5.1 Physical and Chemical Properties
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Transcript of 5.1 Physical and Chemical Properties
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Have you observe these situation
before?
Raining
Fireworks
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yA change of physical propertieswithout the formation of newsubstance.
y Involves little or no change in energy.
yExample:
-.Drying wet clothers
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yChemical composition ofthe materialproduced remains the same.
yRevisible (can be changed back tooriginal substance).
yExample:
-.Melting of ice
-.Evaporation of water.
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Example of physical changes in daily life:
-.Melting of i
ce
-.Freezing of water
-.Boiling of water
-.Condensation of gas-.Evaporation of water
-.Raining
-.Dissolving salt in water
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y A change which produces one or more newsubstances.
y Chemical composition of the materialproduced difference from the originalsubstance.
y Irrevisible (cannot changed back to original
form).y Involved absorption and release more
energy.
y Example:
-. Burning of paper-. Sliced apples
-. Fireworks
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Example ofchemical changes in daily life:
-. Rusting of iron-. Lighting a match stick
-. The rotting of egg
-. Photosynthesis
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Physical Changes Chemical Changes
Both need energy
Formation of newsubstances
Energy requirement
Decomposition &formation process
Reversible
Chemicalcomposition and
properties
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1. Which of the following statementsis correct about physical change?I. It is reversible.II. Less energy is required.III. A new substance is formed.
A. I only.B. I and II only.
C. II and III only.
D. I, II and III.
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2. Which ofthe following is not truewhen copper (II) sulphate crystalsare dissolved in water?
A. The change is reversible.B. A physical change occurs.
C. A new substance is formed.
D. It involves the rearrangementmolecules.
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3. Which of these processes isreversible?
A. Dissolving sugar.
B. Digestion of food.C. Burning tree branches.
D. Reaction of metal with acid.
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4. Sublimation of dry ice:
I. Produ
c
esch
ange in ph
ysic
aland chemical composition.
II. Does not form new substance.
III.Requires li
ttle energy.
A. I only.
B. I, II and III.C. I and II only.
D. II and III only.
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5. Which of the following is achemical change that occursduring the making of a car?
A. Painting the body ofthe car.B. Fixing the steel into sheets.
C. Rolling the steel into sheets.
D. Making plastic from oilproducts.
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6. Which of the following combinationof factors is evidence of the
occurrence of a chemical change?I. Production of gas.
II. Formation of precipitate.
III. Irreversible.
A. I, II and III.
B. I and II only.C. I and III only.
D. II and III only.
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7. Which of the following is the differencebetween physical and chemical changes
A. Physical changes involves more energycompared to chemical change.
B. Physical change is reversible and chemicalch
ange is irreversible.
C. Physical change produces new products andchemical change does not produce newproduct.
D. Physical change causes changes in chemicalcomposition and chemical change causeschanges in physical properties.
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8. Which of the following involves achemical change?
I. The rotting of egg.
II. Milk turns sour.
III. An apple slice turns brown.
A. I, II and III.
B.I
andII
only.C. I and III only.
D. II and III only.
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9. Figure below shows the changes in the states of matter.
a). Name the process that occurs.
Melting of ice
b). i. What kind ofchange happened in the figure?Physical Changes
ii. State 3 characteristics of the change mentioned in (b)above.
1. Revesible
2. Less energy required
3. No new substance produced
4. No Changes ofchemical composition and properties
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Physical ChangesC
hemicalC
hanges
Produces new
substances thathaveproperties whichcan
be different fromth
ose ofth
e originalsubstances
Change involvingonly the physical
state, withoutforming any new
substances
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Energy requirement
Formation of newsubstances
Chemical Compositionand Properties
Reversible
MoreLess
No Yes
Do notChange
Change
Yes
Physical Changes Chemical Changes
Both need energy
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