Chemistry Grade 7 Sem 1 Final Exam (Chapter 1 Lesson 2 & 3)
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Last updated 1:35 PM on 11/21/22
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25 Terms
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Physical Property
A characteristic of a substance that can be observed and measured without changing the identity of the substance.
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What can be used to detect physical properties?
Senses
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Examples of Physical Properties
color, shape, texture, size, electrical conductivity, density, thermal conductivity, malleability, melting point, boiling point, luster, magnetic attraction, mass, volume
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State of Matter
The physical form in which a substance exists
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Density
The amount of mass in a given volume
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Electrical conductivity
A measure of how well an electric current can move through a substance
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Thermal conductivity
The rate at which a substance transfers heat
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Malleability
The ability of a substance to be rolled or pounded into various shapes.
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Luster
Shininess
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Melting point
The temperature at which a substance changes from a solid to liquid
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Boiling point
The temperature at which a substance changes from a liquid to
gas
gas
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Chemical property
A property that describes a substance's ability to change into a new substance with different properties
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Examples of chemical properties
Flammability, reactivity with substances such as oxygen, water and acids, rusting, tarnishing
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Why are rusting and tarnishing chemical properties?
Because the metal changes.
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Flammability
The ability of a substance to burn
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What substances are formed when wood burns?
Water, carbon dioxide and ash
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Reactivity
The ability of a substance to interact with another substance and form one or more new substances.
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Characteristic properties
Properties unique to a substance
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Physical change
A change that affects one or more physical properties of a substance
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Chemical change
A change that occurs when one or more substances change entirely into new substances with different properties.
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What do you do to witness a log's flammability?
You must set it on fire.
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Examples of chemical changes
Production of an odor, production of a gas, formation of a precipitate, change in color, change in energyP
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How does a chemical change occur when an antacid is dropped into a glass of water?
The tablet makes contact with the water and begins to react to it, so bubbles of gas appear.
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Precipitate
When liquids combine to form a solid
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Law of Conservation of Mass
In ordinary chemical and physical changes, mass is not created nor destroyed but is only transformed into different substances.
