Julio eats a taco for dinner. What represents a physical change in the taco? A) saliva changing the starch in the crust to sugar

B) teeth tearing off a bite of a taco

C) chemicals in the stomach digesting proteins

D) breaking down of fats in the taco by bile

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.