Chemistry lab report, Exothermic and Endothermic Reactions

1. Add one spatula of Zinc to 10cm3 of Copper Sulfate solution.
2. Add 10cm3 of Copper Sulfate solution to 10cm3 of Sodium Hydroxide solution.
3. Add 10cm3of Sodium Hydroxide solution to 10cm3 of Hydrochloric Acid.
4. Add a strip of Magnesium ribbon to 10cm3 of Hydrochloric Acid.
5. Add 1 spatula full of Ammonium Nitrate to 10cm3 of Water.
6. Add 3 or 4 pellets of solid Sodium Hydroxide to 10cm3 of Water.
7. Add a spatula full of Calcium Carbonate (marble chips) to 10cm3 of Hydrochloric Acid.
8. Obtain crushed ice and half fill your beaker with it. Now add 2 spatulas of Sodium Chloride.
9. Add half spatula of Manganese Dioxide powder to 10cm3 of Hydrogen Peroxide solution.
10. Add one spatula of Zinc to 10cm3 of Hydrochloric Acid.

RESULTS:

Calculations (temp):

• Magnesium + Hydrochloric Acid (Mg + HCL)

Initial temp: 19 oC

Final Temp: 36 oC

Calculation: 36 oC - 19 oC = 17 oC

• Zinc + Hydrochloric Acid (Zn + HCL)

Initial temp: 18 oC

Final Temp: 26 oC

Calculation: 26oC – 18oC = 8 oC

Formulas:

Magnesium + Hydrochloric Acid → Magnesium Chloride + Hydrogen

Mg                +    HCl                →        MgCl2        +        H2

Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen

Zn                +     HCl        →         ZnCl2        +        H2

Balanced Formulas:

Magnesium + Hydrochloric Acid → Magnesium Chloride + Hydrogen

Mg                +   2 HCl                →        MgCl2        +        H2

Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen

Zn                +     2HCl        →         ZnCl2        +        H2

Conclusion:

All reactions that included an acid were Exothermic

Evaluation:

I think we did a great lab, we used time wisely, used accurate quantities, took it seriously, we did not bother in class. Although it could have been improved, well when we took the temperatures we just took the reading while we could of have waited until it reached its maximum or minimum temperature, making the experiment with much more accurate results.

Factors Affecting getting maximum temperatures:

In my opinion there are several variables which affect accurate temperature readings;

• Room temperature
• Quality of thermometer
• Temperature o