properties of matter. what is a property? property: a characteristic of a substance that can be...
TRANSCRIPT
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Properties of Matter
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What is a property?
• Property: a characteristic of a substance that can be observed
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Physical Property
• malleability: the ability to be hammered into a thin sheet
• ductility: the ability to be stretched into a wire
• melting point
• boiling point
• density
• solubility
• specific heat• luster
Physical property: a property that can be observed without changing the identity of the substance.
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Special Physical Properties
Melting point: the temperature at which a substance changes from a solid to a liquid at a given pressure
water = 0oC
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Special Physical Properties
Boiling point: the temperature at which a substance changes from a liquid to a gas at a given pressure
water = 100oC
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Chemical Properties
• Chemical property: a property that can only be observed by changing the identity of the substance
• Examples:• flammability
• ability to rust
• reactivity with acids
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Physical Change
A physical change occurs when the substance changes state but does not change its chemical composition.
The form or appearance has changed, but the properties of that substance are the same.
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Chemical ChangesA chemical change occurs when a substance changes into something new. This occurs due to heating, chemical reaction, etc. You can tell a chemical change has occurred if the density, melting point or freezing point of the original substance changes.
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What kind of change is it if someone...
• Mixes vinegar and baking soda?
Chemical change
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What kind of change is it if someone...
• Tears up paper?
Physical change
• Mixes salt and water?
Physical change
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What kind of change is it if someone...
• Burns paper?
Chemical change
• Evaporates salt water?
Physical change
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Density
• Density is a measure of how matter is squeezed into a given space
• Density = mass/volume• g/cm3 or g/mL• Density is an intensive
property• Density is constant for
any given material directly proportional
What happens to the density of a chocolate bar when you break it in two?
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When a loaf of bread is squeezed does its density increase?
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A loaf of Wonder bread weighs 20.0 oz. and has the dimensions 25 cm x 9 cm x 12.5 cm. If the loaf is compressed by ½ does the density increase?