Calculating the difference between the mass of air and CO 2 . 49 Production of Hydrogen Gas 1. Students determine whether longer strips of Mg metal produce accordingly more H 2 . 1. Measuring length and volume 1. Graphing 50 Determining the Percentage of Oxygen in the Atmosphere 1.
Students make and test oxygen.
Measuring 52 Batteries 1. Students make and test a battery. Graphing 53 Electrical Conductivity of Solutions 1. Students make a conductivity tester and use it with different solutions. Measuring 54 Electroplating 1.