9/19 warm up
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9/19 Warm Up• Question #2: Copy and answer the following:– “Donuts”– PC = (list 2 physical changes)– CC = (list 2 chemical change)– Evidences = (list 2 evidences
of a chemical rxn)
Announcements
• Friday HW: Go to blog and watch – MOTHBALL PRE LAB– Check survey when completed– http://blog.wsd.net/ketaylor/
• Weds 9/25: Parent/Teacher Conf• Thurs 9/26: 1st TEST
Lab Safety with Fire
• Goggles• Everything pulled back• Containers not facing anyone• Glass & metal get hot• Thermometers• Alcohol Burners
Extra Credit Opportunities
• https://docs.google.com/a/wsdstudent.net/file/d/0B3U6xsVWibrQMGFvNXMwd0t3RUE/edit?usp=drive_web&pli=1
• See me or blog for info
Dry Ice Lab Questions
• Here is the equation from the Bromo & Dry Ice?C27H28Br2O5S + CO2 C28H28Br2O7S
• What was the evidence a chemical reaction occurred with the Bromo. Blue solution?
• What was the evidence a chemical rxn occurred with the phenol red?
• What was a physical change that occurred?
Phase Changes
• http://www.harcourtschool.com/activity/states_of_matter/
PHYSICAL PROPERTYDraw 1 example of a physical propertyExplain why it is a physical property
CHEMICAL PROPERTYDraw 1 example of a chemical propertyExplain why it is a chemical property
PHYSICAL CHANGEDraw 1 example of a physical changeExplain why it is a physical change
CHEMICAL CHANGEDraw 1 example of a chemical changeExplain why it is a chemical change
Evidences of Chemical Rxns
• http://www.buzzfeed.com/awesomer/coolest-chemical-reactions
• Think of the evidences for the chemical rxns
REVIEW: To yourself, answer if the examples are physical changes or chemical changes
• Tearing paper• Burning paper• Breaking wood• Campfire• Mixing kool aid• Cooking a cake• Heating H2O boils
Physical change
Physical change
Physical change
Chemical change
Chemical change
Chemical change
Physical change
Property or Change?
• Liquid has a boiling point• 2 different liquids mix bubbles• Food coloring can mix with water• Burning an egg• It has a yellow color• It produced a smell• Non-flammable• Hardness of 7
Property
Property
Property
Change
Change
Change
Property
Property
• Which of the following is an example of a chemical property of water?– A. Boils at 100 C– B. Is transparent– C. Has no odor– D. Reacts with calcium
Is it still water (H2O)
Transparent = see through/clear
No smell
Reacts = chemical reaction
• Which of the following is an example of a physical property of hydrogen? It
• A. Is less dense than air• B. Reacts with oxygen• C. Is highly flammable• D. Forms hydrochloric acid
PHYSICAL PROPERTY
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