Hot Water, Cold Water What mixes faster? By Connor Vogel

Materials 2 glasses Hot water Cold water Green food coloring Connor’s eyes

Procedure Fill 1 glass with hot water. Fill 1 glass with cold water. Let water sit until still. Add 1 drop of food coloring to each glass. Observe both glasses to see if our hypothesis is correct.

What is going on? Water is made of molecules (two hydrogen atoms and one oxygen atoms stuck together). Molecules in a liquid have enough energy to move around and pass each other. This is why water can flow and take the shape of the glass we pour it into. Warm water has more energy than cold water, which means that molecules in warm water move faster than molecules in cold water. The food coloring added to the water is pushed around by the water molecules. Since the warm water moves around faster, the food coloring spreads out quicker in the warm water than in the cold water.

Water is made of 1 Oxygen molecule and 2 Hydrogen Molecules

Conclusion The water molecules in the hot water are moving faster than the molecules in the cold water. The food coloring spreads out faster in the hot water than in the cold water. Our hypothesis is correct.

RESOURCES www.galaxy.net/-k12/matter/movemol.shtml www.lessonplanspage.com/printables/PScienceExTempsEffectonSpeed