Matter- anything that has mass and volume Describing matter * Properties- characteristics that help describe and identify matter * Chart on page 12 * Physical property- a property that you can observe without changing one kind of matter into something new * Chemical property- a property that you can observe when one kind of matter is converted into a different kind of matter * Qualitative- describe them in words, but can’t measure or express them numerically *

Quantitative- measured and expressed numerically Using measurements to describe matter * International system of units (S’) allows scientists over the world to rely on a standard system of measurement * Chart (7 base SSL units) Measurement and Uncertainty * Numbers that you can count, conversions and numbers true by definition are exact numbers * The instruments you use and the ability to read and interpret the instruments affect your ability to record and communicate measurements * The digit to the right is always an estimate * Diagram

Significant Digits, Certainty, and Measurements * Significant digits- the digits you record when you measure something, the digits that are certain and a final, uncertain digit that you estimate. How Can you Tell which g TTS Are Significant? * 1. All non-zero numbers are significant * 2.

All zeros located between two non-zero numbers are significant * 3. Zeros that are located to the left of a value are not significant * 4. Zeros that are located to the right off value after decimal is always significant * 5.