___________________________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:http://www.bing.com/videos/search?q=physical+vs.+chemical+properties&FORM=HDRSC3#view=detail&mid=D6BF2173877E62CD1986D6BF2173877E62CD1986

Obla Di Obla Da – The Properties Songhttp://www.youtube.com/watch?v=uJOGy0dgmUU

http://www.teachertube.com/viewVideo.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 copperCONs – 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

http://www.teachertube.com/viewVideo.php?video_id=214083

http://vital.cs.ohiou.edu/steamwebsite/downloads/ChangeLab.swfOnline Quiz

What is ___________?

Density is the ______________________

Wood Water Iron

1 cm3 1 cm3 1 cm3

If you take the same volume of different substances, then they will weigh different amounts.

0.50 g 1.00 g 8.00 g

Q) Which has the greatest mass and therefore the most dense?

IRON

http://www.youtube.com/watch?v=GMNpPgLT8Fk

Density = MassVolume

g

mL (for liquids)

or cm3 (for solids)g/mL or g/cm3

Density Equation:

M = D x VV = M / D

http://science360.gov/obj/video/f2511bad-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/cm3

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/cm3

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/cm3

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 Liquid4. Calculate the Mass of Liquid.– How?

• Mass of Liquid = Mass of Measuring Cylinder and Liquid – Mass of empty Measuring Cylinder

• Calculate Density of Liquid.

25.0 g

20.0 ml

45.0 g

45 – 25 = 20 gDensity = m = 20 =1.00 g/mL V 20

25.0 g

Density Practice Problems1. What is the density of a piece of wood that has a mass of

25.0 grams and a volume of 29.4 cm3?

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 5.80cmhas a density of 0.917g/cm3. 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?

http://www.youtube.com/watch?v=LiAvDpl5aJA

How to TEST for GASSES!

Oxygen (O2), Hydrogen (H2) & Carbon Dioxide (CO2) colorless and odorless (for the most part)….

SOOO how can you tell which gas is emitted after a chemical reaction?????