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The difference in concentration of a substance across a space is called
asked
Dec 9, 2017
Biology
high-school
1
answer
1
vote
112k
views
What is the value of b2 - 4ac? 1 = 2x2 + 5x?
asked
Sep 23, 2017
Mathematics
high-school
1
answer
1
vote
187k
views
Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%) and C-13 (natural abundance is 1.07%). How many C-13 atoms are present, on average, in a 30000-atom sample of carbon?
asked
Aug 16, 2017
Chemistry
high-school
1
answer
5
votes
37.1k
views
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