Unit One Here we go…

Chemistry The relationship between the properties and structure of matter. Always evolving…it is what chemists do!

Chemistry Define serendipity. Alexander Fleming Penicillin, vulcanized rubber Any study of science starts with the scientific method. It is a systematic gathering of information.

Chemistry Demonstration # 1. The rising column.

Chemistry Demonstration # 2. Are my eyes deceiving me?

Summer’s OVER…… Convert: 150 meter to millimeters 97.4 grams to kilograms .00417 kilograms to milligrams

Qualitative vs. Quantitative Qualitative- describes a property without using numbers. Quantitative- describes a property with numbers.

Qualitative vs. Quantitative Give an example of a qualitative measurement of size, color, brightness, length. Give an example of a quantitative measurement of size, color, brightness, length.

Accuracy vs. Precision Accuracy – how close a measurement is to the true value. Precision – how close a set of measurements are to each other

Accuracy vs. Precision

Who is Accurate? Who is Precise?

Accuracy vs. Precision To estimate the accuracy of a measurement, it has to be compared to the correct value. Usually done as a percentage.

Accuracy vs. Precision % Error = accepted - experimental  X 100 accepted value