Page 315 - (DK) The Ultimate Visual Dictionary 2nd Ed.

CHEMICAL REACTIONS

Potassium iodide
solution added to
lead nitrate
FERMENTATION DOUBLE DECOMPOSITION
solution
Potassium Lead nitrate Two solutions
iodide solution solution swap partners
(KI) (Pb(NO ) 2 )
3
Airtight
Yeast converts stopper
sugar into alcohol
(C 2 H 5 OH) and
carbon dioxide Flat-bottomed Lead iodide
gas (CO 2 ) glass flask (PbI 2 ), a yellow
solid, forms
Potassium
Yeast mixed with nitrate solution
warm water and Carbon dioxide (KNO 3 ) forms
sugar (C H 12 O 6 ) bubbles (CO 2 )
6
1. THE REACTANTS 2. THE REACTION
Potassium iodide in water When the solutions are mixed, lead
(KI) and lead nitrate in water iodide, a precipitate, and potassium
(Pb(NO 3 ) 2 ) each form colorless nitrate solution are formed.
THE REACTION solutions. 2KI + Pb(NO 3 ) 2 → PbI 2 + 2KNO 3
Yeast converts sugar and warm water
into alcohol and carbon dioxide.
C 6 H 12 O 6 → 2C 2 H 5 OH + 2CO 2
TESTING CANDLE WAX, AN ORGANIC COMPOUND
Clamp stand

Burning produces Delivery tube
carbon dioxide gas
(CO 2 ) and water
vapor (H 2 O) Delivery tube
Gases are
trapped in
Unburned funnel Stopper Stopper Tube connection
carbon forms to pump that
soot particles sucks gases
Thistle U-tube Stopper through
funnel
Flame
Water vapor
Burning condenses to Test tube
candle wax form liquid
water (H O)
2
Clamp
Water vapor
trapped by solid Carbon dioxide gas
drying agent, Anhydrous (CO 2 ) given off
anhydrous copper
copper sulfate sulfate Calcium hydroxide Calcium
Candle wax (CuSO ) (CuSO 4 ) (Ca(OH) 2 ) and hydroxide
4
(C 18 H 38 ), a carbon dioxide solution
hydrocarbon, Anhydrous copper (CO 2 ) form insoluble (lime water,
contains the sulfate crystals calcium carbonate Ca(OH) 2 )
elements (CuSO ) combine (CaCO 3 ): lime water
4
carbon and with water vapor becomes milky
hydrogen (H 2 O) to form darker
blue hydrated copper
sulfate (CuSO 4 .
10H 2 O)
1. THE BURNING REACTION 2. TESTING FOR WATER VAPOR 3. TESTING FOR CARBON DIOXIDE
Burning wax produces carbon A solid drying agent traps water vapor, proving Calcium hydroxide in solution reacts with carbon
dioxide gas and water vapor. the presence of hydrogen in the candle wax. dioxide, forming a carbonate and turning milky.
2C 18 H 38 + 55O 2 → 36CO 2 + 38H 2 0 CuSO 4 + 10H 2 O → CuSO 4 . 10H 2 O Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O

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