Presentation on theme: "Essential Question: What are chemical vs physical properties?"— Presentation transcript:
1Essential Question: What are chemical vs physical properties? Warm-up 9/12/11List 5 physical and chemical properties or changes?To do
2Essential Question: What are pennies made of Essential Question: What are pennies made of? How can we use density to help us find out?Select 10 pennies from each container and make sure to separate and before.
3Penny Lab 1) Select 10 Pre-82 pennies and 10 ‘83 and newer 2) Determine the density of each set of pennies.You can use either method to determine volume.3) Find the metal on page R-47 through R-49Make sure it sounds like a reasonable metal4) What other physical or chemical properties could we use to make the final distinction
4Warm-up 9/13/11Get out labs, finish if you have notTurning in today!!Staple table, then calculations, the graph.To do
5Density ProblemsIf 23.6 grams of a substance has a volume of 8.7 mL, what is the substance? How do I know how to round it off?What mass of zinc occupies 58.28cm3 ?23.6 g = = 2.7 to sig figs8.7mLUse yellow packet find density of zincD = m/v7.14g/ml = m/58.28cm3m = 416 grams
6Unit Essential Question: What is density Unit Essential Question: What is density? Daily EQ: Can we graph density?Warm-up 9/13/111) What is the density of 78 grams of aluminum that has a volume of 28.87mL?2) How many grams of gold were found in the ship wreck if it occupied 435cm3 of space (density of gold is g/cm3) ?
7Unit Essential Topic: Physical vs Chemical changes, The battle wages on ! Warm-up 9/12/11Daily EQ: What three things indicate that you have had a chemical change/reaction?Evolution of GasFormation of a precipitate (insoluble solid)Transfer of heat (endothermic or exothermic)
89/13/11 What in the world?Make a list of all the things you noticed when you came in the room today? Everything you saw on the way to your desk
9Scientific Method What are the steps of the scientific method? Observation has to be first2) State the problem3) Form hypothesis4)Perform Experiment5)Collect data6)Analyze data7)Form conclusion8)Repeat
10` Define following variable independent variable – dependent variable scientific method - list stepsaccuracyprecisionTest next Tuesday. Yay!!!
119/14/11If a spider web size is measure on different amounts of caffeine graph the following results1ug –1.5ug –2ug –2.5ug –3.0 ug -
12Make sure you know intensive extensive physical vs chemical density massvolume – 2 ways to findmatter – 3 phases and hamburgerscientific method – all stepsvariables,controls,constants
13Unit EQ: What is the difference btwn Physical and Chemical changes, The battle wages on ! Warm-up 9/14/11Calculate the volume of 68 grams of aluminum. Use back of book.Calculate the volume of 46.7 grams of ethanol. Density ethanol is .7893g/mL.
14Unit EQ: What is the difference btwn Physical and Chemical changes, The battle wages on! EQ: What is chromatography?Warm-up 9/15/111)What is a precipitate?2) Copy graphic organizer on page 50
15Chromatography Lab Get a piece of chromatography paper Make a line across the paper with a vis-a-vis marker 2 cm from one endPlace a mL of water in a beakerTape the chromatography paper to a pencil and hang in middle of beaker, tip if paper just touching the waterWatch and see the magic while working on review sheet
16Test on Thursday! Warm-up A boy is trying to move a desk into his bedroom. The bedroom doorway is 0.97 m wide. The desktop measures 154 cm x 86 cm. Is the desk narrow enough to fit through the doorway? Explain your answer.