chemical equations

[qcuyler]

Please fill in the blanks.

When a piece of magnesium is added to dilute hydrochloric acid, fizzing occurs and hydrogen gas is released from the mixture. The fizzing is evidence that a(n) __________________ has occurred between magnesium and hydrochloric acid. The name given to either magnesium or hydrochloric acid in this case is _________________, and the hydrogen gas that is released is called a(n) ___________________of the reaction. Some other indications that reactions have occurred might be change of color or ________________, or formation of a solid ______________. If a thermometer is placed into a mixture undergoing chemical reation, you might observed that the temperature has gone up or down, indicating that ______________ was being released or absorbed. The short hand form by which a reaction is represented is called a(n) __________________. In using this method of representation, you must satisfy the ______________, a principle that states that matter is neither created nor destroyed. In order to satisfy this principle, you normally select the proper numerical _______________ to indicate the number of units of each substance taking part in the chemical change.