What is the name of the compound, C9 H18? A. 1,3 diethylcyclopentane
B. 3,1 diethylcyclopentane
C. 1,3 dimethylcyclopentane
D. 3,1 dimethylcyclopentane

What happens to the temperature of a substance when the average kinetic energy of its particles increases?

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect