physical and chemical properties
DESCRIPTION
Physical and Chemical Properties. How to describe a substance. Physical Property. Anything that can be observed or measured without forming a new substance Examples include: colour , texture, taste, smell, state, malleability and ductility “ Describes what the substance looks like”. - PowerPoint PPT PresentationTRANSCRIPT
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Physical and Chemical Properties
How to describe a substance
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Physical Property• Anything that can be observed
or measured without forming a new substance• Examples include: colour,
texture, taste, smell, state, malleability and ductility“Describes what the substance looks
like”
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Name some physical properties of sodiumColour:Silver
State:Solid
Texture: Smooth
Lustre:Shiny
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Chemical Property
• Describes how a substance reacts with another substance when forming a new substance“How a substance behaves when
exposed to another substance”
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Chemical Properties
Ex: Combustibility (how it behaves when exposed to Oxygen)
Reacts with water (how it behaves
when it is placed in water)
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Think About It! What physical and chemical properties do you see?
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Physical and Chemical Propertiesof Sodium
Chemical Properties:Very Reactive when exposed to water
Physical Properties:
Not Reactive when exposed to oil
Hardness: Soft
Colour: Silver
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QuizIs this describing a physical or chemical
Property?a) The water froze and became a solid
• Physical Property - State
b) Metal rusted when it reacted with oxygen • Chemical Property – Slow reaction with oxygen
c) The silver necklace is shiny • Physical Property - Lustre
d) The sugar tastes sweet • Physical Property - Taste
e) When magnesium and acid are combined they produce a new gas
• Chemical Property – Magnesium reacts with acid
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Types of Physical Properties
• Qualitative- a property that can not be represented by numbers- a quality of a substance
How can you describe yourself without numbers?
- Ex:Hair Colour, Eye Colour, Smell, etc.
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Types of Physical Properties• Quantitative
- a property that can be represented by numbersHow can you describe yourself using numbers?
Ex: Height, Weight, Density, Shoe Size, etc.
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Physical and Chemical Changes
How can a substance change?
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Physical ChangesA physical change is a change in the
form or state of a substanceThis includes:- Substance dissolving in another –Sugar dissolving in water
- Change of state- Boiling, freezing, evaporating
- Cutting into pieces
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What happens to salt when you put it in water?
Salt dissolves in water to create salt water
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Is dissolving a physical or chemical change?
• Can we get the salt back?• Has the salt and water changed into a new
substance?
Let’s see!
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The Bolivian Salt Plains• What you get when salt water dries up• Salt is separated from the water
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How do I know it’s a lake?• All of this is coral!
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Chemical Changes
• A chemical change is the formation of a new substance
• Ex: Burning a piece of wood produces carbon dioxide and ash (carbon)– 2 new substances are formed
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Clues for a Chemical Change
1) Colour change– brand new colour, not blue become less blue
2) Formation of a gas3) Formation of a new odour4) Formation of a precipitate (solid created from
liquids)5) Formation of light or a change in heat
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Let’s take a look at some physical and chemical changes!!!