Activity 1 Continued

Scientific Method/Process

Observation reported

Observation confirmed by others

Hypothesis suggested

Experiments designed to test hypothesis

Experiments do not support hypothesis

Hypothesis rejected

New hypothesis offered- my main hypothesis was reported before experiment

New experiments tried- the experiments were tried

Experiments support (new) hypothesis- the experiment outcome matched the hypothesis

Experiments repeated and results confirmed- the experiment was repeated to see if it followed the same pattern

Theory formulated- the theory was formulated from the two experiments

Theory

1. 1. Does hot water or cold water freeze faster?

My theory is that the hot water freezes slower than the cold but catches up in the end and freezes at about the same time as the cold water.

2. Does hot water or cold water boil faster?

My theory is that hot water boils a minute faster than the cold water.

      

3. Does salt water freeze faster or slower than regular water?

My theory is that the regular water froze faster by 30 minutes compared to the salt water.

       

Animation of water molecules in the three states of matter.

Solid      Liquid     Gas

Image of the atoms that make up water molecules

H2O Hydrogen and Oxygen

Hydrogen Atom

Oxygen Atom

My controlled variables for the experiments:
1. Does hot water or cold water freeze faster?
       Quantity of water for each: 1/4 cup of hot(212 degrees F) and 1/4 cup of cold(42 degrees F) water.
       Temperature of the freezer.
       Temperature of water before freezing hot 212 degrees F, cold 42 degrees F.
       Size of container each water was frozen in same material and size.
2. Does hot water or cold water boil faster?
       Quantity of water for each: 2 cups of hot(120 degrees F) water and 2 cups of cold(42 degrees F) water.
       Size and material of pot the same.
       Same stove used to boil water.
       Temperature before boiling hot 120 degrees F, cold 42 degrees F.
3. Does salt water freeze faster or slower than regular water?
       Temperature of water both 68 degrees F
       Amount of salt in one dish one tsp. 
       Size and material of container water is frozen in.
       Quantity of water for each: 1/4 cup each

Activity 1

Graph of Boils Faster Data

Graph of Freeze Faster Data

Experiment Repeated

When the experiment was repeated the results were about the same the only difference was the time that it froze or boiled, I think because it was a hotter day out than the first one so it took longer for all to freeze.

Experimental Materials and Setup

My Hypothesis for the experimental questions:
1. Does hot water or cold water freeze faster?
         Cold water will freeze faster.
2. Does hot water or cold water boil faster?
         Hot water will boil faster.
3. Does salt water freeze faster or slower than regular water?
         Salt water will freeze slower than regular water.