SAT Subject Test Chemistry,10 edition

(A) 0.0142  moles

(B) 0.0974  moles

(C) 0.112   moles

(D) 0.256   moles

(E) 1.85    moles

65 . Which of the following would be the best next step in the procedure?

(A) Add additional  BaCl 2  hydrate to  the crucible.

(B) Add distilled   water   to  the crucible.

Heat    the crucible    and contents    for an  additional  10  minutes and measure the mass

again.

(C)

(D) Determine   the melting point   of  the product.

(E) No  additional  steps   are necessary.

66 . For each pair of chemicals below, the amounts shown are dissolved, together, in water to
make 1.0 L of solution. Which mixture will form a buffer solution?

(A) 0.2 mol of  HCl and 0.1 mol of  K 2 SO 3

(B) 0.2 mol of  NaOH    and 0.4 mol of  HF

(C) 0.1 mol of  HBr and 0.1 mol of  Ba(OH) 2

(D) 0.4 mol of  HCl and 0.2 mol of  NH 3

(E) 0.2 mol of  NaOH    and 0.4 mol of  HCl

67 . What would be appropriate units for the rate constant of a second-order reaction?

(A) s−1

(B) mol L−1

(C) mol L−1 s−1

(D) L   mol−1 s−1

(E) mol^2 L−2   s−2