Atomic Structure/dimensional analysis
What is the classification of sulfur
-metal
-metalloid
-semiconductor
-nonmetal
nonmetal
What is the correct name for N2O5?
A. nitrogen(II) oxide
B. dinitrogen oxide
C. nitrogen(V) oxide
D. dinitrogen pentoxide
D. dinitrogen pentoxide
How many moles of hydrogen atoms are in six moles of Ca(OH)2
A. 2
B. 6
C. 8
D. 12
D. 12
What are the smallest whole number coefiicients for each substance (respectively) in the chemical equation when balanced?
AgI+Na2S yields Ag2S+NaI
A. 1, 0.5, 0.5, 1
B. 2,1,1,2
C. 2,3,3,2
D. 4,2,2,4
B. 2,1,1,2
Which term best describes the relation of hydrogen (1H) to deuterium (2H)?
-allotropes
-isomers
-iostopes
-polymers
isotopes
What is the formula for hydroiodic acid?
A. HI
B. HIO
C. HIO2
D. HIO3
A. HI
A 4.08 g sample of a compound of nitrogen and oxygen contains 3.02 g of oxygen. What is the empirical fomrula?
A. NO2
B. NO3
C. N3O2
D. N2O5
D. N2O5
What is the mass (in g) of ammonia (NH3) necessary to preoduce 0.340 mol NO in the presence of excess oxygen?
4NH3+5O2 yields 4NO+6H2O
A. 1.45 g
B. 5.21 g
C. 5.79 g
10.2 g
C.5.79
A sodium ion differs from a sodium atom in that the sodium ion
- has fewer electrons
- is and isotope of sodium
-exists only in solution
-has a negative charge on its nucleus
Has fewer electrons
The formula of strontium hexafluorosilicate is SrSiF6. What is the formula of aluminum hexafluorosilicate
A. AlSiF6
B. Al2(SiF6)3
C. Al3SiF6
D. Al3(SiF6)2
B. Al2(SiF6)3
What is the mass percent of oxygen in K2CO3? (molar mass of K2CO3=138.2 g/mol)
A. 11.58%
B. 23.15%
C. 34.73%
D. 69.46%
C. 34.73%
What amount of excess reagent remains when 4.0 g zinc react with 2.0 g phosphorous (P=30.97 g/mol, Zn=65.39 g/mol, Zn3P2=258.1 g/mol)
3Zn+2P yields Zn3P2
A. 0.70 g P
B. 1.3 g P
C. 0.22 g Zn
D. 4.2 g Zn
A. 0.70 g
Which element is an actinide
- Rb
-U
-Mo
-Ga
U
Which is not named correctly?
A. MnO2 manganese(II) oxide
B. CuSO4 copper(II) sulfate
C. Na3PO4 sodium phosphate
D. CaF2 calcium fluoride
A. MnO2 manganese(II) oxide
--What should it be named (100 pts)
A molecular compound is found to consist 30.4% nitrogen and 69.6% oxygen. If the molecule contains 2 atoms of nitrogen, what is the molar mass of the molecule?
A. 46 g/mol
B. 92 g/mol
C. 154 g/mol
D. 168 g/mol
B. 92 g/mol
Which atom has the most neutrons?
A. neon-20
B. phosphorous-32
C. chlorine-35
D. sulfur-35
D. sulfur-35
A sample of a compound of xenon and fluorine contains molecules of a single type; XeFn, where n is whole number. If 9.03x1020 of these XeFn molecules have a mass of 0.311 g, what is the value of n?
A. 2
B. 3
C. 4
D. 6
C. 4