Which is not true for combustion reactions? a. they produce carbon dioxide and water
b. a candle burning
c. they always occur in the presence of oxygen
d. they usually require a lot of energy to form products

What material does not melt at any temperature

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.

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions