diff --git a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md
index 081ecf5..df1a3a6 100644
--- a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md	
+++ b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md	
@@ -49,19 +49,31 @@
     - neutralization
 
 ## Sythensis
-- When 2 or more substances combines into one substance
+- When 2 or more substances combine into one substance
 - $`A + B \rightarrow AB`$
 
 ## Decomposition
-- With a substance breaks down into 2 or more substances
+- When a substance breaks down into 2 or more simpler substances
 - $`AB \rightarrow A + B`$
 
 ## Single Diplacement
-- When 
+- When an element displaces another of the same group in a substance
+- $`A + BC \rightarrow B + AC`$
 
 ## Double Displacement
+ - When two cations switch places in two substances
+ - $`AB + CD \rightarrow CB + AD`$
+ - Note: If both products would be aqueous, there is no reaction
 
 ## Combustion
+ - Two types: Combustion with metals and combustion with hydrocarbons
+ - Combustion requires heat but for the purposes of grade 10 chemistry this is ignored
+ - Combustion with metals
+    - When a pure metal and oxygen gas react to produce the most common oxide
+    - e.g., $`2Mg + O_{2(g)} \rightarrow 2MgO_{2(s)}`$
+ - Combustion with hydrocarbons
+    - Two types: Complete and incomplete
+    - When a hydrocarbon reacts with oxygen gas to produce 
 
 ## Neutralization