Which feature of a balanced chemical equation demonstrates the law of conservation of mass?
A. It has equal numbers of each type of atom in its reactants and
products.
OB. It has a reaction arrow between the products and reactants of a
chemical reaction.
OC. It shows the coefficients and subscripts of each formula shown in
the equation.
D. It shows the chemical formula for each substance in its reactants
and products

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