Fostering Friendships - Enhancing Social Bonds in the Classroom
Biology density
1.
2. BW (Bell Work): Why does ice float in water? The Density of water is 1g/cm 3 . An object will float is the density is less than 1. An object will sink if its density is greater than 1.
3. Description : A fish tank, Coke and Diet Coke are supplied. The Coke sinks while the Diet Coke floats.
4.
5.
6.
7. What would take up more space??? A kilogram of feathers….. or a kilogram of steel? OR
8.
9.
10.
11. Density Large ball – 0.53 g/cm 3 Medium ball – 1.05 g/cm 3 Small ball – 0.82 g/cm 3
12. The “bounceability” of a ball depends on its density, not on its mass or on how big the ball is.
13. Have you wondered why hot air balloons rise? When the air is heated, it becomes less dense until the balloon's total density is less than that of the atmosphere; A hot air balloon is literally floating on the denser, colder air.
14. Do you know why volcanoes erupt? The main reason that magma rises to the surface to erupt at volcanoes is because it is less dense than the rocks that surround it.
15. A ship floating on water is a great illustration of the difference between mass and density. A ship must have a density of less than 1.0 g/cm 3 (the density of water), or it will sink. Ships have a large mass, because they are made of steel, but because they have a large volume, their density is less than 1.0 g/cm 3 . If enough mass is added to them such that their density goes above 1.0 g/cm 3 , they will sink.
16. You have a rock with a volume of 15cm 3 and a mass of 45 g. What is its density? D = m/v (g/cm 3 )
17. What is the mass of a 350 cm 3 sample of pure silicon with a density of 2.336 g/cm 3 ? Mass = density x volume x Mass = 2.336 g/cm 3 x 350 cm 3 Mass = 818 grams D = m/v (g/cm 3 ) m=d x v v=m/d http://serc.carleton.edu/mathyouneed/densitysp.html
18. Solving For Mass Original Formula Multiply both sides by v The "v's" cancel out Isolate for mass m = v x D
19. solving For Volume Original Formula Multiply both sides by volume m = v x D Divide both sides by density Adjusted formula
27. The densities for some common substances are: Substance Density (gm/cu.cm) Air 0.0013 Wood (oak) 0.85 Water 1.00 Ice 0.93 Aluminum 2.7 Lead 11.3 Gold 19.3 Ethanol 0.94 Methanol 0.79
50. Look at the graduated cylinder. It contains the following liquids. Label the liquids in the graduated cylinder based on the data below. (4 A . B . C D . Liquid Density (g/ml) corn syrup 1.38 ether 1.2 canola oil .93 salt water 1.1
51.
52.
Hinweis der Redaktion
ROCKS - pass around
Hot air balloon - Describe how a hot air balloon works. Defend your argument.
Sinking vial - make it float
Beans/ping pong ball; Big jug of water in a pool
Add several drops of red food color to each of two 250-mL Erlenmeyer flasks; fill them with warm tap water. (If tap water is not warm, heat some tap water on a hot plate to 40-45 °C.) Add several drops of blue food coloring to each of the other two 250-mL Erlenmeyer flasks; fill them with cool tap water. Predict the outcome when one flask is inverted over the other. Place a paper card on top of the vessel filled with warm water. Invert the flask making sure to hold the card in place. Stack it on top of one of the cool water flasks. Remove the card. Remain prepared to catch the flasks. ** Visual here. Place a paper card on top of the flask filled with cool water. Invert the flask making sure to hold the card in place. Stack it on top of the other warm water flask. Remove the card. ** Visual here. Wide mouth containers may also be used.
Air bladder when pulled up to quickly
250 b.c., the Greek mathematician Archimedes - story
![[object Object]](https://image.slidesharecdn.com/biologydensitynew2-110514124802-phpapp01/85/Biology-density-1-320.jpg)
