Acup of hot water cannot melt a large block of ice. however the same block melts when dropped into a lake. this is because?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.