1.1 What is Chemistry Objectives Define Chemistry Differentiate between microscopic and macroscopic Know the relationship between pure and applied chemistry ID and describe the 5 primary disciplines of chemistry Real World

1.2 The Scientific Method Objectives Describe how the Renaissance period in history changed the approach to science. Identify the steps of the scientific method. Differentiate between the independent variable and the dependent variable in an experiment. Differentiate between Scientific Theory and Scientific law

1.3 The International System of Units Objectives: Identify the seven base units of the International System of Units. Know the commonly used metric prefixes. Use scientific notation to express large and small numbers. Distinguish between mass and weight. Convert between the Celsius and Kelvin temperature scales. Understand energy as combinations of SI Units.

MeasurementSI Base UnitSymbol LengthMeter m MassKilogram kg TemperatureKelvin K TimeSecond s AmountMole mol Light IntensityCandela cd Electric CurrentAmpere A

1.4 Identify and use conversion factors. Use the method of dimensional analysis to convert between units.

1.5 Uncertainty in Measurements Distinguish between accuracy and precision in measurements. Calculate the percent error of a measured quantity. Report measured values to the correct number of significant figures based on the measuring tool. Perform calculations with measured quantities, rounding the answers to the correct number of significant figures.

Types of Data Data refers to information Qualitative Data Describes something Texture, Color, etc Quantitative Data Measures Something Length, Mass, Time, etc

Determine if each of the following is a qualitative or quantitative measurement. A.The sandwich has ham in it. B.There are four eggs in the carton. C.I used 230 grams of NaOH. D.I added water to the solution.

Measurements Accuracy How close a measurement comes to the accepted answer Precision How close a series of measurements are to each other. How specific an measurement is 10 vs vs

Let’s use a golf analogy

Accurate?No Precise?Yes

Accurate?Yes Precise?Yes

Precise?No Accurate?No

Accurate?Yes Precise?We can’t say!

Accurate? Precise?

Error Accepted value – The right answer Based on reliable references Also called Theoretical Yield Experimental Value- what you get in lab Also called Actual Yield

Measurements Determining Error How far your measurement is from the accepted value.

Percent Error

How many sig figs in the following measurements? mL mL mL mL mL mL mL

1.6 Understanding Density Understand density as a physical property of matter. Perform calculations with derived units, including density.