What is the minimum number of kilojoules needed to change 40.0 grams of water at 100 degree celsius to steam at the same temperature and pressure?

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh