Week+3

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 * __**Topic**__ || __**Activities**__ || __**Downloads**__ ||
 * Mystery Powder Lab || Begin the Mystery Powder Lab, in which they practice making predictions and hypotheses, practice distinguishing between physical and chemical properties. ||  ||
 * Variables || Students take notes on the three kinds of variables and practice identifying variables by reading brief descriptions of scientific investigations. Students complete the Mystery Powder Lab, in which they design a procedure, based upon their background research, to determine the content of several mystery powders. || [[file:Variables wkst.doc]][[file:Variables.ppt]] ||
 * Variables and Experimental Design || Notes on constructing a fair test. A challenge is posed to the group, to determine a procedure that could be performed in-class to find out what physical or chemical property determines whether something will or will not float. ||  ||
 * Significant Figures || Whole group correction of variables worksheet. Students are given rules for identifying sig figs in a single number. Students make up and solve their own problems, then administer them to each other. || [[file:sigfigs.ppt]]
 * Significant Figures || Students are instructed on the use of significant figures when mathematic operations become involved. Go through the problems on the handout as a whole group, using whiteboards. Students work on practice problems in multiple contexts - whole group guided, then whole group unguided, then in pairs. ||  ||