Merge: forgot some shit again

diff --git a/chem/graphics/acids-bases.md b/chem/graphics/acids-bases.md
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+++ b/chem/graphics/acids-bases.md
@@ -0,0 +1,21 @@
+# 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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+# Index laws
+
+$a^m \times a^n = a^{m+n}$  
+$a^m \div a^n = a^{m-n}4$  
+$(a^m)^n = a^{_mn}$  
+$(ab)^m = a^m b^m$  
+${({a \over b})}^m = {a^m \over b^m}$
+
+# Fractional indices
+
+$^n\sqrt{x}=x^{1/n}$
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diff --git a/physics/light-matter.md b/physics/light-matter.md
index a2d5f6dfc60580a251e2eee8b3ce6b07a33daedb..ce114bac8b0daeddb34a5c65ac2b632fb06d4adb 100644 (file)
--- a/physics/light-matter.md
+++ b/physics/light-matter.md
@@ -110,7 +110,8 @@ $$\rho = {hf \over c} = {h \over \lambda}$$
 
 
 ### 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
 
@@ -171,6 +172,17 @@ 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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diff --git a/spec/calculus.md b/spec/calculus.md
index ddd9011301d70a8d9681fdb5d0c0380ffc8143db..91440e566495b233302286ee3df29c55ce79e199 100644 (file)
--- a/spec/calculus.md
+++ b/spec/calculus.md
@@ -217,13 +217,11 @@ To find stationary points of a function, substitute $x$ value of given point int
 
 $${dV \over dt} = {\operatorname{change in volume} \over \operatorname{respect to time}}$$
 
-`     |->--diff-->--| |-->--diff-->--|
-displacement    velocity    acceleration
- |--<-antidiff-<---| |--<-antidiff-<-|`
-
-**displacement $x$** - change in position  
-**velocity $v$** - change in displacement  
-**acceleration $a$** - change in velocity
+**position $x$** - distance from origin or fixed point  
+**displacement $s$** - change in position from starting point (vector)  
+**velocity $v$** - change in position with respect to time  
+**acceleration $a$** - change in velocity  
+**speed** - magnitude of velocity
 
 $$v_{\operatorname{avg}}={\Delta x \over \Delta t}={{x_2 - x_1} \over {t_2 - t_1}}$$
 $$\operatorname{speed}_{\operatorname{avg}}={\Delta v \over \Delta t}$$