Based on the law of conservation of mass, if approximately 20g of water reacts in the following equation, producing about 15g of oxygen, what mass of hydrogen (H2) was produced in this reaction?
2H20
2H2 + O2

Can you think of a way a rock unit with an older fossil could be above a rock until with a younger fossil? describe the scenario.

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

If a balloon is taken outside on a very cold day, what will occur?