Consider the following reaction:2HBr(g)-->H2(g)+Br2(g)A ) In the first 20.0 s of this reaction, the concentration of {\rm HBr} dropped from 0.570 M to0.475 M. Calculate the average rate of the reaction in this time interval. B) If the volume of the reaction vessel in part (b) was 1.50 {\rm L}, what amount of {\rm{Br}}_2 (in moles) was formed during the first 15.0 \rm s of the reaction?

During metamorphic processes, increased pressure and temperature can affect the of minerals in rock. rocks subjected to very high pressure are typically than others because mineral grains are squeezed together, and the atoms are more closely packed. during metamorphic processes, water facilitates the transfer of ions between and within minerals, which can the rate at which metamorphic reactions take place. the growth of new minerals within a rock during metamorphism has been estimated to be about per million years. metamorphism is commonly associated with convergent plate boundaries, where two plates move toward each other. during contact metamorphism, a large intrusion will contain thermal energy and will cool much more slowly than a small one. metamorphosed sandstone is known as the metamorphic rock made from metamorphosed shale, was once used to make blackboards for classrooms.

What material does not melt at any temperature

Ajar contains a certain substance. which observation would show that the substance must be either a solid or a liquid?