[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-411786-105":59,"doc-detail-411786-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","describing-chemical-reactions-reading-check-key-terms","Describing Chemical Reactions - Reading Check & Key Terms","","Describing chemical reactions explains how reactants interact to produce new products and why the law of conservation of mass must hold. It introduces chemical equations and distinguishes word equations from formula equations, including the role of coefficients for balancing. The material identifies physical indicators of chemical change such as energy release, gas formation, precipitate formation, and color change, while warning that similar signs can occur in physical changes. Reading checks and critical thinking questions reinforce how to name reactants/products and verify atom conservation.",{"@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/describing-chemical-reactions-reading-check-key-terms/411786/",{"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/describing-chemical-reactions-reading-check-key-terms/411786.png","ImageObject",300,407,{"name":92,"@type":93},"Mia  ","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-28",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},"What is the law of conservation of mass in a chemical reaction?","Question",{"text":112,"@type":113},"In a chemical reaction, the total mass of the original reactants equals the total mass of the products. Atoms are not created or destroyed, so the same numbers and types of atoms must appear on both sides of the equation.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How do chemical equations differ from word equations?",{"text":117,"@type":113},"A word equation writes reactants and products in words and does not show quantities. A chemical equation uses symbols and formulas and also shows relative amounts of reactants and products.",{"name":119,"@type":110,"acceptedAnswer":120},"What signs can indicate a chemical reaction has occurred?",{"text":121,"@type":113},"Common indicators include energy release (heat and/or light), gas formation, precipitate formation, and color change. However, some indicators may also happen during physical changes, so other factors must be considered.","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},411786,1790742120,{"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":41,"preview_page_count":4},687207024478,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","# Describing ChemicalReactions\n\nWhen iron rusts,oxygen combines with iron to make ironoxide.Iron and oxygen undergo a process called a chemicalreaction.A chemical reaction is when one or more substancesinteract and produce one or more new substances.The originalsubstances in a chemical reaction are called reactants.The newsubstances that are formed are called the products.In achemical reaction,the total mass of the original reactantsalways equals the mass of the products.This is known as thelaw of conservation of mass.  \nchemical equation  \nprecipitate  \ncoefficient  \nChemical reactions are described by chemical equations.A chemical equation is a way of showing the results of achemical reaction using symbols and formulas.A chemicalequation also shows the relative amounts of the reactants andproducts.For example,the chemical equation below showsthat ammonium dichromate breaks down into nitrogen gas,chromium(III)oxide,and water.  \n## READING CHECK\n\n1.In the chemical equation above,name the reactant(s)and product(s).  \nKEY TERMS  \nwordequation  \nformula equation  \nreversible reaction  \nChemical reactions have physical indicators.  \nThe only way to really know that a chemical reaction hasoccurred is to analyze all the substances before and after thereaction.If the chemical identities of the reactants aredifferent from those of the products,then you know achemical reaction took place.There are,however,otherchanges that are easier to observe that often indicate achemical reaction is taking place.Here are some of thecommon signs of a chemical reaction:  \nEnergy Release When ammonium dichromate decomposes,itreleases energy very quickly.This energy can be observed inthe form of heat and light.Many chemical reactions releaseenergy in the form of heat or light or both.However,therelease of energy can also occur during a physical change,soother factors must also be considered to determine if areaction did take place.  \nGas Formation When vinegar is mixed with baking soda,bubbles of carbon dioxide gas form.The formation of a gaswhen two substances are mixed is a good indicator that theoriginal substances are reacting.  \nPrecipitate A precipitate is a solid that forms during achemical reaction in a solution and separates from thesolution.If a precipitate forms in a container after twosubstances are mixed,a chemical reaction has likely occurred.  \nColor Change Often new substances have different colorsfrom those of the original substances.If the color of asubstance changes,a chemical reaction has likely occurred.  \nObserving these signs only means that a chemical changepossibly occurred.Many of these signs also occur.during aphysical change.For example,boiling water creates a gas,butthe gas has the same identity as the liquid.  \nREADING CHECK  \n2.You mix two clear liquids and a colored solid forms at thebottom of the beaker.Do you think this is a chemicalchange?How can you know for certain?  \nThis ammonium dichromate reactionreleases energy very quickly.  \nWhen solutions of ammonium sulfideand cadmium nitrate are combined,the precipitate cadmium sulfide forms.  \nChemical equations must satisfy the law of conservationof mass.  \nAgood chemical equation will tell you everything you need toknow about a specific reaction.Here are the requirements fora good chemical equation:  \n1.The equation must represent known facts.It accuratelyshows all the reactants and products.These can beidentified by experiments and chemical analysis,or byusing reliable sources for information.  \n2.The equation must contain the correct formulas for thereactants and products.Remember what you have alreadylearned about writing symbols and formulas.Know theoxidation states of the elements,as this will help you writecorrect formulas.Remember that some elements,such asoxygen and hydrogen,are usually diatomic molecules.Some of these elements are shown in the table below.If anelement is not usually found in molecular form,just use theatomic symbol.  \n3.The law of conservation o","cbCaiooT1YorFLkl","https://ap.wps.com/l/cbCaiooT1YorFLkl","pdf",8266597,12,"English","# Describing Chemical Reactions\n## Reading Check\n## Key Terms and Signs of Chemical Reactions\n## Chemical Equations and Conservation of Mass\n## Word and Formula Equations\n## Critical Thinking","[{\"question\":\"What is the law of conservation of mass in a chemical reaction?\",\"answer\":\"In a chemical reaction, the total mass of the original reactants equals the total mass of the products. Atoms are not created or destroyed, so the same numbers and types of atoms must appear on both sides of the equation.\"},{\"question\":\"How do chemical equations differ from word equations?\",\"answer\":\"A word equation writes reactants and products in words and does not show quantities. A chemical equation uses symbols and formulas and also shows relative amounts of reactants and products.\"},{\"question\":\"What signs can indicate a chemical reaction has occurred?\",\"answer\":\"Common indicators include energy release (heat and/or light), gas formation, precipitate formation, and color change. However, some indicators may also happen during physical changes, so other factors must be considered.\"}]","Describing Chemical Reactions - Reading Check & Key Terms | PDF",1790589592]