CHEM 140 Chapter 1-2: Chemistry 140- Chapter 1 and 2

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Chemistry and Biochemistry
CHEM 140
P Pierce

Chem Ch 1 Notes Chem 140 Heading: Notes: ● 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. ● Scientific method: 1. Make observations and ask questions. 2. Make a hypothesis so that it can be tested. 3. Experiments-test the hypothesis. 4. Conclusion: is the hypothesis true or false? Confirmed or modified? ● Scientific method in everyday life ● Place values: thousands, hundreds, tens, ones, tenths, hundredths, thousandths ● Adding and dividing positive numbers ● Calculate percentage: parts divided by whole times 100 ● Graph interpreting ● Direct relationship: volume of gas increases as temperature increases ● Chem Ch 2 Notes Measurements ● 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. Graph on page 24. ● Length=meter and centimeter. - 1m= 100cm,39.4in,1.09yd, ● Volume is the amount of space that something occupies=Liter and milliliter - 1L=1000mL, 1L=1.06qt. 946mL=1 quart ● Mass is a measure of quantity of something- weight. ● 1kg=1000g, 1kg=2.20lb, 454g=1lb ● Mass does not depend on gravity like weight does ● Temperature is measured using celsiu
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