A. at what ph are about 1/2 of the carboxyl groups ionized? ph = b. where does the amino acid have a net charge of +1? below ph 2.34 at ph = 2.34 at ph = 6.01 at ph = 9.69 above ph 9.69 c. at what point has enough base been added to react with 1/2 of the cooh groups? 1/2 of cooh reacted = equivalents oh− when 1/2 of cooh has reacted, the ph = d. at which ph value does the amino acid have the best buffering capacity? 1.53 10.5 2.34 6.01 3.00 9.00 e. what is the pi (isoelectric point)? pi =

If a straight-chain hydrocarbon is a gas at room temperature, how many carbon atoms will it have? a. 6 carbon atoms b. 12 carbon atoms c. 24 carbon atoms d. 3 carbon atoms

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane

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