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30 Cards in this Set

  • Front
  • Back
What is a molecule?
When two or mor atoms are joined together in specific shapes
What are the states of matter
liquid -distinct volume, no shape
solid-distinct shape, distinct volume
gas-no fixed volume or shaoe
What is a pure substance?
has distinct properties and doesn't differ from sample to sample
What are elements?
cannot be decomposed into smaller substances, each element is one kind of atom
What are compounds?
composed of two or more elements
What is the law of constant composition?
elemental composition of a pure compound is always the same
How is the composition of a mixture different from a pure substance
it can vary
What is the other term for homogenous mixtures?
solutions
What are physical properties?
can be measured without changing the identitty and the composition of the substances ie color, odor, density, melting point, boiling point, and hardness
what are chemical properties?
describe tthe way a substance may change or react to form other substances ie flammability
How is matter ultimately classified?
elements or compounds
What are intensive properties?
do not depend on the amount of sample being examined
What are extensive properties?
depend on the quantity
What are chemical changes?
Also known as reactions, it is when a substance os transformed into a chemciallly different substance
What are the SI units for mass, Length, time, temp, amount of substance?
kg,m,s,K,mol
How are Kelvins determined?
C+273.15
How many cm are in 1 mL?
1 cubic cm
What is density dependent on?
temp. because most substances change in volume when heated or cooled
what is precision?
measure of how closely individual measurements are to one another
What is accuracy?
refers to how closely measurments are to the correct answer
when are 0s significant?
between non-zero numbers, when there is a decimal place
What do you do with sig figs when multiplying? addition?
result contain same number as fewest sig figs, result goes to fewest decimal places
What is an atom?
smallest particle that retain the chemical identity
Decribe the relationship between particles with charges?
same charge repel, opposite attract
What does the atomic mass tell us?
number of protons plus neutrons (top)
What does the atomic number tell us?
how many protons
what are isotopes?
atoms wiwht identical atomic numbers, but different masses
What are groups?
vertical columns
What happens when two elements are in the same group?
exhibit similarities in physical and chemcial properties
What are characteristics of metals?
all solid except Hg at room temp, conduct electricity