1. Distinguishing Elements and Compounds Elements Compounds Key Differences Breaking down compounds Properties of Compounds Both are Substances

2. Substances and Mixtures Substances Mixtures Definite composition Can be separated chemically Elements and compounds Variable composition Can be separated Physically Homogeneous Heterogeneous

3. Symbols and Formulas Used to represent elements and compounds Chemical Short Hand Chemical symbols 1 st letter is always capitalized 2 nd letter is never capitalized Chemical Formulas Small whole number ratio of elements present H 2 O

4. Section 2.3 Review How are compounds different from elements? How can you distinguish a substance from a mixture? What are chemical symbols and formulas used for? Name methods used to break down compounds into simpler substances.

5. Sec 2.3 review cont. ID each of the following as an element, compound, or mixture. Table sugar Cough syrup Tap water Nitrogen Air Carbon dioxide

6. Compound Analysis Acetaminophen C 8 H 9 O 2 N Name the elements and their ratio in this compound