Presentation on theme: "Essential Question: What are chemical vs physical properties?"— Presentation transcript:
1 Essential Question: What are chemical vs physical properties? Warm-up 9/12/11List 5 physical and chemical properties or changes?To do
2 Essential 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.
3 Penny 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
4 Warm-up 9/13/11Get out labs, finish if you have notTurning in today!!Staple table, then calculations, the graph.To do
5 Density 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
6 Unit 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) ?
7 Unit 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)
8 9/13/11 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
9 Scientific 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!!!
11 9/14/11If a spider web size is measure on different amounts of caffeine graph the following results1ug –1.5ug –2ug –2.5ug –3.0 ug -
12 Make sure you know intensive extensive physical vs chemical density massvolume – 2 ways to findmatter – 3 phases and hamburgerscientific method – all stepsvariables,controls,constants
13 Unit 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.
14 Unit 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
15 Chromatography 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
16 Test 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.