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Questions assess inorganic vs organic substances, the definition and interpretation of LD50, and variable identification and conclusions from a fertilizer growth experiment using nitrogen, phosphorous, and potassium. Additional items evaluate lake species responses to changing pH, data classification for monitoring types, and nutritional roles of carbohydrates. Indicator chemistry with bromothymol blue and litmus paper classification also appear, alongside numerical-response tasks and neutralization volume reasoning.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/grade-9-unit-practice-test-science-environmental-chemistry/462706/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/grade-9-unit-practice-test-science-environmental-chemistry/462706.png","ImageObject",300,407,{"name":92,"@type":93},"Franzy","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-27","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":52},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How is LD50 defined in the test?","Question",{"text":112,"@type":113},"LD50 is defined as the concentration of a substance administered that kills half the organisms in the test population.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is the manipulated variable in the fertilizer seedlings experiment?",{"text":117,"@type":113},"The manipulated variable is the brand of fertilizer used on each plant.",{"name":119,"@type":110,"acceptedAnswer":120},"Why does bromothymol blue appear yellow at certain pH levels?",{"text":121,"@type":113},"Bromothymol blue changes color based on pH, and it appears yellow when the pH is below 6.0.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},462706,1791044891,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":52,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},2336478945519,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","Grade 9 Unit Practice Test  \nScience  \nEnvironmental Chemistry  \nALBERTA PROVINCIAL ACHIEVEMENT TESTING  \nCopyright 2020, the Crown in Right of Alberta, as represented by the Minister of Education, Alberta Education, Provincial Assessment Sector, 44 Capital Boulevard, 10044 108 Street NW, Edmonton, Alberta T5J 5E6, and its licensors. All rights reserved.  \nSpecial permission is granted to Alberta educators only to reproduce, for educational purposes and on a non-profit basis, parts of this document that do not contain excerpted material.  \n1. Which of the following substances is inorganic?  \nA. Table salt  \nB. Peanut oil  \nC. Orange juice  \nD. Brown sugar  \n2. Which of the following statements best defines the term LD50 ?  \nA. LD50 is the proportion of the first 50 organisms in a test population that dies when exposed to a particular substance.  \nB. LD50 is the proportion of the first 50 organisms in a test population that becomes sick when exposed to a particular substance.  \nC. LD50 is the concentration of a substance administered to a test population that kills half the organisms in the test population.  \nD. LD50 is the concentration of a substance administered to a test population that makes half the organisms in the test population sick.  \nUse the following information to answer questions 3 and 4.  \nThe following three brands of fertilizer are administered to three seedlings in a controlled experiment.  \nBefore the administration of the fertilizers, each seedling had similar root growth and three leaves. None of the seedlings had developed flowers.  \nComposition of Three Brands of Fertilizer  \n\n|  | Major Components |  |  |\n| --- | --- | --- | --- |\n| Brand | Nitrogen (%) | Phosphorous (%) | Potassium (%) |\n| W | 7 | 15 | 17 |\n| X | 10 | 24 | 5 |\n| Y | 13 | 5 | 10 |\n\nAt the end of a two-month growth period, the following observations are made.  \nCharacteristics of Three Plants Fertilized with Three Brands  \nof Fertilizer  \n\n| Plant | Brand of\u003Cbr>Fertilizer | Number of\u003Cbr>Flowers | Length of\u003Cbr>Roots (cm) | Number of\u003Cbr>Leaves |\n| --- | --- | --- | --- | --- |\n| 1 | W | 15 | 9 | 6 |\n| 2 | X | 5 | 14 | 11 |\n| 3 | Y | 10 | 4 | 16 |\n\n3. What is the manipulated variable in the experiment above?  \nA. The overall growth of each plant  \nB. The length of time that each plant grows  \nC. The amount of water that each plant received  \nD. The brand of fertilizer that is used on each plant  \n4. Which of the following conclusions is supported by the results of the experiment?  \nA. Nitrogen promotes root growth, and phosphorous promotes leaf growth.  \nB. Nitrogen promotes root growth, and phosphorous promotes flower growth.  \nC. Nitrogen promotes leaf growth, and potassium promotes root growth.  \nD. Nitrogen promotes leaf growth, and potassium promotes flower growth.  \n5. Which of the following substances is organic?  \nA. Silicon  \nB. Sulfur  \nC. Sugar  \nD. Salt  \nUse the following information to answer questions 6 to 8.  \n\n| Scientists conducted a study on a particular lake. The data that were collected are shown below.\u003Cbr>Concentration of Organisms of Four Different Species in a Lake as the pH Changed |  |\n| --- | --- |\n| | \u003Cbr>|\n\n6. Which of the following rows classifies the type of data that were collected during the study and identifies the type of monitoring that was conducted by the scientists?  \n\n| Row | Classification | Type of Monitoring |\n| --- | --- | --- |\n| A. | Qualitative | Biological |\n| B. | Qualitative | Chemical |\n| C. | Quantitative | Biological |\n| D. | Quantitative | Chemical |\n\n7. Which species has the greatest number of organisms present in the lake when the water is at a neutral pH?  \nA. Species A  \nB. Species B  \nC. Species C  \nD. Species D  \n8. If acid rain falls into the lake and changes the pH of the water from 6.3 to 5.0, then the species that is expected to increase in number of organisms is  \nA. Species A  \nB. Species B  \nC. Species C  \nD. Species D  \n9. Which of the following roles is played by carbohydr","cbCaiboJXEexy1LD","https://ap.wps.com/l/cbCaiboJXEexy1LD","pdf",918108,14,"English","# Environmental Chemistry Concepts\n## Substance Classification (Inorganic vs Organic)\n## Toxicity Term Interpretation (LD50)\n## Fertilizer Experiment Variables and Conclusions\n## Lake pH Monitoring and Species Response\n## Biological vs Chemical Monitoring Classification\n## Nutrition Role of Carbohydrates\n## Indicator Chemistry (Bromothymol Blue)\n## Litmus Paper Liquid Classification\n## Numerical Response: Neutralization and Coding Tasks","[{\"question\":\"How is LD50 defined in the test?\",\"answer\":\"LD50 is defined as the concentration of a substance administered that kills half the organisms in the test population.\"},{\"question\":\"What is the manipulated variable in the fertilizer seedlings experiment?\",\"answer\":\"The manipulated variable is the brand of fertilizer used on each plant.\"},{\"question\":\"Why does bromothymol blue appear yellow at certain pH levels?\",\"answer\":\"Bromothymol blue changes color based on pH, and it appears yellow when the pH is below 6.0.\"}]","Grade 9 Unit Practice Test - Science - Environmental Chemistry | PDF",1790764967,35]