During an experiment water was heated in a container covered with a glass lid. the following observations were recorded.
observation 1: water droplets form on the inside of the glass lid.
observation 2: bubbles rise as the water starts boiling. based on the observation, justify the type of change (physical or chemical) that took place.

If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

Wind and moving water provide energy. chemical mechanical thermal none of the above

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy