2 Page Apparatus: A dynamic trolley, ticker timer, ticker tape, mass blocks, metre stick, trolley runner way Ticker-timer Trolley String Pulley m Ticker-tape Mass Set up the apparatus as shown above or as in any Physical Science textbook 1. What do you think could be the function of the mass block in this experiment?

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not