Identify the statements that are consistent with the law of conservation of mass. a. New elements are produced using chemical reactions.
b. All samples of a given chemical compound consist of the same elements in the same proportion.
c. In a chemical reaction, the atoms of the reactants rearrange to form new compounds.
d. Chemical reactions neither create nor destroy mass in an isolated system.
e. The mass of the products in a chemical reaction are typically greater than the mass of the reactants.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative