test 1 review Flashcards
pure substances are
elements/compounds
element
Pure substances/ made up of one atom
mixtures:
2 compounds or elements physically put together
compound:
2 or more elements that are physically combined
solid
definite shape/ volume
liquid
change shape but definite volume
gas
indefinite shape/volume
homogeneous
same throughout
matter
has mass and takes up space
heterogeneous
can pick out parts
properties
the characteristics that give substances its unique identity
chemical properties
things that show a substance is chaning into another substance
EX: flammability, corrosiveness, reactivity with acids/water,
physical properties
can be observed without changing the substance
EX: color, melting point, density, electrical, brittleness, taste, smell,
extensive properties
amount of substance
EX: mass, weight
intensive properties
type of substance
EX: color
mass
how much matter something has
combined units
derived units
density
amount of matter that water has
density equasion
mass/ volume
accuracy
how close you are to the true value
precision
repeatability
how many sig figs
513.42
5
how many sig figs
2.005
4
how many sig figs
70000000000
1
0.00740
3
9m to cm
900 cm
14.50 m to cm
1450 cm
8 cm to m
0.08 m
15 kg to grams
- g
145 g to kg
0.145 kg
946 ml to L
0.946 L
43.2 L to mL
43200 mL
54.3 mg to g?
0.0543 g
100 C to K
373 K
34 cm3 to mL
34mL
independent variable
what you change/add
dependent variable
what you measure
control
the thing you don’t change
constants
the variables that have to stay the same
