A physical therapist assistant conducts an inservice on exer…

A physical therapist assistant conducts an inservice on exercise guidelines for a group of senior citizens. As part of the inservice the physical therapist assistant discusses the benefits of improving cardiovascular status through a low intensity activity such as a walking program. What frequency of exercise would be the MOST desirable to achieve the stated objective?

Consider the acid ionization reaction of carbonic acid (H2CO…

Consider the acid ionization reaction of carbonic acid (H2CO3), which has a Ka of 3.98 × 10─7 H2CO3(aq) + H2O(l) ⇌ HCO3−(aq) + H3O+(aq) Which of the following will decrease the pH of the resulting solution? I. Addition of HCO3− II. Addition of H2CO3 III. Removal of HCO3−  

A chemical engineer is studying the following reaction: CH4(…

A chemical engineer is studying the following reaction: CH4(g) + 2H2S(g) → CS2(g) + 4H2(g) At the temperature the engineer picks, the equilibrium constant, Kp, for this reaction is 31. The engineer fills the reaction vessel with methane and hydrogen sulfide, and lets the reaction begin. He then measures the composition of the mixture inside each vessel from time to time. His first set of measurements show that there are 9.59 atm CH4, 6.70 atm H2S, 7.54 atm CS2, and 8.52 atm H2. Predict the changes in the compositions the engineer should expect next time he measures the compositions. Select all that apply.

The equilibrium constant, Kc, for the reaction PCl3(g) + Cl2…

The equilibrium constant, Kc, for the reaction PCl3(g) + Cl2(g) ⇌ PCl5 (g) is 49 at 230 ˚C. If 0.70 mol of PCl3 is added to 0.70 mol of Cl2 in a 1.00-L reaction vessel at 230 ˚C, what is the concentration, in mol/L, of PCl3 when equilibrium has been established? Enter a number, to 3 significant figures, and without units.