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Review, Sig Figs, and Sci Notation

Total questions: 45

Worksheet time: 2hrs 36mins

Name
Class
Date
1.
How many significant figures does 0.025 kg have?
a)
1
b)
2
c)
3
d)
4
2.
Which value has only 4 significant digits? 
a)
6.930
b)
0.450
c)
8450
d)
0.392
3.
Convert to scientific notation 305,000
a)
3.0500
b)
3.0500 x 105
c)
3.05 x 105
d)
3.05 x 102
4.
Convert the following to scientific notation. 
0.000480
a)
4.80 x 104
b)
4.80 x 10-4
c)
4.8 x 10-3
d)
4.8 x 10-4
5.
How would you write the number 5,765,780 with 3 sig figs?
a)
576
b)
577
c)
5,760,000
d)
5,770,000
6.
How many sig figs are in the red number?
4.00 x 108 mm
a)
1
b)
3
c)
9
d)
infinite
7.
How would you write 4.3756 x 104 in standard form?
a)
437,560,000
b)
0.00043756
c)
43,756
d)
44,000
8.
Multiply:
(3.4 x 105)(1.2 x 10-3)
a)
408
b)
400
c)
410
d)
4.08 x 100
9.
Calculate
12.3 × 1.234 × 0.12
a)
1.82
b)
1.8
c)
2.0
d)
1.821
10.
Subtract these numbers and show the correct number of significant figures
606.09 - 7.004
a)
599.086
b)
599.08
c)
599.1
d)
599.09
11.
Divide these numbers and show the correct number of significant figures
0.04263 
÷
0.306
a)
0.139
b)
0.1393
c)
0.13931
d)
0.14
12.
Balance this equation:  H2 + N2 → NH3
a)
 H2 + 4N2 → NH3
b)
 H2 + 3N2 → 2NH3
c)
 3H2 + N2 → 2NH3
d)
 2H2 + 2N2 → 2NH3
13.
Balance this equation,            Al2O3 ---> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2 
c)
2Al2O3 ---> 4Al + 3O2 
d)
3Al2O3 ---> 2Al + O2 
14.
_BaS + _PtF2 → _BaF2 + _PtS
a)

BaS + PtF2 → BaF2 + PtS

b)

4 BaS + 2 PtF2 → BaF2 +  PtS

c)

BaS + 2 PtF2→ 2 BaF2 +  2 PtS

d)

BaS + 3 PtF2 → BaF2 +  2 PtS

15.
_Al + _HCl →_H2 + _AlCl3
a)
2 Al + 2 HCl → 2 H2 + 6 AlCl3
b)
3 Al + 3 HCl → 6 H2 + 2 AlCl3
c)

Al + HCl → 3 H2 + AlCl3

d)
2 Al + 6 HCl → 3 H2 + 2 AlCl3
16.
_K + _Cl2 →_KCl
a)
2 K + 16 Cl2 → 8 KCl
b)

2 K + Cl2 → 2 KCl

c)
3 K + 4 Cl2 → 3 KCl
d)

K + Cl2 →KCl

17.
_AlBr3 + _K2SO4 → _KBr + _Al2(SO4)3
a)

6 AlBr3 + K2SO4 → 6 KBr + Al2(SO4)3

b)

2 AlBr3 + 3 K2SO4 → 6 KBr + Al2(SO4)3

c)

AlBr3 + K2SO4 → 2 KBr + 3 Al2(SO4)3

d)

2 AlBr3 + 3 K2SO4 → KBr + 2 Al2(SO4)3

18.
_SO2 + _Li2Se →_SSe2 + _Li2O
a)

SO2 + 2 Li2Se → SSe2 + 2 Li2O

b)

SO2 + Li2Se → 2 SSe2 + 2 Li2O

c)
2 SO2 + 2 Li2Se → 2 SSe2 +  2 Li2O
d)

2 SO2 + 2 Li2Se → SSe2 + Li2O

19.
_NaF + _Br2 →_NaBr + _F2
a)

NaF + 2 Br2 →NaBr + 2 F2

b)
2NaF + 2 Br2 → 2 NaBr + 2 F2
c)

2 NaF + 3 Br2 → NaBr + 2 F2

d)

2 NaF + Br2 → 2 NaBr + F2

20.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
21.

Balance the following:

When sodium and chlorine are combined, sodium chloride is produced

a)

blank,blank,2

b)

2,blank,2

c)

2,blank,blank

d)
already balanced
22.

Balance the following:

Dihydrogen dioxide decomposes to produce water and oxygen gas

a)
already balanced
b)

2,blank,blank

c)

2,2,blank

d)

2,blank,2

23.

Balance the following:

Sodium chlorate breaks down to form sodium chloride and oxygen gas

a)
2,2,2
b)
2,2,3
c)
3,2,2
d)

blank,2,3

24.

Balance the following:

Ammonium phosphate and lead (IV) nitrate react to produce lead (IV) phosphate and ammonium nitrate

a)

2,blank,blank,6

b)

blank,2,2,3

c)

4,3,blank,12

d)

4,2,blank,12

25.

Balance the following:

When boron fluoride combines with lithium sulfite, boron sulfite and lithium fluoride are produced.

a)

2,3,blank,3

b)

2,3,blank,6

c)
4,4,2,12
d)

3,3,blank,9

26.
_AgNO3 + _Cu →_Cu(NO3)2 + _Ag
a)

2 AgNO3 + 2 Cu → 3 Cu(NO3)2 + Ag

b)

2 AgNO3 + Cu → Cu(NO3)2 + 2 Ag

c)

AgNO3 + 2 Cu → 2 Cu(NO3)2 + Ag

d)
3 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 2 Ag
27.
What is sodium carbonate?
a)
Ionic
b)
Covalent
c)
Acid
28.
What is the formula for sodium carbonate?
a)
Na2CO3
b)
NaCO3
c)
SCO3
d)
S2CO3
29.
What is acetic acid?
a)
Ionic
b)
Covalent
c)
Acid
30.
What is the formula for acetic acid?
a)
C2H4O2
b)
HAs
c)
HC2H3O2
d)
H3As
31.
What is trinitrogen hexoxide?
a)
Ionic
b)
Covalent
c)
Acid
32.
What is the formula for trinitrogen hexoxide?
a)
NO
b)
N3O6
c)
N3O8
d)
N3O7
33.
What is silver bromide?
a)
Ionic
b)
Covalent
c)
Acid
34.
What is the formula for silver bromide?
a)
AgBr
b)
AgBr2
c)
AgBr3
d)
Cannot be done, no charge for silver given
35.
What is copper (III) sulfide?
a)
Ionic
b)
Covalent
c)
Acid
36.
What is the formula for copper (III) sulfide?
a)
Cu2S3
b)
CuS3
c)
Cu3S2
d)
Cu2S
37.
What is hydroiodic acid?
a)
Ionic
b)
Covalent
c)
Acid
38.
What is the formula for hydroiodic acid?
a)
H3I
b)
H2I
c)
HI
d)
HI2
39.
How many significant figures does the following number have: 0.998005
a)
9
b)
10
c)
6
d)
5
40.
How many significant figures does the following number have: 0.002040
a)
6
b)
4
c)
3
d)
2
41.
Round 1047.78 to three sig figs
a)
104
b)
105
c)
1050
d)
1050.00
42.

Solve. Round using SigFig math rules.

12.5 + 20.05 + 2.69

a)

35

b)

35.2

c)

35.24

d)

35.240

43.
How many significant figures will be in the answer to the following question:
7.62 x 6.98 x 3.2645
a)
1
b)
2
c)
3
d)
4
44.
Express the following in scientific notation:
10,030,400,000
a)
1.00304 x 109
b)
1.00304 x 1010
c)
1.00403 x 1010
d)
1.00304 x10-10
45.
Which of the following is correct scientific notation?
a)
20.35 x 104
b)
.2035 x 104
c)
2035 4
d)
2.035 x104

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