- melting
- freezing
- condensation
- evaporation
- vaporization
- sublimation
- plasmafication
- Boyle's Law
- Charles's Law
- Heat
- endothermic
- exothermic
- freezing point
- melting pt.
- condensation pt
- vaporization pt.
- CHARACTERISTIC PROPERTY
- heat
- temperature
Monday, October 10, 2011
Additional Vocabulary on Physical Change
Why does that happen? Do Now # 11
Do Now #11? Why do our ski goggles or car windshield gets foggy, drinks sweat, ice forms on the outside of our windows when it hasn't rained, and why do clouds form?
http://www.ptable.com/
http://www.ptable.com/
Wednesday, September 28, 2011
States of Matter Game
Tuesday, September 27, 2011
Bose Einstein Condensate - 0 Degrees Kelvin - Zero Energy
OK Zach, Bend your mind around this.
not really the same thing but here is a video about liquid metal that is mind blowing.
Sunday, September 25, 2011
Vocabulary
Do Now #11. What is your best method for learning new vocabulary?
- solubility
- solute
- solvent
- concentration
- dilute
- dissolve
- solution
- mixture
- chemical property
- physical property
- malleability
- ductility
- funkychicken
- thermal conductivity
- reactivity with
- flammability
- state of matter
- plasma, another plasma link
- define gas
- define liquid
- define solid
- define phase change
- thermal energy
- heat
- temperature
- vaporization
- condensation
- freezing
- melting
- sublimation
Tuesday, September 20, 2011
Do Now #10 - Law of Conservation of Mass
Do Now # 10: What is the law of conservation of mass/matter and does it make sense to you? Why or why not?
1. You have a 20Kg block of wood in a fire. An hour later there is 1 Kg of black ash. What happened to the other 19 Kg?
2. You add 20 gallons of fuel to your car. How much does that mass in Kg? After a week you have only 1 Kg of fuel left in your car, what happened to the other _______Kg?
1 US gallon = 3.78541178 liter and the density of Fuel lets say is .7g/mL
3. Lets imagine a tree absorbing 100 Kg of of CO2 per year. Lets also say it emits 73Kg of oxygen back into the atmosphere. What happened to the other 27%?
4. The U.S. gets about 52% of all its energy for electricity from Coal fired power plants. 1.39 x10 e12 pounds of coal were consumed last year for the production of energy. How much Carbon Dioxide was emitted into the atmosphere?
5.
1. You have a 20Kg block of wood in a fire. An hour later there is 1 Kg of black ash. What happened to the other 19 Kg?
2. You add 20 gallons of fuel to your car. How much does that mass in Kg? After a week you have only 1 Kg of fuel left in your car, what happened to the other _______Kg?
1 US gallon = 3.78541178 liter and the density of Fuel lets say is .7g/mL
3. Lets imagine a tree absorbing 100 Kg of of CO2 per year. Lets also say it emits 73Kg of oxygen back into the atmosphere. What happened to the other 27%?
4. The U.S. gets about 52% of all its energy for electricity from Coal fired power plants. 1.39 x10 e12 pounds of coal were consumed last year for the production of energy. How much Carbon Dioxide was emitted into the atmosphere?
5.
Sunday, September 11, 2011
Hot Air Balloons and the Mass of Air - DO NOW : #9
Do Now # 9 Does Air Have Mass? How do we know?
Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. A cubic foot of air weighs roughly 28 grams (about an ounce). If you heat that air by 100 degrees F, it weighs about 7 grams less. Therefore, each cubic foot of air contained in a hot air balloon can lift about 7 grams. That's not much, and this is why hot ir balloons are so huge -- to lift 1,000 pounds, you need about 65,000 cubic feet of hot air.
Mass of Air
1.21kg/m3 at 20 deg C at sea level
1.16kg/m3 at at 30 deg C
Read How Stuff Works For More Info
Air is a mixture of gases and the total mass can be estimated by adding the weight of all major components as shown below:
Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. A cubic foot of air weighs roughly 28 grams (about an ounce). If you heat that air by 100 degrees F, it weighs about 7 grams less. Therefore, each cubic foot of air contained in a hot air balloon can lift about 7 grams. That's not much, and this is why hot ir balloons are so huge -- to lift 1,000 pounds, you need about 65,000 cubic feet of hot air.
In simple terms, density is the mass of anything - including air - divided by the volume it occupies. In the metric system, which scientists use, we usually measure density in terms of kilograms per cubic meter. The air's density depends on its temperature, its pressure and how much water vapor is in the air. We'll talk about dry air first, which means we'll be concerned only with temperature and pressure
Mass of Air
1.21kg/m3 at 20 deg C at sea level
1.16kg/m3 at at 30 deg C
Read How Stuff Works For More Info
Components in Dry Air
The two most dominant components in dry air are Oxygen and Nitrogen. Oxygen has a 16 atomic unit mass and Nitrogen has a 14 atomic units mass. Since both of these elements are diatomic in air - O2 and N2, the molecular mass of Oxygen is 32 and the molecular mass of Nitrogen is 28.Air is a mixture of gases and the total mass can be estimated by adding the weight of all major components as shown below:
| Components in Dry Air | Volume Ratio compared to Dry Air | Molecular Mass - M(kg/kmol) | Molecular Mass in Air |
| Oxygen | 0.2095 = 20.95% | 32.00 | 6.704 |
| Nitrogen | 0.7809 = 78.09% | 28.02 | 21.88 |
| Carbon Dioxide | 0.0003= .03% | 44.01 | 0.013 |
| Hydrogen | 0.0000005= etc | 2.02 | 0 |
| Argon | 0.00933 | 39.94 | 0.373 |
| Neon | 0.000018 | 20.18 | 0 |
| Helium | 0.000005 | 4.00 | 0 |
| Krypton | 0.000001 | 83.8 | 0 |
| Xenon | 0.09 10-6 | 131.29 | 0 |
| Total Molecular Mass of Air | 28.97 | ||
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