METHOD FOR EXPERIMENT

WHAT MAKES ICE MELT FASTEST.

Hypothesis: Certain substances will make ice melt faster than others

Aim: to determine which substance make ice melt fastest

Equipment: ice cubes, kitchen scales, cup, plates, teaspoon, sand, salt, sugar, pepper, stopwatch

Method:

1. weigh mass of cup
   
2. Weigh mass of initial ice cube
   
3. Set up equipment
4. start stopwatch and add one table spoon of salt to the ice cube
5. Stop stopwatch at 10 minutes
6. weigh new mass of ice cube
7. collect water in plate and pour into cup, weigh the water int he cup and deduct eh mass of cup from this mass
8. record results
9. repeat steps 2-8 3 times with salt
10. repeat whole experiment with other substances (sugar, pepper, sand)

xxxmel

took me so long to do this

excuse my bad photoshopping :S

additional research

Salt water is an example of a chemical solution. In a solution, there is a solvent (the water in this example), and a solute (the salt in this example). A molecule of the solute will dissolve (go into solution) when the force of attraction between solute molecule and the solvent molecules is greater than the force of attraction between the molecules of the solute. Water (H₂O) is a good solvent because it is partially polarized. The hydrogen ends of the water molecule have a partial positive charge, and the oxygen end of the molecule has a partial negative charge. This is because the oxygen atom holds on more tightly to the electrons it shares with the hydrogen atoms. The partial charges make it possible for water molecules to arrange themselves around charged atoms (ions) in solution, like the sodium (Na₊) and chloride (Cl⁻) ions that dissociate when table salt dissolves in water. Other substances that dissolve in water also lower the freezing point of the solution. The amount by which the freezing point is lowered depends only on the number of molecules dissolved, not on their chemical nature. This is an example of a colligative property.--- i don't understand that. someone tell me? it doesn't make sense :S

And also, I change my last post:

the independent variables are
soluble substances : salt, sugar
insoluble substances: pepper, sand

What Makes Ice Melt Fastest?

this is what i have decided to do my experiment on.
I will do this experiment by adding substances (pepper, salt, sugar, sand, nothing added) to ice cubes and determine which one melts the fastest. This experiment will be repeated 3 times for each substance.

independent variables:
the substances i.e. salt, pepper, sugar, sand, compared to when nothing is added

dependent variables:
percentage of the ice cube remaining
percentage of the ice cube that melted

controlled variables:
same size ice cube (volume)
same water, tap
time in which the ice melts (10 minutes)
same place for each experiment
same amount of the substance added (1 teaspoon)
use same scales to measure

http://www.scienceteacherprogram.org/envsci/nanes02.html

http://www.juliantrubin.com/fairprojects/environment/waterpollution.html

http://www.juliantrubin.com/fairprojects/environment/waterquality.html
the one i'm thinking about is investigating the differences between rain, tap, filtered, and bottled.

Identify which, if any, inorganic nutrient can be added to the environment of naturally occurring petrophilic (oil-degrading) microbes (namely a fungal strain, Penicillium; and a bacterial strain, Pseudomonas) in order to induce an increase in the rate at which oil spills in the ocean can be efficiently cleaned up. (scroll down to "high school") http://www.usc.edu/CSSF/History/2008/Projects/S0907.pdf is the link to the real experiment

The Effects of Oil Spills on Underwater Plant Life

---

How could be human hair used in absorbing oil spills

---

Cleaning up an oil spill http://www.usc.edu/CSSF/History/2005/Projects/S1419.pdf


but the ones i've linked are the ones i'm actually interested in. AND DOES BACTERIA COUNT AS "ANIMALS"?????

I WILL FINISH THIS BY TONIGHT

the one's i've found seem too easy.

http://www.scienceteacherprogram.org/envsci/nanes02.html

DECIDED

... that i want to do something using water.

http://www.homeschooling-ideas.com/water-experiments.html

idea?

http://www.srpnet.com/education/experiments/betterbaker.aspx

possible.

HEY THERE WORLD.

xx mel