What is the mole ratio of Fe to Fe2O3 in the following reaction? 3 Fe + 4 H2O --> Fe3O4 + 4 H2 Group of answer choices 4/1 3/1 3/4 3/3

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.

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.