When the internal energy of a material increases___. Need help please

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

Which is true about metals used for jewelry, such as platinum and gold? a. they have low flammability. b. they have low reactivity. c. they have high flammability. d. they have high reactivity.