Update Unit 1: Chemistry Part 2.md

Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md

@@ -13,3 +13,27 @@
 - `ite` ions make `ous` acides (suffix). $`HCLO_2 = `$ Chlor**ous** acid
 - `ate` ions make `ic` acides (suffix). $`HCLO_3 = `$ Chlor**ic** acid
 - Prefixes stay the same
+
+## Chemical Change
+- Similar to chemical reaction
+
+## Evidence of chemical change: (observations that tell us its happening)
+1. A new gas is formed (new odour, formation of bubbles)
+2. A large change in energy (eg. Light, heat, sound, electricity)
+3. A new colour is formed
+4. A new solid is formed
+
+## Representing chemical reactions
+- A Chemical equation!
+    - Used to model what is happening during a chemical reaction.
+    - We use an arrow instead of an equal sign to show `beomces`, `reacts to form`, `produces`
+    - On the **left** side, we always have the **`REACTANTS`**, (INPUT), these get used up in the chemical reaction
+        - There can be plus signs to show multiple `reactants`. (Recipes, we are adding them together)
+    - On the **right** side, we have the **`PRODUCTS**` (OUTPUT).
+        - Newly produced/made from `reactants`  
+        - Plus signs show multple products, more like an **AND** more than anything else
+- In a chemical reaction, reactant, molecules/atoms/formula units/ions reaarange to produce products moleccules/atoms/ions/formula units
+- eg. Wax $`+`$ oxygen gase $`\rightarrow`$ Soot $`+`$ Water $`+`$ Carbon dioxide. 
+- A `word` equation 
+- $`\triangle`$ Greek letter to represent heat.
+- $`C_{25}H_{52(g)} + O_{2(g)} \rightarrow^\triangle C_{(g)} + H_2O_{(g)} + CO_{2(g)}`$