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Investigation: Types of Chemical Reactions

Introduction: There are four basic types of chemical reactions. This lab willintroduce you to each of these reaction types. You willperform examples of each reaction type and write wordequations and balanced chemical equations for each reactionperformed.

Your Report must include: Purpose, Hypothesis (for each part), Reference toaterials and Procedure, !"" #bser$ation tables, %iscussion questions, &onclusion

Part 1: Synthesis Reactions: The Combustion of agnesium!

'. Hold a piece of manesium ribbon with tons in the hottest part of the flame, butremo$e the ribbon from the flame as soon as the reaction starts. %# #T "##*%+R&T"Y !T TH P+& #- !/+0 1H +T R!&T/.

2. Record your obser$ations.

Results:Starting aterial "escription of

Starting aterial

#bservations during

Change

"escription of

Products

manesium ribbon

oxyen as

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Part $: "ecomposition Reactions: The "ecomposition of agnesium Carbonate!

'. #btain one or two scoops of manesium carbonate in a test tube. Record theappearance of the manesium carbonate.

2. Record the mass of the test tube and manesium carbonate.3. ount the test tube in a nearly hori4ontal position and tap the test tube so thatthe manesium carbonate lies alon the side of the test tube and does not allremain at the bottom.

5. #btain a second test tube rouhly 6 full of lime water.

7. ently heat the mounted test tube, ma8in sure to distribute the heat e$enlyalon the side of the tube underneath the manesium carbonate.

9. Position the second test tube so that any as produced in the reaction can :flow;into the lime water. !fter about four minutes of heatin, stopper the lime watertest tube and sha8e its contents. Record your obser$ations.

. 1hen the test tube is cool record the mass of the test tube and product.

Results:

Starting

aterial

"escription of

Starting aterial

#bservations

during Change

%as Test "escription of

Products

magnesium

Carbonate

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Part &: Single "isplacement Reactions agnesium and 'cid!

'. !dd sulfuric acid (H2/#5 (aq)) to a test tube to a depth of about 2 cm.

2. !dd a few pieces of manesium to the test tube. #bser$e the reaction and testthe as produced with a burnin splint. Record your obser$ations.

Results:

Starting

aterial

"escription of

Starting aterial

#bservations

during Change

%as Test "escription of

Products

anesiumPieces

/ulfuric !cid

Part (: "ouble "isplacement Reactions i)ing Solutions!

'. !dd two drops of each solution to the microtray wells a shown in the table below.

2. Record your obser$ations, notin the appearance and colour of any product.

3. 1ash and clean up all lab materials as instructed by your teacher. 1ash yourhands.

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Results

&opper (++) itrate ic8el (++) itrate +ron (+++) itrate

/odium Phosphate

/odium &arbonate

/odium +odide

"iscussion *uestions

'. 1rite a word equation !% a balanced chemical equation for each of thereactions that you obser$ed in the in$estiation.

2. -or each of the reactions obser$ed, what e$idence is there that a chemicalchane occurred?

3. +n the synthesis reaction, manesium reacted with oxyen to produce manesiumoxide. 1ould you expect the mass oft he product to be hea$ier or lihter than themass of the manesium ribbon before the reaction? xplain.

5. + the decomposition reaction, the manesium carbonate was weihed beforethan after the reaction. 1ould you expect the mass of the manesium carbonateafter the reaction to be hea$ier or lihter than it was before the reaction? xplain

7. anesium carbonate, when heated, decomposed into two products. #ne ofthese products was a as. 1hat as was produced? 1hat test was performed todetermine this?

9. 1hen manesium pieces reacted with sulfuric acid, a as was produced. 1hat

as was produced? 1hat test was performed to determine this?

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>. %escribe all of the safety precautions that were ta8en durin this lab.