Unit Test: Water & The Water Cycle Grade 7 (Science) Student Name: _________________________ Date: __________________________ Section A: Multiple Choice (10 points) 1) Which of the following is not a source of surface water? A. Lakes B. Rivers C. Groundwater D. Oceans 6) What is the primary purpose of chlorination in water purification? A. To remove large particles B. To kill bacteria and pathogens C. To separate salt from water D. To remove dissolved gases 2) What is the primary source of freshwater on Earth? A. Oceans B. Groundwater C. Glaciers and ice caps D. Atmosphere 7) During which part of the water cycle does water return to Earth’s surface as rain, snow, or hail? A. Evaporation B. Condensation C. Precipitation D. Infiltration 3) Which property of water allows it to dissolve many substances? A. Cohesion B. Adhesion C. Polarity D. Density 4) What part of the water cycle involves water vapor cooling and changing into liquid droplets? A. Evaporation B. Condensation C. Precipitation D. Infiltration 5) Which process is used to remove large particles and impurities from water? A. Boiling B. Filtration C. Chlorination D. Distillation 8) Which method of water purification involves heating water until it boils and then condensing the steam back into a liquid? A. Filtration B. Distillation C. Chlorination D. Boiling 9) Groundwater is primarily found in: A. Rivers B. Lakes C. Aquifers D. Oceans 10) Which part of the water cycle involves the movement of water through the soil and into the groundwater system? A. Evaporation B. Condensation C. Precipitation D. Infiltration 1 S. Butler 2024 Section B: Short Answer (10 points) The diagram shows the water cycle 1. Name the processes occurring at X and Y. (2) X _________________________ Y _________________________ 2. Define "precipitation" in the context of the water cycle. (1) ___________________________ ___________________________ ___________________________ _____________________________________________________________________________ 3. Name two common uses of water in households. (2) _______________________________ __________________________________ 4. What is the role of the sun in the water cycle? (1) ______________________________________________________________________________ 5. Describe one disadvantage of using chlorination to purify water. (1) ______________________________________________________________________________ 6. What is the process called when water vapor turns directly into ice without becoming a liquid first? __________________________________ (1) 7. Give 2 reasons why water is important in the human body. (2) ______________________________________________________________________________ ______________________________________________________________________________ 2 S. Butler 2024 Section C: Matching (10 points) Match the terms in Column A with their descriptions in Column B. Column A Column B 1) Evaporation ___ A. Water returning to Earth as rain, snow, or hail 2) Condensation ___ B. Water moving through soil into the groundwater system 3) Precipitation ___ C. Process of water vapor cooling into liquid droplets 4) Infiltration___ D. Process of liquid water turning into vapor 5) Aquifer ___ E. Underground layer of water-bearing rock 6) Filtration ___ F. Method of removing large particles from water 7) Chlorination ___ G. Adding chlorine to water to kill bacteria 8) Distillation ___ H. Heating water until it boils and then condensing the steam 9) Boiling ___ I. Heating water to 100°C to kill microorganisms 10) Polarity ___ J. Property of water that makes it a good solvent Section D: True or False (10 points) 1) Evaporation is the process where water changes from a liquid to a gas. (True/False) 2) Condensation is the process where water changes from a gas to a liquid. (True/False) 3) Precipitation includes rain, snow, sleet, and hail. (True/False) 4) Infiltration is the process of water moving from the surface to the atmosphere. (True/False) 5) Aquifers are a type of surface water. (True/False) 6) Filtration removes dissolved substances from water. (True/False) 7) Chlorination is used to add minerals to water. (True/False) 8) Distillation can remove both large particles and dissolved substances. (True/False) 9) Boiling water at 100°C for 10 minutes will kill most bacteria and pathogens. (True/False) 10) Water’s polarity makes it a poor solvent. (True/False) 3 S. Butler 2024 Section E: Extended Response (10 points) CHOOSE 1 Instructions: Choose one of the two questions below and write a detailed response. Each question is worth 10 points. Be sure to support your answer with clear explanations and examples where appropriate. • Describe the water cycle in detail. Include and label each part of the cycle in your explanation. • Discuss the different methods of water purification. Explain the advantages and disadvantages of each method (Boiling, Chlorination, Filtration, Distillation). ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Bonus Points- Answer 1- 2 points each • • • • • • What property of water allows it to stick to other substances? What is an aquifer? How does boiling purify water? Name a natural source of groundwater. Describe one disadvantage of using chlorination to purify water. How does filtration help in water purification? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 4 S. Butler 2024