Matter, Measurement, and Problem Solving Principles of Chemistry: A Molecular Approach 2e (Tro) Chapter 1 Matter, Measurement, and Problem Solving 1) Molecules can be described as A) a mixture of two or more pure substances. B) a mixture of two or more elements that has a specific ratio between components. C) two or more atoms
INTRODUCTION TO CHEMISTRY NOTES METRIC SYSTEM UNIT FOR: 1) Mass 2) Volume 3) Length 4) Time 1) gram 2) liter 3) meter 4) second METRIC ABBREVIATIONS: 1) 1,000,000 2) 1000 3) 100 4) 10 1) mega 2) kilo 3) hecto 4) deka EXPRESS: 1) 100 GRAMS 2) 1/10 LITER 3) 1000 METERS 4) 0.001 GRAMS
The scientific method: To understand a given phenomenon. Steps in scientific method 1- Making observation Qualitative : no numbers Example: The sky is blue and water is liquid Quantitative (called measurement): number+ unit Example: Water boils at 100 °C 2- Formulating hypothesis Hypothesis is a possible explanation for an observation 3- Performing experiments to test