11. when is a roman numeral necessary when naming a compound?
a. when the nonmetal anion has variable charge
b. when a polyatomic ion is used
c. when the metal cation has variable charge
d. when there is a subscript on the first element

12.which of the following is the correct name for sio2?
a. silicon dioxide
b. silicon oxide
c. silicon (ii) oxide
d. silicon oxate

13.which of the following is the correct name for lihco3?
a lithium monohydrogen carbonate
b lithium bicarbonate
c lithium (i) bicarbonate
d monolithium monohydrogen carbonate

14.which of the following is the correct name for kbr?
a potassium monobromide
b monopotassium monobromide
c potassium bromide
d potassium (i) bromide

15which of the following is the correct name for n2o5?
a nitrogen pentoxide
b nitrogen oxide
d dinitrogen pentoxide
c nitrogen (ii) oxide (v)

16 which of the following is the correct name for i2?
a diiodide
b iodide
c iodine
d iodate

17 which of the following is the correct name for pbf2?
a lead fluoride (ii)
b lead fluoride
c lead difluoride
d lead (ii) fluoride

18 which of the following is the correct name for cu(clo4)2?
a copper (ii) chlorate
b copper dichlorate
c copper chlorate
d copper chlorate (ii)

19. when is a prefix not necessary when naming a compound/molecule?
i. when the compound/molecule contains a metal cation
ii. when the compound/molecule contains only nonmetals and/or metalloids
iii. when there is only one of the first atom in a covalent molecule
a. i only
b. ii only
c. iii only
d. i & ii
e. i & iii
f. ii & iii

20. which of the following is the correct formula for bromine?
. br
a. br2
b. bro3
c. b

21. which of the following is the correct formula for cobalt (iii) oxide?
a. co3o
b. co6o3
c. co3o2
d. co2o3

22. which of the following is the correct formula for magnesium nitrate?
. mgno3
a. mg(no3)2
b. mgno6
c. mg2no3

23. which of the following is the correct formula for boron trichloride?
. bcl3
a. b + 3 cl
b. b3cl
c. 3 bcl

6. which of the following is the correct formula for barium iodide?
. bai2
a. ba7i2
b. bai
c. ba2i

24. which of the following is the correct formula for aluminum bromide?
. al7br3
a. albr3
b. al3br
c. al3br7

8. which of the following is the correct formula for heptaphosphorus decabromide?
. p6br10
a. p7br9
b. p7br10
c. p5br8

25. which of the following elements in not a diatomic element?
. hydrogen
a. carbon
b. chlorine
c. oxygen

26. a word equation:
. describes a chemical reaction using only words
a. describes a chemical reaction using chemical formulas and symbols
b. describes a chemical reaction by reading the states of matter
c. describes a chemical reaction using words and symbols

27. a formula/skeleton equation:
a. describes a chemical reaction using only words
b. describes a chemical reaction using chemical formulas and symbols
c. describes a chemical reaction by reading the states of matter
d. describes a chemical reaction using words and symbols
28. which of the following represents a reversible reaction?
. a + b → c
a. a → b + c
b. a + b → c + d
c. a ⇌ b + c