From lab: Identify at least 2 sources of error (things that may negatively affect your results).

Initial mass of mixture Mass of iron recovered Mass of 250 mL beaker Mass of sand after drying Mass of beaker with salt (after evaporation) Mass of salt recovered Total mass recovered ABCDEFGABCDEFG E - C B + D + F

1. What is the difference between a chemical and physical change? Day

1. Record your Unit 1 Test grade %. 2. What was the class average %? 3. How did you prepare for the test? 4. How will you prepare for the next test? 5. Set a goal (wait for directions). Day

Setting a goal: If you got > or = 100%, your goal is 100% If you got <100% but an A, you must improve by at least 1 point If you got a B, C, or D, you must improve by at least 2 points If you got an F, your goal must be at least a 65% Day

1.What does an exothermic reaction feel like in lab? 2.What does an endothermic reaction feel like in lab? Day

1.Get your lab out. What mini- experiments do you have left? Day

1.Get your lab out. What mini- experiments do you have left? Day

1.Finish lab and complete postlab – lab packets are due tomorrow! 2.All make up work is due by Thursday 10-2!!! 3. Notebook Checks – volunteers today Day

1.Define science (use your notes from last chapter if you need to). Day

1. What is science? 2. What is chemistry?

Our Definiton the purpose of science: In the simplest terms, science attempts to... EXPLORE and EXPLAIN... the natural world.

How Does Science Accomplish Its Goal? EXPLORE -- By making objective observations of events / phenomenon in nature.

How Does Science Accomplish Its Goal? EXPLAIN -- By applying the principle of cause and effect.

What is Science?

What is Chemistry? Chemistry – study of the composition of matter, and the changes that matter undergoes

Chemistry Is... It is the study of MATTER. OR

Matter Is... Anything that: Takes up space AND has mass

What Is This ‘Stuff’ We’ve Called Matter? One way of defining matter is as the stuff of which everything is made.

The Branches of the Chemis - Tree Inorganic Organic Biochem. Analytical Physical

Organic chemistry – the study of most carbon containing compounds Inorganic chemistry – the study of all substances not classified as organic, mainly those compounds that do not contain carbon Physical chemistry – uncovers the physical laws underlying changes in matter Analytical chemistry – the identification of the components and composition of materials – what’s there and how much Biochemistry – the study of substances and processes occurring in living things

Labs due end of class yesterday / now Review section 1.1 and complete #s 1, 2, 5, 6, and 7 on page 5

1. Branch of chemistry that attempts to determine what’s there and how much = Day

1. How do you accurately measure in science?

Measure the width of your chemistry book.

Always go one more place than marked! __ __ __. __ __ onestens tenths Measure me 6.5

Measure me 7.00 Always go one more place than marked!

Same for measuring liquids! Always go one more place than marked!

Notebook Checks Review section 1.1 and complete #s 1, 2, 5, 6, and 7 on page 5 – DUE BEFORE YOU LEAVE TODAY!!!

Friday 10-3: Read section 2 of chapter 3 and complete #s on page 82