Classification of Matter I. Composition of Matter Matter SubstancesMixtures -anything that has mass and takes up space ElementsCompounds -particles are all the same -particles are different -particles are the same, and only of one element NaCl 2 O2O2 H2H2 NaClH2OH2O -particles are the same, but of more than one element Heterogeneous Mixtures Homogeneous Mixtures Solutions -particles are unevenly mixed -particles are evenly mixed Sodium chloride (saline) solution Suspensions Colloids -particles are unevenly mixed, won’t settle out -particles are unevenly mixed, will settle out muddy water Jell-O ®

Classification of Matter II. Properties of Matter A. Physical Changes-a ______ in ____, _____, or _____ of _____changesizeshapestatematter -_______ of _____tearingpaper -___________ of _______ B. Chemical Changes evaporatingalcohol -________ of ______freezingwater -_________ of _____dissolvingsugar - still has _____ _________ _________samechemicalproperties -a ______ in ____ ________ in a ________ to a ________ _________ changeonesubstancematerial differentsubstance -_______ of _____ burningpaper -_______ of _______burningalcohol

Classification of Matter II. Properties of Matter B. Chemical Changes 1. Energy -________ of ________ _______evidencechemicalchange -______ is _______ or ________energyreleasedabsorbed -____, _____, or ______heatlightsound 2. Chemical-_________ of ____ ________formationnewchemical -_________ of ________ ___ _______ in _______formationinsolublegasbubblessolution -_________ of ________ _____ __________ (______ out of ________) formationinsolublesolidprecipitate settlessolution -_____ _______colorchange -___ ______ (________ or ________ in _______ or _______), _____ _______of ________ pHchangeincreasedecreaseacidity basicitycolorchangeindicator

Classification of Matter II. Properties of Matter B. Chemical Changes 1. Hypothesis:How Can You Know If A Chemical Change Has Occurred? 2. Prediction: 3. Gather Data: A. Safety:The acid used in this lab is corrosive and causes irritation and damage to the skin, eyes, and mucous membranes. Avoid contact. Use caution. Goggles mandatory.

3. Gather Data: 1. Using the top-loading electronic balance, mass 0.5 g of NaHCO 3 into an evaporating dish. B. Procedure: Classification of Matter II. Properties of Matter B. Chemical Changes 2. Using a 10-mL graduated cylinder, measure out 4.0 mL of 1.0 M HCl solution. Add 5 drops of Universal Indicator solution to the HCl solution in the graduated cylinder. Add the HCl solution to the contents of the evaporating dish. Record evidence of chemical change ____________ ______________________________________________

3. Gather Data: B. Procedure: Classification of Matter II. Properties of Matter B. Chemical Changes 4. Heat the contents of the evaporating dish to dryness on the hot plate. 4. Analyze Data: A. In the lab, you massed out 0.5 g of NaHCO 3. Is NaHCO 3 a substance or a mixture?_______________________________ B. Is NaHCO 3 an element or compound?____________________ 3. Repeat Step 2, adding a second measure of HCl to the contents of the evaporating dish. Record evidence of chemical change_________________________________

Classification of Matter II. Properties of Matter B. Chemical Changes 4. Analyze Data: C. In the lab, you added 4.0 mL HCl solution, which is made by dissolving 36.5 g of HCl into enough water to make one liter. Is the HCl solution a substance or a mixture?______________ D. Is HCl an element or a compound?______________ E. When HCl solution was added to the NaHCO 3 the first time, did a chemical change take place?______ How did you know? ___________________________________________________ 5. Draw Conclusions:

Classification of Matter II. Properties of Matter B. Chemical Changes G. What do you think the white crystalline solid in the evaporating dish was?_______________ H. What do you think the colorless, odorless, gas given off when you added the HCl solution to the NaHCO 3 was? ___________ F. After you added a second 4.0 mL HCl solution to your evaporating dish and heated the material in the dish to dryness, a white crystalline solid was left over in the dish. Was this white crystalline solid NaHCO 3 ?______ How do you know? ___________________________________________________ 5. Draw Conclusions: