Chemistry Test #1 Flashcards
Length
Meter
Volume
Liter
Mass
Gram
Dimensional Analysis
Given*(Desired/Given)=Desired
Precision
How close a series of measurements are to each other
Accuracy
How close a value is to an accepted value
Sig Figs
- All non-zero numbers are always significant
- Captive zeros are always significant
- If a decimal point is present, the trailing 0’s are significant
- If a decimal point is NOT present, trailing 0’s are NOT significant
- Leading 0’s are not significant
Adding/Subtracting Decimal Places
smallest # of decimal places
Multiplying/Dividing Sig Figs
the number with fewest sig figs that’s being multiplied is the number of sig figs in the answer
mixture
combination of two or more substances in any proportion
Compound
Substances in fixed proportions
Homogeneous
Same composition throughout
Heterogeneous
Varies in its composition
Solution
Homogeneous mixture with tiny particles (to small to see/settle or be filtered out.
Colloid
Homogeneous mixture with medium-sized particles (big enough to see, to small to settle or be filtered out)
Suspension
Homogeneous mixture with large particles (big enough to see & be filtered out)
Elements
Substances that are unable to be broken down further, atom is the smallest particle
Compounds
Two or more different elements that are chemically combined
Phase
Physical Property
Color
Physical Property
Odor
Physical Property
Flammability
Chemical Property
Boiling Point
Physical Property
Melting Point
Physical Property
Density
Physical Property
Reactivity
Chemical Property
Physical Property
Can be observed/measured without changing the composition
Chemical Property
Can only be observed during or after a chemical reaction
Chemical Change
a substance becomes another having a different composition & properties
not reversible using ordinary physical means
Compunds can be
separated into elements by chemical means
Un-mix mixtures through
Filteration, Distillation & a Seperatory Funnel
Chromatography
Separating Components in a Mixture
Percent Error
(M-A)/A*100
