Warm Up Direction: Copy the questions and provide answers 1.Why is the scientific method useful? 2.What is the difference between theory vs. law? 3.What do you do if you accidentally break a beaker during lab? Agenda Turn in poster & syllabus Lab: Mass Notes Unit 1-1 Homework Aug 20 – Lab safety quiz Aug 21 - Extra credit online due before 9PM

Warm Up Direction: Copy the questions and provide answers 1.What is the proper method when mixing acid and water? 2.Which of the 3 objects was the heaviest from the mass lab? 3.When do you use the eye wash station? Agenda Notes Unit 1-1 Finish Lab: Mass Homework -Lab safety quiz Aug 21 - Extra credit online due before 9PM

Unit 1-1 Properties and Changes of Matter A chemical is any substance that has a definite composition -It is always made of the same stuff no matter where the chemicals come from -Some chemicals exist naturally, like carbon dioxide -Some chemicals are manufactured, like polyethylene (plastic)

Properties and Changes of Matter A chemical reaction is the process by which one or more substances change to produce one or more different substances. - Chemical reactions take place all around you and inside you all the time: cooking food, digesting food, taking a photograph, striking a match, or driving a car.

States of Matter Matter is anything that has mass and volume - All matter is made of particles- the type and arrangement of the particles determine its properties

States of Matter Solids have fixed volume and shape Particles in a solid are held tightly in a rigid structure and vibrate only slightly

States of Matter Liquids have fixed volume but not a fixed shape Particles in a liquid slip past each other, giving them the ability to flow and take the shape of their container

States of Matter Gases have neither fixed volume nor shape Gas particles move at a high speed and will fill any container they occupy

Changes of Matter Physical changes – Physical changes are those in which the identity of the substance does not change – Changes in state of matter are also physical changes -The process of dissolving sugar in ice tea is an example of a physical change -The arrangement, location, and speed of the particles might change

Changes of Matter Chemical changes – In a chemical change, the identities of the substances change and new substances form - Example: Respiration C 6 H 12 O 6 + O 2  H 2 O + CO 2 Reactants Products

Changes of Matter Evidence of chemical change 1.Evolution of a gas (bubbles) 2.Formation of a precipitate (solids floating in a liquid) 3.Release or absorption of energy (it gets hot or cold) 4.Color change

Lab Mass Find your lab group Send 1 person up to get the scale & 1 for the objects Follow the procedure on your hand out and record your data Part 2 - Weight your vial first then add 10 grams of water into it. Then add 1 gram of oil in the water.

Scientific Method Review SpongeBob notices that his pal Gary is suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odor. His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure, while Sandy says that drinking Dr. Kelp will be a better cure. SpongeBob decides to test this cure by rubbing Gary with seaweed for 1 week and having him drink Dr. Kelp. After a week of treatment, the slime is gone and Gary’s shell smells better. 1. Initial observation? 2. Dependent and Independent variable? 3. What should SpongeBob conclusion be?