CHEM 140 Chapter Notes - Chapter 1-2: Scientific Notation, Significant Figures, Specific Gravity

• School: CSULB
• Department: Chemistry and Biochemistry
• Course: CHEM 140
• Professor: P Pierce

Document Summary

Chemistry is the study of the composition, structure, properties, and reactions of matter. A chemical is a substance that always has the same composition and properties wherever found. Make a hypothesis so that it can be tested. Place values: thousands, hundreds, tens, ones, tenths, hundredths, thousandths. Calculate percentage: parts divided by whole times 100. Direct relationship: volume of gas increases as temperature increases. International system of units is the measurement system for the whole whole besides the us, which does not use the metric system. Chemistry uses the metric system to make measurements. Volume is the amount of space that something occupies=liter and milliliter. Mass is a measure of quantity of something- weight. Mass does not depend on gravity like weight does. Temperature is measured using celsius-water freezes at 0. Measured numbers are numbers that come from measuring something- a quantity.