2. ELEMENT DETECTIVES !!!

3. Remember :Two or more element make up compound. O NaCl O How many elements do you see here ?

4. Sometimes when compounds produce a new substance they leave elements of a chemical change.

5. Remember : An element is represented by a symbol. O It can be an uppercase letter O ex. C Or It can be represented by an UPPERCASE and lower case letter. Ex. Cu

6. Now lets spot some elements… O C 6 H 12 O 6 O CHFeBCoKNa O H 2 O O Si0 2

7. But how can we tell if a new substance is formed ??

8. Checking the evidence !! O The formation of a new substance may be identified by the evidence of a chemical change: O production of a gas O change in temperature O production of a precipitate O color change