
1 
2001 in scientific notation is: 



2.001x10^{2} 



2.001x10^{3} 



20.01x10^{2} 



2001 



None of the previous answers. 

2 
0.00345 in scientific notation is: 



3.45x10^{3} 



3.45x10^{2} 



3.45x10^{3} 



3.45x10^{5} 



None of the previous answers. 

3 
23.0 in scientific notation is: 



2.3x10^{1} 



0.230x10^{2} 



23.0 



2.300x10^{1} 



None of the previous answers. 

4 
97300 in scienfific notation is: 



9.730x10^{4} 



9.7300x10^{4} 



9.73x10^{3} 



9.73x10^{4} 



None of the previous answers. 

5 
0.005050 in scientific notation is: 



5.05x10^{3} 



5.050x10^{2} 



5.050x10^{3} 



5.050x10^{3} 



None of the previous answers. 

6 
400.00 in scientific notation is: 



4.00x10^{2} 



4x10^{2} 



4.0000x10^{4} 



4.0000x10^{2} 



None of the previous answers. 

7 
Express 2100.0 in 3 significant
figures: 



2.10x10^{3} 



2.1x10^{3} 



2100 



2.100x10^{3} 



None of the previous answers. 

8 
Express 3.14159 in 4 significant
figures: 



3.141 



3.142 



3.1416 



3.14 



None of the previous answers. 

9 
Express 0.06406 in 3 significant
figures: 



0.0640 



0.064 



0.06 



6.40x10^{2} 



None of the previous answers. 

10 
Express 20.4 in 2 significant
figures: 



20 



2.0x10^{1} 



2.1x10^{1} 



21 



None of the previous answers. 

11 
How many significant figures are in
the number 303.0 



1 



2 



3 



4 



None of the previous answers. 

12 
How many significant figures are in
the number 2.4560x10^{2} 



2 



3 



4 



5 



None of the previous answers. 

13 
How many significant figures are in
the number 0.0765 



2 



3 



4 



5 



None of the previous answers. 

14 
How many significant figures are in
the number 2000 



1 



2 



3 



4 



None of the previous answers. 

15 
How many significant figures are in
the number 0.9870 



2 



3 



4 



5 



None of the previous answers. 

16 
How many significant figures should
be expressed in the answer to the following:
144/12 = 



1 



2 



3 



5 



None of the previous answers. 

17 
How many significant figures should
be expressed in the answer to the following:
720/900 = 



1 



2 



3 



6 



None of the previous answers.. 

18 
How many significant figures should
be expressed in the answer to the following:
(2.30x10^{4})(1.11x10^{5}) = 



2 



3 



4 



5 



None of the previous answers. 

19 
How many significant figures should
be expressed in the answer to the following:
37.2  36.6 = 



1 



2 



3 



4 



None of the previous answers. 

20 
How many significant figures should
be expressed in the answer to the following:
2.333x10^{3} + 1.1x10^{2} = 



1 



2 



3 



4 



None of the previous answers. 

21 
How many significant figures should
be expressed in the answer to the following:
(2.00)(3.00) = 



1 



2 



3 



6 



None of the previous answers. 

22 
Select the best answer to the
calculation:
48.0/6.0 



8.00 



8.0 



8 



8.000 



None of the previous answers. 

23 
Select the best answer to the
calculation:
(1.11x10^{3})(3.0x10^{2}) = 



3.33x10^{5} 



3.3x10^{6} 



3.33x10^{6} 



3.3x10^{5} 



None of the previous answers. 

24 
Select the best answer to the
calculation:
(5.00x10^{4})(4.0x10^{2}) = 



2.00x10^{2} 



2.0x10^{2} 



2.00x10^{1} 



2.0x10^{8} 



None of the previous answers. 

25 
Select the best answer to the
calculation:
(3.33x10^{5})(2.000x10^{2}) = 



6.66x10^{10} 



6.66x10^{7} 



6.660x10^{7} 



6.66x10^{10} 



None of the previous answers 

26 
Select the best answer to the
calculation:
(5.6x10^{6})/(7.00x10^{2}) = 



8.0x10^{4} 



8.0x10^{3/sup>} 



8.0x10^{5} 



8.00x10^{5} 



None of the previous answers. 

27 
Select the best answer to the
calculation:
(3.6x10^{3})/(9.0x10^{6}) = 



4.0x10^{2} 



4.0x10^{3} 



4.0x10^{18} 



4.0x10^{10} 



None of the previous answers. 

28 
Select the best answer to the
calculation:
5.55x10^{3} + 1.7x10^{1} = 



7.25x10^{3} 



5.57x10^{3} 



5.56x10^{3} 



7.25x10^{4} 



None of the previous answers. 

29 
Select the best answer to the
calculation:
(27.6  25.1)(3.000) 



7.50 



7.500 



7.5 



8 



None of the previous answers. 

30 
Select the best answer to the
calculation:
(12)/(6.022x10^{23}) = 



2.0x10^{22} 



2.0x10^{23} 



2.0x10^{22} 



2.0x10^{23} 



None of the previous answers. 

31 
The density of ethanol at 20^{o}C
is 0.7893 g/mL. Of the two sets of density measurements, which set is more precise? A)
0.790, 0.788, 0.789
B) 0.7890, 0.7888, 0.7887 



A 



B 



A and B have the same precision. 



None of the previous answers. 





32 
The density of water at 20^{o}C
is 0.9982 g/mL. Of the two sets of density measurements, which set is more accurate? A)
0.9989, 0.9993, 0.9991
B) 0.9981, 0.9980, 0.9982 



A 



B 



A and B have the same precision. 



None of the previous answers. 





33 
The number of molecules in a mole is
6.022x10^{23} (Avogadro's number). What is the percent error of a value determined
as 5.90x10^{23} ? 



2.03% 



12% 



2.0% 



None of the previous answers. 





34 
A saturated aqueous solution of
sodium chloride contains 26.4% salt. What is the percent error of a measurement of 25.8% 



0.6% 



2% 



2.27% 



2.3% 



None of the previous answers. 

35 
For the answers to questions 35 
38, click on the world wide web site:
http://maple.lemoyne.edu/~giunta/rayleigh.html.
The paper at this site was written by Lord Rayleigh. Lord Rayleigh and William Ramsay
determined the mass of nitrogen gas generated by chemical means and compared it to the
mass of air from which they had chemically removed the oxygen in the same sized container.
As it was presumed at that time that air consisted of only nitrogen and oxygen, they
expected the mass of the "nitrogen" obtained from the two sources to be the
same. From the site above, calculate the average values of the atmospheric and chemical
nitrogen to 3 significant figures. 



2.32, 2.31 



2.30, 2.29 



2.31, 2.30 



None of the previous answers. 





36 
From the site http://maple.lemoyne.edu/~giunta/rayleigh.html,
calculate the average values of the atmospheric and chemical nitrogen to 5 significant
figures. 



2.310, 2.299 



2.3102, 2.2990 



2.3101, 2.2989 



2.3103, 2.2991 



None of the previous answers. 

37 
As a result of their measurements
and very astute observational skills, what great discovery did Rayleigh and Ramsey make? 



That air also contains almost 1% of a gas that they named
argon. 



That the chemically generated nitrogen was impure. 



That they didn't remove all the oxygen from the air. 



That air contains carbon dioxide. 



None of the previous answers. 

38 
If Rayleigh had determined the mass
to only 3 significant figures, would they have made any discovery? 



Yes. 



No 



None of the previous answers. 








