Which contribution to the body of scientific knowledge is most recent?
a)the development of the lever
b)the confirmation of the double-helix structure of dna
c)the discovery of electricity
d)the theory of evolution

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Which proportionality applies to avogadro’s law?