Grades 9 and 10 - Chemistry - High School - Chemistry - Word Equations — Flashcards

When chemicals react together new chemicals are made from the original ones present. One of the best ways of describing what happens in the reaction is to write a chemical equation. When writing a chemical equation you can use two methods - using symbols to represent the chemicals or by using words. A chemical equation tells you which chemicals reacted together (the reactants) and the new chemicals that were made in the reaction (the products). An example is the reaction of sodium with oxygen:

sodium + oxygen → sodium oxide.

Sodium and oxygen are the reactants and there is just one product, sodium oxide.

In most cases, for reactions involving metals, there are fairly simple rules that you can follow. For example, if you know that metal carbonates react with strong acids to form the metal salt, water and carbon dioxide, and you know which salt comes from which acid, you are able to write a word equation for the reaction of any metal with the acids that you know about - that's around 300 word equations from a couple of simple pieces of information. If you haven't realized that, then chemical equations are going to be tough for you because you will have to learn them all individually! You will only be asked to write them for reactions you have come across during your studies. 

For reactions between non-metals (including hydrocarbon fuels burning), it is a bit more complex. For example, the reaction of sulfur with oxygen:

sulfur + oxygen → sulfur dioxide.

You would need to know the product is sulfur dioxide and not sulfur oxide - but if you think about it, it is always sulfur dioxide that you will have heard of during your study of science.