CHEM 1211K - Observing Chemical Reactions Report Sheet PDF

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lab 01...

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Lab 1 Report Sheet Title:

Date:

Name:

Lab Partner(s):

Purpose: Prepare for the lab by answering the following questions. Use complete sentences, avoiding the use of “I” or “we”. Check with your instructor to see whether you should just respond to the questions or if you should place your responses in a single paragraph. 1. What is the main topic/concept being investigated today? 2. How will you investigate this topic/concept? 3. Write the main definitions and equations needed for today’s experiment.

Reaction Set #1 Table 1: Observations for Reaction (1a) Reagent Initial Observations During Reaction

After Reaction

Reaction type?

Pb(NO3)2

K2CrO4

1

Table 2: Observations for Reaction (1b) Reagent Initial Observations During Reaction

After Reaction

Reaction type?

After Reaction

Gas identity?

Pb(NO3)2

Na2SO4

Reaction Set #2 Table 3: Observations for Reaction (2a) Reagent Initial Observations During Reaction HCl Reaction type? Mg

Table 4: Observations for Reaction (2b) Reagent Initial Observations During Reaction

After Reaction

Gas identity?

H 2O 2 Reaction type? KMnO4

Table 5: Observations for Reaction (2c) Reagent Initial Observations During Reaction

After Reaction

Gas identity?

HC2H3O2 Reaction type? NaHCO3

2

Reaction Set #3 Table 6: Observations for Reaction (3a) Reagent Initial Observations During Reaction

After Reaction

Reaction type?

After Reaction

Reaction type?

NaOH

HCl

Table 7: Observations for Reaction (3b) Reagent Initial Observations During Reaction Water

NH4Cl

Calculations: 1. Provide balanced chemical equations for each of the chemical reactions that you performed. [Reaction (2b) is omitted here.] (1a) _______ Pb(NO3)2 (aq) + ________ K2CrO4 (aq) → ________ KNO3 (aq) + ________ PbCrO4 (s) (1b) _______ Pb(NO3)2 (aq) + ________ Na2SO4 (aq) → ________ NaNO3 (aq) + ________ PbSO4 (s) (2a) _______ HCl (aq) + ________ Mg (s) → ________ MgCl2 (aq) + ________ H2 (g) (2c) _____ HC2H3O2 (aq) + ______ NaHCO3 (s) → ______ NaC2H3O2 (aq) + _____ H2O (l) + _____ CO2 (g) (3a) _______ NaOH (aq) + ________ HCl (aq) → ________ NaCl (aq) + ________ H2O (l) (3b) _______ NH4Cl (aq) → ________ NH4+ (aq) + ________ Cl– (aq)

Analysis & Discussion: 1. Which of the above reactions can be classified as precipitation reactions? [You can list by reaction number.]

2. Which of the above reactions can be classified as gas evolution reactions? 3

3. Which of the above reactions had non-visual clues that a reaction had taken place? In this case, what indicated that a chemical reaction had occurred?

Conclusion Summarize the lab by answering the following questions in your lab notebook. Check with your instructor to see whether you should just respond to the questions or if you should place your responses in a single paragraph. 1. What was the main topic/concept investigated in the lab? 2. How was this concept investigated? 3. What were the main results found in this experiment?

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