Chemistry for life Study Guide 1.A Atomic number, names, and elemental symbol for first 18 elements Steps for water filtration What is an average, filtrate, and filtration? What is electrical conductivity? Explain direct and indirect water usage and give examples of each. 3 states of water and describe. What is ground water, percolation, and acquifer? How does ground water get into the acquifer? How much water does the average household of 4 use? List and describe the steps to the scientific method.