Chemistry+Lab+Conclusions

Name: Date: STEM Middle Academy – 8th Grade Science - Mr. Condon Block: Conclusions for Chemistry Labs (Chemical Reactions I, Measuring pH, and Changing pH) Conclusions: (Use the back or extra paper to complete questions as necessary) Attach all 3 labs to this paper in the order listed above. Be sure to have completed all Data Analysis Questions. 1. Chemical reactions occur when new substances are created. Provide at least two examples from these labs of something new being created when chemical compounds are mixed. Be sure to support your claims with evidence. Example 1: Example 2: 2. Litmus paper is a tool to measure a chemical property of hydrogen compounds. Explain how pH can be used to identify compounds with either H+ or OH- ions. 3. In the space below, calculate the molecular weight of: (SHOW YOUR WORK – NEATLY) Sodium bicarbonate (NaHCO3) Acetic Acid (HCH3CO2)

4. How many times stronger of an acid is acetic acid as compared to sodium bicarbonate? Explain your answer.