SAT Subject Test Chemistry,10 edition

27 . Which atom has an ionic radius that is larger than its atomic radius?

(A) Na

(B) K

(C) Mg

(D) Ca

(E) Cl

28 . The basic structure of crystalline substances is called

(A) unit    cell

(B) molecule

(C) lattice

(D) geode

(E) matrix

29 . The oxidation state of nitrogen is most negative in which of the following compounds?

(A) N 2

(B) N 2 O

(C) NH 3

(D) NO 2

(E) NO 3

30 . An insulated tube with a movable piston at one end had 500 J of heat added to it. If,
during the experiment, the piston moves and does 75 J of work on the atmosphere, what
is the change in energy of the tube system?

(A) 575 J

(B) 500 J

(C) 425 J

(D) –75 J

(E) –425    J