Chemistry

Stepped Art Figure 3-2 Page 41 Ask a question Do experiments and collect data Formulate hypothesis to explain data Do more experiments to test hypothesis Revise hypothesis if necessary Well-tested and accepted hypotheses become scientific theories Interpret data Well-tested and accepted patterns In data become scientific laws ? 2004 Brooks/Cole ? Thomson Learning Rate of metabolic chemical reactions Heat input from sun and metabolism Heat loss from air cooling skin Heat in body Positive feedback loop Blood temperature in hypothalamus Excess temperature perceived by brain Sweat production by skin Negative feedback loop Figure 3-3 Page 46 Hydrogen (H) 0 n 1 p 1e 1 n 1 p 2 n 1 p 1e 1e Mass number = 0 + 1 = 1 Hydrogen-1 (99.98%) Mass number = 1 + 1 = 2 Hydrogen-2 or deuterium