2A1Cl3 + 3Na CO3→ Al2(CO3)3 + 6NaCl

Name the first reactant:

How many sodium atoms on the reactant side?

How many Oxygen atoms on the product side?

1. aluminum chloride

2. 3

3. 9

Explanation:

1. Know the names

2. reactants are on left side products are on right side

answersilicon (si); oxygen (o);

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.