Activity 1

Does hot water or cold water boil faster?
Hypothesis: I believe that hot water will boil faster than cold water.

Controlled variables: Source of water, temperature of stove, amount of water put in each pot.

Scientific method:
1. Propose a question
2. Do your research
3. Make a hypothesis
4. Perform an experiment
5. Draw a conclusion
6. Report the results

Scientfic method in my experiment:
1. (Question) Does hot water or cold water boil faster?
2. (Research) In looking at the class slides and through the textbook, I know that water boils at 100C and water freezes at 0C. I also know that physical changes occur when a substance isn't changed, just takes on a new form. Two examples from the class slides are melting and freezing.
3. (Hypothesis) I believe that hot water will boil faster than cold water because it starts off as a higher temperature so it has a shorter distance to get to 100C than the cold water will have.
4. (Experiment) In my journey to find out if hot water or cold water boils faster, I first measured two cups of hot water for one pot and two cups of cold water for another pot.

I then put two of my stove burners on setting 5 and put them their respective sides... hot water on the left and cold water on the right.

I set my stopwatch as soon as I put them on the burners and checked in every 30 seconds, which is my quantitative research. I then documented what I saw using descriptions, which is my qualitative observations.

EXPERIMENT #1	Hot Water	Cold Water
1:00	Nothing Happening	Nothing Happening
1:30	Some Heat Rising	Nothing Happening
2:00	More Heat	Nothing Happening
2:30	Boil at 2:35	Nothing Happening
3:00	Boiling	Some Heat Rising
3:30	Boiling	Some Heat Rising
4:00	Boiling	More Heat
4:30	Boiling	More Heat
5:00	Boiling	Boil at 5:25

EXPERIMENT #2	Hot Water	Cold Water
1:00	Nothing Happening	Nothing Happening
1:30	Some Heat Rising	Nothing Happening
2:00	More Heat	Nothing Happening
2:30	Boil at 2:42	Nothing Happening
3:00	Boiling	Some Heat Rising
3:30	Boiling	Some Heat Rising
4:00	Boiling	More Heat
4:30	Boiling	More Heat
5:00	Boiling	Boil at 5:29

5. (Conclusion) Hot water boils faster than cold water.
6. (Results) It took almost 3 minutes longer for cold water to boil than hot water in Experiment #1, and it took about the same time difference in Experiment #2.

Water molecule:

Molecular arrangement in the three states of matter:
According to our class slides, a solid has a definite shape and volume, while a liquid has a definite volume but no definite shape, and a gas doesn't have a definite volume or shape.