methods, chem, physics revision

diff --git a/chem/graphics/acids-bases.md b/chem/graphics/acids-bases.md
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+# Acids and bases
+
+## Examples
+| name | acid | base |
+| ---- | ---- | ---- |
+| Hydrochloric acid | HCl | Cl- |
+| Sulfuric acid | H2SO4 | HSO4-, SO4 |
+| Ethanoic acid | CH3COOH | CH3COO- |
+| Butanoic acid | CH3(CH2)2COOH | CH3(CH2)2COO- |
+| Nitric acid | HNO3 | NO3- |
+| Citric acid | C6H8O6 | C6H7O6-, C6H6O6(2-), C6H5O6(3-) |
+| Propanoic acid | CH3CH2COOH | CH3CH2COO- |
+| Phosphoric acid | H3PO4 | H2PO4-, HPO4(2-), PO4(3-) |
+| Hydrogen cyanide | HCN | CN- |
+| Water | H2O | OH- |
+| Carbonic acid | H2CO3 | HCO3, CO3(2-) |
+| Ammonium | NH4+ | NH3 |
+
+monoprotic / diprotic / triprotic - refers to no. of bases  
+Acid-base reaction: conjugate acid-base pairs (differentiated by one H+)
+H30+ - hydronium ion
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diff --git a/methods/stuff.md b/methods/stuff.md
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diff --git a/physics/light-matter.md b/physics/light-matter.md
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--- a/physics/light-matter.md
+++ b/physics/light-matter.md
@@ -105,7 +105,8 @@ $$\rho = {hf \over c} = {h \over \lambda}$$
 
 
 ### Absorption
-- Black lines in spectrum show light not reflected  
+- Black lines in spectrum show light not reflected
+- Frequency of a photon emitted or absorbed can be calculated from energy difference: $E_2 – E_1 = hf$ or $= hc$
 
 ### Emission
 
@@ -166,6 +167,17 @@ Therefore, position and velocity cannot simultaneously be known with 100% certai
 
 **Quantum mechanical model** - electron clouds rather than discrete shells (electrons are not particlces). We can only calculate probability of an electron being observed at a particular position
 
+Newton's and Einsteins models work together  
+
+### Photon-electron interaction
+
+When a photon collides with an electron, momentum is transferred to electron.
+
+$$\rho_{\text{photon}}={h \over \lambda}$$
+$$E=\rho c$$
+
+
+
 
 
 774 abc melbourne
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