Exam (elaborations)
Pre-AP Chemistry_ Midterm
Pre-AP Chemistry_ Midterm
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Pre-AP Chemistry: MidtermStates of Matter (behavior of particles) - correct answer-solid - tightly compact
liquid - less compact, not completely fluid
gas - extremely fluid
Physical and Chemical Properties/Change - correct answer-physical change - change in a
substance that does not involve a change in the identity of the substance
chemical property - relates to a substance's ability to undergo changes that transform it into
different substances
chemical change - change in which one or more substances are converted into different
substances
Units of Measurements - correct answer-K H Da U D C M
Significant Figures - correct answer-Zeros between nonzero digits = significant
Zeros in front of nonzeros = not significant
Zeros at end of number and to the right of a decimal point = significant
Zeros at end of number but left of decimal not measured or estimated = not significant
Zeros at end of number but left of decimal, act as placeholder = significant
Historical Development of Model of Atom (scientists) - correct answer-Planck 1900:
suggested that the object emits energy in small, specific amounts - Quanta
E = hv
Einstein 1905: introduced the radical that electromagnetic radiation has a dual wave-particle
nature
Bohr 1913: when electrons change orbits they emit quantum of discrete energy
DeBroglie 1924: particles of matter also had wavelengths and could behave as waves, just
as photons did
Heisenberg 1926: states that it is impossible to determine both the position and the velocity
of an electron or any other particle
Schrodinger 1927: consisted of a dense nucleus surrounded by a cloud of electrons at
various levels in orbitals
accuracy - correct answer-closeness of measurements to the correct or accepted value of
quantity measured
precision - correct answer-closeness of a set of measurements of the same way
Types of Mixture and Method of Separation - correct answer-homogenous
heterogeneous
some can be separated by filtration or vaporized
mixture - correct answer-blend of two or more kinds of matter, each of which retains its own
identity and properties
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