Exam 1.1 Flashcards
(30 cards)
Law of Concervation of mass
Mass of the reactants (left side of equation) = Mass of the products (right side of the equation)
Homegenus
Ex. Sweet tea, perfume, saltwater
A mixture that is uniform in its properties; also called a solution
Heterogenous
A mixture that consists of physically distinct parts, each with different properties.
Ex. Salt and iron filings
Trail Mix
Lucky Charms
Oil and Vinegar
Physical change
A change in the form of matter but not in its chemical identity
For example, melting and dissolving
Chemical change
A change in which one or more kinds of matter are transformed into a new kind of matter or several new kinds of matter
Example – Rusting, burning, explosion
Law of definite proportions
A pure compound, regardless of its source, always contains constant proportions of the elements by mass.
Precision
The closeness of the set of values obtained from repeated measurement of the same quantity
Accuracy
The closeness of a single measurement to its true value
T(k)=
T(c)=
T(f)=
D=
M/V
Kilo
10^3
k
Deci
10^-1
d
Centi
10^-2
c
Milli
10^-3
m
Micro
10^-6
ul
Nano
10^-9
n
pico
10^-12
p
Sig fig rules
1.All digits are significant except zeros at the beginning and the end of the figure
2.Terminal zeros at the right of the decimal point are significant
3.Terminal zeros in a number without a decimal point may or may not be significant.
Sig fig:
1.234
4
Sig fig:
1.034
4
Sig fig:
1.230
4
Sig fig:
0.234
3
