In a physical change of matter,

a. a chemical change takes place
b. molecules break into atoms
c. no new substances are formed
d. chemical properties change

Which metal exist in liquid state and can be cut with knife ?

Which suspect most likely committed the robbery and how do you know

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]