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List qualifications for purse substances
- single chemical
- one kind of matter
- has one definite composition
- has definite properties
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List the qualifications for mixtures
- two or more chemicals
- many compositions possible (variable)
- properties depend of composition
- can be separated by physical means (running a current through)
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What are the two types of matter?
pure substances and mixtures
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What are the two types of mixtures?
Homogeneous and heterogeneous
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What are the two types of pure substances?
Elements and compound.
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List the qualifications for homogeneous mixtures.
- uniform composition
- uniform appearance
- solution
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What does the prefix "homo" mean?
same
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What does the prefix "hetero" mean?
different
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What are the qualifications for heterogeneous mixtures?
- non uniform composition
- non uniform appearance
- distinct parts (phases)
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List the qualifications for elements.
- cannot be separated or decomposed into other purse substances
- contains 1 type of atom
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List the qualifications for compounds.
- can be separated into other purse substances
- contains 2 or more kinds of atom
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List the qualifications for physical properties.
- Characterize physical states of behavior of something
- description by senses (color, shape, odor)
- measurable (mp, bp, density)
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List the qualifications for chemical properties.
- describe the ability of a substance to change into a new substance
- list of chemical changes possible
- "may react to form.."
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List the qualifications for physical changes.
- changes of state, but substance remains the same.
- New form of old substance
- no new substance
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What's the difference between chemical change and property?
a chemical property is the potential for a chemical change, a chemical change is when a substance already changed.
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A pure substance..
can never be separated into parts by physical means
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What is the standard symbol for liter?
L
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Chemistry is the study of..
matter and its changes from one substance to another.
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A compound..
can always be broken down chemically into simpler components.
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What is the standard symbol for centi?
c
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What is the standard symbol for liter?
L
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Is a cubic meter a derived or standard unit?
derived.
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Is a liter a derived or standard unit?
derived.
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Science..
attempts to observe/explain the world.
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The forces that drive science are..
defense, profit and benefiting mankind
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define law
generalization that summarizes results - no explanation
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define hypothesis
tentative explanation
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define theory
explanation of why law exists
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define model
physical or mathematical representation of theory
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write the model for the scientific method
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Matter..
has mass, occupies space
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define energy
the capacity to do work
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list the qualifications for mass
- depends on quantity of matter, not dependent on location
- cant be zero
- measured in grams
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list the qualifications for energy
- depends on gravitational force
- measured in pounds
- can be zero
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List the qualifications for solids
- form: rigid
- compressability: very low
- shape: constant
- volume: constant
- movement of particles: vibration in fixed position
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List the qualifications for fluids
- form: fluid
- compressability: very low
- shape: variable
- volume: constant
- movement of particles: slide, some attraction
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List the qualifications for gasses
- form: fluid
- compressability: very high
- shape: variable
- volume: variable
- movement of particles: random, independent
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