Rio Salado CHM 130 Midterm Exam Questions and Answers

Chemistry A science that studies the composition of substances and the way they interact with other substances. Steps of the Scientific Method 1. Observation 2. Hypothesis 3. Experiment 4. Conclusion Metric system Length (meter), Volume (liter), Mass (gram), Temp. (C), Time (second) SI system Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin), Time (second) Scientific Notation a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6 x 10-4 g) Measured Number numbers you obtain when you measure a quantity using a measuring tool Significant Figures are all the digits including the estimated digit. All nonzero numbers are counted as significant figures. Exact Numbers numbers obtained by counting items or using a definition that compares two units in the same measuring system. Kilo- 1 000 mega- 1 000 000 deci- 0.1 centi- 0.01 milli- 0.001 micro- 0.000 001 Conversion Factors An equality written as a fraction.