Answers to some of the questions on study guide
ii. Practice problems
EXPRESS EACH OF THE FOLLOWING NUMBERS IN SCIENTIFIC NOTATION
A) 230= 2.30 X 102
B) 5601- 5.601 X 103
C) 141000000= 1.4 X 107
D) 56 MILLION= 5.6 X 107
E) 2/10=0.2= 2 X 10-1
F) 0.45013= 4.5013 X 10-1
G) 0.089= 8.9 X 10-2
H) 0.00026= 2.6 X 10-4
I) 0.000000698= 6.98 X 10-7
Perform the following operations and express the answers in scientific notation (answers only)
a) 5.47 x 106
b) 3.091 x 103
c) 8.051 x 1012
d) 2.29 x 101
Significant Figures (answers only)
1) 4
2) 2
3) 2
4) 4
5) 5
6) 8
7) 3
8) 2
9) 2
10) 4
11) 2
12) 6
13) 2
14) 1
15) 6
16) 1
17) 3
18) 3
19) 4
20) 2
Solve the following mathematical problems such the answers have the correct number of significant
figures (answers only
1) 533 g
2) 35.2 grams
3) 6.21 x 10-2 m2
4) o.11 m2
5) 450 cm
6) 564 m
7) 332.12 kg
8) 2.6 x 103 s2
Electron Configuration (answers only)
1) 1s2 2s2 2p6 3s1
2) 1s2 2s2 2p6 3s2 3p6 4s2 3d6
3) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
4) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2
5) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f5
In the space below, write the abbreviated electron configurations of the following elements: (answers)
6) [Ar] 4s2 3d7
7) [Kr] 5s2 4d9
8) [Kr] 5p4
9) [Rn] 7s2
10) [Rn] 5f14 6d1
Determine what elements are denoted by the following electron configurations:(answers)
11)16S
12) 37 Rb
13) 51Sb
14) 76 Os
15) 99 Es
Determine which of the following electron configurations are not valid: (answers)
16) not valid because after 4s2, 3d10 is next instead of 4d10
17) not valid because after 3s2 comes 3p
18) Ra is not a noble gas
19) valid because it is the abbreviated configuration for 53I
20) not valid because a noble gas can not be an abbreviated version of itself
Name the following ionic compounds(answers)
1) ammonium chloride
2) iron (III) nitrate
3) titanium (III) bromide
4) copper (I) phosphide
5) Tin (II) selenide
6) gallium arsenide
7) lead (II) sulfate
8) beryllium bicarbonate
9) manganese (III) sulfite
Write the formulas for the following compounds (answers)
11) Cr3(PO4)6
12) V2(CO3)4
13) Sn(NO2)2
14) Co2O3
15) Ti(CH3CO2)2
16) V2S5
17) Cr(OH)3
18) LiO
19) Pb(NO2)2
Write the names of the following chemical compounds (answers)
1) boron bromide
2) calcium sulfate
3) dicarbon hexabromide
4) chromium (III) carbonate
5) silver phosphide
6) iodine oxide
7) vanadium oxide
8) lead (II) sulfide
9) carbon tetrahydride or methane
10) dinitrogen trioxide
Write the formulas of the following chemical formulas (answers)
11) P4Se3
12) K(CH3CO2)
13) Fe3P2
14) Si2Br6
15) Ti2(NO3)4 or Ti (NO3)2
16) Se2I2
17) Cu3(PO4)
18) Ga2O3
19) S4N2
20) P
Name the following acids and bases:(Answers)
1) sodium hydroxide
2) sulfurous acid
3) hydrogen sulfide
4) phosphoric acid
5) ammonia
6) hydrogen cyanide
7) calcium hydroxide
8) iron (III) hydroxide
9) hydrophosphic acid
Write the formulas of the following acids and bases (answers)
10) HF
11)H2Se
12) H2CO3
13) LiOH
14) HNO2
15) Co(OH)2
16) H2SO4
17) BeOH
18) HBr