
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 scientific 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} 



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 accuracy. 



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://web.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://web.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 and Ramsay had determined the mass to only 3 significant figures, would
Raleigh and Ramsay have discovered argon? 



Yes. 



No 



None of the previous answers. 








