Watch the Video and then try the experiment yourself.
PROBLEM: HOW DOES SALT AFFECT SNOW?
HYPOTHESIS: If we pour salt on snow, it will melt faster than snow that has no salt on it.
I think this way because I have seen people pour salt on the sidewalk after a snowstorm in order to make it easier to remove the snow.
VARIABLES:
Independent Variable: Presence of Salt
Dependent Variable: Time it takes the snow to melt
Constants: Same amount of snow
Same place (windowsill)
Same temperature
Same time of day
MATERIALS:
Rock Salt
Cup
Metric Ruler
Area of snow (window sill)
PROCEDURE:
1. Measure the window sill.
2. Make a mark at the middle of the window sill.
3. sprinkle salt on one side
4. Leave the other side without salt.
5. Observe the time it takes for the snow on each side to melt.
RESULTS:
After 20 minutes the side of the window sill with salt was mostly melted.
The other side was just the same.
CONCLUSION: If you pour salt on one half of a window sill covered with snow and leave the other side without salt, then the side with salt will melt much faster than the side without snow.
QUESTIONS: Why does salt melt snow? Is it because salt warms the snow?
