Two hundred grams of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table to identify the substance. q equals m C delta T. Mass (m) is in grams. Temperature is in degrees Celsius. A gold B iron

C copper

D ethanol

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

The phase where ice changes directly to gas is called sublimation