1. Math Problems on the Science Exam
Goal: To Practice Interpreting Graphs, Reading Charts, and Finding Patterns

3. 3 – 106 degrees F

5. About 85 grams of KBr will dissolve, if the water is at 60 degrees

6. Find the Pattern

7. 10 meters – because the applied force multiplied by the distance from the fulcrum ALWAYS MULTIPLIES TO 100

9. It is CYCLIC (it repeats, up and down)

11. 1 – Population should go down if a new predator is hunting the species

13. 4 – Increases, then remains the same (the Y axis or dependent variable)

15. Mass = 2 kg, because F = ma
For example, in the first row F = 3 and a = 1.5
So mass must be 2, according to the equation

17. 4 – On the Y axis, it is halfway up (medium sized) and on the X axis it is close to 6000

19. 40 joules of friction (because friction and output always add up to 100)
Machine B is the most efficient because it had the most energy output, because it didn’t lose a lot of energy to friction

21. 2 – Plus-58 minutes should equal 10:44

23. 46 – In April and October, the graphs intersect
47 – Thermometer

25. 51. 7% difference in fat
52. We need 20% of 600.
So, we can do 0.2 times 600
Or 1/5 of 600
Equals 120

27. 50. About 36 or 37 grams of solid solute should dissolve (use the X axis first, then move it up until you hit the correct line. Then go to Y axis)
51. As water temperature increases, solubility increases (this makes sense – the hotter a liquid is, the more it can dissolve!)
52. Increase the temperature, stir it, or crush up the solid solute so it can dissolve faster

29. 3 - Mars

31. 1965 to 1970 – Decreased
1970 to 1975 – Increased
Usually, a predator-prey graph has opposite patterns between predator and prey. In other words, if there are more predators, prey will be low. If there are less predators, prey will be high.

33. 72. The Catskills (around 56)
73. Between 36 and 40 inches (37, 38, and 39 are all acceptable answers)

35. Speed is distance divided by time
OR SLOPE OF THE GRAPH
The runner starts out fast (high slope), then slows down…
So the answer is 1) 0-5 minutes

37. There are 3 grams of fat per serving, and 9 servings per container
So 3 times 9 is 27

39. The Calories increases by 9 whenever the running speed goes up by 2
So just add 9
54 calories

41. Latitude: 30 degrees North (3 lines of 10 degrees each)
Longitude: 45 degrees West (3 lines of 15 degrees each)

43. 53. Dependent variable is what you measure – so the pitch
54. Making a mistake measuring the length of the air column, judging the pitch, etc.

45. 1 - Decreases

47. 3 – 75%

49. B is very consistent
1 – Southern hemisphere, because in August it’s not getting much Sun (it’s winter in the Southern hemisphere)

51. 48 – May, just like every other year
49 – Pollution, cutting down trees, or anything else that releases carbon dioxide

53. 1 – As one increases, the other increases

55. 2, because opposites attract
And the poles have the strongest magnetic fields

57. 4 – Ecological succession

59. 2 – Same animal kingdom, different species (remember, species is when they can mate)

61. 4 – Circulatory and digestive

63. Physical change – melting (freezing, evaporation, condensation are all physical changes)
Metals and nonmetals (sections of the table)

65. 2 – The magnet of the train repels the magnet of the track (because they have the same charge)

67. 1 – Chemical reaction
(2 is measuring volume)
(4 is testing hardness with scratching)

69. 3 – A compound is a combination of 2 or more elements.
IT’S NOT A MIXTURE – IN A MIXTURE, NO NEW SUBSTANCES ARE MADE (THEY ARE SIMPLY MIXED TOGETHER)

71. 2 – Weathering is when rock breaks down (ice, acid rain, wind, water)

73. 1 – Refracted (bent)

75. 1 – Microbes are bad bacteria and viruses, so the body destroys them with chemicals

77. 2 - Endocrine

79. 2 – Cellular respiration releases energy from food (basically the opposite of photosynthesis)

81. 4 – Respond to a stimulus (a stimulus is something that stimulates your nervous system)

83. 4 – tectonic plates

85. 4 – A compound

87. 1 – Moist and warm
Because it receives a lot of sunlight, so it’s warm
And Moist because a lot of water evaporates
(think of a rainforest)

89. C – The fully-lit half of the Moon is facing Earth

91. C – Look at the number on the top (atomic number)
4 – I – Anything in the same COLUMN reacts the same
3 – Argon – The noble gases are the COLUMN all the way to the right

93. 2. Inclined plane, and wheel+axle
3 – Friction – friction is a force that slows down many machines

95. 1 – Morning.
A is either 3 hours earlier or 3 hours later.
How do you decide?
If Earth is rotating right (in the picture), then at noon B is right under the Sun. A will be under the Sun in 3 hours, so it’s morning.

97. 2 – Conduction is when particles collide
Convection is when heat rises and falls (swirling)
Radiation is heat from light

99. 3 – Locomotion is movement
3 – Locomotion is movement. The skeleton, muscles, and nervous system work together to react to the environment.

101. 2 – Excretory – The kidneys and bladder work to remove urine (waste) from the body

103. 4 – Oxygen – Cellular respiration is the opposite of plants, so cells TAKE IN OXYGEN, and release CO2

105. 2 – The respiratory system is for getting Oxygen into the body, but also for removing carbon dioxide

107. 2 - decomposers

108. 1 – A community is 2 or more populations (of different species) interacting

110. 2 – Northern hemisphere tilts away from the Sun, so it’s winter in the Northern hemisphere

112. 1 –
Same latitude (about 42.5 degrees North)
Different longitude ( 107 and 70 degrees West)
Longitude is vertical line
Latitude is horizontal

114. 4 – Carbon dioxide
Trees take in carbon dioxide during photosynthesis, so cutting down trees equals more CO2 in the atmosphere
CARBON DIOXIDE WARMS THE ATMOSPHERE
CARBON DIOXIDE IS A GREENHOUSE GAS

116. 2 – mL is a measure of VOLUME, or how much space it takes up
(this particular method is called water displacement)
Mass is weight
Solubility is how much dissolves

118. 4 – Absorption (the second stage of digestion – after food is broken down, it is absorbed)