Types of Reactions Pre-Lab You must have the completed and balanced reactions that occur at all the lab stations before you can do the experiment.

COMBUSTION STATION EQUATION   EQUATION You need to write the balanced equation for the combustion of magnesium. Note: The combustion of magnesium yields a synthesis reaction. PROCEDURE Get a strip of magnesium ribbon (about 2.5 cm long). Holding it with forceps, ignite the ribbon using the lighter. Do not look directly at the burning magnesium! **Looking directly at the burning magnesium could damage your eyes. OBSERVATIONS After the fire goes out, record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station?  2. What are 2 safety guidelines involved with the handling of magnesium?

3. What is the name of the solid? How do you know? PRECIPITATE STATION EQUATION You need to write the balanced equation for the reaction of aqueous silver nitrate with aqueous sodium chloride in a double replacement reaction.   PROCEDURE Place 10 drops of silver nitrate into a small test tube. Add 10 drops of sodium chloride to the same test tube. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station? 3. What is the name of the solid? How do you know?

SINGLE REPLACEMENT #1 STATION EQUATION You need to write the balanced equation for the reaction where zinc reacts with hydrochloric acid in a single replacement reaction. (Hint: hydrogen acts as the metal ion in the acid.)   PROCEDURE Place a small piece of zinc into a small test tube. Add enough dilute hydrochloric acid (HCl) to just cover the piece of zinc. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station?

SINGLE REPLACEMENT #2 STATION EQUATION You need to write the balanced equation for the reaction where magnesium reacts with copper (II) sulfate in a single replacement reaction.   PROCEDURE Place a small piece of magnesium ribbon (about 10 mm long) into a small test tube. Add enough copper (II) sulfate to just cover the ribbon. Set aside for 5 minutes. Examine the contents of the test tube. If no change is observed, notify your teacher. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station?

DOUBLE REPLACEMENT #1 STATION EQUATION You need to write the balanced equation for the reaction where barium chloride reacts with sodium sulfate in a double replacement reaction.   PROCEDURE Place 10 drops of barium chloride into a small test tube. Add 10 drops of sodium sulfate to the same test tube. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station?

DECOMPOSITION STATION EQUATION You need to write the balanced equation for the decomposition of hydrogen peroxide (dihydrogen dioxide) into water vapor and oxygen gas.   PROCEDURE Place 20 drops of hydrogen peroxide into a small test tube. Add a small amount of manganese (IV) oxide to the tube (about half of a scoop should be enough). HINT: manganese (IV) oxide is a catalyst. It is not a reactant or product, but it speeds up the rate of the reaction. A catalyst is indicated in a chemical reaction by writing the formula of the catalyst over the arrow. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station?

DOUBLE REPLACEMENT #2 STATION   EQUATION You need to write the balanced equation for the reaction where iron (III) nitrate reacts with sodium hydroxide in a double replacement reaction. PROCEDURE Place 10 drops of sodium hydroxide into a small test tube. Add 10 drops of iron III nitrate to the same test tube. OBSERVATIONS Record your observations. QUESTIONS 1. What are the signs that a chemical reaction is occurring at this lab station? 2. List at least one safety guideline for each one of the chemicals used at this station?