Chemical Physical Changes

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• Chemical Physical Changes

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Welcome to Chemistry 11 Chemistry is the study
of changes in matter- the stuff around
us. Change can be physical or chemical.
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Physical Change Nothing new is produced. Change
of state (s) (l) (g) (aq) NH4NO3 dissolves
in water Energy NH4NO3(s) ? NH4(aq)
NO3-(aq) Do not add water- not a reaction
with water. This reaction is endothermic because
it gets cold or absorbs energy. Energy is on the
left
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Chemical Change Something new is produced New
formulas New properties Colour
changes Bubbles Precipitates- solids form in
solution
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Nitrogen triiodide explodes
NI3(s) ? N2(g) I2(g) energy
2NI3(s) ? N2(g) 3I2(g)
energy Exothermic Produces energy Energy is
on the right Demo
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Classify as Chemical or physical Change
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Classify as Chemical or physical Change Gasoline
evaporating
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Classify as Chemical or physical Change Gasoline
evaporating physical
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical

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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg chemical

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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg chemical
H2O(g) ? H2O(l) energy
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg chemical
H2O(g) ? H2O(l) energy physical
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg chemical
H2O(g) ? H2O(l) energy physical 2H2O
energy ? 2H2(g) O2(g)
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Classify as Chemical or physical Change Gasoline
evaporating physical Gasoline
burning chemical Fog condensing physical I
ron rusting chemical Cooking an
egg chemical Digesting an egg chemical
H2O(g) ? H2O(l) energy physical 2H2O
energy ? 2H2(g) O2(g) chemical
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Classify as Chemical or Physical
Property Solution colour
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Classify as Chemical or Physical
Property Solution colour physical
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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y
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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y chemical
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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y chemical Density
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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y chemical Density physical
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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y chemical Density physical Reactivity

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Classify as Chemical or Physical
Property Solution colour physical Flammabilit
y chemical Density physical Reactivity
chemical
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Changes in Physical State Solid
Liquid Gas
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Changes in Physical State Solid
Liquid Gas
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Changes in Physical State Solid
Liquid Gas
Freezing solidification
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Changes in Physical State Solid
Liquid Gas
freezing
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Changes in Physical State Solid
Liquid Gas
sublimation
freezing
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Changes in Physical State Solid
Liquid Gas
sublimation
freezing
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Changes in Physical State Solid
Liquid Gas
sublimation
freezing
condensation
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Changes in Physical State Solid
Liquid Gas
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Changes in Physical State Solid
Liquid Gas
melting
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Changes in Physical State Solid
Liquid Gas
melting
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Changes in Physical State Solid
Liquid Gas
melting
evaporation
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Changes in Physical State Solid
Liquid Gas
melting
evaporation
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Changes in Physical State Solid
Liquid Gas
condensation or sublimation
melting
evaporation
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183 100 gas
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183 100 gas Aluminum 660 2327
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183 100 gas Aluminum 100 660 2327
solid
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183 100 gas Aluminum 100 660 2327
solid Wax 50 150
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Using Melting and Boiling Points to Predict
State If oxygen, aluminum, and wax were heated
to 100 0C, what state would they be in? solid
liquid gas mp (oC) bp(oC) State Oxyg
en -218 -183 100 gas Aluminum 100 660 2327
solid Wax 50 100 150 liquid
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Dissociation equations

• All ionic compounds and acids dissociate or break
  up into ions when dissolved in water

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Study Guide p. 110
Balancing Chemical Equations

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Study Guide p. 110
Balancing Chemical Equations Count the number of
each atom on reactant and product side of
equation (multiply coefficient and
subscript).
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Study Guide p. 110
Balancing Chemical Equations
___Al(s) ___I2(g) ? ___AlI3(s)
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Study Guide p. 110
Balancing Chemical Equations
___Al(s) _3_I2(g) ? ___AlI3(s)
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Study Guide p. 110
Balancing Chemical Equations
___Al(s) _3_I2(g) ? _2_AlI3(s)
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Study Guide p. 110
Balancing Chemical Equations
_2_Al(s) _3_I2(g) ? _2_AlI3(s)
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Study Guide p. 110
Step 4 Always double check your answer.
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e.g. __Al(s) __ I2(g) ? __ AlI3(s)
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Products Al 2 I 6
Reactants Al 2 I 6
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Study Guide p. 110

• Helpful Hints
• Balance elements in elemental form (Fe, O2, S8,
  P4) last.

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Study Guide p. 110

• Helpful Hints
• Balance elements in elemental form (Fe, O2, S8,
  P4) last.
• Balance polyatomic ions (e.g. SO42-) as a group
  if they dont break apart.

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Study Guide p. 110

• Helpful Hints
• Balance elements in elemental form (Fe, O2, S8,
  P4) last.
• Balance polyatomic ions (e.g. SO42-) as a group
  if they dont break apart.
• Balance oxygen and hydrogen last.

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Example
__C8H18(s) __ O2(g) ? __ CO2(g) __ H2O(g)
12.5
8
9
25 Oxygen
16 Oxygen 9 Oxygen 25 Oxygen