28. After 3 substances are mixed, an odor emits a. chemical change
b. physical change
c. thermal energy is used
a do

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

What three things determine the shape and size of a puddle when water is poured out onto a surface

How many moles of al3+ ions are in 1.25 moles of al2o3