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Text Elements
youll have 2 hydrogens, 2 diatomics, react with oxygen to make water thats a chemical reaction
Observations of a chemical reaction ( change) gopec: gas production odor change precipitate formation ( insoluble solid that is formed when 2 aqueous solutions are reacted ) energy change ( production of light or heat ) exothermic reactions ( heat given off ) ( things get hotter ) endorthermic reaction ( things get colder )
the “sentence” of chemistry
reactants
products
new substance formed
aqueous means disolved in water
5 Acids youll need to know:
Mg(s)
2 HCl (aq)
MgCl2(aq)
H2(g)
K(s) + CaBr2(s) → KBr(s) + Ca(s)
if you have an ionic compound without any water in the equation that is also a solid
metals are solids except mercury
Cu+2 (NO3)-1 Na+1 OH-1 Cu+2 OH-1 Na+1 NO3-1 Cu(No3)2 + NaOH - > Cu (OH)2 + NaNO3
Cu + S → CuS
CaS - > Ca + S
AgI + K - > Ag + KI
KI + AgNO3 → AgI + KNO3
Acids you need to know: HCl : Hydrochloric H2SO4: Sulfiric H2CO3: Carbonic HC2H3O2: Acetic HNO3:Nitric
Mg + O2 → MgO + heat
6
24
2
8
4
8
12
8
3
6
18
C
H
O
Reactants
Products
1
4
2
2
3
1
2
2
1
1
H
PO4
Ca
Reactants
Products
3
1
1
2
3
1
OH
2
1
3
3
6
6
6
6
2
2
2
1
HOH
H
CI
Ca
Reactants
Products
1
1
1
2
1
1
OH
2
1
2
2
2
2
2
2
Video practice problem
2_ H2 + ___ O2 - > _2 H2O
products
reactants
H
O
2
2
2
1
2
4
4
products
reactants
Fe
O
1
2
2
3
4
2
3
2
2KBr
2
1
Ca
Cl
2
1
soluble ( check rules (ref sheet) )
soluble ( check rules )
Insoluble
Insoluble
Soluble
Soluble
base = metal + hydroxide ( OH is on the END ) acid = hydrogen infront of anything
B
A
AB + CD → AD + CB
KSO4 + HOH
2
2
K
+1
I
-1
(aq)
Ag
+1
(aq)
NO3
-1
(aq)
AgI
K
+1
(aq)
- NO3
+1
(aq)
(s)
Ag
+1
(aq)
I
-1
(aq)
(aq)
AgI
(s)
2Na+1(aq) + 2OH-1(aq) + Cu+2(aq) + 2Cl-1(aq) → 2Na+1(aq) + 2Cl-1(aq) + Cu(OH)2 (s)
2OH-1(aq) + Cu+2(aq) → Cu(OH)2 (s)
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