a prediction that can be tested
____ 45. a system of units used by scientists that is based on units of ten
Match the type of property with the example.
a. physical property b. chemical property
____ 46. a box measures 4 cm by 3 cm by 8 cm
____ 47. the liquid burned easily
____ 48. the muffins baked for 20 minutes until done
____ 49. the dessert tasted rich and chocolatey
Match the signs of chemical change with the examples of chemical change.
a. the formation of a precipitate c. release of light and heat
b. a change in color d. the formation of a gas
____ 50. burning wood in a fireplace
____ 51. antacid tablet in water
____ 52. solution of sodium nitrate is mixed with a solution of lead nitrate
____ 53. leaving peeled fruit on a kitchen counter
Match the measurement units with the factors that can be measured
a. meter c. kilogram
b. liter d. Celsius
____ 54. mass of an orange
____ 55. volume of orange juice
____ 56. freezing point of carbon dioxide
____ 57. length of a soccer field
Match the measurement with the following.
a. centimeter c. millimeter
b. kilometer d. meter
____ 58. about as wide as a door
____ 59. about as wide as your baby fingernail
____ 60. about as wide as your pencil lead
____ 61. the longest length listed
Match the instrument with what it measures. You may use an answer more than once.
a. balance c. graduated cylinder
b. ruler d. thermometer
____ 62. temperature
____ 63. liquid volume
____ 64. length
____ 65. volume of a rectangular object
____ 66. mass
Choose the correct answer for each problem.
67. 0.30 s after seeing a puff of smoke rise from the starter's pistol, the sound of the firing of the pistol is heard by the track timer 100 m away. What is the speed of sound?
68. A top-fuel dragster accelerates from rest to a velocity of 100 m/s in 8 s. What is the acceleration?
69. A piece of platinum has a mass of 115.83 g. Its volume is 5.4 cm3. What is its density?
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