Outcomes 2.1k- What are caustic materials? What are some reactions that should be avoided? 2.4s- Demonstrate knowledge of WHMIS standards, by using proper techniques for handling and disposing of laboratory materials AF. Safety- Show concern for safety in planning, carrying out and reviewing activities
1.1 Identification of Safety Issues 1) Independently create a list of the safety hazards that appear on the next slide. 2) When asked, turn to your partner and share your ideas 3) Share as a whole class.
Lab Safety – Mind Map Create a mind map by adding lab safety ideas to the following topics Lab Safety ClothingBehaviorsProcedures Prevention
Lab Rules Using the mind maps you created, come up with 5 rules for working safely in the lab Share as a class
Lab Safety Video http://youtu.be/xJG0ir9nDtc http://youtu.be/xJG0ir9nDtc
Safety Scenarios With your assigned group, choose one scenario Create a skit to explain your scenario and the right and wrong way to handle the situation Be ready to share!
Safety Rules 1. Read & know procedure. 2. Wash hands after lab. 3. No food or drink in the lab – no tasting! 4. Wear safety googles always. 5. Waft substances to smell them. 6. Tie back long hair. 7. No flip-flops or open shoes 8. Place test tubes in a test tube rack when transporting and pouring in liquid.
Safety Rules 9. Wipe up spills. 10. Wipe off counter after lab. 11. Place chipped/broken glass in broken glass pail. 12. Label ALL beakers/test tubes. 13. Report all accidents/spills. 14. Stay at your lab bench with your group. 15. Never leave lab bench unattended.
Lab Roles G ROUP M ANAGER R EADS PROCEDURE TO GROUP K EEPS GROUP MEMBERS ON TASK / TIME R ECORDS DATA IN TABLES S UMMARIZES RESULTS TO CLASS C LEANS UP CLASS MATERIALS G OPHER G ATHERS NECESSARY GLASSWARE C ONDUCTS EXPERIMENT C LEANS UP ALL GLASSWARE T ECHNICIAN M EASURES NECESSARY CHEMICALS C OMMUNICATES RESULTS TO GROUP MANAGER C ONDUCTS EXPERIMENT A SSISTS IN CLEAN - UP ( COUNTERS, PUTS AWAY )
These symbols are on household products: Shapes: Household Symbols Caution Warning Danger
WHMIS Symbols Workplace Hazardous Materials Information System Differs from household symbols – WHMIS is worldwide! MSDS- Material Safety Data Sheets Information about each chemical used Ex. Flammability, volatility, mp, bp
WHMIS symbols Where would you see each of these symbols?
Special Note: Caustic – ability to burn or corrode tissue ; refers to strong bases NaOH Corrosive – ability to corrode; mainly refers to acids HCl Corrode – means to “gnaw at” (Latin)
Reactions to AVOID Bleach X ammonia = Chlorine gas (BAD) Used as a chemical warfare agent in WWII – corrosive especially when inhaled +
Assignment Pg. 96 qs. 3, 4, 5, 6, 7 Review as a class when finished
1.2 Classifying Matter 1.2k -How can we classify materials based on properties? 1.2k - How can we classify materials based on their composition?
Try It – On a spare piece of paper How would you group/classify the following items? *Make sure to jot down your justification for your groups.*
1.2 Classifying Matter Matter – any substance that occupies space and has mass Ex. Air, Water Example of non-matter is: Skills Ideas Energy
1.2 Classifying Matter Particle Model of Matter (review) Matter is made of particles Particles attract each other Particles are always moving Particles move faster with higher temperatures Each pure substance has different particles than another substance
1.2 Classifying Matter A. States of Matter SolidLiquidGas MeltingEvaporation FreezingCondensation Deposition Sublimation
1.2 Classifying Matter Draw the particles within the beaker to demonstrate the particle model of matter and states of matter Solid Liquid Gas
1.2 Classifying Matter B. Composition Matter Mixtures Mechanical mixtures Solutions Suspensions Colloids Pure Substances Compounds Elements Made of 1 kind of matter One kind of atom Two or more atoms/eleme nts in a fixed proportion Combo of pure substances Looks like one substance Particles are suspended & hard to separate Particles suspended but can be separated Different parts are visible
1.2 Classifying Matter Examples Matter Mixtures Mechanical mixtures Solutions Suspensions Colloids Pure Substances Compounds Elements Oxygen O 2 H20H20 Vinegar Grape jelly Italian salad dressing Choc chip cookie
1.2 Classifying Matter Heterogeneous mixtureHomogeneous mixture Appear as two or more parts Appear as one Mechanical mixture, suspension, colloid Solutions
1.2 Classifying Matter Solutions can be in different states – don’t let this fool you! Type of SolutionExample Solid in liquidIced Tea – sugar + water Liquid in liquidVinegar – acetic acid + water Gas in liquidPop – carbon dioxide + water Gas in gasAir – Oxygen + nitrogen Solid in solidBrass – copper + zinc
1.2 Classifying Matter C. Properties of Matter Matter can be identified and classified based on physical and chemical properties
Physical property Description Lustre, color, odor, texture, Melting point o C solid liquid Boiling point o C liquid solid Hardness Moh’s scale; ability to resist being scratched (Diamond is 10 – hardest) Malleability Ability to be pounded or rolled into sheets ex. aluminum Ductility Ability to be stretched into long wire ex. copper Crystal shape Salt = cube silicon = diamond shape Solubility Ability to be dissolved ex. Oil is not soluble in water Density Oil is less dense than water Conductivity Electrical or heat Viscosity Rate at which a liquid flows Ex. Molasses is viscous
Chemical Properties Reaction with acids Reaction with water Reaction with air Ability to burn Reaction to heat Video: Chemical vs. Physical PropertiesChemical vs. Physical Properties
LAB: Identifying Mystery Substance Turn to pg. 100-101 Pre-lab: Title Question Outcome – look on outcome sheet and write out the outcome the lab is building on Read through procedure – be ready to answer questions before you are able to enter the lab Safety – list one safety concern of lab and PPE suggested
LAB: Identifying Mystery Substance After the Lab: Analysis: Answer qs. 20, 21, 23 Make sure these are in complete sentences and you are justifying your answers.
1.3 Changes in Matter Outcomes 1.3k- What evidence shows that properties of a material are changed? 1.3k - How do you know if a new substance has been made? Try IT: Turn to pg. 105 Skill Practice
1.3 Changes in Matter Physical ChangeChemical Change Composition stays the same Formation of a new substance with new physical properties Evidence: -State changes -Dissolves Evidence: -change in color -change in odor -formation of solid or gas -release or absorption of energy (cool or hot) Ex. Ice cream meltingEx. Propane burning (combustion)
Practice: Label each of the following as either a Physical (P) or Chemical ( C) change SubstanceP or C Ice cubes melting Burning a candle Getting a haircut Glass of water sweating Alka seltzer tablets fizzing Dry ice smoking at a concert Baking muffins
Return to pg. 105 and check your answers to Skill Practice
LAB: Investigating Physical and Chemical Changes Read through pgs. 106-107 Pre-lab: Title Question Objective – check outcome sheet Evidence Table ** changes: Omit: Changes during and after – make into one column called “Evidence”
LAB: Investigating Physical and Chemical Changes After: Write in evidence table whether physical or chemical In ANALYSIS, provide reasoning for each reaction