When glass is formed, which of these takes place first?
a) the sand turns to liquid.
b) the molecules become hard.
c) the sand is heated intensely.
d) the molecules become disordered.

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation