( ( To ( ( ( compare ( ( the properties ) ( of ( molecular ( and ( covalent compounds ) ) ) ) ) ) and ) ( demonstrate ( ( the strength ) ( of ( ( various types ) ( of ( crystal lattice ) ) ) ) ) ) ) ) ( , ( ( have ( students ( use ( ( styrofoam balls ) ( to ( build ( ( two ( different ( crystal lattices ) ) ) ( -LRB- ( ( ( e.g. , ) ( sodium ( chloride ( and ( hydrogen chloride ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (S (VP (TO To) (VP (VP (VB compare) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (JJ molecular) (CC and) (JJ covalent) (NNS compounds))))) (CC and) (VP (VB demonstrate) (NP (NP (DT the) (NN strength)) (PP (IN of) (NP (NP (JJ various) (NNS types)) (PP (IN of) (NP (NN crystal) (NN lattice)))))))))) (, ,) (VP (VBP have) (S (NP (NNS students)) (VP (VB use) (S (NP (NN styrofoam) (NNS balls)) (VP (TO to) (VP (VB build) (NP (NP (CD two) (JJ different) (NN crystal) (NNS lattices)) (PRN (-LRB- -LRB-) (NP (NNP e.g.)) (, ,) (NP (JJ sodium) (NN chloride) (CC and) (NN hydrogen) (NN chloride)) (-RRB- -RRB-))))))))) (. .)))
To compare the properties of molecular and covalent compounds and demonstrate the strength of various types of crystal lattice, have students use styrofoam balls to build two different crystal lattices (e.g., sodium chloride and hydrogen chloride).
(ROOT (S (NP (NP (NNS Compounds)) (PP (IN like) (NP (NN sodium) (NN chloride) (NN form) (NNS structures)))) (VP (VBD called) (NP (NNS crystals))) (. .)))