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21 Cards in this Set
- Front
- Back
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define "chemistry"
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chemistry is the study of matter and the changes it undergoes
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whats the difference between atoms and molecules?
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everything is made of atoms and molecules
atoms are single elements and molecules are made up of different atoms |
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describe the steps in the scientific method
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Observations
Law hypothesis theory experiments |
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what's the difference between a law and a theory?
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laws predict what will happen
theories predict why things happen which allows you to predict what will happen |
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what is a hypothesis?
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A hypothesis is an explanation of a single or small
number of observations. |
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what's an observation?
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an observation tells you what happened in a single event
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what's an experiment?
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experiments are tests of laws, observations and theories
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be able to convert to and from scientific notation
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8====D<~~~~~
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Sig figs?
9.01 |
3
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Sig figs?
90 |
1
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Sig figs?
900.01 |
5
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what are exact numbers and how do arise?
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exact numbers arise only in conversions
example: 1 inch = 2.54 cm (exactly) |
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be able to round quantities to a specified amount of sig figs.
and be able to calculate wiht the correct amount of sig figs |
( . Y . )
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correctly identify the SI units
cm mm mL L m km Mm s m^3 |
centimeter
millimeter milliliter liter meter kilometer megameter seconds cubic meters |
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what is density?
be able to find density using mass and volume be able to find volume using mass and density be able to find mass using volume and density |
density= mass/volume
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what are the states of matter?
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solid
liquid gas |
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define matter
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matter is anything that occupies space and has mass
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how do crystaline and amorpheous solids differ?
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crystaline colids have their particles arranged in an orderly geometric fashion whereas amorpheous solids particles are not arranged
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what's the difference between a pure substance and a mixture?
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a pure substance is made of only one element (example: H)
a mixture is made of more than one element (example: H2O) |
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define exothermic
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describes a process that releases heat energy
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define endothermic
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describes a process that absorbs heat energy
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