* separar palavras-chave com vírgula
Melhores sites chemistry 1-15:
1.
academia.edu 
496,628

2.
sciencedaily.com 
266,228

3.
omicsonline.org 
150,866

4.
uoguelph.ca 
150,488

5.
quia.com 
128,347

6.
nap.edu 
108,952

7.
ptable.com 
70,684

8.
nobelprize.org 
70,100

9.
chemguide.co.uk 
54,105

10.
science.gov 
47,509

11.
eurekalert.org 
47,262

12.
york.cuny.edu 
34,926

13.
bzu.edu.pk 
32,080

14.
weegy.com 
32,011

15.
examfear.com 
28,726

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