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AP Chemistry Practice Exam with complete solutions 2024_2025.
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AP Chemistry Practice Exam with complete solutions 2024_2025.
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AP Chemistry Practice Exam withcomplete solutions 2024/2025
If matter is uniform throughout and cannot be separated into other substances by
physical means, it is ___. - ANSWER-either an element or a compound
Which of the following are chemical processes?
I) rusting of a nail
II) freezing of water
III) decomposition of water into hydrogen and oxygen gases
IV) compression of oxygen gas - ANSWER-I and III only
____ refers to how close a measured number is to the true value - ANSWER-
Accuracy
Barium reacts with a polyatomic ion to form a compound with the general formula
Ba3(X)2. What would be the most likely formula for the compound formed
between sodium and the polyatomic ion X? - ANSWER-Na3X
The mass % of H in methane (CH4) is ___. - ANSWER-25.13
The reaction between strontium hydroxide and chloric acid produces ___. -
ANSWER-a molecular compound and a strong electrolyte
Oxidation cannot occur without ___. - ANSWER-reduction
The delta E of a system that absorbs 12.4 J of heat and does 4.2 J of work on the
surroundings is ___J. - ANSWER-8.2
The entropy of the universe is ___. - ANSWER-continually increasing
, The energy of a photon of light is ___ proportional to its frequency and ___
proportional to its wavelength. - ANSWER-directly, inversely
The atomic radius of main-group elements generally increases down a group
because ___. - ANSWER-the principal quantum number of the valence orbitals
increases
Which isoelectronic series is correctly arranged in order of increasing radius? -
ANSWER-Ca2+ < K+ < Ar < Cl-
Alkali metals tend to be more reactive than alkaline earth metals because ___. -
ANSWER-alkali metals have lower ionization energies
Of the elements below, ___ is the least metallic:
Ar
As
Se
P
Si - ANSWER-Ar
Resonance structures differ by ___. - ANSWER-placement of electrons only
A real gas will behave most like an ideal gas under conditions of ___. - ANSWER--
high temperature and low pressure
- STP
When NaCl dissolves in water, aqueous Na+ and Cl- ions result. The force of
attraction that exists between Na+ and H2O is called ____ interaction. - ANSWER-
ion-dipole
Elemental iodine (I2) is a solid at room temperature. What is the major attractive
force that exists among different I2 molecules in the solid? - ANSWER-London
dispersion forces
What intermolecular force is responsible for the fact that ice is less dense than
liquid water? - ANSWER-hydrogen bonding
What intermolecular force holds together the 2 strands of DNA and is also
important for the secondary and tertiary structure of proteins? - ANSWER-
hydrogen bonding
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