Which two statements are true? A. The samples both have a metallic luster.
B. The samples are the same color.
O C. The samples have the same hardness.
O D. The samples have the same streak.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.