This element is present in chlorophyll.
This element forms a protective oxide coating.
This element is used to improve the conductiv-
ity of germanium.
Which of the following aqueous solutions is blue?
(A) CuSO 4
(B) Cr 2 (SO 4 ) 3
(C) NiSO 4
(D) ZnSO 4
(E) CoSO 4- In order to separate two substances by fractional
crystallization, the two substances must differ in
which of the following?
(A) solubility
(B) specific gravity
(C) vapor pressure
(D) viscosity
(E) freezing point- In a flame test, copper compounds impart which
of the following colors to a flame?
(A) red
(B) orange
(C) blue to green
(D) violet
(E) yellow- What should you do if you spill sulfuric acid on
the countertop?
(A) Neutralize the acid with vinegar.
(B) Sprinkle solid NaOH on the spill.
(C) Neutralize the acid with NaHCO 3 solution.
(D) Neutralize the acid with an Epsom salt
(MgSO 4 ) solution.
(E) Use paper towels to soak up the acid.23. Which of the following can be achieved by using
a visible-light spectrophotometer?I. Detecting the presence of isolated double
bonds.
II. Finding the concentration of a KMnO 4
solution.
III. Running a flame test to determine if Na+or
K+is in a solution.(A ) III only
(B ) II only
(C ) I only
(D) II and III
(E ) I and II24. You are given an aqueous solution of NaCl. The
simplest method for the separation of NaCl
from the solution is(A) evaporation of the solution to dryness
(B) centrifuging the solution
(C) osmosis of the solution
(D) electrolysis of the solution
(E) filtration of the solution25. The determination that atoms have small, dense
nuclei is attributed to(A) Rutherford
(B) Becquerel
(C) Einstein
(D) Dalton
(E) Bohr62 STEP 4. Review the Knowledge You Need to Score High