Chapter 1 – Intro to Chemistry

1. Chapter 1 – Intro to Chemistry

2. Chemistry and Matter • Chemistry (defn) – study of matter and changes it undergoes • Chemistry is central to ALL sciences • Ex: biology, earth science, astronomy, etc.

3. Matter • Defn – anything that has mass and takes up space • Can you always see matter? • Can you always FEEL matter? • Is everything made of matter? NO UH UH NOPE

4. Mass • Defn – amount of matter something has Does everything have mass?

5. Weight • Defn – measure of earth’s gravitational attraction for matter What weighs more – pound of feathers or pound of bricks? Is the volume equal? Are the overall masses equal?

6. Scientific Method • Defn – systematic approach to solving problems Where do questions come from?

7. Parts of Scientific Method • Observation – act of gathering information, seen directly a) qualitative data – observation made w/o measurement (use 5 senses) b) quantitative data – made w/ measurement 4.4 lbs, 529 cm, $430, 1000 mL

8. Parts of Scientific Method 2. Hypothesis – testable explanation for observations; ask questions Where do hypotheses come from? OBSERVATIONS

9. Parts of Scientific Method 3. Experiment – way of testing hypothesis a) variable – factors that change i) independent variable – variable experimenter changes ii) dependent variable – depends on independent variable STIMULUS RESPONSE

10. Parts of Scientific Method b) control – standard for comparison; stays constant 4. Conclusion – proves/disproves hypothesis 5. Theory – explanation supported by many experiments

11. Parts of Scientific Method 6. Scientific Law – relationship in nature supported by many experiments