___________________________ Properties -characteristics that can be _______________________ ____________________changing the composition -Ex. Breaking a glass, dying your hair -Color, __________, odor, taste, melting, __________ & boiling point, magnetism, solubility

Some, but not all physical changes can be _______________. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!

______________________________ Properties -ability of a substance to __________________with or ________________ into 1 or more other substances Ex. Combustible, ___________________, flammability, rusts Physical vs Chemical Properties: w=detail&mid=D6BF E62CD1986D6BF E62CD1986 Obla Di Obla Da – The Properties Song o.php?video_id=129193

Classify each statement as physical or chemical property/change. 1.Pure metals have a higher luster (are shiny and reflect light). 2.The surfaces of some metals become dull when exposed to air. 3.Nitrogen gas, a relatively nonreactive material at room temperature, can form nitrogen oxides at the high temperatures of an operating automobile engine. 4.Milk turns sour if left too long at room temperature. 5.Diamonds are hard enough to be used as a coating for drill bits. 6.Leavened bread dough increases in volume if it allowed to “rise” before baking. 7.Generally, metals are better conductors of heat and electricity than are nonmetals. 8.Unreactive argon gas, rather than air, is used to fill many light bulbs to prevent the metal filament wire inside the bulb from being destroyed through chemical reactions. 9.Metals are typically ductile (can be drawn into wires).

Real Life Problem: Designing the Penny _____ of materials is an issue when manufacturing coins and paper money. – Early _________ copper became too expensive to be used as primary metal in pennies – Zinc replaced most of the copper in all post 1982 pennies PROs - Zinc – about as _______; almost as dense, readily available and less expensive than copper CONs – more ___________________________(zinc-plated steel pennies created in 1943 corroded and looked considerably different)

Solved the penny issue in early 1980s ________________properties best fit for outside of the coin and ____________ properties best fit for inside of the coin (increase coin’s durability and maintain familiar appearance)

__________________ Changes __________________ Changes -changes that alter a substance’s _______________ without changing its composition -chemical reactions -process that involves 1 or more substances changing into _________________________ -Ex. Cutting paper, breaking crystals, melting/freezing ice, boiling water Ex. combusts, rusts, reacts with oxygen, ferments, burns, rots be.com/viewVideo.ph p?video_id= ou.edu/steamweb site/downloads/C hangeLab.swf Online Quiz

What is ___________? Density is the ______________________ WoodWaterIron 1 cm 3 1 cm 3 1 cm 3 If you take the same volume of different substances, then they will weigh different amounts g1.00 g8.00 g Q) Which has the greatest mass and therefore the most dense? IRON 8Fk

Density = Mass Volume g mL (for liquids) or cm 3 (for solids) g/mL or g/cm 3 Density Equation: M = D x V V = M / D 1bad-b43f-4dbd-84f9- ace57941ac90/mass-volume-density NHL Hockey Rinks

DENSITY OF A _________________ SOLID 1.Find the _______ of the solid on a balance. 2.Measure the three lengths and calculate the _____________. (ie V = l x w x h ) Calculate the Density. 4.0 cm 2.0 cm 3.0 cm Density = m = 240 =10.0 g/cm 3 V 24 m = 240 g

DENSITY OF AN _________________ SOLID 1. Find the _____ of the solid on a balance. 2. Fill the Measuring Cylinder with Water to a known Volume. 3. Add the Object. 4. Work out the Volume of Water that is ___________________ 5. Calculate the Density. 50 ml 80 ml m = 360 g Density = m = 360 =12.0 g/cm 3 V 30

DENSITY OF AN _________________ SOLID OR use a Eureka (overflow) Can to find the Volume. 1. Find the ____ of the solid on a balance. 2. Add water until just overflowing. 3. Place a Measuring Cylinder under the spout. 4. Add the Object. 5. Collect the Water and read off the ______________ 6. Calculate Density m = 440 g 40.0 ml Density = m = 440 =11.0 g/cm 3 V 40

DENSITY OF A _____________ 1.Find the ______ of an empty graduated cylinder. 2. Add a certain ___________of Liquid. 3.Find the Mass of the Measuring Cylinder and Liquid 4. Calculate the Mass of Liquid. – How? Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of empty Measuring Cylinder Calculate Density of Liqui d g 20.0 ml 45.0 g 45 – 25 = 20 g Density = m = 20 =1.00 g/mL V g

Density Practice Problems 1.What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm 3 ? 2. A piece of wood that measures 3.0cm by 6.0cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? 3.Would the piece of wood in #2 float in water?

4.An ice cube measuring 5.80cm by 5.80cm by 5.80cm has a density of 0.917g/cm 3. What is the mass? 5. The density of aluminum is 2.7g/ml. If the mass of a piece of aluminum is 244g, what is the volume of the aluminum?

How to TEST for GASSES! Oxygen (O 2 ), Hydrogen (H 2 ) & Carbon Dioxide (CO 2 )  colorless and odorless (for the most part)…. SOOO how can you tell which gas is emitted after a chemical reaction?????