University:
Emory University
Course:
CHEM 141 | General Chemistry I
Academic year:

2021
Views:

27

Pages:

2
Author:

Carina Becker

VIRTUAL LAB: 5 TYPES OF CHEMICAL REACTIONS OBJECTIVE: Be able to identify the five types of chemical reactions and predict their products PRE-LESSON RANKING: Scroll down to the bottom of the page to determine your initial rank 1. Type of Reaction:_ Decomposition Observations before reaction: Observations after reaction: - coloured liquids in a graduated cylinder - coloured foam overﬂowing out of the graduated cylinders - some materials used can be found in any common household Word equation: hydrogen peroxide = oxygen gas + water Skeleton equation: Balanced H2O2 = O2 + H2O equation: 2H2O2 = O2 + 2H2O 2. Type of Reaction:_ Double Replacement Observations before reaction: - yellow substance (potassium chromate) Observations after reaction: - a red substance (appearing solid) is now in the test tube - clear substance (silver nitrate) Word equation: potassium chromate + silver nitrate = potassium nitrate + solid silver chromate Skeleton equation: Balanced K2CrO4 + AgNO3 = KNO3 + Ag2CrO4 equation: K2CrO4 + 2AgNO3 = 2KNO3 + Ag2CrO4 3. Type of Reaction:_ Combustion Observations before reaction: - Clear ethanol is being poured into a large water bottle Observations after reaction: - water is produced as the bottle gets compressed Word equation: ethanol + oxygen gas = carbon dioxide + water Skeleton equation: C2H6O + O2 = CO2 + H2O Balanced equation: C2H6O + 3O2 = 2CO2 + 3H2O 4. Type of Reaction:_ Single Replacement Observations before reaction: Observations after reaction: - hydrochloric acid and zinc pellets are put together inside a ﬂask - The hydrogen gas produced, ﬁlled the balloons with air (blowing them up) Word equation: zinc + hydrochloric acid = zinc chloride + hydrogen gas Skeleton equation: Zn + HCl = ZnCl2 +H2 Balanced equation: Zn + 2HCl = ZnCl2 +H2 5. Type of Reaction:_ Synthesis Observations before reaction: Observations after reaction: - iron and sulfur are together in a beaker - they become a dark green substance -they joined together in one solid block when heat was added Word equation: NOTE! This should be Fe(II), NOT Fe (I) iron(ii) + sulfur = iron(ii) sulﬁde Skeleton equation: Fe + S = FeS Balanced equation: Fe + S = FeS OBJECTIVE: Be able to identify the five types of chemical reactions and predict their products yes POST-LESSON RANKING: 4 _Are you sure? Did you double check what the rankings mean? If you rank yourself a “4”, Grand Master, you should be able to get out of your seat and teach someone in the class who is struggling. 1-JEDI APPRENTICE: 2-JEDI KNIGHT: -You seem to have never heard of the concepts, young padawan -Content seems familiar but you don’t truly know it. -Your understanding is an incomplete mess and you could ruin the Alliance -You are getting stuck and making lots of rookie mistakes possibly due to effort. 3-JEDI MASTER: 4-GRAND MASTER: -You know content well enough but need to clarify details. -Tutor, you could, and teach these concepts so you are an “expert”. -You are still making some small errors and are a little short of a full lightsaber with your use of the Force -No mistakes made on multiple practice problems and everything is complete