Acar slowing down for a stop sign in an example of? a. positive speed b. positive acceleration c. negative acceleration d. negative speed 50 !

ISSA D im correct right dood                        
                        

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

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