1. Assume that the top of your head has a surface area of 25cm x 25 cm. How many newtons of force push on your head at sea level? 2. if you estimate this area to be 100 in^2 what is the force in pounds.

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

What are the similarities of physical and chemical change ?