Supplemental packet page 117

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Supplemental packet page 117
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This is a chemical recipe for the decomposition
of water by electrolysis.
products

What did John Dalton in 1808 have to say about
chemical reactions?
1. Chemical reactions involve just the simple
rearrangement of atoms.
2. Atoms are conserved in a chemical reaction. In
other words, atoms are not created nor destroyed
in chemical reaction.
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Write the following opposite supplemental packet
page 106
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Lets see if John Dalton had assumed correctly.
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Stoichiometry supplemental packet page 117
36 grams H2O produces 4 grams H2 and 32 grams O2
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Stoichiometry supplemental packet page 118
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Remember hydrogen ionss favorite charge in its
combined state is H
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Then what happened the oxygen atom in water?
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REDOX, is about the exchange of
electrons. Summary
Reduction is Gain, RIG
Oxidation is Loss, OIL
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Supplemental packet page 106
Just Shot Me
gas formation
reactant to product
Equilibrium balance
Up Down Reflux like acid reflux (heart burn)
Precipitation saturation (solid formation)
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Supplemental packet page 106
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Supplemental packet page 106
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Write this into our notes
2
1
2
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But what if an individual balanced the magnesium
first?
1
1
In my opinion, the following is the easiest way
to balance, if you 1) always balance oxygens
last 2) then multiply by factor of 2, to remove
any fractional molar coefficient that might
be present in the balanced reaction.
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2
1
Note We are going for the lowest whole
number Molar coefficient ratio
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Finally, name the compounds and give physical
states.
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Combustion of methane gas
1
1
2
1 O2 2 1O
Always balance oxygens last
? O2 4
2 2 4
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Combustion of ethane gas
1
2
2 O2 3 1O
Always balance oxygens last
? O2 7
4 3 7
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Combustion of methanol liquid
1
1
1 O2 2 1O
Always balance oxygens last
2 2 4
1 O ? O2 4
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Combustion of methanol liquid
1
1
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Now balance the combustion of glucose (blood
sugar)
1
6
6
1 O2 6 1O
Always balance oxygens last
12 6 18
1O6 ? O2 18
Substract 6 from each side
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Combination - Synthesis - PHOTOSYNTHESIS
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1
6
6
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Dont leave as a fraction, multiply through by 2
Combustion of methanol, CH4O
combustion
3 __ 2
1
1
2
Combustion of ethanol, C2H4O
1
2
3
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Combustion of formaldehyde, CH2O
1
1
1
1
What reactant was oxidized?
What reactant was reduced?
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Ionic salt transfer reactions in aqueous solution
Ionic salt solubility in water All group I salts
soluble, Li,Na,K All nitrate salts soluble All
ammonium salts soluble,NH4
Driving forces for ion transfer, a force that
makes the reaction go. Physical state
formations If a solid forms If a liquid forms If
a gas forms
Evidence for chemical change, ? Color change
(tricky) Heat evolved (tricky) precipitation
saturation (solids) If a liquid forms (heat
evolved) If a gas forms (bubbles, odor)
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Ionic salt transfer reactions in aqueous solution
Common sense tells us to mix ionic solutions in
order to have an reaction to occur. (we are not
going to mix for the sake of mixing)
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Now write the ions associated with each substance
Ag
(NO3)
Na
Cl-
Ag
(NO3)
Na
Cl-
Now write formuals for the products
Identify physical state in aqueous
solution Solubility rules need to be applied.
AgCl NaNO3
(s) (aq)
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X- charges
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Combination - Synthesis (the REDOX process
defined)
1
1
1
Analyzing the half reactions
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1
1
1
1
combining both half reactions
1 Fe(s) 1 Cl2(g) 1 FeCl2 (s)
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What reactant was oxidized?
What reactant was reduced?
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What reactant was oxidized?
What reactant was reduced?
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Combustion of methanol in PLASTIC BOTTLE
REDOX MID-TERM
1
1
1
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BATTERY DEMO
SOLUBILITY in aqueous solutions
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