Write the substance and its pH on the strip. Tape it to the scale. Smog can produce acid rain. Look at vials filled earlier. Rearrange vials to hide their identity.
Duck weed is a small plant that lives in ponds.
We will try to grow it under different conditions. Make hypotheses about how much fertilizer your plant needs. Lab Safety - Keep stuff away from eyes and mouth, use things only as directed, ask if you're unsure. Set cups in appropriate light. Observe cups daily and record changes by counting leaves and noting other things.