When iron (Fe) reacts with molecular oxygen (O2), a new compound is formed. This compound is the Fe2O3 found in rust. 4 Fe + 3 O2 → 2 Fe2O3

If 112 g of Fe combines with 48 g of O2, how much Fe2O3 is formed?
A. 48 g Fe2O3
B. 112 g Fe2O3
C. 88 g Fe2O3
D. 160 g Fe2O3

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Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion

Which of the following is not true about the atomic model of substances?