7th Grade Honors Final Exam Practice (Part II)
Base your answers to questions 1 and 2 on the information below and on your knowledge of science.
Solutions of acids and solutions of bases have different properties. Indicators are chemicals that change color
when a solution becomes more acidic or more basic. Some indicators and their colors are shown in the table
below.
1. Explain why testing a solution with only phenolphthalein would not show whether the solution is acidic
or neutral. [1]
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2. Scientists used these three indicators to test a sample of lake water. The results were:
bromthymol blue test — yellow
litmus test — red
phenolphthalein test — colorless
The best conditions for a certain fish species occur when the lake water is neutral, not acidic or basic. Do the
test results show that the lake water is a good environment for this species of fish?
Circle one: Yes No
Explain your answer. [1]
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Base your answers to questions 3 and 4 on the graph below and on your knowledge of science. The graph shows
the concentration of carbon dioxide in parts per million (ppm) in the atmosphere over several years.
3. Based on the graph, predict the month in 2007 when the concentration of atmospheric carbon dioxide
would have been highest. [1]
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4.
The general trend in the graph shows an increase in atmospheric carbon dioxide levels from 2002 to
2006. Describe one human activity that may have produced this increase. [1]
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Base your answers to questions 5 through 7 on the graph below and on your knowledge of science. The
graph shows the solubility curves for a solid solute and a gaseous solute.
5. How many grams of the solid solute will dissolve in 100 grams of water at 25°C? [1]
_____________ g
6.
Describe the relationship between water temperature and the solubility of the gaseous solute from 0°C
to 15°C. [1]
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7. State one way to increase the rate at which a solid solute dissolves in 100 grams of water. [1]
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Base your answers to questions 8 through 10 on the table of mineral properties below and on your knowledge of
science.
8.
Identify the mineral in the table that is hard, has a black streak, and has no reaction with acid. [1]
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9.
Compared to the chalcopyrite, which property of galena is different? [1]
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10. Describe the test for determining the streak of most minerals. [1]
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11. The contour map below shows a hill. Two elevations are labeled. Place an X on the map where an
elevation of 430 feet could be located. [1]
Base your answers to questions 12 and 13 on the map below and on your knowledge of science. The map shows
a region of Earth containing volcanoes and tectonic plate boundaries.
12. What do the arrows on the map represent? [1]
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13. Identify one harmful environmental change that occurs when a volcano erupts. [1]
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Base your answers to questions 14 and 15 on the map below and on your knowledge of science. Points A and B
are locations on the map.
14. On the map above, place an X at 40° N 20° W. [1]
15. Explain why location B will experience sunrise before location A. [1]
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Base your answers to questions 16 and 17 on the information below and on your knowledge of science.
A student performed an experiment in which 10 mL of a strong acid was placed on a sample of limestone.
Bubbles formed where the acid touched the limestone. After 20 minutes, the bubbling stopped and the surface
of the limestone appeared unchanged.
16. Identify one observation that shows a chemical reaction occurred between the acid and the limestone.
[1]
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17. Explain why limestone buildings are weathered by acid rain even though the limestone sample in this
experiment did not appear to be changed by the strong acid. [1]
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Base your answers to questions 18 and 19 on the diagram below and on your knowledge of science. The
diagram represents a cross section of several layers of sedimentary rock that have not been overturned. Each
layer contains fossils.
20. The diagram below represents one position of Earth in its orbit. Points A and B represent locations on
Earth’s surface. Location A is experiencing daylight while location B is experiencing darkness.
What Earth motion will bring location B into daylight in the next few hours? [1]
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21. The model below shows latitude and longitude lines on Earth. Point A represents a location on Earth. The
latitude lines shown are spaced 10° apart and the longitude lines are spaced 15° apart. Determine the latitude
and longitude of location A. [1]
Latitude: _________________ ° N
Longitude: _________________ ° W
Base your answers to questions 22 and 23 on the four maps below and on your knowledge of science. The maps
shows two streams, A and B, on two different dates. The arrows represent the direction of the streams’ flow.
Students studying erosion painted several rocks of similar size, shape, and density. On May 1, they put half of
the rocks in stream A and half of the rocks in stream B. On July 1, the students recorded the locations of the
painted rocks in each stream. The results are shown in the diagram below
22. Explain how this experiment demonstrated erosion. [1]
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23. State one possible reason why more rocks moved farther downstream in stream B than in stream A. [1]
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24. The diagram below shows part of the water cycle. Some processes in the water cycle are represented by A,
B, C, and D.
25. Diagrams A and B show models of how the molecules of the same substance are arranged in two different
phases of matter.
Which phases of matter are represented by diagrams A and B? [1]
Diagram A: _____________________________ Diagram B: _____________________________