CH 104 Study Guide - Final Guide: Dinitrogen Tetroxide, Lone Pair, Trigonal Planar Molecular Geometry
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Observations hypothesis experiments theory definite volume definite shape particles in order definite volume no definite shape particles close but can move around no definite volume no definite shape particles far apart and move randomly. A physical change alters the material without altering composition solid water melting liquid water boiling. A chemical change alters the material by altering the composition. It is the conversion of hydrogen balloons reacting to oxygen in the air produces water. Significant figures are all digits in a measured number including one estimated digit. A zero is not significant if: at the beginning of a number at the end of a number without a decimal place. 0. 00245 mg (3 sig figs) between two nonzero digits. 29. 05 g (4 sig figs) at the end of a number with a decimal place. 1245500 m (5 sig figs: lb (3 sig figs) A number has a coefficient (between 1 and 10), and an exponent (positive or negative.
