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?

A physical therapist assistant instructs a patient in a home stretching program that includes the pictured stretch. The MOST likely structure targeted is the:

Consider the following gas phase reaction: A(g) + B(g) ⇌ 2C(g)    Kp = 36 If initially 2.0 atm of A and 2.0 atm of B are placed in a chamber and then the reaction is allowed to proceed, calculate the equilibrium partial pressure of C.

Nitrogen and hydrogen react to form ammonia: N2(g) + 3H2(g) → 2NH3(g)A chemist finds that at a certain temperature the equilibrium mixture of nitrogen, hydrogen, and ammonia has the following composition: Compound Pressure at equilibrium N2 2.19 atm H2 78.5 atm NH3 18.9 atm Calculate the value of the equilibrium constant, Kp for this reaction. 

The equilibrium constant, Kp, has a value of 6.50 × 10−4 at 308 K for the reaction of nitrogen monoxide with chlorine: 2 NO(g) + Cl2(g) ⇌ 2 NOCl(g) What is the value of Kc?

Express the equilibrium constant expression for the following reaction:                  4 Al(s) + 3 O2(g)   ⇌  2 Al2O3(s)  

Nitrous acid, HNO2, is a weak acid in water (pKa = 3.35). If an aqueous solution of nitrous acid with pH 2.69 is required, what concentration, in M, of the acid is needed? Enter your numerical answer to 4 decimal places and without units.

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(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.

Phosphoric acid has Ka1 = 7.1 × 10−3; Ka2 = 6.3 × 10−8; Ka3 = 4.2 × 10−13 . For a 3.0 M H3PO4 solution, the [PO4−3] is closest to