| Question |
Answer |
| binary compounds |
A compound that is composed of two different elements. |
| chemical equations |
An equation that represents the changes that take place in those compositions as the substances react. |
| chemical formula |
A shorthand method of expressing the makeup of a compound (pure substance). |
| coefficients |
A number placed before a formula to balance an equation. |
| combination reactions |
Reactions that combine two or more substances into one more complex compound. |
| decomposition reactions |
Reactions that decompose or take apart the formula units or molecules of a substance. |
| double-replacement reactions |
In this reaction, two ionic compounds swap cations and anions with each other. |
| electrolysis |
A decomposition reaction that decomposes the reactants by an electric current in solution. |
| endothermic reactions |
A reaction that requires thermal energy. |
| exothermic reactions |
A reaction that gives off thermal energy. |
| oxidation numbers |
Symbols that indicate the number of electrons that an element gains or loses as it bonds. |
| polyatomic ions |
A group of several atoms that act as a single charged particle. |
| precipitates |
A solid formed during a reaction; insoluble in water. |
| products |
A substance (on the right hand side of the equation) that is produced by a chemical change. |
| reactants |
A substance (on the left-hand side of the equation) that undergoes a chemical change. |
| single-replacement reactions |
In this reaction, one element in an existing compound is replaced by another element. |
| subscripts |
A small number placed beside the symbol of an element in a formula to indicate the number of atoms of that element contained in the compound represented by that formula. |
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