Simplify   . Assume the denominator is not equal zero.

If 25 mL of 0.750 M HCl are added to 100. mL of 0.392 M NaOH, what is the final pH? a. 13.21 b. 2.79 c. 13.50 d. 1.50 e. 11.25

Consider the reaction A(aq) ⇌ 2 B(aq) where Kc = 4.1 at 25 °C. If 0.50 M A(aq) and 1.5 M B(aq) are initially present in a 1.0 L flask at 25 °C, what change in concentrations (if any) will occur in time? a. will decrease and will decrease. b. will decrease and will increase. c. will increase and will decrease. d. will increase and will increase. e. and remain unchanged.

For the reaction given below, 1.00 moles of A and 3.00 moles of B are placed in a 6.00-L container.           A(g) + 2B(g)  ⇌ C(g) At equilibrium, the concentration of A is 0.123 mol/L. What is the value of Kc? a. 1.41 b. 2.08 c. 6.34 d. 0.223 e. 0.495

Consider the Ka values for the following acids: Cyanic acid, HOCN, 3.5 x 10–4 Formic acid, HCHO2, 1.7 x 10–4 Lactic acid, HC3H5O3, 1.3 x 10–4 Propionic acid, HC3H5O2, 1.3 x 10–5 Benzoic acid, HC7H5O2, 6.3 x 10–5 Which has the strongest conjugate base? a. HOCN b. HCHO2 c. HC3H5O3 d. HC3H5O2 e. HC7H5O2

Which of the following conditions is/are met at the equivalence point of the titration of a weak base with a strong acid?   1. The moles of acid added from the buret equals the initial moles of weak base.   2. The volume of acid added from the buret must equal the volume of base titrated.   3. The pH of the solution is less than 7.00.   a. 1 only b. 2 only c. 3 only d. 1 and 3 e. 2 and 3

The thermochemical equation for the formation of ammonia from elemental nitrogen and hydrogen is as follows.   N2(g) + 3 H2(g) ⇌ 2 NH3(g) Delta H = –92.2 kJ Given a system that is initially at equilibrium, which of the following actions cause the reaction to proceed to the left? a. adding N2(g) b. removing NH3(g) c. adding a catalyst d. decreasing the temperature e. removing H2(g)

Solve the equation    . Assume that the denominator is nonzero.

Which initiative was part of Lyndon Johnson’s War on Poverty and aimed at early childhood education?

Which 1973 Supreme Court decision recognized a woman’s legal right to have an abortion?