Ch 1 Flashcards
Law
Consistent set of observations( no explanation of why. Only how)
Hypothesis
Explanation on why
Matter
Anything with volume and mass
Physical property
Color. Mp. Bp. Hardness. Thermal and electrical conductivity.
Chemical prop
How a material undergoes chemical change. Flammability. Corrosivity. Acidity. Basicity.
Chemical change
Transformation of 1 or more atoms or molecules into one or more diff molecules.
Elements
Substances can’t be broken down into simpler substances by either physical or chemical means.
Compounds
Substances containing 2 or more elements (break down chemically but not physically)
Heterogenous
Keep forming physical separations until no
Longer separates anything
Amorphous
Atoms have no longneck term order or range
Microscopic
Atoms and molecules
Macroscopic
Pure or mixture
Filtration
Solid in liquid but don’t know if either is pure yet so you do distillation
Distillation
Uses physical property observations; Lowe bp will evaporate faster.
Intensive
Independent on amount of substance ( mp. Bp. Temp. Concentration. Density. )
Extensive
Dependent on amount of substance. ( mass and volume)
Accuracy
How close to the true value
Precision
How close your measurements are together.
Sig fig add and subtracting
Fewest digits right of decimal is how many dig figs in final answer
Mult. And division sig fig
Least number in any factor
Logs and antiogs sig fig
However many are in the mantisa( end of starting #) is how many sig figs.
Molecule
Multiple atoms put together/ diff combos of atoms
