Overview

Here you will find material for Experiment 3 - An Introduction to Chemical Reactions. This includes detailed guides for the pre-lab, data sheet, post-lab, and quiz questions. Remember, the lab may change or be modified from semester to semester!

Background Knowledge (links):

  1. Lab Manual

  2. Youtube

    1. Conservation of Mass

    2. Theoretical Yield

Objective: demonstrate the principle of conservation of mass with chemical reactions (double replacement, metathesis, combustion, dehydration, decomposition, acid and base).

 

PreLab

The pre-lab is completed before performing the experiment and will be turned in at the beginning of lab. It uses the same template for every experiment and can be found on BB. For more information, see Pre-Lab Report Template page.

Below you will find the the pre-lab broken down into sections. Remember, the lab may change or be modified from semester to semester. This material is only meant to be a guide!

*NOTE Experiment was modified with the following steps for this particular semester:

  1. Page 15: Equation AgNO3 + KI -> AgI + KNO3

  2. Page 17: Silver nitrate (AgNO3) (0.2g) used instead of Pb(NO3)2.

  3. Page 18, items 26-27: 0.1 g CuSO4*5H2O dissolved in 5 mL H2O in test tube. NH3 added dropwise in hood, record observation with # of drops

  4. Page 18, items 28-29: 0.1 g of solid COCl2 used. Then record observation with # of drops

  5. Page 19: Reactions 7-8 NOT performed

 
 
 
 

Data Sheet

These reactions are to illustrate the conservation of mass.

  • You will record the reactants used and the actual yields.

  • You will be asked to explain the difference between the expected and actual yields.

  • You will be asked to describe your observations

  • Below are SAMPLE values, explanations of the difference between expected and actual yields and observations of rxns

 
 

PostLab

  1. Asks you to provide examples of each of the following types of reactions NOT used in this lab. Just Google it.

    • Metathesis

    • Decomposition

    • Combustion

  2. Asks you to give tow examples of reactions, NOT included in this experiment, in which a gas is produced. Again, just Google it.

  3. Asks you to predict the products and write balanced equations for the given reactions.

    • Google: “chemical equation balancer” or

    • Do it manually