What is the ratio al 3+ ions to s 2- ions in a neutral compound

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.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer