Chemical Reactions Lab

Today in Chemistry we performed a lab that had 11 different experiments that had to be performed to show us the different types of chemical reactions that occur. There are three major indicators that tell us if they are true chemical reactions, which include: a precipitate forming, color change and the appearance of bubble/fizzing. During each mini lab at least one of each indicators was seen, for example me and my partner performed reactions 5 and 8 which was assigned to us by our teacher. Reaction number 5 resulted in turning a milky white, became increasingly hot and had big bubbles that kept fizzing out and in reaction number 8 it turned a bright yellow color. I believe that the products of reactants can be predicted because the atoms in the reactants are the same, so the outcome will always be the same.The reactions were divided up into five sections: Section 1 (Reactions 1 and 2); Section 2 (Reactions 3 and 4); Section 3 (Reactions 5 and 6); Section 4 (Reactions 7, 8 and 9); and Section 5 (Reactions 10 and 11).

This was done based on similarity:

Section 1: Two reactants that produced one product.  Ex: 4Fe+302=2Fe203                                                                                           Section 2: One reactant that produced two or more products.  Ex: 2H202=2H20+02                                                                                 Section 3: One element or ion is replaced by another element/ion in a compound.  Ex: Zn+Pb(NO3)2=Pb+Zn(NO3)2                               Section 4: Two compounds exchanged their elements/ions for those of the other compound.  Ex: Pb(NO3)2+2KI=2KNO3+PbI2               Section 5: Combustion. Ex: CH4+O2=CO2+2H2O

Here are the balanced chemical equations for the 11 chemical reactions:

1. 4Fe(s) + 3O2(g) –> 2Fe2O3(s)

2. CaO(s) + H2O(l) –> Ca(OH)2(aq)

3. 2H2O2(l) —MnO2–> 2H2O(l) + O2(g)

4. 2NaHCO3(s) –> H2O(l) + Na2CO3(s) + CO2(g)

5. Ca(s) + 2H2O –> H2(g) + Ca(OH)2(aq)

6. Zn(s) + Pb(NO3)2(aq) –> Pb(s) + Zn(NO3)2(aq)

7. Na2CO3(aq) + Ba(NO3)2(aq) –> 2NaNO3(aq) + BaCO3(s)

8. Pb(NO3)2(aq) + 2KI(aq) –> 2KNO3(aq) + PbI2(s)

9. CaCO3(s) + 2HCl(aq) –> CO2(g) + H2O(l) + CaCl2(aq)

10. CH4(g) + 2O2(g) –> CO2(g) + 2H2O(g)

11. 4C2H5O2(l) + 9O2(g) –> 8CO2(g) + 10H2O(g)

Image

 Ca(s) + 2H2O –> H2(g) + Ca(OH)2(aq)

Image

Pb(NO3)2(aq) + 2KI(aq) –> 2KNO3(aq) + PbI2(s)

Sources:

Lab Notebook/Notes

Lab Results

In Class Discussion

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s