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Chem 1120 Unit 1.2 - 1.5 Homework
- Course
- Chem 1120
- Institution
- East Carolina University
This is a comprehensive and detailed homework on unit 1.2, 1.3,1.4 and 1.5 for Chem 1120. *Essential Study Material!!
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1.2 State of Matter:Matter exists in 3 forms:
- Solid
- Liquid
- Gas
Solid: has a definite volume and a definite shape that does not change.
- Ex; wooden block, marbles, or a cube of ice
Liquid: Has a definite volume but indefinite shape.
- Ex; water, soda
Gas: Has neither a definite volume or definite shape.
- Expands to fill any container it is placed in
- Ex; helium, balloon, steamed form of boiling water
The conversion of a substance from one state to another is known as a change of state.
1.3 Classification of Matter:
● Pure Substance: Uniform in its chemical composition and its properties to the
microscopic level.
● Mixture: can vary in both composition and properties, depending on how it's made.
● Homogeneous Mixture: Blend of two or more pure substances having uniform
composition at the microscopic level.
- Ex; Sugar dissolved in water
● Heterogeneous Mixture: Blend of two or more pure substances having non uniform
composition.
- Ex; Veggie stew
● Element: A pure substance that can not be broken down chemically into simpler
substances.
● Chemical Compound: Any pure material that can be broken down into simpler substances
by a chemical change.
1.4 Chemical Elements and symbols:
● Elements combine to form chemical compounds.
● Symbols are combined to produce chemical formulas
1.5 Chemical Reactions- Examples of Chemical Change:
● Reactants are on the left and products are on the right and an arrow connects the two
parts together causing what's known as a chemical change.
1.6 Physical Quantities- Units and Scientific Notation:
● Physical Quantities: Mass, volume, temperature, density, and other physical properties
that can be measured and described by both a number and a unit that defines the nature
and magnitude of the number.
● Scientists around the world agreed on a system of standard units, this system is called by
the French name Systeme International d’Unites (SI units).
● Mass = kg
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