What state of matter has a define volume but no definite shape ?

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.