When soap molecules are dissolved in water in a pool, the soap molecules migrate to the surface of the water and actually coat the surface, with the polar heads being dissolved in the water and the non-polar tails sticking out into the air above the surface of the water.

What is the independent variable in this investigation? mass volume sample number substance density

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What is the mass of phosphorous in a 51-kg person