Chemical Reactions

This past week in class, we started learning about our next unit, Chemical Reactions. You can tell when a chemical change is occurring thanks to sensory clues. These are things such as:
-color change
-a solid forms
-bubbles form
-heat/flame is produced or absorbed
Here is a link to a website that I found that has a list of chemical reactions that occur in our everyday life: 10 Chemical Reactions

In a chemical reaction equation, there will be a small letter(s) after each compound, telling you what state it's in. These are:
-g (gas)
-l (liquid)
-s (solid)
-aq (aqueous)

Here is an example of what one of these equations might look like:

Source for above picture

When you change the coefficient in a compound, it changes the amount of the element in it. When you change the subscript, it changes its composition and identity.

Here is an example of how to write out a balanced chemical equation:

-Methane reacts with gaseous oxygen to form gaseous carbon dioxide and water.
CH4 + 2O2(g) --> CO2(g) + 2H2O

Here is a helpful website that I found that explains this process more in-depth: Writing a Chemical Equation